Dephosphorus iron extraction production method of oolitic high phosphorus red iron ore

A technology of hematite and hematite powder, which is applied in the field of dephosphorization and iron extraction of oolitic high-phosphorus hematite, which can solve the difficulties of separation and separation without dephosphorization technology, iron ore resources have not been effectively mined and utilized and other problems, to achieve the effect of high dephosphorization rate and metal recovery rate, low energy consumption and simple process

Inactive Publication Date: 2007-01-31
WUHAN UNIV OF SCI & TECH
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Problems solved by technology

Due to the extremely fine grains of hematite (<10 μm), it is quite difficult to sort and separate (Cui Jirang, Fang Qixue, Huang Guozhi, Lu Shouci. Research status and development direction of high-phosphorus iron ore dephosphorization technology, Mineral Resources Utilization, 1998, 6 : 20~24, Wang Jing, Shang Yanbo, Zhang Qin. Preliminary study on flotation test of oolitic hematite, Mining and Metallurgy Engineering, 2004, 24(3): 38~40), so oolitic high phosphorus hematite Because there is no reasonable and feasible dephosphorization technology, this part of iron ore resources has not been effectively exploited and utilized

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Embodiment Construction

[0013] A method for dephosphorization and iron extraction of oolitic high-phosphorus hematite, the specific implementation mode is:

[0014] The oolitic high-phosphorus hematite in this embodiment is all powdered, the reducing agent is coal powder, and the flux is slaked lime. The quality requirements are: TFe of the oolitic high-phosphorus hematite>45wt%, particle size 2 The part with a particle size of <5wt% and a particle size of <0.1mm is greater than 50wt%.

[0015] Mix 60-80% oolitic hematite powder, 10-20% coke powder, and 3-20% slaked lime according to the weight percentage. After briquetting, it is dried, then quickly reduced and cooled in a high-temperature furnace. , The reduction temperature is 1100~1450℃, and the reduction time in the high temperature zone is 10~30min. After cooling, the reduced product is finely ground and magnetically separated, and finally the metallic iron particles are separated from the phosphorus-rich gangue or slag.

[0016] The heating furnac...

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Abstract

The present invention relates to a production method for dephosphorization and extracting iron from oolitic high-phosphorus haematite. Said method includes the following steps: uniformly mixing (by wt%) 60%-90% of oolitic high-phosphorus haematite powder, 8%-20% of coke powder or coal powder and 0-20% of lime hydrate, briquetting or balling, drying, making reduction at 1100 deg.C-1450 deg.C in high-temperature furnace, reduction time is 10-30 min, cooling reduced product, grinding and making magnetic separation, finally making the metal iron granules be separated from phosphorus-rich ganque or slag.

Description

Technical field [0001] The invention belongs to the technical field of dephosphorization of hematite, and particularly relates to a production method for dephosphorization and iron extraction of oolitic high-phosphorus hematite. Background technique [0002] Oolitic high-phosphorus hematite, also known as "Ningxiang-style" high-phosphorus hematite, has the characteristics of high phosphorus, high silicon, high aluminum, low sulfur, and medium-poor iron. The iron content of the ore is generally 35% to 55% by weight, and the phosphorus content is 0.4% to 0.6% by weight. Some of the ores contain more than 1.0% by weight of phosphorus. Some ore layers contain high CaO and are self-fluxing ore. This iron ore has an oolitic structure, and the hematite is scaly, fibrous and mixed with gangue minerals (Li Huiming. The development of high-phosphorus iron ore is expected, Ferrous Mines News, 1991(1): 8 ~10). Due to the extremely fine grains of hematite (<10μm), it is quite difficult to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B3/02C21C1/02
Inventor 薛正良周继程
Owner WUHAN UNIV OF SCI & TECH
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