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A method for extracting scandium by activated leaching of concentrated sulfuric acid from coal gangue

A technology of concentrated sulfuric acid and coal gangue, applied in the field of rare metal metallurgy, can solve the problems of high leaching rate, heavy workload, and environmental pollution, and achieve the effect of simple technical process, convenient operation, and environmental friendliness

Active Publication Date: 2022-02-18
云南方圆矿产资源再生综合利用研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has a high leaching rate and shortens the leaching time, but has the problems of large investment, environmental pollution, heavy workload, and large amount of leaching agent.

Method used

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  • A method for extracting scandium by activated leaching of concentrated sulfuric acid from coal gangue

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] a. Coal gangue contains scandium 50g / t, iron 6%, aluminum 26%, and titanium 6.4%. The gangue is crushed to -3mm, and it is ground with a wet ball mill until the particle size is less than 200 mesh, accounting for more than 98%;

[0023] b. Inject the pulverized coal gangue into the activation reactor, add concentrated sulfuric acid with a weight of 150% of the gangue, control the temperature at 150°C, and stir evenly for 2 hours;

[0024] c. Send the activated coal gangue to the stirring and leaching operation tank for water immersion at a liquid-solid ratio of 4:1, the operating temperature is 90°C, and the reaction time is 2h;

[0025] d. Liquid-solid separation of the ore pulp after leaching is completed, and the liquid phase is obtained as a solution containing scandium, iron, aluminum and titanium, and the solid is leaching slag containing silicon, and the leaching rate of scandium is 87.5%;

[0026] e. Heat up the solution containing scandium, titanium, iron, and ...

Embodiment 2

[0034] a. Coal gangue contains 45g / t scandium, 6.8% iron, 24.2% aluminum, and 7.4% titanium. Crush the gangue to -3mm, and grind it with a wet ball mill until the particle size is less than 200 mesh, accounting for more than 98%;

[0035] b. Inject the pulverized coal gangue into the activation reactor, add concentrated sulfuric acid with a weight of 150% of the gangue, control the temperature at 200°C, and stir evenly for 2 hours;

[0036] c. Send the activated coal gangue to the stirring and leaching operation tank for water immersion at a liquid-solid ratio of 4:1, the operating temperature is 90°C, and the reaction time is 2h;

[0037] d. The liquid-solid separation of the ore pulp after leaching is completed, and the liquid phase is obtained as a solution containing scandium, iron, aluminum and titanium, and the solid is leaching slag containing silicon, and the leaching rate of scandium is 86.1%;

[0038] e. Heat up the solution containing scandium, titanium, iron, and a...

Embodiment 3

[0046] a. Coal gangue contains 47.6g / t scandium, 5.2% iron, 25.8% aluminum, and 5.9% titanium. The gangue is crushed to -3mm, and ground with a wet ball mill until the particle size is less than 200 mesh, accounting for more than 98%;

[0047] b. Inject the pulverized coal gangue into the activation reactor, add concentrated sulfuric acid with a weight of 150% of the gangue, control the temperature at 150°C, and stir evenly for 2 hours;

[0048] c. Send the activated coal gangue to the stirring and leaching operation tank for water immersion at a liquid-solid ratio of 4:1, the operating temperature is 90°C, and the reaction time is 2h;

[0049] d. The liquid-solid separation of the ore pulp after leaching is completed, and the liquid phase is obtained as a solution containing scandium, iron, aluminum and titanium, and the solid is leaching slag containing silicon, and the leaching rate of scandium is 86.8%.

[0050] e. Heat up the solution containing scandium, titanium, iron, ...

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Abstract

The invention relates to a method for extracting scandium by activated leaching of concentrated sulfuric acid from coal gangue. Add coal gangue and concentrated sulfuric acid that are crushed and finely ground to a particle size of less than 200 mesh and account for more than 98% into the activation reactor, and the activation reaction is complete after full stirring. More than 89%, the leached pulp is filtered to obtain a scandium-containing solution, purified to remove impurities, extracted, back-extracted, and washed to obtain a primary enrichment of scandium, and the enrichment is then acid-dissolved to obtain a scandium precipitate. Then place the scandium precipitate in a high-temperature furnace for calcination to obtain scandium oxide with a purity of ≥97%. The process has the advantages of short process, simple equipment, mild reaction conditions, high scandium leaching rate, low energy consumption, and environmental friendliness. The aluminum, titanium and iron in the leaching solution of coal gangue can be purified and removed, and can be used to produce aluminum ammonium sulfate, titanium oxide, ferrous aluminum ammonium sulfate and other products.

Description

technical field [0001] The invention relates to the technical field of rare metal metallurgy, in particular to a method for activating concentrated sulfuric acid activation pretreatment and leaching scandium and scandium from coal gangue. Background technique [0002] The global scandium reserves are about 2 million tons, and China accounts for about 27.5%, ranking first in the world. There are more than 8,000 kinds of scandium-containing minerals known. The mineral composition is complex, the scandium content is low, and it is distributed in other minerals in the form of isomorphism or adsorption state. The process of enrichment, separation and extraction of high-purity scandium is quite complicated. . Scandium and its compounds have many excellent properties and are widely used in national defense, electric light source, aerospace, chemical industry, metallurgy and other fields. With the consumption of scandium increasing year by year, it is of great significance to seek...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B59/00C22B3/08
Inventor 谭林平兰立华吴建存
Owner 云南方圆矿产资源再生综合利用研究院有限公司
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