Novel method for producing iron concentrates through complex refractory iron ore

A technology for iron ore and iron ore concentrate, which is applied in the field of complex refractory iron ore production of iron ore concentrate, and achieves the effects of good economy, nodulation prevention and stable product index.

Inactive Publication Date: 2016-07-20
NORTHEASTERN UNIV +1
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  • Application Information

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Problems solved by technology

[0005] Aiming at the above-mentioned problems existing in the processing technology of existing complex and refractory iron ores, the present invention provides a new method for producing iron concentrates with complex and refractory iron ores. After grinding, carry out magnetic separation pre-enrichment, then undergo high-temperature roasting and suspension reduction, and then perform grinding-magnetic separation-concentration to obtain iron concentrate products with an iron grade greater than 60% and an iron recovery rate greater than 80%

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  • Novel method for producing iron concentrates through complex refractory iron ore

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Embodiment 1

[0035] The complex refractory iron ore in this example is JISCO fine ore, which is a complex refractory iron ore containing specularite, limonite, siderite, hematite and other iron minerals , the iron grade is 37.1%, the current production index is the concentrate grade is 46-48%, the recovery rate is 60-70%, the process of producing iron concentrate is as follows figure 1 shown, follow the steps below:

[0036] (1) Crushing the complex and refractory iron ore to a particle size of ≤20mm, putting it into a closed-circuit grinding system composed of a ball mill and a cyclone for grinding and grading treatment, and obtaining the part of the graded overflow product with a particle size of -0.074mm accounting for the iron ore 55% of the total weight of the stone;

[0037] (2) Carry out magnetic separation pre-enrichment for graded overflow products. First, use weak magnetic separator to perform weak magnetic separation to obtain weak magnetic separation concentrate and weak magne...

Embodiment 2

[0044]The complex refractory iron ore in this embodiment is Donganshan iron ore, which is a complex refractory iron ore containing various iron minerals such as magnetite, limonite, siderite, and hematite. The iron grade is 33.25%. The current production index is 63% concentrate grade and 65% recovery rate. The process for producing iron concentrate is as follows: figure 1 shown, follow the steps below:

[0045] (1) Crushing the complex and refractory iron ore to a particle size of ≤20mm, putting it into a closed-circuit grinding system composed of a ball mill and a cyclone for grinding and grading treatment, and obtaining the part of the graded overflow product with a particle size of -0.074mm accounting for the iron ore 55% of the total weight of the stone;

[0046] (2) Carry out magnetic separation pre-enrichment for graded overflow products. First, use weak magnetic separator to perform weak magnetic separation to obtain weak magnetic separation concentrate and weak magne...

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Abstract

The invention belongs to the technical field of mineral machining and particularly relates to a novel method for producing iron concentrates through complex refractory iron ore. The novel method includes the steps that firstly, the complex refractory iron ore is subjected to ore grinding classifying treatment; classified overflow products are subjected to magnetic separation preconcentration, and powdery preconcentrated concentrates are obtained; the powdery preconcentrated concentrates are fed into a suspension roaster to obtain suspension roasted ore; water is added to the suspension roasted ore, and ore pulp is manufactured, preconcentration is conducted, and obtained magnetic concentrates serve as rough concentrates; and an electromagnetic separator is used for conducting concentration on the rough concentrates, the obtained concentrated concentrates are filtered, moisture is removed, concentrate products with the iron grade ranging from 60% to 68% are obtained, the recovery rate of iron ranges from 80%-90%, the concentrate products with the iron grade ranging from 60%-68% are subjected to reverse floatation desilicication, and concentrate products with the iron grade ranging from 61% to 69% are further obtained. The iron concentrate products with the iron grade larger than 60% are obtained, the recovery rate of iron is larger than 80%, product indexes are stable, the economical efficiency is good, and complex refractory iron ore resources can be efficiently utilized.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to a new method for producing iron concentrates from complex refractory iron ores. Background technique [0002] my country's iron ore resource endowment is poor, and the overall characteristics are low grade, fine particle size, and complex composition, which is commonly referred to as "poor, fine, and miscellaneous". As a result, more than 97% of iron ore needs to be crushed, ground, Magnetic separation, flotation and other complex beneficiation processes can be put into the furnace for smelting. Due to the complex and difficult selection of iron ore, the development and utilization of proven iron ore resources in my country is relatively low. At present, only 26.93 billion tons of proven resource reserves have been developed and utilized, and the resources in undeveloped mining areas are as high as 52.92 billion tons. The rate is less than 35%. [0003] At ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03C1/02B03C1/10C22B1/26
CPCB03C1/02B03C1/10C22B1/26
Inventor 韩跃新刘鹤群李艳军
Owner NORTHEASTERN UNIV
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