CN114289177A - Method for stably producing high-grade rare earth concentrate by using strong magnetic machine - Google Patents
Method for stably producing high-grade rare earth concentrate by using strong magnetic machine Download PDFInfo
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- CN114289177A CN114289177A CN202111587923.8A CN202111587923A CN114289177A CN 114289177 A CN114289177 A CN 114289177A CN 202111587923 A CN202111587923 A CN 202111587923A CN 114289177 A CN114289177 A CN 114289177A
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Abstract
The invention discloses a method for stably producing high-grade rare earth concentrate by using a strong magnetic machine, which comprises the following steps: the rare earth concentrate with the grade of more than 50 percent of rare earth concentrate obtained by adopting a primary-roughing and secondary-refining method in actual production is sent into a cylindrical sieve by using a concentrate pump to clear large impurities in the rare earth concentrate, and then the rare earth concentrate enters a 1.7T strong magnetic machine by using height difference gravity flow, so that more than 60 percent of rare earth concentrate can be stably output. According to the invention, the grade of the rare earth concentrate with the grade of about 50% can be stably improved to more than 60% through the 1.7T strong magnetic machine, so that the grade of the rare earth flotation concentrate can be controlled to about 50%, thus the grade of the rare earth flotation can be improved, and a part of medicament (shown in table one) can be saved, thereby reducing the production cost of the rare earth concentrate.
Description
Technical Field
The invention relates to the field of magnetic separation, in particular to a method for stably producing high-grade rare earth concentrate by using a strong magnetic separator.
Background
Rare earth elements are called industrial monosodium glutamate which is a high-tech and functional material in the new century, and are strategic resources for developing high and new technologies in the 21 st century. The method is widely applied to high-precision fields such as electronics, energy, laser, nuclear industry, superconduction and the like, and relates to aspects of national production.
As a main mining base of the light rare earth in China, Baiyunebo is a rare and ultra-large ore deposit formed by symbiosis of various mineral resources such as iron, rare earth, fluorite, niobium, scandium and the like in the world, the storage capacity of rare earth oxide is about 1 hundred million tons, and the industrial storage capacity is 4300 million tons.
At present, the average grade of rare earth of bayan obo ore is 4% -6%, iron ore concentrate is recycled by adopting a magnetic separation method, then rare earth ore concentrate is recycled by adopting a flotation method, and the grade of the rare earth ore concentrate is difficult to stably reach more than 60%.
The magnetic moment of the rare earth is determined by the rare earth 4f electron layer, so that the rare earth has certain weak magnetism in the state of oxide, the field intensity of the existing strong magnetic separator can reach 1.7T or even stronger, and the basic requirement of rare earth magnetic separation is met.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a method for stably producing high-grade rare earth concentrate by using a strong magnetic machine, so that the grade of the rare earth concentrate can be stabilized to be more than 60% in production.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention relates to a method for stably producing high-grade rare earth concentrate by using a strong magnetic machine, which comprises the following steps: the rare earth concentrate with the grade of more than 50 percent of rare earth concentrate obtained by adopting a primary-roughing and secondary-refining method in actual production is sent into a cylindrical sieve by using a concentrate pump to clear large impurities in the rare earth concentrate, and then the rare earth concentrate enters a 1.7T strong magnetic machine by using height difference gravity flow, so that more than 60 percent of rare earth concentrate can be stably output.
Further, the flotation concentrate had an average particle size of 97.84% at-200 mesh and an average concentration of 29.79%.
Furthermore, the grade of the rare earth flotation concentrate is about 50%.
Compared with the prior art, the invention has the beneficial technical effects that:
aiming at the problems that the grade of rare earth concentrate is difficult to be improved to more than 60 percent by a flotation method in the existing rare earth concentrate production process, and the invention provides a method for separating rare earth and nonmagnetic impurities by a strong magnetic machine in order to ensure stable output of the grade and improve the grade of the rare earth concentrate, which can effectively improve the grade of the rare earth concentrate and save flotation reagents.
Drawings
The invention is further illustrated in the following description with reference to the drawings.
FIG. 1 is a schematic process flow diagram of the method for stably producing high-grade rare earth concentrate by using a strong magnetic machine.
Detailed Description
As shown in fig. 1, a method for stably producing high-grade rare earth concentrate by using a strong magnetic machine comprises the following steps: the rare earth concentrate with the grade of more than 50 percent of rare earth concentrate obtained by adopting a primary-roughing and secondary-refining method in actual production is sent into a cylindrical sieve by using a concentrate pump to clear large impurities in the rare earth concentrate, and then the rare earth concentrate enters a 1.7T strong magnetic machine by using height difference gravity flow, so that more than 60 percent of rare earth concentrate can be stably output.
Sending the flotation concentrate into a 1.7T strong magnetic machine for strong magnetic experiment, carrying out 29 shifts in total in the experiment, and finding through experiment index comparison:
the average particle size of flotation concentrate-200 meshes is 97.84%, the average concentration is 29.79%, and the flotation method meets the sorting conditions of a strong magnetic machine.
