Method of using water-washing filtrate for acidolysis extraction

A filtrate and leaching technology, which is applied in the field of sulfuric acid titanium dioxide production process, can solve the problems that it is difficult to meet the recovery demand of a large amount of washing filtrate, the output of washing filtrate is large, and the recovery cost is high, so as to achieve significant economic and environmental benefits, process optimization, and improvement Effect of Titanium Yield

Inactive Publication Date: 2017-06-27
SICHUAN LOMON TITANIUM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method makes it possible to recover the washing filtrate in the industry, but it still needs a certain recovery cost, and the output of the washing filtrate is very large. This method is difficult to meet the recovery demand of a large amount of washing filtrate

Method used

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  • Method of using water-washing filtrate for acidolysis extraction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Washing filtrate is used to prepare titanyl sulfate solution A according to the following method:

[0041] (1) Take the titanium concentrate powder that has been dried and crushed to a 325-mesh sieve with a residue of 20%, mix it with the titanium concentrate powder with a sulfuric acid solution with a concentration of 70% at an acid-mineral ratio of 1.7, and heat up to 150° C. Acid hydrolysis reaction, until the mixture is solidified, in solid phase.

[0042] (2) The obtained solid phase is aged at 180°C for 4h, and then at 75°C, the sulfuric acid containing 28wt%, the titanium content (as TiO 2 Total) is 57g / L washing filtrate according to 10wt% of clarified water and adds acid hydrolysis pot to leach the material after ripening in order according to 10wt% of clarified water, leaching time 1h, obtains leaching liquid.

[0043] (3) After leaching, add reduced iron powder to the leaching solution for reduction reaction.

[0044] (4) After the reduction reaction is com...

Embodiment 2

[0047] The washing filtrate is used to prepare titanyl sulfate solution B according to the following method:

[0048] (1) Take the titanium concentrate powder that has been dried and crushed to a 325-mesh sieve with a residue of 10%, mix it with the titanium concentrate powder with a sulfuric acid solution with a concentration of 80% at an acid-mineral ratio of 1.3, and heat up to 130° C. Acid hydrolysis reaction, until the mixture is solidified, in solid phase.

[0049] (2) The obtained solid phase is aged at 160°C for 3h, and then at 70°C, the sulfuric acid containing 20wt%, the titanium content (as TiO 2 Total) is 30g / L washing filtrate according to 20wt% of clarified water, add acid hydrolysis pot leaching the material after ripening in sequence, leaching time 3h, obtain leaching solution.

[0050](3) After leaching, add reduced iron powder to the leaching solution for reduction reaction.

[0051] (4) After the reduction reaction is completed, the reducing solution is pu...

Embodiment 3

[0054] The water washing filtrate is used to prepare titanyl sulfate solution C according to the following method:

[0055] (1) Take the titanium concentrate powder that has been dried and crushed to a 325-mesh sieve with a residue of 5%, mix it with the titanium concentrate powder with a sulfuric acid solution with a concentration of 80% at an acid-mineral ratio of 1.0, and heat up to 110° C. Acid hydrolysis reaction, until the mixture is solidified, in solid phase.

[0056] (2) The obtained solid phase is aged at 150°C for 1h, and then at 60°C, the sulfuric acid containing 11wt%, the titanium content (as TiO 2 Total) is 18g / L washing filtrate according to the 50wt% of clarified water and adds acid hydrolysis pot leaching the material after ripening sequentially, leaching time 5h, obtains leaching solution.

[0057] (3) After leaching, add reduced iron powder to the leaching solution for reduction reaction.

[0058] (4) After the reduction reaction is completed, the reducin...

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Abstract

The invention relates to a titanium dioxide production process through a sulfuric acid method, in particular to a method of using water-washing filtrate for acidolysis extraction. The method includes following steps: A, mixing a titanium-containing raw material with concentrated sulfuric acid for acidolysis; B, adding metered water-washing filtrate into a solid-phase material; C, adding water into the solid-phase material for extraction; D, adding reduced iron powder into extract, and subjecting reduced solution to solid-liquid separation to obtain titanyl sulfate solution. The method has the advantages that the water-washing filtrate can be used for acidolysis extraction, so that sulfuric acid and titanium resources in the water-washing filtrate are recycled fully, titanyl sulfate can be effectively prevented from generating colloid in the process of adding water for extraction, and byproduct recycling and process optimizing are integrated; the water-washing filtrate does not need to be subjected to impurity removal in the method, and ingenious recycling is realized on the basis of fully combining with the titanium dioxide production process through the sulfuric acid method, so that the method has remarkable economic and environment-protection benefit.

Description

technical field [0001] The invention relates to a sulfuric acid method titanium dioxide production process, in particular to a treatment method for by-products in the sulfuric acid method titanium dioxide production. Background technique [0002] Since the discovery of titanium in 1791 and the commercial production of titanium dioxide by the sulfuric acid method in 1918, there have been more than 80 years of production and commercial use history. The production processes of titanium dioxide mainly include sulfuric acid method and chlorination method. The main domestic process is the sulfuric acid method, and its typical production process can be summarized as follows: [0003] 1. Acid hydrolysis: use titanium concentrate or acid-soluble titanium slag to carry out acid hydrolysis reaction with sulfuric acid to obtain titanyl sulfate solution; [0004] 2. Hydrolyze titanyl sulfate: hydrolyze titanyl sulfate solution to obtain crude metatitanic acid slurry; [0005] 3. Wash a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053
CPCC01G23/0532
Inventor 张玉荣代堂军姚恒平朱全芳孙润发
Owner SICHUAN LOMON TITANIUM IND CO LTD
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