Method for recycling arsenium and enriching heavy metals in arsenium-containing metallurgical sludge

A technology for recovering heavy metals and arsenic, which is applied in chemical instruments and methods, sludge treatment, water/sludge/sewage treatment, etc., can solve the rare problems that are just starting, complex operation procedures, high investment costs, etc., to achieve Significant environmental and ecological benefits, high arsenic removal efficiency, and beautifying the environment

A technology for recovering heavy metals and arsenic, which is applied in chemical instruments and methods, sludge treatment, water/sludge/sewage treatment, etc., can solve the rare problems that are just starting, complex operation procedures, high investment costs, etc., to achieve Significant environmental and ecological benefits, high arsenic removal efficiency, and beautifying the environment

CN102061389BActive Publication Date: 2012-07-04湖北威辰环境科技有限公司
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1) Mechanical dehydration: The arsenic-containing nonferrous metallurgical sludge is dried and dehydrated, dried and ground for use. The arsenic content in the sludge is 4.9%, the zinc content is 1.3%, the copper content is 3.7%, and the cadmium content is 0.4%, lead content is 0.6%;

[0021] 2) Recovery of arsenic by calcination: Weigh 50 g of arsenic-containing non-ferrous metallurgical sludge after mechanical dehydration, and calcinate it at 750°C for 3 h to sublimate the arsenic with the flue gas to remove arsenic in the arsenic-containing metallurgical sludge, and adopt a spray quenching process Recover arsenic-containing high-temperature gas generated during calcination, recover arsenic, and obtain roasted slag after arsenic removal;

[0022] 3) Two-step acid leaching and roasting slag enrichment of heavy metals: accurately weigh 0.5 g of calcined sludge into a 100 mL round bottom flask, and add 2 mol L -1 HNO 3 10 mL, at a stirring speed of 10 r / s, leaching re...

Embodiment 2

[0027] 1) Mechanical dehydration: The arsenic-containing non-ferrous metallurgical sludge is dried and dehydrated, dried and ground for use. The arsenic content in the sludge is 8.3%, the zinc content is 4.3%, the copper content is 2.5%, and the cadmium content is 0.6%, lead content is 0.2%;

[0028] 2) Recovery of arsenic by calcination: Weigh 50 g of arsenic-containing non-ferrous metallurgical sludge after mechanical dehydration, and calcinate it at 750°C for 3 h to sublimate the arsenic with the flue gas to remove arsenic in the arsenic-containing metallurgical sludge, and adopt a spray quenching process Recover arsenic-containing high-temperature gas generated during calcination, recover arsenic, and obtain roasted slag after arsenic removal;

[0029]3) Two-step acid leaching and roasting slag enrichment of heavy metals: Accurately weigh 0.5 g of calcined sludge into a 100 mL round bottom flask, and add 1 mol L -1 HNO 3 10 mL, at a stirring speed of 10 r / s, leaching re...

Embodiment 3

[0034] 1) Mechanical dehydration: The arsenic-containing nonferrous metallurgical sludge is dried and dehydrated, dried and ground for use. The arsenic content in the sludge is 12.9%, the zinc content is 2.7%, the copper content is 1.9%, and the cadmium content is 0.8%, lead content is 0.7%;

[0035] 2) Recovery of arsenic by calcination: Weigh 50 g of arsenic-containing non-ferrous metallurgical sludge after mechanical dehydration, and calcinate it at 750°C for 3 h to sublimate the arsenic with the flue gas to remove arsenic in the arsenic-containing metallurgical sludge, and adopt a spray quenching process Recover arsenic-containing high-temperature gas generated during calcination, recover arsenic, and obtain roasted slag after arsenic removal;

[0036] 3) Two-step acid leaching and roasting slag enrichment of heavy metals: Accurately weigh 0.5 g of calcined sludge into a 100 mL round bottom flask, and add 1 mol L -1 HNO 3 10 mL, at a stirring speed of 10 r / s, leaching r...

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Abstract

The invention relates to a method for recycling arsenium and enriching heavy metals in arsenium-containing metallurgical sludge by roasting and leaching, which comprises the following steps: (1) mechanical dehydration: drying and dehydrating arsenium-containing metallurgical sludge, and milling after baking or airing for later use; (2) arsenium recycling by calcining: calcining the arsenium-containing metallurgical sludge, which is subjected to mechanical dehydration, at 500-800 DEG C for 2-4 hours, so that arsenium is sublimated along with fume so as to remove arsenium in the arsenium-containing metallurgical sludge, thereby obtaining roasting slag after arsenium removal; (3) heavy metal enriching: while stirring, carrying out acid leaching on the roasting slag after arsenium removal, which is obtained in the step (2), by a two-step process; and (4) safe landfilling of leached slag. The invention can leach out lead and other heavy metals (zinc, copper and cadmium) by multiple steps, lower the difficulty in subsequent separation, and lower the processing cost; the removal rates of arsenium, zinc, copper, cadmium and lead in the sludge with high contents of heavy metals are respectively greater than 90%; and the processed sludge can be landfilled safely.

Description

technical field [0001] The invention belongs to the field of environmental protection of solid waste treatment, and in particular relates to a method of treating arsenic-containing metallurgical sludge to recover arsenic and enrich heavy metals by means of roasting and leaching. Background technique [0002] At present, my country's industrial production is in a period of rapid development, and the demand for non-ferrous metals has greatly increased, which has greatly stimulated the rapid development of the non-ferrous metallurgical industry. The resulting metallurgical heavy metal wastes are also increasing at an alarming rate. If these wastes cannot be Effective disposal not only pollutes the environment but also requires large-scale storage yards. Sometimes, geological disasters and field destruction events are caused by the collapse of the sludge reservoir, causing huge losses to people's property and life safety. Therefore, how to effectively dispose of these heavy metal...

Claims

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Application Information

Patent Timeline
04 Jul 2012
Publication
CN102061389B
IPC
C22B7/00; C22B1/02; C22B3/06; C22B3/46; C02F11/00; C22B13/00; C22B15/00; C22B17/00; C22B19/00
CPC
Y02P10/20
Inventors
池汝安; 张越非