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Method for recycling valuable metal in zinc smelting sludge

A valuable metal and zinc smelting technology, applied in the direction of improving process efficiency, can solve problems such as environmental pollution and waste of resources, and achieve the effects of less investment in equipment, high production efficiency, and low energy consumption

Inactive Publication Date: 2016-07-20
YUNNAN BOXI ENVIRONMENTAL PROTECTION EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] With the increase of lead-zinc smelting output in our country year by year, a large amount of lead-zinc smelting sludge is produced. If it is not handled properly, it will not only waste resources, but also pollute the environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The moisture content of the zinc smelting sludge is 63.56%, and the zinc content is 8.94%.

[0028] Put the zinc smelting sludge into a self-made ultrasonic oscillation system, keep the ultrasonic frequency at 80kHz, and the ultrasonic treatment time is 30min to obtain sludge clinker. The sludge clinker and 30g / L sulfuric acid solution were put into the Hastelloy pressure leaching tank at the same time according to the weight-liquid-solid ratio of 1:10, and the reaction temperature was kept at 160°C, the pressure was 1.5MPa, and the temperature was kept for 3h. Then, the zinc sludge after pickling is introduced into the plate and frame filter press and washed with water for 4 times, and at the same time, filter aid is added in an amount of 50g / ton, and filter press is carried out to realize liquid-solid separation. The separated waste acid directly enters the purification system of zinc smelting. The separated solid phase enters a microwave drying oven, the control fre...

Embodiment 2

[0031] The moisture content of the zinc smelting sludge is 57.58%, and the zinc content is 9.45%.

[0032] Put the zinc smelting sludge into the self-made ultrasonic oscillation system, keep the ultrasonic frequency at 50kHz, and the ultrasonic treatment time is 20min to obtain the sludge clinker. The sludge clinker and 10g / L hydrochloric acid solution were put into the Hastelloy pressure leaching tank at the same time according to the weight-liquid-solid ratio of 1:5, and the reaction temperature was kept at 130°C, the pressure was 2.0MPa, and the temperature was kept for 2h. Then, the pickled zinc sludge is introduced into the belt filter and washed with water for 5 times, and at the same time, filter aid is added in an amount of 80g / ton, and filtered to realize liquid-solid separation. The separated waste acid is treated by the ion exchange system and directly enters the purification system of zinc smelting. The separated solid phase enters a microwave drying oven, the con...

Embodiment 3

[0035] The moisture content of zinc smelting sludge is 48.76%, and the zinc content is 7.34%.

[0036] Put the zinc smelting sludge into a self-made ultrasonic oscillation system, keep the ultrasonic frequency at 70kHz, and the ultrasonic treatment time is 30min to obtain sludge clinker. The mixture of sludge clinker, 5g / L hydrochloric acid solution and 20g / L sulfuric acid solution (1:1) is put into the Hastelloy pressure leaching tank at the same time according to the weight-liquid-solid ratio of 1:8, and the reaction temperature is kept at 180°C. The pressure is 1.0MPa, and the temperature is kept for 2.5h. Then the zinc sludge after pickling was introduced into the ceramic filter and washed with clean water for 3 times. At the same time, filter aid was added in an amount of 860g / ton, and filter press was carried out to realize liquid-solid separation. The separated waste acid is treated by the ion exchange system and directly enters the purification system of zinc smelting...

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Abstract

The invention discloses a method for recycling valuable metal in zinc smelting sludge. The method comprises the steps that sludge of a zinc smelting system and tap water are mixed and then put into an ultrasonic device to be subjected to ultrasonic vibration, and sludge clinker is obtained; the sludge clinker and a dilute acid solution are mixed and then put into a pressurization reaction kettle, the reaction temperature and the reaction time are controlled, valuable metal ions are dissolved out, and clean sludge is obtained; the clean sludge is put into a plate filter pressing device, a filter aid is added, the clean sludge is filtered and dried after cleaning, and sludge powder with the water content lower than 5% is obtained; and reaction liquid obtained after filtering returns to the zinc smelting system to be purified and electrolyzed, and zinc metal is obtained through recycling. The sludge powder obtained through the method can be used for producing cement products or glass ceramics which are high in performance, contained heavy metal ions can all return to a zinc electrolysis system, and harmless, minimal and resourceful utilization of dangerous waste zinc smelting sludge can be thoroughly achieved. The method is simple, feasible, high in environmental protection benefit and production efficiency, less in equipment investment and low in energy consumption.

Description

technical field [0001] The invention belongs to the technical field of recycling and harmless treatment of metallurgical technology waste, and in particular relates to a method for recovering valuable metals in zinc smelting sludge. Background technique [0002] There are many types of solid waste and raw materials used in the mining, dressing and smelting process of the lead-zinc industry. In the "National Hazardous Waste List" (2008 Edition), 20 kinds of lead-zinc smelting wastes are clearly defined as hazardous wastes. The wastewater treatment sludge is hazardous waste (waste code: 331-022-48). In the process of producing acid from the flue gas of lead and zinc smelting, the flue gas is purified by the pickling and spraying process. This process produces a large amount of dirty acid, which usually contains sulfuric acid, sulfurous acid, lead, zinc, mercury, arsenic, fluorine, etc. At present, most enterprises adopt methods such as lime method and lime-iron salt method t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B19/30
CPCC22B7/007C22B19/30Y02P10/20
Inventor 朱树文梅向阳于站良车勤福谢立灏关伟徐念杨骏
Owner YUNNAN BOXI ENVIRONMENTAL PROTECTION EQUIP CO LTD