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A method for removing heavy saponification wastewater and applying it to in-situ leaching of rare earth

A technology of in-situ leaching and heavy saponification, applied in the direction of improving process efficiency, etc., can solve problems such as increased water hardness, and achieve the effects of simple operation, cost reduction, and high rare earth leaching rate

Active Publication Date: 2021-02-05
贺州稀有稀土矿业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above deficiencies, the present invention discloses a method for removing heavy saponification wastewater and applying it to in-situ leaching of rare earths, recycling calcium saponification wastewater, solving the problem of increased water hardness in the environment caused by the discharge of calcium saponification wastewater, and at the same time realizing the effective utilization of waste resources. Utilize, reduce the cost of rare earth leaching production in situ

Method used

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  • A method for removing heavy saponification wastewater and applying it to in-situ leaching of rare earth

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Effect test

Embodiment 1

[0020] A method for removing heavy saponification wastewater and applying it to rare earth leaching in situ, comprising the steps of:

[0021] (1) Preparation of ore leaching agent: Remove the heavy saponification wastewater and add magnesium oxide under the stirring condition of 700r / min. When the mass ratio is 9:1, stop adding magnesium oxide, then continue stirring for 30min to obtain solution A; add hydrochloric acid to the solution A to adjust the pH value to 3.5, and then obtain the ore leaching agent; Calculated, the content of calcium element is 160g / L, and the pH value of the heavy saponification wastewater is 4;

[0022] (2) In-situ leaching: Inject the leaching agent obtained in step (1) into the liquid injection point, the liquid-solid ratio of the leaching agent to rare earth ore is 1000kg:0.8kg, when the concentration of REO in the leachate is lower than 0.1 When g / L, stop injecting ore leaching agent to liquid injection point, then inject top water to liquid in...

Embodiment 2

[0026] A method for removing heavy saponification wastewater and applying it to rare earth leaching in situ, comprising the steps of:

[0027] (1) Preparation of ore leaching agent: Remove the heavy saponification wastewater and add magnesium oxide under the stirring condition of 600r / min. When the mass ratio is 8:1, stop adding magnesium oxide, then continue to stir for 25min to obtain solution A; add hydrochloric acid to the solution A to adjust the pH value to 4, and then obtain the ore leaching agent; Calculated, the content of calcium element is 100g / L, and the pH value of the heavy saponification wastewater is 6;

[0028] (2) In-situ leaching: Inject the leaching agent obtained in step (1) into the liquid injection point, the liquid-solid ratio of the leaching agent to rare earth ore is 1000kg:1kg, when the concentration of REO in the leachate is lower than 0.1g When / L, stop injecting ore leaching agent to liquid injection point, then inject top water to liquid injecti...

Embodiment 3

[0032] A method for removing heavy saponification wastewater and applying it to rare earth leaching in situ, comprising the steps of:

[0033] (1) Preparation of ore leaching agent: Remove the heavy saponification wastewater and add magnesium oxide under the stirring condition of 800r / min. When the mass ratio is 10:1, stop adding magnesium oxide, then continue to stir for 20 minutes to obtain solution A; add hydrochloric acid to solution A to adjust the pH value to 3, and then obtain the ore leaching agent; Calculated, the content of calcium element is 120g / L, and the pH value of the heavy saponification waste water is 5;

[0034](2) In-situ leaching: Inject the leaching agent obtained in step (1) into the liquid injection point, the liquid-solid ratio of the leaching agent to rare earth ore is 1000kg:0.4kg, when the concentration of REO in the leachate is lower than 0.1 When g / L, stop injecting ore leaching agent to liquid injection point, then inject top water to liquid inj...

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Abstract

The invention discloses a method for applying heavy saponification wastewater to in-situ rare earth ore leaching, which comprises four steps of preparation of ore leaching agent, in-situ leaching, impurity removal of rare earth leaching solution and rare earth extraction. Magnesium is compounded to prepare a leaching agent, and then the rare earth leaching agent is used for in-situ leaching of rare earths. After the leaching solution is removed, an extraction agent is added for extraction, and after standing for clarification, a loaded organic phase containing rare earth ions and a raffinate aqueous phase are obtained. , and then back-extract the loaded organic phase containing rare earth ions with an equal volume of hydrochloric acid to obtain a mixed rare earth chloride solution, and then process the mixed rare earth chloride solution through conventional concentrated crystallization to obtain a mixed rare earth chloride product. The method of the invention recycles and utilizes the calcium saponification wastewater, solves the problem that the discharge of the calcium saponification wastewater causes the hardness of the water body in the environment to increase, realizes effective utilization of waste resources, and reduces the cost of in-situ rare earth leaching production.

Description

technical field [0001] The invention belongs to the technical field of saponification wastewater reuse, and in particular relates to a method for removing heavy saponification wastewater and applying it to rare earth leaching in situ. Background technique [0002] In-situ leaching, referred to as in-situ leaching, is to inject leachate into the ore layer through the liquid injection hole under the natural ore output condition. The leachate selectively leaches the useful components in the ore, and the soluble compounds formed enter the leachate flow. A mining technique in which holes are raised to the surface for processing to extract metals. Compared with conventional mining and smelting methods, in-situ leaching mainly has the advantages of less infrastructure investment, short construction period, low production cost, good environmental protection, basically no damage to farmland and forests, and no environmental pollution. The in-situ leaching method is very suitable for...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/10C22B3/38C22B59/00
CPCC22B3/10C22B59/00C22B3/3844C22B3/3846C22B3/408Y02P10/20
Inventor 胡振光郭怀兵张新光韦世强谭海翔甘培原姚骥庄秀梅陈硕
Owner 贺州稀有稀土矿业有限公司