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Composite slagging agent for semi-steel making and preparation method thereof and semi-steel making method

A composite slagging agent and molten steel technology, applied in the field of semi-steel steelmaking, can solve the problems of large dosage and low Mn element content, achieve the effects of simple preparation method, increase Mn element content, and reduce steelmaking production costs

Inactive Publication Date: 2013-02-13
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

[0005] The purpose of the present invention is to overcome the defect that the composite slagging agent used in the semi-steel steelmaking process in the above-mentioned prior art is relatively large and the Mn element content in the final molten steel is low, and to provide a compound slagging agent with a relatively low dosage in the semi-steel steelmaking process. A compound slagging agent for semi-steel making that is small and effectively increases the content of Mn element in the end point molten steel, also provides a preparation method of the compound slagging agent, and also provides a method for using the compound slagging agent for semi-steel making method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0014] The preparation method of the composite slagging agent provided by the present invention comprises: crushing and grinding silicate-type manganese ore, iron oxide scale, quartz sand and binder until the particle size is below 1 mm, and mixing uniformly to obtain a mixture, and pressing the mixture into balls After the pellets are dried, they are roasted, preferably naturally dried, and the pellets are not easy to form cracks.

[0015] According to the preparation method of the composite slagging agent provided by the present invention, the above-mentioned equipment for grinding and mixing and equipment for pressing pellets can adopt various equipment known to those skilled in the art, for example, the grinding and mixing equipment can use crushers and ball mills; The equipment for pressing the pellets can adopt a symmetrical pellet press or a granulator.

[0016] According to the preparation method of the composite slagging agent provided by the present invention, prefer...

Embodiment 1

[0029] The main composition of iron oxide scale, silicate manganese ore, quartz sand and bentonite as binder are shown in Table 1.

[0030] Table 1

[0031]

name

Fe 2 o 3

(weight%)

FeO

(weight%)

SiO 2

(weight%)

MnO

(weight%)

Iron oxide scale

30.47

62.71

3.74

Silicate type manganese ore

2.76

6.14

37.1

42.3

Quartz sand

97.1

Bentonite

61.25

[0032] 1. Preparation of composite slagging agent

[0033]Add the iron oxide scale, silicate manganese ore powder, quartz sand, and bentonite in the above Table 1 in a mass ratio of 10:50:35:5 into a roller sand mixer for grinding and mix and stir evenly, the resulting mixture The particle size is below 1.0mm. The mixture is then added to a symmetrical briquetting machine, under the condition that the pressure of the symmetric briquetting machine...

Embodiment 2

[0048] Add the iron oxide scale, silicate manganese ore powder, quartz sand, and bentonite in the above Table 1 in a mass ratio of 15:40:40:5 into a roller sand mixer for grinding and mix and stir evenly, the resulting mixture The particle size is below 1.0mm. The mixture is then added to a symmetrical briquetting machine, under the condition that the pressure of the symmetric briquetting machine is 15Mpa, the pellets with a diameter of 10-50mm are extruded, the pellets are naturally dried for 48 hours, and heated at a temperature of 250 Roasting under the condition of 1.0°C for 1.0 hour, a pellet-shaped composite slagging agent was obtained, and the water content of the composite slagging agent was 2% by weight.

[0049] The composition of the obtained composite slagging agent is detected by chemical analysis method, and the main component of the composite slagging agent is: Fe 2 o 3 5.83 wt%, FeO 13.6 wt%, MnO 17.22 wt%, SiO 2 59.42% by weight.

[0050] The drop strength...

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PUM

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Abstract

The invention provides a composite slagging agent for semi-steel making. The composite slagging agent contains iron oxide, MnO and SiO2, wherein the iron oxide is Fe2O3 and / or FeO. The invention also provides a preparation method for the composite slagging agent and a semi-steel making method. According to the composite slagging agent provided by the invention for semi-steel making, the preparation method is simple, the consumption of the composite slagging agent in the semi-steel making process is low, and the composite slagging agent can be used for slagging and dephosphorization in the semi-steel making so that the semi-steel making process is performed more smoothly; and meanwhile, the composite slagging agent can effectively improve the Mn element content of the final molten steel and correspondingly reduce the consumption of Mn-containing alloy added in a subsequent step of the steel making production so as to reduce the steel making production cost.

Description

technical field [0001] The invention relates to a compound slagging agent used in semi-steel making, and also relates to a preparation method of the compound slagging agent and a method of using the compound slagging agent in semi-steel making. Background technique [0002] Some iron and steel plants use vanadium-titanium magnetite for smelting. In order to ensure the effective utilization of resources, desulfurization and vanadium extraction processes are usually carried out before steelmaking. The mass percentage of carbon in semi-steel after desulfurization and vanadium extraction is 3.2-3.8%. , the mass percent content of phosphorus in the semi-steel is 0.06-0.08%, and the content of other heating elements such as silicon and manganese are trace amounts. Since the contents of silicon and manganese heating elements are trace amounts, there are problems such as insufficient heat source and slow slagging speed in the semi-steel steelmaking process. Therefore, in order to ef...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/076C22B1/248C21C5/36
CPCY02P10/20
Inventor 何为杨素波陈永李安林杨森祥李清春邱伟李利刚蒋龙奎翁建军
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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