Sic Refractory is silica core

Sic Refractory as a core raw material silicon feedstock plays an irreplaceable role in the production and supply base silicon feedstock. It has the H&X white fused alumina physical and chemical properties, making it occupies a pivotal in aviation, aerospace, electronics, machinery, and the rapid development of today's IT industry position, especially its intrinsic molecular chain structure, crystal shape and lattice variation, it has a high temperature, thermal expansion coefficient is small, highly insulated, corrosion-resistant, the piezoelectric effect, resonance effect and its unique H&X silicon carbide grit properties, making it plays an increasingly important role in many high-tech products, such as, IT industry's core technology products - computer chips, fiber optics, electronics industry resonator, new electric light, highly insulating sealing materials, aerospace equipment, military technology products, special optical glass, chemical analysis equipment, etc., from do not open these basic materials.

Advantages of natural corundum

Natural diamond grinding H&X carbide silicon of slightly less than white corundum furnace, but its self-willed, and has a characteristic shell-like section of the mouth, the advantage of grinding parts finish, sand marks few and shallow. Fine grinding and uniform, to improve product quality, as Emery is unique. Natural diamond grinding time is short, high efficiency, low cost, short life can H&X fused silica manufacturers for the lack.
Natural corundum called garnet, which is the condition of the sky because it's produced, is a silicate mineral. Emery grinding raw materials through a simple process can be divided into several levels, classification and other methods of screening, great hardness, which is about Mohs 7-8 degrees. Usually a brown powder particles. Metals for industrial sandblasting, grinding and other purposes.

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.

Impact SM superplasticizer and zircon refractory castable

Abstract: SM superplasticizer on castable flow values ​​and mechanical properties, as well as adding zircon aluminum powder for refractory castable material impact on the residual thermal shock flexural strength. The results showed that in the test range increases with SM castable flow amount increases, the volume density, reduced porosity, compressive strength, flexural strength increases; Zircon with increasing thermal shock 15 times the residual flexural strength increases first and then decreases.
Brown Corundum Industrial Technology> Chemical Industry> Portland Industrial> Industrial Refractories> Refractory Products> unshaped refractories> castable
Keywords SM superplasticizer zircon refractory castable

Artesian refractory castable microstructure

Abstract: By adding the alumina spinel observed gravity nano-Alumina Oxide refractory castable particles at different temperatures in the microstructure and phase composition, study the physical and mechanical properties. The results show that the addition of nano-alumina material has a significant effect on the gravity refractory castable physical and mechanical properties. With the increase of the castable composition of the nano-alumina particles, the mechanical strength at different temperatures has been greatly improved. This indicates that nano-aluminum powders particles can affect the formation phase after firing. In common sample fired at 1500 ℃ found CA6 flaky crystals are formed on the plate-like alumina and spinel grain boundaries. Nano-alumina particles of the sample was added, in a lower temperature (1,300%) is formed CA6 phase.
[Classification] [Industrial Technology]> Chemical Industry> Portland Industrial> Industrial Refractories> Refractory Products> unshaped refractories> castable
Key words microstructure and mechanical properties Al2O3 spinel refractory

Adding aluminum-magnesium aluminum thermal properties of refractory castable

Summary : Overall the ladle lined with high Alumina Oxides castable aluminum powder can be added to improve its thermal properties, such as heat resistance and resistance to thermal shock resistance burst processing. Other mixtures of water and aluminum powder (magnesium oxide , bauxite cement ) mixing due to the formation H: gas permeability can be formed even cast material after casting vent . Metallic aluminum powder was determined to join the Department of A12O3-MgO castable burst resistance and thermal shock resistance of the research work carried out in the course of the trial . On the whole 300t ladle lined with castable A12O3-MgO conducted several tests, the results showed that the use of such material can improve the thermal casting performance and extend the life of the ladle in the ladle the whole lining.
aluminum 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 .

Development of recycling technology of refractory iron production

Sic Refractory meets the conditions of use of different devices There are many varieties and different quality. From the form of points, there are stereotypes refractories (refractory bricks) and unshaped refractories (casting material, injection materials, etc.). Iron and steel industry is large consumption of large industrial refractories, refractory these limited resources to build a recycling-oriented society, is an increasingly important issue in the future.
Category Industrial Technology> Chemical Industry> Portland Industrial> Industrial Refractories> Refractory Products> sandblasting abrasive refractories
Keywords unshaped refractory recycling technology development and production of iron and steel industry equipment and more varieties of material resources
Engaged in the production of means of social wealth of human activities and processes, including material wealth and spiritual wealth creation and people's own fertility. Also known as social production. Narrow sense refers only to create material wealth producing activities and processes.

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.

