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Pellet-reducing dephosphorizing method for high-phosphorus ore

A high-phosphorus ore and pellet technology, applied in the field of ironmaking, can solve problems such as difficult and impossible dephosphorization, and achieve effective dephosphorization

Inactive Publication Date: 2017-05-31
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method of gas-based reduction-grinding magnetic separation-melting dephosphorization to solve the problem that it is difficult to remove phosphorus in the beneficiation process of high phosphorus ore, and the problem that blast furnace smelting cannot dephosphorize

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  • Pellet-reducing dephosphorizing method for high-phosphorus ore

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Experimental program
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Effect test

Embodiment 1

[0034] In this embodiment, oolitic high-phosphorus hematite is selected, the mass content of iron is 47.82%, and the content of phosphorus is 0.93 wt%. The oolitic high-phosphorus hematite was made into pellets and reduced under a reducing gas atmosphere at a temperature of 900°C. Among them, H 2 The volume of CO and CO accounted for 90% of the total volume of reducing gas, H 2 : CO = 2: 1, the reduction time was 4 hours, and the metallized pellets with a metallization rate of 90.94% were obtained.

[0035] The metallized pellets are finely ground on a ball mill, and the mass of the obtained metal particles with a particle diameter of ≤74 μm accounts for 93% of the total mass of the metal particles. Put the metal particles on a magnetic separator with a magnetic field strength of 1800Oe, the mass content of iron in the obtained recovered iron powder is 81%, and the recovery rate of metallic iron is 92%.

[0036] Add 3.5wt% CaO and 8wt% CaCl to recycled iron powder 2 As a f...

Embodiment 2

[0038] In this embodiment, oolitic high-phosphorus hematite is selected, the mass content of iron is 46.12%, and the content of phosphorus is 0.98 wt%. The oolitic high-phosphorus hematite was made into pellets and reduced under a reducing gas atmosphere at a temperature of 1000°C. Among them, H 2 The volume of CO and CO accounted for 95% of the total volume of reducing gas, H 2 : CO=2.5:1, the reduction time was 4.5h, and the metallized pellets with a metallization rate of 90.1% were obtained.

[0039] The metallized pellets are finely ground on a ball mill, and the mass of the obtained metal particles with a particle diameter of ≤74 μm accounts for 90% of the total mass of the metal particles. Put the metal particles on a magnetic separator with a magnetic field strength of 1800Oe, the mass content of iron in the obtained recovered iron powder is 82%, and the recovery rate of metallic iron is 91%.

[0040] Add 5wt% CaO and 10wt% CaCl to recycled iron powder 2 As a flux a...

Embodiment 3

[0042] In this embodiment, oolitic high-phosphorus hematite is selected, the mass content of iron is 43.85%, and the content of phosphorus is 0.67 wt%. The oolitic high-phosphorus hematite was made into pellets and reduced under a reducing gas atmosphere at a temperature of 900°C. Among them, H 2 The volume of CO and CO accounted for 90% of the total volume of reducing gas, H 2 : CO = 2: 1, the reduction time is 4 hours, and the metallized pellets with a metallization rate of 90.20% are obtained.

[0043] The metallized pellets are finely ground on a ball mill, and the mass of the obtained metal particles with a particle diameter of ≤74 μm accounts for 86% of the total mass of the metal particles. Put the metal particles on a magnetic separator with a magnetic field strength of 1800Oe, the mass content of iron in the obtained recovered iron powder is 81%, and the recovery rate of metallic iron is 91%.

[0044] Add 3wt% CaO and 5wt% CaCl to recycled iron powder 2 As a flux ...

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Abstract

The invention relates to a pellet-reducing dephosphorizing method for high-phosphorus ore. The method comprises the steps that the high-phosphorus ore is subjected to grinding, pelletizing and gas-based reduction treatment, metalized pellets are obtained, and no carbon is added in the pelletizing process; the metalized pellets are subjected to ore grinding and magnetic separation, recycling iron powder and slag are obtained; fluxing agents and dephosphorization agents are added into the recycling iron powder to obtain a mixed material, wherein the mass of the dephosphorization agents accounts for 5-10% of the total mass of the mixed material; and after the mixed material is subjected to melt separation reaction, metal iron and tailings are obtained. By means of the method, phosphorus in the high-phosphorus ore is removed finally and is mainly enriched in the tailings, the content of the phosphorus in the obtained metal iron is low, and effective dephosphorizing of the high-phosphorus ore can be achieved.

Description

technical field [0001] The invention relates to the technical field of ironmaking, in particular to a method for dephosphorizing high phosphorus ore reduction pellets. 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 effectively utilized because it is extremely difficult to remove phosphorus during the beneficiation process, and the blast furnace smelting process cannot dephosphorize. When phosphorus enters the metal, "cold quenching" will occur, which will seriously affect the quality of pig iron and steel. Therefore, the phosphorus content of the incoming raw materials is required to be less than 0.2wt%. [0003] The dephosphorization and smelting of high phosphorus ore adopts the gas-based redu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/11C21C7/064
CPCC22B1/11C21C7/064
Inventor 边妙莲陈士朝孙辉马冬阳吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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