Method for preparing high-quality iron mineral concentrates from high phosphorus oolitic hematite through chemical impurity reduction

A technology of oolitic hematite and iron concentrate, applied in the field of mineral processing engineering, can solve the problems of difficult development and utilization, serious discharge pollution, etc., and achieve the effects of improving grade, high iron recovery rate, and changing microstructure

Inactive Publication Date: 2019-06-28
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In summary, the problems in the prior art are: the existing high-phosphorus oolitic hematite is difficult to develop and utilize, and the discharge pollution is serious

Method used

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  • Method for preparing high-quality iron mineral concentrates from high phosphorus oolitic hematite through chemical impurity reduction
  • Method for preparing high-quality iron mineral concentrates from high phosphorus oolitic hematite through chemical impurity reduction

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Effect test

Embodiment 1

[0042] A high-phosphorus oolitic hematite in Guizhou, with a grade of 39.52% iron and SiO 2 26.35%, containing Al 2 o 3 5.44%, containing 1.32% phosphorus, the ore is reddish-brown to brown-red, the main useful mineral red (brown) iron ore is 72.4%, oolitic structure, oolitic grains are ellipsoidal or oblate, oolitic grains are closely packed, and oolitic grains Between them are cemented by hematite and clay minerals; the gangue minerals are mainly quartz, dolomite and collophosite, the contents of which are 14.5%, 8% and 3.5% respectively. The alkali ore ratio is 1:3, the grinding concentration is 60%, and the ore is ground to -200 mesh 75%. Stir and leaching in the high-pressure reactor for 1 hour, the leaching temperature is 250°C, and the leaching pressure is 2MPa. After filtering, add lime to the filtrate milk SiO 2 、Al 2 o 3 The concentration is reduced to below 1g / l and circulated as a leaching agent, and the precipitated silicon slag is effectively SiO 2 And high...

Embodiment 2

[0044] The main iron mineral of high-phosphorus oolitic hematite in a certain place in Hubei is hematite, which has high content of harmful impurities phosphorus, silicon and aluminum, which is difficult to be effectively utilized. For this crude ore, the iron grade is 46.31%, and the phosphorus content is 1.25% high phosphorus oolitic hematite crude ore. The alkali-mineral ratio is 1:5, the grinding concentration is 80%, and the ore is ground to -200 mesh 80%, stirred and leached in a high-pressure reactor for 2 hours, the leaching temperature is 150°C, and the leaching pressure is 0.5MPa. Cool down and filter, and the filtrate SiO 2 Concentration and Al 2 o 3 The concentration is reduced to below 1g / l and circulated as a leaching agent, and the precipitated silicon slag is effectively SiO 2 And higher CaO, can be directly used as soil conditioner. After the filter residue was washed, it was stirred and leached with 3% sulfuric acid at normal temperature and pressure for ...

Embodiment 3

[0046] A high-phosphorus oolitic hematite in Yunnan, with a grade of 31.52% iron and SiO 2 10.96%, containing Al 2 o 3 4.93%, containing 0.87% phosphorus, the main useful element in the ore is iron, and the main harmful impurity is phosphorus. The alkali ore ratio is 1:2, the grinding concentration is 75%, and the ore is ground to -200 mesh 85%, stirred and leached in the high-pressure reactor for 0.5 hours, the leaching temperature is 300°C, the leaching pressure is 3MPa, the temperature is cooled and filtered, and the filtrate is added milk of lime SiO 2 Concentration and Al 2 o 3 The concentration is reduced to below 1g / l and circulated as leaching agent. Filter residue washing, precipitated silicon slag effective SiO 2 And higher CaO, can be directly used as soil conditioner. After washing, stir and leaching with 6% oxalic acid at normal temperature and pressure for 1 hour, filter and wash to obtain iron grade of 68.43%, containing SiO 2 1.05%, containing Al 2 o ...

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Abstract

The invention belongs to the technical field of mineral processing engineering and discloses a method for preparing high-quality iron mineral concentrates from high phosphorus oolitic hematite throughchemical impurity reduction. The method for preparing the high-quality iron mineral concentrates from the high phosphorus oolitic hematite through chemical impurity reduction comprises the steps of dissolving out SiO2 and Al2O3 from the oolitic hematite through alkali under the heating and pressurizing conditions; dissolving out phosphorus from the oolitic hematite through dilute acid under the normal-temperature and normal-pressure conditions to obtain the high-quality iron mineral concentrates; and depositing SiO2 and Al2O3 from an alkali leaching solution through lime milk to serve as a leaching agent for cyclic utilization. According to the method, SiO2 and Al2O3 are deposited from the alkali leaching solution through the lime milk and serves as the leaching agent for cyclic utilization; the effective SiO2 and capable of content of deposited silica slag is high, the deposited silica slag can be directly used as a soil conditioner. The method has the characteristics of high iron recovery rate, alkaline cyclic utilization, comprehensive utilization of silicon and the like.

Description

technical field [0001] The invention belongs to the technical field of mineral processing engineering, and in particular relates to a method for preparing high-quality iron concentrate by chemically reducing impurities from high-phosphorus oolitic hematite. Background technique [0002] At present, the closest existing technology: oolitic hematite is hematite existing in the form of oolitic aggregates, and hematite mineral aggregates formed by layer-by-layer aggregation of hematite. Usually oolitic bodies are relatively small and cemented to each other. Oolitic hematite has extremely fine particle size, and generally coexists or wraps with phosphorus-containing minerals, oolitic chlorite, and siderite. It is precisely because of this characteristic of the oolitic hematite structure that it is very difficult to dissociate the monomer of the ore. And after crushing and grinding, the ore is easy to form fine particles, coupled with its large mud content, which is extremely un...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/12C22B3/08C22B3/16
CPCY02P10/20
Inventor 高利坤戴惠新谢海云饶兵蒋朋
Owner KUNMING UNIV OF SCI & TECH
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