Method for preparing cold-pressed ball for iron-making blast furnace and improving waste utilization rate

A technology of cold-pressed balls for iron-making blast furnaces, which is applied in the field of preparation of cold-pressed balls for iron-making blast furnaces. It can solve the problems of destroying the life of the furnace lining, affecting the smooth running of the blast furnace, and low resource utilization, so as to improve the ball forming rate and realize Efficient circular economy benefits, the effect of reducing energy consumption

Inactive Publication Date: 2021-09-03
YANGCHUN NEW STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the method of treating solid waste such as steelmaking dust, converter mud fine particles, waste steelmaking suspended sludge, ironmaking gas ash, etc. is to directly add them to the batching tank and enter the blast furnace for ironmaking. This method has low resource utilization and solid waste. Potassium, sodium, lead, and zinc contained in the waste will be cyclically enriched after entering the blast furnace, which will seriously affect the forward operation of the blast furnace and damage the life of the furnace lining
At the same time, in the process of stacking and transporting ferrous solid waste materials, it will also bring a series of environmental protection problems, which need to be improved

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0020] The present invention proposes a method for preparing cold-pressed balls for ironmaking blast furnaces and improving the utilization rate of solid waste resources. The preparation method of cold-pressed balls comprises the following steps:

[0021] Step S1: Add steelmaking dust removal dust, converter mud fine particles, and waste steelmaking suspension sludge respectively into the intensive mixer, stir evenly and return to the stockyard to form a basic mixture, specifically, steelmaking dust removal dust, converter mud fine particles and The waste steelmaking suspended mud is added to the intensive mixer according to the following weight percentages, wherein the weight percentage of the steelmaking dust removal ash is 15% to 20%, the weight percentage of the converter mud fine particles is 40% to 45%, and the weight percentage of the waste steelmaking suspended mud is The weight percentage is 15% to 20%;

[0022] Step S2: Transfer the basic mixture of step S1 to the ra...

Embodiment 1

[0033] 1. Add 40% by weight of converter mud fine particles, 16% by weight of waste steelmaking suspension sludge, and 20% by weight of steelmaking dust removal ash into a strong mixer, stir for 10 minutes, and form a foundation after stirring evenly Mixture; the basic mixture is transferred to the raw material field for a digestion, and left to stand for 24 hours, so that various materials are fused together;

[0034] 2. When the mixture that has been digested once passes through the belt and the ash tank with a weighing device, add ironmaking gas ash with a weight percentage of 20% into the twin-shaft mixer for re-mixing, and transfer it to the digestion bin after 15 minutes. Second static digestion for more than 24 hours;

[0035] 3. Add 4% binder by weight to the digested basic mixture, stir twice for a total of 15 minutes, and form the total mixture after stirring evenly;

[0036] 4. Put the total material mixture into a ball briquetting machine, press it into a metal ba...

Embodiment 2

[0040] 1. Add 42% by weight of converter mud fine particles, 18% by weight of waste steelmaking suspension sludge, and 15% by weight of steelmaking dust ash into a strong mixer, stir for 15 minutes, and form a foundation after stirring evenly Mixture; the basic mixture is transferred to the raw material field for a digestion, and left to stand for 24 hours, so that various materials are fused together;

[0041] 2. When the mixture that has been digested once passes through the belt and the ash tank with a weighing device, add the ironmaking gas ash with a weight percentage of 22% into the twin-shaft mixer, mix it again for 15 minutes, and then transfer it to the digestion bin. Stand still and digest for more than 24 hours.

[0042] 3. Add 3% binder by weight to the basic mixture after digestion, stir twice for a total of 15 minutes, and form a total material mixture after stirring evenly;

[0043] 4. Put the total material mixture into the ball press machine, press it into me...

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Abstract

The invention discloses a method for preparing a cold-pressed ball for an iron-making blast furnace and improving a waste utilization rate. The method for preparing the cold-pressed ball comprises the following steps of S1, adding steelmaking precipitator dust, converter slurry fine particles and waste steelmaking suspended slurry into a powerful mixer to form basic mixtures; S2, letting the basic mixtures stand, and digesting for more than 24 hours; S3, adding iron-making gas ash when the mixtures after standing passes through a belt and an ash tank with a weighing device, remixing the mixture after entering a double-shaft stirrer, letting the mixtures stand for the second time and digesting for more than 24 hours; S4, adding a binder into the digested basic mixtures, and stirring the binder and the mixtures twice to form aggregate mixtures; S5, adding the aggregate mixtures into a ball press machine to prepare the cold-pressed ball; and S6, naturally stacking and airing a cold-pressed block for more than 24 hours. According to the method for preparing the cold-pressed ball for the iron-making blast furnace and improving the resource utilization rate of solid wastes, the waste of resources is reduced, and the metal utilization rate in the solid wastes is improved.

Description

technical field [0001] The invention relates to the technical field of metallurgical waste treatment, in particular to a method for preparing cold-pressed balls for ironmaking blast furnaces and improving waste utilization. Background technique [0002] In the process of iron and steel smelting, a large amount of industrial solid waste will be generated in sintering, ironmaking, steelmaking and other production processes. Due to the large fluctuation of total iron content of these secondary iron-containing materials, they are returned to the raw material yard and mixed into sintering pairs for sintering. The output and quality of the ore will have a certain impact, and it will be dumped into the slag yard for stacking, and dust will easily be generated during the transportation and mixing process, which not only seriously affects the ecological environment, but also causes waste of resources. Therefore, how to rationally use resources, reduce energy consumption, improve the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/244C21B5/00
CPCC22B1/2406C22B1/244C21B5/008C21C2200/00
Inventor 程祥许铁其钟立明方喆
Owner YANGCHUN NEW STEEL CO LTD
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