Introduction to beneficiation process of copper molybdenum separation inhibitor

Molybdenum resources in China account for about 37% of the world total, mainly concentrated in Henan, Shaanxi, Liaoning, Hebei and other places, most of which are from porphyry copper molybdenum deposits. At present, with the development of economic construction, the demand for copper molybdenum separation inhibitors is growing. However, copper molybdenum resources have many problems, such as more lean ores and less rich ores, serious symbiosis, more other useful components, fine embedded particle size, similar suspension of molybdenite and copper sulfide ore. Therefore, the research and application of copper molybdenum separation inhibitor separation technology is particularly important. Now let's learn about the copper molybdenum separation inhibitor beneficiation process!
1. Flotation separation technology of copper molybdenum separation inhibitor
At present, flotation is widely used to treat copper molybdenum ores with mature technology and good indicators. In principle, there are three flotation methods of copper molybdenum ore, namely, mixed flotation and preferential flotation. In production, mixed flotation is often used, but sometimes preferential flotation or equal flotation is also used.
2. Copper molybdenum separation inhibitor mixed flotation technology
The mixed flotation copper molybdenum separation process is adopted for many copper molybdenum ores because the floatability of molybdenite and chalcopyrite are similar and associated seriously. This process has low cost and simple process.
3. Mixed flotation link
Generally speaking, xanthate (butyl xanthate), auxiliary collector hydrocarbon oil and terpineol are used as foaming agent, and lime and water glass are used as profile control agents for flotation collectors. An experimental study was carried out on a low-grade copper molybdenum ore in Anhui Province. The results showed that kerosene was used as the collector, and BK301C was used as the auxiliary collector for copper molybdenum mixed flotation. At the dosage of 59g/t, the recovery of copper and molybdenum reached 93.01% and 73.2% respectively
4. Separation pretreatment of copper molybdenum separation inhibitor
Generally, copper molybdenum separation process has two schemes: molybdenum floatation copper inhibition and copper floatation molybdenum inhibition. As molybdenite floats more easily, copper floatation molybdenum inhibition is adopted. However, molybdenum copper suspension suppression technology should be considered when separating high copper and low molybdenum ores. This is because copper inhibition requires high reagent cost. In addition, molybdenite has good suspension, and inorganic or organic small molecule inhibitors are not easy to work, so macromolecular inhibitors such as dextrin, starch, humic acid and tannic acid can be selected.
The separation of copper and molybdenum mainly includes pretreatment before separation, inhibition of copper minerals in separation and re concentration of copper and molybdenum after separation. Pretreatment mainly includes the following methods:
1) Concentrate the mixed concentrate. It is mainly used to remove residual reagents and frother in flotation copper molybdenum mixed concentrate. The pretreatment was strengthened in the second phase reconstruction of Wutong Molybdenum concentrator. Ceramic filter was used as the concentration equipment after copper molybdenum mixed flotation, which solved the problem of molybdenum ore separation and obtained molybdenum concentrate with a grade of 57.75%. Lei Guichun used cyclone to concentrate and de medicate the mixed copper molybdenum concentrate of Dexing Copper Mine. The grade of molybdenum concentrate increased by 0.63%, the recovery rate increased by 11.14%, and the consumption of sodium sulfide decreased by 32.17%.
2) Heating mode. Heating the mixed concentrate can decompose the collector on the mineral surface, destroy the hydrophobic film, and evaporate the foaming agent in the slurry. In this way, the surface of copper minerals will be oxidized, reducing and inhibiting the floatability, but having little impact on molybdenite, so as to achieve separation. At present, the main heating methods are heater, roasting, steam blowing, etc. It is confirmed that about 40% of copper molybdenum concentrators in the world use heat treatment, which can not only reduce the consumption of sodium sulfide, but also significantly improve the beneficiation index.
3) Add reagents. The surface of copper mineral is oxidized and hydrophilic, and the attached trapping agent is oxidized and decomposed. When pH is 10~11, O2 in the pulp can oxidize chalcopyrite to S2O32 - and inhibit it. Natarajan et al. used electrochemical tests to verify that ozone effectively oxidizes and decomposes the collector on the chalcopyrite surface, which is better than oxygen.
