Iron removing and whitening method for indianite

Abstract

The invention relates to an iron removing and whitening method for indianite. The iron removing and whitening method for the indianite is characterized by comprising the following steps: (1) preparing the following chemical reagents: (1) reducing agents, i.e. sodium bisulfite and zinc powder; and (2) a complexing agent, i.e. any one of oxalic acid, tartaric acid and phosphoric acid; (2) preparing size, i.e. preparing indianite size the concentration of which is between 15 and 20 wt% by adding water into crude ore of the indianite and using sulfuric acid solution the concentration of which is between 1.0 and 3.0mol / L to regulate a pH value to make the pH value is between 2 and 3 to obtain the indianite size the pH value of which is regulated; (3) performing a reduction reaction, i.e. adding the reducing agents into the indianite size the pH value of which is regulated, stirring the mixture to perform a reaction for 25 to 30 minutes and continuously regulating the pH value in the process of the stirring reaction to maintain the pH value between 2 and 3 to obtain the size subjected to the reduction reaction; and (4) adding the complexing agent into the size subjected to the reduction reaction, performing a reaction for 5 minutes, washing the reaction product and drying to obtain the indianite subjected to iron removal and whitening. The iron removing and whitening method is suitable for industrial production and has obvious effect.

Description

technical field [0001] The invention relates to a method for chemically removing iron and whitening halloysite, in particular to a reduction complex iron removing method. technical background [0002] Halloysite is one of the main minerals that make up kaolin, which belongs to layered silicate, has a curly nanotube structure, and its chemical composition is the same as kaolinite. Because it contains water between its layers, it is also called multi-water kaolinite. The use of halloysite is similar to that of kaolinite, and it is also a raw material for high-quality ceramics. It can be used as a carrier for synthesizing molecular sieves and catalysts in the chemical industry, and as a filler in the plastics, rubber and paint industries. However, during the ore-forming process of halloysite, some dark minerals are often accompanied, or some color-causing elements, such as iron, titanium, and organic matter, are adsorbed in the inner cavity or surface of the halloysite tubular...

AI Technical Summary

Problems solved by technology

[0004] At present, domestic research on halloysite iron removal has not been reported, but there are many studies on kaolin iron removal, mainly using physical, chemical and biological methods

The traditional iron removal process of kaolin generally uses hydrosulfite to carry out direct iron removal experiments under acidic conditions. Due to the instability of hydrosulfite, it will cause great losses during the test process and increase the cost of the experiment.

Patent: A method for biologically removing iron and whitening kaolin by iron-reducing bacteria using molasses as a carbon source (CN101671033A). In this method, sugar factory waste molasses is used as iron-reducing bacteria to carry out biological iron-removing and whitening of kaolin. Suitable for industrial production; Patent: Kaolin Clay Iron Removal and Bleaching Process (CN1018996B) is a process for removing iron and bleaching in kaolin by direct complexation, which has a long process cycle and incomplete reaction; Patent: Kaolin Selective Dispersion-Flocculation Iron Removal Process ( In CN1101592A), the method of dispersing and flocculation is used to remove iron from kaolin. This method is better for fine iron particles, such as leaching iron ions, but when iron particles exist in kaolin in the form of independent minerals or associated minerals, Iron removal effect is poor