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Click to add WeChatThe daily processing capacity of a certain copper-nickel sulfide mine is 1,500t. Since the establishment of the dressing plant, the flotation process has been used to separate nickel concentrate, and the tailings are directly discarded. However, due to the old process plan in the early stage, the equipment is not advanced. , resulting in a certain amount of nickel resources (containing 0.3% to 0.5% nickel) in the tailings.
In order to further increase the nickel ore resources, it was decided to re-separate the tailings of the concentrator. Through the beneficiation test analysis of the nickel tailings, a process for re-separating and recovering nickel was designed. Process, let’s take a look at the solution together.
The average grade of the nickel raw ore, Ni1%~1.5%, Cu0.3%~0.4%, copper-nickel ratio is 1:3.5. The main metal sulfide minerals are pyrrhotite, pentlandite, pyrite, chalcopyrite and pyrite. Sulfide ore accounts for about 20% of the total ore, among which pyrrhotite accounts for more than 60% of the sulfide ore. The ratio of pyrrhotite to pentlandite is about 6.3:1.
The gangue minerals are mainly clinopyroxene, but most of them have been talcized and amphiboleized, accounting for about 40%. In addition to the presence of nickel in the pyrrhotite isomorphism, there is also a part of pentlandite embedded in a flame-like structure. Most sulfide minerals can be separated from gangue minerals when they are ground to -74μm and account for 70%.
Through experimental analysis, the designed re-selection process is: two stages of rough separation and one concentration. Process, the tailings are directly pumped into multiple spiral chutes for roughing, and 2 roughing concentrates are used The spiral chute is used for beneficiation, and the concentrate is returned to the original flotation process to continue flotation, while the gravity-selected tailings are returned to the gravity-selection roughing section. The roughing tailings are discharged into the tailings pump pool, and then pumped to the tailings. Mine Dam.
The nickel tailings re-selection Part of the equipment used is mainly 16 BL1500-B spiral chutes arranged on a working platform 2m above the ground. There is a total ore separator above the 14 roughing spiral chutes to distribute the ore to each spiral chute, and 2 fine selection spiral chutes. There is also an ore divider above the spiral chute. The coarse concentrate is directly discharged into the coarse concentrate pump pool located below the platform. The pump drives it into the selection spiral chute. The rough concentrate tailings are directly discharged into the large tailing tank next to the platform. In the mine pump pool, the pump discharges directly to the tailings dam. The concentrate and tailings from the selected spiral chute are discharged into the pump pool below the working platform respectively. The pump pumps the concentrate back to the flotation process, and the selected tailings are pumped into the roughing total separator. The entire civil engineering project only used channel steel to build a 10m×10m working platform. No factory building was built, and the equipment was operated in the open air. A tailings pump pool and pump room were built next to the platform. The entire project is relatively simple to construct, saves investment, and is fast to construct.
The nickel ore beneficiation plant had a poor foundation in the early stage, resulting in the loss of some nickel resources, and later passedOre dressing test analysis, after designing a new remediation plan, the recovery rate of nickel concentrate is effectively improved. Therefore, in the ore dressing operation, the ore dressing test is done in advance, and based on the test analysis It is necessary to design a reasonable mineral processing process plan. This is an effective way to improve the recovery and reduce investment of the mineral processing plant.
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