Silicon carbide refractories explanation

Studied the clay bonded black silicon carbide refractories performance. SiC sintered at 1 500 ℃ preparation containing 20% -60% SiC , the clay clinker and clay compacts . Analysis of the sintered compacts of physical, mechanical and fire-resistant properties, and discusses changes in phase composition . Containing 20% SiC and 40% SiC refractory material having a certain load at a high density , high refractoriness , and has good corrosion resistance , is often used in furnace lining . In the ceramic industry, with 40% SiC and 60% SiC refractories , as one of the high content of SiC , under certain load has good thermal shock resistance , oxidation resistance and refractoriness , it is often used as kiln burning tank cars and use .
Refractories Refractoriness of not less than 1580 ℃ for a class of inorganic non-metallic materials . Refractoriness is the refractory cone specimen in the absence of load cases, resistance to high temperature without melting down the softening temperature in Celsius . Sic Refractory materials are widely used in metallurgy industry , chemical industry , petroleum, machinery manufacturing, silicates , power , etc., the largest amount in the metallurgical industry , accounting for 50 % to 60% of total production.
Statistical data as a processing methods and techniques in the refractory industry has been widely used. Take it to the next production of refractories and refractory good run important decisions for the smooth conduct of refractories acceptance sampling for scientific refractory to draw final conclusions , made ​​an indelible contribution.

alloying

Rare earth reinforcement in the aluminum powder alloy, mainly fine grain strengthening, solid solution strengthening limited and rare earth compound second phase strengthening, etc. When not at the same time, for the amount of rare earths in rare earth aluminium alloy mainly exists in three forms: alpha (Al) solid solution in the matrix; Partial gathered in the grain boundary phase boundary, grain boundary and branches; Solid solution, or in the form of compounds in the compound. When rare earth content is low (less than 0.1%), rare earth mainly used two forms of distribution. The first form have the effect of the limited solid solution strengthening, the second type increases the resistance to deformation, promote the dislocation multiplication, the strength Calcium silicon. After joining the rare earths, the alloy as-cast organization, alloy grain size significantly reduced, could reduce the secondary dendrite spacing, rare earths and Al, Mg and Si element such as the formation of the intermetallic compound spherical and short rod distribution in grain boundaries or limits, distribution of a large number of dislocation in tissue. When the rare earth content is more than 0.1%, after a form began to dominate. At this time, rare earth with the other elements in the alloy begin to form many new phase containing rare earth elements; At the same time make change shape, size of the second phase, may make the second phase from a long strip shape into a short rod-shaped particles, such as, the size of the particles is also becoming more small, and scattered. Most containing rare earth elements in the second phase of the characteristics of the particles, the spheroidizing and refinement, this kind of change are reinforced aluminum alloy to some extent.

Rare earth is explained in rounding of aluminum and its alloys

Studies show that of Al - Si metamorphic process directly affects the bad effect of rare earths. Stability metamorphic organization is the key to reduce the loss of rare earth, and to prevent the rare earth together, in the rare earth evenly spread rapidly to the liquid Alumina Oxides; In order to obtain stable metamorphic organization, should as far as possible to improve metamorphic temperature, metamorphic strengthen let stand, after strictly grilled slag after refining, and as far as possible need not halogen element flux for refining and cover. Rare-earth has certain incubation period, must maintain a certain amount of time at high temperature, rare earth can maximize metamorphism.
Purification effect
Rare earths to gas and the impact on the rate of pinhole
Aluminum and its alloy in the casting process, a large amount of gas will dissolve in liquid aluminum, mainly hydrogen (about 85% of gas in liquid aluminum), followed by oxygen and nitrogen. Hydrogen source is mainly in charge of water vapor, aluminum ingots and leftover material of oil, water, and on the surface of the aluminium ingot aluminum "rust" - Al (OH) 3. Hydrogen is the main reason for the aluminum powders casting of pinhole, and significantly reduce the strength of the aluminum. All can in rare earth added to the aluminum and its alloy degassing effect. When less than 0.3% for the amount of rare earth, rare earth in addition to the obvious effect of hydrogen, reduce the amplitude of pinhole rate is the largest also. After more than 0.3% when the content of rare earth, rare earth content increases, the hydrogen content is slowed down. If Y, single rare earth La, when rare earth content more than 0.3%, the increase of the content of rare earth makes hydrogen content started to rise again, changes in the rate of pinhole has the same rule, but the change is more obvious. The author thinks that to hydrogen effect in order to Y > La > Re (mixed rare earth); From the content, a single rare earth content is less than 0.3%. Rare earth with oxygen, nitrogen can generate a kind of refractory compounds Re2O3 and ReN2. In the process of smelting, mostly in the form of slag elimination; At the same time, when temperature is less than 200 ℃, rare earth and fluorine, chlorine violent action can generate of rare earth and rare earth chloride, fluoride to remove fluorine and chlorine in aluminum. So, the rare earth in the aluminum alloy can be used as purifying agent.

Rare earth application in aluminium alloy

Rare earth is effective additives in metallurgical industry, rare earth metal has the very high chemical activity, low potential and special black silicon carbides shell structure, almost can react with all elements. Rare earth resources in China is very rich, complete varieties, good quality, wide distribution, mining and convenient. Has proven reserves of rare earths, of t, accounting for 80% of the world's reserves, the world in the first place. In recent years,
Rare earths in metallurgy, machinery, petrochemical industry, electronic, atomic energy, medical, agriculture, aviation and defense Brown Corundum and other fields has been widely used. Rare earth started relatively late in the application of aluminum and its alloys, abroad began in the 1930 s, China began in ShangShi 60 s, but develops very fast, especially in the role of aluminum and its alloys and applied research has achieved obvious effect. This is mainly concentrated in the silicon al-si casting alloy, aluminum and magnesium (zinc) deformation aluminium alloy, aluminium alloy wire and piston alloy, etc. The influence of rare earth on aluminium and its alloy regularity and mechanism research has made some progress.

