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System and method for treating copper slag by annular roasting furnace

A roasting furnace and ring-shaped technology, applied in the field of smelting, can solve the problems of resource waste, unusable, high cost, etc., and achieve the effect of comprehensive recycling, reducing impact and reducing disturbance

Inactive Publication Date: 2017-02-15
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The iron in the copper slag is mainly distributed in the two phases of olivine and magnetic iron oxide. There are few optional magnetic iron oxide minerals, and the two are embedded in each other, and the particle size is small, which makes it difficult to carry out the magnetic separation process. The yield of iron concentrate is low, the silicon content is seriously high, the cost is high, the quality is poor, and it cannot be used. As a result, the copper utilization rate of the current copper smelting slag is less than 12%, and the iron utilization rate is less than 1%.
Due to the particularity of the useful mineral structure of copper slag, pyrometallurgy and hydrometallurgy are more difficult, and iron cannot be recovered efficiently.
[0005] So far, there is no mature process for effectively treating copper smelting slag, resulting in a large amount of copper slag rich in iron, copper and other heavy metals having to be stockpiled, which not only causes a great waste of resources, but also occupies land, pollutes the environment, and hinders copper smelting Sustainable Development of Enterprises

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  • System and method for treating copper slag by annular roasting furnace
  • System and method for treating copper slag by annular roasting furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] A copper slag composition, TFe: 38.64wt%, Cu: 1.15wt%, Zn: 0.6wt%; reduced coal composition, fixed carbon 74.22%, volatile matter 8.44%; choose bentonite as binder, according to copper slag: reduced coal : Bentonite = 100:19:2 ratio for batching. The prepared material is subjected to moistening and grinding treatment, and the mass of the material whose particle size is less than 325 mesh after grinding accounts for 86.60%, and is pelletized after adding water. The prepared pellets are dried and put into the ring roasting furnace. The temperature of the low-temperature reduction zone is 950°C, the temperature of the grain growth zone is 1300°C, the temperature of the cooling zone is 900°C, and the rotation time is 90min. The dust-laden flue gas is subjected to bag dust removal treatment, and ZnO dust with a Zn grade of 60.4wt% can be collected. After the reduced pellets are ground, the iron and slag are separated by 1200Oe weak magnetic separation to obtain metal iron p...

Embodiment 2

[0055] A copper slag composition, TFe: 38.64wt%, Cu: 1.15wt%, Zn: 0.6wt%; reduced coal composition, fixed carbon 56.71%, volatile matter 15.44%; choose bentonite as binder, according to copper slag: reduced coal : Bentonite=100:22:8 ratio for batching. The prepared material is subjected to moistening and grinding treatment, and the quality of the material whose particle size is less than 325 mesh after grinding accounts for 88.32%, and is pelletized after adding water. The finished pellets are dried and put into the annular roaster. The temperature of the low-temperature reduction zone is 1100°C, the temperature of the grain growth zone is 1400°C, the temperature of the cooling zone is 1050°C, and the rotation time is 90min. The dust-laden flue gas is subjected to bag dust removal treatment, and ZnO dust with a Zn grade of 62.5wt% can be collected. After the reduced pellets are ground, the iron and slag are separated by 1000Oe weak magnetic separation to obtain metal iron pow...

Embodiment 3

[0057] A copper slag composition, TFe: 43.75wt%, Cu: 0.45wt%, Zn: 1.23wt%; reduced coal composition, fixed carbon 74.22%, volatile matter 8.44%; choose bentonite as binder, according to copper slag: reduced coal : Bentonite=100:26:5 ratio for batching. The prepared material is subjected to moistening and grinding treatment, and the mass of the material whose particle size is less than 325 mesh after grinding accounts for 86.60%, and is pelletized after adding water. The prepared pellets are dried and put into the ring roasting furnace. The temperature of the low-temperature reduction zone is 800°C, the temperature of the grain growth zone is 1450°C, the temperature of the cooling zone is 1100°C, and the rotation time is 90min. The dust-laden flue gas is subjected to bag dust removal treatment, and ZnO dust with a Zn grade of 61.7wt% can be collected. After the reduced pellets are ground, the iron and slag are separated by 1800Oe weak magnetic separation to obtain metal iron p...

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Abstract

The invention discloses a system and a method for treating copper slag by an annular roasting furnace. The system comprises a batching system, a lubricating and polishing system, a pelletizing system, a drying system, the annular roasting furnace and an ore grinding magnetic separation system; the annular roasting furnace includes a furnace body, a furnace bottom, a retaining wall, a feed port, a discharge port, a flue, a radiation pipe and a combustor; the retaining wall is positioned in the furnace body for dividing an annular space in the furnace body into a low-temperature reduction area, a grain growth area and a cooling area in sequence; and cooling equipment is arranged in the cooling area. The system and the method divide the annular roasting furnace into the low-temperature reduction area, the grain growth area and the cooling area to treat the copper slag, obtain iron powder through treatment by the ore grinding magnetic separation system, and collect smoke generated by the annular roasting furnace to obtain valuable metal dust to realize comprehensive recycling of the copper slag.

Description

technical field [0001] The invention belongs to the technical field of smelting, and in particular relates to a system and a method for processing copper slag in an annular roasting furnace. Background technique [0002] Precious metal resources are scarce and expensive, and more and more countries around the world pay more and more attention to them. Precious metal industrial waste is a very valuable secondary resource among the precious metal resources that are increasingly scarce in the world today. Effective treatment and utilization of these industrial waste has considerable economic benefits. value. [0003] Copper slag refers to the copper-containing slag produced in the process of pyrometallurgy. my country's copper production is dominated by pyrometallurgy, and 1 ton of copper produced by pyrometallurgy will produce 2 to 3 tons of slag. Based on the 1,923,300 tons of copper output in 2014, about 3,846,600 to 5,769,900 tons were produced in just one year, and the am...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B1/242C22B5/10C22B7/04B02C21/00B03C1/00
CPCB02C21/00B03C1/00C22B1/02C22B1/2406C22B1/242C22B5/10C22B7/04Y02P10/20
Inventor 任中山闫方兴徐刚曹志成薛逊吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST