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Method for treating refractory red iron ore based on staged combined magnetizing roasting

A technology of magnetization roasting and flash magnetization roasting, which is applied in the field of metallurgy, fluidization, and mineral processing, can solve the problems of low grade of concentrated ore in strong magnetic separation, coarse particle size of roasted ore, and uneven quality of roasted ore, so as to reduce grinding Cost, good quality of beneficiation products, improvement of reaction speed and roasting efficiency

Active Publication Date: 2018-09-14
CHANGSHA RES INST OF MINING & METALLURGY
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Problems solved by technology

[0004] Chinese patent CN201410110371.5 discloses a combined processing method for classification of refractory iron ore powder ore. This method proposes a combined process for classifying iron ore, using rotary kiln magnetization roasting for coarse-grained grades, and strong magnetic separation for fine-grained grades. , although this process can alleviate the problem of ring formation in the rotary kiln, it has the defects of low grade of fine-grained strong magnetic concentrate and low metal recovery rate
[0006] Chongqing Jielong Iron Mine has also conducted semi-industrial tests on siderite with 20-75mm lump ore roasting in a shaft furnace and 0-20mm fine ore roasting in a rotary kiln. Moreover, the presence of fine-grained fines makes the rotary kiln roasting easy to form rings, and only the separation indicators of concentrate grade of 55% to 57% and metal recovery rate of 75% to 79% can be obtained.

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  • Method for treating refractory red iron ore based on staged combined magnetizing roasting

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Embodiment 1

[0035] The useful minerals of the refractory hematite processed in this embodiment are mainly siderite, and also contain a small amount of hematite, limonite and false hematite; the gangue minerals are mainly quartz and sericite, and a small amount of long Stone, kaolinite, barite, apatite and other sporadic distribution. Siderite minerals crystallize well, and the crystal grains are often euhedral and semi-euhedral in different sizes, and some are irregular. The embedded particle size is generally between 0.02 and 0.35mm, and the small ones can be less than 0.01mm. The content of hematite and limonite is not high, the two are closely inlaid, and often exist in the form of aggregates, the aggregate particle size is generally 0.02 ~ 0.20mm.

[0036] A method of refractory red iron ore processing based on graded combined magnetization roasting of the present invention, its process flow chart is as follows figure 1 shown, including the following steps:

[0037] (1) Use a vibrat...

Embodiment 2

[0043] The useful minerals in the refractory red iron ore processed in this embodiment are mainly specularite, siderite and limonite, a small amount of magnetite and pyrite, and the gangue minerals are mainly jasper, quartz and barite , iron dolomite, chlorite and sericite, etc. The specularite and limonite are mainly fine-grained, the siderite is mainly medium-grained, and the gangue minerals are medium-coarse-grained and mainly medium-grained.

[0044] A method for processing refractory red iron ore based on graded combined magnetization roasting of the present invention comprises the following steps:

[0045] (1) Use a vibrating screen to screen and classify the crushed refractory red iron ore raw ore, and divide it into powder mineral materials of 0-15 mm and lump mineral materials of 15-75 mm;

[0046] (2) Use Raymond Mill to carry out dry powder milling on the powdered mineral material to obtain fine-grained powdered mineral material with a uniform particle size of -0.0...

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Abstract

The invention provides a method for treating refractory red iron ore based on staged combined magnetizing roasting. The method comprises the following steps of (1) crushed refractory red iron ore rawore is screened and classified, and the crushed refractory red iron ore raw ore is divided into a powder ore material and a lump ore material; (2) dry powder preparation is carried out on the powder ore material, a fine grain powder ore material is obtained, flash magnetizing roasting of the fine grain powder ore material is carried out, and a powder ore roasting ore is obtained; and magnetizing roasting is carried out on the lump ore material by adopting a vertical furnace or a rotary kiln, and a lump ore roasting ore is obtained; (3) the lump ore roasting ore is carried out pre-selection tailing, so that lump ore tailing rough concentrate ore is obtained, and tailing ore is directly thrown away; and (4), the lump ore tailing rough concentrate ore is carried out a primary grinding and classifying operation, and a primary classifying overflow product is obtained; and the primary classifying overflow product and the lump ore roasting ore are combined to enter a sorting process, a finaliron ore concentrate product is obtained, and the tailing is directly thrown away. The method for treating refractory red iron ore based on staged combined magnetizing roasting has the advantages of being simple in process, stable in control, energy-saving and environment-friendly, high in adaptability, and good in beneficiation product quality.

Description

technical field [0001] The invention belongs to the technical field of ore dressing, metallurgy and fluidization, and in particular relates to a method for processing refractory red iron ore based on classification combined magnetization roasting. Background technique [0002] my country's iron ore resources are relatively rich. As of the end of 2014, the ascertained resource reserves reached 84.34 billion tons, but most of them are "poor", "fine" and "miscellaneous" ores with poor quality; about 20% of them are fine-grained hematite, Limonite, siderite and their symbiotic ores, currently commonly used physical beneficiation technology cannot make full use of such ores. Although the grade and recovery rate of iron concentrate are difficult to improve after repeated strong (weak) magnetic and flotation, at present Most of these ores have not been developed and utilized, except for a few mining areas that have been mined and utilized. The rapid development of my country's natio...

Claims

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Application Information

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IPC IPC(8): C22B1/02C22B1/00
CPCC22B1/00C22B1/02
Inventor 李家林刘小银陈雯赵强陆晓苏彭泽友张立刚严小虎廖振鸿
Owner CHANGSHA RES INST OF MINING & METALLURGY
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