Recovery method and recovery device of 4A zeolite mother liquor

Abstract

The invention provides a recovery method and a recovery device of 4A zeolite mother liquor. The recovery method comprises the following steps of (1) adding impurity removal agents into the 4A zeolitemother liquor for impurity removal reaction; performing filtering; collecting filter liquid; (2) performing concentration treatment on the filter liquid to obtain 4A zeolite circulation liquid, wherein in the filter liquid, the aluminum oxide content is 0g / L, the silicon oxide content is lower than 0.2g / L, and the carbon alkali content is lower than 8g / L. The method has the advantages that the scale forming speed of the 4A zeolite mother liquor during the recovery evaporation on an evaporator can be reduced; the scale cleaning frequency of the evaporator is reduced; the production continuity is improved; the production and operation cost is reduced; the useful ingredients in the 4A zeolite mother liquor can be remained at maximum; the recovery efficiency of the useful ingredients in the 4Azeolite mother liquor is improved.

Description

technical field [0001] The invention relates to a method and a recovery device for recovering 4A zeolite mother liquor, and belongs to the technical field of producing alumina and co-producing 4A zeolite by high alumina fly ash soda lime sintering method. Background technique [0002] With the increasing shortage of bauxite resources in our country, the use of fly ash, coal gangue and other industrial solid wastes to extract alumina has attracted more and more attention. According to statistics, the potential reserves of high-aluminum fly ash in the central and western regions of Inner Mongolia are as high as 15 billion tons. Therefore, the comprehensive development and utilization of aluminum and silicon elements in these high-alumina fly ash resources can not only ensure the strategic security of my country's aluminum industry, but also benefit the local environmental protection and development. It is a circular economy industry with important strategic significance. [0...

AI Technical Summary

Problems solved by technology

[0004] After 4A zeolite is synthesized, filtered and washed, the 4A zeolite mother liquor needs to be evaporated and concentrated to be recycled. However, since the 4A zeolite mother liquor adopts the process of first concentrating (evaporating) and then removing impurities, during operation, it is easy to be in the first effect and flash of the evaporator. Scarring occurs, resulting in a production run that can only last for about a month, and then has to be interrupted for scarring cleaning, which greatly increases the operating cost of the production process and directly affects the unit cost of alumina production

At the same time, because lime milk is used for impurity removal, during the liquid-solid separation process after impurity removal, due to the small difference in liquid-solid density and the high concentration of attached liquid, difficulties in liquid-solid separation will occur, and a large amount of useful components in the attached liquid will be taken away by the solid The problem

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