Alumina Refractory

Bauxite (aluminous soil; bauxite), also known as alumina or bauxite, main ingredients are aluminum oxide, hydrate alumina containing impurities, is an earthy mineral. White or grey, brown yellow or light red by iron. From 4 to 3.9 g/cm3 density, hardness, H&X silicon carbide abrasive powder, opaque, very brittle. Very difficult to melt. Insoluble in water, soluble in sulfuric acid, sodium hydroxide solution. Mainly used for aluminium, refractory material.
Main ingredients
The scientific name bauxite bauxite, bauxite. Its composition is extremely complex, a variety of geological sources vary the floorboard of the hydrous alumina ore. As water soft LvShi, hard LvShi monohydrate and sanshui LvShi (Al2O3 · 3 h2o); Have a plenty of diaspore and kaolinite (2 sio2, Al2O3, 2 h2o) company; Some is given H&X Alumina Oxide to with kaolinite, and with higher content of kaolinite, the form for general bauxite or kaolinite clay. Bauxite is generally formed by the chemical weathering or exogenous, there are few pure mineral, mineral always contains some impurities, more or less contain clay minerals, iron ore, titanium minerals and clastic heavy minerals and so on.
Bauxite definition names is not enough unity, this is related to resources from all countries and industrial demand. Name of various periods are inconsistent, but basically the same. In China it is generally believed: "bauxite refers to the aluminum content of ore is higher (40%), al-si ratio (A/S (2.5 or higher) is greater than 2.5, which is less than the numerical value is called clay or shale or aluminum bauxite rock". In China's proven reserves of bauxite, LvShiXing monohydrate bauxite accounts for about 98% of the country's total reserves.

Widely used silicon carbide refractories

 The main raw material used for the production of silicon carbide batts, laminectomy, brackets, sagger muffle boards, in addition to H&X silicon carbide grit with high strength, hardness and other inherent characteristics, but also with high load softening point, heat quickly, antioxidant , shrinkage deformation at high temperatures is not easy, and long service life. Regardless of the product (gas, coal, oil,electricity) which has a bend deformation can H&X Al2O3 powder at high temperatures, does not swell off the slag, fine features and strong thermal radiation, widely praised by users. Our factory uses advanced hydraulic vibration molding equipment, molding, unique formula, advanced technology, praised by users.
Alumina, the main raw material for the production of alumina wear-resistant ceramic lining brick, patch; wear-resistant ceramic pipe, elbow; wear-resistant ceramic lining, etc., are widely used in papermaking, power plants, chemical industry, metallurgy, mining equipment and other industries, after the majority of users use proven product quality, is the ideal replacement for other materials.

Modulation of alumina cement refractory castable development

Abstract: The development of Sic Refractory containing fine particles are added to the agent alumina cement castable modulation. Agent is used to join aluminum thermal decomposition of ferrochrome from slag and high alumina screenings. Such castable studied the physical and mechanical properties and thermal properties.
Spinel is magnesium Alumina Oxides spinel mineral composition, because it contains magnesium, iron, zinc, manganese, etc. elements, which can be divided into many kinds, such as aluminum spinel, spinel iron, zinc spinel manganese spinel, chrome spinel. Because it contains different elements, different spinel can have different colors, such as magnesium spinel between red, blue, green, brown or colorless; zinc spinel was dark green; iron spinel black and so on. Spinel octahedral form or glassy hard particles and lumps. They appear in igneous, metamorphic and granitic pegmatite limestone. Some pretty transparent and color as spinel stones, some as magnetic iron. Using artificial methods already create over 200 varieties of spinel.

With alkali castable SiC amount of cement kiln

Different binders for Sic Refractory Abstract: waste ceramic powder, Guangxi white clay, silicon carbide, silicon powder as the main raw material, calcium aluminate cement as binding agents, add water and alkali configured castable. By adjusting the amount of added silicon carbide, silicon carbide impact study alkali castable and alkali erosion mechanism castable. The results show that: with the addition of calcium silicons increased sample volume density, compressive strength and flexural strength increased first and decreased sample surface oxidized layer of dense oxide film to prevent the erosion of alkali vapors when add 6% -8% of silicon carbide, alkali grade samples reached level, alkali erosion capacity increased significantly.
Category Industrial Technology> Chemical Industry> Portland Industrial> Industrial Refractories> Refractory Products> unshaped refractories
Keywords SiC Alkali castable

Effect of different binders on the rheological properties of monolithic refractories

calcium silicon: unshaped refractory binder definition and classification , introduced the use and application of the principles of various monolithic refractories binder , a detailed analysis of the different binding agents on the rheological properties of monolithic refractories , and analyzes the application status and future trends unshaped refractory binders discussed.
Category Industrial Technology > Chemical Industry > Portland Industrial > Industrial Refractories > Refractory Products > unshaped Sic Refractory
Keywords unshaped refractory binder rheology
About binder binding agent is a combination of various types of abrasive bonding agents and abrasive materials . Bonded Abrasives usually ceramic , resin, rubber, magnesite four categories binders . Binding agents can be divided into inorganic binder and organic binder . Superhard abrasive material constituting the binder resin is a thermosetting resin as a binder with a variety of fillers , the nature and amount of the number of the various components of the binding agent on the physical properties , mechanical properties and grinding performance have a great impact .

Develop countermeasures and suggestions magnesia refractories

magnesite refractory to magnesite, seawater magnesite and dolomite as raw materials, mainly periclase crystal phase , magnesium Alumina Oxide content of more than 80% of the refractories. Belong to basic refractories . Its products can be divided into metallurgical magnesia and magnesia products into two categories. Depending on the chemical composition and metallurgical purposes can be divided into magnesia brick, silica brick magnesium , magnesium aluminum bricks, magnesium , calcium brick, magnesia carbon bricks , and other varieties . Its performance is greatly affected CaO/SiO2 ratio and impurities. The high purity magnesia brick load softening point and thermal shock resistance are much higher than the general magnesia brick as well. High refractoriness of basic slag and iron slag has good resistance , is an important high-grade refractory . Multi magnesia products produced by sintering , the calcination temperature is generally between 1500 ~ 1800 ℃, in addition , chemical binding agents can be added , and the unshaped refractories made ​​of unfired . Mainly used for open-hearth , electric furnace, oxidation converter, nonferrous metal smelting furnaces , cement kilns and kiln calcination basic refractories . Since the main origin of magnesite in southern Liaoning , namely Liaoning Haicheng City , Dashiqiao , Xiuyan County , Phoenix City and other places. So the area is rich in magnesia Sic Refractory materials - magnesia , including sintered magnesia and fused magnesia , is currently the world's richest regions , where there are many companies producing magnesia refractories .
Magnesia refractories production resources be required , and the resource has a comparative advantage . Development of the steel industry, requires a lot of magnesia refractories , magnesia refractories industry therefore has a broad market prospect. Through the planning and layout , strengthen management, implementation of industrial agglomeration, conducted a series of measures such as deep processing industry to promote the development of calcium carbide industry.

Rare earth unique explanation

Rare earth and many of the unique physical and chemical properties to develop the alloy containing rare earth materials. Rare earth is not only a large number of used in military industry, silicon carbide powders, light industry, handicraft industry and transportation industry, also widely used as building materials, appliances and sporting goods such as family life.
The application of rare earth in conductive aluminum alloy, is now widely used in China, high technology is relatively mature, industrial value and economic benefit is good one area. High conductivity of rare earth alloy, usually refers to the pure aluminum, aluminum powder - magnesium - department of silicon and aluminum - magnesium alloy adding rare earth alloy, and aluminum zirconium - yttrium alloys. Mainly used in the manufacture of overhead transmission line, cable, sliding wire, wire core, general wiring, special purpose of fine lines and fine lines, aluminum wire. Its development soon, has risen from 315 V to 500 V on the high tension line, area from dozens to hundreds of was, was by the development of wire and cable and then to the conductive bus. They are at the new products, has become China's conductive aluminum alloy with high strength, large carrying capacity, long service life, wear resistance and easy processing characteristics. At present, more than 20 domestic provinces and cities, factory production of rare earth alloy wire

The role of rare earth in aluminum and its alloy

Rare earth elements is very lively, extremely easily with gas (e.g. hydrogen), non-metallic (such as sulfur) and generate the corresponding stable compound metal effect. The atomic radius of rare earth calcium silicons is less than common metal, such as lead, magnesium, etc., in the solid solubility of these metals is extremely low, almost can't form a solid solution. In the rare earth elements added to the aluminum alloy can have the effect of micro alloying; In addition, it with gas such as hydrogen and many non-metallic strong affinity, can generate high melting point compounds, so it has certain than hydrogen, refining, purification effect; At the same time, the rare earth elements strong chemical activity, it can be selectively on has formed the grain interface adsorption, hinder the growth of the grain, with the result that grain refinement and qualitative change.
metamorphism
Modification Brown Corundums is to point to add a small amount of in metal and alloy or trace of inoculant, to change the alloy crystallization conditions, make its organization and performance improvement process. Metamorphic agent is also called the grain refining agent and nucleating agent. Typically, rare earth atomic radius. Because of rare earth elements is lively, it melt to fill easily in the liquid aluminum alloy phase surface defects, and reduces the surface tension of the old and the new two phase interface, make the crystal nucleus growth rate increased. At the same time it also can between grain and alloy liquid in the formation of surface active membrane, prevent generating of grain growth, thus refine the organization of the alloy. In addition, as an exotic crystal nucleus, aluminum and rare earth compounds in metal crystal formation, due to the large increase in number of crystal nucleus and thus refine the organization of the alloy. Rare earths in al-si alloy is mainly the metamorphism, make needle, lamellar eutectic silicon spherulitic, make less of the scale of the primary silicon. The stale ability is different, different rare earth La and Eu has strong metamorphism, and the mixture of rare earth and Ce only moderate ability of metamorphism. Lanthanide metamorphic ability has a close relationship with atomic radius, as the atomic radius from La to Er of 0.187 nm 0.175 nm, the metamorphic capacity decreases. All in atomic radius is less than 0.18 nm, metamorphism is reduced to the point of no practical significance. Different metamorphic ability of rare earth elements available critical cooling rate of deterioration (Vc), Vc is smaller, the bad effects, the more obvious; When V is smaller than that of Vc, any concentration of rare earth elements can cause alloy, this is one of the main difference between rare earth and other metamorphic agent.

Brown fused alumina, alumina porcelain, high-frequency porcelain, what material is used for grinding the? And other?

Brown fused <a href="https://www.facebook.com/pages/White-fused-alumina/151832528325664">White fused alumina</a>is mainly used in: 1: abrasives 2:3: refractory sandblasting 4: emery wear-resisting floor 5: precision casting mould making.<br />Dongguan  widely suggested is a dedicated to promoting new environmental  protection polishing equipment, grinding materials, additives, such as  hundreds of kinds of product research and development of high and new  technology enterprise, the high frequency porcelain products used in  various types of high-<a href="http://www.hnhxgk.com/key-sic-refractory-240/">Sic Refractory</a>insulator,  porcelain dial section switch axis, porcelain bushing, resistance  matrix and containment shell electron yuan, device, it has high thermal  insulation, good chemical stability and good compressive strength  etc.Grinding stone is indispensable in the process of grinding and  polishing metal processing material. With centrifugal, vibration, eddy  current, rotary, box-type grinding machine. To metal burr, flash, scale,  rusty spot, inverted, rough grind cutting edges and corners

Fused silica refractory

Fused silica refractories and technical equipment for its manufacturing  process compared to other refractory industry is relatively simple, and  compare its performance and relative location, and the cost is low, and  it could get a lot of applications, since we started late in our  manufacturing processes and equipment Western countries is less than  perfect with industry manufacturers, compared with foreign refractory  Sic Refractoryindicators and the results of not less than the level of  similar products, but our products due to processing equipment is not  complete, in appearance, there is a large gap with foreign products,  select performance processing equipment, improve the appearance of the  product, and should be not only external beauty but also inner beauty so  that product quality to the next level.

About emery abrasive categories and methods of use

Metal cutting and abrasive surfaces Shuhei process of the main material . In actual production , the commonly used abrasives are synthetic diamond , corundum , silicon carbide, diatomaceous earth, pumice, quartz sand and so on.
Artificial corundum - with high hardness and toughness small ( compared to other abrasives ) is mainly used for rough grinding and polishing low strength metals ( such as pig iron , brass, bronze, etc. ) polished .
Corundum - There are two man-made and natural . The bauxite corundum Al2O3 content , the more the higher the hardness . Corundum is the use of better materials coarse grinding wheel , than artificial corundum toughness . Corundum particles are multi-faceted , sharp edges of particles than artificial corundum was blunt sharp edges . For polishing and tough and has a large breaking strength metals such as hardened steel , malleable iron, manganese bronze.
Emery - with medium hardness and excellent toughness , applicable to all metal polish .
Diatomaceous earth - with less sharp cutting surface and excellent toughness , repairable flat metal surface scratches and scratches and other defects. It is generic , polishing materials .
Quartz sand - particles with medium hardness , it is not a sharp cutting surface , and its toughness is also very good , the universal grinding and polishing materials .
Pumice - its hardness is poor , but also more crunchy , suitable grinding, polishing wood, leather , rubber, plastic and glass.
According to the above kinds of abrasive nature , summed up in the grinding hard metal products , to use artificial corundum , corundum or emery, then fine emery , pumice, finely ground quartz powder . The polished softer metal products , generally with diatomaceous earth and pumice .

Do you know the role of powder characteristics is

White fused alumina powder as raw material, made ​​of high-temperature melting. White, slightly higher hardness than corundum, lower toughness. With its manufacture of abrasive for high carbon steel, high speed steel and hardened steel grinding. Used as a polishing material, but also for precision sand casting, coating materials, chemical catalyst carrier, precision wear characteristics.
Green silicon carbide with quartz sand and petroleum coke as raw materials, high temperature melting, green translucent crystals, high hardness, cutting ability, suitable for machining hard and brittle materials, such as cemented carbide, high speed steel, and optical glass, ceramics, agate and other non-metallic heating elements, heat originals.

 

What is processing corundum

Corundum is generally polygonal shape diamond , so the colors are white , then in today's society, many people do not know what is corundum , but do not know what effect it has , generally used in the wrong ?
Corundum Scope:
Etching processing: jade, crystal , agate, semi-precious stones , stamps, ornamental stones , antiques, marble gravestone, ceramic, wood , bamboo , etc. etched art .
Pretreatment processing: PTFE (TEFLON), PU, ??rubber, plastic coated , rubber drum (ROLLER), electroplating, metal spray , titanium , etc. Before treatment, the increase in surface adhesion .
Beautification processing: various gold , K gold jewelry, precious metal or of extinction matte , crystal , glass, corrugated , acrylic, and other non-metallic matte processing and enables the workpiece surface into a metallic luster.
Surface processing: metal oxide layer, carbide black , metallic or non-metallic surface dirt rust removal , such as gravity die casting, rubber mold of the oxide or remove agents from the shape , ceramic surface black spots , uranium -color removal , painting rebirth.
Flash processing: bakelite , plastic, zinc, Alumina Refractory,aluminum die-casting products , electronic parts , core , etc. burr removal .
Stress relief processing: aerospace, defense, precision industrial Parts , rust, paint extinction , renovation etc. stress relieving processing.

Black corundum corundum smelting method and the same

(1) A corundum
Corundum is bauxite, coal and iron as raw material in electric arc furnace at high temperature smelting. In the smelting process, the carbon anthracite in the silica alumina, iron oxide and titanium oxide is reduced to metallic impurities, the alloy of these metals taken together, due to its large specific gravity than the molten corundum to the bottom of settlement and corundum melt-liquid separation. Only a small amount of impurity inclusions in the corundum melting fast.
The main ingredients of mineral corundum corundum physics, trigonal system, a small amount of mineral impurities are: calcium silicate, calcium plagioclase, mullite (also known as mullite), titanium compounds, vitreous, and a small amount of iron alloy.
Corundum anti-crushing ability, anti-oxidation, corrosion resistance, good chemical stability, which is a widely used abrasive. Suitable for grinding high tensile strength of the metal materials, such as ordinary carbon steel, hard bronze, alloy steel grinding and grinding, thread and gear grinding, white fused alumina can be used for precision casting and high-grade refractory.
(2) black corundum BA
Black corundum corundum smelting methods and the same is Sanshui bauxite as raw material, add a small amount of reducing agent is made by smelting, its power consumption is about two-thirds of corundum. Black, the main chemical components: Al2O3 not less than 77%, SiO2 content of 10 ~ 12%, Fe2O3 content is 7 ~ 10%, TiO2 is about 3%, the proportion of not less than 3.61.
Black corundum with good self-sharpening, grinding, less heat, better finish machined parts for the bottom part before plating polished, aluminum and stainless steel polishing, can also be used to polish optical glass, processed timber. Due to its hydrophilic, can be used in the manufacture of sandpaper, emery cloth and resin abrasive, but also can be used for polishing paste and polishing powder. Black corundum due to iron content is high, and therefore should not be used in the manufacture of ceramic abrasive.
(3) White corundum WA
White fused alumina powder as raw materials in industry, in the arc by melting temperatures above 2000 degrees and then cooled steel. Aluminum oxide (Al2O3) content of 98%, and a small amount of iron oxide, silicon oxide and other ingredients, white.
Harder than corundum corundum, grit easily broken, sharp edges and corners, good cutting, grinding, heat a small and so on. For hard materials, heat-sensitive strong steel grinding. Such as hardened steel. High carbon steel, general high speed steel, alloy steel grinding. Mainly used for tools, cutting tools, dies, gears, threads, thin-walled parts grinding and profile grinding.