Method for extracting high-quality iron powder and borax from paigeite

A technology of boron ore and boron concentrate, applied in chemical instruments and methods, borates, boron oxides, etc., can solve the problems of poor boron activity, high energy consumption, and difficult separation of boron and iron, so as to improve the additional Value, reduce evaporation, increase the effect of crystallization rate

Active Publication Date: 2014-07-30
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0011] Aiming at the above-mentioned deficiencies in the prior art, the main purpose of the present invention is to overcome the problems of difficult separation of boron-containing iron ore concentrate, high energy consumption, and poor activity of boron, and to provide a method for extracting high-quality iron powder from boron-iron ore and Borax, a feasible process method for realizing the recycling of sodium carbonate as a reaction medium, provides an effective way for the comprehensive utilization of ferroboron resources

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  • Method for extracting high-quality iron powder and borax from paigeite

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Embodiment 1

[0038] Iron concentrate with 30wt% Na 2 CO 3It is mixed with 10wt% coal, and the mixed material and external coal blending are placed in a crucible in a tubular charging manner, kept at a temperature of 1100°C for 3 hours and then cooled, and the roasted product is crushed and ground (the particle size of the broken product is ≤ 10mm, the grinding fineness is -74μm and the content accounts for more than 40%) for leaching and washing, the leaching and washing temperature is 95°C, the leaching and washing time is 30min, the ratio of washing liquid to solid is 1:1, and the leaching rates of boron and sodium have reached more than 90 percent. The leaching slag is finely ground and magnetically separated to obtain a magnetically separated product (the fineness is -74μm, the content accounts for more than 80%, and the magnetic field strength is 60-100kA / m), and then dried in an inert atmosphere to obtain TFe>98.5% high-quality iron powder , The recovery rate of iron reaches more t...

Embodiment 2

[0040] Iron concentrate with 40%wt Na 2 CO 3 Mixed with 10%wt coal, the mixed material and external coal blending are placed in a crucible in a tubular charging manner, kept at a temperature of 1150°C for 4h and then cooled, and the roasted product is crushed and ground (the particle size of the crushed product is ≤10mm, the grinding fineness is -74μm and the content accounts for more than 40%) for leaching and washing, the leaching and washing temperature is 95°C, the leaching and washing time is 10min, the ratio of washing liquid to solid is 2:1, and the boron leaching rate reaches 90% above. The leaching slag is finely ground and magnetically separated to obtain a magnetically separated product (the fineness is -74μm, the content accounts for more than 80%, and the magnetic field strength is 60-100kA / m), and then dried in an inert atmosphere, the obtained TFe>98.5% high-quality iron The recovery rate of powder and iron reaches over 85%. Add lime milk to the alkaline filt...

Embodiment 3

[0042] Iron concentrate with 20% Na 2 CO 3 Mixed with 5%wt coal, the mixed material and external coal blending are placed in a crucible in a tubular charging manner, kept at a temperature of 950°C for 24 hours and then cooled, and the roasted product is crushed and ground (the particle size of the broken product is ≤ 10mm, the grinding fineness is -74μm and the content accounts for more than 40%) for leaching and washing, the leaching and washing temperature is 95°C, the leaching and washing time is 90min, the ratio of washing liquid to solid is 1.5:1, and the leaching rate of boron has reached 90%. above. The leaching slag is finely ground and magnetically separated to obtain a magnetically separated product (the fineness is -74μm, the content accounts for more than 80%, and the magnetic field strength is 60-100kA / m), and then dried in an inert atmosphere to obtain TFe>98.5% high-quality iron powder , The recovery rate of iron reaches more than 85%. Add lime milk to the al...

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Abstract

The invention belongs to the field of metallurgy of steel and iron and processing of mineral resources and specifically relates to a method for extracting high-quality iron powder and borax from paigeite. The method provided by the invention comprises the following steps: (1) mixing boron-containing iron concentrate, solid Na2CO3 and coal together to obtain a mixture; (2) roasting the mixture under a reducing atmosphere at the temperature of 950-1150 DEG C to obtain a roasted product; (3) crushing and grinding the roasted product and then, leaching, washing and filtering ore slurry to obtain an alkaline filtrate and an iron-containing filter cake; (4) performing desilication, CO2 carbonization, filtration and crystallization on the alkaline filtrate to obtain qualified borax and simultaneously realize recycling of reaction medium Na2CO3; (5) performing magnetic separation, grinding and secondary magnetic separation on the obtained filter cake to obtain high-quality reducing iron powder (TFe is more than 98.5%) which can be used as an iron-based raw material for powder metallurgy. According to the method provided by the invention, by adding a large amount of Na2CO3, the leaching of boron minerals is simultaneously realized during iron reduction, the process flow is shortened and the energy consumption is reduced.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy and mineral resources processing, in particular, the invention relates to a method for extracting high-quality iron powder and borax from boron iron ore. Background technique [0002] Wengquangou, Fengcheng, Liaoning has rich boron resources, accounting for 58% of the national boron reserves, mainly low-grade "black boron ore" (boron iron ore), of which w (TFe) is 27% to 30%, w (B 2 o 3 ) 6% to 8%, and the ore types are mainly boronite-magnetite type and boronite-magnetite type. [0003] Since the 1970s, a number of domestic units have carried out a large number of beneficiation experiments on Fengcheng boronite ore in Liaoning, and have achieved certain results. Basically, magnetite, boronite, and boronite in boronite have been basically realized. Separation and enrichment of useful minerals. However, since the main minerals of boronite are micro-fine particles and uneven distribution...

Claims

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Application Information

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IPC IPC(8): C22B1/02B03C1/02C01B35/12
Inventor 李永利齐涛曲景奎余志辉李洁赵宏欣
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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