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 blo

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0035] Example 1

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

[0037] Step 1: Mix the titanium dioxide waste acid with the crushed and finely ground converter vanadium slag, and then pass in oxygen for stirring and leaching to obtain the leaching slurry. After separation, the leaching solution and the leaching residue, vanadium, iron, scandium, manganese, chromium and iron are obtained. Into the leaching solution, the main components of the leaching slag are silicon dioxide and titanium dioxide. The particle size range of the crushed and finely ground converter vanadium slag is: 0.1~150um, leaching temperature 110℃, leaching time 180min, liquid-solid ratio 5:1, 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 the extractant, sulfonated kerosene as the diluent,...

Example Embodiment

[0044] Example 2

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

[0046] Step 1: Mix the titanium dioxide waste acid with the crushed and finely ground converter vanadium slag evenly, and then pass in oxygen for stirring and leaching. The vanadium, iron and scandium in the converter vanadium slag enter the leaching solution, and the main component of the leaching slag is silica , Among them: the size range of the converter vanadium slag after crushing and fine grinding: 0.1~150um, leaching temperature 200℃, leaching time 30min, liquid-solid ratio 15:1, stirring speed 200rpm, oxygen partial pressure 0.4Mpa;

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

[0048] Step 2.1: Select P204 as the extractant and sulfonated kerosene as the diluent, and carry out 9 levels of extraction. The extraction conditions of each level are: the initial pH of the leachate is 0.5, the v...

Example Embodiment

[0053] Example 3

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

[0055] Step 1: Mix the titanium dioxide waste acid with the crushed and finely ground converter vanadium slag evenly, and then pass in oxygen for stirring and leaching. The vanadium, iron and scandium in the converter vanadium slag enter the leaching solution, and the main component of the leaching slag is silica , Among them: the particle size of the converter vanadium slag after crushing and fine grinding is: 0.1~150um, leaching temperature 130℃, leaching time 90min, liquid-solid ratio 7:1, stirring speed 500rpm, oxygen partial pressure 0.7Mpa, vanadium and scandium enter the organic phase;

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

[0057] Step 2.1: Choose P204 as the extractant and sulfonated kerosene as the diluent, and perform 5 levels of extraction. The extraction conditions of each ...

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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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