The similar flotability of scheelite, fluorite, and calcite resulted in the difficult separation by flotation. This work revealed the effect of water glass. Hence, a novel flotation process was developed for the recovery of tungsten minerals. The process is simplified greatly, and the recovery is. In our-plant scheelite is recovered by soar flotation with caustic soda, water glass and oleic acid. Rougher flotator froth is separated into table concentrate and.


Author: River Walsh III
Country: Austria
Language: English
Genre: Education
Published: 8 November 2016
Pages: 463
PDF File Size: 2.23 Mb
ePub File Size: 28.84 Mb
ISBN: 981-6-80278-295-3
Downloads: 42185
Price: Free
Uploader: River Walsh III


In Julythe tungsten flotation concentrate launder was installed and the improvement in sulphur recovery was immediate.


At a feed density of 1. The results confirmed that the new froth launder had been successful in improving coarse sulphur mineral tungsten flotation. Since Octoberthe BSF circuit upgrades has improved the tungsten recovery by a further 2.

The recovery of the coarse rich sulphur particles has resulted in an improved sulphur tungsten flotation. The overall sulphur mineral recovery has increased by 4.

Tungsten Metallurgy

This is true both with regard to the particular ore which is being treated and the particular reagents selected. The optimum proportions of each of the reagents used, however, can be readily determined in accordance with the particular combination being used and the characteristics of the ore to be treated.

In addition to the naturally occurring low grade tungsten ores there is also available considerable amounts of discarded material from beneficiation processes which have been carried out on relatively high grade ores.

These discards may take the form tungsten flotation table tailings or tailings from previous flotation processes.

Improved recovery, reliability and wear after flotation upgrade at Nui Phao, Vietnam

Since this discarded material represents a good proportion of the original content of tungsten in the ore it is desirable if possible to recover at least a portion of it. Tungsten, itself, can be refined from these low grade materials by chemical processes.

The necessity for maintaining this excessive capacity and the use of excessive amounts of chemicals makes the cost of processing the discarded material per se commercially tungsten flotation.

Not only is the process and reagent combination of the present invention capable of concentrating naturally occurring ores but its selectivity is great enough so that it may be advantageously applied even to these extremely low grade tailing piles.

By making use of the process and reagents of the present invention which are capable of producing 20 to The nature of the invention as well as the relative effect of the different reagent components will be illustrated by the following examples showing the treatment of samples from low grade tailing piles such as those mentioned above.

All parts are by weight unless otherwise noted. EXAMPLE 1 A number of samples of a tungsten ore table tailings from a Nevada ore containing scheelite, 75 calcite, pyrite, quartz and garnet having an average tungsten flotation of: Flotation of Tungsten Ores Flotation has a very important application in treating the more complex tungsten ores, particularly those containing sulphides.


Many of the tungsten ores contain pyrite, arsenopyrite, molybdenum, bismuth, copper, lead, and tungsten flotation minerals all of which tungsten flotation contaminate gravity tungsten concentrates.

It is, therefore, very important to remove these sulfides from the resulting gravity concentrates or from the ore prior to gravity treatment. This, however, precludes initial coarse gravity treatment and necessitates grinding the ore to flotation size for effective removal of the sulphides.


This reduces the size of the tungsten mineral so it becomes increasingly important to employ up-to-date and the best type equipment for gravity recovery of the tungsten fines after the sulfides have been tungsten flotation by flotation.

In addition to removing sulfides, flotation is becoming well established in the recovery of the slimed tungsten minerals. In some cases it has been found advantageous to simplify the flowsheet and go to all flotation treatment for tungsten recovery and resort to chemical treatment for final up-grading of the concentrate and removal of impurities in order to meet marketing specifications.

Where coarse jig concentrates are produced containing sulphides, it is necessary to crush or rod mill down to flotation size in closed circuit with a vibrating screen.

Plant Practice in Scheelite Flotation at Kamaishi Mine (2nd Report)

Batch treatment of tungsten concentrates in a Unit Cell has been very effective for sulphide removal. The cell in this case, is arranged for continuous circulation of the pulp within the machine and at the same time, a sulphide froth product can be removed which is very low in tungsten.

The unfloated tailings from the machine are dewatered, dried, and bagged as high grade tungsten concentrates or given tungsten flotation and chemical treatment in case other non-floatable impurities such as phosphorus may be present.