Tongling mouth Ridge gold beneficiation plant: the influence of molybdenum ore roof carbonaceous shale, since 1973, production of molybdenum concentrate grade is low, generally about 20 to 30% molybdenum concentrate failed to solve the problem the way out Since 1976, the plant has started research and production of ammonium molybdate. It was established in 1980 and began production in 1981, achieving good economic results.
Ammonium molybdate production process 1) Oxidation roasting: reaction formula 2MoS 2 +7O 2 = 2MoO 3 +4SO 2
2) Ammonia leaching: reaction formula MoO 3 + 2NH 4 OH = (NH 4 ) 2 MoO 4 + H 2 O
CuO+4NH 3 •H 2 O=[Cu(NH 3 ) 4 •(OH) 2 +3H 2 O
3) In addition to copper and iron : reaction formula [Cu(NH 3 ) 4 ] ++ +S -- =CuS↓+4NH 3
Fe 2 (CO 3 ) 3 +3H 2 O=2Fe(OH) 3 ↓+3CO 2
4) Crystalline ammonium molybdate: reaction formula 4(NH 4 ) 2 MoO 4 +6HNO 3 =(NH 4 ) 2 O•4MoO 3 ↓+6NH 4 NO 3 +3H 2 O
Fe(OH) 3 +HNO 3 =Fe(NO 3 ) 3 +H 2 O
5) Dehydration, drying, crushing, and packaging: Crystallized ammonium molybdate and mother liquor are sent to a centrifuge for dehydration, and dried at a constant temperature of 120 ° C for 3 hours. After drying, it is pulverized and sieved, and the particle size is passed through a 40-mesh sieve to obtain a white crystalline crystal of the finished ammonium molybdate, which is shipped in a barrel. The production process image is shown in the following figure:
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