Process method and equipment for producing slag-forming agent for making steel by utilizing steel making sludge

Abstract

The invention discloses a process method for producing a slag-forming agent for making steel by utilizing steel making sludge. The process method comprises the following steps of: conveying the steel making sludge to a rotary-drum drying machine to carry out drying to form a dry sludge material; carrying out coextrusion on the dry sludge material and adhesive bentonite by the weight ratio of 1:0.03 to form green balls; conveying the green balls into a medium-temperature shaft furnace for roasting to obtain finished ripe sludge balls; and adding the ripe sludge balls into into a converter in asteel making workshop by twice as the slag forming agent and a cooling agent for steel making of the converter. The production process disclosed by the invention has the advantages that the process problems of sludge drying, discontinuous production, secondary environmental pollution, high production cost, high water content and high sulfur content and the like are effectively solved, the production equipment is simple, the assembly is convenient, and the production process is simple. The invention is suitable for various-scale production and implementation.

Description

technical field [0001] The invention belongs to the field of resource utilization of dust removal sludge in metallurgical iron and steel enterprises, and relates to a process for producing steelmaking slagging agent using steelmaking sludge, in particular, using converter steelmaking wet dust removal sludge to produce converter steelmaking The production process and equipment of slagging agent and coolant. Background technique [0002] Iron and steel enterprises produce a large amount of dust in the process of converter steelmaking, which becomes sludge after wet dust removal. Converter steelmaking in iron and steel enterprises produces 10-30Kg of iron-containing dust for every ton of steel smelting, which contains more than 50% of total iron, and is a good steelmaking raw material. At present, most iron and steel enterprises in my country use steelmaking dust as sintering raw material, but there are many problems in the use of converter dust as sintering ingredients, mainl...

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Problems solved by technology

[0003] The most effective utilization of resources at this stage is to produce steelmaking sludge into steelmaking slagging agent. At present, the production process of using steelmaking sludge to produce steelmaking slagging agent mainly has the following types: one process is to use sewage The clay raw material is crushed after being dried or air-dried—adding lime powder to stir—balls through a high-pressure ball pressing mechanism—drying at room temperature—transported to a converter. The cold-set pellets produced by this process have low strength (300N) and a moisture content of ≥6%. , which is not conducive to the requirements of converter steelmaking, and the drying of pellets requires a large drying site, which will cause secondary environmental pollution during the drying process; the second process is similar to the first one, except that lime powder is changed into water glass After molding, it is dried at low temperature (below 300°C). This process solves the problem of low pellet strength (800N), and its moisture content is ≥ 1%, and does not require a drying site. However, the production cost of this production process Compared with the first method, it is not suitable for small-scale steel mills; the third method is to add bentonite to the sludge in proportion, and then roast the balls at a high temperature of 1000 degrees. The sludge balls produced by this process have high strength. , the moisture content is low, but the construction cost of the high-temperature shaft kiln is high, and it is difficult to burn through because of the large sludge ball particles (diameter 40mm). When the inside is burned through, the outside has been melted and bonded. In serious cases, the shaft furnace will be scrapped, and the process temperature is difficult to control.

[0004] The above several technological methods have the following defects in common: 1. The wet sludge adopts the method of drying, which has low production efficiency, large space occupation, and causes secondary environmental pollution; 2. All forced mixing mixers can only be fed intermittently and discharged intermittently. , can not be continuously produced, the utilization rate of equipment is low, and the output is small, which cannot meet the needs of sludge treatment and utilization in large-scale steelmaking enterprises; 3. The moisture content of the produced sludge pellets is ≥ 1% (converter steelmaking requires moisture ≤ 1%); 4. High sulfur content (the sulfur content is between 0.113-0.18%) and there is no desulfurization process. Converter steelmaking requires raw material sulfur content ≤ 0.045%, which cannot meet the requirements of steelmaking

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