Therefore, it is possible for chalcopyrite to inhibit copper floating molybdenum by controlling the conditions such as oxygen introduction of minerals and pH adjustment. However, it should be noted that when there is too much oxidant, it is the sulfide ore with strong reducibility in the next copper floating molybdenum inhibition unit
5. Copper molybdenum separation inhibition link
After pretreatment, copper and molybdenum can be separated. One of the keys is the selection of flotation inhibitors. Inhibitors can be divided into inorganic substances and organic substances. The inorganic substances are mainly camphor and sodium sulfide, and the organic substances are mainly mercaptoacetate, which can be used alone or mixed.
1) Sodium sulfide. It is mainly sodium sulfide, sodium sulfide, ammonium sulfide, etc. It is confirmed that SH -, which mainly inhibits the hydrolysis of sulfide, is formed. In actual production, sodium sulfide and sodium hydrogen sulfide are mostly used. For example, Na2S is used to inhibit copper floating molybdenum in copper mine, which has good beneficiation indexes, but sodium sulfide is easy to be oxidized and ineffective, and the amount is too high, reaching 80~100 kg/t
2) Mercaptoacetates. In particular, mercaptoacetic acid has good inhibition effect, less use, less pollution and high selectivity. The mercaptoacetic acid was synthesized by sodium sulfide method. The industrial test was carried out in copper mine, and good depressant effect was obtained. The grade of molybdenum concentrate obtained was 51.53%, the recovery rate of molybdenum concentrate was 79.89%, and the copper content was only 0.32%
3) New inhibitors. Such new synthetic inhibitors as DPS, chalcopyrite and galena can obviously inhibit, but have little impact on molybdenite. The dosage is 1/5 of sodium mercaptosulfonate and 1/10 of sodium sulfide. The stability is good. The synthetic route is simple. Compared with mercaptoacetic acid, CM1 has more obvious inhibition effect, less dosage (less than 20g/L), fast action time, and galena also has inhibition effect.
6. Copper molybdenum separation and concentration link
After molybdenum separation, the next molybdenum cleaning and copper cleaning shall be carried out. Molybdenum generally needs 6 times of cleaning to meet smelting requirements. Some molybdenum in the mixed flotation concentrate may not be completely dissociated, so the re grinding process is inevitable. The process of copper molybdenum ore has been improved, and the regrinding process before molybdenum separation has been added. The grade of molybdenum final concentrate is 46.49%, and the recovery rate is 92.26%, which is 0.5% and 3.97% higher than that without regrinding.
7. New technology and equipment for copper molybdenum separation inhibitor separation
1) Application of flotation column
One of the advantages of flotation column is that the content of fine particles and fine mud that are not easy to mineralize is high, and the recovery effect is good. Copper molybdenum ore is characterized by fine disseminated particle size, low grade of raw ore, serious association, and need fine grinding particle size. In addition, due to the serious over grinding and difficult separation, flotation column can be used to replace part of flotation machine to improve the separation effect. At present, many flotation columns have been applied, such as cyclonic static micro bubble flotation column, Jameson flotation column, SFC type packed static flotation column, etc.
2) Application of potential regulation technology
Flotation electrochemistry also plays a significant role in the application of copper molybdenum separation. Sequential flotation of different sulfide ores is achieved by controlling pulp potential. Chander et al. tried electrochemical flotation separation using external potential control method. Krishnaswamy et al. concluded that the reason why molybdenite can float naturally is that its ability to conduct electrons is low, that is, the change of mineral potential has little impact on it. In contrast, chalcopyrite flotation requires oxidized ores. Therefore, chalcopyrite, which is controlled by external electricity for mineral pH and potential, is restrained under reducing atmosphere, and molybdenite can still be floated and separated. 8. Copper molybdenum preferential flotation technology
The effective pretreatment of copper molybdenum separation inhibitors and the selection of inhibitors are the key links of copper molybdenum mixed flotation and re separation. Concentration, heating and oxidation can effectively destroy and remove the agents, but can not cause "secondary pollution".