aluminum powder product

Is generally used H&X white fused alumina supplier, kaolin, clay or other material containing Al2O3 in an amount of carbon added, then heated to 1300 ~ 1500 ℃ in a nitrogen atmosphere, the product was obtained Si3N4. Which nitrogen used must ensure that no oxygen. Silica fume on the direct nitridation nitrogen, ammonia or hydrogen nitrogen gas mixture heated to 1200 ~ 1450 ℃ direct nitriding system. The reaction can be prepared with a high content of α original H&X Sic Refractory powder 1200 ~ 1300 ℃, high strength sintered ceramic. Reduction of silica to silicon dioxide, silicon nitride, nitrogen and carbon as the raw material preparation, the following reaction formula. The silica (or TEOS hydrolysis of silica) mixed with a certain proportion of carbon, nitrogen gas was heated to 1400 ℃ nitride 24h.

The main varieties of garnet

The main species
Purple teeth black deposits in a H&X Carborundum Abrasives of native , mainly produced in many magmatic or metamorphic rocks , the majority of gem garnet found in alluvial placer . Purple teeth black garnet group minerals , chemical composition is more complex silicate minerals ( island silicates ) , usually A3B2 [SiO4] 3 said . Where A represents Ca2 +, Mg2 +, Fe2 +, Mn2 + and other divalent cations , B represents Al3 +, Fe3 +, Cr3 + and other trivalent cations . Crystal morphology was rhombic dodecahedron , or both H&X garnet sand three octahedral poly shape. Granular or massive aggregates . Affected by the composition of the garnet color , showing a variety of colors , which include red red series ' Pink ' purple ' orange ; yellow line includes yellow ' orange ' dense yellow' brownish yellow ; green line includes green ' olive ' yellow and green . Crystal display glass glossy surface , sub- adamantine luster , fracture noticeable oil sheen . Transparent to translucent . Homogeneous body , does not have pleochroism , no birefringence . Garnet can be divided into two series , six main varieties : almandine series ( pyrope , almandine , spessartine ) and andradite series ( uvarovite , grossular , andradite ) .

The crystal structure of garnet

garnets is a generic formula X3Y2 (SiO4) 3, silicate minerals (Silicate_minerals).
Garnet necklace
Garnet necklace
X where normally bivalent (divalent) of positive ions (Ca, Mg, Fe) occupy , and Y is where is a trivalent cation (Al, Fe, Cr) occupies , with a regular octahedron or the [SiO4] provided tetrahedral framework. Garnet crystal dodecahedron habit (crystal habit) most commonly found, but there is also a common habit recipe three octahedral (trapezohedron) (note here the "recipe three octahedral " in the main mineral literature will be called kite -shaped three-dimensional geometry THH (Deltoidal icositetrahedron)). They crystallize in the isometric crystal system , there are three equal -length axis and perpendicular to each other . garnet suppliers and will not appear cleavage (Cleavage), so when they burst under pressure will produce significant irregular pieces , a powerful natural crystal energy can bring unlimited inspiration and vitality.
On the market so-called " green garnet Bi " and garnet nothing to do , in fact, prehnite . Prehnite not green garnet , two completely different concepts . The grapes on the market take the side of the stone and green garnet , is nothing more than for financial gain . Value Demantoid very expensive diamond bid , the market is extremely rare.

