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Method for preparing micro-nano iron powder through hydrogen reduction of ultra-pure iron ore concentrate

An ultra-pure iron concentrate, micro-nano technology, applied in the direction of nano-technology, process efficiency improvement, etc., can solve the problems that cannot meet the particle size requirements, micro-nano iron powder is difficult to achieve mass production, low-cost mass production, etc., to achieve The effect of improving the reduction reaction efficiency, cheap raw materials, and stable sources

Pending Publication Date: 2022-07-08
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the defects in the prior art that the production of micro-nano-scale iron powder by carbonyl method and electrolysis method is difficult to achieve mass production at low cost, and other production methods cannot meet the particle size requirements, the purpose of the present invention is to provide a A method for preparing micro-nano iron powder. This method can use low-priced iron concentrate as raw material to directly obtain iron powder with high purity and controllable particle size at the nanometer or micrometer level. The preparation process is simple, green and environmentally friendly, and is beneficial to large-scale mass production

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  • Method for preparing micro-nano iron powder through hydrogen reduction of ultra-pure iron ore concentrate
  • Method for preparing micro-nano iron powder through hydrogen reduction of ultra-pure iron ore concentrate
  • Method for preparing micro-nano iron powder through hydrogen reduction of ultra-pure iron ore concentrate

Examples

Experimental program
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Effect test

Embodiment 1

[0034] This example is directed to the production of micro- and nano-scale iron powders.

[0035]The ultra-pure iron concentrate was prepared by beneficiation, the iron grade was 71.6%, and the particle size distribution was in the range of 20-80 μm. The ultra-pure iron concentrate was placed in a planetary ball mill, and ceramic grinding beads were added. The ratio of material to ball is 1:1, the rotating speed is set to 270r / min, and the work is 60min, and the micron-level ultra-pure iron ore is obtained by grinding, and the D50 is about 10 microns. After grinding, the material is added to the nano-sand mill, and the main parameters are set as follows: the diameter of the grinding beads is 0.3mm zirconia grinding beads, the material-to-ball ratio is 1:1, the pure water is the grinding medium, the solid-liquid ratio is 1:7, the polyethylene Pyrrolidone (PVP) is a dispersant, the addition amount is 0.7%, and the motor speed is 2400r / min. After grinding for 6 hours, take it ou...

Embodiment 2

[0038] This embodiment has higher requirements for the production of iron powder with regard to particle size and purity.

[0039] The ultra-pure iron ore concentrate is prepared by beneficiation, which is characterized by the more strict and cumbersome beneficiation process, the iron grade is 72.1%, and the particle size distribution is in the range of 20-60 μm, which is suitable for the production of products with higher purity. Place the ultra-pure iron ore concentrate in the stirring mill, add ceramic grinding beads, the diameter of the grinding beads is 2mm, the material-to-ball ratio is 1:1, alcohol is added as the grinding medium, the solid-liquid ratio is 1:3, and the speed is set to 2500r / min , work for 4 minutes, and grind to obtain micron-scale ultra-pure iron ore concentrate with D90 of 17 microns and D50 of 8 microns. After grinding, the material is added to the nano-sand mill, and the main parameters are set as follows: the diameter of the grinding beads is 0.1mm...

Embodiment 3

[0043] Embodiment 3 (comparative example)

[0044] The processing technology of iron concentrate is the same as that in Example 1, and the iron concentrate is ground and dried in two stages to obtain ultra-fine-grained powder.

[0045] The powder is loosely distributed on the steel belt of the steel belt reduction furnace, the material height is 5mm, the temperature of the reduction section is set to 800°C, the speed of the machine is controlled to adjust the reduction time to 3h, and the amount of hydrogen introduced during this time is controlled to be required by the material reduction theory. 5 times the amount of hydrogen. In this production process, due to the increase of the reduction temperature and the extension of the reduction time, the hydrogen utilization rate in the reduction process is high and the product impurity content is lower. The subsequent ultrasonic process is depolymerized, and if the reduced iron is finely ground by mechanical grinding, on the one ha...

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Abstract

The invention discloses a method for preparing micro-nano iron powder through hydrogen reduction of ultra-pure iron ore concentrate. The method comprises the following steps: sequentially carrying out coarse grinding and superfine grinding on the ultra-pure iron ore concentrate to obtain micro-nano iron ore concentrate slurry; the micro-nano iron ore concentrate slurry is subjected to nano drying, and micro-nano ultrapure iron ore concentrate powder is obtained; and the ultra-pure iron ore concentrate powder is subjected to low-temperature reduction roasting, a low-temperature reduction roasting product is subjected to depolymerization and surface coating treatment and then dried, and the micro-nano iron powder is obtained. The method is low in cost, simple in process, green, environmentally friendly and particularly suitable for preparing the high-purity micro-nano iron powder with the particle size being smaller than 1 micron, and the iron powder has the nearly-spherical morphology, is uniform and adjustable in particle size and can be widely applied to the field of conventional powder metallurgy or the field of functionalization of magnetic materials, catalysis, water purification materials and the like.

Description

technical field [0001] The invention relates to a method for preparing micro-nano iron powder, in particular to a method for preparing micro-nano iron powder by hydrogen reduction of ultrapure iron concentrate, and belongs to the technical field of nano metal material preparation. Background technique [0002] Ultra-pure iron concentrate is an important raw material for powder metallurgy, magnetic materials, ultra-pure iron and clean steel base materials. It is mainly obtained from coarse-grained crystal Anshan-type magnetite quartzite iron ore through flotation and magnetic separation. It is an iron concentrate with an iron grade higher than 71.50% and a content of silica and other impurities less than 0.30%. In the case of a lower yield, a purer ore powder can be obtained, which is suitable for the production of higher-value products. Ultra-high purity and ultra-fine particle size are the keys to high-value utilization of reduced iron powder. Due to its large specific sur...

Claims

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Application Information

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IPC IPC(8): B22F9/22C21B13/00B82Y40/00
CPCB22F9/22C21B13/0073B82Y40/00Y02P10/20
Inventor 甘敏范晓慧李浩锐季志云孙增青陈许玲黄晓贤郭恩狄吕浩王晓龙
Owner CENT SOUTH UNIV
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