The slurry temperature often plays an important role in the flotation process and is also an important factor affecting flotation. Adjusting pulp temperature conditions mainly from two requirements: First, the nature of the agent, some agent which can play an effective role to be at a certain temperature; Second, some special process is required for the purpose of improving the temperature of the slurry was divided mineral.
(1) Non-sulfurized ore-frozen flotation In the practice of non-sulfurized ore flotation, when some insoluble solvents (such as fatty acids and fatty amines) whose solubility changes with temperature are used, the temperature of the slurry is increased. They can increase their solubility and absorbency, often reducing drug consumption and increasing recovery.
When flotation of fluorite with a fatty acid collector, the flotation specification is closely related to the slurry temperature. Tests have shown that slurry temperature will have an effect on fluorite flotation in the range of 5~35° pulp temperature.
The amount of oleic acid has the following functional relationship with the temperature of the slurry:
Y=1110-27x
Where y———the amount of oleic acid, g/t;
x———Pulp temperature, °C.
To obtain the same beneficiation index (concentration grade 89.36% ± 1.04%, recovery rate 96% ± 1.30%), when the pulp temperature is 5 ° C, the amount of oleic acid needs to be as high as 1000 g / ton, at a temperature of 35 ° C, The amount of oleic acid used is only 250 g/t.
In addition, the "Peter Rof method" selected from the white tungsten coarse concentrate is the process of selecting the desorption of water glass in the high-concentration concentrated pulp to improve the separation of white tungsten and calcite and fluorite.
(B) In a sulfide ore flotation warmed xanthate flotation multiple metal sulfide ore, the bulk concentrate was warmed to a certain temperature, the surface may cause desorption mineral collector, strengthening inhibition, The problem that the multi-metal mixed concentrate is difficult to sort at normal temperature is solved. The essence of warming flotation is to exploit the difference in oxidation rate of various sulfide ore surfaces and to expand the difference in floatability of minerals to be sorted. The currently used sulphide ore heating flotation has the following various methods.
Heating copper flotation separation of copper - lead mixed concentrate (1) direct slurry heating method;
(2) SO 2 slurry heating method;
(3) sulfurous acid-steam heating method;
(4) Sulfuric acid-slurry heating method.
The effect of slurry warming in the above process is mainly considered to be selective desorption of the collector on the surface of the galena, and the surface is oxidized and hydrophilic, in the presence of inhibitors (SO 2 , H 2 SO 3 and H 2 SO 4 In the presence of, etc., further strengthen the inhibition of the lead ore, so it can improve the separation effect of copper and lead flotation.
B. Heating-flotation separation of copper- molybdenum mixed concentrate (1) sodium sulfide-steam heating method;
(2) lime-steam heating method;
(3) cyanide heating method;
(4) Combination drug (NaHS/Na 2 SO 3 + NaCN) - slurry heating method.
In the above process, the effect of slurry warming mainly enhances the selective desorption of the collector on the surface of the copper mineral and promotes the inhibitory effect of the inhibitor on the copper mineral. Therefore, the effect of copper-molybdenum separation flotation can be effectively improved.
Heating separation flotation of copper- zinc mixed concentrate (1) natural oxidation-hot water flotation method;
(2) Lime-steam heating method.
The above process is suitable for copper-suppressing zinc. The slurry heating is beneficial to the desorption and surface oxidation of the copper mineral surface collector, while the zinc mineral is activated by copper ions and is not easily inhibited. Therefore, the heated pulp is beneficial to the copper-zinc separation.
Although the heating flotation process has many advantages, there are still some technical problems. In practice, attention should be paid to and further resolved.
(1) To prevent the vicious circle of the middle mine. Lime-steam heating method or other inhibitor heating method has stronger inhibitory effect on minerals, but the heating method without adding chemicals mainly relies on selective desorption, so the inhibitory effect on minerals is weak. Therefore, a large number of intermediate ore cycles are often caused. In order to reduce the circulation of the mine, the temperature of the slurry should be strictly controlled. For example, the temperature of the selected and sweeping operations should be slightly higher than the roughing temperature.
(2) Attention should be paid to improving working conditions. As the slurry is warmed, the temperature of the plant will increase, and water vapor and drug decomposition products (such as CS 2 ) will increase. Thus the working conditions are deteriorated.
(3) Pay attention to mechanical lubrication and corrosion protection. Due to heating, the flotation machine is heated, the bearing lubricant will melt out, and high temperature grease should be used instead of butter to prevent the lubricant from flowing into the slurry, damage the flotation unit and destabilize the flotation process.
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