What is mainly used for the production of Brown Corundum

Corundum functional filler - mainly used for automobile brake parts, special tires , specialty H&X fused silica products in areas such as construction of motorways , runways , terminals , parking lots, industrial flooring , sports and other wear-resistant materials ;
1 filter media - is a new field of application of the abrasive , particulate abrasive for use in the bottom of the filter media bed , the purification of drinking water or waste water , is a new type of domestic water filter material, especially for non-ferrous ore , oil drilling mud H&X sil agent :
2 abrasive water-jet cutting - is abrasive cutting media , relying on basic high-pressure water jet cutting, used in oil ( gas ) pipelines, cutting steel and other components , is a new , environmentally friendly, safe cutting . Customers: washing plant denim sandblasting workshop shipyard shipyard steel plant powder factory Grinding Wheel sandpaper, emery cloth factory floor crystal glass industry, construction industry, steel industry, metal industry, electronics manufacturing car with coastal terminals, parking Hospital Stadium spray . sands industry to meet all types of users , such as co- Ping required to aggregate and abrasive .
Products and reliable, stable performance , high quality, easy to use.

Full description of the alumina production process

A comprehensive introduction to the basic theory, techniques and new technologies and sintering Bayer alumina production, review and summarize the results of a new study in the field of aluminum, according to China's bauxite resources, put forward the sustainable development of China's aluminum industry direction.
The main contents include: the H&X silicon carbide grit of China's development in the world and our bauxite and alumina industry resources; sodium aluminate solution properties, Bayer and sintering of alumina production principles and processes; affect Bayer alumina dissolution process, red mud settling performance, seed decomposition H&X silica sand, the evaporation process and the factors and processes aluminum hydroxide roasting process optimization; sintering clinker, clinker leaching, and sodium aluminate solution desilication carbonation decomposition techniques; China's alumina industry in the direction of sustainable development; development and application of Bayer alumina production method and sintering the latest technology.

Furnace with rails and monolithic refractories

Unshaped refractories having a particle size gradation of the aggregate and the Sic Refractory powder, a binder, a refractory mixture of additives, also known as bulk refractories. Equipment for thermal lining, without firing process, the direct use baking. With firebrick, compared with a simple process (due to eliminating the firing process), energy conservation, low cost, ease of construction and other features of mechanization. Use of thermal equipment on some better results than firebrick.
Currently, there is no domestic water-cooled furnace uses a rolling silicon carbide corundum a Calcium silicon, rolling mill furnace taphole platform uses a high alumina ramming mixes. A silicon carbide and high alumina corundum ramming material at high temperature heating of billets contain more silica. Slab surface iron oxide and silica will form the furnace temperature below the melting point of iron olivine, resulting in poor wear resistance of high temperature refractory, low-life, easy slag within the furnace.

Progress of unshaped refractory castable

Introduced a monolithic refractories way to cast construction abrasive material - castable, and according to the author of the latest research findings and new products in recent years about the casting material preparation, application, etc., systematic exposition of coke gem-based castable, bauxite-based castable, mullite-based castable, corundum based castables, magnesia castable, lightweight insulation castable and research progress and performance of acid and alkali resistant castable. On this basis, the development trend castable.
Also known castable Sic Refractory castable: a refractory material joined by a certain amount of granular and powdered materials made ​​binders. With higher liquidity, apply to casting molding way monolithic refractories. Compared with other monolithic refractories, binders and moisture content is higher, better mobility, so a wide range of applications without stereotypes refractories can be used for selection of materials and binders based on conditions of use. Either directly poured into the lining of the body to use, and available method of casting or real shock made ​​use of prefabricated blocks.

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 .

Rare earth application in aluminum construction profiles

1, the rare earth application in aluminum powders construction profiles
In a typical civil construction in 6063 aluminum alloy profiles, add the content of rare earth range with 0.17% ~ 0.25% advisable, too many to join can have adverse effects on various performance instead. Rare earth on the mechanical property of 6063 aluminium alloy, the processing performance had a significant improvement in the function, after deformation profiles tensile strength can be increased by 5% ~ 10%, and hardness increased by 8% or so, elongation is improved. And can reduce rod extrusion temperature and improve extrusion speed. The study also found that after adding the rare earth elements 6063 Alumina Oxides ation coloring, film thickness, film can obviously increase the hardness and gloss, and improved the corrosion of acid, alkali and salt. All in all, 6063 aluminum after adding suitable amount of rare earth, thus refine microstructure, colour and lustre is uniform, beautiful, durable, deeply user welcome.
2, rare earth application in aluminium alloy wire netting
Rare earth aluminium alloy window screening, in strength, corrosion resistance, brightness, drafty, processability and cost, etc., are better than that of the same type without rare earth aluminium alloy wire netting, so for a wide range of applications. AnLiu window screen factory, LuJiang piston factory, for example, such as the production of rare earth aluminium alloy window screening, has been popular at home and abroad.