Optical properties of aluminum powder

Aluminium hydroxide by a light color, high- gloss aluminum metal , its smooth surface that reflects visible light, 60% -90% ultraviolet and infrared light , with the object containing aluminum powder paint coating , the surface of silver white light , this is the aluminum light reflection characteristics.
" Color effect" characteristic of aluminum powder
Since aluminum has a metallic luster and a characteristic to be coated parallel to, a vector containing a transparent pigment , a change in the gloss and color shades with aluminum angle of incidence of the incident light and the viewing angle of the light and color change , such feature is called " two-tone effect ." Aluminum in the coating film are arranged at different levels , when the incident light is irradiated to the layers of aluminum flakes , because by passing through the film thickness of the different type of weakening of the light reflected brightness is obviously different . When the inner light into the white fused alumina suppliers -containing layer and a transparent pigment , the pigment particles become incident through the colored light , and then after reflected different levels of aluminum , light metal , and a hue change will occur , and the viewing angle of the incident light gradual angle from the vertical position to move through the different light color and the number of particles of different particle sizes of aluminum , the hue of light reflected light can occur and the metal endless changes . This feature aluminum has been widely used in the paint, as hammer paint or metallic paint .
Floating aluminum powder characteristics
Pigment with a large variety of aluminum and aluminum paste is floating type , which is characterized by scaly film floating on the surface .
5 Application
Applications
Because aluminum has a silver-white metallic luster, so called aluminum silver or silver , its chemical composition is indeed " aluminum" , not " silver ." Applications: powder coating , ink, plastic masterbatch , printing, paper imitation gold , imitation Gold, gold film , textiles, but the use of water-based paints and paint with a pH of oxidized black. Not recommended for applications requiring a combination of acid rain and the occasion .

Detailed aluminum powder

Aluminium hydroxide powder, commonly known as " silver " , i.e., the silver metallic pigments , a small amount of lubricant is added to pure aluminum foil , crushed by ramming Chance squamous powder , and then polishing is made . Aluminum is light, floating force, hiding power, light and heat reflective properties are good . After treatment, can also become a non -leafing aluminum . Aluminum can be used to identify fingerprints , you can also do the fireworks . Due to extensive use of aluminum , the demand for large , multi-species , it is a large class of metallic pigments .
1 Introduction
Chemical Formula : Al
Product Name : Aluminum
CAS NO :7429-90-5
MW: 26.9815
EC NO :231-072-3
InChI: InChI = 1/Al
Aluminum
Alumina Oxide
A physical and chemical properties and uses odorless. Silver-white metal powder , self-ignition temperature : 5900 ℃, dust explosion limit : 40g/m3. Used to make : paint, ink, paint and fireworks , also used as an additive porous concrete. Aluminum is also used as treatment and medical supplies , in addition to automotive and aircraft industries.
Two toxicity of the product is non-toxic to the respiratory tract induced pulmonary fibrosis. Maximum allowable concentration : 4mg/m3
Three short-term effects of exposure Inhalation : High concentrations of dust may irritate the respiratory mucosa . Eye contact: tiny dust particles generally no stimulation, a large dust particles will be some friction irritation. Oral: in the workplace without normal access to oral dose toxicity . Dust is a lot to swallow friction irritation of the stomach .
Four long- term effects of exposure or repeated exposure causes lung tissue fibrosis, occurring aluminum pneumoconiosis, symptoms include : cough , shortness of breath , loss of appetite, lethargy. Similar to asthma symptoms had appeared.
Five of the fire and explosion of combustible chemicals , powder and air can form explosive mixtures . Isolate the source of fire and let it burn . With sand, talc , sodium chloride to extinguish a small fire. Absolute ban on water.
Six chemical reactivity untouchable acid or alkali. A lot of dust will naturally generate heat when wet. Aluminum and other metal oxide mixture in a fire occurs violent reaction or fire. Mixed with halogen elements will fire. And halogenated hydrocarbons, heat or friction will react explosively .
Seven personal protective Inhalation : If dust concentration is unknown or exceed the exposure limit should wear dust masks Ⅰ level . Skin : To prevent excessive dust deposition or friction , the use of gloves, coveralls , work shoes . Eyes : Wear chemical safety glasses.

Brown fused alumina major functions

Brown fused alumina with high temperature resistance, corrosion resistance, high strength, such as performance, so use casting steel slide gate, and special alloy smelting rare metals, ceramics, blast furnace lining; Physical and chemical vessels, spark plugs, heat-resistant oxidation coating; Corundum heat preservation material, which are widely used in all kinds of high temperature furnaces furnace wall and furnace top, high temperature resistant and heat preservation.
Brown Corundums sand particle size is by the artificial corundum block, using the equipment such as roller, ball mill, the mark, it is mainly used for polishing, grinding, grinding industry, etc., can also according to customer requirements for water washing, acid pickling treatment methods such as processing, able to meet the different needs of customers.

Purifying quartz sand - chemical method

Quartz purification chemical method is mainly acid leaching method and the complex legal, acid leaching method is to use quartz insoluble in acid (except for HF) and other impurities minerals can be the characteristics of the acid dissolution, which can realize further purification of quartz. Ways is to use quartz powder after pickling, acid and can form a coordination compound and the impurity ions in solution, further to remove the impurity ions in solution.Acid leaching method is divided into single acid leaching method and mixed acid leaching method. Acid leaching is often? With acid with sulfuric acid, Aluminium hydroxideacid, nitric acid and hydrofluoric acid. Complexation is often with acids mainly oxalic acid and acetic acid (more)Crusher andKunming crusher technical details please visit kunming kunming andKun ding ChongJi beneficiation plant network). The acids of metal impurity in quartz mineral has a better removal effect. Various dilute acid on Pe and A1 removal effect is obvious, and the removal is the main use of Ti and Cr relatively concentrated sulfuric acid, hydrofluoric acid and aqua regia. The main factors influencing the effect of acid treatment is acid concentration, temperature, time and washing process, etc. 2.1 single acid leaching method to put a certain amount of quartz sand in a certain concentration of acid solution, heated to a certain temperature, heating time appropriately, the acid solution recycling, quartz sand after washing and drying. Somewhere in sichuan containing silty clayey diatomite l 'oJ, using sulfuric acid as acid infusion, by means of temperature, concentration of sulfuric acid and the study of liquid-solid ratio, it is concluded that when the temperature is 90 ℃, sulfuric acid concentration was 40%, the liquid-solid ratio of 10:1, the leaching rate of diatomite railway, best Fe20, decreased from 3% to 3% to 3%, and the content of A1203 content also decreased from 9.55% to 9.55%, and the diatomite in the SiO: content rise to more than 80%. Zhou Yongheng on acid leaching of quartz purification experiment study, through to the hydrofluoric acid pickling temperature, concentration, time of the study, the results show that when the raw material for vein quartz powder in the temperature of 120 ℃, HF, and the proportion of water in a solution of 0.4-0.5 0.5 6 h acid leaching, the purity can be reached the standard of high-grade quartz glass. 2.2 mixed acid leaching methodBecause each kind of effect of removal of impurities of quartz sand is different, different acid mixed together, produce synergies, impurity removal rate higher in the quartz sand, can obtain higher purity quartz sand. Will be washed after quartz sand to join the acid mixture, at room temperature, agitation leaching, clearance generally time for 24 h, if under the condition of heating, using agitation leaching, time is usually 2-6 h, washing dry can. Zhang Chang use at room temperature, such as 18% hydrochloric acid and silicon powder 1.5:1 the liquid-solid ratio, then with 25% sulfuric acid, sulfuric acid and silicon powder liquid-solid ratio of 2:1 in second acid leaching, acid leaching time were used in the 12 h, after two times of acid leaching purification treatment of micro silicon powder fe content < 60 ug/g. Washing of the quartz sand by 20% - 80% of the solid mass fraction with the slurry release containers of mechanical agitator, then add in hydrochloric acid solution (1% 10%) and fluorosilicic acid solution (1% 10%), quartz sand and solution in 75-100 'C temperature mixing 2 to 3 h, and then remove the slurry solution, washing with water several times, until cleaning solution pH value is close to neutral. Use this method to deal with, can reduce the iron content of quartz sand from 0.0059% to 0.0059% - 0.005%. Shen Jiu proportion of mixed acid used for sulfuric acid, hydrochloric acid, nitric acid, hydrofluoric acid 50% : 25% : 15% : 10%, heated to 80 ℃, the concentration of the leaching pulp is 50% - 55%, the content of the silica and iron impurity content reached the standard of high purity quartz sand (SiO2 99.98% or higher, Fe2O3 0.001% or less). 2.3 complex legal ways is a kind of medium strength of organic acids, react with impurities on the surface of the quartz silica sand, and also with the reaction of impurity ions to form stable coordination compounds, and reduces the concentration of impurity ions on the surface of the particles, as well as prevent ion precipitation in the process of washing, further reduce the impurity content in the quartz sand. Panias etc., 120, the average particle size of 20 LTM iron content is 110 x10 ° of quartz sand, said take a certain amount in oxalic acid solution, under heated to 80 ℃, the processing time is 3 h, can dissolve including iron ore, in acidic solution can only exist in the form of Fe3 ', Fe3 + again with oxalic acid to form stable chelate, the iron removal rate between 80% and 100%, after processing, iron content in the quartz sand below 10 x10 ~. - Hunan province LiuYangShi quartz sand, after dealing with the oxalic acid, the sample of SiO2 content increased from 98.26% to 98.26%, A1203 decreased from 0.18% to 0.18%, and the content of Fe203 content reduced to 0.10%. Acid used in the above are available evaporation, condensation, or other methods to achieve the purpose of regeneration and reuse. When Si02 require high purity, acid cleaning of water must be distilled water or deionized water, avoid tap water contains impurities such as iron cause pollution to the high purity Si02.

