Method for recovering sludge from smelting ironmaking

A technology of ironmaking sludge and recycling method, which is applied in the direction of improving process efficiency, etc., can solve the problems of not too high usage ratio, high cost, complicated process, etc., and achieve the goals of reducing fuel consumption, reducing recycling, and avoiding a large amount of accumulation Effect

Active Publication Date: 2013-02-13
XINJIANG BAYI IRON & STEEL
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Although there are many metallurgical sludge recycling technologies disclosed at present, they are not perfect enough. The method of directly using it as a raw material for sintering requires a sintering process and a higher iron grade.
The method used as pellet raw material also needs to build a pellet plant, and there is a problem that the proportion of use should not be too high
As a method for preparing iron oxide black and iron red pigment raw materials, there are also disadvantages that the scale is not large and all sludge cannot be used
The recycling method of blast furnace ironmaking sludge with high zinc content also has the problems of complicated process and high cost
Therefore, for the smelting ironmaking process without sintering process, it is impossible to achieve economically feasible large-scale recycling of solid waste such as sludge by using the above-mentioned technology. Therefore, it is necessary to explore a simple and economically feasible smelting ironmaking process according to the actual situation. Sludge recovery method

Method used

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  • Method for recovering sludge from smelting ironmaking

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Effect test

Embodiment 1

[0038] Recycling and utilization of sludge with a moisture content of 10% after dehydration, the ratio of sludge, binder, iron ore or pellet under-screen powder or the mixture of the two is: sludge 55%, binder 15% , 30% of iron ore or pellet under sieve powder or a mixture of the two. The binder is 50% Portland cement + 50% diatomaceous earth, the particle size of iron ore or pellet under-sieve powder is less than 3.15mm, the amount is more than 90%, the moisture content of the mixture is 10%, and the molding pressure is 10MPa , and cured for 2 hours in a steam atmosphere. After the curing is completed, it will be fed into the melting gasifier through the screw feeder together with coal, coke and flux.

[0039] This embodiment can make the briquette strength reach 1716N, fully meeting the strength requirements for directly feeding into the gasifier. If calculated by recycling 400 tons of briquettes per day, 55-110 tons of iron and 44-88 tons of carbon powder can be recovered...

Embodiment 2

[0041]Recycling sludge with moisture content of 15% after dehydration, the proportion of sludge and binder, iron ore or pellet under-screen powder or the mixture of the two is: sludge 45%, binder 13% , iron ore or pellets under sieve powder or a mixture of the two 42%. The binder is 40% Portland cement + 30% slag cement + 30% diatomaceous earth, the iron ore or pellet under-sieve powder with a particle size less than 3.15mm is more than 95%, and the moisture content of the mixture is 15% , The molding pressure is 15MPa, and it is cured in a steam atmosphere for 4 hours. After the curing is completed, it will be fed into the melting gasifier through the screw feeder together with coal, coke and flux.

[0042] This embodiment can make the strength of the briquette reach 2574N, fully meeting the strength requirement for directly feeding into the gasifier. If calculated by recycling 400 tons of briquettes per day, 45-90 tons of iron and 36-72 tons of carbon powder can be recover...

Embodiment 3

[0044] Recycling sludge with moisture content of 20% after dehydration, the proportion of sludge and binder, iron ore or pellet under-screen powder or the mixture of the two is: sludge 30%, binder 10% , 60% of iron ore or pellet sieve powder or a mixture of the two. The binder is 30% Portland cement + 40% slag cement + 30% diatomaceous earth, iron ore or pellets with a particle size less than 3.15mm is 100%, and the moisture content of the mixture is 18% , The molding pressure is 20MPa, and it is cured in a steam atmosphere for 12 hours. After the curing is completed, it will be fed into the melting gasifier through the screw feeder together with coal, coke and flux.

[0045] This embodiment can make the strength of the briquette reach 3361N, fully meeting the strength requirements for directly feeding into the gasifier. If calculated by recycling 400 tons of briquettes per day, 30-60 tons of iron and 24-48 tons of carbon powder can be recovered from sludge a day, which can ...

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Abstract

The invention relates to a method for recovering and utilizing dewatered sludge from smelting reduction ironmaking process. A method for recovering sludge from smelting ironmaking comprises the following steps: firstly, dewatering ironmaking sludge to obtain a water content of 10-25%; secondly, mixing the sludge, a binder, minus sieve powder of iron ore or pellet ore, or a mixture of the two types of minus sieve powder according to the following weight percents, that is, 30-55% of the sludge, 10-15% of the binder, and 30-60% of the minus sieve powder of iron ore or pellet ore, or a mixture of the two types of minus sieve powder; during mixing, additionally adding 1-15% of water to maintain the water content of the mixed materials to be 10-18%; thirdly, pressing and molding the well mixed materials by a press; fourthly, curing the mixed materials after molding; fifthly, briquetting the cured mixed materials, feeding the briquetted mixed materials with coal, coke, and flux into a smelting gasifier through a screw feeder. The invention realizes the recovery and utilization of sludge from smelting ironmaking, reduces molten iron cost, and reduces environment pollution.

Description

technical field [0001] The invention relates to the recovery and utilization of solid waste in the smelting reduction ironmaking process, in particular to a method for recycling dewatered sludge in the smelting reduction ironmaking process. Background technique [0002] The smelting ironmaking process is an environmentally friendly non-blast furnace ironmaking process. Compared with blast furnace ironmaking, sintering and coking are canceled, but because of the cancellation of the sintering process, it loses a recycling of its own sludge and other efficient way of solid waste. At present, the amount of sludge produced by one molten ironmaking device is about 200 tons a day. For a steel plant with two molten ironmaking devices, about 400 tons of sludge needs to be treated a day. Since there is no sintering process, the direct It is very difficult to use, which not only causes a large amount of accumulation, occupies land, pollutes the environment, but also has a certain impa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/24C21B11/00
CPCY02P10/20
Inventor 熊林李建石洪志朱锦明林金嘉李咸伟赵晓岩
Owner XINJIANG BAYI IRON & STEEL
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