Method for synchronously extracting tungsten, aluminum, sodium and iron from tungsten slag and red mud

A technology of simultaneous extraction and red mud is applied in the field of metallurgical waste slag treatment and waste resource reuse.

Active Publication Date: 2018-08-10
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both of them contain a large amount of alkaline soluble matter, which are harmful solid wastes and have huge stocks. They are currently stored in the open air and occupy a large amount of land
And tungsten slag often contains more than 1% WO 3 , Red mud often contains iron with a content higher than 15%, aluminum with a content higher than 5%, and sodium with a content higher than 5%. The content of valuable elements is higher than the geological grade, but lower than t

Method used

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  • Method for synchronously extracting tungsten, aluminum, sodium and iron from tungsten slag and red mud
  • Method for synchronously extracting tungsten, aluminum, sodium and iron from tungsten slag and red mud
  • Method for synchronously extracting tungsten, aluminum, sodium and iron from tungsten slag and red mud

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Take a WO 3 Grind the tungsten slag with 1.1% content of soda pressure cooking to less than 45μm, and take another Al 2 o 3 The content is 8.5%, Na 2 The red mud with O content of 11% and Fe content of 18% is ground to less than 45 μm, and the two ground materials are fully mixed according to the ratio of tungsten slag: red mud = 1:2, and 50 mL of CO gas is introduced / min Roast at 1200°C for 200 minutes, grind the roasted material to less than 45μm and put it into 0.5mol / L sodium hydroxide solution for leaching. According to the liquid-solid ratio of 5:1, the leaching temperature is 90°C, the leaching stirring time is 20 minutes, and filter , the filter residue is magnetically separated by a high-gradient magnetic separator with a magnetic field strength of 1T to obtain iron concentrate containing Fe55%, and the filtrate is passed into CO 2 Adjust the pH of the gas to 7 and filter to obtain aluminum hydroxide solids with a purity of 98.2%. Continue to slowly add cal...

Embodiment 2

[0035] Take the fumed slag after fuming and roasting of cassiterite in a certain place, which contains WO 3 4.4%, another place Al 2 o 3 The content is 5.3%, Na 2 O content is 18.5%, and Fe content is 22.3% fly ash red mud slag after aluminum extraction, after it is ground to be less than 45 μ m, the material is fully mixed according to the ratio of tungsten slag:red mud=1:3, add total The charcoal powder with 1 / 10 of the slag content is roasted at 1000°C for 60 minutes. The roasted material is ground to less than 45 μm and then placed in an aqueous solution for leaching. According to the liquid-solid ratio of 10:1, the leaching temperature is 85°C, and the leaching and stirring time is 30 minutes. Filter. The filter residue is magnetically separated by a high-gradient magnetic separator with a magnetic field strength of 2T to obtain an iron concentrate containing Fe65.6%, and the filtrate is passed into CO 2Adjust the pH of the gas to 7.5 and filter to obtain aluminum hydr...

Embodiment 3

[0037] Take the leaching residue after acid leaching tungsten in a certain place, which contains WO 3 2.6%, another place Al 2 o 3 The content is 20.1%, Na 2 O content is 36.6%, and Fe content is the sodium silicon slag of 15.1%, after it is ground to less than 45 μ m, the material is fully mixed according to the ratio of tungsten slag: sodium silicon slag=1:0.5, feeds water gas 100mL / min in Roast at 850°C for 60 minutes, grind the roasted material to less than 45 μm and put it into 0.1mol / L sodium carbonate solution for leaching. According to the liquid-solid ratio of 3:1, the leaching temperature is 90°C, and the leaching stirring time is 30 minutes. Filter and pass the filter residue through The high gradient magnetic separator with a magnetic field strength of 2.5T obtained iron concentrate containing 62.1% Fe by magnetic separation, and CO was passed into the filtrate 2 Adjust the pH of the gas to 6.5 and filter to obtain aluminum hydroxide solids with a purity of 99.6...

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Abstract

The invention discloses a method for synchronously extracting tungsten, aluminum, sodium and iron from tungsten slag and red mud. The method comprises the steps that the tungsten slag and the red mudare ground, crushed and mixed and then are subjected to reducing roasting to obtain a sintered material; the sintered material is subjected to leaching through an alkaline solution and then subjectedto solid-liquid separation; leached residues are subjected to magnetic separating to obtain iron ore concentrate; the pH of a leaching solution is adjusted so as to deposit aluminum, and then the leaching solution is subjected to solid-liquid separation to obtain a liquid phase I and aluminum hydroxide precipitations; tungsten is deposited from the liquid phase I through calcium salt, and a liquidphase II and calcium tungstate precipitations are obtained through solid-liquid separation; the liquid phase II is subjected to causticizing through slaked lime to obtain a sodium hydroxide solutionand calcium-containing precipitations. The method has the advantages that operation is easy, energy consumption is low, chemical consumption is low, valuable metal elements in the tungsten slag and the red mud can be extracted synchronously, and industrial production is facilitated.

Description

technical field [0001] The invention relates to a treatment method of metallurgical waste residue, in particular to a method for synchronous extraction and recovery of valuable metals in tungsten slag and red mud, such as the recovery of tungsten, aluminum, sodium and iron; it belongs to waste resource recycling technology. Background technique [0002] Tungsten slag is the slag after alkali leaching, sodium roasting, water leaching or acid leaching of tungsten concentrate; red mud is the slag after alkali leaching, alkaline roasting leaching or acid leaching in alumina production, including alumina production process Sodium silicate slag and calcium silicate slag. Both contain a large amount of alkaline soluble matter, are harmful solid wastes, and have a huge stock. They are currently stored in the open air and occupy a large amount of land. And tungsten slag often contains more than 1% WO 3 , Red mud often contains iron with a content higher than 15%, aluminum with a co...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B1/02C22B34/36C22B21/00C22B26/10B03C1/02B03C1/015
CPCB03C1/015B03C1/02C22B1/02C22B7/008C22B7/04C22B21/0023C22B26/10C22B34/36Y02P10/20
Inventor 孙伟胡岳华刘航韩海生王丽高建德吕斐孙宁
Owner CENT SOUTH UNIV
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