Types of high alumina refractories

Ordinary Alumina Oxide bricks: the main mineral composition of alumina bricks mullite, corundum and glass phase. With products in the aluminum oxide content.Increases, mullite and corundum phases increases the number, a corresponding reduction in the glass phase, products increase as refractoriness and high temperature performance
Modified alumina bricks: including high load soft high alumina bricks, high alumina bricks micro-expansion, low creep high alumina bricks, high alumina brick phosphate-binding.

Calcined corundum abrasives advantages

1, the elimination of the aluminum oxide abrasive abnormal expansion: As in the smelting process of fused alumina abrasive containing low-cost titanium (Ti 0, TiO) and titanium carbide, titanium nitride (Tic, TiN), their 1000% to 900% of a calcined in an oxidizing atmosphere, it will further oxidation, the volume increases accordingly, the volume change of the abrasive itself beyond its normal expansion, the expansion is abnormal.
Abnormal expansion of the abrasive, the ceramic corundum grinding wheel causes the firing, the surface mesh cracks, resulting in a large waste, and the use of calcined aluminum oxide abrasive to eliminate anomalous expansion of the most effective means.
2, to improve the toughness of the aluminum oxide abrasive and grinding performance: The study found, this is due to the abrasive in the calcination process, the first corundum crystalline solid melting at the TI3 + is oxidized and cause contraction of the lattice, thereby increasing the abrasive resistance compressive strength, followed by calcination in the granulation process will make the internal stress caused.
Thus, after calcination produces a variety of abrasive grinding tools, not only durable and sharp increases abrasive grinding performance.

Quartz powder production technology introduced

According to the final use of the product needs to determine the appropriate and suitable purity quartz particulate material , you can make quartz powder ( silica ) grinding .
Basically, the abrasive quartz powder, a wet and dry in two ways , namely wet blended with a certain proportion of the raw materials in water ( if the product is of high purity , deionized water can be used ) , in a grinding machine , then use the water classification ( sub granularity ) , drying process .
This method had previously been used as a wider range of silica processing methods , but because of its need to consume a lot of water , emit large quantities of contaminated water and waste a lot of heat drying , water classification accuracy is relatively low granularity , use is also dwindling .
Currently, only a small part of the requirements of the electronics industry requires a special use of such products.
Dry grinding currently used more widely , and there is more and more increasing trend . The basic approach is to choose a suitable grinding media for grinding and sieving or air classification granularity ( sub granularity ) . In this way , environmental economy , and the exact size air classification , the only shortcoming is that the composition of the wear of grinding media , the product will be a small increase in its ingredients. So choose a highly efficient grinding effect , low wear and, as a small amount of impurities contained in the product acceptable for most industries grinding media are particularly important .
Currently, a large industry proved corundum alumina ( main component of 95% Al2O3, other minor components mainly SiO2) is the most suitable grinding media . Various industries, basically acceptable use of alumina corundum abrasive silica products.
Silicon micro- grinding equipment selection , there are a variety of grinding equipment, a rod mill , cone mill, Raymond machine, but because of its inevitably bring products in the processing of a large number of Fe2O3 content , it can only for the production of building materials, refractory and other industries low demand quartz powder .
Electronics, chemicals , paint and other industries generally use the ball mill, jet mill , but it can be a huge airflow wear suitable only for 2500 mesh products with fine , so far the most widely used is the ball . May be wet , but also for dry -type , for the continuous production , but also for the production batches . Wherein the abrasive media can also choose to select the previously mentioned alumina corundum, quartz can also choose to block itself can also be used with both .
It can also be controlled with air classifier granularity control the final product , is currently the most widely used in the production of silica as a reasonable solution .

The six factors affecting high temperature alumina what are

High temperature alumina familiar friends, and you should know that it is composed of three different aluminum hydroxide gel consisting of a mixture ratio. The six factors affecting high-temperature alumina are what it? Let us work together to understanding and knowledge.
1, the particle size: the smaller the size, the higher adsorption capacity, but the smaller the particle size, the lower the particle strength, affect their life.
2, chloride and sulfate ions.
3, the raw water PH value: When the PH value is greater than 5:00, PH value is lower, high temperature alumina adsorption capacity is higher.
4, the initial raw water fluoride concentration: the higher the initial fluorine concentration, greater adsorption capacity.
5, As of: high alumina adsorption of arsenic in water, arsenic accumulation of alumina at high temperatures result in a decline in adsorption capacity of fluoride ions, and arsenic ions eluted when the reproduction is difficult.
6, the raw water alkalinity: raw water bicarbonate concentration, adsorption capacity will be reduced.