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Microwave fluidized roasting-leaching method for reinforcing high phosphorous iron ore iron-extracting and phosphorus-reducing

A fluidized roasting and iron ore technology, which is applied in the field of mineral processing, can solve the problem that the separation index of high-phosphorus oolitic hematite is not significant, and achieve the development and utilization of resources and high efficiency, improvement effects, The effect of low energy consumption

Active Publication Date: 2019-01-04
NORTHEASTERN UNIV
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  • Abstract
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Problems solved by technology

[0005] Aiming at the above-mentioned technical problems such as the inconspicuous separation index of existing high-phosphorus oolitic hematite, the present invention provides a microwave fluidized roasting-leaching method that strengthens the iron ore and phosphorus reduction of high-phosphorus iron ore. After microwave fluidized roasting, ore grinding and weak magnetic separation to obtain weak magnetic concentrate, and acid leaching to obtain phosphorite iron concentrate

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  • Microwave fluidized roasting-leaching method for reinforcing high phosphorous iron ore iron-extracting and phosphorus-reducing

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Embodiment 1

[0045] The structure of microwave fluidized roasting furnace is as follows: figure 1As shown, it includes a reaction chamber (2) and a microwave cavity (3) that is enclosed within it. The reaction chamber (2) is a cylindrical shape with upper and lower ends closed, and a quartz mesh (15) is provided inside; a thermocouple (10) Insert from the top of the reaction chamber (2), there is a gap between the bottom of the thermocouple (10) and the quartz mesh (15); the bottom of the reaction chamber (2) is provided with a protective gas inlet and a reducing gas inlet , the top is provided with an exhaust port (12); the microwave cavity (3) is equipped with a microwave generating device outside, and the microwave generating device is composed of a waveguide (5), a magnetron (8) and an antenna cap (6), and the waveguide (5 ) is connected to the power supply (4), the waveguide (5) is equipped with a magnetron (8), the magnetron (8) is equipped with a microwave power meter (9), and the a...

Embodiment 2

[0054] The device that adopts is with embodiment 1;

[0055] Method is with embodiment 1, and difference is:

[0056] (1) the iron grade of high-phosphorus oolitic hematite is 45%, and the mass percentage of phosphorus is 0.8%;

[0057] (2) Grinding the ore until the part with a particle size≤0.074mm accounts for 80% of the total mass to obtain iron ore powder;

[0058] (3) Heating to a reaction temperature of 570° C. under reducing atmosphere conditions, and roasting for 6 minutes; the reducing gas accounts for 20% of the total volume of the mixed gas; the reducing gas is H 2 ;

[0059] (4) Grinding the roasted ore until the particle size is ≤0.038mm accounts for 75% of the total mass, and the magnetic field strength of the weak magnetic separation is 82kA / m;

[0060] (5) The sulfuric acid concentration used during acid leaching dephosphorization is 0.25mol / L, the liquid-solid ratio of sulfuric acid and magnetic separation iron ore concentrate is 2mL / g, and the time of aci...

Embodiment 3

[0063] The device that adopts is with embodiment 1;

[0064] Method is with embodiment 1, and difference is:

[0065] (1) The iron grade of high-phosphorus oolitic hematite is 46%, and the mass percentage of phosphorus is 0.9%;

[0066] (2) Grinding the ore until the part with a particle size≤0.074mm accounts for 90% of the total mass to obtain iron ore powder;

[0067] (3) heating to reaction temperature 550 DEG C under reducing atmosphere conditions, roasting 8mi; reducing gas accounts for 25% of the total volume of mixed gas; described reducing gas is H 2 ;

[0068] (4) Grinding the roasted ore until the particle size is ≤0.038mm accounts for 80% of the total mass, and the magnetic field strength of the weak magnetic separation is 83kA / m;

[0069] (5) The sulfuric acid concentration used during acid leaching dephosphorization is 0.3mol / L, the liquid-solid ratio of sulfuric acid and magnetic iron concentrate is 4mL / g, and the time for acid leaching dephosphorization is 60...

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Abstract

The invention discloses a microwave fluidized roasting-leaching method for reinforcing high phosphorous iron ore iron-extracting and phosphorus-reducing. The method is performed according to the following steps: (1) preparing high phosphorous iron ore as a raw material; (2) grinding the ore after crushing, to obtain iron ore powder; (3) sending to a microwave fluidized roasting furnace, and roasting in a reducing atmosphere condition; (4) after levigating the roasted ore, performing low intensity magnetic separation; (5) performing acid leaching dephosphorization by using sulfuric acid, afterthe acid leaching dephosphorization, filtering and separating a solid material; washing the solid material, and drying. The method is capable of realizing efficient comprehensive utilization of the high phosphorous iron ore, high in iron grade and recovery rate, remarkable in phosphorus-reducing effect. A technology is more energy-saving and cost-reducing, and the iron-extracting and phosphorus-reducing effect is more remarkable. Recycling and efficient development and utilization of high phosphorous oolitic hematite are realized.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to a microwave fluidized roasting-leaching method for strengthening iron ore and phosphorus reduction of high-phosphorus iron ore. Background technique [0002] The total amount of iron ore in my country is large, but a large number of "poor, fine, miscellaneous" weak magnetic iron ore resources have not been effectively developed and utilized. Among them, oolitic hematite resources have reserves of more than 10 billion tons, accounting for about 100 million tons of domestic iron ore. 12% of the total reserves of resources, accounting for 30% of my country's hematite reserves, Hubei Exi Iron Mine, Hebei Xuanlong Iron Mine, Hunan Ningxiang Iron Mine, Guangxi Tunqiu Iron Mine, etc. are all oolitic hematite types; Oolitic hematite is mainly composed of oolitic, kidney-shaped and bean-shaped structures; oolitic grains have hematite (or quartz, clay minerals) as the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/10B03C1/02C22B3/08
CPCB03C1/02C22B1/10C22B3/08Y02P10/20
Inventor 韩跃新周文涛孙永升李艳军高鹏
Owner NORTHEASTERN UNIV
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