Understanding of copper-molybdenum separation process

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.

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 (25125%), followed by molybdenum (8118%). The higher precious metal content 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.

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 impurity in the leaching solution, easy purification and recovery of molybdenum, and (3) leaching The agent has a wide range of sources, low prices, and the 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.

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.

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.

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, soda ash dosage is the theory. 175% of the test results: the molybdenum slag contains Cu27.93%, Mo0.41%, Au13.8g/t, Ag144g/t; the copper immersion liquid contains Cu14.86g/L; the immersion molybdenum solution contains Cu0.007g/ 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 gold and silver, etc. Valuable elements can be priced when the concentrate is sold.

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.

Screw Pile Driver