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Method for recovering valuable elements from chlorination-process titanium dioxide waste acid through sectional extraction

A technology of titanium dioxide waste acid and valuable elements, applied in the field of metallurgy, can solve problems such as resource waste and environmental pollution, and achieve the effect of avoiding waste and improving the value of waste acid

Active Publication Date: 2021-03-02
河南荣佳钪钒科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This waste hydrochloric acid solution is usually first neutralized by milk of lime, and discarded after producing a large amount of slag phase, which not only causes a large amount of waste of resources, but also seriously pollutes the environment; because waste acid contains a large amount of iron, manganese, aluminum and a small amount of Titanium, zirconium, niobium, scandium, vanadium and other elements; the value of its valuable elements is very high, it is necessary to study a method to comprehensively recover the valuable elements in waste acid, while reducing the discharge of waste water and residue, which is conducive to environmental protection

Method used

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  • Method for recovering valuable elements from chlorination-process titanium dioxide waste acid through sectional extraction

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Embodiment 1

[0033] Embodiment 1, as figure 1 As shown, this embodiment discloses a method for segmental extraction and recovery of valuable elements by chlorination titanium dioxide waste acid, including the following steps:

[0034] S1. Hydrogen peroxide is added to the waste acid of titanium white by the chlorination method, and the iron oxide operation is performed. The oxidation terminal potential is 710mv, and then the iron extraction operation is performed with 50% N235+10% 2-octanol+40% solvent oil, and the extraction is compared to O / A =3:1, the first extraction raffinate and iron load are obtained after phase separation; the iron-loaded organic phase is stripped with 50-degree water, and the stripping ratio O / A=6:1 is obtained to obtain a ferric chloride solution .

[0035] S2. Add 20% P204+5%TBP+75% solvent oil to the first raffinate to extract scandium, titanium, zirconium and niobium. The extraction ratio is O / A=1:10, and the second raffinate is obtained after phase separatio...

Embodiment 2

[0043] Embodiment 2, as figure 1 As shown, this embodiment discloses a method for segmental extraction and recovery of valuable elements by chlorination titanium dioxide waste acid, including the following steps:

[0044] S1. Sodium hypochlorite is added to the waste acid of titanium white by the chlorination method, and the iron oxide operation is performed. The oxidation terminal potential is 800mv, and then the iron extraction operation is performed with 40% N235+12% 2-octanol+48% solvent oil, and the extraction is compared to O / A =2:1, the first extraction raffinate and the iron-loaded organic phase are obtained after phase separation; the iron load is stripped with 60-degree water, and the stripping ratio O / A=4:1 is obtained to obtain a ferric chloride solution ;

[0045]S2. Add 20% P272+5%TBP+75% solvent oil to the first raffinate to extract scandium, titanium, zirconium and niobium. The extraction ratio is O / A=1:40, and the second raffinate is obtained after phase sepa...

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Abstract

The invention discloses a method for recovering valuable elements from chlorination-process titanium dioxide waste acid through sectional extraction. The method comprises the following steps: S1, adding a first organic phase into the chlorination-process titanium dioxide waste acid to obtain a first extraction raffinate and an iron load, and carrying out back extraction on the iron load to obtaina ferric chloride solution; S2, adding a second organic phase into the first extraction raffinate to obtain second extraction raffinate and a scandium-titanium-zirconium-niobium load; S3, carrying outback extraction on the scandium load to obtain a scandium-titanium-zirconium-niobium enriched product; S4, adjusting the pH value of the second extraction raffinate to prepare a liquid; S5, adding athird organic phase after liquid preparation to obtain a vanadium-aluminum load and a third extraction raffinate; S6, carrying out back extraction on the vanadium-aluminum load to obtain a vanadium-aluminum mixed solution; S7, adjusting the pH value of the third extraction raffinate to prepare a liquid; S8, after liquid preparation, adding a fourth organic phase into manganese extraction feed liquid to obtain a manganese load and a fourth extraction raffinate, and carrying out back extraction on the manganese load to obtain a manganese-containing solution; and S9, neutralizing the fourth extraction raffinate, carrying out filtering, then performing concentrating and crystallizing to obtain NaCl edible salt and water, and recycling the NaCl edible salt and water.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a method for segmentally extracting and recovering valuable elements from titanium white waste acid in a chlorination process. Background technique [0002] Titanium dioxide is an important chemical raw material, which is widely used in various important industrial fields that affect the national economy. In the production of titanium dioxide by boiling chlorination process, every ton of titanium dioxide produced will produce 0.4-0.6m 3 Spent hydrochloric acid solution. This waste hydrochloric acid solution is usually first neutralized by milk of lime, and discarded after producing a large amount of slag phase, which not only causes a large amount of waste of resources, but also seriously pollutes the environment; because waste acid contains a large amount of iron, manganese, aluminum and a small amount of Titanium, zirconium, niobium, scandium, vanadium and other elements; the value ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/10C01G31/00C01G45/10C01D3/08C22B7/00C22B59/00C22B47/00C22B21/00C22B34/22C02F9/10C02F103/34
CPCC01G49/10C01G49/0009C01G31/003C01G45/10C01G45/003C01D3/08C02F9/00C22B7/006C22B59/00C22B47/00C22B21/0023C22B34/22C02F1/722C02F1/76C02F1/26C02F1/66C02F1/001C02F1/02C02F2103/34Y02P10/20
Inventor 陈卫平聂东红彭业云李润民薛攀程长鑫司利沙
Owner 河南荣佳钪钒科技有限公司
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