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A method of utilizing non-ferrous metal smelting slag

A technology for non-ferrous metals and smelting slag, which is applied in the improvement of process efficiency and cement production, can solve the problems of low utilization rate of smelting slag, low waste conversion rate, waste of metal resources, etc. The effect of protection and process link reduction

Active Publication Date: 2018-07-03
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Abstract
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AI Technical Summary

Problems solved by technology

The slag not only contains 40% to 50% iron elements, but also contains some non-ferrous metal elements, which are extremely corrosive. In addition, during the long-term open-air stacking process, the metal elements in the waste slag are easily released after natural weathering and rain. into the surrounding environment, which not only caused immeasurable serious pollution to the surrounding ecological environment, but also wasted a lot of metal resources
At present, the use of non-ferrous metal smelting slag focuses on recycling the metal resources in it. During the utilization process, a large amount of secondary slag will be produced. After calculation, every ton of copper slag used will produce 0.7 tons of secondary slag. Currently, there is no effective process, thus resulting in low utilization rate of smelting slag and low waste conversion rate

Method used

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  • A method of utilizing non-ferrous metal smelting slag

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Raw material preparation:

[0023] Non-ferrous metal smelting slag: Jinchuan copper smelting slag MgO<5%, iron 40%;

[0024] Reducing agent: lignite, anthracite, bituminous coal;

[0025] Solvent: limestone, fluorite, industrial alkali;

[0026] Binder: bentonite;

[0027] Additives: calcium oxide, aluminum oxide.

[0028] (1) Fully mix non-ferrous metal smelting slag, reducing agent, solvent, and binder in a weight ratio of 1:0.2:0.3:0.05 and then pelletize;

[0029] (2) Dry the mixture and then reduce it: put the dried pellets into the reduction furnace, and pass through the inert protective gas, and heat it to 800°C in the furnace for 30 minutes, and the metallization rate can be 85. %~93% of metal pellets, the mixture mainly completes the preheating, heating and reduction processes at this temperature;

[0030] (3) Heat the reduction product of step (2) to the heating furnace, heat to 1500°C, and separate the slag and iron. After smelting, the molten iron enter...

Embodiment 2

[0032] Raw material preparation:

[0033] Non-ferrous metal smelting slag: Jinchuan nickel smelting slag MgO<5%, containing 50% iron;

[0034] Reducing agent: coke powder, lignite, anthracite;

[0035] Solvents: lime, sodium carbonate, fluorite;

[0036] Binder: starch;

[0037] Additives: calcium fluoride and aluminum oxide.

[0038] (1) Fully mix non-ferrous metal smelting slag, reducing agent, solvent, and binder in a weight ratio of 1:0.3:0.3:0.1 and then pelletize;

[0039] (2) Reduction after drying the mixture: put the dried pellets into the reduction furnace, and pass through the inert protective gas, and heat it to 1300°C in the furnace for 10 minutes, and the metallization rate can be 85. %~93% of metal pellets, the mixture mainly completes the preheating, heating and reduction processes at this temperature;

[0040] (3) Heat the reduction product of step (2) to the heating furnace, heat to 1700°C, and separate the slag and iron. After smelting, the molten iron ...

Embodiment 3

[0042] Raw material preparation:

[0043] Non-ferrous metal smelting secondary slag: Yunnan copper smelting secondary slag, MgO<5%, iron 45%;

[0044] Reducing agent: coke powder;

[0045] Solvent: limestone;

[0046] Binder: bentonite, starch;

[0047] Additive: calcium fluoride.

[0048] (1) Fully mix the non-ferrous metal smelting slag, reducing agent, solvent and binder according to the weight ratio of 1:0.25:0.2:0.07 and then pelletize;

[0049] (2) Dry the mixture and then reduce it: put the dried pellets into the reduction furnace, and pass through the inert protective gas, and heat it to 1100°C in the furnace for 20 minutes, and the metallization rate of 85 can be obtained. %~93% of metal pellets, the mixture mainly completes the preheating, heating and reduction processes at this temperature;

[0050] (3) Heat the reduction product of step (2) to the heating furnace, heat to 1600 ° C, and separate the slag and iron. After smelting, the molten iron enters the molt...

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Abstract

The invention discloses a non-ferrous metal smelting slag utilization method. The non-ferrous metal smelting slag utilization method is used for manufacturing iron alloy and cement clinker and comprises the following steps that non-ferrous metal smelting slag, reducing agents, solvents and binders are sufficiently and uniformly mixed according to the weight ratio, pelletized and then reduced; reduction is conducted for 10-30 min at the temperature of 800 DEG C-1300 DEG C, then, reduction products are heated to be 1500 DEG C-1700 DEG C, and iron and slag are separated; and molten iron is used for producing the iron alloy, and slag water is converted into the cement clinker. According to the non-ferrous metal smelting slag utilization method, metal and gangue components in the smelting slag are utilized at the same time, and energy consumption is reduced; in addition, the metal smelting slag is completely utilized, and no secondary waste slag is produced; smelting secondary slag serves as a valuable component to be used for producing cement, process links are greatly decreased, dust is reduced, exhaust gas pollution is relieved, and the product market application field is broadened; and more importantly, the current stacked and abandoned smelting waste slag can be processed, no new solid waste is produced, economic interests are achieved, and meanwhile the environment is protected.

Description

technical field [0001] The invention relates to a method for utilizing smelting slag, in particular to a method for utilizing nonferrous metal smelting slag. Background technique [0002] At present, in the process of non-ferrous metal production in my country, a large amount of iron-containing waste residues are produced. The slag not only contains 40% to 50% iron elements, but also contains some non-ferrous metal elements, which are extremely corrosive. In addition, during the long-term open-air stacking process, the metal elements in the waste slag are easily released after natural weathering and rain. Into the surrounding environment, this not only caused immeasurable serious pollution to the surrounding ecological environment, but also wasted a lot of metal resources. At present, the use of non-ferrous metal smelting slag focuses on recycling the metal resources in it. During the utilization process, a large amount of secondary slag will be produced. After calculation,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/04C04B7/147
CPCC04B7/147C22B7/001C22B7/04Y02P10/20Y02P40/10
Inventor 谢庚李欣赵杰
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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