A dry separation process of iron ore based on dense phase gas-solid fluidized bed
A fluidized bed and iron ore technology, applied in the direction of separating solids from solids with airflow, solid separation, chemical instruments and methods, etc., can solve problems such as pollution, water resource consumption and the environment, and achieve simple recovery process, Solve the effect of poor density stability, avoid consumption and environmental pollution
Active Publication Date: 2017-03-29
CHINA UNIV OF MINING & TECH
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Problems solved by technology
[0005] The purpose of the present invention is to provide a dry separation process for iron ore based on a dense-phase gas-solid fluidized bed to solve the problems of water resource consumption and environmental pollution in the existing wet separation of iron ore
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Embodiment 1
[0026] Embodiment 1: The combined process of dense phase gas-solid fluidized bed and dry magnetic separation of iron ore according to the present invention includes: ore preparation stage, roughing stage, beneficiation stage, medium purification stage, air supply stage and dust removal stage.
[0027] Specific process flow:
[0028] 1. The raw ore is crushed by the jaw crusher, screened through a double-layer sieve, that is, a 6mm sieve and a 100mm sieve, and the ore larger than 100mm is returned to the crusher for further crushing. After the moisture content of the material is qualified, it can be fed into the fluidized bed of solid and heavy medium, and the ore smaller than 6mm enters the subsequent classification treatment;
[0029] 2. The 6-100mm particle size ore is sorted by fluidized bed to obtain floating and sinking objects, and then pass through 1mm de-mediation sieve for de-mediation, and the sinking products pass through the closed-circuit grinding operation compo...
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Abstract
The invention discloses an iron ore dry separation technology based on a concentrated-phase gas-solid fluidized bed, and belongs to an iron ore dry separation technology. The technology comprises the steps that iron ore is crushed, screening is performed with a two-layer screen, and materials with the particle size of 6-100 mm are processed with a gas-solid dense medium fluidized bed separator to obtain floating substances and sunk substances; materials with the particle size of 1-6 mm are separated with a vibrated fluidized bed, closed circuit grinding is performed on roughing concentrate obtained through separation after media are removed, then the roughing concentrate is fed into a dry strong magnetic separator for fine selection to obtain concentrate and tailings, and materials which are obtained through classification and are smaller than 1 mm need to be processed through a segment of closed circuit grinding, a segment of low-intensity magnetic separation and a segment of strong magnetic separation to obtain concentrate and tailings; medium solids mixed in fluidized bed separation products are screened out through a medium drainage screen, non-magnetic impurities in the fluidized bed separation products are removed through magnetic separation, and obtained magnetic separation concentrate serves as recycling media for recycling; an air inducing device is arranged to recycle dust generated in the separation process. According to the iron ore dry separation technology based on the concentrated-phase gas-solid fluidized bed, physical dry separation is adopted in the whole process, water resources do not need to be consumed, energy conservation and environment protection are achieved, and the important significance for efficient utilization of iron ore resources in China and energy conservation and emission reduction is achieved.
Description
technical field [0001] The invention relates to an iron ore dry separation process, in particular to an iron ore dry separation process based on a dense-phase gas-solid fluidized bed. [0002] technical background [0003] my country is rich in iron ore resource reserves. With the development of the iron and steel industry, the reserves of rich iron ore and easy-to-select lean iron ore are becoming increasingly exhausted. The domestic iron and steel industry relies too much on imported ore. In order to ensure the supply security of iron ore resources in my country, it is of great strategic significance to carry out research on efficient iron ore separation technology. [0004] At present, iron ore beneficiation usually adopts methods such as roasting magnetic separation, flotation, gravity separation and strong magnetic separation. The method of using roasting magnetic separation is to heat the ore to a certain temperature and carry out physical and chemical reactions in the...
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IPC IPC(8): B07B9/00
CPCB07B9/00
Inventor 贺靖峰赵跃民洪普周恩会骆振福段晨龙陈增强董良张博
Owner CHINA UNIV OF MINING & TECH