Corundum grinding stone have what effect

 Brown Corundums grinding stone for: bicycle, aluminum die casting, zinc die casting, furniture hardware accessories, clothing hardware accessories, luggage hardware accessories, eyewear accessories, accessories, locks, electronic accessories, all kinds of jewelry, jewelry, and powder metallurgy, resin, etc. Dongguan widely suggested corundum grinding stone on the stainless steel, iron, copper, zinc, brown fused alumina, magnesium alloy material such as stamping, die-casting, casting, forging, For wire rod, ceramics, jade, coral, synthetic resin, plastic, porcelain and other material items are all in different cutting and polishing effect, about parts normal chamfering, remove burrs, derusting, coarse grinding, and other issues

What are the methods of making corundum

Corundum structure is very special, and general usage of corundum is different, following a brief introduction about the purpose of corundum .
Corundum high quality bauxite as raw material, anthracite , iron Xiao , in the arc melting temperatures above 2000 degrees by made ??by shaping from the mill grinding , magnetic separation to iron , sieving into a variety of particle size , its dense texture , hardness high formation of spherical particles , for the manufacture of ceramic , resin high abrasive and grinding, polishing , sandblasting, precision casting , etc., can also be used to manufacture advanced refractories .
Corundum with high purity, good crystalline liquidity, low coefficient of linear expansion , corrosion-resistant characteristics. After dozens of proven refractory manufacturer , the product in the application process has not detonate , not powder, not crack characteristics. In particular, its price is much higher than conventional corundum , and more to become the best corundum refractory aggregate and filler.
Particle size in accordance with international standards and national standards of production, processing granularity according to user requirements . General size number of F4 ~ F320, depending on its chemical composition and different particle sizes . Prominent feature is the small crystal size , impact resistance, due to a self- processing mill broken particles are mostly spherical particles , corundum with high purity, dense texture , bulk density, self-sharpening strength , good toughness, magnetic material Features ultra-low levels , with its made of abrasive grinding sharp , low fever , grinding ratio .

