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A method for comprehensive recovery of useful metals from red mud

A kind of red mud, a useful technology, applied in the field of non-ferrous metallurgy, can solve the problems of high reduction roasting temperature, low scandium enrichment efficiency, large acid and alkali consumption, etc., and achieve the effect of reducing energy consumption, temperature and cost

Active Publication Date: 2018-07-27
CHANGSHA ZISHENG ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are some substantial defects in this method: 1) its reduction roasting temperature is relatively high, up to about 1100°C, and its energy consumption is relatively high; Gradually enriched to obtain scandium-containing enriched slag, the enrichment efficiency of scandium is low, and the enrichment of scandium is enriched from 86ppm of red mud to 415ppm, which is only about 5 times enriched

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  • A method for comprehensive recovery of useful metals from red mud

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Comparison scheme
Effect test

Embodiment 1

[0037] 100kg of red mud (containing scandium 92g / t) is ground to -325 mesh, passed through 80%, mixed with 10kg NaOH and 20kg of lignite, and then roasted. The roasting temperature is 800°C, and the roasting time is 3 hours. After roasting, the mass ratio of roasted materials is 1:1 Add water, ball mill to 200 mesh and pass 95%. After filtration, the filtrate is sodium aluminate. The filter residue is magnetically separated by an 800Gs magnetic separator. The sulfuric acid solution was mixed according to the mass ratio of 1:5; stirred in the reaction kettle and heated to 150°C, leached for 6 hours, filtered, and the filter residue was removed to obtain the filtrate; the pH value of the filtrate was adjusted to 5; Acid and boric acid, the molar ratio of mandelic acid and boric acid is 5:1; the mass ratio of scandium precipitation agent to filtrate is 1:10, and the temperature is 60°C. The weight of the filtered residue was 128g, the scandium content was 5.36%, and the recovery ...

Embodiment 2

[0041]100kg of red mud (containing scandium 92g / t) is ground to -325 mesh, passed through 80%, mixed with 8kg NaOH and 16kg of lignite, and then roasted. The roasting temperature is 850°C, and the roasting time is 4 hours. After roasting, the mass ratio of roasted materials is 1:1 Add water, ball mill to 200 mesh and pass 95%. After filtration, the filtrate is sodium aluminate. The filter residue is magnetically separated by a 700Gs magnetic separator. The sulfuric acid solution was mixed according to the mass ratio of 2:5; stirred in the reactor and heated to 160°C, leached for 5 hours, filtered, and the filter residue was removed to obtain the filtrate; the pH value of the filtrate was adjusted to 5; Acid and boric acid, the molar ratio of mandelic acid and boric acid is 6:1; the mass ratio of scandium precipitation agent to filtrate is 1:10, and the temperature is 70°C. The weight of the filtered residue was 135g, the content of scandium was 4.78%, and the recovery rate of ...

Embodiment 3

[0045] 100kg of red mud (containing scandium 92g / t) is ground to -325 mesh, passed through 80%, mixed with 9kg NaOH and 18kg of lignite, and then roasted. The roasting temperature is 850°C, and the roasting time is 4 hours. After roasting, the mass ratio of roasted materials is 1:1 Add water, ball mill to 200 mesh and pass 95%. After filtration, the filtrate is sodium aluminate. The filter residue is magnetically separated by an 800Gs magnetic separator. The sulfuric acid solution was mixed according to the mass ratio of 1.5:5; stirred in the reaction kettle and heated to 170°C, leached for 4.5 hours, filtered, and the filter residue was removed to obtain the filtrate; the pH value of the filtrate was adjusted to 5.5; Acid and boric acid, the molar ratio of mandelic acid and boric acid is 5.5:1; the mass ratio of scandium precipitation agent to filtrate is 1:5, and the temperature is 75°C. The weight of the filtered residue was 127g, the scandium content was 5.31%, and the rec...

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Abstract

The invention discloses a method for comprehensive recovery of valuable metals from red mud. According to the method, after the red mud, an alkali thickening agent and a reducing agent are subjected to reducing roasting, aluminum is leached, the slag phase is subjected to magnetic separation for recovery of iron, scandium is leached through an acid solution, a scandium leaching liquid is processed with a composite scandium precipitation agent comprising mandelic acid and boric acid for scandium precipitation, and a scandium-containing product is obtained. With the method, comprehensive recovery of the scandium, the iron and the aluminum is realized, particularly, the scandium is efficiently enriched, compared with a traditional scandium extraction technology, the method has the characteristics of being simple, low in cost and free of secondary pollution, a new path is provided for the existing technology for extracting the scandium from the red mud, and the method is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to a treatment method of red mud, in particular to a method for extracting and recovering scandium, iron, aluminum and other metals from red mud, and belongs to the technical field of nonferrous metallurgy. Background technique [0002] Scandium is known as a strategic element in the new century. It is widely used in the fields of national defense, metallurgy, chemical industry, glass, aerospace, nuclear technology, laser, electronics, computer power supply, superconductivity and medicine, and scandium resources are limited. [0003] A large amount of waste red mud is generated in the alumina production process. Red mud is a kind of red, powdery mud-like strong alkali solid waste with high water content left after the aluminum industry extracts aluminum from alumina. The composition of red mud is complex and alkaline. The red mud is too fine, and most of the domestic red mud storage yards use the storage yard wet storage method...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B21/00C22B59/00
CPCC22B7/007C22B21/0023C22B59/00Y02P10/20
Inventor 黎方正彭宇
Owner CHANGSHA ZISHENG ENVIRONMENTAL PROTECTION TECH CO LTD