Henan Luanchuan Mines Limited original one of a 1000t / d molybdenum beneficiation plant, production over the years only recovered molybdenum mineral ore and molybdenum beneficiation indicators are not ideal, concentrate grade and recovery were lower, molybdenum concentrate molybdenum 35%, the recovery rate is 68%, and the ore still contains 0.04% copper and 2.76% sulfur is not recovered. In order to improve the molybdenum beneficiation index of the plant, recover the valuable mineral copper and pyrite that has not been recovered yet, and provide a reasonable and feasible beneficiation process plan and design basis for the new ore plant in the future, we will The company's molybdenum ore body has carried out research and development of molybdenum, copper and sulfur beneficiation technology , providing a reasonable and feasible molybdenum recovery scheme for on-site molybdenum beneficiation production, and also effectively recycling valuable mineral copper and sulfur. The experiment uses molybdenum and copper partial flotation and copper-molybdenum separation as the basis: supplemented by effective flotation reagents, and obtained excellent molybdenum, copper and sulfur beneficiation recovery technical indicators, which is the transformation of the enterprise's ore dressing plant and the new 5000t The /d concentrator provides a reasonable and feasible process plan for molybdenum, copper and sulphur processing, and the research results will not only increase the economic benefits of mining enterprises, but also bring new profit growth points for enterprises. The results of multi-element analysis of ore chemistry are shown in Table 1. First, the nature of the ore The main chemical composition of ore is SiO 2, A1 2 O 3, Fe and the like, followed by a very low content of non-ferrous metal element of gold CaO, MgO, S, CaF 2 , Pb, Zn, Mn , etc., but their presence molybdenum minerals improve concentrate grade and recovery has a greater impact; recovery value having mainly molybdenum content of about 0.081%, a sulfur recovery can be integrated, copper; primary metal minerals are molybdenite, chalcopyrite, pyrite, magnetic pyrite; main gangue minerals are quartz, chlorite, tremolite, diopside, sericite, kaolinite, talc, carbon and the like. Molybdenum mainly exists in the form of molybdenum sulfide ore, accounting for 93.59%, molybdenum oxide accounts for 6.41%; copper mainly accounts for 70.71% of total copper in the form of chalcopyrite, secondary copper sulfide mineral porphyrite and copper blue account for total copper 19.51%, free copper oxide minerals such as malachite and azurite accounted for 2.44%, combined with copper oxide content of 7.32%. There are many flaky silicate minerals such as sericite, chlorite, kaolin and other clay minerals in the ore. The total hardness is low, it is easy to be broken and finely ground, and it is easy to be muddy. It also contains more carbonaceous materials. . The molybdenum ore has a relatively fine grain size of -74μm and about 117.8% at -20μm. The molybdenite is mainly embedded in gangue minerals such as quartz, and is less in contact with other sulfides, which is beneficial to molybdenum. Separation between ore and other sulfides. Chalcopyrite is mostly present at the edge of pyrite, followed by the edge of magnetite. Some chalcopyrite is encased in pyrite. The size of the inlay is also small and uneven, and the coarse grain can reach 0.15μm. The fine particles are less than 5 μm, and the overall size of the inlay is fine, mostly in the range of l0 to 74 μm. Second, mineral processing test research The results of ore properties indicate that the ore is high in mud and high in carbon content. These factors have a great influence on the grade of molybdenum concentrate. The size of intergranular inlays is fine, and the degree of monomer dissociation of ore restricts the effective recovery of valuable minerals. Mineral processing experiments have explored a variety of fine mud and gangue mineral inhibitors, selected special gangue inhibitors suitable for the nature of the ore, while ensuring that valuable minerals under the conditions of sufficient monomer dissociation, in the rough selection to explore preferential flotation After the process and part of the mixed flotation process, the beneficiation process of molybdenum-copper-based mixed flotation was determined. After the molybdenum-copper mixed concentrate was obtained, the copper-molybdenum separation flotation was carried out. The separation and flotation were separated by molybdenum-copper-sulfur separation. After the molybdenum-copper separation scheme I and the molybdenum-copper-sulfur separation, the copper-sulfur separation scheme II was tested in two different schemes. (1) Study on rough selection