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Method for comprehensive recovery of tantalum and niobium from red mud

A technology for red mud, tantalum and niobium, which is applied in the field of extracting valuable metals, can solve the problems of recovering precious metals such as tantalum and niobium, which have not been reported, and achieve the effect of separation and extraction.

Inactive Publication Date: 2014-07-02
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, a lot of work has been done on the recovery of valuable metals in red mud at home and abroad. The research mainly focuses on the recovery of iron, aluminum, and sodium with high content in red mud, and there are also some studies on scandium with low content in red mud. recovery of titanium and vanadium, but there is no report on the recovery of precious metal tantalum and niobium from red mud

Method used

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  • Method for comprehensive recovery of tantalum and niobium from red mud

Examples

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Effect test

Embodiment 1

[0024] 1) Mix 60kg of red mud and 30kg of coal ash for reduction roasting to make Fe 2 o 3 converted to Fe 3 o 4 ; (2) Magnetic iron concentrate and non-magnetic slag are obtained by magnetic separation; (3) The mixture of non-magnetic slag, sodium hydroxide and sodium carbonate is melted at 500-800°C, and the mixing example of sodium hydroxide and sodium carbonate 9:1; (4) Crushing the molten massive melt, heating and stirring in 10% dilute hydrochloric acid for acidolysis leaching; (5) acid leaching residue in 21mol / L high concentration HF and HNO 3 Heating and dissolving in the mixed acid, after cooling, add water and H 2 SO 4 Dilute to get 6 mol / L H 2 SO 4 and 0.5 mol / L HF-containing niobium-tantalum feed solution; (6) liquid film method is used to separate and extract niobium-tantalum from the diluted solution, wherein the diluted solution is the feed liquid phase, and 2-octanol is the organic phase, 0.5mol / L NaOH is the internal liquid phase, the ratio of water t...

Embodiment 2

[0027] 1) Combine 50kg red mud with 10m 3 Coal gas is mixed for reduction roasting, so that Fe 2 o 3 converted to Fe 3 o 4 ; (2) Magnetic iron concentrate and non-magnetic slag are obtained by magnetic separation; (3) The mixture of non-magnetic slag, sodium hydroxide and sodium carbonate is melted at 500-800°C, and the mixing example of sodium hydroxide and sodium carbonate 8.5:1.5; (4) crush the melted massive melt, heat and stir in 20% dilute sulfuric acid for acidolysis leaching; (5) acid leaching residue in 22.5mol / L high concentration HF and HNO 3 Heating and dissolving in the mixed acid, after cooling, add water and H 2 SO 4 Dilute to get 5mol / L H 2 SO 4 and 0.4mol / L HF-containing niobium-tantalum feed solution; (6) liquid film method is used to separate and extract niobium-tantalum from the diluted solution, wherein the diluted solution is the feed liquid phase, and 2-octanol is the organic phase, 0.5mol / L NaOH internal liquid phase, the ratio of water to milk...

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Abstract

The invention provides a method for comprehensive recovery of tantalum and niobium from red mud. The method comprises the following steps: mixing red mud with a reducing agent to carry out reducing roasting, and then carrying out magnetic separating to obtain magnetic iron ore concentrate and non-magnetic slag; fusing the non-magnetic slag and a mixture of sodium hydroxide and sodium carbonate at 500-800 DEG C to transform tantalum and niobium into sodium tantalum oxide and sodium niobate; crushing the molten massive melt, and heating, agitating and leaching by using a certain amount of acid, so that main ingredients of the non-magnetic slag, such as calcium, aluminum, silicon and a little of oxide of iron are dissolved, and the complicated compounds of tantalum and niobium are also decomposed to be transformed into hydroxide, but still reserved in the slag to be gathered; heating and dissolving the acid-leaching slag in a mixed acid of HF and HNO3; adding water and H2SO4 to dilute after cooling; carrying out tantalum and niobium separation and extraction on the diluted solution by adopting a liquid-film method. By adopting the method, not only can tantalum and niobium in the red mud be gathered, but also separate recovery and extraction of tantalum and niobium can be achieved.

Description

technical field [0001] The invention relates to a method for extracting valuable metals from red mud, in particular to a method for comprehensively recovering tantalum and niobium from red mud. Background technique [0002] Alumina red mud is a waste in the process of alumina production. my country is a big country of alumina production and produces tens of millions of tons of red mud every year. At present, most alumina production enterprises at home and abroad store red mud in open yards, which contains a large amount of industrial alkali, fluoride and other metals. It is very easy to cause pollution and damage to the surface, air, and groundwater, and there is a potential safety hazard of red mud leakage. While my country's aluminum industry is developing rapidly. Problems such as resource waste, environmental pollution and safety hazards caused by red mud stockpiling have become increasingly prominent. Therefore, the comprehensive treatment of red mud is imminent. T...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B34/24
CPCY02P10/20
Inventor 甘霖董红军张正林许家伟梁愈斌谭金玉郑进城
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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