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Method for inhibiting arsenic hydride gas during sulfuric acid leaching of high-arsenic-lead-zinc smoke dust

A high-arsenic lead-zinc and arsenic hydrogen technology, applied in the field of non-ferrous metal metallurgy, can solve problems such as long process flow

Active Publication Date: 2020-07-03
YUNNAN HONGCHI RESOURCE INTEGRATION UTILIZATION CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the process is long, and there is a risk of a large amount of arsine gas being generated and released during leaching

Method used

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  • Method for inhibiting arsenic hydride gas during sulfuric acid leaching of high-arsenic-lead-zinc smoke dust

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Control reduction furnace flue gas O 2 7.6%, NOx98mg / Nm from dust collection and desulfurization tail gas 3 (Emission standard≤200mg / Nm 3 ), the chemical analysis results of the output smoke and dust (%, wt): As4.12, Pb35.32, Zn36.61, S3.31; X-ray diffraction analysis results (%, wt): As 2 O 3 , ZnAsO 4 , ZnO, ZnS and metal elements exist in the form, arsenic metal element is 0.22, zinc metal element is 0.36; lead exists in the form of PbO, PbS and elemental Pb, of which elemental Pb is 7.62.

[0029] After slurrying the dust with clean water, 172.06g / L dilute sulfuric acid was continuously added to extract zinc. Before the pH value of the slurry reached 3.5, the measured AsH in the leaching tank was 3 The gas content is 1.42-7.46ppm, which is higher than the discoloration concentration of the mercury bromide test paper (the discoloration concentration of the mercury bromide test paper is ≥ 0.25ppm); when the pH of the leaching pulp reaches 3.5, the flow rate of dil...

Embodiment 2

[0032] Control reduction furnace flue gas O 2 8.2%, NOx 115mg / Nm in the exhaust gas from dust collection and desulfurization 3 (Emission standard≤200mg / Nm 3 ), the chemical analysis results of the output smoke and dust (%, wt): As3.95, Pb36.42, Zn34.16, S2.13; X-ray diffraction analysis results (%, wt): As 2 O 3 , ZnAsO 4 , ZnO and ZnS exist in the form of elemental arsenic 0.04, elemental zinc 0.05; lead exists in the form of PbO, PbS and elemental Pb, of which elemental Pb is 4.62.

[0033] After slurring the dust with clean water, continuously adding dilute sulfuric acid with a content of 142.31g / L to leaching zinc, before the pH value of the pulp reaches 3.5, the measured AsH in the leaching tank 3The gas content is 0.05-0.08ppm, which is lower than the discoloration concentration of the mercury bromide test paper (the discoloration concentration of the mercury bromide test paper is greater than or equal to 0.25ppm); when the pH of the leaching pulp reaches 3.5, adjust...

Embodiment 3

[0036] Control reduction furnace flue gas O 2 9.8%, NOx 150mg / Nm from dust collection and desulfurization tail gas 3 (Emission standard≤200mg / Nm 3 ), the chemical analysis results of the output smoke and dust (%, wt): As6.76, Pb40.63, Zn33.17, S1.82; X-ray diffraction analysis results (%, wt): As 2 O 3 , ZnAsO 4 , ZnO and ZnS exist, and no elemental arsenic and zinc are detected; lead exists in the form of PbO, PbS and elemental Pb, of which elemental Pb is 2.81.

[0037] After slurrying the smoke and dust with clean water, continuously adding dilute sulfuric acid with a content of 160.25g / L to leaching zinc, before the pH value of the pulp reaches 3.5, the measured AsH in the leaching tank 3 The gas content is 0.07-0.11ppm, which is lower than the discoloration concentration of the mercury bromide test paper (the discoloration concentration of the mercury bromide test paper is greater than or equal to 0.25ppm); when the pH of the leaching pulp reaches 3.5, the flow rate o...

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Abstract

The invention relates to a method for inhibiting arsenic hydride gas during sulfuric acid leaching of high-arsenic-lead-zinc smoke dust produced by a lead reduction furnace, and belongs to the technical field of nonferrous metallurgy. The method comprises the following steps that a secondary tuyere is formed in an ascending section of the reduction furnace, air is continuously blown in, and the oxygen content in flue gas is controlled, so that volatile arsenic, lead, zinc steam and other metal steam are oxidized, and the single mass of metal in the smoke dust is controlled; and the high-arsenic-lead-zinc smoke dust is pulped through using clear water, leaching is carried out through using only one section of weak acid, the concentration of added dilute acid, the leaching process and an endpoint pH value are controlled, and after solid-liquid separation is carried out on a leached ore pulp, zinc is recovered from a filtrate, and filter residues are returned to an intensified smelting furnace to recover lead. By means of the method, the arsenic, the zinc and the like in the high-arsenic-lead-zinc smoke dust can be oxidized completely, the NOx content of dust-collected and desulfurized tail gas meets emission standard, the high-concentration arsenic hydride gas, formed by a small amount of metal elementary substances wrapped by metal oxides in the smoke dust and the leached arsenic, can be prevented from escaping, the content of Zn in the filter residues is smaller than or equal to 8.00%, and the zinc and the lead are well separated.

Description

technical field [0001] The invention belongs to the field of non-ferrous metal metallurgy, and in particular relates to a method for suppressing arsine gas during sulfuric acid leaching of high-arsenic lead-zinc soot. Background technique [0002] After the lead concentrate and lead secondary materials (such as zinc oxide fume sulfuric acid leaching slag) are desulfurized in an intensified smelting furnace (top-blown furnace, bottom-blown furnace and side-blown furnace, etc.), when the liquid slag is smelted by a reduction furnace such as a side-blown furnace , the reduction furnace will produce high-arsenic lead-zinc soot, which contains As4-10%wt, and Pb+Zn70-75%wt. At present, the industrial application mainly returns the ingredients of the enhanced smelting furnace. The main problem of this method is that the zinc content of the slag of the enhanced smelting furnace and the reduction furnace increases due to the cyclic enrichment of zinc, which makes the slag performance...

Claims

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Application Information

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IPC IPC(8): C22B7/02C22B1/11C22B13/00C22B19/20C22B19/30
CPCC22B1/11C22B7/007C22B7/02C22B13/045C22B19/22C22B19/30Y02P10/20
Inventor 戴兴征张梅晋家强罗恒刘贤张殿彬陆占清董铁广邹利明邓海波强振华谢富华闫建英
Owner YUNNAN HONGCHI RESOURCE INTEGRATION UTILIZATION CO LTD
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