China is relatively rich in bauxite resources, and 205 bauxite origins have been identified in 18 provinces, autonomous regions, and municipalities directly under the Central Government, including 72 large-scale origins (excluding Taiwan). Mainly distributed in Shanxi, Shandong, Hebei, Henan, Guizhou, Sichuan, Guangxi, Liaoning, Hunan and other places. As an additive material for sintering flux, ores from Henan are mainly used, and the ore veins are mainly distributed in Luoyang, Zhengzhou and other places. Compared with Shanxi materials, the density is lower. Bauxite produced in Shanxi is more widely used in refractory materials.
Product use
⑴ aluminum smelting industry. Used in national defense, aviation, automobiles, electrical appliances, chemicals, daily necessities, etc. ⑵Precision casting. The bauxite clinker is processed into fine powder to make a mold and then precision cast. Used in military industry, aerospace, communication, instrumentation, machinery and medical equipment departments.
(3) For refractory products. High alumina bauxite clinker has a refractoriness of up to 1780°C, strong chemical stability and good physical properties.
⑷Aluminosilicate refractory fiber. It has the advantages of light weight, high temperature resistance, good thermal stability, low thermal conductivity, small heat capacity and mechanical shock resistance. Used in steel, nonferrous metallurgy, electronics, petroleum, chemical industry, aerospace, atomic energy, national defense and other industries. It is to put the high-alumina clinker into a high-temperature electric arc furnace with a melting temperature of about 2000-2200 ° C. After high-temperature melting, high-pressure high-speed air or steam injection, and cooling, it becomes white "cotton" - aluminum silicate Refractory fiber. It can be pressed into fiber blankets, boards or woven into cloth to replace refractory bricks lining high-temperature kilns in smelting, chemical, glass and other industries. Firefighters can use refractory fiber cloth to make clothes.
⑸Using magnesia and bauxite clinker as raw materials, adding a proper binder, it is very effective for pouring the overall lining of the steel drum.
⑹ Manufacture of bauxite cement, abrasive materials, ceramic industry and various compounds of aluminum in the chemical industry. Technical conditions for the quantity of bauxite used in refractory materials: grade chemical composition refractoriness bulk density Al2O3CaOFe2O3 special grade>85<0.6<1.4.0>1790>3.6 first grade>80<0.6<3.0>1790>3.0 second grade armor 70～80 <0.8<3.0>1790>2.8 Secondary B 60～70<0.8<3.0>1770>2.65 Tertiary 50～60<0.8<2.5>1770>2.55 Deposit Types Bauxite deposits in China can be divided into two types: Paleo-weathered crust type bauxite deposits (type I) and laterite type bauxite deposits (type II). The former category is further divided into four subcategories: Xiuwen style, Xin'an style, Pingguo style and Zunyi style. The latter category has only one subcategory, called the Zhangpu style. 1) Xiuwen type: also known as carbonate rock paleo-weathering crust off-site accumulation subtype bauxite deposit. Its genesis is related to the paleo-weathering crust of carbonate rock karst laterite. And because there are several meters thick lacustrine iron ore lentil deposits between the bauxite and the underlying carbonate bedrock, the bauxite is not accumulated in situ, but the laterite weathering near the lake that is almost dry The shells migrated from different places to accumulate. This type of deposit is typical of the Xiaoshanba bauxite deposit in Xiuwen County, Guizhou. This is the most important type of bauxite in China, and its reserves account for 74.76% of this type (Type I). 2) Xin'an type: also known as the in situ accumulation subtype of carbonate rock paleo-weathering crust, and the Zhangyaoyuan bauxite deposit in Xin'an, Henan is more typical. Its reserves account for 5% of this type (Type I). 3) Pingguo type: also known as carbonate paleo-weathering crust in-situ accumulation-modern karst accumulation subtype bauxite deposit. The overlying and underlying bedrock of the deposit is limestone within hundreds of meters of thickness. After Quaternary karstization, limestone and bauxite ore weathered into calcium laterite and bauxite ore fragments Falls into piles of ore. It accounts for 15.04% of the total reserves of paleo-weathered crust bauxite. 4) Zunyi type: also known as aluminosilicate ancient weathering crust in situ accumulation subtype bauxite deposit, the underlying bedrock is fine clastic rock or basic volcanic rock, and the underlying bedrock is laterite weathering crust in situ accumulation (a few slopes) of bauxite deposits. There is a continuous transition phenomenon between the bauxite and the underlying bedrock, and there is an erosion discontinuity between the bauxite and the overlying strata. It accounts for 5.2% of the reserves of Type I deposits. There is only one subtype of lateritic bauxite deposits, called Zhangpu lateritic bauxite deposits, which are bauxite deposits formed by modern (Quaternary) weathering of Tertiary to Quaternary basalts, and their reserves are very large. Less, accounting for only 1.17% of China's total bauxite reserves. Product Difference The bauxite referred to in the refractory industry usually refers to bauxite with Al2O3>=48% after calcination and low content of Fe2O3, and high-alumina bauxite clinker is calcined bauxite ore. The clinker is off-white, light yellow and dark gray. It is mainly used for high-alumina refractory materials, and can also be used to make fused brown corundum. High-alumina bauxite clinker is classified according to the content of AL2O3, the content of impurities such as Fe2O3, TiO2, CaO+MgO, K2O+Na2O, and the clinker volume density and water absorption. Light-burned bauxite, also known as light-burned powder, is the raw material of water purifying agent polyaluminum chloride. It is a mineral powder material produced by processing bauxite. The main component is alumina, which is hydrated alumina containing impurities. It is an earthy mineral. White or off-white, brownish-yellow or light red due to iron content. Density 3.9-4g/cm3, hardness 1-3, opaque and brittle. Extremely difficult to melt. Insoluble in water, soluble in sulfuric acid and sodium hydroxide solution.
