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Method for acidolysis of titanium slag

A technology of titanium slag and acid hydrolysis, applied in chemical instruments and methods, titanium dioxide, titanium compounds, etc., can solve problems such as difficulties in the popularization and application of titanium slag, high sulfur content in tail gas of titanium slag, and difficulties in tail gas treatment systems

Active Publication Date: 2021-01-26
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high sulfur-containing gas produced in the acidolysis tail gas of titanium slag makes the tail gas treatment system difficult, and causes great difficulties for the promotion and application of titanium slag
[0005] Looking at domestic scholars and production enterprises, solving the problem of high sulfur content in titanium slag tail gas mainly focuses on transforming the existing acidolysis tail gas system to adapt to the treatment of acidolysis tail gas with high sulfur content, which is a typical first pollution (emission) The "end treatment" mode of post-treatment, and the cost of tail gas treatment in this way is relatively high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A. Grind the titanium slag with a ball mill until the residue on a 325-mesh sieve is 0.5%, pre-mix in the premixing tank according to the mass ratio of 98% sulfuric acid and titanium slag to 1.70, and pre-mix and stir for 40 minutes to make it a uniform titanium slag Sulfuric acid slurry;

[0035] B. After premixing, start the acidolysis tail gas treatment system, add 25wt% titanium slag sulfuric acid slurry to the acidolysis pot, add steam to preheat to 120°C, stop heating, and the titanium slag sulfuric acid slurry will react spontaneously. When the reaction temperature is 190°C, slowly add the remaining 75wt% of the materials at one time. After adding the remaining materials, the temperature of the acidolysis reaction system drops rapidly to 115°C, and then the temperature rises again. As the reaction progresses, the highest temperature is 193°C. Continue for 25 minutes from the completion of adding the remaining materials to the end of the acid hydrolysis reaction; ...

Embodiment 2

[0044] A. Grind the titanium slag with a ball mill until the residue on a 325-mesh sieve is 1.2%, pre-mix in the premixing tank according to the mass ratio of 98% sulfuric acid and titanium slag to 1.65, and pre-mix and stir for 35 minutes to make it a uniform titanium slag Sulfuric acid slurry;

[0045] B. After premixing, start the acidolysis tail gas treatment system, add 30wt% titanium slag sulfuric acid slurry to the acidolysis pot, add steam to preheat to 125°C, stop heating, and the titanium slag sulfuric acid slurry will react spontaneously. When the reaction temperature is 188°C, slowly add 42wt% titanium slag sulfuric acid slurry, the temperature of the acidolysis reaction system drops rapidly to 121°C, and then the temperature rises again. As the reaction progresses, when the system temperature rises to 185°C, add For the remaining 28wt% of the material, the temperature of the acidolysis reaction system dropped to 135°C again, and then the temperature of the reactio...

Embodiment 3

[0054] A. Grind the titanium slag with a ball mill until the residue on a 325-mesh sieve is 1.8%, pre-mix in the premixing tank according to the mass ratio of 98% sulfuric acid and titanium slag to 1.67, and pre-mix and stir for 45 minutes to make it a uniform titanium slag Sulfuric acid slurry;

[0055] B. After premixing, start the acidolysis tail gas treatment system, add 20wt% titanium slag sulfuric acid slurry to the acidolysis pot, add steam to preheat to 130°C, stop heating, and the titanium slag sulfuric acid slurry will react spontaneously. When the reaction temperature is 187°C, slowly add 40wt% titanium slag sulfuric acid slurry, the temperature of the acidolysis reaction system drops rapidly to 125°C, and then the temperature rises again. Add 32wt% titanium slag sulfuric acid slurry, the system temperature drops rapidly to 131°C, then the temperature rises again, as the reaction progresses, when the system temperature rises to 180°C, finally slowly add 8wt% titaniu...

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Abstract

The invention discloses a method for acid-decomposing titanium slag, which belongs to the technical field of preparing titanium dioxide by a sulfuric acid method. In order to fundamentally solve the technical problem of high sulfur content in tail gas in the current acidolysis process of titanium slag, the present invention provides a method for acidolysis of titanium slag, comprising: uniformly mixing titanium slag and sulfuric acid to obtain sulfuric acid slurry of titanium slag; Take 20wt%-40wt% titanium slag sulfuric acid slurry, preheat the steam to 110-130°C, stop heating, when the reaction temperature is 170-190°C, add the remaining titanium slag sulfuric acid slurry, and continue the acidolysis reaction; After completion, the acidolysis titanium solution is obtained through aging and leaching. The present invention suppresses the acidolysis reaction temperature by feeding in batches, reduces the maximum temperature of the acidolysis reaction of titanium slag, reduces the sulfur release amount in the acidolysis tail gas of titanium slag from the source, and controls the feeding ratio and acidolysis time at the same time. The acid hydrolysis rate of titanium slag remains at a relatively high level.

Description

technical field [0001] The invention belongs to the technical field of preparing titanium dioxide by a sulfuric acid method, and in particular relates to a method for acidolysis of titanium slag for reducing the sulfur content in the acidolysis tail gas of titanium slag in a sulfuric acid method titanium dioxide process. Background technique [0002] Due to titanium resource endowment, technology, equipment and other reasons, 95% of domestic enterprises use sulfuric acid method to produce titanium dioxide. Cleaning, quality improvement and consumption reduction are the main tasks faced by domestic sulfuric acid method titanium dioxide enterprises. Since the iron content in titanium slag is less, it is the fundamental way to reduce or eliminate the by-product greenite. More and more sulfuric acid titanium dioxide enterprises use titanium slag instead of titanium concentrate for production. The main components of the acidolysis tail gas after acidolysis of titanium slag or tit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/053
CPCC01G23/0532
Inventor 罗志强王海波杨仰军
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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