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Click to add WeChatLaterite nickel is one of the main mineral resources for obtaining nickel. It has large reserves and is easy to mine. In the process of beneficiation, the common lateritic nickel beneficiation processing methods include fire treatment and wet treatment. Among them, the wet treatment process obtains Nickel has lower energy consumption, less pollution, and the recovery rate of nickel is also higher. At present, nickel ore wet treatment processes can include pressure acid leaching, normal pressure acid leaching, normal pressure + high pressure combined acid leaching, and reduction roasting-ammonia leaching. The following editor will focus on these methods. Introduction to help everyone understand more about the nickel ore wet beneficiation process.
The pressured acid leaching method is suitable for processing high limonite content and low magnesium content 's laterite nickel ore. First, the laterite nickel ore is finely ground and adjusted into a stable concentration slurry, and then dilute sulfuric acid is used to leach nickel, cobalt, iron, aluminum, silicon and other minerals in the laterite nickel ore under high temperature and high pressure. Iron, aluminum, and silicon minerals are precipitated at different pH values, and nickel and cobalt minerals enter the leach solution. The cobalt and nickel minerals are then precipitated using the reduction method to obtain concentrate products. The use of pressurized acid leaching to treat laterite nickel ore can achieve better cobalt and nickel recovery rates, but it has higher requirements for the mineral composition of raw laterite nickel ore, which is greatly affected by the nickel grade of the raw ore.
Normal pressure acid leaching method to treat laterite nickel ore Similar to pressurized acid leaching. The process is as follows: after crushing the laterite nickel ore and pulping, the pulp, washing liquid and sulfuric acid are heated and reacted according to a certain proportion. The nickel and cobalt in the ore are leached into the solution, and then neutralized and filtered using calcium carbonate, and then calcium oxide or calcium oxide is used. Sodium sulfide precipitates nickel and cobalt in the leach solution. The normal pressure acid leaching method consumes less energy, has a simple process, low equipment cost, and is easy to operate and control. However, there is a problem of leachate separation, and nickel is easy to remain in the leaching residue.
Normal pressure-high pressure two-stage acid leaching treatment of laterite nickel ore can be used for ores containing different magnesium contents in an ore body. . The acid leaching process will produce excess acid after treatment, and neutralization treatment is required in the later purification process of the leachate. This will have varying degrees of impact on subsequent impurity removal operations. Xinhai Mining is equipped with normal pressure acid leaching and high pressure acid leaching. Based on the two leaching processes, a two-stage leaching process was studied, using a combined process of atmospheric pressure leaching and high-pressure acid leaching to treat laterite nickel ore. Its main purpose is to neutralize the excess acid in the leachate, thereby removing part of the ferric iron. The free acid can be neutralized by adding low-magnesium minerals to the normal-pressure acid leaching solution of high-magnesium laterite nickel ores for a second-stage high-pressure acid leaching.
Reduction roasting - ammonia The leaching method was used early. The laterite nickel ore is dried and crushed, mixed with coal powder and lime, and then subjected to reduction roasting. The nickel oxide and cobalt oxide are reduced to metallic nickel and metallic cobalt. The roasted ore is treated with NH3 and CO2 is used for ammonia leaching, and the leach liquid is sulfurized to precipitate cobalt in the form of sulfide. The leach liquid is evaporated with ammonia to obtain basic nickel carbonate, and then calcined to obtain nickel oxide. The reagents of the reduction roasting-ammonia leaching method can be recycled, which reduces the consumption of reagents. Both the metallic nickel and metallic cobalt in the ore can be recovered, but the leaching rate is low and the cobalt is easily lost during the process.
The above are several common laterite nickel ore wet beneficiation processes. With the prospect of continuous development of nickel ore resources,and is one of the materials for new energy batteries. The efficient development and utilization of laterite nickel is of great significance. However, in actual mineral processing plants, due to the different laterite nickel ore resources and different ore compositions, the selection of mineral processing methods should be scientific and reasonable. Here, the editor recommends that all factory owners conduct nickel ore beneficiation tests first. , design a suitable laterite nickel beneficiation process based on analysis.
Xinhai Mining is a mining enterprise that can provide services throughout the mining industry chain. It can conduct mineral processing tests on various nickel ores, and design suitable mineral processing processes and mineral processing plant construction plans for them. a href="/ore/nickel" target="_self">Complete sets of nickel ore beneficiation equipment and concentrator plant construction, equipment installation, commissioning and operation. If you have any needs, welcome to consult, service hotline: 15311826613!
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