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Method for preparing steel smelting furnace materials from phosphorus-containing globulitic hematite

A technology of oolitic hematite and steelmaking furnace, which is applied in the field of utilization of phosphorus-containing oolitic hematite, can solve the problems of difficulty in phosphorus content in iron concentrate, poor dephosphorization effect, and large environmental pollution, and achieve metallization The effect of increasing the yield, improving the iron recovery rate, and reducing the content of harmful impurities

Active Publication Date: 2010-04-14
CENT SOUTH UNIV
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Problems solved by technology

[0013] In summary, due to the unique oolitic structure in high-phosphorus oolitic hematite and the complex intercalation relationship between phosphorus-containing gangue minerals and iron minerals, conventional mineral processing methods such as gravity separation, magnetic separation, and flotation are directly When processing oolitic hematite, although iron concentrate with a certain iron grade can be obtained, it is very difficult to effectively reduce the phosphorus content in the iron concentrate. When using phosphorus, there are also problems such as poor dephosphorization effect, poor product quality, low iron recovery rate, high cost, and large environmental pollution.

Method used

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  • Method for preparing steel smelting furnace materials from phosphorus-containing globulitic hematite
  • Method for preparing steel smelting furnace materials from phosphorus-containing globulitic hematite

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Embodiment 1

[0023] Embodiment 1: see figure 1, adding sodium huminate accounting for 8% of oolitic hematite mass percent, 1% of borax accounting for oolitic hematite mass percent, and 0.5% of oolitic hematite mass percent, accounting for oolitic hematite mass percent Sodium fulvic acid with a mass percentage of 1% of iron ore is pre-crushed and ground to less than 0.074mm in oolitic hematite with a mass percentage of 60%, mixed evenly, pelletized, dried, and then reduced and roasted with lignite, roasted The temperature is 1050°C, the roasting time is 1.5h, and the iron metallization rate reaches 96.2%. After cooling, the reduced pellets are crushed and ground to a mass percentage of less than 0.074mm, accounting for 80% of the mass percentage. Magnetic separation is carried out under a magnetic field of 0.1T. The iron grade of 93.84%, phosphorus content of 0.078%, Na 2 The metal iron powder product with O content of 0.18% has an iron recovery rate of 95.67% and a phosphorus removal rate...

Embodiment 2

[0024] Example 2: see figure 1 , adding sodium huminate accounting for 5% of oolitic hematite mass percentage, borax accounting for 2% of oolitic hematite mass percentage, and 1.0% of oolitic hematite mass percentage, accounting for oolitic hematite mass percentage Sodium fulvic acid with a mass percentage of 0.5% of iron ore is pre-crushed and ground to less than 0.074mm in oolitic hematite with a mass percentage of 50%, mixed evenly, pressed into agglomerates, dried and then reduced and roasted with lignite, roasted The temperature is 1000°C, the roasting time is 2 hours, and the metallization rate of iron reaches 93.6%. After cooling, the reduced pellets are crushed and ground to a mass percentage of less than 0.074mm, accounting for 90% of the mass percentage, and are separated by magnetic separation under a magnetic field of 0.12T. Obtain iron grade 92.47%, phosphorus content 0.083%, Na 2 The metal iron powder product with O content of 0.23% has an iron recovery rate of ...

Embodiment 3

[0025] Embodiment 3: see figure 1 , adding sodium huminate accounting for 7% of oolitic hematite mass percentage, 1.5% of borax accounting for oolitic hematite mass percentage, 0.75% of oolitic hematite mass percentage, accounting for oolitic hematite mass percentage Sodium fulvic acid with a mass percentage of 0.75% of iron ore is crushed to less than 0.074mm in oolitic hematite with a mass percentage of 60%, mixed evenly, pelletized, dried and then reduced and roasted with lignite at a roasting temperature of 1050°C , the roasting time is 2h, the metallization rate reaches 97.6%; the reduced pellets after cooling are crushed and ground to less than 0.074mm, accounting for 90% by mass, and the iron grade is 94.19% obtained by magnetic separation under a magnetic field of 0.1T , phosphorus content 0.08%, Na 2 The metal iron powder product with O content of 0.20% has an iron recovery rate of 93.94% and a phosphorus removal rate of 95.94%.

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Abstract

The invention discloses a method for preparing steel smelting furnace materials from a phosphorus-containing globulitic hematite. The method comprises the following steps: adding adhesives with certain proportion into a globulitic hematite which is broken and grinded to the granularity smaller than 0.074mm and has the mass percentage of 50% to 60%, mixing evenly, then, agglomerating, reducing and sintering dried blocks with coal as reducing agent with the sintering temperature of 1000 to 1050DEGC and with the time of 2 to 1.5h, breaking and grinding cooled reduced blocks to smaller than 0.074mm with the mass percentage of 80% to 90%, magnetically selecting and separating the blocks with the magnetic field intensity of 0.1 to 0.12T, and obtaining the metal iron powder, wherein the adhesive is mixed by sodium sulfate powder, solubor, natrium humate and sodium xanthonate, the mass percentage of sodium sulfate powder in the hematite is 5% to 8%, the mass percentage of solubor in the globulitic hematite is 1% to 2%, the mass percentage of natrium humate in the globulitic hematite is 0.5 % to 1%, and the mass percentage of sodium xanthonate in the globulitic hematite is 0.5 % to 1%. The method has high utilization efficiency, excellent dephosphorization effect, excellent product quality, high iron recovery rate, low cost and low environment pollution.

Description

technical field [0001] The invention relates to a method for utilizing phosphorus-containing oolitic hematite, in particular to a method for preparing steelmaking charge from phosphorus-containing oolitic hematite. Background technique [0002] With the rapid development of my country's iron and steel industry, high-grade and easy-to-smelt iron ore resources are decreasing day by day, and the development and comprehensive utilization of low-grade and complex and refractory iron ore resources are becoming more and more urgent. Phosphorus-containing oolitic hematite is an extremely difficult iron ore resource. According to statistics, there are about 3 to 5 billion tons of reserves in my country, mainly distributed in Hunan, Hubei, Guangxi, Guizhou and other regions. This kind of iron ore contains high phosphorus (0.4%~1.8%) and low iron grade (35%~50%). Mud and rock are mixed together to form a concentric layered oolitic structure; iron oxide grains in the ore are fine in si...

Claims

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Application Information

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IPC IPC(8): C22B1/02B22F9/04
Inventor 李光辉张元波姜涛李骞谢朝明唐兆坤范晓慧郭宇峰杨永斌吴光亮陈许玲许斌白国华黄柱成袁礼顺曾精华孙娜杨林
Owner CENT SOUTH UNIV
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