Method for preparing free cutting steels and slag phosphate fertilizers using phosphorus-rich sulfur-rich iron powder

Abstract

The invention belongs to the field of ferrous metallurgy, and particularly relates to a method for preparing free cutting steels and steel slag phosphate fertilizers using phosphorus-rich sulfur-rich iron powder. According to the method disclosed by the invention, a special slagging agent is prepared based on fully utilization of the oxide impurities in the iron powder; a melting separation technique is adopted, so that the migration of phosphorus from an iron phase to a slag phase is realized, and sulfur is reserved in the iron phase; dephosphorization is performed through a double slag process, so that molten steel and slags rich in phosphorus, which conform to the requirements of the free cutting steels are obtained at the same time; the slags rich in phosphorus can be directly used as the steel slag phosphate fertilizers after being separated magnetically, and finally the comprehensive utilization of the phosphorus-rich sulfur-rich iron powder is realized.

Description

technical field

[0001] The invention belongs to the field of iron and steel metallurgy, and in particular relates to a method for preparing free-cutting steel and steel slag phosphate fertilizer from high-phosphorus and high-sulfur iron powder. Background technique

[0002] Among the complex and refractory iron ores in my country, the high-phosphorus oolitic hematite reserves are the largest, with proven reserves of 3.72 billion tons and predicted prospective reserves of more than 10 billion tons. Because this type of ore has the characteristics of complex ore structure, fine particle size of useful minerals, and high phosphorus content of harmful impurities, traditional separation processes such as magnetic separation, gravity separation, flotation, and magnetization roasting and their combined processes are used to treat high-phosphorus oolitic Hematite, obtained iron concentrate in the presence of phosphorus and Al 2 o 3 Due to the problem that the content exceeds the s...

Examples

Embodiment 1

[0027] The high phosphorus and high sulfur iron powder used in this embodiment contains MFe84.17%, P1.74%, S0.22%, C0.19%, SiO 2 2.15%, Al 2 o 3 1.21%, FeO10.32%, adopt its method for preparing free-cutting steel and steel slag phosphate fertilizer to carry out according to the following steps:

[0028] (1) Mix the high-phosphorus and high-sulfur iron powder with the primary dephosphorization slagging agent. The primary dephosphorization slagging agent consists of 60% CaO and 40% Fe 2 o 3 Composition, the amount of primary dephosphorization slagging agent accounted for 13% of the weight of iron powder, mixed evenly and put into the reaction tank, at room temperature, put the reaction tank into the reaction furnace, control the temperature of the reaction furnace to 1590 ° C, Insulate for 11 minutes to perform a dephosphorization, and get molten iron and a dephosphorization slag after removing the slag;

[0029] (2) Add the secondary dephosphorization slagging agent to the ...

Embodiment 2

[0032] Contain MFe84.92%, P1.79%, S0.25%, C0.24%, SiO in the high phosphorus high sulfur iron powder in the present embodiment by weight percentage 2 2.01%, Al 2 o 3 1.32%, FeO9.47%, adopt its method for preparing free-cutting steel and steel slag phosphate fertilizer to carry out according to the following steps:

[0033] (1) Mix the high-phosphorus and high-sulfur iron powder with the primary dephosphorization slagging agent. The primary dephosphorization slagging agent consists of 70% CaO and 30% Fe 2 o 3 Composition, the amount of primary dephosphorization slagging agent accounted for 12% of the weight of iron powder, mixed evenly and put into the reaction tank, at room temperature, put the reaction tank into the reaction furnace, control the temperature of the reaction furnace to 1580 ° C, Insulate for 12 minutes to perform a dephosphorization, and get molten iron and a dephosphorization slag after removing the slag;

[0034] (2) Add a secondary dephosphorization slag...

