Steel slag recycling and utilization method

A steel slag recovery and steel slag technology, applied in the direction of improving process efficiency, etc., can solve the problems of incomplete separation, harsh industrial production, slow cooling speed, etc., and achieve the effects of low cost, favorable recycling, and improved grade

Inactive Publication Date: 2019-03-15
邳州高新区城市矿产研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of the slow cooling and flotation method is that the separation is not complete, and it is required that the FeO+Fe2O3+MnO in the steel slag must reach more than 30%. At the same time, it requires a high cooling start temperature and a very slow cooling rate in the high temperature section to meet the requirements of the phosphorus element. Floating requirements, these conditions are extremely harsh for industrial production
However, the above-mentioned methods all have their own defects, and there is no effective method to obtain industrial application at present.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A method for recycling steel slag. Steel slag is added as a raw material to sintering, ironmaking or steelmaking processes as a flux in a certain proportion. It is characterized in that steel slag is dephosphorized by flotation and then added to sintering, ironmaking Or in the steelmaking process; the specific process of dephosphorizing steel slag by flotation includes the following steps performed in sequence:

[0015] 1) The preparation of magnetically separated steel slag powder, that is, the steel slag is treated by hot splashing method, hot stuffing method or drum method to promote the separation of metallic iron and slag in the steel slag, and then multi-stage crushing and magnetic separation to obtain the powder with a particle size of less than 10mm. Magnetic separation of steel slag powder;

[0016] 2) Grinding of magnetically separated steel slag powder, that is, finely grinding the magnetically separated steel slag powder in a ball mill to pass through a 200 ...

Embodiment 2

[0018] A method for recycling steel slag. Steel slag is added as a raw material to sintering, ironmaking or steelmaking processes as a flux in a certain proportion. It is characterized in that steel slag is dephosphorized by flotation and then added to sintering, ironmaking Or in the steelmaking process; the specific process of dephosphorizing steel slag by flotation includes the following steps performed in sequence:

[0019] 1) The preparation of magnetically separated steel slag powder, that is, the steel slag is treated by hot splashing method, hot stuffing method or drum method to promote the separation of metallic iron and slag in the steel slag, and then multi-stage crushing and magnetic separation to obtain the powder with a particle size of less than 10mm. Magnetic separation of steel slag powder;

[0020] 2) Grinding of magnetically separated steel slag powder, that is, finely grinding the magnetically separated steel slag powder in a ball mill to pass through a 200 ...

Embodiment 3

[0022] A method for recycling steel slag. Steel slag is added as a raw material to sintering, ironmaking or steelmaking processes as a flux in a certain proportion. It is characterized in that steel slag is dephosphorized by flotation and then added to sintering, ironmaking Or in the steelmaking process; the specific process of dephosphorizing steel slag by flotation includes the following steps performed in sequence:

[0023] 1) The preparation of magnetically separated steel slag powder, that is, the steel slag is treated by hot splashing method, hot stuffing method or drum method to promote the separation of metallic iron and slag in the steel slag, and then multi-stage crushing and magnetic separation to obtain the powder with a particle size of less than 10mm. Magnetic separation of steel slag powder;

[0024] 2) Grinding of magnetically separated steel slag powder, that is, finely grinding the magnetically separated steel slag powder in a ball mill to pass through a 200-...

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Abstract

The invention discloses a steel slag recycling and utilization method, which adds steel slag as a raw material into a sintering, iron making or steel making process as a flux according to a certain proportion, and is characterized in that the steel slag is subjected to dephosphorization treatment by flotation to be added to the sintering, iron making or steel making process. The invention can realize the recycling and utilization of the steel slag after dephosphorization, reduce the phosphorus enrichment effect brought by the direct recycling of the steel slag, has the advantages of simple operation, low cost, is suitable for practical use, and can realize the quick and efficient dephosphorization of the steel slag for recycling. The effect of the steel slag iron grade can be improved to some extent, and the iron resources in the steel slag can be fully utilized.

Description

technical field [0001] The invention belongs to the technical field of metallurgical secondary resource reuse, and in particular relates to a treatment method for removing phosphorus in steel slag by using a flotation process and then recycling it. Background technique [0002] In order to realize the resource reuse of steel slag, metallurgists have studied a variety of steel slag dephosphorization technologies, including slow cooling and floating using density differences, carbothermal reduction dephosphorization, silicon thermal reduction dephosphorization, magnetic separation dephosphorization, etc. The disadvantage of the slow cooling and flotation method is that the separation is not complete, and it is required that the FeO+Fe2O3+MnO in the steel slag must reach more than 30%. At the same time, it requires a high cooling start temperature and a very slow cooling rate in the high temperature section to meet the requirements of the phosphorus element. These conditions ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/11
CPCC22B1/11Y02P10/20
Inventor 刘创
Owner 邳州高新区城市矿产研究院有限公司
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