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Treatment technology for waste water produced in recovering rare earth waste materials

A technology of rare earth waste and treatment process, which is applied in the directions of water/sewage multi-stage treatment, light water/sewage treatment, water/sludge/sewage treatment, etc. It can solve the problems of environmental damage and inefficient treatment of waste water, etc., to achieve Effects of improving processing efficiency and reducing processing costs

Active Publication Date: 2015-05-13
无锡蓝湾资源再生科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the recovery of rare earth elements, rare earth wastes need to be treated, and many pollutants will be produced in the process of treatment. If these pollutants are not treated, they will cause serious damage to the surrounding environment. Contains a large concentration of heavy metals in the wastewater, and the existing biological treatment process cannot efficiently treat this wastewater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A treatment process for rare earth waste recovery wastewater, wherein the rare earth waste recovery wastewater includes extraction workshop wastewater, washing wastewater, and flushing wastewater, and the extraction workshop wastewater, washing wastewater, and flushing wastewater are classified for treatment;

[0020] The wastewater from the extraction workshop is pretreated sequentially through oil separation, lime neutralization, and sulfide precipitation; the pH value of the extraction workshop wastewater after neutralization with lime is 6.8-7.8. In the sulfidation and precipitation treatment of wastewater in the extraction workshop, slowly add Na 2 S·9H 2 O, the amount of medicament added is 5 times of the required theoretical amount in the heavy metal reaction process, and after adding Na 2 S·9H 2 O while stirring, the reaction time of the stirring was 3.0 h.

[0021] The washing wastewater is subjected to neutralization adjustment pretreatment; the pH value of...

Embodiment 2

[0028] A treatment process for rare earth waste recovery wastewater, wherein the rare earth waste recovery wastewater includes extraction workshop wastewater, washing wastewater, and flushing wastewater, and the extraction workshop wastewater, washing wastewater, and flushing wastewater are classified for treatment;

[0029] The wastewater from the extraction workshop is pretreated sequentially through oil separation, lime neutralization, and sulfide precipitation; the pH value of the extraction workshop wastewater after neutralization with lime is 6.8-7.8. In the sulfidation and precipitation treatment of wastewater in the extraction workshop, slowly add Na 2 S·9H 2 O, the amount of medicament added is 2.5 times of the required theoretical amount in the heavy metal reaction process, and after adding Na 2 S·9H 2 O while stirring, the reaction time of the stirring is 1.0h.

[0030] The washing wastewater is subjected to neutralization adjustment pretreatment; the pH value of...

Embodiment 3

[0037] A treatment process for rare earth waste recovery wastewater, wherein the rare earth waste recovery wastewater includes extraction workshop wastewater, washing wastewater, and flushing wastewater, and the extraction workshop wastewater, washing wastewater, and flushing wastewater are classified for treatment;

[0038] The wastewater from the extraction workshop is pretreated sequentially through oil separation, lime neutralization, and sulfide precipitation; the pH value of the extraction workshop wastewater after neutralization with lime is 6.8-7.8. In the sulfidation and precipitation treatment of wastewater in the extraction workshop, slowly add Na 2 S·9H 2 O, the addition of the medicament is 4 times of the required theoretical amount in the heavy metal reaction process, and after adding Na 2 S·9H 2 O while stirring, the reaction time of the stirring is 2 h.

[0039] The washing wastewater is subjected to neutralization adjustment pretreatment; the pH value of th...

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PUM

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Abstract

The invention discloses a treatment technology for waste water produced in recovering rare earth waste materials. The waste water produced in recovering the rare earth waste material comprises extraction workshop waste water, lavation waste water and flushing waste water which are classified for treatment; the pretreated extraction workshop waste water is mixed and adjusted with the lavation waste water and flushing waste water, and the mixture is sequentially subjected to fenton oxidation, lime sedimentation, sand leaching, activated carbon adsorption and ultraviolet light disinfection to obtain reuse water. A physicochemical treatment method is adopted by the treatment technology for the waste water produced in recovering rare earth waste materials, and the waste water containing high-concentration heavy metals can be efficiently treated; and the waste water is classified for pretreatment, the treatment efficiency is improved, and the waste water treatment cost is lowered.

Description

technical field [0001] The invention relates to a waste water treatment system, in particular to a treatment process for rare earth waste recycling waste water. Background technique [0002] my country's rare earth resources have been exploited for decades, and the amount of resources has become less and less. In recent years, the state has increased the macro-control of the rare earth industry, and the field of rare earth applications has continued to develop in depth in the industrial chain. The contradiction between supply and demand of rare earth resources has become increasingly prominent. Therefore, the recycling of rare earth elements has become an important development direction. In the recovery of rare earth elements, rare earth wastes need to be treated, and many pollutants will be produced in the process of treatment. If these pollutants are not treated, they will cause serious damage to the surrounding environment. Contains a large concentration of heavy metals...

Claims

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Application Information

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IPC IPC(8): C02F9/08C02F1/32
Inventor 李杰
Owner 无锡蓝湾资源再生科技有限公司