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A kind of steelmaking method of non-oriented silicon steel

A technology of oriented silicon steel and vacuum refining, which is applied in the direction of improving process efficiency to achieve the effects of reducing processing costs, saving consumption and reducing steelmaking costs.

Active Publication Date: 2021-06-29
INST OF RES OF IRON & STEEL JIANGSU PROVINCE +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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  • A kind of steelmaking method of non-oriented silicon steel

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Embodiment 1

[0029] The target composition of smelting non-oriented silicon steel is: C≤0.005%, Si: 1.6%, Al: 0.30%, Mn: 0.25%, P: 0.04%, S≤0.005%, Sn: 0.025%, and the balance is Fe and unavoidable impurity elements.

[0030] The technological process is tin mud powder making-hot metal desulfurization-180 tons converter steelmaking-RH vacuum refining-continuous casting, the specific process is as follows:

[0031](1) Dry electroplating tin mud to make tin mud powder: take the electroplating tin mud out of the tin mud filter of the electroplating production line and then dry it. The drying temperature is 350-400°C, and the drying time is ≥60min; the obtained tin mud The powder composition is: C: 1.52%, S: 0.51%, SiO 2 : 0.0068%, SnO 2 : 95.82%, Fe 2 o 3 : 2.09%, P 2 o 5 : 0.046%;

[0032] (2) Desulfurization pretreatment of molten iron: Calculated on the basis of 180 tons of molten steel and a target composition of Sn of 0.025%, 45kg of metal tin is required. The atomic weight of ti...

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Abstract

The invention discloses a steelmaking method for non-oriented silicon steel, which comprises: drying the waste electroplating tin sludge produced in an electroplating tin production line to make tin sludge powder; the molten iron desulfurization station uses tin sludge powder and desulfurizer to jointly spray and stir Desulfurization operation; after desulfurization of molten iron, the smelting of non-oriented silicon steel is completed through converter steelmaking-RH vacuum refining-continuous casting and other processes; the main component of tin sludge powder made from electroplating tin sludge is: C: 0% - 2% , S: 0%‑1.5%, SiO 2 : 0%‑0.2%, SnO 2 : 93%‑97%, Fe 2 O 3 : 0%‑3%, P 2 O 5 : 0%‑0.2%; the chemical composition of the finished non-oriented silicon steel containing Sn is: C≤0.005%, 0.4%≤Si≤3.5%, 0.2≤Mn≤2.0%, Al≤1.0%, P≤0.05%, S ≤0.005%, 0.01%≤Sn≤0.05%, the balance is Fe and unavoidable impurity elements. The invention utilizes electroplated tin sludge to dry to make tin sludge powder to smelt non-oriented silicon steel, reduces consumption of metal tin ingots, realizes recovery and effective utilization of electroplated tin sludge, reduces production cost, and reduces environmental pollution.

Description

technical field [0001] The invention relates to the technical field of non-oriented silicon steelmaking, in particular to a steelmaking method for smelting non-oriented silicon steel by using electroplating tin mud instead of pure tin ingots. Background technique [0002] Sn melting point: 231.89 ℃, boiling point: 2260 ℃, is a low melting point metal with silvery white metallic luster, pure tin is soft, good ductility at room temperature, stable chemical properties, not easy to be oxidized. Metal Sn has a wide range of uses. Usually, tin is plated on the surface of other products by electroplating process. During the production process of electroplating tin, the main component in the electroplating solution is Sn(OH) 4 If these foreign matters are not removed by filtration, they will adhere to the electroplated tin plate to form "tin dust" defects. Therefore, a filter system is installed on the electroplating tin line to filter the electroplating solution to obtain electrop...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/04C21C7/064C21C7/10C22C38/02C22C38/04C22C38/06
CPCC21C7/0645C21C7/10C22C33/04C22C38/002C22C38/004C22C38/008C22C38/02C22C38/04C22C38/06Y02P10/20
Inventor 张淑娟岳重祥李慧周彦召李化龙秦卫
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE