Full-quantification and high-value utilization method of electric furnace fly ash and iron extraction tailings thereof

Abstract

The invention discloses a full-quantification and high-value utilization method of electric furnace fly ash and iron extraction tailings thereof. The method comprises the following processing procedures: (1) pellet preparation, (2) vacuum smelting, (3) vacuum cooling, (4) magnetic separation and recovery of high-purity Zn-Pb alloy, and (5) preparation of sintered bricks from zinc extraction tailings. According to the method, the Zn-Pb alloy is prepared through carbon thermal reduction and assisted by vacuum smelting of the electric furnace dedusting ash iron extraction tailings, the sintered bricks are prepared through the tailings of the Zn-Pb alloy, the high-purity Zn-Pb alloy product and the sintered brick product with the purity larger than or equal to 96.0% are prepared, full-quantization and high-value utilization of the electric furnace dedusting ash and the iron extraction tailings of the electric furnace dedusting ash are achieved, and economic benefits and environmental benefits are remarkable. The method provided by the invention overcomes the defects of long process flow, high cost, large emission, low added value of products and the like in the prior art, and has wide market popularization and application prospects.

Description

technical field [0001] The invention relates to the field of resource utilization of solid waste in the metallurgical industry, in particular to a method for comprehensive recycling of electric furnace dust removal ash and its iron-extracting tailings. Metal smelting, electric power and other industries. Background technique [0002] Electric furnaces will produce a lot of smoke and dust during the smelting process. According to incomplete statistics, at present, the metallurgical industry in my country can collect nearly 4 million tons of electric furnace smoke and dust every year; The amount of smoke generated is even more impressive. When the electric furnace is in normal operation, the flue gas and dust collected by the dust collector not only contain elements that promote sintering, such as Fe and Ca, but also elements that are not conducive to sintering, such as K, Na, and Zn. In order to meet the requirements of environmental protection, there are usually two ways fo...

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the existence of separation and extraction of metal zinc and lead in the existing electric furnace dust removal technology for zinc extraction, long process flow, many unorganized emissions, high smelting temperature, high energy consumption, high smelting cost, and low product added value and other problems, and provide a full quantification and high value utilization method of electric furnace dedusting ash and its iron-extracting tailings, which adopts carbothermal reduction, supplemented by vacuum smelting, and conducts the Pb and Zn resources in the electric furnace dedusting ash and its iron-extracting tailings Cascade separation and recovery, and resource utilization of tailings, the specific implementation of the following steps:

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