Status of foreign molybdenum wire ore beneficiation

Molybdenum concentrate leaching
Some get a molybdenum concentrate plant , copper , lead, iron

and other impurities substandard . According to the U.S.

Climax Molybdenum Company's quality molybdenum concentrate

quality standards : MoS2 should be 95%, Cu should be less

than 0.15%, Pb should be less than 0.05%. In the

international market , quality almost, prices sent many ,

such as the company's high-quality molybdenum concentrate

price of 1 July 1975 was $ 2.43 / lb , unqualified to $ 2.236

/ lb, the race to 2.5 ~ 17 %. In order to reduce the content

of these metals , and some plant using different leaching

process .
    Brenda plant concentrate containing 55.3% molybdenum

grade is relatively high , but the content of copper and lead

undesirable . To this end , the plant uses the Noranda

company developed the leaching process to reduce impurities

to improve the quality of concentrate . This process is the

principles and methods : copper chloride, ferric chloride

leaching of molybdenum oxide and calcium solution of Cu, Ca

and Pb cupric chloride and ferric chloride ( the amount of

103 and 41 g , respectively / t of concentrate ) in a sodium

chloride solution containing 20 to 30% of the chalcopyrite

and galena effective chlorinating agent , calcium chloride or

sodium chloride to reduce the PH value , and to increase

Boiling Point ( 4850 feet elevation Brenda located on the

leaching requires a higher boiling point ) , shorten the

leaching time . Brenda most effective plant molybdenum

leaching solution containing 1% of cupric chloride, ferric

chloride, 10% and 30 % calcium chloride . Leaching at 2 hours

at 100 ℃ , can Cu, Pb leaching rate of 98%, Ca leaching rate

of 79% is dissolved molybdenum is less than 0.5% . Used

leachate chlorine gas can be quickly regenerated. After each

batch leaching let go 30% of the leaching solution , in order

to control the leaching solution of copper and lead harmful

elements. After leaching the copper content of molybdenum

concentrate fell to 0.063 percent from 0.337 percent lead

content to 0.05 % molybdenum grade increased from 55.3% to

56.6%. After cooling the concentrate , and this was washed

twice ( including filtration and recycled pulp ) through ,

and a final filtration and dried .
    Valencia Rita plant selection molybdenum concentrate

containing 47 to 48% molybdenum , copper contained in order

to further remove , to improve the quality , the plant uses a

ferrous chloride leaching . The first process is filtered and

dried to molybdenum temperature 2% , and ferrous chloride

leaching of copper leaching solution ( 2.5 ~ 3.0% ) ,

molybdenum up to grade 53 to 54 %. After the concentrate

leaching and filtered again and dried , and within 2 meters

of the roaster roasting ф.16 give trioxide, 60 to 61 percent

of its grades , less than 1% sulfur , into the alloy

preparation plant molybdenum iron. Cologne plant in order to

reduce the copper content of molybdenum , using sodium

chloride leaching, the product is filtered and then dip the

slurry , and then sent to acid leaching , in order to further

reduce the amount of copper , molybdenum acid leaching after

final filtered and dried.