Treatment method for gradient utilization of steel slag

A disposal method, steel slag technology, applied in the direction of recycling technology, process efficiency improvement, solid separation, etc., can solve the problems of short service life of wear-resistant devices, unable to achieve more crushing and less grinding, unsatisfactory crushing effect, low metal recovery rate, etc. , to achieve the effect of reducing engineering construction costs, realizing economic value, and ensuring the production environment

Pending Publication Date: 2021-04-13
HUBEI POLYTECHNIC UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Similar to the above patents, domestic steel slag treatment is usually hot stuffy, cooling, and decomposition to select scrap steel with a larger particle size and magnetic separation powder. Due to technical bottlenecks, the steel sl

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  • Treatment method for gradient utilization of steel slag
  • Treatment method for gradient utilization of steel slag
  • Treatment method for gradient utilization of steel slag

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Effect test

Embodiment 1

[0035] The disposal method of a kind of steel slag cascade utilization that the present invention proposes, comprises the following steps:

[0036] S1 pre-crushing: Pre-crushing the steel slag with a jaw crusher, with a particle size of 5mm, and then secondary crushing of the pre-crushed steel slag, with a particle size of 1mm;

[0037] S11: Add potassium sodium tartrate to the steel slag after secondary crushing, and continue to stir and mix it for 5 minutes, and the mass ratio of steel slag to potassium sodium tartrate is 100:0.01;

[0038] S2 Magnetic Separation: Re-screen secondary crushed steel slag, steel slag with a particle size of less than 5mm is sent to the strong magnetic machine equipment, and iron fine particles with Mfe>60% are selected and stacked on the ground, and steel slag with a particle size larger than 5mm is returned to the raw material bin to continue Perform secondary crushing to form a closed loop;

[0039] S3 wet grinding: the remaining steel slag in

Embodiment 2

[0046] The disposal method of a kind of steel slag cascade utilization that the present invention proposes, comprises the following steps:

[0047] S1 pre-crushing: Pre-crushing the steel slag with a jaw crusher, with a particle size of 10mm, and then secondary crushing of the pre-crushed steel slag, with a particle size of 3mm;

[0048] S11: Add potassium sodium tartrate to the steel slag after secondary crushing, and continue to stir and mix it for 7 minutes, and the mass ratio of steel slag to potassium sodium tartrate is 100:0.02;

[0049] S2 Magnetic Separation: Re-screen secondary crushed steel slag, steel slag with a particle size of less than 5mm is sent to the strong magnetic machine equipment, and iron fine particles with Mfe>60% are selected and stacked on the ground, and steel slag with a particle size larger than 5mm is returned to the raw material bin to continue Perform secondary crushing to form a closed loop;

[0050] S3 wet grinding: the remaining steel slag in

Embodiment 3

[0057] The disposal method of a kind of steel slag cascade utilization that the present invention proposes, comprises the following steps:

[0058] S1 pre-crushing: Pre-crushing the steel slag with a jaw crusher, with a particle size of 30mm, and then secondary crushing of the pre-crushed steel slag, with a particle size of 4mm;

[0059] S11: Add potassium sodium tartrate to the steel slag after secondary crushing, and continue to stir and mix it for 9 minutes, and the mass ratio of steel slag to potassium sodium tartrate is 100:0.02;

[0060] S2 Magnetic Separation: Re-screen secondary crushed steel slag, steel slag with a particle size of less than 5mm is sent to the strong magnetic machine equipment, and iron fine particles with Mfe>60% are selected and stacked on the ground, and steel slag with a particle size larger than 5mm is returned to the raw material bin to continue Perform secondary crushing to form a closed loop;

[0061] S3 wet grinding: the remaining steel slag in

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Abstract

The invention relates to the technical field of steel slag utilization, in particular to a treatment method for gradient utilization of steel slag, and solves the problems of low metal recovery rate, unsatisfactory crushing effect, high energy consumption, short service life of wear-resistant devices and incapability of realizing 'more crushing and less grinding' of a steel slag treatment system due to the fact that steel slag is generally treated by hot braising, cooling and decomposing and then waste steel and magnetically separated powder with large particle sizes are selected in the prior art. The steel slag is treated through the processes of crushing, magnetic separation, screening, wet grinding and the like to obtain fine iron particles, fine iron powder, tailings, tail mud and other products, and the fine iron particles and the fine iron powder can be directly sold out. The secondary crushing process is designed to fully crush the steel slag, thereby reducing the average particle size of the steel slag, reducing the loss of wear-resistant devices of a ball mill, fully realizing 'more crushing and less grinding' and reducing the energy consumption; Multiple magnetic separation processes are matched with one another to improve the recovery rate of metal resources, and the existing problems of low grinding efficiency and high cost of steel slag are solved.

Description

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Claims

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Application Information

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Owner HUBEI POLYTECHNIC UNIV
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