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Method for extracting scandium from scandium enrichment

A technology of enrichment and hydroxide, which is applied in the direction of improving process efficiency, can solve the problems of high process cost, difficult extraction, and failure to make great progress, and achieve low roasting temperature, cost reduction, and strong industrial application value effect

Inactive Publication Date: 2013-07-24
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the fact that scandium in the Baiyan Obo Mine mainly occurs in silicate minerals, it is difficult to extract it, and no great progress has been made so far.
Predecessors have also done a lot of research on the extraction of scandium in Baiyun Obo, such as the patent application number 201210131201.6, which studies the extraction method of scandium in the tailings of Baiyun Obo, but it has not been used in actual production. The main reason is that Failure to consider from the perspective of comprehensive utilization of resources, the process cost is too high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Alkali-added roasting: Take 100g of Baiyan Obo tailings, whose -100 mesh accounts for more than 90% and the weight content of scandium is 0.028%, add 150g of sodium hydroxide and mix well, and roast at a temperature of 350°C. The time is 2 hours;

[0023] (2) Washing: Use ordinary industrial water to wash the roasted and decomposed minerals until the pH value of the washing liquid is 7 to obtain washing liquid and washing residue; the washing temperature is 25°C;

[0024] (3) Hydrochloric acid leaching: leaching the washed slag with hydrochloric acid, the concentration of hydrochloric acid is 6mol / L, the dosage of hydrochloric acid is 1000ml, the leaching temperature is 85°C, and the time is 3 hours, to obtain hydrochloric acid leaching solution and hydrochloric acid leaching residue, the leaching solution is scandium-containing solution. The leaching rate was 89%.

Embodiment 2

[0026] (1) Alkali-added roasting: take 100g of Baiyan Obo tailings, whose -100 mesh accounts for more than 90% and the weight content of scandium is 0.038%, add 130g of sodium hydroxide and mix well, and roast at a temperature of 400°C. The time is 1 hour;

[0027] (2) Washing: Use ordinary industrial water to wash the roasted and decomposed minerals until the pH value of the washing liquid is 7 to obtain washing liquid and washing residue; the washing temperature is 25°C;

[0028] (3) Hydrochloric acid leaching: leaching the washing residue with hydrochloric acid, the concentration of hydrochloric acid is 6mol / L, the dosage of hydrochloric acid is 1200ml, the leaching temperature is 95°C, and the time is 2 hours to obtain hydrochloric acid leaching solution and hydrochloric acid leaching residue, the leaching solution is scandium-containing solution. The leaching rate was 86%.

Embodiment 3

[0030] (1) Alkali-added roasting: take 100g of Baiyun Obo tailings with a scandium content of 0.042%, add 100g of caustic soda and mix well, and perform thermal decomposition. The temperature of thermal decomposition is 380°C, and the time is 1 hour;

[0031] (2) Washing: Use ordinary industrial water to wash and filter the roasted and decomposed minerals, and wash the filter cake several times until the pH of the washing liquid is 7; the washing temperature is 65°C;

[0032] (3) Hydrochloric acid leaching: The Baiyan Obo ore decomposed by adding alkali and roasting is leached with hydrochloric acid. Filter, and wash the filter cake once with 400ml hydrochloric acid to obtain hydrochloric acid leaching solution and hydrochloric acid leaching residue, the leaching rate is 81%.

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Abstract

The invention discloses a method for extracting scandium from scandium enrichment. The method comprises the steps of: firstly, mixing over 90% of 100-mesh scandium enrichment with an alkali metal hydroxide by a weight ratio of 1:(0.6-1.8) to obtain a mixture; roasting the mixture at the temperature of 300-650 DEG C to obtain a roasted ore; washing the roasted ore to a pH value of 7-9 with water, wherein the water washing liquid is used for recovering hydroxides of silicon, aluminum and alkali metal; leaching out water washing residues by hydrochloric acid; and filtering to obtain leached residues used as raw materials for recovering the silicon, wherein a leachate is a scandium-containing coarse solution and used as a raw material for further extracting scandium. The method is simple and scientific in technology, capable of effectively leaching and extracting scandium from the scandium enrichment prepared by baiyuneboite or tailings of the baiyuneboite, and high in leaching rate; in addition, other byproducts can be recovered in the technology; and the method can be used for comprehensively recovering the rare dispersive element scandium from the tailings of baiyuneboite.

Description

[0001] technical field [0002] The invention relates to a method for extracting scandium from scandium enrichment, belonging to the field of hydrometallurgy. Background technique [0003] Since the 1980s, people have found that the addition of scandium can greatly improve and enhance the performance of some materials, especially in some high-end technologies, such as aerospace, etc., which greatly increases the demand for scandium performance research and practical applications . [0004] However, because scandium is extremely dispersed in nature, the method of directly extracting scandium from scandium-rich ores is difficult to put into practical production, and the output of scandium is greatly limited, which is already in a bottleneck state. Therefore, for a long period of time in the future, there will still be a large gap in the demand for scandium. If a new way to produce scandium in large quantities can be found, it will greatly improve the research and practical ap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B3/10C22B59/00
CPCY02P10/20
Inventor 李梅张栋梁胡德志郭财胜周富强柳召刚高凯
Owner INNER MONGOLIA UNIV OF SCI & TECH
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