Method for treating waste copper slag

A treatment method, copper slag technology, applied in the field of comprehensive utilization of solid waste renewable resources, can solve problems such as ineffective, unrealized lead and zinc recycling, and low recycling efficiency, so as to reduce environmental pollution and realize effective recycling , the effect of reducing the negative impact

Active Publication Date: 2013-03-27
北京中冶设备研究设计总院有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, more and more domestic and foreign scholars have begun to study the recovery of valuable metals in iron smelting waste slag, but the effect is not obvious, especially for the maximum recovery of copper, iron, lead, zinc and other valuable metals in copper slag. The basic research is insufficient, and most of the methods used are limited to the recovery of one or two metals by physical beneficiation, with low recovery efficiency; or the wet leaching process is used, but the process is long and costly, and lead and zinc have not been realized. of recycling
Foreign scholars in Japan and Chile have studied that crude copper converter slag with a copper content higher than 4% is recycled by direct leaching-direct flotation-oxidation or sulfate roasting-leaching, but the copper content is less than 1% % of copper smelting slag has not been reported

Method used

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  • Method for treating waste copper slag

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] Embodiment 1: The specific implementation content is to carry out the typical waste copper slag sample of a certain copper smelter, a total of 10kg (TFe=39.4%, Cu=0.62%, Zn=2.69%, Pb=0.63%) according to the process flow of the present invention Treatment, the treatment process is as follows: (1) Finely grind waste copper slag until the particle size is less than 74μm (200 mesh) accounting for more than 90%, and use flotation to produce copper concentrate. Specific process: roughing, three-stage beneficiation, and three-stage scavenging produce final copper concentrate (15% copper) and primary tailings; (2) primary tailings are mixed with 15% lime and 10% coal, and fully mixed , in a tubular resistance furnace to simulate the process conditions of the rotary kiln, heat preservation at 1000 ° C for 1 hour, and heat preservation at 1100 ° C for 1 hour; first reduction and then oxidation roasting. Use a bag dust collector to recover the dust, and finely grind the cooled oxi...

Embodiment 2

[0009] Embodiment 2. The specific implementation content is to carry out a total of 10kg (TFe=39.4%, Cu=0.62%, Zn=2.69%, Pb=0.63%) of a typical waste copper slag sample of a copper smelter according to the process flow of the present invention Treatment, the treatment process is: (1) finely grind waste copper slag until the particle size is less than 74μm (200 mesh) accounting for more than 95%, and use flotation to produce copper concentrate. The specific process: roughing, three-stage selection, three-stage sweeping The final copper concentrate (containing 12% copper) and primary tailings are produced through separation. (2) Add 20% lime and 8% coal to the primary tailings, mix well, and simulate the process conditions of the rotary kiln in a tubular electric resistance furnace, keep warm for 40 minutes at 1050°C, and keep warm for 50 minutes at 1150°C; Oxidation and roasting after reduction; dust is recovered with a bag filter; and the cooled oxidation and roasting product ...

Embodiment 3

[0010] Embodiment 3, the specific implementation content is that a typical waste copper slag sample of a copper smelter, a total of 1500kg (TFe=39.4%, Cu=0.62%, Zn=2.69%, Pb=0.63%) is processed according to the process of the present invention , the treatment process is as follows: (1) Finely grind waste copper slag until the particle size is less than 74μm (200 mesh) accounting for more than 90%, and use flotation to produce copper concentrate. Specific process: roughing, three-stage beneficiation, and three-stage sweeping to produce final copper concentrate (13% copper) and primary tailings. (2) The primary tailings are mixed with 12% lime and 6% coal, mixed thoroughly, and kept in a rotary kiln at 1020°C for 5 minutes, and at 1080°C for 50 minutes; first reduced and then oxidized and roasted. Use a bag filter to recover the dust, and finely grind the cooled oxidized and roasted product until the particle size is less than 74 μm (200 mesh) accounting for more than 90%, and u...

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Abstract

The invention provides a method for treating waste copper slag. The method is characterized by respectively obtaining copper concentrate, ferrum concentrate and waste materials containing lead and zinc smoke and capable of being used for air-entrapping bricks according to the process route of floatation, reduction-oxidation roasting of a rotary kiln and magnetic separation in sequence; according to the process scheme, the method comprises the following steps: a. floating 90% of 200-mesh waste copper slag with fine grinding size of smaller than 74mu m to obtain the copper concentrate and primary tailings; b. conducting reduction-oxidation roasting to the primary tailings in the rotary kiln, recovering lead and zinc through smoke, conducting magnetic separation on the roasted product to obtain the ferrum concentrate and the final tailings; and c. taking the final tailings as raw materials of aerated concrete products to produce air-entrapping bricks. The method has the advantages of being clean, environment-friendly and zero-emission in waste copper slag treatment process, not only realizing the effective recovery of resources, and reducing environmental pollution, but also obtaining good economic benefits.

Description

Technical field: [0001] The invention relates to the technical field of comprehensive utilization of solid waste renewable resources, in particular to a treatment method for recovering copper, iron, lead and zinc from waste copper slag. Background technique: [0002] In the prior art, with the development of economy and society, copper production and copper consumption are constantly increasing, and at the same time, a large amount of tailings and waste copper slag are also discharged in the process of producing and smelting various copper products; The main components of its waste copper slag generally contain Cu, Fe, SiO 2 , S, and a certain amount of Pb, Zn, etc.; the existence of a large amount of waste copper slag not only occupies a lot of land, but also is not conducive to production and management; and the washing of rainwater will also cause the heavy metals in the slag to penetrate into the soil and groundwater, causing ecological pollution. and environmental poll...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B15/00C22B19/30C22B13/00C04B28/14C04B18/14
CPCY02P10/20Y02W30/91
Inventor 张金良郭明威周春芳郭华赵伟杰黄超张富信
Owner 北京中冶设备研究设计总院有限公司
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