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Combined mineral separation technology for ferric oxide mineral

A technology for iron oxide and ore, which is applied in chemical instruments and methods, magnetic separation, solid separation, etc., can solve the problems of low iron grade in concentrate, low process efficiency, and less output of concentrate, so as to achieve concentrate grade and recovery Increased efficiency, high resource utilization, and reduced energy consumption

Inactive Publication Date: 2017-09-22
JIUQUAN IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims at the technical problems of low concentrate iron grade, high impurity content, low iron recovery rate, serious resource waste, high production cost, low process efficiency and less concentrate output in the existing mineral processing technology, and provides a high-efficiency , low energy consumption dry separation throwing tailing dry grinding fluidized reduction roasting combined mineral processing process

Method used

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  • Combined mineral separation technology for ferric oxide mineral

Examples

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Effect test

Embodiment 1

[0040] Take the beneficiation of an iron oxide ore with an iron grade of 34% in China as an example.

[0041] use as figure 1 Shown a kind of iron oxide ore joint mineral processing technology of the present invention, its processing step is as follows:

[0042] (1) Iron oxide ore dry selection and discarding: crush the mined iron oxide ore to a particle size of less than 30mm, screen into two products of 30-5mm coarse-grained grade and less than 5mm fine-grained grade, and enter the magnetic field strength 1.1 respectively T, the dry-type strong magnetic separator with a drum line speed of 1.2m / s performs dry separation and removal of waste rocks composed of surrounding rocks and intercalated rocks, and obtains pre-selected coarse-grained ores, pre-selected fine-grained ores and waste rocks;

[0043] (2) High-pressure roller mill crushing: feed the pre-selected coarse-grained ore obtained in step (1) into a high-pressure roller mill for closed-circuit crushing until the part...

Embodiment 2

[0056] Take the beneficiation of an iron oxide ore with an iron grade of 31% in China as an example.

[0057] use as figure 1 Shown a kind of iron oxide ore joint mineral processing technology of the present invention, its processing step is as follows:

[0058] (1) Iron oxide ore dry selection and discarding: crush the mined iron oxide ore to a particle size of less than 30mm, screen into two products of 30-5mm coarse-grained grade and less than 5mm fine-grained grade, and enter the magnetic field strength 0.9 T, the dry-type strong magnetic separator with a drum line speed of 1.5m / s performs dry separation and removal of waste rocks composed of surrounding rocks and intercalated rocks, and obtains pre-selected coarse-grained ores, pre-selected fine-grained ores and waste rocks;

[0059] (2) High-pressure roller mill crushing: feed the pre-selected coarse-grained ore obtained in step (1) into a high-pressure roller mill for open-circuit crushing until the particle size is le...

Embodiment 3

[0072] Take the beneficiation of an iron oxide ore with an iron grade of 30-48% in China as an example.

[0073] use as figure 1 Shown a kind of iron oxide ore joint mineral processing technology of the present invention, its processing step is as follows:

[0074] (1) Iron oxide ore dry selection and discarding: crush the mined iron oxide ore to a particle size of less than 30mm, sieve into two products of 30-5mm coarse-grained grade and less than 5mm fine-grained grade, and enter the magnetic field strength 0.8 T, the dry-type strong magnetic separator with a drum line speed of 1.8m / s performs dry separation and removal of waste rocks composed of surrounding rocks and intercalated rocks, and obtains pre-selected coarse-grained ores, pre-selected fine-grained ores and waste rocks;

[0075] (2) High-pressure roller mill crushing: feed the pre-selected coarse-grained ore obtained in step (1) into a high-pressure roller mill for closed-circuit crushing until the particle size i...

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Abstract

The invention discloses an iron oxide ore joint beneficiation process, which comprises the following steps: (1) dry selection and discarding of iron oxide ore to obtain pre-selected coarse-grained ore, pre-selected fine-grained ore and waste rock; (2) high-pressure Roller mill crushing: the pre-selected coarse-grained ore obtained in step (1) is fed into a high-pressure roller mill for crushing; (3) dry grinding: the crushed product in step (2) and the pre-selected fine-grained ore in step (1) Combined for dry closed-circuit grinding; (4) Fluidized reduction roasting: a. Put the ground product obtained in step (3) into the fluidized reduction roaster; b. Preheating; c. Heating; d. Magnetization roasting; e . Cool to below 200°C to obtain roasted ore with a magnetite content greater than 90%; (5) beneficiation of roasted ore to obtain iron concentrate products with a grade of 57%-65%. The present invention can effectively solve the current iron oxide ore beneficiation There are technical problems such as low resource utilization rate, poor concentrate quality and high energy consumption in the process.

Description

technical field [0001] The invention relates to the technical field of iron oxide beneficiation technology, in particular to a combined iron oxide ore beneficiation process. Background technique [0002] my country's iron ore resources are abundant, more than 60 billion tons, and the unidentified resources are predicted to be more than 100 billion tons. In addition, there are still a considerable number of low-grade iron ore resources. Among them, the iron ore resources that can be used in the deep edge of large and medium-sized mines in the near future About 20 billion tons. Although my country is rich in iron ore resources, the utilization rate is not high, less than 35%, and most of them are oxide ores, accounting for about 65% of the total reserves. The utilization of iron oxide ores generally adopts the following process for beneficiation: 1. It is raw ore-grinding-strong magnetic separation. Most iron oxide ore concentrators adopt this principle process, such as JISCO, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B02C21/00B02C23/12B03C1/10B03C1/30C22B1/10
CPCB02C21/00B02C23/12B03C1/10B03C1/30C22B1/10
Inventor 陈毅琳唐晓玲刘金长
Owner JIUQUAN IRON & STEEL GRP
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