Resource recovery and zero discharge process for treating rare-earth wet-method smelting wastewater

A technology of hydrometallurgy and resource recovery, which is applied in the directions of heating water/sewage treatment, degassed water/sewage treatment, neutralized water/sewage treatment, etc., which can solve the problems of low enthusiasm for enterprise operation, high treatment cost, and long service life of equipment To solve the problem of water pollution, simplify the treatment process and improve the treatment effect

Inactive Publication Date: 2011-06-01
广州中科院地球化学研究科技开发有限公司
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Problems solved by technology

The process is easy to operate, but it needs to add a large amount of phosphorus and magnesium chemicals, and the operating cost is high. If the precipitated magnesium ammonium phosphate can be sold as agricultural fertilizer, the operating cost can be reduced and its practicability can be increased.
Magnesium ammonium phosphate precipitation method can avoid problems such as scaling and odor of the stripping tower caused by the stripping method, and the treatment efficiency is not limited by temperature. However, the main problem of this method in the treatment of high ammonia nitrogen wastewater is the high treatment cost. Therefore, looking for Inexpensive and efficient precipitants and developing the value of sediments as fertilizers are the future development direction
[0017] At present, most rare earth smelting enterprises in my country are facing serious environmental pressure due to the limitation of wastewater treatment technology and treatment cost. Only some enterprises only use simple evaporation, concentration and crystallization process to recover ammonium chloride for high-conce

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  • Resource recovery and zero discharge process for treating rare-earth wet-method smelting wastewater
  • Resource recovery and zero discharge process for treating rare-earth wet-method smelting wastewater

Examples

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[0034] Example 1:

[0035] Taking rare earth soap wastewater, ammonium bicarbonate precipitation mother liquor, oxalic acid precipitation mother liquor, alkali soap wastewater, ammonium bicarbonate washing wastewater and straw washing wastewater from a rare earth wet smelting process as the treatment objects, the water quality characteristics are shown in Table 1, and the above 6 are taken respectively. 2m each of wastewater 3 Process according to the process of the invention.

[0036] The rare earth soap wastewater is first left to stand for 24 hours in the grease trap (1) to collect the surface oil and P 507 0.5m after the oil storage tank 1#(7) 3 / h Nikoni pump performs dissolved air flotation treatment, collects the floating oil on the surface of the air flotation degreasing pool 1#(8) to the storage tank 1#(7), and then the waste water is discharged into the ammonium bicarbonate precipitation mother liquor pool (2) and carbon The ammonium precipitation mother liquor is mixed. ...

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Abstract

The invention discloses a resource recovery and zero discharge process for treating rare-earth wet-method smelting wastewater, which comprises the following steps: (1) carrying out segregated collection on wastewater; (2) pretreatment: recovering kerosene and P507 from wastewater by floatation oil removal, and precipitating by adding alkali to remove heavy metals and oxalate radicals; (3) recovering NH4Cl in high-concentration ammonia nitrogen wastewater by triple-effect evaporation, concentration and crystallization; (4) denitrifying medium/low-concentration ammonia nitrogen wastewater by ammonia stripping/absorption; (5) carrying out reverse osmosis desalination advanced treatment on the wastewater; and (6) recovering CaCl2 by evaporating, concentrating and crystallizing the reverse osmosis concentrated water. The invention can produce certain economic benefits by recovering kerosene, P507 and industrial-grade NH4Cl products in the wastewater, and the wastewater can achieve the water quality standard for reuse water, thereby realizing zero discharge of wastewater in rare-earth wet-method smelting enterprises.

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Claims

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Application Information

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Owner 广州中科院地球化学研究科技开发有限公司
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