Secondly, the rare earth concentrate is re-selected by a strong magnetic machine, the concentrate grade can be well promoted, and is promoted from 52.55% to 61.10% on average and is promoted by 8.55%.
Thirdly, rare earth concentrate is re-selected by a strong magnetic machine, the tailings and the medium ore level are higher, the average grade of the tailings is 47.97 percent, and is reduced by 4.58 percent compared with 52.55 percent of the raw ore; the average grade of the middlings is 56.22%, which is 3.67% higher than that of the raw ores 52.55%.
Fourthly, flotation concentrate is larger than 53 percent and accounts for 8 shifts, and indexes of the strong magnetic separator are as follows: the average raw ore grade is 56.45%, the average concentrate grade is 62.73%, the average tailing grade is 53.85%, the average middling grade is 60.00%, the belt concentrate grade is 58.69%, and the yield is 139.93 t; the flotation concentrate is less than 53 percent, and the indexes of the strong magnetic separator are as follows: the average raw ore grade is 51.06%, the average concentrate grade is 60.48%, the average tailing grade is 45.73%, the average middling grade is 54.73%, the belt concentrate grade is 60.11%, and the yield is 244.19 t.
Fifthly, after the flotation concentrate passes through the strong magnetism, the problem of large grade difference before and after filtration basically disappears, which shows that a large part of argillized nonmagnetic impurities are discharged after the concentrate passes through the strong magnetism.
The grade of the rare earth concentrate with the grade of about 50 percent can be stably improved to more than 60 percent through the 1.7T strong magnetic machine, so that the grade of the rare earth flotation concentrate can be controlled to about 50 percent, the grade of the rare earth flotation can be improved, and a part of medicament (shown in table one) can be saved, thereby reducing the production cost of the rare earth concentrate.
TABLE-average unit consumption of rare-earth ore concentrate
| Raw ore grade | Unit consumption of collector | |
| 58% rare earth concentrate | 8.5％ | 31.8kg/t |
| 50% rare earth concentrate | 8.5％ | 20kg/t |
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (3)
1. A method for stably producing high-grade rare earth concentrate by using a strong magnetic machine is characterized by comprising the following steps: the rare earth concentrate with the grade of more than 50% of rare earth flotation concentrate obtained by adopting a primary-roughing-secondary-refining method in actual production is sent into a cylindrical sieve by using a concentrate pump to clear large impurities in the rare earth concentrate, and then the rare earth concentrate enters a 1.7T strong magnetic machine by using height difference gravity flow, so that more than 60% of rare earth concentrate can be stably output.
2. The method of claim 1, wherein the flotation concentrate has an average particle size of 97.84% for a-200 mesh and an average concentration of 29.79%.
3. The method for stable production of high grade rare earth concentrate using strong magnet according to claim 1, wherein the rare earth flotation concentrate grade is 50%.
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| CN109133141A (en) * | 2018-09-18 | 2019-01-04 | 东北大学 | A kind of separation method of the bloodstone of bastnaesite reduction association Rare Earth Mine |
| CN110813522A (en) * | 2019-11-01 | 2020-02-21 | 四川江铜稀土有限责任公司 | Method for improving quality of flotation rare earth concentrate and mineral separation method of rare earth ore |
| CN110860369A (en) * | 2019-12-06 | 2020-03-06 | 四川江铜稀土有限责任公司 | Beneficiation method for recovering ultralow-grade rare earth and fluorite from rare earth tailings |
| CN111346742A (en) * | 2020-03-16 | 2020-06-30 | 江西理工大学 | Mineral separation method applying superconducting magnetic separation to rare earth ore |
| WO2021073162A1 (en) * | 2019-10-14 | 2021-04-22 | 广东省科学院资源综合利用研究所 | Method for intensive recovery of valuable components from rare earth tailings |
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- 2021-12-23 CN CN202111587923.8A patent/CN114289177A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104607312A (en) * | 2015-01-16 | 2015-05-13 | 乐山盛和稀土股份有限公司 | Bastnaesite beneficiation process |
| CN106799300A (en) * | 2016-12-15 | 2017-06-06 | 江苏旌凯中科超导高技术有限公司 | A kind of beneficiation method of Rare Earth Mine |
| CN107282288A (en) * | 2017-05-26 | 2017-10-24 | 内蒙古科技大学 | A kind of beneficiation method of synthetical recovery weak magnetism, rare earth and fluorite |
| CN108034964A (en) * | 2017-12-20 | 2018-05-15 | 宁波市鄞州智伴信息科技有限公司 | A kind of technique for being separated from Rare Earth Mine and extracting phosphorus yttrium element |
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| CN110860369A (en) * | 2019-12-06 | 2020-03-06 | 四川江铜稀土有限责任公司 | Beneficiation method for recovering ultralow-grade rare earth and fluorite from rare earth tailings |
| CN111346742A (en) * | 2020-03-16 | 2020-06-30 | 江西理工大学 | Mineral separation method applying superconducting magnetic separation to rare earth ore |
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