Extraction technology of ion-absorbed rare earth mine

An ionic rare earth ore and extraction process technology, applied in the direction of improving process efficiency, can solve the problems of waste, large volume of impurity removal tank, sedimentation tank, large volume of leachate, etc., and achieve the effect of improving recovery rate

Inactive Publication Date: 2015-11-04
SHANGHAI KAIXIN ISOLATION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Due to the low grade of the ore, the concentration of rare earth in the leachate obtained is very low, and the volume of the leachate is huge. At the same time, the total time for impurity removal and sedimentation is as long as 10 hours, resulting in a large volume of the impurity removal tank and the sedimentation tank
Due to the short mining period of the mine, the infrastructure facilities such as impurity removal ponds and sedimentation ponds are left idle after the stop of mining, causing huge waste and causing huge permanent damage to the mountain environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Take 1 ton of leaching solution from an ionic rare earth mine, in which the rare earth content (in terms of rare earth oxide content) is about 200 mg / L, and the turbidity is about 100 NTU. The raw liquid enters the quartz sand filter, and the permeate is pumped into the nanofiltration membrane system through a pump. The membrane pressure is controlled at 1.5-2.5Mpa, and the operating temperature is 10-40°C to obtain 80-85kg of nanofiltration membrane concentrate, and its rare earth concentration is 2400-2500mg / L. The rare earth recovery rate reaches 99.5%. Add saturated ammonium bicarbonate solution to the concentrated solution, adjust the pH to 5.2-5.4, and then enter the first-stage centrifuge device after reaction, and then enter the adjustment tank, add saturated ammonium bicarbonate solution to it until the rare earth precipitation is complete , after standing still for 3-4 hours, through the secondary centrifuge device, the precipitate is carbonic acid mixed rare...

Embodiment 2

[0027] Take 2 tons of leachate from a certain ionic rare earth mine, in which the rare earth content (in terms of rare earth oxide content) is 512 mg / L, and the turbidity is 111 NTU. The stock solution enters the submerged microfiltration device. Under the action of the vacuum pump, the filtrate permeates the membrane, puts it in the storage tank, and pumps it into the nanofiltration membrane device through the pump. The membrane pressure is controlled at 3.0Mpa, the operating temperature is 10-40°C, and the filtrate volume of the nanofiltration membrane is 1834kg. , the concentration of ammonium sulfate is 1100mg / L, the volume of nanofiltration membrane concentrate is 165kg, the concentration of rare earth is 6161mg / L, and the recovery rate of rare earth reaches 99.3%. Add saturated ammonium bicarbonate solution to the concentrated solution, adjust the pH to 5.2~5.4, enter the first-stage centrifuge device after reaction, and then enter the adjustment tank, add saturated oxal...

Embodiment 3

[0029] Take 4 tons of leachate from an ionic rare earth mine, in which the rare earth content (in terms of rare earth oxide content) is 156 mg / L, and the turbidity is 98 NTU. The raw liquid enters the submerged ultrafiltration device. Under the action of the pressure pump, the filtrate permeates the membrane, puts it in the storage tank, and pumps it into the nanofiltration membrane device through the pump. The membrane pressure is controlled at 2.8Mpa, the operating temperature is 10-40°C, and the filtrate volume of the nanofiltration membrane is 3842kg, the volume of nanofiltration membrane concentrate is 157kg, the concentration of rare earth is 3942mg / L, and the recovery rate of rare earth reaches 99.5%. Add saturated ammonium bicarbonate solution to the concentrated solution to adjust the pH to 5.2-5.4. After the reaction, enter the first-stage centrifuge device, and then the centrifugate enters the adjustment tank, and add saturated ammonium bicarbonate solution to it un...

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Abstract

An extraction technology of ion-absorbed rare earth mine is disclosed. RE leach liquor undergoes preliminary filtration and the filtered RE leach liquor enters a nanofiltration membrane system; a nanofiltration membrane concentrated solution is introduced into an impurity removal tank or an impurity removal pot; a saturated ammonium bicarbonate solution or ammoniacal liquor is added for sedimentation; and a rare earth precipitating agent is added into a clear liquid so as to obtain a precipitate which is a mixed rare earth product. The above precipitating agent is a saturated ammonium bicarbonate solution or saturated oxalic acid solution. By the technology provided by the invention, rare earth is extracted by the combination of a membrane separation technology and a centrifugal separation technology. Dosage of ammonium bicarbonate is decreased, volume of various tanks is reduced, recycling of ammonium sulfate is realized, extraction rate of rare earth is raised, and economical exploitation of rare earth mine with content of rare earth in a leachate being less than 0.2 g/L can be achieved. Meanwhile, the production technology adopts an integrated equipment system, there is no need to excavate lots of tanks or destroy mountain vegetation, and damage of traditional production technologies to the environment is changed thoroughly. The extraction technology provided by the invention is a typical clean production technology.

Description

technical field [0001] The invention relates to a beneficiation process, in particular to an extraction process of ion-type rare earth ore. Background technique [0002] Ionic rare earth deposits (also known as weathering crust leaching rare earth deposits) are a new type of rare earth deposits discovered for the first time in my country. This deposit is large in scale, rich in reserves, and low in radioactivity. It is a unique rare earth resource in my country, mainly distributed in Jiangxi , Guangdong, Hunan, Fujian, Guangxi and other provinces and autonomous regions. Its characteristic is that it is mainly adsorbed on the surface of clay minerals in the form of ions, which is easy to mine and simple in extraction process. However, the grade of this type of ore is low, mostly below 3 per thousand. As the mining of rare earth mines becomes more and more lean and mineralized, the extraction cost gradually increases. [0003] The traditional rare earth extraction process of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B59/00C22B3/22C22B3/44
CPCY02P10/20
Inventor 葛文越肖礼金曹厚康
Owner SHANGHAI KAIXIN ISOLATION TECH CO LTD
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