Embodiment 3

[0037] Contain MFe84.92%, P1.79%, S0.25%, C0.24%, SiO in the high phosphorus high sulfur iron powder in the present embodiment by weight percentage 2 2.01%, Al 2 o 3 1.32%, FeO9.47%, adopt its method for preparing free-cutting steel and steel slag phosphate fertilizer to carry out according to the following steps:

[0038] (1) Mix the high-phosphorus and high-sulfur iron powder with the primary dephosphorization slagging agent. The primary dephosphorization slagging agent consists of 65% CaO and 35% Fe 2 o 3 Composition, the amount of primary dephosphorization slagging agent accounted for 14% of the weight of iron powder, mixed evenly and put into the reaction tank, at room temperature, put the reaction tank into the reaction furnace, control the temperature of the reaction furnace to 1600 ° C, Insulate for 10 minutes to perform a dephosphorization, and get molten iron and a dephosphorization slag after removing the slag;

[0039] (2) Add a secondary dephosphorization slag...

technical field

[0001] The invention belongs to the field of iron and steel metallurgy, and in particular relates to a method for preparing free-cutting steel and steel slag phosphate fertilizer from high-phosphorus and high-sulfur iron powder. Background technique

[0002] Among the complex and refractory iron ores in my country, the high-phosphorus oolitic hematite reserves are the largest, with proven reserves of 3.72 billion tons and predicted prospective reserves of more than 10 billion tons. Because this type of ore has the characteristics of complex ore structure, fine particle size of useful minerals, and high phosphorus content of harmful impurities, traditional separation processes such as magnetic separation, gravity separation, flotation, and magnetization roasting and their combined processes are used to treat high-phosphorus oolitic Hematite, obtained iron concentrate in the presence of phosphorus and Al 2 o 3 Due to the problem that the content exceeds the s...

Examples

Embodiment 1

[0027] The high phosphorus and high sulfur iron powder used in this embodiment contains MFe84.17%, P1.74%, S0.22%, C0.19%, SiO 2 2.15%, Al 2 o 3 1.21%, FeO10.32%, adopt its method for preparing free-cutting steel and steel slag phosphate fertilizer to carry out according to the following steps:

[0028] (1) Mix the high-phosphorus and high-sulfur iron powder with the primary dephosphorization slagging agent. The primary dephosphorization slagging agent consists of 60% CaO and 40% Fe 2 o 3 Composition, the amount of primary dephosphorization slagging agent accounted for 13% of the weight of iron powder, mixed evenly and put into the reaction tank, at room temperature, put the reaction tank into the reaction furnace, control the temperature of the reaction furnace to 1590 ° C, Insulate for 11 minutes to perform a dephosphorization, and get molten iron and a dephosphorization slag after removing the slag;

[0029] (2) Add the secondary dephosphorization slagging agent to the ...

Embodiment 2

[0032] Contain MFe84.92%, P1.79%, S0.25%, C0.24%, SiO in the high phosphorus high sulfur iron powder in the present embodiment by weight percentage 2 2.01%, Al 2 o 3 1.32%, FeO9.47%, adopt its method for preparing free-cutting steel and steel slag phosphate fertilizer to carry out according to the following steps:

[0033] (1) Mix the high-phosphorus and high-sulfur iron powder with the primary dephosphorization slagging agent. The primary dephosphorization slagging agent consists of 70% CaO and 30% Fe 2 o 3 Composition, the amount of primary dephosphorization slagging agent accounted for 12% of the weight of iron powder, mixed evenly and put into the reaction tank, at room temperature, put the reaction tank into the reaction furnace, control the temperature of the reaction furnace to 1580 ° C, Insulate for 12 minutes to perform a dephosphorization, and get molten iron and a dephosphorization slag after removing the slag;

[0034] (2) Add a secondary dephosphorization slag...

Embodiment 3

[0037] Contain MFe84.92%, P1.79%, S0.25%, C0.24%, SiO in the high phosphorus high sulfur iron powder in the present embodiment by weight percentage 2 2.01%, Al 2 o 3 1.32%, FeO9.47%, adopt its method for preparing free-cutting steel and steel slag phosphate fertilizer to carry out according to the following steps:

[0038] (1) Mix the high-phosphorus and high-sulfur iron powder with the primary dephosphorization slagging agent. The primary dephosphorization slagging agent consists of 65% CaO and 35% Fe 2 o 3 Composition, the amount of primary dephosphorization slagging agent accounted for 14% of the weight of iron powder, mixed evenly and put into the reaction tank, at room temperature, put the reaction tank into the reaction furnace, control the temperature of the reaction furnace to 1600 ° C, Insulate for 10 minutes to perform a dephosphorization, and get molten iron and a dephosphorization slag after removing the slag;

[0039] (2) Add a secondary dephosphorization slag...

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