Hot metal pretreatment dephosphorization agent and preparation method thereof

A technology of molten iron pretreatment and dephosphorization agent, applied in the field of iron and steel metallurgy, can solve the problems of serious erosion of refractory materials, adverse effects on steel hardenability, adverse environmental effects, etc., achieves good fluidity, good economic and social benefits, avoids The effect of F on the pollution of the environment

Inactive Publication Date: 2017-11-28
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] ①The initial slagging speed is slow;
[0005] ②The cost of dephosphorization agent is high;
[0006] ③The dephosphorization agent contains 5-20% CaF 2 , seriously erodes refractory materials, and the fluoride in dephosphorization slag pollutes the soil, which is not conducive to environmental protection
The disadvantage of this dephosphorization agent is that the dephosphorization agent contains CaF 2 , will adversely affect the environment
The d

Method used

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  • Hot metal pretreatment dephosphorization agent and preparation method thereof
  • Hot metal pretreatment dephosphorization agent and preparation method thereof
  • Hot metal pretreatment dephosphorization agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0027] The composition of the electrostatic precipitator ash of the sintering head is shown in Table 1.

[0028] Table 1 Composition of ESP dust in sintering head (wt,%)

[0029]

[0030] The ingredient scheme of dephosphorization agent is shown in Table 2, and the composition of conventional dephosphorization agent is shown in Table 3.

[0031] Table 2 Dephosphorization agent batching scheme of the present invention (wt,%)

[0032]

[0033] Table 3 Composition scheme of conventional calcium-based dephosphorization agent (wt,%)

[0034]

[0035] After the above-mentioned dephosphorization agent is dried, it is ground to a thickness of less than 1 mm, and mixed evenly. Then, in a 200kg induction furnace, 100kg molten iron was charged, and 3kg dephosphorization agent was sprayed into the molten iron at 1350° C.

[0036] Table 4: Comparison of dephosphorization effects (%)

[0037]

example 2

[0039] The ash composition of sintering head ESP is shown in Table 5.

[0040] Table 5 Composition of ESP dust in sintering head (wt,%)

[0041]

[0042] The ingredient scheme of dephosphorization agent is shown in Table 6, and the composition of conventional dephosphorization agent is shown in Table 7.

[0043] Table 6 Dephosphorization agent batching scheme of the present invention (wt,%)

[0044]

[0045] Table 7 Composition scheme of conventional calcium-based dephosphorization agent (wt,%)

[0046]

[0047] After the above-mentioned dephosphorization agent is dried, it is ground to a thickness of less than 1 mm, and mixed evenly. Then, in a 200 kg induction furnace, 100 kg of molten iron was charged, and 3 kg of dephosphorization agent was sprayed into the molten iron at 1350° C.

[0048] Table 8: Comparison of dephosphorization effects (%)

[0049]

example 3

[0051] The composition of the electrostatic precipitator ash of the sintering head is shown in Table 9.

[0052]Table 9 Composition of ESP dust in sintering head (wt,%)

[0053]

[0054] The ingredient scheme of dephosphorization agent is shown in Table 10, and the composition of conventional dephosphorization agent is shown in Table 11.

[0055] Table 10 Dephosphorization agent batching scheme of the present invention (wt,%)

[0056]

[0057] Table 11 Conventional calcium-based dephosphorization agent ingredient scheme (wt,%)

[0058]

[0059] After the above-mentioned dephosphorization agent is dried, it is ground to a thickness of less than 1 mm, and mixed evenly. Then, in a 200kg induction furnace, 100kg of molten iron was charged, and 3kg of dephosphorization agent was sprayed into the molten iron at 1350°C. The dephosphorization effects of the molten iron dephosphorization agent in Example 3 of the present invention and conventional dephosphorization agents ar...

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Abstract

The invention discloses a hot metal pretreatment dephosphorization agent and a preparation method thereof. In mass percent, a formula of the dephosphorization agent comprises: 30-70% of drying sintering nose electric precipitation ash, 10-30% of lime CaCO3 and 10-40% of iron oxide; binary basicity CaO/SiO2 of the hot metal pretreatment dephosphorization agent is 3-4, and alkali chloride content is 5-15%; in mass percent, the total content of four substances, namely CaO, Fe, KCl and NaCl, in the dry sintering nose electric precipitation ash is not less than 60%, wherein the content of alkali chlorides is not less than 10%; and the iron oxide is one or more of sintered ore, iron ore powder, converter dust, electric furnace dust and oxidized scale. Ingredients of the formula of the dephosphorization agent are dried and treated and then are ground until particle size is below 1mm, and uniform mixing is carried out.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, in particular to a molten iron pretreatment dephosphorization agent and a preparation method thereof. Background technique [0002] Iron and steel metallurgical sintering head electric dust is the flue gas and dust collected by the electric dust collector during the iron ore sintering process, and its production volume accounts for about 2%-4% of the sinter output. A joint enterprise with an annual output of 10 million tons of steel produces about 300,000 tons of electrostatic precipitator ash for sintering heads per year. Iron ore raw materials often contain impurity elements such as potassium, sodium, and fluorine, and the resulting sintering dust contains high potassium and sodium content. The sintered ash is directly returned to the blast furnace for recycling, which will lead to the gradual enrichment of elements such as potassium and sodium in it. It may lead to corrosio...

Claims

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Application Information

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IPC IPC(8): C21C1/02
CPCC21C1/025
Inventor 姜喆车玉满郭天永孙鹏姚硕田景长王舜于文涛胡攀马继峰
Owner ANGANG STEEL CO LTD
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