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Combined As removing and purifying method

A technology for removing arsenic and arsenic dust, applied in the direction of improving process efficiency, etc., can solve the problem of high production cost, and achieve the effects of high efficiency, feasibility and system, high comprehensive arsenic removal rate and metal separation rate

Active Publication Date: 2016-04-20
LEIYANG YANXIN NON FERROUS METALS
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  • Claims
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Problems solved by technology

As far as the pyrotechnic process is concerned, from the perspective of metal separation rate, the sublimation dearsenic method is the highest among the existing methods, but this method is only suitable for the case where the arsenic grade of the raw material is higher than 25%, otherwise the production cost will be too high
The method of sublimation and puri

Method used

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  • Combined As removing and purifying method

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Effect test

Embodiment 1

[0017] Embodiment 1: bulk material horse boiler method

[0018] ① Match the materials for sintering production, so that it contains Pb+Sn+Bi30%, Fe10.5%, SiO? 10%, CaO6.5%, As?O? 10%, and the weight is 100T dry material. After being mixed by a forklift and crushed by a hammer crusher, it is put into a disc granulator with a diameter of 3.2m, and the granulation diameter is 3mm~6mm. Enter a 1.5m wide × 25m long chain row sintering dearsenic furnace. After sintering to remove arsenic, 60.5T of sintered lumps were produced, 23.2T of returned powder, 16.2T of primary oxidative enrichment dust, 0.1T of unknown loss, and the composition of sintered block and returned powder was the same. The produced agglomerates are fed into the blast furnace for reduction smelting as described later, and the returned powder is directly used as ingredients in the sintering furnace for further sintering.

[0019] The assay composition of output sintered lump and returned powder:

[0020] Pb+Sb+Bi...

Embodiment 2

[0043] Example 2: Pelletizing shaft furnace method

[0044] ① Prepare the sintering production materials, so that it contains Pb+Sn+Bi30%, Fe10.5%, SiO? 10%, CaO6.5%, As?O? 10%, and the weight is 100T dry material. After being piled up and mixed by a forklift, it is crushed by a hammer crusher and then sent to a disc granulator with a diameter of 3.2m, and the granulation diameter is 3mm~6mm. into the 1.5m wide × 25m long chain row type sintering and dearsenic furnace. After sintering and removing arsenic, 60.5T of sintered agglomerate was produced, 23.2T of powder returned, 16.2T of smoke and dust enriched by primary oxidation, and 0.1T of unnamed loss. The produced agglomerates are sent to the blast furnace for reduction and smelting as described later, and the returned powder is directly fed into the sintering furnace for re-sintering.

[0045] The assay composition of the output agglomerates and regrinds:

[0046] Pb+Sb+Bi30.92%; As?O?4.2%; Fe12.5%; SiO?11.9%; CaO7.70% ...

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Abstract

The invention discloses a combined As removing and purifying method. The method comprises the steps of mixing As containing smoke of different grades to the degree that an As2O3 is smaller than 10%, and a valuable metal grade is larger than 15%; preparing into a proper slag form; sintering to remove As of one of half raw material to form sintered blocks, producing first oxidability enriching smoke with 25-30% of As2O3, then briquetting the other half of raw material and inputting into a blast furnace with the sintered blocks, and producing the first reducibility enriching smoke with 18-40% of As2O3; then performing equal proportion burdening and sublimation and As removing on the first oxidability enriching smoke and the first reducibility enriching smoke to produce secondary enriching smoke with the As2O3 as high as 70-80%, after As removing, returning residues to a first enriching system for reuse, thus realizing a high As removing rate and metal separation rate of the large-scale As containing raw material smelting; finally sublimating the secondary enriching smoke according temperature sections to purify As2O3.

Description

technical field [0001] The invention relates to the smelting and comprehensive recovery of arsenic-containing smoke and dust in nonferrous metals, in particular to a method for combining high-arsenic smoke and dust to remove arsenic and purify arsenic. Background technique [0002] In the non-ferrous metal smelting industry, the sources and channels of arsenic-containing fumes are different, and the grades of arsenic are also different. For example, the content of As?O? It can reach 30%~70%, and the content of its valuable metals also ranges from 5%~50%. For a large-scale comprehensive recovery of arsenic-containing fumes with a scale of tens of thousands of tons per year, the average arsenic content of its raw materials is generally between 2% and 25%. As far as the pyrotechnic process is concerned, from the perspective of metal separation rate, the sublimation dearsenic method is the highest among the existing methods, but this method is only suitable for the situation wh...

Claims

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Application Information

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IPC IPC(8): C22B7/02C22B30/04
CPCC22B7/001C22B7/02C22B30/04Y02P10/20
Inventor 石俊阳石仁章梁金凤石宏娇王小明汪琴梁伟梁斌
Owner LEIYANG YANXIN NON FERROUS METALS
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