scheme of molybdenum and copper recovery Two different schemes of molybdenum-copper preferential flotation and molybdenum-copper partial flotation were carried out. The preferential flotation process is suitable for ores with simple ore properties and large differences in floatability between minerals. Copper-molybdenum minerals have natural floatability differences, but 19.51% of secondary copper exists in the ore. The influence of secondary copper ions increases the floatability of copper-sulfur minerals, and the separation of copper, molybdenum and sulfur minerals becomes Difficult, and in order to better float the molybdenum minerals in the molybdenum preferential flotation, the use of lime and special effects inhibitors to inhibit copper and sulfur minerals, the suppressed copper minerals are difficult to recover, and also have an impact on the recovery rate of molybdenum. Copper-molybdenum partially mixed flotation scheme, which combines molybdenum copper with similar buoyancy and sulfur activated by copper ions, and then separates them. The coarse selection section does not add lime and copper inhibitors, which can prevent copper minerals from being inhibited. After recycling difficult problems. The experimental study was carried out under the same grinding fineness conditions. After adjusting the pharmaceutical system, the open-circuit test results of the two schemes are shown in Table 2. The results of different ore dressing tests for molybdenum-copper roughing indicate that: 1) copper-molybdenum partial flotation can be used to effectively recover copper-molybdenum minerals in the coarse-sorting section; 2) preferential flotation of molybdenum and copper minerals, due to the flotation process in molybdenum A large amount of lime and copper mineral inhibitors in China and Canada, copper minerals become difficult to float after being suppressed, it is difficult to recover copper minerals well, so the loss rate of copper in tailings is large. (II) Effect of grinding fineness conditions on molybdenum recovery rate Due to the fine grain size of molybdenum and copper minerals, and the molybdenum minerals are mainly embedded in the quartz gangue minerals, the grinding fineness conditions have a great influence on the recovery rate of molybdenum minerals. The closed-circuit test of copper-molybdenum partially mixed flotation under different grinding fineness conditions was carried out. The test process is shown in Figure 1. The test results are shown in Table 3. The test results show that the finer the ore grinding grain size, the higher the concentrate grade and recovery rate of molybdenum, the higher the copper concentrate grade, but the copper recovery index does not change, so the use of -74μm accounts for 95% of the grinding fineness. The conditions are more suitable for the sorting of this type of ore. (III) Determination of copper molybdenum and sulfur separation and selection scheme In the copper-molybdenum mixed flotation rough selection, we selected flotation collectors with good selectivity to copper and molybdenum and poor selectivity to pyrite minerals. In order to ensure the flotation recovery of copper-molybdenum ore, no added ferro-iron minerals. Inhibitors, therefore, some of the sulfur minerals activated by copper ions and similar to the floatability of copper-molybdenum ore are floating together with copper-molybdenum minerals. In the selective separation, we should consider the inhibition of pyrite minerals; the re-grinding of mixed concentrates On the one hand, grinding is beneficial to the decontamination of mixed concentrates, and more importantly, the degree of dissociation of the target minerals in the mixed concentrate or between the gangue minerals is improved. Therefore, we will enter the copper-molybdenum-sulfur mixed concentrate before separation flotation and carry out microscopic identification. The identification results show that the disproportionation degree of molybdenite is 90%, the continuous body is mainly adjacent to the gangue, and the second is adjacent to the pyrite. gangue is wrapped; chalcopyrite dissociation degree of 70% is wrapped with the living body mainly pyrite (typically -25μm), a small amount of gangue being wrapped, even with a smaller amount or in a fine gangue contiguous with sphalerite Raw (adjacent or wrapped in sphalerite), so we believe that the mixed concentrate needs to be reground before the copper mineral is better dissociated. According to the fineness of the inlay identified under the microscope, we will grind again. Degree control at 95% of -38μm, firstly using grinding-molybdenum-copper-copper and sulfur flotation separation and then molybdenum-copper separation flotation (Scheme I) for experimental study; considering that the degree