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A method for precise control of air-cooling of iron-containing materials, enhanced sorting and simultaneous recovery of latent heat

A material and precise technology, applied in chemical instruments and methods, solid separation, magnetic separation, etc., can solve the problems of large coercive force of artificial magnetite, reduce the quality of concentrates, reduce the coercive force of iron minerals, etc. Reduce coercivity, improve product quality, reduce the effect of magnetic agglomeration

Active Publication Date: 2022-05-10
NORTHEASTERN UNIV LIAONING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Patents CN 107630139 and CN108396134 proposed a fluidized reduction roasting method and recovered waste heat. The hot flue gas discharged from the roaster was purified and discharged through a suspension preheating device and material heat exchange. At the same time, the waste heat of the roasted ore was recovered to ensure reduction Good roasted ore is not re-oxidized, and waste heat utilization is realized to a certain extent; however, industrial tests have shown that artificial magnetite has a relatively high coercive force, and gangue is easily mixed into the concentrate in the subsequent weak magnetic separation process, reducing the Concentrate Quality
[0006] Studies have shown that under certain conditions, artificial magnetite can be transformed into γ-Fe with stronger magnetic properties. 2 o 3 It will reduce the coercive force of iron minerals and reduce the occurrence of magnetic agglomeration. At the same time, the artificial magnetite will be oxidized to γ-Fe 2 o 3 During the process, a part of latent heat will also be released, none of the above patents recover latent heat

Method used

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  • A method for precise control of air-cooling of iron-containing materials, enhanced sorting and simultaneous recovery of latent heat
  • A method for precise control of air-cooling of iron-containing materials, enhanced sorting and simultaneous recovery of latent heat
  • A method for precise control of air-cooling of iron-containing materials, enhanced sorting and simultaneous recovery of latent heat

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Process such as figure 1 shown;

[0047] After the iron-containing material is dehydrated and suspended for reduction and roasting, the resulting reduced roasting material is transported to the nitrogen-cooled cyclone separator group; the particle size of the reduced roasting material -0.074mm accounts for 85% of the total mass, and the temperature of the reduced roasting material 530°C, the Fe content of magnetite in the reduced roasting material accounts for 95% of the total Fe in the reduced roasting material; a contact heat exchanger is installed inside the nitrogen cooling cyclone separator group; the iron-containing material is a complex refractory ore;

[0048] The nitrogen-cooled cyclone separator group is composed of two-stage nitrogen-cooled cyclone separators. The outlet of the first-stage nitrogen-cooled cyclone separator is connected to the feed port of the second-stage nitrogen-cooled cyclone separator. The second-stage nitrogen-cooled cyclone separator T...

Embodiment 2

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

[0056] (1) Particle diameter-0.074mm of the reduction roasting material accounts for 80% of the total mass, the temperature of the reduction roasting material is 510° C., and the Fe content of magnetite in the reduction roasting material accounts for 97% of the total Fe in the reduction roasting material;

[0057] (2) The reduced roasted material is cooled to 230°C in the nitrogen cooling cyclone group; the residence time of the reduced roasted material in the nitrogen cooled cyclone group is 20min;

[0058] (3) The residence time of the cooling roasting material in the air-cooling cyclone separator group is 4min;

[0059] (4) The magnetic field intensity of weak magnetic separation is 1300Oe; the iron grade TFe of iron concentrate is 57.36%; the recovery rate of Fe is 84.13%; The iron grade of the concentrate increased by 1.56%, and the iron recovery decreased by 0.57%.

Embodiment 3

[0061] Method is with embodiment 1, and difference is:

[0062] (1) Particle diameter-0.074mm of the reduction roasting material accounts for 77% of the total mass, the temperature of the reduction roasting material is 550 ° C, and the Fe content of magnetite in the reduction roasting material accounts for 93% of the total Fe in the reduction roasting material;

[0063] (2) The reduced calcined material is cooled to 210° C. in the nitrogen cooling cyclone group; the residence time of the reduced calcined material in the nitrogen cooled cyclone group is 25 min;

[0064] (3) The residence time of the cooling roasting material in the air cooling cyclone separator group is 3min;

[0065] (4) the magnetic field intensity 2000Oe of weak magnetic separation; the iron grade TFe57.45% of iron concentrate; The iron grade of the iron concentrate was increased by 1.67%, and the iron recovery rate was decreased by 0.25%.

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Abstract

A method for air-cooled, air-cooled, precise control, enhanced sorting, and synchronous latent heat recovery of latent heat, which is carried out in the following steps: (1) After the iron-containing material is dehydrated and suspended, reduced and roasted, the reduced roasted material generated is transported to a nitrogen-cooled cyclone separator group, the iron-containing material is complex and refractory ore; (2) the reduced roasted material is cyclone separated under nitrogen atmosphere and cooled to 200-300 ° C, and the cooled roasted material enters the flow sealing valve; (3) the air cooling cyclone separator group is passed (4) The cooled roasted material enters the air-cooled cyclone separator group for cyclone separation, and undergoes oxidation reaction with oxygen, and the temperature is lowered to ≤100°C; (5) The oxide material is subjected to weak magnetic separation. The method of the present invention can realize timely air-cooling of materials, and accurately control the conversion of artificial magnetite into γ-Fe by contacting air at a suitable temperature 2 o 3 , Reduce the coercive force of iron minerals, reduce magnetic agglomeration, improve product quality, recover sensible heat and latent heat.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to a method for air-cooling precision regulation and enhanced sorting of iron-containing materials to recover latent heat synchronously. Background technique [0002] With the depletion of high-grade iron ore resources, it is more and more urgent to mine low-grade refractory iron ore. Refractory iron ore is rich in reserves, but due to the low grade of iron ore, complex mineral composition, and fine particle size distribution, traditional processing methods such as gravity separation, magnetic separation, flotation and other combined beneficiation processes are still unable to efficiently process refractory iron ore Iron ore resources; a large number of laboratory tests, semi-industrial and industrial tests have proved that magnetization roasting-weak magnetic separation technology is an effective technology for processing refractory iron ore; At the same tim...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B03C1/005B03C1/02C22B1/02C22B1/26
CPCB03C1/015B03C1/02C22B1/02C22B1/26
Inventor 韩跃新李艳军张琦袁帅高鹏孙永升
Owner NORTHEASTERN UNIV LIAONING
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