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Intermittent acidolysis method and device for titanium slag

A technology of titanium slag and acid hydrolysis, which is applied in chemical instruments and methods, titanium and titanyl sulfate, titanium dioxide, etc., can solve the problems of low utilization level of waste acid, high main reaction temperature, and difficult treatment, and achieves the reduction of Risk of pot, lower reaction temperature, mild reaction and thorough effect

Active Publication Date: 2021-09-28
PANGANG GROUP RESEARCH INSTITUTE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the acid hydrolysis rate of titanium slag in the prior art is about 93%, and there is still a large room for improvement
[0004] In addition, the utilization level of waste acid produced by sulfuric acid production of titanium dioxide is low, and the cost of neutralizing it is high. At the same time, the amount of titanium gypsum produced by neutralization is large and difficult to handle
In addition, in the acidolysis process of titanium slag, there is a safety problem that it is easy to leak, and the acidolysis reaction of titanium slag is rapid, and the main reaction temperature of the acidolysis reaction is high, which makes the sulfur content in the tail gas high and the treatment is difficult.

Method used

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  • Intermittent acidolysis method and device for titanium slag
  • Intermittent acidolysis method and device for titanium slag
  • Intermittent acidolysis method and device for titanium slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] First, calculate the consumption of 98% concentrated sulfuric acid and 20% initiated waste acid respectively according to acid slag ratio 1.66, 92% acid concentration after mixing 20% ​​initiated waste acid and 98% concentrated sulfuric acid;

[0069]After that, first add corresponding amount of 98% concentrated sulfuric acid into the premixing pot, start the stirring of the premixing tank, then slowly add corresponding amount of titanium slag powder according to the acid residue ratio of 1.66, the premixing time is 30-60min, the premixing temperature Control below 40°C;

[0070] Afterwards, the first mixture obtained by premixing is put into the acidolysis pot, feeds compressed air into the acidolysis pot, after the first mixture discharge is completed, add 20% of corresponding amount to initiate spent acid (temperature is Just above normal temperature, no need to preheat), open the steam valve of the acid hydrolysis pot to feed steam, the steam pressure is 0.2Mpa;

...

Embodiment 2

[0076] First, calculate the consumption of 98% concentrated sulfuric acid and 20% initiated waste acid respectively according to acid slag ratio of 1.70, 20% initiated waste acid and 92% acid concentration after mixing with 98% concentrated sulfuric acid;

[0077] Afterwards, first add corresponding amount of 98% concentrated sulfuric acid into the premixing pot, start the stirring of the premixing tank, then slowly add corresponding amount of titanium slag powder according to the acid residue ratio of 1.70, the premixing time is 30-60min, the premixing temperature Control below 40°C;

[0078] Afterwards, the first mixture obtained by premixing is put into the acidolysis pot, feeds compressed air into the acidolysis pot, after the first mixture discharge is completed, add 20% of corresponding amount to initiate spent acid (temperature is Just above normal temperature, no need to preheat), open the steam valve of the acid hydrolysis pot to feed steam, the steam pressure is 0.2M...

Embodiment 3

[0084] First, calculate the consumption of 98% concentrated sulfuric acid and 50% initiated waste acid respectively according to acid slag ratio 1.66, 50% initiated waste acid (concentrated acid) mixed with 98% concentrated sulfuric acid acid concentration 92%;

[0085] After that, first add corresponding amount of 98% concentrated sulfuric acid into the premixing pot, start the stirring of the premixing tank, then slowly add corresponding amount of titanium slag powder according to the acid residue ratio of 1.66, the premixing time is 30-60min, the premixing temperature Control below 40°C;

[0086] At the same time, 50% of the initiated waste acid was indirectly preheated to a temperature of 47.6°C through steam;

[0087] Afterwards, the first mixture obtained by premixing is put into the acidolysis pot, and compressed air is passed into the acidolysis pot. Acid, open the steam valve of the acid hydrolysis pot to feed steam, the steam pressure is 0.2Mpa;

[0088] When the t...

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Abstract

The invention discloses an intermittent acidolysis method and device for titanium slag. The method comprises the following steps: mixing titanium slag powder with concentrated sulfuric acid according to a preset proportion to obtain a first mixture; placing the first mixture in a reactor, adding a predetermined amount of initiating waste acid into the reactor, and introducing steam to initiate a main reaction; after the main reaction is finished, curing to obtain an acidolysis product; and leaching the acidolysis product to obtain a titanium solution. According to the intermittent acidolysis method and device for the titanium slag, the recycling amount of waste acid can be increased, titanium gypsum is reduced, the titanium liquid quality is improved, the treatment cost is reduced, and the product quality is improved; the titanium slag acidolysis reaction can be milder and more thorough, so that the safety is ensured, the titanium slag acidolysis rate is increased, and the sulfur content of tail gas is reduced.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a method and device for intermittent acidolysis of titanium slag. Background technique [0002] In the process of producing titanium dioxide by sulfuric acid method, the produced titanium gypsum and ferrous heptahydrate are difficult to handle. The mixed acid hydrolysis process of titanium slag and titanium ore to produce titanium dioxide can avoid the by-production of ferrous heptahydrate and reduce the amount of waste acid, and correspondingly reduce the amount of titanium gypsum produced by neutralizing the waste acid. [0003] The acid hydrolysis rate of titanium slag is one of the important economic and technical indicators to evaluate the pros and cons of titanium slag acid hydrolysis process, which directly affects the production cost and economic benefits of sulfuric acid titanium dioxide, so it is very important to improve the acid hydrolysis rate of titanium s...

Claims

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Application Information

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IPC IPC(8): C01G23/00C01G23/053
CPCC01G23/008C01G23/0532
Inventor 王海波王斌马维平吴小平
Owner PANGANG GROUP RESEARCH INSTITUTE CO LTD
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