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Dressing-smelting combined treatment method for sulfate-containing lead-zinc smelting slags

A combination technology of sulfate lead-zinc and dressing and smelting, which is applied in the field of dressing and smelting, can solve the problems of high recycling cost, difficult recycling, and environmental pollution by wet or pyrotechnic methods, and achieve no heavy metal pollution, stable flotation system, and high production efficiency. Chen Benlow's effect

Inactive Publication Date: 2013-05-15
CENT SOUTH UNIV
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Problems solved by technology

[0004] Aiming at a series of problems such as the environmental pollution caused by the large amount of lead-containing zinc leaching slag produced in the current hydrometallurgy, comprehensive utilization of copper soot, and the production of a large amount of lead-containing zinc leaching residue in the process of bismuth smelting, the high cost of wet or pyrotechnic recovery, and the difficulty of conventional mineral processing methods, etc., The present invention aims to provide a combined treatment method for the separation and smelting of sulfate-containing lead-zinc smelting slag reduction roasting, water quenching, ore grinding and flotation after the roasted material is slowly cooled. Under reducing atmosphere, lead sulfate and zinc are reduced to lead-zinc sulfide ore, after slow cooling, water quenching, ore grinding and flotation, and finally high-quality lead sulfide and zinc sulfide concentrates are obtained

Method used

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  • Dressing-smelting combined treatment method for sulfate-containing lead-zinc smelting slags

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Treatment object: Lead-containing slag in the conventional hydrometallurgy process.

[0050] The lead-containing slag in the conventional hydrometallurgy process is the residue after the leaching of zinc oxide soot. Its main chemical composition (mass percentage) is: Pb35%, Zn8%, Fe10%, and the chemical phase of lead (mass percentage) is: PbSO 4 30%, PbS4%, other 1%, the chemical phase (mass percentage) of zinc is: ZnSO 4 7%, ZnFe2O 4 1%.

[0051] Take 200g of the slag to carry out the reduction test of carbon monoxide. Firstly, the temperature is heated to 700°C under the protection of nitrogen, and then the flow rate is 3.0L / min with a volume fraction of 10% of carbon monoxide and 6.0L / min of carbon dioxide. The holding time is 1.5h. After the end, use nitrogen as a protective gas for slow cooling, and start water quenching when the temperature drops below 200 °C. The water-quenched material was ground to -74μm, and then subjected to flotation tests to finally obt...

Embodiment 2

[0053] Treatment object: lead-silver slag produced in hot acid leaching.

[0054] The lead-silver slag produced in hot acid leaching is the residue after hot acid leaching concentration and separation, and its main chemical components (mass percentage) are: Pb40%, Zn6%, Fe28%, SiO 2 10%, the chemical phase (mass percentage) of lead is: PbSO 4 32%, PbS6%, other 2%, the chemical phase (mass percentage) of zinc is: ZnSO 4 5%, ZnFe 2 o 4 1%.

[0055] Take 200g of the slag material for carbon powder reduction test, fully mix 5% coke powder and mineral powder, start to heat up after covering, start timing when the temperature rises to 600°C, hold time for 2.0h, follow the furnace after roasting Cool slowly, and start water quenching when the temperature drops below 200°C. The water-quenched material was ground to -74μm, and then subjected to flotation tests to finally obtain lead concentrate with a lead grade of 65% and a recovery rate of 85% and a zinc concentrate with a zinc ...

Embodiment 3

[0057] Treatment object: lead-containing slag after extraction of valuable metals from copper smelting soot.

[0058] The lead-containing slag after the extraction of valuable metals from copper smelting soot is the by-product of the comprehensive utilization of copper smelting soot to extract valuable metals such as bismuth, zinc, cadmium, and copper. Its main chemical components (mass percentage) are: Pb38%, Zn4%, Fe12%, Ag: 200g / t, lead chemical phase (mass percentage): PbSO 4 32%, PbS6%, zinc is mainly zinc sulfate.

[0059] Take 200g of the slag material for carbon powder reduction test, fully mix 7% coke powder and mineral powder, start to heat up after covering, and start timing when the temperature rises to 700°C, and the holding time is 3.0h. The furnace is cooled slowly, and water quenching is started when the temperature drops below 200°C. Water-quenched materials were ground to -74μm, and then flotation tests were carried out to obtain lead concentrates with a le...

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Abstract

The invention discloses a dressing-smelting combined treatment method for sulfate-containing lead-zinc smelting slags, and belongs to the field of dressing and smelting. For solving the environmental problems caused by the difficult mineral dressing and recycling of lead sulfate and zinc sulfate containing materials and the stockpiling, percolation and leaching and the like of slag charges, the dressing-smelting combined treatment method for sulfate-containing lead-zinc smelting slags comprises the following steps: 1) drying: carrying out heating and drying treatment on slag charges; 2) roasting: adding a reducing agent into the dried slag charges so as to carry out reduction roasting; 3) after the roasting is completed, slowly cooling the slag charges, and after the temperature of the slag changes is reduced to below 200 DEG C, carrying out water quenching on the slag charges so as to obtain water-quenched slags; and 4) grinding and floatation: after the water-quenched slags are subjected to ore grinding and grading, taking a material with the particle size of less than 75 mu m and carrying out flotation separation on the material so as to obtain a lead concentrate and a zinc concentrate. According to the invention, the lead content of the obtained lead concentrate is more than 55%, and the recovery rate is more than 80%, the zinc content of the zinc concentrate is more than 35%, and the recovery rate is more than 75%; and the method disclosed by the invention has the characteristics of low treatment cost, no heavy metal pollution, and high lead and zinc metal recovery rates.

Description

technical field [0001] The invention relates to the field of dressing and smelting, in particular to a combined dressing and smelting treatment method of reduction roasting of sulfate-containing lead-zinc smelting slag, water quenching, ore grinding and flotation after the roasted material is slowly cooled. Background technique [0002] A large amount of leaching slag containing lead and zinc is produced in the process of zinc hydrometallurgy, comprehensive utilization of copper soot and bismuth smelting, and the lead and zinc in these slags mainly exist in the form of sulfate. Due to the sluggish lead-zinc market and relatively high disposal costs, most of these slags are disposed of in stockpiles or sold at a low price. Since then, slag has piled up into mountains, lead and zinc resources have not been effectively utilized, and environmental problems have become more and more prominent, restricting the development of the lead and zinc industry. [0003] The current treatm...

Claims

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Application Information

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IPC IPC(8): C22B1/02C22B7/04C22B13/00C22B19/30B03D1/00
CPCY02P10/20
Inventor 刘维覃文庆蔡练兵刘三军郑永兴孔燕罗虹霖
Owner CENT SOUTH UNIV
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