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Alumina Chemical Composition And Influence

Hangzhou JWG Technology Co.Ltd | Updated: Nov 03, 2017

Bauxite is alumina. According to their use will be divided into metallurgical grade, chemical grade, refractory grade, grinding grade, cement grade. Used to make refractory materials, this type of bauxite is called refractory grade bauxite. Alumina clinker with a suitable ratio of AL2O3 / Fe2O3 and AL2O3 / SiO2 for bauxite clinker with a suitable alumina / Fe2O3 and Al2O3 / SiO2 ratio

Bauxite bauxite, also known as bauxite or bauxite, the main mineral composition of a diaspore, boehmite, gibbsite, is a Mohs hardness of 1 to 3 The ore, which is usually the most commonly used raw ore for smelting aluminum and producing refractory materials, is mainly composed of alumina, hydrated alumina containing impurities, and is an earthy mineral. Density 3.9 ~ 4g / cm3, opaque, crisp, extremely difficult to melt, insoluble in water, soluble in sulfur. Bauxite bauxite processing process 1. High temperature calcination: raw materials into the calciner for high temperature calcination, some can also be used to dry the way. 2. Broken milling: The calcined material is crushed by a jaw crusher or a hammer crusher and then fed into a Raymond mill. Broken material into the mill production system, the entire milling, grading and other operating processes are completed within the mill automation, the operator should pay close attention to electrical control cabinet instrumentation data. Qualified bauxite powder discharged by the discharge valve, packaging products. Bauxite processing equipment Calcination equipment: bauxite rotary kiln, the device advanced calcination mechanism, the finished product of high quality, the overall operation of a high degree of automation, safety and environmental protection. Crushing equipment: Jaw crusher or hammer crusher, large particles of bauxite crushed. Milling equipment: The general use of bauxite Raymond mill has been able to meet the needs of bauxite size, milling evenly.

The chemical composition and influence of bauxite

The mineral composition of bauxite is mainly diaspore (diaspore), kaolin, illite and montmorillonite, and the impurities are ilmenite, limonite, pyrite, tourmaline, calcite, quartz, etc. , Its chemical composition is mainly alumina, alumina and water, and contains a small amount of titanium oxide, iron oxide, calcium oxide, magnesium oxide, potassium oxide, aluminum oxide and organic impurities.

Among them, alumina is the main beneficial component of bauxite. The higher the alumina content, the higher the refractoriness. Silicon oxide in the clay mostly aluminosilicate exists, a small amount of free silica is present. Free silica can weaken the plasticity and adhesion of clay. Iron mineral (iron oxide) is the most common harmful impurity in refractory clay, which can reduce the refractoriness and slag resistance of the product and cause the scar of the refractory product. Calcium Magnesium Carbonate and Sulfate Minerals, when the content is too high, the clay can reduce the refractoriness, increase the sintering shrinkage, reduce the load softening temperature and make the product crack. Titanium dioxide varies with the content of refractory clay Effect, the right amount of titanium oxide can play a role in the sintering flux, can promote sintering, but excessive titanium dioxide is reduced refractoriness and mesh cracks. Potassium and sodium oxide reduce the load softening temperature of the product when the content of clay is high. Organic matter is one of the ubiquitous impurities in clay. When the content is too high, it can reduce the slag resistance and increase the loss on ignition.

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