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Process for preparing slag by pelletization of steel-making dust slime

A manufacturing process and technology of dust sludge, which is applied in the field of comprehensive utilization of steelmaking dust sludge, can solve the problems of difficult guarantee of thermal strength, large site maintenance, high cost of binder, etc., to reduce bursting phenomenon, ensure strength, and reduce cracking and fault effects

Inactive Publication Date: 2006-07-19
张清学
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Problems solved by technology

Generally speaking, the wheel kiln sintering method needs to be equipped with uniformly heated high-temperature equipment and extrusion equipment. Its disadvantages are large investment and high energy consumption. The sintered product needs to be broken into a certain particle size before it can be used in steelmaking; The group method is to dry the steelmaking dust to a certain extent, add various binders, press the balls, and then carry out natural stacking and maintenance to obtain a certain strength. The disadvantage of this process is that it requires a large space And long-term maintenance, the cost of the binder used is relatively high, and the obtained pellet strength, especially the hot strength, is difficult to guarantee

Method used

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  • Process for preparing slag by pelletization of steel-making dust slime

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Embodiment

[0024] A batch of raw materials of steelmaking dust and mud after natural air drying is mixed with 5% quicklime and 0.7% binder to make a primary mixture; the primary mixture is mixed with the returned material for the second time, and 4 tons of secondary mixture are taken Send to the spiral mixer through the belt conveyor for stirring for 5 minutes, then send it to the wheel mill for wheel milling through the belt conveyor, and then send it to the double-roller pelletizing machine for pelletizing through the belt conveyor after 10 minutes of wheel milling; when pelletizing, mix The moisture content of the material is controlled at 10%, and the pressure is controlled at 50KN; the green pellets produced are passed through a vibrating screen, and the green pellets on the screen are loaded into the hopper through the feeding system and sent to the shaft furnace for consolidation, and the crushed material under the screen is returned to the mixer as return material Reuse: After the...

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Abstract

The invention relates to a comprehensive utilization method of dust and mud in steelmaking process, which is specifically a spheroiditic slagging agent production process. The invention comprises the following steps: drying dust and mud in the open, adding 2-6% burnt lime and 0.5-1% adhensive to the mud to produce mixture, sending the mixture to agitator to intimate mixing, sending the mixture to roller to be pulverized fully, sending it to pelletizer to produce green-ball of phi20-phi30mm size by roll-type briquetting process in presure of 40-60KN, processing green-ball in jigging screen to get green-ball end product on sifter and sliver as return material under sifter and sending green-ball to tower furnace via charging system to be adglutinate and get end product.

Description

technical field [0001] The invention relates to a comprehensive utilization technology of steelmaking dust and mud, in particular to a manufacturing process of a steelmaking dust and mud pelletizing agent for steelmaking. Background technique [0002] At present, the comprehensive utilization technology of steelmaking dust is mainly to process steelmaking dust into steelmaking slag agent, which is returned to steelmaking production and application. The steelmaking process research and production application show that steelmaking dust is used as steelmaking slag agent. Slag agent, with cooling, slag, dephosphorization, desulfurization and other functions. In the existing technology of processing steelmaking dust into steelmaking slag agent, there are mainly wheel kiln sintering method and cold pressing pelletizing method. Generally speaking, the wheel kiln sintering method needs to be equipped with uniformly heated high-temperature equipment and extrusion equipment. Its disa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/36C21C7/076B30B9/28
CPCY02P10/20
Inventor 张清学吕心刚张怀宾孟永刚张道刚张仲波李子林赵振峰陈铁军王锐张玉林赵海修步云生毛尽华田晓霞马越
Owner 张清学
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