Filtering aid for filtering aluminate solution and using method thereof

Abstract

A filtering aid for filtering an aluminate solution and a using method of the filtering aid relate to a method of using pulverized coal ash and pulverized coal ash residue to serve as the filtering aid. The filtering aid is characterized in that the filtering aid is pulverized coal ash and pulverized coal ash residue of thermal power plants. According to the method, the source of raw materials for the filtering aid is stable and reliable, the preparation method is simple, convenient and practical, and the used raw materials are industrial waste and are low in price and convenient to use. The pulverized coal ash and pulverized coal ash residue have adsorption and entrapment effects on solid impurities and particles suspended in liquid due to different particle sizes and porous characteristics, thereby the purpose of liquid and solid seperation is achieved. The pulverized coal ash and pulverized coal ash residue are used as the filtering aid so that the filtering aid does not cause the loss of an aluminum element in the leaf filtration process, also does not introduce other impurity elements to the leaf filtration process, can keep chemical compositions of an original solution in stability and constant to the maximum limit and is easy to popularize and apply in industry.

Description

technical field [0001] A filter aid for filtering aluminate solution and a method for using the same, relating to a method for using fly ash and fly ash slag as a filter aid to filter aluminate solution. Background technique [0002] Aluminum salt (aluminate) solution is the most basic raw solution for producing alumina and aluminum. The purity of this solution directly affects the chemical purity and product quality indicators of the obtained product. Therefore, the leaf filtration of the floating matter in the aluminum salt (aluminate) crude liquid is an important link in the alumina production process. The addition of filter aids uses its sieving and adsorption effects to trap solid impurity particles suspended in the liquid on the surface and voids of the filter medium, thereby achieving the purpose of solid-liquid separation. [0003] In the alumina production process, milk of lime is generally used as a filter aid, because it can improve the crude liquid filtration pe...

AI Technical Summary

Problems solved by technology

[0003] In the alumina production process, milk of lime is generally used as a filter aid, because it can improve the filtration performance of crude liquid and improve the quality of Bayer semen, but this filter aid method has the following disadvantages: 1. Oxidation in the sodium aluminate solution Aluminum loss, which in turn affects production capacity; 2. Increase energy consumption for evaporation