Ammonium molybdate extraction technology and operation process
Ammonium molybdate is white or pale green crystal, relative density of 2.
Soluble in water, acid and alkali, insoluble in alcohol.
Ammonium molybdate is a kind of important molybdenum acid salt, is the production of molybdenum powder, important raw material of molybdenum metal products, also widely used in chemical reagents, catalysts, flame retardants and drugs etc. , plays an important role in the national economy.
in the preparation of nickel molybdenum and ammonium molybdate, have developed new technology of extraction of ammonium molybdate.
The process including roasting, leaching, solvent extraction process of three.
Practice, nickel molybdenum oxide by oxidizing roasting method first, from the nickel molybdenum, nickel, molybdenum and other metal sulfide into oxide and pass into the reaction gas saturated sodium carbonate solution, used for the preparation of sodium metabisulfite, then under the condition of going into the active oxygen, with a strong base (
Selective leaching of molybdenum extraction, can achieve the purpose of nickel molybdenum separation;
Then join MgCl to purify in removing impurity, leaching liquid purified by solvent extraction of molybdenum and ammonium molybdate is prepared.
ammonium molybdate operation flow chart:
ammonium molybdate extraction in practice, there are some problems to be solved.
1, the high demand for raw materials, the Mo is greater than 60%, and the limitation on the impurities is very strict.
2, high demand for roasting of molybdenum concentrate, soluble molybdenum is greater than 98%.
3, auxiliary process longer, especially in the leaching residue and waste liquid treatment.
4, in the process of operation, the wastewater treatment pressure is heavier, such as heavy metal wastewater and ammonia nitrogen wastewater, etc. , at the same time can also lead to the wastewater discharge of the loss of molybdenum.
5, when the operating environment is bad, there will be pollution of ammonia volatilization and ammonium sulfate, make the operation field environment.
these problems are to be carried out in in the extraction of ammonium molybdate, ammonium molybdate industrial production also need to solve the problem.
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