Mining And Milling Methods for Graphite Ores Process

There are four methods of concentrating graphite ores process, water "skin-flotation," the pneumatic process, the log-washer process, and oil-froth flotation. There are many machine which are convenient for mining . Different mining excavator for your choosing:http://www.ecvv.com/product/Machinery-Equipment.html

The extent to which these various processes are used in graphite ore is as follows, the figures including plants that contemplate putting in those systems under which they have been classified: The skin flotation washer system is used in twelve and one-half plants. One of the plants consists of two units, one of which is the Minerals Separation oil-froth flotation. The pneumatic system is used in three plants, the log-washer system in two plants, and oil-froth flotation systems in twenty-one and one-half plants.

The experiments proved fairly conclusively that the use of either the electrostatic separator or the pebble mill, followed by flotation, will be applicable to all types of concentrates produced in the graphite fields. Material produced by either of these types of apparatus can be ground in the buhr mill with satisfactory results.

The different processes of finishing graphite process may be classified under two general heads wet and dry processes. The decision as to which of the two should be used is dependent on the characteristics of the concentrates themselves. It is important that neither be adopted except after the necessary experiments and on the advice of an engineer thoroughly conversant with the problems to be encountered in the treatment of the particular concentrate in mind and with the economic conditions that will exist in the plant.

It can be said that with rare exceptions a satisfactory crucible stock can be produced from all of the concentrates that are at present made from the graphite ores, and that the recovery of 100 mesh flake at the majority of finishing plants now operating can probably be improved. It should be possible to keep the recovery of material coarser than 100 mesh at 70 percent of the total carbon in the original concentrates, and in many instances this can be increased to 80 per cent or more. These figures are sufficiently high to make profitable many of the plants that are not now operated except at a loss.

In conclusion, it should be emphasized that the results obtained in finishing the crude graphite concentrates are dependent largely on the character of the crude flake itself as contained in the ores. Moreover, mills that are producing a concentrate containing large tough flake in their concentrating plants, can also produce a satisfactory crucible stock at a profit from a finishing plant which has been correctly designed and intelligently managed. The operator who is unfortunate in having to mine small, low-grade flake requiring a large amount of intensive grinding, and which is associated with a large quantity of coarse siliceous or micaceous impurities, is bound to have difficulty in producing the required grade of crucible stock at a profit.

As in all mining ventures, success or failure depends more on the character of the raw ore than on the treatment given the graphite ore plant after it has been mined.

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