Method for simultaneously treating waste water and recovering rare earth of rare earth separation plant

A waste water and rare earth technology, which is applied in the direction of neutralizing water/sewage treatment, improving process efficiency, etc., can solve the problems of rare earth separation plant waste water recovery of rare earth, ammonia nitrogen COD and other indicators are difficult to meet the discharge standards, high energy consumption and other problems , to achieve good economic benefits, reduce environmental pollution, and reduce production

Active Publication Date: 2011-02-23
江西明达功能材料有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The treatment process consumes a lot of energy, and the indicators such as ammonia nitrogen and COD in the wastewater are difficult to meet the discharge standards allowed by the state
[0010] After searching, there is no patent on treating wastewater from rare earth separation plants and recovering rare earths at the same time

Method used

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  • Method for simultaneously treating waste water and recovering rare earth of rare earth separation plant
  • Method for simultaneously treating waste water and recovering rare earth of rare earth separation plant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] see figure 1 , the C 草酸 =12.7g / L, REO=0.73g / L praseodymium neodymium oxalate precipitation wastewater 5m 3 Add calcium carbonate to react to pH = 1.5, filter the suspension and wash the filter residue to obtain an intermediate residue; the intermediate residue is burned at 850-900°C to obtain 43.1kg of mixed oxide. The mixed oxide and the C produced in the production of lanthanum carbonate 氯化铵 =75g / L, REO=0.86g / L ammonium bicarbonate precipitation filtrate 1m3 is reacted in the stirred tank to pH=9 and then filtered, and the filtrate is returned to the extraction line for the saponification of the organic extractant, and the filter residue is washed and leached with sulfuric acid to obtain the rare earth material liquid, return to production use. The total recovery of rare earths is equivalent to REO=4.1kg, and the recovery rate of rare earths is 90.9%.

Embodiment 2

[0044] see figure 1 , the C 草酸 =16.9g / L, REO=0.78g / L Dysprosium oxalate precipitation wastewater 5m 3 Add calcium carbonate and mix until pH=4, filter the suspension and wash the filter residue to obtain an intermediate residue; the intermediate residue is burned at 950-1000°C to obtain 56.2kg of mixed oxide. The mixed oxide and the C produced in the extraction line 氯化铵 = 100g / L extraction saponification waste water 1m 3 After reacting in the stirred tank to pH=8, filter, return the filtrate to the extraction line for saponification of the organic extractant, wash the filtered filter residue and leaching with acetic acid to obtain a rare earth material liquid, which is returned to production for use. The total recovery of rare earths is equivalent to REO=3.7kg, and the recovery rate of rare earths is 94.9%.

Embodiment 3

[0046] see figure 1 , the C 草酸 =8.6g / L, REO=0.41g / L Terbium oxalate precipitation wastewater 5m 3 Add calcium carbonate and mix until pH=2.5, filter the suspension and wash the filter residue to obtain an intermediate residue; burn the intermediate residue at 850-1000°C to obtain 29.8kg of mixed oxide. The mixed oxide and the C produced in the extraction line 氯化铵 = 48.5g / L extraction saponification waste water 1m 3 After reacting in the stirred tank to pH ≤ 12, filter, return the filtrate to the extraction line for saponification of the organic extractant, and wash the filtered filter residue with a mixed acid of hydrochloric acid and nitric acid to obtain a rare earth material liquid, which is returned to production. The total recovery of rare earth is equivalent to REO1.9kg, and the recovery rate of rare earth is 92.7%.

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Abstract

The invention discloses a method for simultaneously treating oxalic acid precipitation waste water and ammonia-nitrogen waste water and recovering rare earth of a rare earth separation plant. The method is characterized by comprising the following steps of: treating the oxalic acid precipitation waste water by using calcium carbonate; precipitating rare earth dissolved in the oxalic acid precipitation waste water; recovering with calcium oxalate together; obtaining a mixture of calcium oxide and rare earth oxide by burning; treating the ammonia-nitrogen waste water generated in a rare earth separating process by using the calcium oxide in the mixture; generating calcium chloride by dissolving the calcium oxide, simultaneously generating ammonia water from ammonia nitrogen in the ammonia-nitrogen waste water, and generating rare earth hydrate from the rare earth; obtaining rare earth-containing filter residue by filtering and separating; returning filtrate to an extraction line for saponifying an organic extractant; obtaining rare earth material liquid by dissolving the filter residue by using an acid; and returning the rare earth material liquid for use. The method of the invention can treat the oxalic acid precipitation waste water and the ammonia-nitrogen waste water generated in various rare earth separation processes and has a simple process. Acidic waste water is treated, resource is saved, environmental pollution is reduced, rare earth is recovered, waste is utilized comprehensively and simultaneously good economic benefit is achieved.

Description

technical field [0001] The invention relates to a method for treating waste water of a rare earth separation plant while recovering rare earth, and belongs to the technical field of industrial waste water treatment. Background technique [0002] The wastewater generated in the production process of rare earth separation plants is usually divided into acid wastewater (mainly containing one or more of oxalic acid, hydrochloric acid, nitric acid, sulfuric acid, and acetic acid) and ammonium-containing wastewater (mainly containing ammonium chloride, ammonium oxalate, ammonium nitrate, One or more of ammonium sulfate, ammonium acetate, ammonia water). Acidic wastewater is mainly produced in the process of precipitating the separated and purified rare earth feed solution (usually rare earth chloride feed solution) with oxalic acid, and ammonium-containing wastewater is mainly produced in the process of rare earth extraction and separation of organic phase saponification and waste...

Claims

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Application Information

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IPC IPC(8): C02F1/66C22B59/00
CPCY02P10/20
Inventor 蔡志双刘钧云龚斌王功秒谢楠
Owner 江西明达功能材料有限责任公司
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