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Method for comprehensively utilizing titanium white waste acid

A technology of titanium white waste acid and sulfuric acid, which is applied in the direction of titanium dioxide, process efficiency improvement, titanium oxide/hydroxide, etc., can solve the problems of high energy consumption and large exhaust gas emissions, and achieve reduction of energy consumption and material consumption, The effect of reducing emissions and increasing added value

Active Publication Date: 2014-12-03
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Vanadium and titanium are the advantageous resources in Sichuan Province. At present, the production of vanadium mainly uses the vanadium slag from converter blowing as the raw material, which is roasted first and then leached. This kind of method has the disadvantages of high energy consumption and large exhaust gas emissions.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The method for comprehensive utilization of titanium dioxide waste acid comprises the following steps:

[0037] Step 1: Mix the waste titanium dioxide acid with the crushed and finely ground converter vanadium slag evenly, introduce oxygen for stirring and leaching to obtain leaching pulp, and separate to obtain leaching liquid and leaching slag, vanadium, iron, scandium, manganese, chromium and iron Enter the leaching solution, the main components of the leaching slag are silicon dioxide and titanium dioxide, of which: the particle size range of the broken and finely ground converter vanadium slag is: 0.1~150um, the leaching temperature is 110°C, the leaching time is 180min, the liquid-solid ratio is 5:1, and the stirring Speed ​​800rpm, oxygen partial pressure 1.4Mpa;

[0038] Step 2: Use extraction and back extraction to separate vanadium, scandium and other elements in the leachate:

[0039] Step 2.1: select P204 as extractant, sulfonated kerosene as diluent, carry o...

Embodiment 2

[0045] The method for comprehensive utilization of titanium dioxide waste acid comprises the following steps:

[0046] Step 1: Mix titanium dioxide waste acid with crushed and finely ground converter vanadium slag evenly, introduce oxygen for stirring and leaching, vanadium, iron and scandium in converter vanadium slag enter the leaching solution, and the main component of the leaching slag is silicon dioxide , wherein: the particle size range of the broken and finely ground converter vanadium slag is: 0.1-150um, the leaching temperature is 200°C, the leaching time is 30min, the liquid-solid ratio is 15:1, the stirring speed is 200rpm, and the oxygen partial pressure is 0.4Mpa;

[0047] Step 2: Use extraction to separate vanadium, iron and scandium elements in the leach solution:

[0048] Step 2.1: Select P204 as the extraction agent, sulfonated kerosene as the diluent, and carry out 9 stages of extraction, wherein the extraction conditions of each stage are: the initial pH of...

Embodiment 3

[0054] The method for comprehensive utilization of titanium dioxide waste acid comprises the following steps:

[0055] Step 1: Mix titanium dioxide waste acid with crushed and finely ground converter vanadium slag evenly, introduce oxygen for stirring and leaching, vanadium, iron and scandium in converter vanadium slag enter the leaching solution, and the main component of the leaching slag is silicon dioxide , wherein: the particle size range of the broken and finely ground converter vanadium slag is: 0.1-150um, the leaching temperature is 130°C, the leaching time is 90min, the liquid-solid ratio is 7:1, the stirring speed is 500rpm, the oxygen partial pressure is 0.7Mpa, vanadium and scandium enter the organic Mutually;

[0056] Step 2: Use extraction and back extraction to separate vanadium, iron and scandium elements in the leach solution:

[0057] Step 2.1: Select P204 as the extractant, sulfonated kerosene as the diluent, and carry out 5-stage extraction, wherein the ex...

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Abstract

The invention discloses a method for comprehensively utilizing titanium white waste acid, and belongs to the field of waste treatment. According to the method, waste acid produced by the titanium white industry is used as a raw material, valuable metal elements such as vanadium are extracted from converter vanadium slag by adopting a pressure acid leaching manner, namely a pressure leaching process is performed after the titanium white waste acid is mixed with the crushed and ground converter vanadium slag, valuable elements such as vanadium and scandium in the converter vanadium slag enter a leachate in the pressure leaching process, and the metal elements such as vanadium and scandium are respectively extracted from the leachate after the leachate is extracted and separated; the main component of the leaching slag is silicon dioxide, the leachate is neutralized by lime to serve as a raw material for cement industry or used for preparing silicon carbide in a reduction manner; and SO2 and SO3 are recovered from the raffinate in a manner of direct pyrolysis, and main solid-phase components obtained by pyrolysis include chromium oxide, manganese oxide and iron oxide which can be used as raw materials for smelting alloy. By virtue of the method, efficient utilization of the valuable elements in the titanium white waste acid and the converter vanadium slag can be realized, and the method is an environment-friendly method for comprehensively utilizing the titanium white waste acid.

Description

technical field [0001] The invention belongs to the field of waste treatment, in particular to a method for comprehensive utilization of titanium white waste acid. Background technique [0002] More than 90% of titanium ore in the world is used to produce titanium dioxide, and the sulfuric acid method is one of the main production methods. The biggest problem of this method is the large amount of waste acid discharge. According to statistics, to produce 1 ton of titanium dioxide, 8 to 10 tons of waste acid with a concentration of about 20% must be discharged. However, the annual production of waste sulfuric acid with this concentration in China's titanium dioxide industry reaches 6 million tons. The quantity is huge, and direct discharge will seriously pollute the environment. [0003] In domestic sulfuric acid titanium dioxide enterprises, the treatment methods of titanium dioxide waste acid mainly include vacuum concentration, lime neutralization, and leaching of phosphate...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B59/00C22B34/22C01B33/12C01G23/053
CPCY02P10/20
Inventor 张廷安吕国志刘燕张国权刘卓林豆志河赵秋月
Owner NORTHEASTERN UNIV
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