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Process of using magnesia-calcium-carbon balls in LF steel making

A technology of carbon spheres and process, which is applied in the field of LF steelmaking process and magnesia-calcium carbon spheres, can solve the problems of high cost, achieve low cost, facilitate transportation and storage management, and reduce dependence

Active Publication Date: 2015-12-23
XINJIANG ZHONGHE DAZHENG COMMERCE & TRADE
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  • Application Information

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Problems solved by technology

According to these documents, it can be seen that the application of calcium carbide in steelmaking has high cost and many negative effects

Method used

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Embodiment Construction

[0016] The invention will be further described below in conjunction with the embodiment of producing 5 tons of dolomite carbon spheres. A kind of magnesia-calcium carbon ball is used in the technology of LF steelmaking, selects Xinjiang local dolomite (in which CaMg (CO 3 ) 2 content is 98%), the carbon content is: 98%×24 (atomic weight of magnesium) ÷ 167 (molecular weight of dolomite)=14%, the carbon content of local graphite powder is 90%;

[0017] 1) According to the previous calculation, purchase 2.04 tons of graphite powder and 2.96 tons of dolomite and transport them to the production area for use.

[0018] 2) Put the two kinds of raw materials into the crusher and crush them first, then grind them to less than 1mm in the middle of the Raymond mill, mix them evenly, add them to a high-pressure ball press machine, press them into balls, and then transport them to the LF refining furnace bit to be used.

[0019] When smelting aluminum-killed steel in the converter, the...

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PUM

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Abstract

The invention discloses a process of using magnesia-calcium-carbon balls in LF (ladle furnace) steel making. The process comprises the steps that dolomite and graphite carbon are uniformly mixed, then crushed, and pulverized till the particle size is below 1mm; the pulverized dolomite and graphite carbon are then put into a ball pressing machine to allow carbon, and calcium carbonate and magnesium carbonate that are in dolomite to be pressed together to form a homogeneous body of carbonate and carbon; and the homogeneous body is made into deoxidant carbon balls capable of replacing calcium carbide. Computational formulas of adding amounts of carbon and dolomite are as follows: (1) the content of carbon is controlled at 45%, the content of carbon in dolomite is assumed to be alpha, the content of carbon in graphite is assumed to beta, the adding amount of graphite is Q, then the computational formula of the adding amount (Q) of graphite is as follows: Q is equal to (45-100alpha) / (beta-alpha); and (2) the adding amount (G) of dolomite is controlled in accordance with 100-Q. When aluminium killed steel is smelted in a rotary furnace, according to the principle of replacing calcium carbide at the equal adding amount, the above deoxidant carbon balls are added, and are used according to the traditional steel melting process.

Description

technical field [0001] The invention relates to the application process of using magnesia-calcium carbon balls instead of calcium carbide in the refining process in the steelmaking process, in particular to a process for using magnesia-calcium carbon spheres in LF steelmaking. Background technique [0002] In the steelmaking process, the use of calcium carbide for steelmaking is mainly to use the calcium carbide in it to decompose, and the carbon in it reacts with the oxygen or oxide in the molten steel or steel slag to reduce the oxygen content in the molten steel or steel slag. While calcium carbide deoxidizes, the deoxidized products are CO and CaO. When deoxidizing molten steel, it does not pollute molten steel, and when deoxidizing steel slag, it does not reduce the alkalinity of steel slag. [0003] However, the calcium carbide used in steelmaking is prone to moisture and deterioration during transportation and storage, which will have a negative impact. In addition, c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/06
Inventor 吴汉元
Owner XINJIANG ZHONGHE DAZHENG COMMERCE & TRADE
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