Method for preparing ammonium tetramolybdate by treating molybdenum-rich wastewater and waste slag

A technology of ammonium tetramolybdate and ammonium molybdate, applied in chemical instruments and methods, molybdenum compounds, inorganic chemistry and other directions, can solve the problems of high consumption of easily decomposable chemicals, high energy consumption of evaporation and concentration, and poor application prospects, Achieve the effect of improving the conversion rate of molybdenum and the utilization rate of molybdenum resources, eliminating inventory pressure and improving the utilization rate of molybdenum resources

Active Publication Date: 2014-02-05
JINDUICHENG MOLYBDENUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process has cumbersome steps, and because sodium hypochlorite is easy to decompose due to the high temperature, the consumption of chemicals is large, and the concentration of molybdenum in the leached alkali solution is small. After removing impurities, evaporation and concentration consume a lot of energy, and the application prospect is not good.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Step 1. Concentrate the molybdenum calcine washing wastewater. The concentration of main metal ions in the concentrated wastewater is: Mo93.54g / L, Cu0.12g / L, Fe3.29mg / L, K0.27g / L, Na0.18g / L L, Ca0.91mg / L, Mg3.50mg / L; Then the acid precipitation and crystallization mother liquor in the molybdenum calcination washing waste water after the concentration and ammonium molybdate production process are mixed uniformly by the volume ratio of 1: 1, obtain mixed solution, The main metal ion concentrations in the acid precipitation mother liquor are: Mo6.06g / L, Cu0.006g / L, Fe1.09mg / L, K0.074g / L, Na0.17g / L, Ca0.021g / L, Mg0.04mg / L L;

[0038]Step 2. Add molybdenum calcined sand to the water-washed molybdenum calcined sand ammonia immersion waste residue with a mass percentage content of 21.7%. The main metal mass content in the molybdenum calcined sand is: Mo63.38%, Cu0.09%, Fe1.18 %, K0.07%, Na0.018%, Ca0.25%; then add the water-washed molybdenum calcine ammonia leaching waste sla...

Embodiment 2

[0047] Step 1. Concentrate the molybdenum calcine washing wastewater. The concentration of main metal ions in the concentrated wastewater is: Mo90g / L, Cu0.13g / L, Fe3.28mg / L, K0.27g / L, Na0.15g / L, Ca0.90mg / L, Mg3.50mg / L; Then the concentrated molybdenum calcine washing waste water and the acid precipitation crystallization mother liquor in the ammonium molybdate production process are mixed uniformly at a volume ratio of 1:0.5 to obtain a mixed solution, and the acid precipitation The main metal ion concentrations in the mother liquor are: Mo6.06g / L, Cu0.006g / L, Fe1.09mg / L, K0.074g / L, Na0.17g / L, Ca0.021g / L, Mg0.04mg / L;

[0048] Step 2. Add molybdenum calcine to the water-washed molybdenum calcine ammonia immersion waste residue with a mass percentage content of 30%. The main metal mass content in the molybdenum calcine is: Mo63.35%, Cu0.088%, Fe1.15 %, K0.08%, Na0.018%, Ca0.275%; then add the water-washed molybdenum calcine ammonia leaching waste slag added with molybdenum calci...

Embodiment 3

[0057] Step 1. Concentrate the molybdenum calcine washing wastewater. The concentration of main metal ions in the concentrated wastewater is: Mo95g / L, Cu0.15g / L, Fe3.32mg / L, K0.29g / L, Na0.15g / L, Ca0.88mg / L, Mg3.42mg / L; Then the acid precipitation crystallization mother liquor in the production process of molybdenum calcination after concentration is mixed with the acid precipitation crystallization mother liquor in the production process of ammonium molybdate by the volume ratio of 1: 2, obtains mixed solution, acid precipitation The main metal ion concentrations in the mother liquor are: Mo6.06g / L, Cu0.006g / L, Fe1.09mg / L, K0.074g / L, Na0.17g / L, Ca0.021g / L, Mg0.04mg / L;

[0058] Step 2. Add molybdenum calcined sand to the water-washed molybdenum calcined sand ammonia immersion waste residue with a mass percentage content of 15%. The main metal mass content in the molybdenum calcined sand is: Mo63.38%, Cu0.09%, Fe1.18 %, K0.07%, Na0.018%, Ca0.25%; then add the water-washed molybd...

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Abstract

The invention discloses a method for preparing ammonium tetramolybdate by treating molybdenum-rich wastewater and waste slag, which comprises the following steps: 1. washing a molybdenum roasted product with water, concentrating wastewater, and uniformly mixing with an acid precipitation crystal mother solution in an ammonium molybdate production process, thereby obtaining a mixed solution; 2. adding a molybdenum roasted product into water-washed molybdenum roasted product ammonia leaching waste slag, adding into the mixed solution, regulating the pH value, magnetizing, and stirring to react to obtain a solid-liquid mixed slurry; 3. carrying out solid-liquid separation, and carrying out ammonia leaching on the filter cake; 4. carrying out solid-liquid separation to obtain an ammonia leaching solution and ammonia leaching slag; 5. carrying out ammonia leaching on the ammonia leaching slag; and 6. removing impurities from the ammonia leaching solution, purifying, carrying out acid precipitation, and filtering to obtain the solid ammonium tetramolybdate. The molybdenum roasted product-doped molybdenum roasted product ammonia leaching waste slag is added into the wastewater and acid precipitation mother solution, and liquid-phase magnetization is carried out to efficiently utilize the molybdenum resources in the wastewater and waste slag, thereby greatly lowering the treatment cost for molybdenum-containing waste slag and wastewater, being energy-saving and environment-friendly, and effectively enhancing the molybdenum resource utilization ratio in molybdenum roasted product water-washing concentrated wastewater and ammonia leaching waste slag.

Description

technical field [0001] The invention belongs to the technical field of recovery and reuse of molybdenum resources, and in particular relates to a method for preparing ammonium tetramolybdate by treating molybdenum-rich waste water and residue. 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. [0003] The process of washing molybdenum calcine to produce ammonium dimolybdate can effectively avoid the disadvantages of environmental pollution caused by ammonia nitrogen wastewater produced by traditional processes. It has become one of the mainstream processes for the production of ammonium dimolybdate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G39/00
Inventor 樊建军朱永安王晓娟杨艳李辉李莉徐健昌
Owner JINDUICHENG MOLYBDENUM CO LTD
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