Method for recovering iron from rare-earth tailings and producing high-grade fine iron powder

A technology of rare earth tailings and iron recovery, which is applied in the field of comprehensive utilization of resources and mineral processing, can solve the problems of complex composition of rare earth tailings, low grade of useful minerals, and low recovery rate of valuable elements, so as to improve the grade and recovery rate, Inexpensive, wide-ranging effects

Inactive Publication Date: 2013-01-16
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

[0004] At present, some domestic scholars and scientific research institutes have studied the recovery of iron, rare earth and niobium from rare earth tailings, and achieved certain results. However, due to th

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  • Method for recovering iron from rare-earth tailings and producing high-grade fine iron powder

Examples

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Effect test

example 1

[0021] Example 1 : The rare earth tailings in this example come from the tailings after flotation recovery of rare earth in a concentrator in Inner Mongolia. The total iron content is 19.73%. The iron minerals are mainly hematite. Stone, iron dolomite, cordierite and phlogopite are the main ones, and the ore particle size can reach -200 mesh 66.95%.

[0022] According to the properties of minerals, the process of recovering iron and producing high-grade iron concentrate powder is as follows: finely grind the rare earth tailings to -325 mesh 80%, then enter the strong magnetic separator (magnetic field strength 11000Oe), obtain a grade of 25.75%, and a recovery rate of 86.22% Iron coarse concentrate; Gained iron coarse concentrate is mixed with carbon-containing reducing agent, and the amount of carbon-containing reducing agent is 10%, 5% flux, and the surface of the mixed mixture is added according to the total mass percentage of strong magnetic concentrate is 10% % carbon-c...

example 2

[0023] Example 2: The rare earth tailings in this example come from the tailings after flotation and recovery of rare earth in a concentrator in the south. The total iron content is 21.34%. The iron minerals are mainly hematite and limonite. The gangue minerals are rare earth, quartz, Mainly fluorite, barite, phlogopite, calcite and sodium amphibole, the ore particle size can reach -200 mesh 69.78%.

[0024] According to the nature of minerals, the process of recovering iron and producing high-grade iron concentrate powder is as follows: finely grind the rare earth tailings to -325 mesh 75%, then enter the strong magnetic separator (magnetic field strength 12000Oe), obtain a grade of 28.35%, and a recovery rate of 85.48% The iron coarse concentrate; The obtained iron coarse concentrate is mixed with carbon-containing reducing agent, and the amount of carbon-containing reducing agent is 20%, 3% flux, and the surface of the mixed mixture is added according to the total mass per...

Embodiment 3

[0026] Finely grind a rare earth tailings to -325 mesh 75% and then enter a strong magnetic separator (magnetic field strength 7000Oe) to obtain iron coarse concentrate with a grade of 25.35% and a recovery rate of 88.40%; the obtained iron coarse concentrate is mixed with a carbon-containing reducing agent , the amount of carbon-containing reducing agent is 40%, 4.5% of flux, and the surface of the evenly mixed mixture is added with a carbon-containing reducing agent of 12.5% ​​according to the total mass percentage of the strong magnetic concentrate to ensure a reducing atmosphere. The mixture is directly reduced and roasted : The roasting temperature is 1300°C and the roasting time is 120 minutes; the roasted ore is naturally cooled and then sent to the rod mill for grinding. The rod mill is 20 minutes, and the grinding particle size is -200 mesh, accounting for 85%; The magnetic separator performs weak magnetic separation (magnetic field strength 1600Oe) to obtain high-grad...

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Abstract

The invention discloses a method for recovering iron from rare-earth tailings and producing high-grade fine iron powder. Iron minerals are efficiently recovered from rare-earth tailings and high-grade fine iron powder is produced by a strongly magnetic pre-enrichment-iron rough concentrate reduction roasting-low-intensity magnetic separation method. The method is characterized by comprising the following steps of: performing rod milling of the rare-earth tailings, pre-enriching by a high-gradient high-intensity magnetic separator, recovering valuable ingredients such as rare earth and niobium from obtained tailings of high-intensity magnetic separation by methods such as a flotation method, and uniformly mixing an obtained iron rough concentrate and a carbon-containing reducing agent in a certain proportion for reduction roasting; and performing rod milling of a roasted product, and thus obtaining an iron rough concentrate with the grade of more than 90 percent and the recovery rate of more than 90 percent by a low-intensity magnetic separation method. According to the method, the iron minerals in the rare-earth tailings are pre-enriched by the high-gradient high-intensity magnetic separator, so that the tailings of high-intensity magnetic separation are further recycled; and the coupling relation between a deep reduction-low-intensity magnetic separation iron recovery process method and the recovery of other valuable components is determined.

Description

technical field [0001] The invention relates to a method for efficiently recovering iron from rare earth tailings based on a coupling relationship, and belongs to the fields of resource comprehensive utilization and mineral processing. Background technique [0002] Mineral resources are important resources for human beings to survive. They are non-renewable and irreplaceable, and they are the foundation of my country's industrial development. With the rapid development of my country's economy, the contradiction of resource shortage is becoming more and more prominent, and the environmental pressure is increasing. Vigorously developing circular economy and improving resource utilization is an inevitable way to solve the current resource and environmental constraints on economic development in our country. As the largest amount of solid waste among the three industrial wastes, tailings should be developed and utilized through multiple channels, and the recovery of valuable met...

Claims

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Application Information

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IPC IPC(8): C22B1/00C22B1/02B03C1/025
Inventor 林海许晓芳董颖博张文通周闪闪
Owner UNIV OF SCI & TECH BEIJING
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