Rare earth can significantly reduce the inclusion quantity of two reasons

(1) the characteristics of rare earth oxides with high melting point, than the major, the proportion of about 2.5 times higher than pure aluminum powders. The greater the proportion of oxide, in the process of let stand, the more you will sink of inclusions, thus the remnants of the inclusions in aluminum liquid quantity the less;
(2) rare earth to join aluminium alloy liquid, liquid aluminum is smooth, does not like other refining agent boiling violently, secondary oxidation in the melting process, thus incorporated into the regenerative oxidation film (Al2O3) few in number. Deoxidization Sic Refractory of rare earth elements than deoxidizer Al, Mg, Ti, trace rare earth can make [O] strip to < 1 x 10-4%. Rare earth desulfurization ability is strong, can generate RES or RE2S3, products mainly depends on the activity of rare earth with sulfur or solubility. Rare earth elements in the fluid of the metal, also can react with O and S at the same time generate RE2O2S type sulfide. Rare earth elements can also with low melting point metal such As P, Sn, As elements combined, generate REP, RESn, REAs compounds. These rare earth compounds have the characteristics of high melting point, the proportion of light, when they are higher than the melting point of metal smelting temperature, can rise of slag. Their tiny particle becomes aluminum heterogeneous nucleation crystallization process, the removal of impurities in aluminum and its alloys. So, rare earth can make aluminum impurities redistribution, bulky compound glomeration, purification and grain boundary, improve the deformation, plastic processing of aluminum and its alloys.

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.

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.

 

Green foreign polishing process using silicon carbide powder

Polishing process includes: Calibrating grinding, rough grinding, the grinding, fine grinding, polishing, edging and inverted corners and other processes. Abrasives and Abrasive used: Calibrating the above steps except use emery grinding, the rest are made of Green silicon carbide powder fineness ocean. Polishing is required for the cooling flush face to face away produce a lot of heat to prevent the products burst. After polishing needed for drying, waxing or other surface coatings to enhance its dirt capacity, improve the gloss, the current process is mainly used for polishing finishing ceramic tiles, and has developed a fully automatic polishing machine. The flexible abrasive polishing tools and polishing media particles or other modification of the surface of the workpiece processing.
Polishing can not improve the dimensional accuracy of the workpiece or geometric shape accuracy, but to obtain a smooth surface or specular gloss for the purpose, sometimes to eliminate gloss (extinction). Usually as a polishing buff polishing tool. Buff general use multi canvas, felt or leather crafted stacked on both sides with a metal circular plate clamped its rim coated abrasives and grease, etc. from the powder mixture evenly polish. Uniform fine polishing using material degreased thin wood or a special felts, its trajectory uniform dense mesh, the surface roughness after polishing is less than Ra0.01 microns, the enlarged 40 times under the microscope than any surface defects.

Green silicon carbide on the use and what are the characteristics

Green silicon carbide is quartz sand and coke for raw materials as a good thermal conductivity, high hardness of man-made materials. Green silicon carbide, white fused alumina even at high temperatures also have high strength, the elastic modulus when the temperature reaches 1600 ℃, began to decay. At a temperature of 2815 ° C begin to separate, but it does not melt at atmospheric pressure. Green silicon carbide suitable for use as super refractories, is also widely used for grinding areas.
Use
For 3-12 inch monocrystalline silicon, polycrystalline silicon, GaAs, quartz crystal wire cutting. Solar photovoltaic industry, the semiconductor industry, piezoelectric crystal engineering of industrial processing materials.
Feature
1, high-purity, large crystal silicon carbide material, the cutting of silicon carbide powder to ensure excellent cutting performance and stability of the physical condition.
2, plot size and shape of such a front edge, to ensure cutting edge material as silicon carbide powder balanced self-sharpening to ensure the material being cut TTV is minimized.
3, the particle size distribution is narrow and uniform.
4, a high thermal shock resistance and load softening temperature, which ensures that the cutting load of the small coefficient of linear expansion, thus ensuring the stability of the cutting; cutting machines and able to have a good adaptation of.
5, the surface is specially treated, powder with a large specific surface area and clean appearance, and polyethylene glycol coolant has good suitability.

 

Green silicon carbide wheel Precautions during use

Side grinding problem grinders everyday use, we often find that some operators, regardless of the type of grinding machine, regardless of the type of wheel, casually on the side of the grinding wheel to use, this is a serious breach of security operations Statutes illegal operation behavior.
Procedures used by the peripheral surface should not be used to do the side face of the grinding wheel, this wheel radial strength greater axial strength is small, the operator excessive force will cause wheel broken, even wounding, in the actual The use of the process should prohibit such behavior.
Positive operational problems in daily use, many operators facing the wheel always used to operate because this direction can be put into effect, in fact, this behavior is grinding machine operation should specifically prohibited behavior.
Follow the rules, use the grinder grinding the workpiece, the operator should stand on the side of the wheel, the front wheel must not be operated in order to avoid wheel faulty, or the wheel broken wheel flying flying out.
Force operating problems when used in a grinding machine, some operations, especially the younger operators, for the sake of grinding speed, excessive force is too large, which is a very unsafe behavior. Any wheel flat body has a certain intensity, doing so may cause the wheel broken, and even flying out, but also a should be prohibited.
Common operational problems in the actual daily operations, there are also so happens, someone rush production tasks, grab the working time, the two share a grinding machine simultaneously, which is a serious violation operational behavior, should be strictly prohibited. A grinder is not enough time, can be used to add grinders solution, and definitely not at the same time share a grinder.