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Method for reutilization of wastewater of process of producing rare earth chloride by extraction and transformation of sulfuric acid system

A technology of rare earth chloride and rare earth sulfate, applied in chemical instruments and methods, extraction water/sewage treatment, natural water treatment, etc., can solve problems such as high cost, affect water environment quality, increase pollutant discharge, etc., and achieve improvement Concentration, protection of water resources and environment, and the effect of avoiding the discharge of ammonia nitrogen pollutants

Inactive Publication Date: 2012-07-04
包头市红天宇稀土磁材有限公司
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  • Application Information

AI Technical Summary

Problems solved by technology

A large amount of industrial wastewater containing ammonia and nitrogen is discharged, which increases the discharge of pollutants and affects the quality of the water environment
Treatment of ammonia nitrogen-containing wastewater is not only costly, but it is still difficult to fully meet the discharge standards

Method used

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  • Method for reutilization of wastewater of process of producing rare earth chloride by extraction and transformation of sulfuric acid system
  • Method for reutilization of wastewater of process of producing rare earth chloride by extraction and transformation of sulfuric acid system

Examples

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Effect test

Embodiment 1

[0026] After leaching 30g of roasted ore with water, filter to obtain rare earth sulfate leaching solution, dilute with water to obtain rare earth sulfate solution with rare earth concentration of 19g / l, Cao1.3g / l, Mgo0.176g / l, pH 4.5.

[0027] Rare earth sulfate solution, use 1.5mol non-saponifiable P204 for extraction transformation, 4 stages of extraction, 4 stages of stripping, the ratio (organic phase: solid liquid: stripping) is 1:1:0.3, and the stripping acid is 6N hydrochloric acid. A mixed rare earth chloride product is obtained.

[0028] The raffinate is neutralized with calcium oxide to pH ~ 4.5, and after filtration, calcium sulfate by-product and reclaimed water are obtained. Recycled water is returned for leaching of roasted ore or washing water for water leaching slag.

[0029] After repeated recycling of reclaimed water for leaching of roasted ore and washing water for leaching slag for 6 times, the rare earth leaching rate is still 97% to 98%, and the Cao in ...

Embodiment 2

[0031] Take 700Kg of roasted ore, leach with water and then filter to obtain rare earth sulfate leaching solution.

[0032] The sulfuric acid rare earth leaching solution is diluted with reclaimed water to obtain a rare earth sulfuric acid solution for extraction transformation with a rare earth concentration of 17-22g / l, Cao1.36-1.95g / l, Mgo: 0.49-1.09g / l, and pH~4.5 .

[0033] Rare earth sulfate solution is extracted and transformed with 1.5mol non-saponifiable P204 extractant, 6 stages of extraction, 3 stages of washing, 1 stage of sedimentation, 16 stages of back extraction, 1 stage of sedimentation, 3 stages of water washing, the flow ratio is, organic phase: material Liquid: Washing liquid: Stripping liquid: Washing water = 9~10: 10.6~8.2: 0.3~0.4: 0.5~0.55: 0.1~0.12L / min. The washing solution is 0.22mol / l hydrochloric acid or 0.12mol / l sulfuric acid, and the stripping solution is 6.3-6.5mol / l hydrochloric acid.

[0034] Loaded organics are back-extracted with hydrochl...

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Abstract

The invention relates to a method for reutilization of wastewater of a process of producing rare earth chloride by extraction and transformation of a sulfuric acid system, which contains extraction raffinate obtained by adopting a non-saponified extractant for carrying out the extraction and the transformation on rare earth sulfate solution, and the recovery steps of the extraction raffinate comprises the following steps: adding a neutralizer which is well prepared in advance in the extraction raffinate at normal temperature, neutralizing till the pH is 3.5-6.5, aging for 6-8h after the pH value is stable, filtering and finally obtaining reclaimed water for reuse. The method realizes the reutilization of the wastewater of the process of producing the rare earth chloride and the zero discharge of the wastewater of the process. The process can avoid the discharge of ammonia nitrogen wastewater, protect the water resource environment and save a large quantity of precious water resources.Furthermore, the method can lead enterprises to become clean, recycling and environment-friendly enterprises.

Description

Technical field: [0001] The invention relates to a method for reusing waste water from a sulfuric acid system extraction transformation process to produce rare earth chloride, which belongs to the waste water reutilization technology in the technical field of industrial environmental protection. Background technique: [0002] At present, the production of mixed rare earth chlorides in Baotou rare earth concentrates uses high-temperature concentrated sulfuric acid roasting, leaching with water to obtain rare earth sulfate immersion solutions, and ammonium bicarbonate precipitation to produce rare earth carbonates. [0003] The main problem of this process method is that the water consumption is large, and a large amount of industrial waste water containing ammonia nitrogen is produced. A large amount of industrial wastewater containing ammonia and nitrogen is discharged, which increases the discharge of pollutants and affects the quality of the water environment. Treatment o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F1/66C02F1/26C02F103/34
Inventor 袁哲儒朴钟殷邹宁王国营萧昱
Owner 包头市红天宇稀土磁材有限公司