Method for acid hydrolysis of acid soluble titanium slag

Abstract

The invention belongs to the field of adopting the sulfuric acid process to prepare titanium dioxide, particularly relating to an acidolysis method for acid-soluble titanium slag and aiming at providing a novel acidolysis method for the acid-soluble titanium slag. The method has the advantages that the acidolysis rate can be enhanced and the manufacturing cost can be reduced and has the followingsteps: A. the acid-soluble titanium slag and sulfuric acid are mixed in an acidolysis reaction container, and compressed air of 0.1 to 0.35 MPa is injected into the container, and the mixture is stirred for 20 to 50 minutes; B. steam of 0.2 to 0.45 MPa is injected into the container and the material obtained from the step A is stirred while heating, and when the temperature of the material reaches 160 DEG C to 190 DEG C, the steam injection is stopped, and then the reaction generates a solidified material; C. the solidified material obtained from the step B is cured and extracted to obtain titanium solution which is then adopted to prepare titanium dioxide as the normal method. With the method, the acidolysis rate can be raised by 2 to 3 percent and simultaneously the manufacturing cost can be conserved due to that the low pressure compressed air and steam are adopted.

Description

technical field The invention belongs to the field of producing titanium dioxide by a sulfuric acid method, and in particular relates to a method for acidolysis of acid-soluble titanium slag. Background technique Titanium raw materials for sulfuric acid titanium dioxide production mainly include titanium concentrate and acid-soluble titanium slag. Using titanium concentrate as raw material, there are problems such as large consumption of sulfuric acid and many by-products of ferrous sulfate. Using acid-soluble titanium slag as raw material can save the iron filings reduction and freezing crystallization process. The titanium liquid is not concentrated or the energy consumption of concentration is reduced. It has the advantages of low energy consumption, less acid consumption, no by-product ferrous sulfate, and the formation of titanium liquid. It has the advantages of good stability and less discharge of "three wastes". "Research on the Acid Decomposition Process of Acid-...

AI Technical Summary

Problems solved by technology

The literature mentions that the mixing time of titanium slag and sulfuric acid with compressed air is 20 minutes, which is relatively too short to ensure that the titanium slag powder agglomerates are fully dispersed in the sulfuric acid solution, which will lead to titanium slag Incomplete acidolysis affects the improvement of acidolysis rate of titanium slag

In addition, the time for steam heating is short, which is not conducive to the full acidolysis reaction of titanium slag.

In order to obtain a higher acid hydrolysis rate, the late aging time and leaching are too long, which affects the production capacity

In the above literature reports and actual production, when the acid-soluble titanium slag is acidolyzed, the compressed air pressure is generally set above 0.4MPa, the steam pressure is set above 0.7MPa, and the mixing time of the acid-soluble titanium slag and concentrated sulfuric acid is too short (now If there is a method, the mixing time is generally 10min~20min), and the acid-decomposed solid phase directly leaves the production process, and does not return to continue to use

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