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Low magnesium type molten iron/semisteel desulfurizing agent and preparation method thereof

The technology of desulfurization agent and molten iron is applied in the field of metallurgical auxiliary materials, which can solve the problems of reducing desulfurization efficiency, difficult to meet the production needs of low-sulfur steel, and low desulfurization effect of desulfurization agent, and achieves reduction of iron loss of molten iron desulfurization, low comprehensive cost of desulfurization, and low desulfurization effect. The effect of short molten iron desulfurization time

Inactive Publication Date: 2010-09-08
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the desulfurizer contains Al, and after adding Al, the desulfurization efficiency of other active ingredients in the desulfurizer is reduced
In addition, the desulfurization effect of the desulfurizer is not high, and it is difficult to meet the production needs of low-sulfur steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0010] The preparation method of the low-magnesium type molten iron / semi-steel desulfurizer of the present invention comprises the following steps: crushing, finely grinding and then mixing each raw material to obtain the low-magnesium type molten iron / semi-steel desulfurizer with a particle size of ≤0.125mm. Here, each raw material may be crushed separately, or mixed and crushed.

[0011] Further, in order to prolong the shelf life of the desulfurizer, and to make the production and use more smooth and the loading easier, a passivator of 0.8-1.5 wt% of the total weight of the finely ground raw materials is added when the above raw materials are finely ground. Wherein, the passivating agent is silicone oil or the like.

Embodiment 1

[0013] Embodiment 1 Preparation of desulfurizer of the present invention

[0014] After crushing 19kg of calcium carbide, 13kg of sodium carbonate, 57.8kg of quicklime and 2.5kg of fluorite, they are sent into the abrasive device together with 2.2kg of graphite, and finely ground to a size below 0.125mm to obtain a fine abrasive. Then the fine abrasive is sent to the agitator, and 5.5 kg of passivated magnesium powder is added, and after mixing, the low-magnesium type molten iron / semi-steel desulfurizer of the present invention is obtained, which is sent to the storage bin for storage, and is protected by nitrogen gas. After determination, the composition of the prepared desulfurizer is: CaC 2 15%, Na 2 CO 3 8%, CaO 75%, CaF 2 2%, C 2%, Mg 5%, impurity 3%, impurity is SiO 2 , S, FeO, MgO, etc., the sum of the weight of the above components is 100%.

Embodiment 2

[0015] Embodiment 2 Preparation of desulfurizer of the present invention

[0016] After crushing 38kg of calcium carbide, 5kg of sodium carbonate, 43.4kg of quicklime and 6.2kg of fluorite, they are sent into the abrasive device together with 5.2kg of graphite, and finely ground to less than 0.125mm to obtain fine abrasive. Then the fine abrasive is sent to the agitator, and 2.2kg of passivated magnesium powder is added, after mixing, the low-magnesium type molten iron / semi-steel desulfurizer of the present invention is obtained, which is sent to the storage bin for storage, and is protected by nitrogen gas. After determination, the composition of the prepared desulfurizer is: CaC 2 30%, Na 2 CO 3 3%, CaO 50%, CaF 2 5%, C 5%, Mg 2%, impurity 3%, impurity is SiO 2 , S, FeO, MgO, etc., the sum of the weight of the above components is 100%.

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Abstract

The invention relates to a low magnesium type molten iron / semisteel desulfurizing agent and a preparation method thereof, belonging to the metallurgy auxiliary materials field. The low magnesium type molten iron / semisteel desulfurizing agent has good desulfurizing effect and is prepared from following raw materials by weight: 15-30 parts of CaC2, 3-8 parts of Na2CO3, 50-75 parts of CaO, 2-5 partsof CaF2, 2-5 parts of C, 2-5 parts of Mg, and the balance of inevitable impurities. The low magnesium type molten iron / semisteel desulfurizing agent provides good ensurance for the low-sulphur steel,improves the slag state in the molten iron desulphurization process, greatly decreases the molten iron desulphurization iron loss and has the advantages of short molten iron desulphurization time, small slag quantity, low temperature drop, low desulphurization integrated cost, good desulphurization effect and wide applications prospects.

Description

technical field [0001] The invention relates to a low-magnesium type molten iron / semi-steel desulfurizer and a preparation method thereof, belonging to the field of metallurgical auxiliary materials. Background technique [0002] Excessive sulfur content in steel will reduce the plasticity and toughness of steel, thus affecting the quality of steel. The sulfur content of molten iron obtained from iron ore smelting is generally high, so desulfurization treatment is required. Currently widely used desulfurizers are mainly composed of quicklime, calcium carbide, and metal magnesium as the main agent, and then other auxiliary agents are added to prepare composite desulfurizers. [0003] Such as: CN101358265, the patent application titled "composite hot metal desulfurizer and its preparation method" (publication date: 2009.02) discloses a kind of composite hot metal desulfurizer, its composition and weight percentage are: CaO 70.0%~75.0 %, TMg 2.0% ~ 3.0%, CaC 2 10.0%~12.0%, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/064C21C1/02
Inventor 戈文荪卓钧何为陈永谢永中李桂军李清春肖明富蒋国兴蒋龙奎叶翔飞王建
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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