Tungsten ore beneficiation method

Most tungsten deposits are low grade ore. The ore grade of tungsten mines in China was about 0.5% WO3 in the 1950s, and some reached 0.7WO3, and dropped to 0.25-0.33% WO3 after the 1970s.

The foreign tungsten ore grades are up to 1% WO3, such as the Canton tungsten mine in Canada.

Different types of ore are sorted by different beneficiation methods and beneficiation processes. The main beneficiation methods of the black tungsten ore are described as follows: Beryllite ore (equipment):

First, pre-selection enrichment: Most black tungsten mines have a high depletion rate of mining, often above 80. It is extremely important to pre-empt the coarse and poor waste rock before re-election.

China's black tungsten ore dressing plant, according to the boundary between the ore-bearing gangue and the surrounding rock is clear, the color is clear, easy to distinguish, the ore is washed and classified, and a large amount of waste rock can be discarded by artificial hand selection.

In particular, the narrow-scale backhand selection of coarse-grained ore can improve the picking efficiency. The hand-selected waste rock rate is generally 50%, the high is 70%, and the low is about 35%.

The selected waste rock grade is 0.015-0.04%. The proportion of tailings selected by WO3 is low, and the recovery rate of the operation is 96.5 to 99%.

Heavy media beneficiation 70 years has invested in eastern Hunan, and Tong Yang Hongling three tungsten mineral processing plant, with pyrite as a weighting agent, were selected in the cyclone and turbo separator carve, have achieved good technical and economic index.

For example, the Xiangdong tungsten mine is combined with heavy selection and heavy ore dressing. The selection rate of waste rock is increased from 43% of the original single hand to 57%, and the cost of mineral processing is reduced by 5-11%.

The selection rate of waste rock in Yangtang Concentrator increased from 40% to 53%, and the cost of mineral processing decreased by 8.1%.

The selection rate of waste rock for vortex sorter in Hongling Concentrator is 50-59%, and the cost of ore dressing is reduced by 2.3%. Later, due to the depletion of heavy resources or the loss of the history of the associated gold , the heavy medium beneficiation of several tungsten mines was suspended.

Photoelectric picking is sorted according to the color difference between the ore-bearing gangue and surrounding rock. Several models of photoelectric picking machines have been developed by Zhangzhou Nonferrous Metallurgy Research Institute, Dajishan Tungsten Mine and Yaogangxian Tungsten Mine. Heavy processing of 20 to 40 mm ore can replace some manual hand selection.

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