Industrial production method for conducting iron increase and phosphorous reduction on high-phosphorus oolitic hematite

An oolitic hematite and high-phosphorus technology, applied in the field of metallurgy, can solve the problems of restricting the development and utilization of high-phosphorus oolitic hematite resources, difficult to realize large-scale application, economically unfeasible, etc., and achieve the goal of being suitable for large-scale industry Production, realization of large-scale industrial application, loose structure effect

Inactive Publication Date: 2016-06-22
WUHAN UNIV OF SCI & TECH
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Problems solved by technology

The reason is that the above recovery methods all have problems such as high energy consumption, low recovery rate, economic infeasibility and difficulty in large-scale application, which seriously restrict the development and utilization of high phosphorus oolitic hematite resources.

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  • Industrial production method for conducting iron increase and phosphorous reduction on high-phosphorus oolitic hematite

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Embodiment 2

[0033] The present embodiment is basically the same as embodiment 1, and the difference is that the chemical composition of high phosphorus oolitic hematite is mainly: Fe 2 o 3 38.03wt%, Al 2 o 310.87wt%, SiO 2 18.26wt%, CaO6.90wt%, P1.2wt%, mix high-phosphorus oolitic hematite, bentonite, dephosphorization agent and water, and use a briquetting machine to make green ore with a diameter of 8-15mm. The roasting temperature is 1000°C, and the roasting time is 30min; the proportion of CO in the mixed gas fed into the reduction section is 20%, the temperature of the mixed gas is 850°C, the CO content in the top gas is 7%, and the volume of the top gas is 86% % returns to the mixed gas tank, and 14% returns to the heat exchanger as fuel gas. The porosity of the reduced magnetite pellets is 40%, and the structure is loose; the grade of the iron concentrate after magnetic separation is 63%, the P content in the iron concentrate is 0.06%, and the recovery rate of iron is 92%.

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Abstract

The invention relates to an industrial production method for conducting iron increase and phosphorous reduction on high-phosphorus oolitic hematite. The method comprises the steps that high-phosphorus oolitic hematite powder, bonding agents and dephosphorization agents are mixed uniformly and prepared into green pellets, and the green pellets are subjected to oxidizing roasting, so that pellets are obtained; oxide pellets or cold bonded pellets are placed in a two-section shaft furnace and induced into magnetite pellets containing gangue through a selective direct-reduction method; high-temperature CO-CO2 mixed gas is introduced into the bottom of a reduction section of the shaft furnace, and normal-temperature CO-CO2 mixed gas is introduced into the bottom of a cooling section; and the reduced magnetite pellets are crushed and fine ground, magnetized high-phosphorus ore powder is obtained and conveyed into a magnetic separator to be subjected to magnetic separation, and finally high-grade low-phosphorus iron ore concentrate and high-phosphorus tailings are produced. The industrial production method has the remarkable advantages of being suitable for large-scale industrial production, environmentally friendly, low in energy consumption, good in economic benefit and the like.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and specifically refers to an industrial production method for increasing iron and reducing phosphorus on high-phosphorus oolitic hematite. Background technique [0002] my country is rich in oolitic hematite resources and has great resource potential. According to the results of chemical analysis of oolitic hematite, its main chemical composition is: Fe 2 o 3 30~70wt%, Al 2 o 3 3~20wt%, SiO 2 0 to 35 wt%, CaO 0 to 25 wt%, and P 0.30 to 3.0%. Due to the low iron grade and high P content of oolitic hematite, further beneficiation is required to increase the iron grade and reduce the phosphorus content before it can be directly used in blast furnace ironmaking. [0003] Because the iron minerals in oolitic hematite are extremely fine in particle size, they often co-exist or wrap with siderite, oolitic chlorite and phosphorus-containing minerals. Hematite is closely embedded in ring-shaped...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/214C22B1/243C22B1/11B03C1/015
CPCC22B1/214B03C1/015C22B1/11C22B1/243
Inventor 张伟薛正良张菊花
Owner WUHAN UNIV OF SCI & TECH
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