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A method for recovering titanium by centrifugal extraction from titanium white waste sulfuric acid

A waste sulfuric acid and titanium recovery technology, which is applied in the field of titanium recovery, can solve the problems of high price of neutral phosphorus-type extractants, long extraction time, and low extraction rate of titanium, and achieve short stripping time, short extraction time, and reverse extraction The effect of high extraction rate

Active Publication Date: 2018-11-23
CHUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the acidic extractant has a low extraction rate of titanium, only 40-60%, and the separation of titanium and iron is poor.
Neutral phosphorus-based extractants are more expensive, and the extraction time is 15-20 minutes, which takes a long time and costs a lot

Method used

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  • A method for recovering titanium by centrifugal extraction from titanium white waste sulfuric acid

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1) Sulfuric acid production of titanium dioxide waste sulfuric acid (component H 2 SO 4 : 22.2%, Ti: 7.6g / L, Fe: 0.05g / l, P: 0.001g / l, Si: 0.023g / l, Na: 0.016g / l), extractant: 25% N116+75% sulfur Petroleum oil, three-stage countercurrent extraction and centrifugal extraction at 32°C, compared to O:A=1:5, extraction time 10s, flow rate 40m 3 / h, the titanium in the sulfuric acid is extracted into the organic phase, and after the extraction, purified sulfuric acid (containing Ti≤80mg / L) and a titanium-rich organic phase are obtained.

[0029] 2) Wash the titanium-rich organic phase in a single-stage agitated storage tank, the washing liquid is 5% sulfuric acid (prepared with raffinate acid), compared with O:A=20:1, polyethylene storage tank 30m 3 , the rotation speed of the stirring blade is 150r / min, and the stirring time of each tank is 5min, and then the phase separation is static; the washing solution is replaced when Fe≥0.5g / l.

[0030] 3) Using 0.65mol / L ammonia ...

Embodiment 2

[0032] 1) Sulfuric acid production of titanium dioxide waste sulfuric acid (component H 2 SO 4 : 24.2%, Ti: 8.2g / L, Fe: 0.08g / l, P: 0.0008g / l, Si: 0.016g / l, Na: 0.01g / l), extractant: 30% N1923+70% sulfonium Petroleum oil, three-stage countercurrent extraction and centrifugal extraction at 26°C, compared to O:A=1:4, extraction time 7s, flow rate 35m 3 / h, the titanium in the sulfuric acid is extracted into the organic phase, and after the extraction, purified sulfuric acid (containing Ti≤50mg / L) and a titanium-rich organic phase are obtained.

[0033] 2) Wash the titanium-rich organic phase in a single-stage agitated storage tank, the washing solution is 7% sulfuric acid (prepared with raffinate acid), compared to O:A=18:1, polyethylene storage tank 20m 3 , the rotation speed of the stirring blade is 150r / min, and the stirring time of each tank is 7min, and then the phase separation is static; the washing solution is replaced when Fe≥0.5g / l.

[0034] 3) Using 0.65mol / L sodiu...

Embodiment 3

[0036] 1) Sulfuric acid production of titanium dioxide waste sulfuric acid (component H 2 SO 4 : 20.2%, Ti: 8.3g / L, Fe: 0.01g / l, P: 0.001g / l, Si: 0.02g / l, Na: 0.02g / l), with extractant: 35%Primene81R+65% Sulfonated kerosene, three-stage countercurrent extraction and centrifugal extraction at 28°C, compared to O:A=1:4, extraction time 9s, flow rate 40m 3 / h, the titanium in the sulfuric acid is extracted into the organic phase, and after the extraction, purified sulfuric acid (containing Ti≤50mg / L) and a titanium-rich organic phase are obtained.

[0037] 2) The titanium-rich organic phase is washed in a single stage with a stirring storage tank, and the washing liquid is 5% sulfuric acid (prepared with raffinate acid), compared with O:A=20:1, and the polyethylene storage tank is 30 m 3 , the speed of stirring paddle is 150r / min, and the stirring time of each tank is 8min after static phase separation; when the washing liquid Fe ≥ 0.5g / l, replace it.

[0038] 3) Using 0.7mol / L ...

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Abstract

The invention discloses a method for centrifugally extracting and recovering titanium from titanium white waste sulfuric acid. The method comprises the following steps: 1) primary amine centrifugally extracts titanium in waste sulfuric acid, and performs centrifugal extraction reaction with waste sulfuric acid produced by sulfuric acid method to produce titanium dioxide; 2) dilute sulfuric acid single-stage washes the titanium-rich organic phase, and 1) The extracted titanium-rich organic phase is single-stage washed in a container with stirring equipment, the washing liquid is dilute sulfuric acid with a mass concentration of 5-10%, and the phases are separated after single-stage washing; 3) The titanium-rich organic phase is centrifugally stripped , mixing the washed titanium-rich organic phase obtained in step 2) with lye with a concentration of 0.5-1 mol / L, and performing centrifugal stripping, and stripping the titanium-rich organic phase to obtain a titanium-containing solution and a blank organic phase. The method of the present invention does not need a synergistic extraction agent, and the cost is low, and the single-stage washing process of the titanium-rich organic phase is added, which can reduce the iron content in the titanium-rich organic phase, and the titanium-rich organic phase is centrifugally stripped with lye, The stripping time is short and the stripping rate is high.

Description

technical field [0001] The invention relates to the technical field of hydrometallurgy, in particular to a method for recovering titanium from waste acid produced by producing titanium dioxide by a sulfuric acid process by adopting primary amine centrifugal extraction. Background technique [0002] Titanium dioxide is an important inorganic chemical raw material, widely used in coatings, plastics, paper, chemical fiber, rubber, electronics, cosmetics and other fields. [0003] The production methods of titanium dioxide mainly include sulfuric acid method and chlorination method. Due to the simple and reliable process of sulfuric acid method, the requirements for raw materials are not strict. At present, 95% of titanium dioxide in my country is produced by sulfuric acid method. Although the sulfuric acid process is simple and reliable, the amount of three wastes is large. To produce 1t of titanium dioxide, its by-product can reach 8-10t of hydrolyzed sulfuric acid with a conc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B3/28C22B34/12
CPCC22B7/006C22B34/1259C22B3/28Y02P10/20
Inventor 陈亚西朱文彬郑娇玲黄雪琛高丽苹
Owner CHUZHOU UNIV
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