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Fluidization roasting technology for processing iron ores

A technology of fluidized roasting and iron ore, applied in chemical instruments and methods, magnetic separation, solid separation, etc., can solve problems such as uneven quality of reduced products, poor discharge, and back-mixing of materials in the reduction reactor , to achieve the effect of improving roasting indicators, preventing harm to people, and preventing air pollution

Active Publication Date: 2018-09-28
NORTHEASTERN UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0006] In summary, although the existing fluidized roasting technology can greatly improve the iron grade and recovery rate, if the roasting process is not properly operated, there will still be serious back-mixing of the materials in the reduction reactor and uneven quality of the reduced products. Therefore, the development of a new type of fluidized roasting reaction device is of great significance for the effective control of gas-solid flow and chemical reactions in the reactor.

Method used

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  • Fluidization roasting technology for processing iron ores
  • Fluidization roasting technology for processing iron ores
  • Fluidization roasting technology for processing iron ores

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Embodiment 1

[0045] The iron ore used is the ore of a concentrator in Anshan area, which belongs to hematite-siderite mixed ore. The results of chemical composition analysis of the ore are shown in Table 1, and the results of iron phase analysis are shown in Table 2. It can be seen from Table 1 that the grade of TFe in the ore is 34.43%, the content of FeO is 9.24%, and the content of SiO 2 The content is 49.41%, and the content of harmful elements phosphorus and sulfur is relatively low, being 0.07% and 0.05% respectively. It shows that the main valuable element of the medium ore is iron, and the main impurity component is silicon. As can be seen from Table 2, the iron in brown (brown) iron ore is 26.01%, and the iron occupancy rate is 75.85%; the iron in iron carbonate is 4.98%, and the iron occupancy rate is 14.52%. : Hematite and Siderite.

[0046] Table 1 Analysis of ore chemical composition / %

[0047]

[0048] Table 2 Iron chemical phase analysis results / %

[0049]

[00...

Embodiment 2

[0055] The ore sample used is ore from a concentrator in Yunnan, which belongs to hematite-limonite complex refractory iron ore. The results of chemical composition analysis of the ore are shown in Table 4, and the results of iron phase analysis are shown in Table 5. It can be seen from Table 4 that the grade of TFe in the ore is 35.25%, the content of FeO is 9.24%, and the content of SiO 2 The content is 49.41%, and the harmful element phosphorus content is low, which is 0.88%. It shows that the main valuable element of the medium ore is iron, and the main impurity component is silicon. It can be seen from Table 5 that the iron in hematite (limonite) is 34.74%, and the iron occupancy rate is 98.85%. Therefore, the main recovery objects of this middle ore are: hematite and limonite.

[0056] Table 4 Analysis of ore chemical composition / %

[0057]

[0058] Table 5 Iron chemical phase analysis results / %

[0059]

[0060] The iron ore is finely ground to -0.074mm, acc...

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Abstract

The invention relates to a fluidization roasting technology for processing iron ores and belongs to the technical field of mineral processing. The fluidization roasting technology for processing the iron ores is characterized in that iron ore particles are continuously fed into a reduction reactor from the lower portion of the reduction reactor, reductive mixed gas flow entering the reduction reactor from the bottom of the reduction reactor is used for carrying the iron ore particles to move upward, and roasting is conducted on the iron ore particles at 500-600 DEG C; after roasting, the obtained solid material is continuously discharged out of the reactor via a material outlet on the upper portion of the reactor, a magnetic field is exerted to the reduction reactor at the same time, the intensity of the magnetic field is 40-60 kA / m, and the direction of the magnetic field is vertically upward. According to the fluidization roasting technology for processing the iron ores, the stable magnetic field is exerted around the reduction reactor, the flowing behavior of magnetic particles in the reactor is reasonably controlled, the gaseous-solid two-phase flow in the reactor is more stable, the gas is fully reacted with the iron ores, and the roasting efficiency is improved.

Description

technical field [0001] The invention relates to a fluidized roasting process for treating iron ore, belonging to the technical field of mineral processing. Background technique [0002] Iron ore is a guaranteed resource for my country's iron and steel industry and is a major strategic demand of the country. my country's iron ore resources are poor in endowment, difficult to use, and high in mining and dressing costs. Domestic iron ore has been in a serious shortage for a long time. In 2016, my country imported 1.024 billion tons of iron ore, and its dependence on foreign countries exceeded 86%, a record high. In February 2017, the import price of iron ore rose to US$90 / ton, which directly led to a substantial increase in the cost of importing iron ore in my country. This not only seriously affected my country's steel industry, but also posed a huge threat to the safe operation of the national economy. Among the complex and refractory iron ore resources in my country, fine-g...

Claims

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Application Information

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IPC IPC(8): C22B1/10B03C1/015
Inventor 高鹏唐志东韩跃新李艳军
Owner NORTHEASTERN UNIV
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