Method for treating rare earth ammonium chloride wastewater

A treatment method and ammonium chloride technology, applied in rare earth metal compounds, chemical instruments and methods, water/sewage multi-stage treatment, etc., can solve the problem of low recycling rate of rare earth wastewater, achieve low production cost and improve recovery rate , the effect of reducing environmental pollution

Inactive Publication Date: 2012-07-04
江西德盛精细化学品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The present invention aims to provide a recovery and treatment method for ammonium chloride in rare earth wastewater, which directly reuses the ammonium chloride raffinate, carbon precipitation mother liquor and rare earth carbonate precipitation washing liquid produced by the extraction and separation of rare earth, solving the problem of rare earth Technical Problems of Low Wastewater Recycling Rate

Method used

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  • Method for treating rare earth ammonium chloride wastewater
  • Method for treating rare earth ammonium chloride wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Realize the treatment of rare earth ammonium chloride wastewater by the following steps, and its technology is.

[0034] (1) Dissolving the rare earth chloride, the mass fraction of the rare earth oxide in the solution is 250g / L, filtering and removing impurities to obtain the rare earth chloride feed liquid.

[0035] (2) Use kerosene to distill the extractant P 507 Dilute to 1.5mol / L, and then saponify with ammonia water (saponification degree is 35%) to obtain an organic phase.

[0036] (3) Mix the rare earth chloride feed liquid obtained in step (1) with the saponified organic phase in step (2) at a volume ratio of 2:1 in a mixing and clarifying extraction tank, so that the ammonium chloride raffinate and the rare earth-containing The organic phase of the elements is separated on standing.

[0037] (4) Return the ammonium chloride raffinate in step (3) to step (1), repeat steps (1) to (3), and circulate twice to increase the concentration of ammonium chloride in th...

Embodiment 2

[0045] Realize the treatment of rare earth ammonium chloride wastewater by the following steps, and its technology is.

[0046] (1) Dissolve the rare earth chloride, the mass fraction of the rare earth oxide in the solution is 150g / L, filter and remove impurities to obtain the rare earth chloride feed liquid.

[0047] (2) Use kerosene to extract the extractant P 204 Dilute to 1.5mol / L, and then saponify with ammonia water (saponification degree is 45%) to obtain an organic phase.

[0048] (3) Mix the rare earth chloride feed solution obtained in step (1) with the saponified organic phase in step (2) at a volume ratio of 1:1 in a mixing and clarifying extraction tank, so that the ammonium chloride raffinate and the rare earth-containing The organic phase of the elements is separated on standing.

[0049] (4) Return the ammonium chloride raffinate in step (3) to step (1), repeat steps (1) to (3), and circulate 4 times to increase the concentration of ammonium chloride in the a...

Embodiment 3

[0057] Realize the treatment of rare earth ammonium chloride wastewater by the following steps, and its technology is.

[0058] (1) Dissolve the rare earth chloride, the mass fraction of rare earth oxide in the solution is 300g / L, filter and remove impurities to obtain the rare earth chloride feed liquid.

[0059] (2) Use kerosene to distill the extractant P 507 Dilute to 1.5mol / L, then saponify with ammonia water (saponification degree is 40%) to get the organic phase.

[0060] (3) Mix the rare earth chloride feed liquid obtained in step (1) with the saponified organic phase in step (2) at a volume ratio of 2:1 in a mixing and clarifying extraction tank, so that the ammonium chloride raffinate and the rare earth-containing The organic phase of the elements is separated on standing.

[0061] (4) Return the ammonium chloride raffinate in step (3) to step (1), repeat steps (1) to (3), and cycle twice to increase the concentration of ammonium chloride in the ammonium chloride r...

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Abstract

The invention discloses a method for treating rare earth ammonium chloride wastewater, belonging to the field of wastewater treatment. The method for treating the rare earth ammonium chloride wastewater comprises the steps of: dissolving ammonium chloride rare earth, carrying out organic phase saponification, carrying out extraction separation, recycling wastewater, stripping, carbon-sinking, washing, evaporating, cooling and crystallizing. According to the method, ammonium chloride raffinate and carbon sink mother liquor which are generated by extraction separation on the rare earth are used as the solvents of the ammonium chloride rare earth for recycling so that the ammonium chloride in the wastewater is increased, the ammonium chloride is favorably evaporated and condensed, and energy resource consumption is reduced. Meanwhile, washing liquor of rare earth carbonate precipitates is recycled for preparing a precipitating agent, thus water resources are saved. The mass percent of the ammonium chloride in the recycled finished product is 91.7-96.5 percent in the terms of dry basis; and the economic benefit is remarkable, the wastewater is recycled, and zero emission of the rare earth wastewater is recycled.

Description

technical field [0001] The invention belongs to the field of wastewater treatment. Background technique [0002] The rare earth industry in my country produces more than 20 million tons of wastewater every year, and the ammonia nitrogen content in the wastewater is 300-5000mg / L, which exceeds the national standard by ten times or even hundreds of times. Ammonia nitrogen wastewater is mostly composed of P 507 Produced by saponification, single rare earth separation and carbon precipitation ammonium salt process, the mass concentration of ammonium chloride in wastewater is as high as 11000 mg / L, which not only causes a huge waste of resources, but also poses a serious threat to the ecological environment. [0003] Since the COD in the rare earth ammonium salt wastewater is only about 200mg / L, the biodegradability of the wastewater is very low, and the carbon source is seriously insufficient during denitrification, which is not suitable for biological treatment. At present, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/00C01C1/16C02F9/10
Inventor 邱祖民郑楠李会婷刘杰
Owner 江西德盛精细化学品有限公司
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