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

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...

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 the metallurgical grade.

As a metallurgical waste residue, it no longer has the crystal properties of the original minerals, and it cannot be effectively recovered only by beneficiation.

However, the existing metallurgical methods need to consume a lot of energy and chemicals in the process of treating tungsten slag or red mud alone, and the cost is relatively high, and the gain outweighs the gain, and the recovery value of valuable metals in these waste slags is not great.

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