A place porphyry copper ore, copper reserves of large-scale and associated molybdenum, gold, silver and other helpful resources, copper, molybdenum disseminated fine grain size, and contains graphite, copper-molybdenum separation problem long-term is not resolved, not yet exploited. After in-depth study on the material composition of the mine, it is determined that the mine should not be finely ground to separate copper and molybdenum. Instead, the combined process of metallurgy should be used. The mineral ore should be properly sorted, and the concentrate should be separated by hydrometallurgy. And make the associated gold and silver be used effectively. First, the nature of concentrate The copper-molybdenum concentrate is obtained by flotation of the porphyry copper ore. The particle size is -0.045mm, accounting for 89.81%. The main metal in the concentrate is copper (25.25%), followed by molybdenum (8.18%). The precious metal content is higher (Au10.3g/t, Ag135g/t), and the remaining chemical components (%): S26.43, TFe18.90, Zn0.19, SiO 2 10.68, Al 2 O 3 4.06, CaO 1.12. MgO0.56, K 2 O0.74, Na 2 O0.56. The copper minerals in the copper-molybdenum concentrate are mainly chalcopyrite, followed by the porphyrite; the molybdenum ore is mainly molybdenite. Therefore, the development of copper and molybdenum separation and extraction technology must be considered in favor of the comprehensive recovery of gold and silver. Second, the selection of the test plan is determined The copper grade of the concentrate has reached the requirements of copper concentrate and can be directly into the furnace. However, under the conditions of pyrometallurgical smelting, molybdenum will volatilize and is inconvenient to recover; the copper in the concentrate is mostly chalcopyrite, the primary copper ore. It is not easy to directly leaching by wet process. Molybdenite is also a primary sulfide ore and cannot be directly leached. Therefore, in order to separate copper and molybdenum by wet method, the concentrate must be activated. The copper-molybdenum leaching effect and separation of roasting-sulfuric acid leaching, roasting-sodium carbonate leaching, roasting-sodium hydroxide leaching, direct leaching of sodium hypochlorite, etc. were studied, and the copper-molybdenum concentrate was decomposed by multiple schemes. It is known that the roasting-soda leaching scheme is a better experimental scheme. It has several advantages: (1) separation of copper and molybdenum in the leaching stage, (2) less impurities in the leaching solution, easy purification and recovery of molybdenum, and (3) source of leaching agent. Wide range, low price, and leaching process does not corrode equipment. Therefore, the selected roasting-soda leaching process is the main copper-molybdenum separation technology route, and the roasting ore can preferentially recover part of copper by water pre-dipping. This part of copper is simple in recovery process and low in cost. Third, the test process and results (1) Test procedure The test procedure is as follows: the copper-molybdenum mixed concentrate is calcined at a certain calcination temperature, the calcine is leached with water to partially etch copper, the water immersion liquid can be recovered by extraction-electrowinning process, the water leaching slag is further leached with sodium carbonate solution, and the molybdenum immersion liquid is immersed. The molybdenum can be recovered by precipitation or extraction, and the molybdenum slag can be used as a copper concentrate. (2) Test results In order to improve the leaching activity of the copper-molybdenum mixed concentrate, the sulphide ore in the copper-molybdenum ore is converted into an oxide or a sulfate by roasting, thereby being easily leached. After molybdenum ore is oxidized to molybdenum oxide, it can be dissolved in a soda ash solution, and the calcined copper-molybdenum ore is leached with a soda ash solution. The leaching process is accompanied by a reaction between copper sulfate and soda ash to form basic copper carbonate. 1. Effect of calcination temperature on molybdenum leaching effect Under the conditions of 3.07 times, 80 °C and 1 h of the theoretical amount of soda ash, the effect of calcination temperature on the leaching rate of molybdenum in copper-molybdenum mixture was studied. The fixed acid leaching conditions were: 80 ° C, 1 h, sulfuric acid concentration 5%. , L / S = 3, the test results are shown in Figure 1. It can be seen from Fig. 1 that the temperature rise is favorable for the leaching of molybdenum, but the partial burning temperature is above 650 ° C, and the volatilization of molybdenum oxide is gradually increased. If the copper in the molybdenum slag is extracted by wet method, the calcination temperature is from 600 to 700 ° C. With the increase of temperature, the leaching rate of copper