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An on-line closed-circuit magnetization roasting dry grinding dry separation process for symbiotic refractory iron ore

A technology of magnetizing roasting and iron ore, which is applied in the field of metallurgy, can solve the problems of low metal recovery rate of iron ore, iron ore cannot be mined and utilized, etc., and achieve the effect of improving resource utilization

Active Publication Date: 2019-09-10
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a kind of symbiotic refractory iron ore for the single magnetic separation process to deal with the problem that the metal recovery rate of the symbiotic refractory iron ore is low, and the mine of the refractory iron ore is short of water, so that the iron ore cannot be mined and utilized. On-line closed-circuit magnetization roasting dry grinding dry separation process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] In this embodiment, the symbiotic refractory iron ore comes from Sidaogou Iron Mine in Gansu, with an iron grade of 32%, of which magnetite accounts for 15%, and hematite, siderite and limonite account for 85%. Follow the steps below To process:

[0018] A. Dry grind the above-mentioned symbiotic refractory iron ore to -0.3mm, and use a spiral dry magnetic separator with a field strength of 1500 Oe to carry out the separation and pre-selection of magnetite, hematite, siderite, and limonite. The pre-selected concentrate is magnetite, and the pre-selected tailings are mixed tailings containing hematite, siderite, limonite and surrounding rocks. After pre-selection, the grade of magnetite is 35% and the yield is 50%, and the grade of mixed tailings after pre-selection is 29% and the yield is 50%;

[0019] B. Carry out dry-type fine grinding of magnetite, grinding to -0.074mm, accounting for 75%, using flat wind-magnetic combined dry-type separator to carry out three-stage...

Embodiment 2

[0022] In this embodiment, the symbiotic refractory iron ore comes from Erdaogou Iron Mine in Gansu, with an iron grade of 30%, of which magnetite accounts for 16%, and hematite, siderite and limonite account for 84%. Follow the steps below To process:

[0023] A. Dry grind the above-mentioned symbiotic refractory iron ore to -0.3mm, and use a spiral dry magnetic separator with a field strength of 1800 Oe to carry out the separation and pre-selection of magnetite, hematite, siderite, and limonite. The pre-selected concentrate is magnetite, and the pre-selected tailings are mixed tailings containing hematite, siderite, limonite and surrounding rocks. After pre-selection, the grade of magnetite is 33% and the yield is 50%, and the grade of mixed tailings after pre-selection is 27% and the yield is 50%;

[0024] B. Carry out dry-type fine grinding of magnetite, grinding to -0.074mm, accounting for 75%, using flat wind-magnetic combined dry-type separator to carry out three-stage...

Embodiment 3

[0027] In this embodiment, the symbiotic refractory iron ore comes from Toudaogou Iron Mine in Gansu, with an iron grade of 33%, of which magnetite accounts for 20%, and hematite, siderite and limonite account for 80%. Follow the steps below To process:

[0028] A. Dry grind the above-mentioned symbiotic refractory iron ore to -0.3mm, and use a spiral dry magnetic separator with a field strength of 2000 Oe to carry out the separation and pre-selection of magnetite, hematite, siderite, and limonite. The pre-selected concentrate is magnetite, and the pre-selected tailings are mixed tailings containing hematite, siderite, limonite and surrounding rocks. After pre-selection, the grade of magnetite is 36% and the yield is 50%, and the grade of mixed tailings after pre-selection is 30% and the yield is 50%;

[0029] B. Carry out dry-type fine grinding of magnetite, and grind to -0.074mm, accounting for 75%. Use flat wind-magnetic combined dry-type separator to perform three-stage s...

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Abstract

The invention discloses an online closed-loop magnetization roasting dry grinding and dry separation process for paragenetic hard-separation iron ores and belongs to the technical field of metallurgy. Firstly, the paragenetic hard-separation iron ores which are dry-grinded to -0.3 mm are subjected to weak magnetic parting pre-separation operation; then the magnetic iron ores are subjected to three-stage weak magnetic drying type concentration; mixed tailings containing hematite, siderite, limonite and surrounding rock are subjected to magnetization roasting; and finally, the roasted ores are subjected to drying type waste discarding, drying grinding and three-stage weak magnetic drying type concentration and combined with three-stage weak magnetic drying type concentrated concentrates, and iron concentrates with the grade being more than 62% are obtained; and the three-stage weak magnetic drying type concentrated concentrates and the waste-discarded tailings are combined into the final tailings with the grade being less than 9%, and the metal recovery rate reaches 80% or above. According to the process, the paragenetic hard-separation iron ores containing magnetite, the hematite, the siderite and the limonite can be subjected to magnetic separation treatment simultaneously on line, the resource utilization rate and the metal recovery rate are increased, and the iron ore resources of mines lack of water can be effectively utilized.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, in particular to an on-line closed-circuit magnetization roasting dry grinding and dry separation process of symbiotic refractory iron ore. Background technique [0002] my country's iron ore resources are rich in lean ore and less in magnetic ore. Magnetite, hematite, siderite, and limonite coexist in refractory iron ore, which accounts for more than 50% of the total iron ore reserves. For example, Qinghai Small Shalong Iron Mine, Gansu Sidaogou Iron Mine, etc. If the symbiotic refractory iron ore is processed by a single magnetic separation process, the metal recovery rate will only reach 50-60%, resulting in waste of resources, and the grade of iron concentrate obtained by strong magnetic separation is only about 50%, and the metal recovery rate About 70%, the tailings grade is as high as 18-20%, and there is a problem that the utilization rate of iron ore is low or unusable. Moreover, mos...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/02C22B1/00B02C23/08B03C1/02
Inventor 展仁礼王欣边立国郭忆雷鹏飞杏仲全
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD