Active silicon slag, its preparation method, desiliconization method containing sodium aluminosilicate

Abstract

The invention discloses active silicon slag, a preparation method thereof, and a desilication method for silicon-containing sodium aluminate and belongs to the technical field of aluminum oxide production. The desilication method includes the steps of: a) adding the active silicon slag into a silicon-containing sodium aluminate solution to obtain a first mixture; b) performing a desilication reaction at a preset temperature to the silicon-containing sodium aluminate solution and the active silicon slag to generate a sodalite-type sodium-silicon slag solid from the silicon in the silicon-containing sodium aluminate solution and the active silicon slag to obtain a second mixture; c) performing solid-liquid separation to the second mixture to obtain the sodalite-type sodium-silicon slag solid and a primary desilication product of the silicon-containing sodium aluminate solution. The active silicon slag is used in the desilication method and is 1-5 [mu]m in particle size range. The preparation method is carried out with one of a rod miller, a sand miller, a ball miller or a tube miller for milling the sodalite-type sodium-silicon slag solid for 1-8 h to active the solid to obtain the active silicon slag. The method is simple and high-effective and is less in circulation quantity of silicon slag crystal seeds.

Description

technical field [0001] The invention relates to the technical field of alumina production, in particular to an active silicon slag, a preparation method thereof, and a desiliconization method containing sodium aluminosilicate. Background technique [0002] In the production process of sintered alumina, the sodium aluminate solution after clinker lye dissolution contains 4-6g / l silicon, which needs to be purified and removed by generating insoluble sodium-silicon slag to avoid polluting downstream products. The current desiliconization method in the industry is to directly add the crude liquid after clinker dissolution to the process by-product silicon slag as a seed crystal, perform high temperature and pressure desiliconization once, and add lime milk to the solution after liquid-solid separation for deep desilication. Since the particle structure of silicon slag gradually improves and grows during the circulation process, the activity of the seed crystals becomes poor. The...

AI Technical Summary

Problems solved by technology

Since the particle structure of silicon slag gradually improves and grows during the circulation process, the activity of the seed crystals becomes poor, and the desiliconization (pressure desiliconization) process currently has the disadvantages of large seed crystal circulation, high energy consumption, and low desiliconization efficiency.

Images