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Treatment method for molybdenum-containing acid wastewater

A technology of acid wastewater and treatment method, applied in water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. The effect of compactness, increased molybdenum concentration, and easy recovery

Active Publication Date: 2008-06-18
JINDUICHENG MOLYBDENUM CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional methods for the recovery of molybdenum metal in waste liquid are ion exchange and extraction, but both of them have problems such as environmental protection, long treatment cycle and difficult regeneration.

Method used

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  • Treatment method for molybdenum-containing acid wastewater

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Embodiment 1

[0021] Raw waste water: the washing liquid after washing molybdenum calcined sand with water according to the process of temperature at 90°C, solid-liquid ratio of 1:3, and time of 1 hour is filtered to obtain the original molybdenum-containing acidic waste water, the index is pH2.5, and the index of each ion is: Molybdenum 9.98g / l, copper 0.26g / l, iron 0.26g / l, potassium 0.61g / l, sodium 0.034, calcium 0.54, magnesium 0.20g / l

[0022] The first-level nanofiltration concentration and separation system treats waste water: the acidic waste water is filtered into the first-level nanofiltration system and pressurized to 1.3Mpa to ensure a flux range of 25-30L / m 2 .h or so. Concentration and separation, the concentration ratio reaches more than 6 times. Concentrate indicators: pH 2.0, molybdenum 63.30g / l, copper 1.36g / l, iron 1.63g / l, potassium 0.79g / l, sodium 0.07g / l, calcium 2.81g / l, magnesium 1.28g / l .

[0023] Permeate indicators are: pH 3.0, molybdenum 0.14g / l, copper 0.037g...

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Abstract

The invention relates to a treatment method of molybdenum-containing acid wastewater, relating to a treatment method of molybdenum-containing acid wastewater generated in the process of ammonium molybdate production. The invention is characterized in that: double-stage nanofiltration concentration membrane is adopted to perform the concentration separation of molybdenum-containing acid wastewater and recycle the molybdenum in the concentration solution, the separated-out water is re-utilized. The concentration solution after first-stage and secondary-stage treatment is added with lime water with 40 percent of mass concentration, the PH value is adjusted at 7.0-7.5, so as to make molybdenum and other heavy metal ions subsided, thereby reclaiming molybdenum, the reclaiming ratio of the molybdenum is at 98 percent, waste liquid reaches the emission standard, entire system is environment-friendly and economic.

Description

technical field [0001] A treatment method for molybdenum-containing acidic wastewater relates to a treatment method for molybdenum-containing acidic wastewater produced in the production process of ammonium molybdate. technical background [0002] In the traditional production of ammonium molybdate, ammonium dimolybdate is prepared by pickling molybdenum calcine, ammonia leaching, acid precipitation, ammonia dissolution, and evaporation crystallization. During the production process of this process, a large amount of acidic ammonia nitrogen wastewater will be generated during pickling and acid precipitation. Seriously pollute the environment. It is imperative to produce ammonium dimolybdate in a green and environmentally friendly process. The process of producing ammonium dimolybdate by washing molybdenum calcine can solve the problem of ammonia nitrogen pollution, but in the process of implementation, it is found that the wastewater produced by washing molybdenum calcine h...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F1/44C02F1/62
Inventor 周新文唐丽霞唐军利樊建军李莉
Owner JINDUICHENG MOLYBDENUM CO LTD