Application of andalusite

Introduction:Andalusite is a kind of columnar crystal. Generally, the crystal of andalusite is radial or granular, which is very good-looking. A variety of andalusite is often used to make small ornaments. Some people also call the radial andalusite "chrysanthemum stone", as the name suggests, because its shape is like a blooming chrysanthemum. As a kind of aluminosilicate mineral, andalusite is usually pink, red, reddish brown or grayish white, which has a very good luster. Usually, andalusite is used as the raw material of porcelain.Distribution range:China is rich in resources, especially for this kind of mineral resources. China started the exploration and mining of andalusite as early as 1978. Because of its high quality and rich andalusite resources, there is a good prospect for the development of andalusite industry in China. At present, there are abundant andalusite resources in Liaoning, Jilin, Shandong, Henan, Xinjiang, Qinghai, Sichuan and other regions in China.Application:Andalusite is a very refractory mineral, but also has physical and chemical properties. Generally speaking, andalusite is used as a high-grade refractory for smelting industry, or for firing porcelain. In fact, andalusite can also be used to make light aluminum silicon alloy, and such high-grade materials can also be used as materials for supersonic aircraft and spacecraft. Nowadays, there are some foreign countries using andalusite to make radome. However, most andalusite of ordinary quality can only be used as handicraft and decoration.

How to synthesize cordierite industrially?

High temperature solid-state reaction is still a common method for industrial synthesis of cordierite materials, which has the advantages of simple production process and high production efficiency; the major problems of this method are high synthesis temperature, high energy consumption and high production cost. The synthesis temperature of kaolin talc alumina system is 1390 ℃ - 1400 ℃. Using modern testing technology to thoroughly find out the mechanism of high temperature synthesis of cordierite, and actively study the method of reducing the synthesis temperature is of great significance. The future work is to continue to explore the high temperature characteristics of various raw materials, in-depth study of various batching systems, high temperature synthesis reaction mechanism, make full use of China's rich non-metallic mineral resources, and develop a more economical and reasonable batching system In order to achieve low-cost synthesis of high-purity cordierite materials, we should formulate scientific synthesis process system, reduce the synthesis temperature of cordierite.

Molding method and raw material requirement of lig

1. Determination of molding method. There are three ways to produce light mullite bricks at home and abroad: foam method, additive burning method and gasification method. 2. Raw material requirements. A, foam polystyrene beads: the appearance is white, granular, uniform particle size, diameter 0, 5 - 2ram.Molding method and raw material requirement of light mullite brickb. Sawdust: fine sawdust is selected by 2nun sieve, which is easy to be formed because of its high workability and excessive addition. It is difficult to form, easy to expand after drying, and easy to deform when firing, resulting in low strength of the finished product.Molding method and raw material requirement of light mullite brickFormula three, formula four, formula five with foam polystyrene beads as burning additives, foam polystyrene beads do not absorb water, drying shrinkage is small, can not help transfer moisture, brick drying in the first drying process, the internal moisture can not run out in time, the surface is prone to micro cracks. When the body is sintered, the foam polystyrene beads form larger pores, but the surrounding materials are dense and dense. The structure is not structured (see photo), the lightweight mullite brick structure is A.D foam polystyrene beads are burnt B additives, as the burning additive formula six, formula seven, formula eight, formula nine, composite additives are used as burning additives.Molding method and raw material requirement of light mullite brickSawdust can absorb water, help transfer water, easy to burn out, can prevent the brick from cracking, and can play the role of filling the bead space and reducing the density. Foam polystyrene beads have small drying shrinkage and low moisture content after molding. The drying deformation of products is small and the size of finished products is more accurate.