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Method and system for recovering valuable metals from red mud

A valuable metal, red mud technology, applied in the chemical industry, can solve the problems of multi-yard construction and maintenance costs, process economy, large red mud stock, low economic value, etc. effect of value

Active Publication Date: 2018-07-13
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Red mud contains a large amount of iron, aluminum, sodium, calcium and other metals. The stockpiling of red mud not only takes up a lot of land and farmland, but also consumes a lot of yard construction and maintenance costs, causing serious water pollution and wasting a lot of waste. metal resources
Valuable metal components contained in red mud such as Fe 3 o 4 、Al 2 o 3 、Na 2 O, TiO 2 Most of them are base metals with low economic value. Recycling a certain element alone cannot solve the problems of process economy and huge red mud stockpile. It is necessary to use a combination of multiple metal recycling technologies to truly realize red mud. Comprehensive Utilization and Reduction of Mud

Method used

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  • Method and system for recovering valuable metals from red mud
  • Method and system for recovering valuable metals from red mud

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Red mud and reducing agent are mixed and proportioned, wherein TFe in red mud is 32.08wt%, CaO is 21.30wt%, SiO 2 is 18.21wt%, titanium dioxide content is 9.65wt%, scandium content is 86ppm, fixed carbon content in reducing agent is 75wt%, ash content is 6.97wt%, then the obtained mixed ingredients are rolled and mixed to obtain the mixed material, then the mixture The material is subjected to molding treatment to obtain mixed pellets (the molar ratio of carbon to oxygen is 1.0), and then the mixed pellets are subjected to reduction roasting treatment, and then the resulting mixed product containing granular iron and tailings is crushed and magnetically separated to obtain granular iron and tailings, wherein the iron content in granular iron is 96.1wt%, TFe in tailings is 5.12wt%, TiO 2 The Sc content is 20.12wt%, the Sc content is 98ppm, and then the tailings are acid-leached with hydrochloric acid to obtain the titanium-containing leaching residue and the scandium-con...

Embodiment 2

[0062] Red mud and reducing agent are mixed and proportioned, wherein TFe in red mud is 28.9wt%, CaO is 11.63wt%, SiO 2 is 10.89wt%, the content of titanium dioxide is 13.14wt%, the content of scandium is 120ppm, the content of fixed carbon in the reducing agent is 85wt%, and the ash content is 7.12wt%. The material is subjected to molding treatment to obtain mixed pellets (the molar ratio of carbon to oxygen is 1.2), and then the mixed pellets are subjected to reduction roasting treatment, and then the resulting mixed product containing granular iron and tailings is crushed and magnetically separated to obtain granular iron and tailings, wherein the iron content in granular iron is 95.22wt%, TFe in tailings is 5.55wt%, TiO 2 The Sc content is 26.01wt%, and the Sc content is 144ppm. Then, the tailings are subjected to acid leaching treatment with hydrochloric acid to obtain the leaching residue containing titanium and the leaching solution containing scandium. The leaching rat...

Embodiment 3

[0064] Red mud and reducing agent are mixed and proportioned, wherein TFe in red mud is 40.27wt%, CaO is 12.21wt%, SiO 2 is 13.51wt%, the content of titanium dioxide is 10.01wt%, the content of scandium is 92ppm, the content of fixed carbon in the reducing agent is 85wt%, and the ash content is 7.12wt%. The material is subjected to molding treatment to obtain mixed pellets (the molar ratio of carbon to oxygen is 1.3), and then the mixed pellets are subjected to reduction roasting treatment, and then the resulting mixed product containing granular iron and tailings is crushed and magnetically separated to obtain granular iron and tailings, wherein the iron content in granular iron is 94.56wt%, TFe in tailings is 6.02wt%, TiO 2 The Sc content is 21.36wt%, and the Sc content is 105ppm. Then, the tailings are subjected to acid leaching treatment with hydrochloric acid to obtain the titanium-containing leaching residue and the scandium-containing leaching solution, wherein the leac...

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Abstract

The invention discloses a method and system for recycling valuable metal from red mud. The method includes the steps that firstly, the red mud and a reducing agent are mixed for molding treatment so as to obtain mixed ball masses; secondly, the mixed ball masses are calcinated so as to obtain mixed products containing granular iron and tailings; thirdly, the mixed products containing the granular iron and the tailings are separated so as to obtain the granular iron and the tailings; fourthly, acid leaching is performed on the tailings through hydrochloric acid so as to obtain leaching slag containing titanium and leachate containing scandium; and fifthly, titanium is extracted from the leaching slag containing titanium. By the adoption of the method, iron, scandium and titanium in the red mud can be efficiently recycled step by step, so that the use value of the red mud is broadened.

Description

technical field [0001] The invention belongs to the field of chemical industry, in particular, the invention relates to a method and system for recovering valuable metals from red mud. Background technique [0002] Red mud is the waste produced in the process of refining alumina from bauxite, and it is named for its red mud. With the continuous development of the aluminum industry, the world currently produces about 60 million tons of red mud every year, and my country's red mud discharge is more than 4.5 million tons per year. Most alumina refineries in the world pile up or dump red mud into the deep sea. Red mud contains a large amount of iron, aluminum, sodium, calcium and other metals. The stockpiling of red mud not only takes up a lot of land and farmland, but also consumes a lot of yard construction and maintenance costs, causing serious water pollution and wasting a lot of waste. metal resources. Valuable metal components contained in red mud such as Fe 3 o 4 、Al...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00
CPCY02P10/20
Inventor 王敏古明远王欣刘占华曹志成薛逊吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST