New progress in molybdenum beneficiation technology

In the past 10 years, the world's molybdenum beneficiation technology has made great breakthroughs and achieved rapid development, which are mainly reflected in equipment, chemicals and processes.
1, equipment
(1) Large-scale: In the past decade or more, the scale of plant selection, especially the copper -molybdenum plant, has become larger and larger (Table below). The diameter of the ball mill has exceeded 5m, and the diameter of the semi- autogenous mill has exceeded 10m.
Large grinding equipment
Plant selection
Scale (kt/d)
Production time (year)
Semi-autogenous grinding machine (m)
Ball mill (m)
Flotation machine
5.05.0×7.0 2 sets
5.05.0×8.2 2 sets
18 slots per line 17m 3
600H Denver DR type
Dominican type
5.05.0×8.8 4 sets
Two series, 12 sets per series
36m 3 and D-R1275
La calidad
(La Caridad)
5.05.0×7.3 12 sets
(Sar Cheshmen)
5.05.0×8.2 2 sets
(2) Flotation column reapplied: Flotation columns invented by Buting and Trebble in Canada obtained Canadian patents in 1963. However, since the mid-1960s, it has been in a state of stagnation. Great progress has been made in recent years.
The original copper-molybdenum separation of the Gaspe copper-molybdenum plant in Canada is a flotation machine that uses a rough selection, a re-grinding, and thirteen selection processes to obtain a molybdenum containing 50.26% and a molybdenum recovery rate of 64.51. % molybdenum concentrate.
From May to June 1980, Gaspe made the first transformation; replaced a flotation machine with a 0.9×0.9×12m flotation column for the second molybdenum selection, using a 0.45×0.45×12m flotation The column is selected for the third time, and the concentrate is directly regrind and then enters the 4th to 9th selection. The modified process simplifies 13 selections to 7 times. Finally, a molybdenum concentrate containing 50.05% of molybdenum and 71.98% of molybdenum recovery was obtained. Obviously, the recovery rate of molybdenum has increased significantly.
In 1982, Gaspe made another second transformation: using a 1.8 × 1.8 × 12 m flotation column for the first selection, the second selection of flotation column concentrate for re-grinding, the third selection float After the column is moved to the regrind, it will replace 10~13 selected jobs. The modified selected work consists of three flotation columns (and no flotation machine). The new equipment and new process have significantly improved the grade and recovery of molybdenum concentrate: molybdenum content 52.36%, molybdenum recovery rate 80.31%.
The former Soviet Union's Capck copper-molybdenum plant replaced a 12 Ñ„MP-25m Mihano B-6-A flotation machine with a Ñ„II-40 flotation column. The flotation machine selects the coarse concentrate with 0.85% molybdenum, the recovery rate is 90.79%, and the tailings contains 0.0068% molybdenum. The flotation column concentrate contains 1.313% molybdenum, a recovery rate of 91.88%, and a tailings grade of 0.0052%. Obviously, as a rough selection, the grade and recovery of molybdenum are significantly improved. Other selection plants are making similar attempts.
(3) The degree of automation increases; due to the application of large equipment, the application of flotation column, the degree of automation also increases. According to foreign statistics, the automation of the plant can generally increase the equipment by 10%~15%, the labor productivity by 25%~50%, and the production cost by 3%~5%.
The Claymax plant was monitored by electronic computer in the rough selection section: the amount of ore, water supply, ball mill power consumption, cyclic load overflow concentration, and equipment operation status. In addition, Mission, Lonex, and Chuquicamat use electronic computers for automation control to varying degrees.
2. Pharmacy
Recently, molybdenum or copper-molybdenum flotation agents have developed most rapidly. Most of this should be left in the second chapter for introduction.
(1) Collector : In 1906, Emor first used fuel oil as a molybdenite collector, and in 1918 it was first used in the production practice of Claymax. For a long time, hydrocarbon oils have been widely used as typical collectors for molybdenite. In recent years, the invention and utilization of some new and more effective collectors have brought molybdenite ore dressing into a new stage.
The first Cintex used by Claymax in 1946 was a good emulsifier for hydrocarbon oils. Its application makes the molybdenum "rough grinding, rough selection" process possible, and is widely used.
In recent years, Syntex VB, which has a higher active ingredient content, has appeared to act as an oil emulsifier more effectively.
Beijing General Research Institute of Mining and Metallurgy developed country PF-100, S-11, Shenyang Institute of nonferrous metals developed sulfur monoglycerides, Jinduicheng Molybdenum Company in cooperation with the Institute of Chemical developed by Xin Pentax, are From the synthetic point of view, China's coconut oil resources are abundant and produced, similar to Xintex's hydrocarbon oil emulsifier. They were industrially tested in Jinduicheng, Yangjiazhangzi and Xiaosigou, respectively. The coarse grinding grain size was coarsened to varying degrees, the crude molybdenum yield was increased, and the processing capacity of the plant was increased.
In addition to emulsifiers, a new batch of strong collectors has emerged, such as:
U.S. RM Perlman developed, produced by Phillips Petroleum Series Austrian side agent: Orform Co300, Orform Co400, molybdenum added benefit floating ball mill or the like instead of fuel oil, used as a copper - molybdenum ore collector, allows the recovery of molybdenum 80.2% increased to 91.6% and 96.9%.
Developed by A. Weisers and DR Xiao, the Pennfloat 3 agent manufactured by Pennwater, USA is a high-efficiency, water-soluble collector composed of n-dodecyl mercaptan and a dispersant, and more than 30 kinds of sulfide ore. Both have a good harvesting effect.
In the former Soviet Union, non-ionic thiocarbamate (UTK) was used in combination with xanthate to capture copper-molybdenum ore, which enhanced the copper-molybdenum sorting effect.
Suoluo Mo metal former Soviet Union developed butynyl collector, it was adsorbed on a coordinate bond molybdenite surface of pyrite collector almost no effect.
Yangjiazhangzi molybdenum ore dressing plant long-term use of coal oil, combined xanthate collector molybdenite, Beijing Institute of Mining and Metallurgy total sodium aerofloat again - to replace the kerosene combined xanthate - a combination of agents kerosene, but also increase molybdenum recovery .
A by-product of the production of isooctyl alcohol in the former Soviet Union - a 70% to 90% mixed fatty alcohol containing 12 to 18 carbons, combined with xanthate and dithiosulfate, used as a copper-molybdenum ore collector, copper yield Increased by 2.7%, the molybdenum yield increased by 7%.
There are also many successful combinations of mixed drugs, which are described in detail in Chapter 2.
(2) Inhibitors: In addition to the adjustment of the original inorganic inhibitors, the greatest advancement of inhibitors is the research and application of low molecular organic inhibitors.
Thioglycolic acid or sodium thioglycolate has been successfully applied in Cyprus - Pima, Dr. Hill, Baghdad. Cyprus has been in production since 1980. Industrial practice has confirmed that the agent has a good inhibitory effect on a variety of non-molybdenum sulfide minerals, and the effect is similar to that of cyanide, but it is almost non-toxic. The Northwest Institute of Nonferrous Metals has used sodium thioglycolate to study the copper suppression of Jinduicheng molybdenum.
A series of low-toxic and non-toxic organic inhibitors such as thioglycerol, choline and xanthate have also been studied and applied.
3, the process
There are not many changes in the molybdenum selection process abroad. The main ones are:
(1) The copper-molybdenum plant gradually uses the fine-semi-self-grinding-ball mill to replace the three-stage closed-circuit crushing of the system, the rod mill-ball mill crushing-sulphur grinding process.
(2) In the copper-molybdenum sorting, when an inhibitor such as NaHS, Na 2 S, or NoCks is added, nitrogen is used instead of air. Nitrogen charging reduced the Na 2 S consumption significantly.
(3) With the requirements of high-purity concentrates, copper-molybdenum mines tend to filter the flotation molybdenum concentrate and then leaching and removing copper. When the copper phase is mainly chalcopyrite or copper blue, it is usually leached with a normal temperature sodium cyanide solution. When the copper phase is mainly chalcopyrite, it is usually leached with ferric chloride, calcium chloride or hydrochloric acid solution (Brunda method).
(4) For molybdenum concentrate containing talc or organic carbon, it has been selected after low temperature roasting. Now there are talc-killing processes such as MgSO4 and re-selection of carbon removal processes.
The country is still improving the coarsening of the particle size and the number of refining sections of the coarse concentrate.

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