Tailings

Tailing Disposal Methods and Tailings Dam Construction Design

As there is seldom enough ground available on which the tailing of a flotation plant can be run to waste without being stacked, it is usual to impound it in some form of dam where the solids can be deposited and the water decanted off for return to the plant. It is generally advisable to recover as much of the water as possible in order not only to save the expense of obtaining a fresh supply but also to return to the flotation circuit any reagents that it still contains in solution. Assuming that it is necessary to return the water to the plant, it is best to dispose of the tailing pulp in two stages, dewatering it in a thickener close to the plant before sending it to the dam, which can seldom be near and often has to be a considerable distance away. This method keeps at a minimum the cost of pumping, which is the heaviest item of expenditure.guidelines on tailings dam design construction and operation

Tailing Thickeners

In modern practice the first stage of dewatering is generally carried out in a Traction Thickener, which is of the same ….Read more

Pyrite Tailings Recovery by Flotation

Pyrite has long been used as a source of sulphur, and its recovery as a by-product from the flotation of certain base metal ores is a well established practice. Large tonnages of mill tailings which have accumulated as a result of various milling operations frequently contain significant amounts of pyrite. In many instances these tailings can be treated to yield pyrite concentrates that are a suitable source of sulphur dioxide for the manufacture of sulphuric acid. Such concentrates must normally contain at least 48% sulphur.

The Pyrite Tailings Flotation Circuit FlowsheetPyrite Recovery from Mill Tailings

Initial treatment of the tailings preparatory to pyrite recovery depend upon the source and particle size of the material to be treated. Fine material, such as flotation tailings, normally does not require size reduction prior to pyrite flotation. On the other hand, coarse tailings such as those produced from certain gravity concentrating operations, must be ground to provide a product suitable for flotation. This study deals with various types of tailings and subsequent treatment methods.

FINE TAILINGS

Fine tailings may be either mined dry and transported to the mill by truck or they may be mined hydraulically and the resulting pulp pumped to ….Read more

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