Method for acidolysis and reduction of ferric iron by titanium dioxide to improve quality of titaniferous solution through sulfuric acid method

Abstract

The invention relates to a method for acidolysis and reduction of ferric iron by titanium dioxide to improve quality of a titaniferous solution through a sulfuric acid method. The method comprises the following steps: adding titania waste acid of which the mass fraction of sulfuric acid is 19%-25% and water to a solid-phase material which is formed by reaction of ilmenite and concentrated sulfuric acid to obtain the titaniferous solution; and adding iron powder to the reacted titaniferous solution, and reducing the ferric iron in the titaniferous solution into ferrous iron. According to the method, use of sulfuric acid is reduced; resource consumption is reduced; the leached titaniferous solution is pumped into a coiled pipe with cooling water, so that the temperature of the titaniferous solution is reduced; and reducing iron powder can be evenly and slowly added to the titaniferous solution to reduce the ferric iron; and the problem that of early hydrolysis of the titaniferous solution caused by a sharp increase of the reaction temperature and the problems that the quality of the titaniferous solution is reduced by colloid of generating metatitanic acid and the filtering speed of the procedure and the quality of the final titanium dioxide are affected are solved.

Description

technical field [0001] The invention relates to the field of a production process control method of sulfuric acid titanium dioxide, in particular to a method for improving the quality of titanium liquid through acidolysis and reduction of ferric iron by sulfuric acid titanium dioxide. Background technique [0002] In the production process of sulfuric acid titanium dioxide, the reaction between ilmenite and sulfuric acid is an important part of the production control of titanium dioxide, so the acid hydrolysis of ilmenite is called the "leader" of sulfuric acid titanium dioxide production, and the The quality directly affects the process control and product quality control of subsequent titanium dioxide production. Ilmenite contains a large amount of titanium and iron, and also contains trace amounts of aluminum, silicon, manganese, magnesium and other metal elements and non-metal elements. These elements release a large amount of chemical reaction heat during the reaction w...

AI Technical Summary

Problems solved by technology

[0009] In the industrial production process, after the reaction between ilmenite and sulfuric acid is completed, after adding dilute acid and water for leaching, it is necessary to add iron powder for the reduction of ferric iron, because the reaction is an exothermic reaction, and the usual industrial operation is It is completed in the acid hydrolysis tank at one time, the heat cannot be dissipated, and the operator always adds the measured iron powder into the acid hydrolysis tank at one time, resulting in a rapid reaction, and the temperature rises too fast. If the early hydrolysis of the titanium liquid occurs, The fine colloids of hydroxyl titanium are produced, which makes it difficult to filter and separate, and the stability of the titanium solution decreases, which seriously affects the quality of the titanium solution and causes a significant decline in the process quality. How to solve this process problem, there is no feasible process control method so far.

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