of monomer dissociation of molybdenum has reached 90% And mainly closely related to the gangue mineral inlay, so the molybdenum flotation tailings are separated into the copper-sulfur separation by using molybdenum and copper-sulfur separation (Scheme II) for experimental research; two different separation test schemes principle process See Figure 2 and Figure 3. The test results are shown in Table 4. (4) Full process test The rough selection operation adopts molybdenum-copper partial mixed flotation scheme, and the molybdenum-copper-sulfur separation is selected by re-grinding-molybdenum-copper flotation-sulfur flotation separation followed by molybdenum-copper separation flotation (Scheme I) and molybdenum-copper-sulfur separation. After the copper and sulfur separation (Scheme II), the whole process closed-circuit test is carried out. The process principle flow is shown in Figure 4 and Figure 5. The test results are shown in Table 5. (5) Comparison of different separation and selection schemes and comparison of pharmaceutical systems The two different separation schemes have little difference in process structure. The comparison of the ore dressing index scheme I is better than the scheme II, mainly because the concentrate grades of the three concentrates of molybdenum and copper and sulfur in the scheme I are higher than Scheme II indicators, but the recovery rate indicators are slightly reduced; from the comparison of the ore dressing agent system, a large amount of sodium sulfide (10000g/t) is added in Scheme II to inhibit copper and sulfur mineral flotation molybdenum minerals; When adding lime (6000g/t) during grinding, the molybdenum-copper mineral can be selected by the flotation of sulfur minerals. The amount of sodium sulfide added during the separation of copper and molybdenum is greatly reduced to only 4,500g/t, so the use of reducing the dressing agent to the environment is adopted. Contamination, but using both options can obtain a good beneficiation index of copper molybdenum sulfur recovery. (6) Estimation of economic indicators 1. Calculated according to the production index of the original 1000t/d molybdenum ore dressing plant, the ore contains 0.081% molybdenum, 0.04% copper, 2.76% sulfur, 35% recycled molybdenum concentrate, 68% recovery rate, and annual output value molybdenum concentrate: 0.081% ×68%×300d×1000t/d×180,000/t=29,734,200 yuan 2. The test obtained mineral processing index: molybdenum concentrate grade 46.55%, recovery rate 81.47%, copper concentrate grade 11.89%, recovery rate 71.31%, sulfur concentrate sulfur content 45.13%, recovery rate 90.60%. The annual output value is 40,394,400 yuan (including molybdenum concentrate of 36,492,300 yuan, copper concentrate of 1,651,600 yuan, sulfur concentrate of 2,250,500 yuan), and the newly added annual output value is 10.651 million yuan. Third, the conclusion The reasonable and feasible molybdenum-copper partial mixed flotation rough selection process is adopted. After the coarse concentrate is re-ground, the copper-molybdenum is separated from the sulfur and separated by copper and molybdenum, which can not only obtain high-grade molybdenum concentrate products and high molybdenum concentrate recovery rate. The copper and sulfur minerals can be comprehensively recovered, and the valuable minerals in the ore can be effectively recovered to improve the comprehensive utilization rate of the ore; the ore dressing chemicals used in the ore dressing process have low environmental pollution and low ore dressing costs. The research results obtained the grade of molybdenum concentrate increased by 11.10% compared with the original production, and the recovery rate of concentrate was 13.47% higher than the original production; the new concentrates of copper concentrate and sulfur concentrate were added to the original manufacturer, not only for the manufacturer. Increased the output and value of existing products, and also brought new profit growth points for manufacturers. Even if the price of non-ferrous metal products is greatly reduced due to the financial crisis, the annual output value of the existing 1000t/d molybdenum concentrator will be The preliminary estimate is still able to increase the annual output value by 10.651 million yuan, which is 35.81% higher than the original factory output value. references [1] Zhu Jianguang, Zhu Yushuang. The chemical principle of mineral processing chemicals (revised edition) [M]. Changsha: Central South University Press. 1996. [2] Zhu Yimin. Molybdenum ore flotation agent [J]. Foreign metal ore beneficiation, 1998, (3): 45-47. Can Sealing Machine,Beverage Can Sealing,Soda Drinking Can Sealing,Beer Can Sealing Machine Jiangsu Hanmo Tecchnology Ltd,.Co , https://www.jshanmotecho.com