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A method for low-concentration hydrochloric acid leaching of calcium and strontium chemical separation of Weishan Lake rare earth concentrate

A rare earth concentrate, low concentration technology, applied in the direction of improving process efficiency, can solve the problems of serious three waste pollution, long process flow, low rare earth yield, etc. Effect

Active Publication Date: 2019-10-11
中稀(寿光)资源科技有限公司
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  • Application Information

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Problems solved by technology

[0003] The existing 40% grade Weishan Lake rare earth concentrate treatment process has the problems of long process flow, low rare earth yield and serious waste pollution, and is no longer suitable for the development of technology in this field

Method used

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  • A method for low-concentration hydrochloric acid leaching of calcium and strontium chemical separation of Weishan Lake rare earth concentrate
  • A method for low-concentration hydrochloric acid leaching of calcium and strontium chemical separation of Weishan Lake rare earth concentrate
  • A method for low-concentration hydrochloric acid leaching of calcium and strontium chemical separation of Weishan Lake rare earth concentrate

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Embodiment 1

[0029] Example 1 A method for leaching calcium and strontium chemical separation of Weishan Lake rare earth concentrate with low-concentration hydrochloric acid

[0030] The grade of Weishan Lake rare earth concentrate used as raw material is lower than 40%.

[0031] 1. Measure 11.8m³ of hydrochloric acid, inject it into the reaction tank, the concentration of hydrochloric acid (equivalent concentration) is 2.6N, put in 3.73t Weishan Lake rare earth concentrate, raise the temperature to 90°C and stir for 2 hours. At this time, the concentration of rare earth will not change. to terminate the reaction.

[0032] Filtrate to obtain the filtrate, which is injected into another tank as a primary acid bubble liquid, with a total of 14.2m³;

[0033] Filter to obtain 2.2t of filter residue, said filter residue: the moisture content is 15.90%, the rare earth oxide content is 50.81%; it is the target solid phase.

[0034] The content of ingredients in the primary acid bubble solution:...

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Abstract

The invention provides a method for selecting Weishan Lake rare earth concentrate by leaching calcium strontium with low concentration hydrochloric acid, which is characterized in that: the Weishan Lake rare earth concentrate is soaked in low concentration hydrochloric acid and heated to react. After the reaction is completed, it is filtered, and the Weishan Lake rare earth concentrate is added again to the filtered leachate, and heated to react. The liquid obtained after solid-liquid separation is discharged, and the solid phase is reused. The invention can increase the grade of the Weishan Lake rare earth concentrate from 40% to 50%, efficiently leaching 90% calcium carbonate and 85% strontium carbonate in the Weishan Lake rare earth concentrate, and ensures that the rare earth loss rate is less than 1%. The discharged acid leaching waste liquid only contains calcium chloride, strontium chloride and a small amount of ferric chloride, which is easy for wastewater treatment.

Description

technical field [0001] The invention relates to a low-concentration hydrochloric acid leaching method for calcium-strontium chemical separation of Weishan Lake rare earth concentrate, belonging to the technical field of rare earth hydrometallurgy. Background technique [0002] Weishan Lake Rare Earth Mine is a famous light rare earth deposit in my country, and it is one of the three major light rare earth mines in my country together with Baotou Mine and Sichuan Mine. As the raw material base of Shandong rare earth smelting and separation production line, Weishan Lake rare earth mine has the characteristics of large rare earth reserves and many impurity minerals, which make it difficult to smelt. [0003] The existing 40% grade Weishan Lake rare earth concentrate treatment process has the problems of long process flow, low rare earth yield, and serious waste pollution, and is no longer suitable for the development of technology in this field. Contents of the invention [...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/10C22B59/00C22B26/20
CPCC22B3/10C22B26/20C22B59/00Y02P10/20
Inventor 胡德志李常清郑理杰孙国璐
Owner 中稀(寿光)资源科技有限公司
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