Method for treating copper slag by rotary hearth furnace

A rotary hearth furnace and copper slag technology, applied in the field of metallurgy, can solve the problems of low iron grade, no recovery of zinc element, low metal recovery rate and other problems in grinding products, achieve less dust content, improve reduction efficiency and metallization rate, The effect of high zinc oxide content

Active Publication Date: 2021-12-03
THERMONERGY HIGH TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The process uses hydrogen as a reducing agent, which solves the problems of low metallization rate, low iron grade of grinding products and low metal recovery rate in the reduction process, but the invention does not recover the zinc element in copper slag

Method used

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  • Method for treating copper slag by rotary hearth furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The copper slag contains 41.63wt% of TFe, 2.15wt% of Zn, 33.12wt% of SiO2, 2.23wt% of CaO and 3.36wt% of Al2O3.

[0045] A novel copper slag processing method comprises the following steps:

[0046] (1) Raw material processing: Select high-volatile coal with volatile content of 30-50% and ash content <10%, and divide it into two parts—high-volatile coal one and high-volatile coal two, and high-volatile coal one and high-volatile coal The limestone is ground to a particle size of 100-200 mesh, and the high-volatile coal is crushed to a particle size of 5-25mm.

[0047] (2) Batching and mixing: select 100 parts of copper slag, 15 parts of high volatile coal, 10 parts of limestone, and 2 parts of bentonite, mix according to proportion.

[0048] (3) Molding: prepare the mixed material into a wet molding material with a water content of 10% and a particle size of 20mm.

[0049] (4) Material drying: dry and dehydrate the wet molding material, and the moisture content of the...

Embodiment 2

[0056] The copper slag contains 41.63wt% of TFe, 2.15wt% of Zn, 33.12wt% of SiO2, 2.23wt% of CaO and 3.36wt% of Al2O3.

[0057] A novel copper slag processing method comprises the following steps:

[0058] (1) Raw material processing: Select high-volatile coal with volatile content of 30-50% and ash content <10%, and divide it into two parts—high-volatile coal one and high-volatile coal two, and high-volatile coal one and high-volatile coal The limestone is ground to a particle size of 100-200 mesh, and the high-volatile coal is crushed to a particle size of 5-25 mm.

[0059] (2) Batching and mixing: select 100 parts of copper slag, 18 parts of high volatile coal, 10 parts of limestone, and 3 parts of bentonite, mix according to proportion.

[0060] (3) Molding: prepare the mixed material into a wet molding material with a water content of 10% and a particle size of 20mm.

[0061] (4) Material drying: dry and dehydrate the wet molding material, and the moisture content of th...

Embodiment 3

[0068] The copper slag contains 41.63wt% of TFe, 2.15wt% of Zn, 33.12wt% of SiO2, 2.23wt% of CaO and 3.36wt% of Al2O3.

[0069] A novel copper slag processing method comprises the following steps:

[0070] (1) Raw material processing: Select high-volatile coal with volatile content of 30-50% and ash content <10%, and divide it into two parts—high-volatile coal one and high-volatile coal two, and high-volatile coal one and high-volatile coal The limestone is ground to a particle size of 100-200 mesh, and the high-volatile coal is crushed to a particle size of 5-25mm.

[0071] (2) Batching and mixing: select 100 parts of copper slag, 20 parts of high volatile coal, 10 parts of limestone, and 3 parts of bentonite, mix according to proportion.

[0072] (3) Molding: prepare the mixed material into a wet molding material with a water content of 10% and a particle size of 20mm.

[0073] (4) Material drying: dry and dehydrate the wet molding material, and the moisture content of the...

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Abstract

The invention relates to a method for treating copper slag by a rotary hearth furnace. The method comprises the steps of raw material treatment, burdening, mixing, forming, material drying, roasting reduction, flue gas treatment, finished product cooling, ore grinding, magnetic separation and iron powder cold pressing, and adopts a hydrocarbon combined reduction technology to reduce iron oxide into metal iron, reduce zinc oxide into metal zinc, volatilize, oxidize and collect, so that Fe2SiO4 in the copper slag can be efficiently reduced, the metallization rate of direct reduction iron of an intermediate product can reach 90% or above, the zinc removal rate reaches 95% or above, and the iron recovery rate of the whole process reaches 85% or above; the hydrocarbon combined reduction technology is adopted, the reduction temperature is low, and the energy consumption is low. according to the process, the reduction temperature is 800-1230 DEG C; hydrogen is adopted as a main reducing agent in the later stage of reduction, a by-product is water, green and environment-friendly effects are achieved, and the carbon emission amount of treated copper slag per ton is 50-70% of that of a carbon metallurgy rotary hearth furnace process; and the reduction coal in the process is low-rank coal instead of anthracite, so that the cost is low.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for treating copper slag in a rotary hearth furnace. Background technique [0002] Copper slag is the slag produced during the copper smelting process. About 2.2 tons of smelting slag will be produced for every ton of copper produced. Based on the scale of copper production in 2019 of 9.784 million tons, the annual smelting waste slag produced is more than 20 million tons. The chemical composition of copper slag is SiO2: 30%-40%, Fe: 27%-40%, Zn: 1%-3%. The main phase is fayalite, which is extremely difficult to recover. At present, most copper smelting enterprises sell part of the copper slag to building material enterprises to be used as cement additives and bricks, and part of it is stockpiled, and the valuable metals in the smelting slag are not recovered to the maximum extent. In the case of lower profits and increasingly stringent environmental protection requi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/00C22B1/02C22B1/243C22B7/04C22B19/30C22B19/34
CPCC22B7/04C22B7/002C22B1/02C21B13/0066C21B13/0073C22B1/243C22B19/34C22B19/30Y02P10/20
Inventor 王汝芳王秋影冯鲁兴
Owner THERMONERGY HIGH TECH CO LTD
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