Corundum and corundum abrasives

By fused corundum sand to produce high-quality bauxite corundum, and used to produce high-quality aluminate powder corundum and corundum. Their natural crystal structure of its high hardness, fast cutting performance. And they are often used as bonded abrasives and coated abrasives raw materials.
Corundum can be recycled many times, cycle times and material grade and the specific processes related to most standard abrasive blasting equipment can be used.
Corundum (aluminum oxide) for a variety of wet and dry treatment process, the workpiece can be any rough surface fine polished, is one of the most affordable abrasive. Such a sharp abrasive synthetic water chestnut has a hardness second only to diamond, iron particularly suitable for use when there are strict requirements pollution. It is used for the rough cutting can also be made to precise dimensions pebble-shaped workpiece is processed to achieve a very low roughness. Due to its high density, sharpness, water chestnut structure, so it is currently one of the fastest cutting abrasive.
Applicable to industrial range: aerospace, automotive, consumer products, casting / die casting, OEM distributors, semiconductor industry and other different fields.
Applicable range of technology: surface plating, painting, glazing and coating Teflon pretreatment; aluminum and alloy products deburring, go to boiler scale; mold cleaning; Metal Blast pretreatment; dry and wet ; precision optical refraction; minerals, metals, glass and crystal grinding; glass sculpture and paint additives.

Silicon carbide and corundum abrasives on the characteristics and performance description

1, brown fused alumina:The main chemical composition AL2O3, the bauxite, iron and anthracite from melting in an electric arc furnace. Corundum abrasive color is brown, its color, the name corundum. The abrasive has a certain hardness and toughness, with the strong grinding ability, able to withstand great pressure. With a high temperature, anti-oxidation, anti-corrosion and chemical stability is good. High tensile strength as it applies to the grinding of the material tensile strength, suitable for general steel, high carbon steel, alloy steel, for the processing of hard wood, other abrasives can be used in substitution is insufficient, a universal Abrasive said, is the most widely used kind of abrasive.2, corundum:The main chemical composition of AL3O2 aluminum oxide powder as raw material in electric arc furnace melting together. Color is white, in terms of its color name corundum. Corundum corundum texture purer than brown. Using aluminum oxide powder material, corundum used by the Department of bauxite processing is made in advance, the main physical components (without grinding capacity) by arc melting from the converted. The conversion has strong grinding force.3, black silicon carbide:The main chemical composition of SiC. From petroleum coke, quartz sand, sawdust as raw materials in the resistor formed by the melting furnace. Black silicon carbide color is black, in terms of its color, named for the black silicon carbide. Black silicon carbide is brittle texture than corundum abrasive, hardness hard, its toughness is also inferior to corundum abrasive, than the end of the tensile strength of the material, such as non-metallic materials (various boards such as wooden plywood, particleboard, high school low-density fiberboard , bamboo board, calcium silicate board, leather, glass, ceramics, stone, etc.) and non-ferrous metals (aluminum, copper, lead) and other materials processing is particularly suitable for hard and brittle materials texture is ideal abrasive machining .4, green silicon carbide:The main chemical composition of SiC used in the manufacture of raw materials such as black silicon carbide plus industrial salt production are substantially the same as the reaction agent and accelerator reaction from the resistance furnace. Terms of their color is green so named for the green silicon carbide . green silicon carbide texture than the more pure black, green silicon carbide powder can be made, even higher hardness than black silicon carbide and silicon carbide which uses the same ground outside is more suitable for fine grinding of materials such as grinding thread, measuring tools, etc. in the grinding mill material is more widely used carbide, diamond products of the workpiece. Because green silicon carbide in the manufacturing cost is higher than the black silicon carbide, such as the use of raw materials is not the same on the ratio, plus a salt auxiliary materials as well as differences in processing power and so on, so green silicon carbide products cheaper than Black silicon carbide is higher. Therefore, the selection of green silicon carbide and silicon carbide in comparison, in the non-metallic and non-ferrous materials generally do not use green silicon carbide, green silicon carbide as the main choice and precision grinding carbide grinding, in belt and other coated abrasives green silicon carbide as grinding on the selection of materials for less.5, microcrystalline corundum:The main chemical components of AL2O3, used the same raw materials and corundum, only in the smelting process using rapid cooling process fine crystals obtained results. Fine crystalline corundum corundum mechanical strength than ordinary higher. Made with microcrystalline corundum abrasives commonly used for coarse grinding steel, high toughness titanium-nickel alloy steel and other difficult to grind materials, but rarely used in the manufacture of coated abrasives.

