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Method for treating and recycling molybdenum calcine water-washing waste water

A technology for waste water treatment and molybdenum calcining, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of environmental protection, long treatment period, frequent membrane cleaning, difficult regeneration, etc., achieving less consumables, small equipment investment, and simple operation. Effect

Active Publication Date: 2012-07-11
JINDUICHENG MOLYBDENUM CO LTD
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  • Summary
  • 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.
Although the nanofiltration membrane treatment process has strong pressure resistance, strong anti-fouling ability and chargeability, and can separate low-valent ions from high-valent ions, it also has the disadvantages of frequent cleaning of the membrane and short service life. In addition, the concentrated water after washing wastewater needs to be further treated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The pH value of the molybdenum calcine washing wastewater in this embodiment is 3-4, and the concentration of each ion in the wastewater is: molybdenum 24.29g / L, copper 0.5g / L, iron 0.74g / L, potassium 0.8g / L, sodium 0.028g / L, calcium 0.21g / L, magnesium 0.35g / L; acid precipitation crystallization mother liquor pH value is 5, each ion index is: molybdenum 15.74g / L, copper 0.004g / L, iron 0.0026g / L, potassium 0.076g / L, sodium 0.17g / L, calcium 0.015g / L, magnesium 0.024g / L.

[0021] The method that the molybdenum calcined sand washing waste water of the present embodiment is treated and recycled is:

[0022] Step 1, mix the molybdenum calcination wastewater with the acid precipitation crystallization mother liquor in the ammonium molybdate production process in a volume ratio of 1: 2.5 and stir evenly, then use nitric acid (also can be replaced by other acids) to adjust the pH value to 2.5, continue Stir for 30min to obtain a solid-liquid mixture;

[0023] Step 2, adopt p...

Embodiment 2

[0025] The filter cake that embodiment 1 is obtained is sent into the ammonium molybdate production process and carried out conventional ammonia leaching process; The roasted molybdenum concentrate is pickled, the pickling temperature is 90°C, the pH value is 0.5-1, the liquid-solid ratio (the mass ratio of the filtrate to the roasted molybdenum concentrate) is 3:1, and the pickling time is 1h Then adopt plate and frame filter press to carry out solid-liquid separation to the slurry after pickling treatment, the filter cake obtained by separation is sent into the ammonia leaching operation of ammonium molybdate production process to carry out ammonia leaching treatment, and the filtrate obtained by separation is sent to into the wastewater treatment system and then discharged after reaching the standard.

[0026] The mass content of molybdenum in the roasted molybdenum concentrate of the present embodiment is 63.03%, the mass content of copper is 0.13%, and the mass content of...

Embodiment 3

[0028] The pH value of the molybdenum calcine washing wastewater in this embodiment is 3-4, and the concentration of each ion in the wastewater is: molybdenum 26.64g / L, copper 0.96g / L, iron 0.029g / L, potassium 0.68g / L, sodium 0.027g / L, calcium 0.026g / L, magnesium 0.03g / L; acid precipitation crystallization mother liquor pH value is 2.5, each ion index is: molybdenum 15g / L, copper 0.016g / L, iron 1.52g / L, potassium 0.056g / L L, sodium 0.15g / L, calcium 0.24g / L, magnesium 0.34g / L.

[0029] The method that the molybdenum calcined sand washing waste water of the present embodiment is treated and recycled is:

[0030] Step 1, mix the molybdenum calcination wastewater with the acid precipitation crystallization mother liquor in the ammonium molybdate production process at a volume ratio of 1:0.5 and stir evenly, then adjust the pH value to 1.0 with nitric acid (also can be replaced by other acids), continue Stir for 60min to obtain a solid-liquid mixture;

[0031] Step 2, adopt plat...

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Abstract

The invention discloses a method for treating and recycling molybdenum calcine water-washing waste water. In the method, molybdenum calcine water-washing waste water and an acid precipitation crystalized mother liquor produced in an ammonium molybdate production process are mixed in the volume ratio of 1:(0.5-5), and molybdenum in the molybdenum calcine water-washing waste water and molybdenum inthe acid precipitation crystalized mother liquor are precipitated for recycling. In the method, water-washing and acid precipitation molybdenum-containing waste water is treated by adopting a unique mixed precipitation method, molybdenum in waste water is precipitated through mixed precipitation for recycling conveniently, a filtrate is returned to an acid washing procedure simultaneously, and acid-washed waste water meets an environmental protection requirement after being treated through the conventional waste water treatment system. The method is used for comprehensively treating two typesof waste water at one time, and has the characteristics of small equipment investment, low material consumption, easiness for operating, wide adaptation, and the like.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a method for treating, recycling and reusing molybdenum calcined sand washing wastewater. Background technique [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 molybdenum content in the wastewater produced by washing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C22B7/00C22B34/34
Inventor 樊建军李辉杨艳曹翠亚李莉
Owner JINDUICHENG MOLYBDENUM CO LTD
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