decreases. When the temperature is higher than 650 ° C, the leaching rate of copper decreases significantly. Considering the leaching effect of copper and molybdenum two metals, the baking temperature should be 650 °C. 2. Effect of leaching temperature on molybdenum leaching effect Fixation conditions: calcination temperature 650 ° C, calcination time 1 h; leaching time 1 h, L / S = 2, the amount of soda ash is 31.7% of the ore weight. The effect of leaching temperature on the leaching effect of molybdenum is shown in Figure 2. It can be seen from Fig. 2 that the leaching temperature has a great influence on the leaching rate of molybdenum, and the temperature needs to reach above 80 °C in order to obtain a satisfactory leaching effect. 3. Effect of leaching time on molybdenum leaching rate The calcination temperature was 650 ° C, the time was 1 h, the leaching temperature was 80 ° C, the soda ash amount was 31.7%, and the relationship between the leaching time and the molybdenum leaching rate is shown in Fig. 3. The test results show that the leaching time has no significant effect on the leaching effect of molybdenum. Under suitable conditions of calcination temperature and soda ash dosage, the leaching rate of more than 90% can be achieved after 30-60 min, and the leaching time is prolonged. The leaching rate of molybdenum does not change significantly. 4. Test of pre-dip copper in roasting ore water The copper immersion copper is mainly leached by copper which is sulphated during the roasting process, and can be dissolved in water without any test. The test only compares the leaching effect at room temperature and 80 ° C. The test results show that the water immersion temperature has little effect on the leaching rate of copper. The leaching rate of copper at 80 °C (~24%) is slightly higher than the leaching rate of copper at normal temperature (~20%), simplifying the process as much as possible and reducing Cost considerations choose to use room temperature water immersion as well. 5. Test of soda ash dosage of leaching molybdenum from water leaching residue Under the condition of 80 ° C, leaching time 1 h, L/S = 2, the soda ash dosage test was carried out, and the test results are shown in Fig. 4. Comparing the test results of Fig. 1 and Fig. 4, it can be seen that the water leaching pretreatment can not only preferentially recover part of the copper by a simple method, but also can directly leaching molybdenum to reduce the amount of soda ash by about 50% without pretreatment, thereby making the immersion molybdenum. The cost is greatly reduced. This is because the copper sulfate in the calcined ore is converted into copper carbonate or basic copper carbonate to consume soda ash without being subjected to water prepreg. After water immersion, the soluble copper in the water leaching slag is reduced, and the soda ash is mainly consumed by the leaching of molybdenum, and thus the consumption of soda ash is decreased. Therefore, it is determined that roasting-normal temperature water immersion copper-soda leaching molybdenum is the main copper-molybdenum separation process of the copper-molybdenum ore. In summary, the optimum conditions for roasting copper-molybdenum ore are: 650 °C roasting for 30-60 min; room temperature water pre-soaking for 30-60 min, L/S=2:80 °C soda leaching for 30-60 min, L/S=2 The amount of soda ash is 175% of the theoretical amount. Test results: Molybdenum slag contains Cu 27.93%, Mo 0.41%, Au13.8g/t, Ag 144g/t; copper immersion liquid contains Cu 14.86g/L; Containing Cu 0.007g / L, Mo38.4g / L, molybdenum leaching rate of 96.05%. The molybdenum leached into the solution by soda ash can be recovered from the solution precipitate, and the copper remaining in the molybdenum slag can be used as a high-quality copper concentrate, and the copper preferentially leached with water can be recovered by an extraction electrowinning process. The copper and impurity components (Pb+Zn0.23%, MgO0.32%, Bi0.008%, As0.11%) in the molybdenum slag meet the requirements of the second grade of YS/T318 copper concentrate quality standard, and contain valuables such as gold and silver. The element can be priced when the concentrate is sold. Fourth, the conclusion The roasting-soda leaching separation and recovery process of a difficult copper-molybdenum mixed concentrate in a certain place was studied. After roasting at 650 °C, some copper was preferentially leached with water. This part of copper can be recovered by extraction-electrowinning process. The copper slag is leached with soda ash, and the molybdenum leaching rate is 96.05%. The molybdenum in the leaching solution can be recovered by precipitation. The recovery of copper in the molybdenum slag is 85.56%, and the molybdenum slag can be sold as a copper concentrate. 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