Method for comprehensively recovering scandium and titanium by leaching red mud with titanium white waste acid

A titanium white waste acid and leaching technology, which is applied in the field of hydrometallurgy, can solve problems that cannot be put into industrial practice, and achieve the effect of cost reduction, low cost and simple process

Inactive Publication Date: 2014-08-27
广西冶金研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The sintering process red mud has been utilized to varying degrees, and for the Bayer process red mud, although many effective schemes have been proposed, due to technical and economic reasons. The vast majority failed to put into industrial practice

Method used

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  • Method for comprehensively recovering scandium and titanium by leaching red mud with titanium white waste acid

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The method for comprehensively recovering scandium and titanium by leaching red mud with titanium dioxide waste acid according to the present invention comprises the following steps:

[0030] The red mud was obtained from Guangxi Pingguo Aluminum Industry Co., Ltd., and the waste titanium dioxide acid was obtained from Guangxi Jinmao Titanium Industry Co., Ltd.

[0031] Add 60L of titanium white waste acid solution with a concentration of 1.0mol / L into a 100L reaction tank, gradually add 13kg of red mud under stirring, the reaction temperature is 75°C, and the reaction time is 30 minutes. The leached slurry is filtered and washed by a filter press to obtain primary leaching residue and leaching liquid. Sc in leachate 2 o 3 Content 29mg / L, TiO 2 The content is 6.8g / L.

[0032] The leaching residue was leached twice with waste acid with a concentration of 3.5mol / L, and the primary leaching residue was gradually added under stirring, the reaction temperature was contro...

Embodiment 2

[0041] The method for comprehensively recovering scandium and titanium by leaching red mud with titanium dioxide waste acid according to the present invention comprises the following steps:

[0042] The red mud was obtained from Guangxi Pingguo Aluminum Industry Co., Ltd., and the waste titanium dioxide acid was obtained from Guangxi Jinmao Titanium Industry Co., Ltd.

[0043]Add 60L of titanium white waste acid solution with a concentration of 1.5mol / L into a 100L reaction tank, gradually add 13kg of red mud under stirring, the reaction temperature is 50°C, and the reaction time is 60 minutes. The leached slurry is filtered and washed by a filter press to obtain primary leaching residue and leaching liquid. Sc in leachate 2 o 3 Content 35mg / L, TiO 2 The content is 9g / L.

[0044] The leaching residue was leached twice with waste acid with a concentration of 4.0mol / L, and the primary leaching residue was gradually added under stirring, the reaction temperature was controlle...

Embodiment 3

[0053] The method for comprehensively recovering scandium and titanium by leaching red mud with titanium dioxide waste acid according to the present invention comprises the following steps:

[0054] The red mud was obtained from Guangxi Pingguo Aluminum Industry Co., Ltd., and the waste titanium dioxide acid was obtained from Guangxi Jinmao Titanium Industry Co., Ltd.

[0055] Add 60L of titanium white waste acid solution with a concentration of 1.8mol / L into a 100L reaction tank, gradually add 13kg of red mud under stirring, the reaction temperature is 100°C, and the reaction time is 60 minutes. The leached slurry is filtered and washed by a filter press to obtain primary leaching residue and leaching liquid. Sc in leachate 2 o 3 Content 40mg / L, TiO 2 The content is 9g / L.

[0056] The leaching residue was leached twice with waste acid with a concentration of 5.0mol / L, and the primary leaching residue was gradually added under stirring, the reaction temperature was control...

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Abstract

The invention relates to a method for comprehensively recovering scandium and titanium by leaching red mud with titanium white waste acid, which comprises the following steps: at ordinary pressure, dipping red mud with titanium white waste acid having a liquid-to-solid ratio of 4.0-6.0, performing secondary acid dipping on the leached slag, dealkalizing the secondary acid dipping slag, further performing strong magnetic separation to obtain iron-containing ores and tailings, and performing secondary strong magnetic separation on the iron-containing ores to obtain iron concentrated ores and middlings; extracting the leaching solution, performing back extraction, dissolving in acid to perform hydrolysis, performing secondary extraction, removing impurities, performing secondary back extraction, dissolving in hydrochloric acid, adding oxalic acid to precipitate, and calcining to obtain a scandium oxide product; dissolving the back extraction slag in sulfuric acid, and performing hydrolysis under the conditions of heating and boiling for 2-3 hours, thus obtaining metatitanic acid; and drying the metatitanic acid, calcining, and pulverizing to obtain titanium yellow powder. The invention realizes the combined treatment of titanium white waste acid and red mud, treats wastes with wastes, changes wastes into valuable substances, comprehensively recycles the two major pollution sources (i.e. titanium white waste acid and red mud), and mainly recovers the iron ores, titanium and rare noble metal scandium in the pollution sources.

Description

technical field [0001] The invention relates to a method for comprehensively recovering scandium and titanium by leaching red mud with titanium dioxide waste acid, and belongs to the technical field of hydrometallurgy. Background technique [0002] At present, the vast majority of titanium dioxide manufacturers in my country use the traditional production process of sulfuric acid method. For each ton of titanium dioxide produced, 8-10 tons of waste acid with a concentration of 15-20% is produced, and the scandium content is 10-20%. 30mg / L, with recycling value. The existing treatment of titanium dioxide waste acid mainly uses neutralization discharge, concentration and reuse, and production of sulfates. These methods are either expensive or cause serious secondary pollution, and fail to fundamentally solve the outlet problem of waste acid. [0003] In addition to iron, aluminum, sodium, calcium and other metal elements, red mud also contains a variety of valuable components ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/06C22B3/26C22B59/00C22B34/12
Inventor 郭旦奇何航军杨国高陈均宁樊艳金詹海鸿梁焕龙李伯骥满露梅张建飞容继柯剑华陶媛
Owner 广西冶金研究院有限公司
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