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Method for separating metal iron from phosphorus containing iron ore

A technology for separating metal and iron ore, applied in the field of metallurgy, can solve the problems of low utilization rate of iron, low metallization rate, poor dephosphorization effect, etc., and achieve the effect of reducing energy consumption and processing cost, and improving dephosphorization rate

Active Publication Date: 2015-03-25
SHENWU TECH GRP CO LTD
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Problems solved by technology

However, under this condition, the metallization rate of the reduced high-phosphate ore is lower than 65%, and the iron utilization rate is very low. The temperature required for metallized iron powder in the slag-iron melting process is 1600 ° C, and the phosphorus in the iron after melting The content is as high as 0.33%, the dephosphorization effect is not good, and the phosphorus-containing molten iron must be dephosphorized twice to meet the limit requirements for phosphorus content in molten steel

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  • Method for separating metal iron from phosphorus containing iron ore

Examples

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Effect test

Embodiment 1

[0066] Phosphorus-containing iron ore: Hubei Heishi plate oolitic high-phosphorus hematite, in which the iron grade is 45.58wt%, and the phosphorus content is 0.9wt%;

[0067] Separation step: finely grind the high-phosphorus hematite to obtain ore powder, wherein particles with a particle size below 74 microns in the ore powder account for 55% by weight, and then the ore powder and limestone are separated according to a mass ratio of 1:0.035 After mixing, spray water in the pelletizer to obtain ore pellets, then dry the ore pellets, and then raise the dried ore pellets from room temperature at a rate of 14°C / min. to 1280°C, and keep the temperature at 1280°C for 10 minutes to obtain roasted pellets with a compressive strength higher than 2500N, and then at 800°C, place the roasted pellets in a shaft furnace in a mixed reducing atmosphere containing hydrogen and carbon monoxide (H 2 The total volume content of CO and CO is 90%, wherein H:C=4:1) to carry out gas-based reduction...

Embodiment 2

[0069]Phosphorus-containing iron ore: Ningxiang-style high-phosphorus oolitic hematite, in which the iron grade is 42.4% and the phosphorus content is 1.0%;

[0070] Separation step: finely grind the high-phosphorus oolitic hematite to obtain ore powder, wherein particles with a particle size below 74 microns in the ore powder account for 55% by weight, and then mix the ore powder and limestone at a mass ratio of 1:0.05 After mixing, spray water in the pelletizer to pelletize to obtain ore pellets (water content is 8wt%), then dry the ore pellets, and then dry the obtained ore pellets at 14°C / The heating rate of min was raised from room temperature to 1280°C, and the temperature was kept at 1280°C for 10 minutes to obtain roasted pellets with a compressive strength higher than 2500N, and then at 850°C, the roasted pellets were heated in a shaft furnace containing hydrogen and carbon monoxide mixed reducing atmosphere (H 2 The total volume content of CO and CO is 90%, wherein...

Embodiment 3

[0072] Phosphorus-containing iron ore: high-phosphorus oolitic hematite in western Hubei, wherein the iron grade is 39.3wt%, and the phosphorus content is 1.1wt%;

[0073] Separation step: finely grind the high-phosphorus oolitic hematite to obtain ore powder, wherein the particles with a particle size below 74 microns in the ore powder account for more than 60 wt%, and then mix the ore powder and limestone according to the mass ratio of 1: After mixing at 0.04, spray water in the pelletizer to pelletize to obtain ore pellets (water content is 8wt%), then dry the ore pellets, and then dry the obtained ore pellets at 14°C The heating rate was increased from room temperature to 1280°C / min, and kept at 1280°C for 10 minutes to obtain roasted pellets with a compressive strength higher than 2500N. Mixed reducing atmosphere of carbon monoxide (H 2 The total volume content of CO and CO is 90%, wherein H:C=3:1) to carry out gas-based reduction treatment for 3h, to obtain metallized p...

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Abstract

The invention discloses a method for separating metal iron from phosphorus containing iron ore. The method includes the following steps: (1) fine grinding the phosphorus containing iron ore to obtain iron ore powder; (2) pelletizing the iron ore powder to obtain iron ore pellets; (3) drying the iron ore pellets to obtain dried iron ore pellets; (4) roasting the dried iron ore pellets to obtain roasted iron ore pellets; (5) performing gas-based reduction on the roasted iron ore pellets in a shaft furnace at the temperature of 800-900 DEG C to obtain metallized pallets; (6) performing melt separation under the nitrogen atmosphere after the metallized pallets are mixed with a fluxing agent and a dephosphorization agent to obtain metal iron and phosphorus containing tailings. The method can be used for effectively separating phosphorus in phosphorus containing iron ore, so as to obtain the metal iron with the phosphorus content lower than 0.2 wt% after separation.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, in particular, the invention relates to a method for separating metallic iron from phosphorus-containing iron ore. Background technique [0002] With the rapid expansion of the global iron and steel industry, traditional high-quality iron ore resources are gradually exhausted, and the development and utilization of low-grade iron ore has become an urgent problem to be solved. Tens of billions of tons of high-phosphorus iron ore have not been widely used because it is extremely difficult to remove phosphorus in the beneficiation process, and the blast furnace smelting process cannot dephosphorize. Phosphorus enters the metal and "cold quenching" occurs, which seriously affects the quality of pig iron and steel. Therefore, the phosphorus content of the raw materials for the furnace is required to be less than 0.20%. [0003] At present, the main processes for dephosphorization of high-phosphate...

Claims

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Application Information

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IPC IPC(8): C21B13/02
Inventor 吴道洪边妙莲陈士朝
Owner SHENWU TECH GRP CO LTD
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