Method for treating wastewater after ore leaching and ore closing of ionic rare earth ore

An ionic rare earth ore and wastewater treatment technology, which is applied in metallurgical wastewater treatment, water/sewage treatment, water/sludge/sewage treatment, etc. It can solve the problems of large amount of wastewater, waste of resources, hidden danger of pollution, etc. , to achieve the effect of recycling, low environmental impact

Inactive Publication Date: 2021-03-09
LONGNAN COUNTY NANYU RARE EARTH RESOURCES COMPREHENSIVE UTILIZATION CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this kind of leaching aid is quite different from the leaching agent used, and the influence on the pH and salinity of the ore body is not clear, which brings new pollution risks to the surrounding environment of the ore body and the groundwater system.
[0005] After the mine is closed, the amount of wastewater remaining in the mine is large, mainly from the recovered ore leaching tailings, impurity removal and sedimentation wastewater, etc. The content of valuable elements is low, and the cost of treatment and recovery is high. It is often discharged directly into the surrounding environment without treatment. middle
The high content of salt in the wastewater causes acidification and compaction of the soil in the rare earth mining area and the surrounding soil, and the cost of ecological restoration is high
Wastewater also contains low concentrations of calcium salts, aluminum salts, etc., direct discharge causes waste of resources, and the waste water contains a small amount of heavy metals such as lead, zinc, copper, etc., which is difficult to treat. If the discharge is not treated, it will also cause heavy metal elements in the surrounding environment. exceed the standard

Method used

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  • Method for treating wastewater after ore leaching and ore closing of ionic rare earth ore
  • Method for treating wastewater after ore leaching and ore closing of ionic rare earth ore
  • Method for treating wastewater after ore leaching and ore closing of ionic rare earth ore

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Embodiment 1

[0017] This embodiment provides a method for treating wastewater after leaching and closure of ionic rare earth ore, comprising the following steps:

[0018] (1) With the precipitation supernatant produced in the leaching process as raw material, a total of 0.85L, the concentrations of rare earth ions, chloride ions, calcium ions, aluminum ions and other non-rare earth ions and heavy metal ions in the wastewater are measured as shown in Table 1. Show.

[0019] (2) Add 78g of lime and 32g of sodium metaaluminate to the waste water until Ca in the waste water 2+ :Al 3+ :Cl - The mass ratio is 12: 2: 1, stirring and reacting, filtering; the concentration of rare earth ions, chloride ions, calcium ions, aluminum ions and other non-rare earth ions and heavy metal ions in the filtrate is as shown in Table 1. In the waste water, Ca, The contents of Mg and Cl ions are greatly reduced, and the contents of heavy metal ions such as Zn, Cd, Pb, Cu, As, Cr, and Mn are all <0.05mg / L, mee...

Embodiment 2

[0024] This embodiment provides a method for treating wastewater after leaching and closure of ionic rare earth ore, comprising the following steps:

[0025] (1) Using the comprehensive wastewater mixed with the leaching tailing liquid, precipitation supernatant, and product washing liquid produced in the leaching process as raw material, a total of 1.5L, to measure the concentration of rare earth ions, chloride ions, calcium ions, and aluminum ions in the wastewater And the concentrations of other non-rare earth ions and heavy metal ions are shown in Table 2.

[0026] (2) Add 54.5g of lime and 21g of sodium metaaluminate to the wastewater until Ca in the wastewater 2+ :Al 3+ :Cl - The mass ratio is 9: 1.5: 1, stirring and reacting, filtering; the concentration of rare earth ions, chloride ions, calcium ions, aluminum ions and other non-rare earth ions and heavy metal ions in the filtrate is as shown in Table 2. In the waste water, Ca, The contents of Mg and Cl ions are gre...

Embodiment 3

[0031] This embodiment provides a method for treating wastewater after leaching and closure of ionic rare earth ore, comprising the following steps:

[0032] (1) With the precipitated supernatant produced in the ore leaching process as raw material, a total of 0.8L, the concentrations of rare earth ions, chloride ions, calcium ions, aluminum ions and other non-rare earth ions and heavy metal ions in the wastewater are measured as shown in Table 3. Show.

[0033] (2) Add 57g of lime and 28g of sodium metaaluminate to the wastewater until Ca in the wastewater 2+ :Al 3+ :Cl - The mass ratio is 10: 2: 1, stirring and reacting, filtering; the filtrate measures the concentration of rare earth ion, chloride ion, calcium ion, aluminum ion concentration and other non-rare earth ion and heavy metal ion concentration as shown in table 3, in the waste water, Ca, The contents of Mg and Cl ions are greatly reduced, and the contents of heavy metal ions such as Zn, Cd, Pb, Cu, As, Cr, and ...

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Abstract

The invention discloses a method for treating wastewater after ore leaching and ore closing of ionic rare earth ores. The method comprises the following steps: S1, taking ore leaching tail liquid, precipitation supernatant and product water washing liquid generated in an ore leaching process of ionic rare earth ores as raw materials, and determining the concentrations of rare earth ions, chlorineions, calcium ions and aluminum ions and the concentrations of other non-rare earth ions and heavy metal ions in the wastewater; S2, adding lime and sodium metaaluminate into the wastewater until themass ratio of Ca<2+> to Al<3+> to Cl<-> in the wastewater is (9-12):(1.5-2):1, stirring for reaction, and filtering; and S3, filtering to obtain a Fremys salt precipitate, and decomposing with hydrochloric acid to obtain a solution containing calcium chloride and aluminum chloride. According to the method, calcium salt, aluminum salt and chlorine ions in closed ore waste water are converted into Fremys salts to achieve recycling of an ore leaching agent while the content of the chlorine ions and the content of heavy metal Zn, Cd, Pb, Cu, As, Cr and Mn in the wastewater are reduced to achieve the harmless discharge of the wastewater, and the mining area environment influence after ore closing is small, so that efficient and environment-friendly extraction of ionic rare earth can be achieved.

Description

technical field [0001] The invention relates to the technical field of rare earth hydrometallurgy, in particular to a method for treating ionic rare earth ore leaching wastewater after mine closure. Background technique [0002] The rare earth in the ionic rare earth ore is adsorbed on the surface of the clay mineral in an ionic state, and the rare earth ions can be exchanged with a strong electrolyte. Therefore, according to the characteristics of the ionic rare earth ore, my country has invented an ionic rare earth extraction process. The extraction process has successively gone through the stages of sodium chloride pool leaching process, ammonium sulfate pool leaching process, ammonium sulfate heap leaching process, ammonium sulfate in-situ leaching process and magnesium sulfate leaching process, laying a solid foundation for the construction of an ionic rare earth industrial system in my country. foundation. The in-situ leaching technology of ammonium sulfate leaching-am...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C01F7/56C01F11/28C22B3/44C22B59/00C02F101/12C02F101/20C02F103/16
CPCC02F1/5236C22B3/44C22B59/00C01F11/28C01F7/56C02F2101/12C02F2101/20C02F2103/16Y02P10/20
Inventor 许瑞高刘聪牛飞庄雪涛何潇李星岚蔡志华邹桂添李纯徐星叶信宇钟化云何花金蓝桥发李早发杨幼明
Owner LONGNAN COUNTY NANYU RARE EARTH RESOURCES COMPREHENSIVE UTILIZATION CO LTD
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