Method for producing titanium-enriched slag and water purifier through co-deposition of red mud and iron-containing waste acids

Abstract

The invention relates to the technical field resource environments and provides a method for producing titanium-enriched slag and a water purifier through co-deposition of red mud and iron-containingwaste acids. The method comprises the following steps: (1) mixing red mud and iron-containing waste acids, and performing a neutralization reaction so as to obtain a reaction material; (2) performingsolid-liquid separation on the reaction material so as to obtain a liquid and a solid respectively; and (3) mixing the liquid with an oxidant, performing a polymerization reaction so as to obtain thewater purifier, and drying the solid so as to obtain the titanium-enriched slag. A soluble part of red mud is dissolved by using the iron-containing waste acids to produce the water purifier, and meanwhile, titanium in an insoluble part of the red mud can be enriched to produce the titanium-enriched slag. By adopting the method, resource co-deposition of two wastes, namely the red mud and the iron-containing waste acid, is achieved, high-value products are prepared, zero emission of wastes is achieved, and the comprehensive cost is low; and in addition, the method is simple in process, simpleand convenient in operation and remarkable in economic benefit and environment benefit.

Description

technical field [0001] The invention relates to the technical field of resources and environment, in particular to a method for co-processing red mud and iron-containing waste acid to produce titanium-rich slag and water purifier. Background technique [0002] Red mud is the main solid waste in the alumina industry. Red mud generally contains 25 to 50 wt% of water. The main solid components are alumina, iron oxide, calcium oxide, silica and sodium alkali, and a small amount of titanium dioxide. , scandium oxide and magnesium oxide, etc., the chemical composition of red mud is shown in Table 1. Due to the difference in aluminum ore raw materials and production processes, about 0.5-2.5 tons of red mud is produced for every 1 ton of alumina produced. At present, the cumulative stockpiles of red mud in various parts of my country have reached more than 300 million tons, and the comprehensive utilization rate of red mud is only about 10%, and the cost is relatively high. With t...

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Problems solved by technology

The existing methods of disposing of iron-containing waste acid are mainly to concentrate the waste acid to reach a concentration of more than 65% after removing iron from the waste acid, and then use it again with acid. However, the cost of concentrating the waste acid is huge and the equipment is severely corroded; and disposal, but the cost of neutralization is also huge, and neutralization with calcium oxide will also produce a large amount of calcium sulfate solid waste

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