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

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 andsintering 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 adhesiveis 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%. Themethod 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...

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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.

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