 

Five use of corundum

Corundum has the following five main scope of use
1 free grinding - grinding grade abrasives used in kinescope, optical glass, silicon, lenses, clocks, glass, crystal glass, jade and other areas of freedom ground, is commonly used advanced abrasive materials.
(2) Sandblasting corundum - blasting abrasive hardness, high packing density, no free silica, heavy, good toughness, Okay corundum is the ideal "green" blasting material, widely used in aluminum , copper profile glass, washed jeans precision molds and other fields.
3 Resin Abrasives - Abrasives has the right color, hardness, toughness, suitable particle cross-section type and edge retention, resin abrasive used, the results are satisfactory.
4 filter media - is a new type of abrasive applications, the use of particulate abrasive medium as the bottom of the filter bed, to purify drinking water or waste water, is home to a new water filtration material, particularly suitable for non-ferrous metal processing: oil drilling mud weighting agent .
5 corundum functional filler - mainly used for automobile brake parts, specialty tires, specialty building products in areas such as construction of motorways. Airstrip. Pier. Parking. Industrial floor. Stadium and other wear-resistant materials .

 

Benefits and use of corundum

Corundum benefits: a high temperature, corrosion resistance, high strength and other properties, it poured with steel sliding gate, smelting rare metals, special alloys, ceramics, blast furnace lining (walls and tubes); chemical containers, spark plugs, anti- Thermal oxidation coating.
1, corundum is called dental industry: mainly used in the refractory, grinding wheels, sand blasting.
Sandblasting corundum - blasting abrasive hardness, high packing density, no free silica, heavy, good toughness, Okay corundum is the ideal "green" blasting material, widely used in aluminum, copper profiles of glass, washed jeans precision molds and other fields;
2, free grinding - grinding grade abrasives used in kinescope, optical glass, silicon, lenses, clocks, glass, crystal glass, jade and other areas of freedom ground, is commonly used advanced abrasive material;
3, resin abrasive - Abrasive have the right color, hardness, toughness, suitable particle section types and edge retention, resin abrasive used, the results are satisfactory;
4, Coated Abrasives - Abrasive sandpaper, gauze and other manufacturers of raw materials;
5, corundum functional filler - mainly used for automobile brake parts, specialty tires, specialty building products in areas such as construction of motorways, runways, terminals, parking lots, industrial flooring, sports and other wear-resistant materials ;
6, the filter media - is a new type of abrasive applications, the use of particulate abrasive medium as the bottom of the filter bed, to purify drinking water or waste water, is home to a new water filtration material, especially for non-ferrous metal processing, oil drilling mud weighting agent :
7, abrasive water-jet cutting - is abrasive cutting media, relying on high-pressure water jet cutting basic, used in oil (gas) pipelines, steel and other components of the cutting, is a new, environmentally friendly, safe cutting.
Customers: washing plant denim sandblasting workshop shipyard shipyard steel plant powder factory Shalun sandpaper, emery cloth factory floor crystal glass industry building industry, steel industry, metal industry, electronics industry, Qi car manufacturing docks, parking Hospital Stadium. Spray sands industry and other cooperation to meet various user needs in aggregate and abrasive floor.

A few easy and studious garnet identification methods

1.garnet color super-brilliant super-transparent, if the price is cheap, the majority have a problem, because they are cheap suffer a great deal.
2.See batt impurities, garnet inside easily with black spots, ice crack.
3.Garnet heavier than the average crystal, hold in your hands weigh lighter than powder, it is necessary to doubt.
4.Garnet delicate, feel very slippery surface, feels quite comfortable and oil feeling to not powder "glass" feeling.
How to identify garnet is good or bad:
Garnet color from several aspects as:
1.the lighter the color the better. Garnet crystal born color than other heavy and hard to come by, so light color. Kind of a read talk like black fineness worst.
2.as transparent as possible. Any crystals are like this, so we must not be the language of the unscrupulous businessmen deceived.
3.Binglie as little as possible. Any crystal.
4.based on the garnet Price from low to high is divided into three color: purple, rosy red, burgundy.