Fayalite type furnace slag resource recycling method

A resource recovery and fayalite technology, applied in the field of mineral engineering, can solve the problems of secondary slag, low iron recovery rate, and difficulty in taking into account the recovery of silicon resources, etc., to achieve high-efficiency separation, low cost, and resource utilization.

Active Publication Date: 2019-12-10
WUHAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the main problems of this method are the low iron recovery rate, the generation of secondary sla

Method used

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  • Fayalite type furnace slag resource recycling method
  • Fayalite type furnace slag resource recycling method

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Experimental program
Comparison scheme
Effect test

Embodiment approach

[0047] The main chemical components of the copper slag and nickel slag used in this embodiment are shown in Table 1.

[0048] The chemical composition (wt.%) of table 1 copper slag and nickel slag

[0049]

specific Embodiment approach 1

[0051] Step S1, carry out ore blending with silicon oxide molar ratio 1:1 in sodium carbonate and copper slag, add carbon powder during ore blending, the addition amount of carbon powder at this moment is that iron oxide is reduced to 200% of the theoretical amount of metal iron, obtains Raw material;

[0052] Step S2, reducing and roasting the mixed raw meal at 1100° C. for 60 minutes to completely decompose ferrous silicate into metallic iron and sodium silicate. At this time, the content of zinc in the roasted clinker is 0.04%;

[0053] Step S3, the calcined clinker is ground to a particle size of d0.5≤39 ​​μm, and leached in water at a leaching temperature of 90° C., a liquid-solid ratio of 5:1, and an leaching time of 120 minutes.

[0054] Step S4, performing solid-liquid separation on the leached pulp to obtain sodium silicate solution and leaching slag; under the conditions of the above step S3, the dissolution rate of silicon oxide is 88.5%;

[0055] Step S5, carboniz...

specific Embodiment approach 2

[0057] Step S1, carry out ore blending with silicon oxide molar ratio 1:3 in sodium carbonate and copper slag, add carbon powder during ore blending, the addition amount of carbon powder at this moment is that iron oxide is reduced to 150% of the theoretical amount of metal iron, obtains Raw material;

[0058] Step S2, reducing and roasting the mixed raw meal at 1000° C. for 60 minutes to completely decompose ferrous silicate into metallic iron and sodium silicate. At this time, the content of zinc in the roasted clinker is 0.03%;

[0059] Step S3, the calcined clinker is ground to a particle size of d0.5≤39 ​​μm, and leached in water at a leaching temperature of 80° C., a liquid-solid ratio of 3:1, and an leaching time of 60 minutes.

[0060] Step S4, performing solid-liquid separation on the leached pulp to obtain sodium silicate solution and leaching slag; under the conditions of the above step S3, the dissolution rate of silicon oxide is 86.85%;

[0061] Step S5, carboniz...

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Abstract

The invention provides a fayalite type furnace slag resource recycling method, and relates to a mineral engineering technology. The method comprises the following steps of carrying out ore proportioning on furnace slag, sodium carbonate and a reducing agent, grinding and uniformly mixing the mixture to obtain a raw material, wherein the furnace slag comprises at least one of copper slag and nickelslag; carrying out reduction roasting on the raw material to obtain a clinker; grinding the clinker, and then adding the ground clinker into water for leaching; carrying out solid-liquid separation on the leached ore pulp, and separating to obtain a sodium silicate solution and leached residues; carrying out carbon separation on the sodium silicate solution to obtain a white carbon black and a sodium carbonate solution; and carrying out iron-copper separation on the leached residues to obtain iron ore concentrate and a copper-rich product. According to the method, efficient separation of zinc, iron, silicon and copper in the fayalite type furnace slag can be realized, and resource utilization can be performed correspondingly. The fayalite type furnace slag resource recycling method is simple in process flow and low in cost, can realize resource utilization of intractable fayalite type furnace slag such as copper slag, nickel slag and the like, and has a wide application prospect and good economic benefits.

Description

technical field [0001] The invention relates to the technical field of mineral engineering, in particular to a method for recovering fayalite-type slag resources. Background technique [0002] Fayalite-type slag refers to the slag with fayalite as the main phase produced in the process of pyrometallurgy, mainly including copper slag, nickel slag, etc. About 2.2 tons of copper slag will be produced for every ton of metal copper produced by pyrotechnics. my country will produce about 20 million tons of copper slag every year, and its stockpiles have exceeded 50 million tons. Nickel metallurgy is similar to copper metallurgy, and a large amount of nickel slag is also produced in the process of pyrometallurgy. In recent years, the annual discharge of nickel slag in my country has exceeded 30 million tons, and it has become the fourth largest metallurgical slag in my country after iron slag, steel slag and red mud. The chemical composition of copper slag and nickel slag will be...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B1/02C22B15/00C22B23/00C22B19/30C22B19/20C01B33/12
CPCC01B33/12C22B1/02C22B7/006C22B7/04C22B15/0065C22B19/20C22B19/30C22B23/0407Y02P10/20
Inventor 王洪阳宋少先
Owner WUHAN UNIV OF TECH
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