Preparation method of pseudo-boehmite

Preparation method of pseudo-boehmite：

There are many preparation methods for pseudo-boehmite. According to the source of raw materials and product properties, it can be divided into gibbsite quick removal method, aluminum salt neutralization method, aluminum alcohol method, alkali method, nitric acid method, etc. The preparation process includes gelation, aging, washing, drying and molding. Since the particle size of pseudo-boehmite is relatively small, attention should be paid to the process of precipitation, washing and drying.

Abroad, the pseudo-boehmite is usually produced by the aluminum alcohol method, and the obtained product has high quality and purity, but the production cost, energy consumption and sales price are relatively high.

Most of the methods used in China are neutralization methods such as acid method or alkali method, but problems such as production cost, product quality and environmental protection limit the improvement of the process.

Currently the production of pseudo-boehmite by carbonation is the process route with the lowest cost, but the single-phase pseudo-boehmite prepared by this method has harsh conditions, low strength of sodium aluminate solution, low gel concentration, and difficulty in forming. , the quality is poor.

Therefore, researching, developing and realizing new preparation technologies and new processes with controllable performance, low energy consumption, green environmental protection, and recyclability have become a key issue for the sustainable development of pseudo-boehmite.