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Method and system for manufacturing cooled slag-making pellets from steel plant dedusting ash or steel plant sludge

A technology for steel mill sludge and slag balls, applied in the field of iron and steel metallurgy, can solve the problems of high equipment investment, low quality, high energy consumption, etc., and achieve the effects of improving quality, reducing costs, and being beneficial to energy conservation and emission reduction.

Active Publication Date: 2015-02-25
江阴市元丰环保工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method and system for making cooling slagging pellets with steel mill dust or steel mill sludge with energy saving, environmental protection and good product quality. The deficiencies and unreasonableness of high energy consumption, high equipment investment, low output, and low quality in the sludge recycling method, after comprehensive consideration of various factors, the recycling process from raw material selection to equipment layout to process parameters etc. have been redesigned, and the design content includes:

Method used

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  • Method and system for manufacturing cooled slag-making pellets from steel plant dedusting ash or steel plant sludge

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Effect test

Embodiment 1

[0032] A method for making cooling slagging pellets with steel mill dust or steel mill sludge, comprising the steps of:

[0033] 1) Prepare steel mill dust or steel mill sludge, use dry collection method to collect steelmaking dust dust through a bag filter, and transport it to the pelletizing workshop; or use wet collection method to collect steelmaking dust through a paper, 2. Gravity dehydrator, elbow dehydrator, and wet spin dehydrator are brought into the sewage tank by the turbid ring water of the converter, and then into the sewage treatment equipment, and the sludge is transported to the pelletizing workshop after sedimentation;

[0034] 2), take the raw materials according to the mass ratio of 75% steel mill dust and / or steel mill sludge, 12% scale, and 13% bentonite and mix them uniformly;

[0035] 3), the above-mentioned mixture is fine-tuned with water and formed into pellets by briquetting; after adding a small amount of water, the moisture content in the mixture ...

Embodiment 2

[0040] A method for making cooling slagging pellets with steel mill dust or steel mill sludge, comprising the steps of:

[0041] 1) Prepare steel mill dust or steel mill sludge, use dry collection method to collect steelmaking dust dust through a bag filter, and transport it to the pelletizing workshop; or use wet collection method to collect steelmaking dust through a paper, 2. Gravity dehydrator, elbow dehydrator, and wet spin dehydrator are brought into the sewage tank by the turbid ring water of the converter, and then into the sewage treatment equipment, and the sludge is transported to the pelletizing workshop after sedimentation;

[0042] 2), take the raw materials according to the mass ratio of 80% steel mill dust and / or steel mill sludge, 17% scale, and 3% bentonite and mix them uniformly;

[0043] 3), the above-mentioned mixture is fine-tuned with water and formed into pellets by briquetting; after adding a small amount of water, the moisture content in the mixture a...

Embodiment 3

[0048] A method for making cooling slagging pellets with steel mill dust or steel mill sludge, comprising the steps of:

[0049] 1) Prepare steel mill dust or steel mill sludge, use dry collection method to collect steelmaking dust dust through a bag filter, and transport it to the pelletizing workshop; or use wet collection method to collect steelmaking dust through a paper, 2. Gravity dehydrator, elbow dehydrator, and wet spin dehydrator are brought into the sewage tank by the turbid ring water of the converter, and then into the sewage treatment equipment, and the sludge is transported to the pelletizing workshop after sedimentation;

[0050] 2), according to the mass ratio of steel mill dust and / or steel mill sludge 84%, scale 10%, bentonite 6% by weighing raw materials and mixing evenly;

[0051] 3), the above-mentioned mixture is fine-tuned with water and then formed into pellets by briquetting; after adding a small amount of water, the moisture content in the mixture ac...

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Abstract

The invention discloses a method and a system for manufacturing cooled slag-making pellets from steel plant dedusting ash or steel plant sludge. The preparation method comprises the following steps: 1), preparing the steel plant dedusting ash or the steel plant sludge; 2), in accordance with the mass ratio, weighting raw materials of 75-85% of the steel plant dedusting ash and / or the steel plant sludge, 10-20% of iron oxide scales and 2-15% of bentonite, and mixing evenly; 3), fine blending the mixture with water, and carrying out ball pressing and molding into pellets; 4), sending the prepared pellets into a closed still kettle, directly introducing steam, carrying out steam curing heating on the pellets, and allowing to generate a steam curing reaction, wherein a steam curing medium is water steam, the steam curing pressure is 0.05-1.4 MPa, the water steam temperature is 105 DEG-195 DEG C, and the steam curing time is 0.5-2 h; and 5), carrying out dust separation and screening on the product after steam curing, and thus finally obtaining the finished product. The cooled pellets are prepared by the method, so that the energy can be saved, the production equipment investment and the production cost are reduced, the production cycle is shortened, and the product quality is improved.

Description

technical field [0001] The invention belongs to the iron and steel metallurgical industry, and relates to a method for producing cooling slag pellets from dust or sludge in a steel mill. Background technique [0002] With the increasingly stringent requirements of environmental legislation, the requirements for environmental adaptability of iron and steel enterprises are also constantly increasing. Therefore, some technical methods to reduce energy consumption, reduce waste discharge and waste recycling and reuse have been vigorously promoted in steel mills. Some steel mill waste recovery and reuse technologies developed in recent years have been successfully applied. These technologies can achieve functions such as reducing waste discharge, saving waste disposal costs, and recycling some products containing Fe and Zn. Steel mill dust and steel mill sludge account for an important proportion of steel mill waste. If it can be recycled and reused, it will be of great signifi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/248C22B1/243
CPCC22B1/243C22B1/248
Inventor 殷本新金维涛金维海承向东
Owner 江阴市元丰环保工程有限公司
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