Scheelite Branch Flotation at Normal Temperature

The base reserves of wolframite account for 70.4% of the China's tungsten base reserves. In general, the quartz or silicate minerals are more easily selected in the vein rocks. The scheelite calcite and the scheelite fluorite (barite) ores are more difficult to separate because of the floatability of the minerals, there are still a large number of fine particles in the scheelite coarse concentrate. Gangue minerals such as calcite and fluorite are more similar to scheelite than those of collectors, they are difficult to separate.

The flotation process of scheelite can be divided into two types: Scheelite branch flotation at normal temperature and high temperature flotation. A large number of wolframite concentrate containing calcite and fluorite is concentrated, and a large amount of water glass is added. The strong stirring is carried out for 30 to 60min under the high temperature above 80°C, then diluted at the normal temperature. The ore is more adaptable to the ore, but the mineral processing cost is high and the labor conditions are poor. With the synergistic effect of glass, under the condition of adding a large amount of water glass, after a long time (> 30min), the coarse concentrates are diluted and selected.  The beneficiation cost is low, but the separation effect of the ore is poor.

On the basis of normal temperature flotation, some scholars put forward a scheelite flotation method at room temperature.

(1) The flotation of carbon and sulfur is carried out by adding water to the ore by mass ratio of 1:1 to water, adding kerosene A20 to 30g and sulphide collector b40 to 50g by adding kerosene to qualified granularity, adding kerosene A10 to 15g and sulfide collector B20 to 25g to carry out sulfur coarse selection II, get sulfur coarse selection of sulfur coarse selection II sulfur coarse middle ore and sulfur coarse selection II No sulphur concentrate and sulfur concentrate concentrate were selected for sulphur crude separation, and sulphur concentrate and sulfur concentrate middling 1 were obtained.

With the coarse selection of the scheelite branch, the sulphur coarse selection II tailings selected by step A are divided into a tributary and two branch flow after the slurry distribution trough is given to the slurry. A slurry of tributaries is entered into the mixing tank I, adding sodium carbonate c400 to 500g to adjust the pH value to 8 ~ 8.5, adding modified water glass d800 to 1000g, and 731 oxidized paraffin soap E200 to 240g, after stirring and mixing the slurry. Tungsten coarse selection I, adding sodium carbonate C200 ~ 250g, adding modified water glass D400 to 500g, adding 731 oxidized paraffin soap E100 to 120g to carry out tungsten coarse selection II, obtained tungsten coarse selection I and tungsten coarse selection II tungsten coarse middle ore and tungsten coarse selection II tailings, tungsten coarse selection II tailings added 731 oxidized paraffin soap E50 to 60g for tungsten coarse sweep. The coarse sweep of tailing and tungsten coarse selection I was in the middle mine. The coarse sweep of tungsten coarse cleaning and then 731 oxidation paraffin soap E50 ~ 60g was used to sweep the tungsten coarse scavenging II. Selected I medium ore, tungsten coarse selection of tungsten coarse selection II, get tungsten coarse selection II, get coarse concentrate and tungsten coarse selection II middle mine 3, branch two pulp into mixing tank II, adding sodium carbonate c400 ~ 500g to regulate the pH value to 8 ~ 8.5, adding modified water glass D600 to 800g, 731 oxidized paraffin soap E160 to 200g, after stirring and mixing the slurry into the slurry tungsten coarse selection tailings, tungsten coarse selection 6, tungsten coarse selected tailings and 731 oxidized paraffin soap E40 ~ 50g for tungsten coarse scavenging I have been obtained, tungsten coarse scavenging I tailings and tungsten coarse scavenging I were selected and 731 oxidized paraffin soap E40 to 50g were added to tungsten coarse scavenging, and the tailing one and the tailings two are discarded.

At normal temperature selection of scheelite, the pH value of sodium carbonate c400 to 500g is 9 ~ 9.5 by adding sodium carbonate with sodium carbonate, the modified water glass D500 ~ 600g is added to the tungsten fine coarse selection. The tungsten fine coarse selection middle ore and tungsten concentrate coarse tailings are obtained. The tungsten fine tailings are added to the tailings of tungsten refined coarse selected tailings by adding 731 oxidized paraffin soap E40 to 50g, the tungsten fine cleaning is selected to get tungsten fine sweep selection I. tungsten concentrate 7 and tungsten concentrate to sweep the tailing. Tungsten fine scavenging is selected and 731 oxidized paraffin soap E40 ~ 50g are added to the tungsten fine sweep II, and three of tailings and 11 tungsten concentrate are obtained. Tungsten selection I concentrate II, tungsten selection II concentrate and tungsten selection II middling 8, tungsten selected II concentrate adding modified water glass D50 ~ 60g for tungsten selection III, tungsten selected III concentrate and tungsten concentrates 9, tungsten selection III middle mine 9 without any agent of tungsten selection IV, tungsten concentrate And tungsten selected IV middling 10, the tailings three discarded.

The advantages of the branching flotation method at normal temperature of scheelite lie in: 1. It can reduce the consumption of flotation agents and improve the separation index. 2. Selective flotation at normal temperature, simplify the process of scheelite selection, avoid the loss of scheelite at the time of dehydration, ensure the recovery of scheelite, simple process and easy to implement. 3. WO3 grade of scheelite concentrate > 75%. The recovery rate is more than 80%.

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