A kind of low-cost composite high-efficiency exothermic agent for converter and preparation method thereof

Abstract

The invention discloses a low-cost novel composite high-efficiency exothermic agent for converters and a preparation method thereof. Its components include aluminum ash, iron ore and limestone. After mixing in proportion, it is formed and dried to prepare a heat generating agent. The raw materials used are all low-cost wastes and minerals. The composition and preparation method are simple, the calorific value is large, and the direct effect is good. The rapid temperature rise is also extremely beneficial for subsequent slag formation and improvement of slag performance. It is a low-cost and efficient comprehensive utilization method of waste resources. The grinding and mixing machine realizes grinding and water addition according to its preparation method and process requirements Mixing and stirring greatly improves the production efficiency, and the amount of this link is controllable and the particle size is controllable through the integrated grinding and mixing machine. time.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a low-cost composite high-efficiency exothermic agent for converters. Background technique [0002] With the progress of ironmaking technology and the change of metal materials for converters, the current metal materials for converters have the characteristics of reduced silicon content in molten iron and increased scrap ratio, resulting in insufficient heat in the converter at the initial stage of blowing, slow slag melting, and smelting time. The key to solving this series of problems is the rapid increase of the furnace temperature in the early stage of converter blowing to promote the rapid slag formation of the slag-forming material to carry out the slag-gold reaction. The use of exothermic agents is an important auxiliary means to rapidly increase the temperature of the converter. The production method is generally based on exothermic substances as the main raw materials...

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 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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