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Aluminium-calcium composite desulfurizing agent, and producing method and using method thereof

A production method and desulfurization agent technology are applied in the field of desulfurization treatment of molten iron, which can solve the problems of poor desulfurization slag state, high cost of desulfurization agent, and difficulty in separation of slag and iron, so as to achieve large slag-iron interfacial tension, improve desulfurization effect, and improve thermodynamics. the effect of the condition

Inactive Publication Date: 2003-03-26
JINGCHENG ZHIYUAN SCI & TECH DEV BEIJING
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Problems solved by technology

[0003] In the prior art, the desulfurizers used are CaO, CaF 2 , the disadvantage of this desulfurizer is that the desulfurization efficiency is low, the unit consumption of desulfurization is large, up to 10-12kg / t molten iron, and the temperature drop of molten iron is large
In addition, metal Mg is also used as a desulfurizer, but the cost of the desulfurizer is high, the state of the desulfurization slag is poor, and the separation of slag and iron is difficult; a slag polymer, such as kcaO, is required to increase the cost

Method used

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Embodiment Construction

[0029] According to the chemical composition range of the aluminum-calcium composite desulfurizer of the present invention, 3 batches of aluminum-calcium composite desulfurizers have been prepared. In the batching, the CaO raw material adopts lime, Al 2 o 3 The raw material is Al 2 o 3 ≥70% high alumina clinker, C uses flake graphite. After the above raw materials are crushed, ground and mixed, they are activated, and the processing parameters are shown in Table 2. After the activation treatment, the prepared additives and lubricants are added and fully mixed evenly to become the aluminum-calcium composite desulfurizer of the present invention. The chemical compositions of the three batches of Al-Ca composite desulfurizers are shown in Table 1.

[0030] The aluminum-calcium composite desulfurizer of batch No. 1 prepared above is smelted in the molten iron of 100kg induction furnace, utilizes injection desulfurization device, with N 2 The desulfurization test was carried o...

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Abstract

The invention mainly refers to iron-melt desulfurizing process. The compents of aluminium and calcium complexing desulfurizer (wt%): CaO 40-75%; Al2O3 5-30%, C 1-8%; Al 2-15%; chloride salt 1-10%; additive 1-5%, lubricant 1-5%; SiO2 <=10%; MgO<=10%. The producing method includes: charging breaking, grinding, mixing and activatino process, and the required particular degree after grinded in 80-100 mesh. The activation-process parameter; processing temperature 300-500 deg.C, time 20-60 minutes. Add additive and lubricant into mixed material after activation process, and evenly mix them to make the desulfurizer.

Description

technical field [0001] The invention belongs to the refining field of pig iron, and mainly relates to the desulfurization treatment of molten iron. Background technique [0002] Reducing the content of [P] and [S] in steel, eliminating the "hot embrittlement" of steel, and improving the quality of steel are the current development requirements and trends of iron and steel metallurgy. In converter steelmaking, according to the requirements of the current iron and steel metallurgical process development, on the one hand, the sulfur requirements for steel products are becoming increasingly stringent; on the other hand, it is required to reduce the desulfurization pressure of the converter. For this reason, hot metal desulfurization has become a concern of people. In addition, how to solve the thermodynamic conditions of the desulfurization reaction interface and the separation of slag and iron after the desulfurization reaction have become one of the important factors affectin...

Claims

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Application Information

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IPC IPC(8): C21C1/02C21C7/064
Inventor 李杰张杰
Owner JINGCHENG ZHIYUAN SCI & TECH DEV BEIJING
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