Novel low-cost composite efficient converter exothermic compound and preparation method thereof

Abstract

The invention discloses a novel low-cost composite efficient converter exothermic compound and a preparation method thereof. The exothermic compound comprises the components of aluminum ash, iron ore and limestone, and the preparation method of the exothermic compound comprises the steps that the iron ore and the limestone are crushed and ground and then mixed with the aluminum ash in proportion, and then the exothermic compound is prepared after forming and drying. All used raw materials are low-cost wastes and minerals, the components and the preparation method are simple, a calorific value is large, an effect is direct and good, subsequent slagging and slag performance improvement are also facilitated while a temperature of converter smelting is rapidly increased, and the method is a low-cost, efficient and comprehensive utilization method of waste resources. According to a grinding and mixing all-in-one machine, grinding, water adding, mixing and stirring are achieved according to the preparation method and process requirements, the production efficiency is greatly improved, by means of the grinding and mixing all-in-one machine, a quantity and a particle size of a link are controllable, all links are linked with one another, a stirring process can be achieved while grinding is conducted, and production time is greatly saved.

Description

Technical field [0001] Technical Field The present invention relates to metallurgy, particularly to a converter with a low-cost and efficient new composite heat generating agent. Background technique [0002] With advances in ironmaking converter and a change of the metal material, now reduced silicon content in molten metal material appears converter, the scrap ratio increased features, the resulting shortage of the initial blowing heat converter, the slow slag, smelting time long, desulfurization dephosphorization capacity decreased, higher steel end oxygenated range of issues, converter blowing the initial rapid rise in temperature in the furnace to promote slag into the slag material quickly for critical reaction between slag and metal is to solve this set of problems. Using a heating agent is a rapid rise in converter furnace important adjunct, which is a general method of manufacturing the heat generating substance as a main raw material, with addition of additives to adjus...

AI Technical Summary

Problems solved by technology

[0004] First, the heating efficiency is insufficient and the cost of raw materials is high. Although it is a development trend to use recyclable materials as raw materials for converter heating agents, the currently developed converter heating agents are all carbonaceous (such as waste electrode powder, coke powder) or silicon Wastes such as cutting waste such as industrial silicon powder and silicon carbide powder are used as raw materials for exothermic agents. Due to the low effective components and low calorific value of these carbonaceous and silicon wastes, it is often necessary to add expensive metal or alloy silicon Aluminum to increase calorific value and use efficiency. For example, the patent No. CN102534091A discloses a kind of heating agent for steelmaking and its production method. Its additives are the following 1-2 kinds: silicon powder, aluminum powder, ferrosilicon powder, these metals and The purpose of adding alloy silicon and aluminum is to increase the calorific value. Considering that the calorific value is not enough when using photovoltaic cutting waste (metal silicon and silicon carbide) and industrial silicon carbide as the heat generating function, silicon powder and aluminum are added. One or two of expensive metals or alloys such as powder and ferrosilicon powder are used to assist heat generation, and aluminum ash is also waste, but it contains 15%-20% metal aluminum, so there is no need to worry about its heat generation not enough problem

[0005] The second is that the exothermic agent has a single purpose, and the product is not conducive to the slagging of the converter. At present, the carbon and silicon converter exothermic agents widely developed and used are generally only considered to increase the temperature of the converter, and do not pay much attention to the acidic substances such as silicon dioxide produced by the reaction. The impact on the subsequent converter slagging process, adding a large amount of slag-forming materials to produce alkaline converter slag is a key link in the steelmaking process. Due to the problem of the basicity of converter slag and the corresponding reduction in desulfurization and dephosphorization capabilities, more lime needs to be added to adjust the pH, which will increase the corresponding amount of slagging and heat consumption, which is not conducive to the slagging process of the converter

[0006] The third is that the use of the existing binder reduces the effective component content of the exothermic agent. The preparation of the converter exothermic agent often requires the use of a certain amount of adhesive to shape the exothermic agent to reduce the dust generated during use and improve the operating environment in front of the furnace. Currently used binders include two categories, one is inorganic binders containing a large amount of silicon represented by water glass and cement, which will bring acidic silica after use, and the other is The organic binders represented by methyl cellulose, starch, etc. are volatilized during the use of the heating agent, but it is obvious that no matter which type of binder is used, it has a certain weight ratio in the composition of the heating agent. However, the substances brought in are often not the active components of the converter slag and may even increase the slagging burden of the converter, which makes the use of existing binders reduce the effective component content of the exothermic agent

[0013] At the same time, there is no equipment used to cooperate with the production process of a low-cost new composite high-efficiency heating agent for converters of the present invention, and the production is strictly in accordance with the process requirements of the present invention, and the automatic and controllable operation of the production process cannot be realized.

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