lime The effective component of lime is CaO, which is obtained by calcining limestone at 900-1200 °C. Lime has strong water absorption, and when it reacts with water, it becomes calcium hydroxide with little solubility and generates a large amount of heat, and its aqueous solution can further ionize calcium ions (Ca2+) and hydroxide. The slaked lime reacts with CO2 in the air to form CaCO3, which is fouled in the bottom of the machine and in the pipeline. Lime has many functions in flotation operation. The addition of lime is usually carried out by adding lime powder to the ore belt of the ball mill or adding lime milk or lime powder to the stirring tank before the flotation. Lime is an inexpensive adjusting agent, an inorganic inhibitor and an electrolyte, which can adjust the PH value of the slurry is increased hydrophilicity, so that the pulp of the heavy metal ions OH- form insoluble hydroxide the collector The proportion of the agent in the molecular or ionic state changes in water, that is, the degree of dissociation is changed, and the rejection hinders the adsorption of the collector anion on the mineral surface, directly affecting the degree of hydrolysis of the inhibitor, and is proportional to the starting ability of the foaming agent. The formation of poorly soluble compounds with harmful ions from ores, water and chemicals in the slurry precipitates, eliminating its effect on flotation. The addition of lime during the flotation process can change and adjust the floatability of various minerals because of the critical pH of the minerals that float or not. It can act to disperse or agglomerate the slurry. A selected plant floatation altered rock gold ore, the concentrate grade is not up to the sales requirements, the PH value is raised from 7 to 8.5, the gold concentrate grade is as high as 25 g / ton, and achieved significant operational benefits. Lime can inhibit the flotation of iron sulfide minerals and natural gold particles. The use of lime to inhibit iron sulfide minerals, such as pyrite, ferrous ore, pyrrhotite or sulphur arsenite , is one of the main methods commonly used in production practice. Yellow copper ore, galena, sphalerite often associated with a pyrite ore, iron ore sulfur arsenic for better floating copper, lead and zinc minerals, lime necessary to suppress iron sulfides, is suppressed when When the content of iron sulfide mineral is relatively small, the pH value of lime can be adjusted to above 9 or higher. When the content is relatively high, the pH value can be adjusted to above 11 by using lime. Lime lead ore, especially galena with slightly oxidized surface, also has a certain inhibitory effect. Therefore, when galena is floated from a polymetallic sulphide ore, the pH is generally adjusted with sodium carbonate instead of lime. When the high content of pyrite must be suppressed by lime, attention should be paid to controlling the amount of lime to minimize the influence of the lead. For the treatment of gold-bearing polymetallic sulfide minerals with high content of valuable heavy metals, mixed flotation and separation flotation + concentrate cyanidation process are used. When flotation, the pH value is adjusted to 7-8 with lime, so that most of the useful sulfide minerals are floated. Then adjust the PH value to 10-12 for separation and inhibit pyrite. Natural gold particles are susceptible to inhibition by Ca2+ because CaCO3 precipitation inhibits the flotation of natural gold particles. The effect of lime on the flotation process is mainly reflected in the effect on the properties of the flotation foam. Lime itself is a coagulant that can make the slime gather and, to a certain extent, eliminate the harmful effects of the slime on the adhesion of the ore. When the amount of lime is appropriate, the foam can be maintained at a certain viscosity with appropriate stability. If it is severely excessive, it will cause the fine particles to condense in the foam, make the foam stick and expand, and even run the trough, resulting in chaotic operation, decreased sorting index, and the phenomenon of flocculation and slime is intensified. Due to lack of selectivity, the foam concentrate is often Entrained with a large amount of ore fine mud, affecting the quality of the concentrate. Lime is an inorganic electrolyte, and the dissociated Ca2+ ions are adsorbed on the surface of the slime to reduce or neutralize the negative charge on the surface of the slime, so that the fine particles can be agglomerated into larger agglomerates under the action of van der Waals force, thus many mines in actual production. It is added to the flotation concentrate concentration tank to accelerate the sedimentation of the slurry, optimize the concentration and filtration operation, prevent the running of the concentrate and so on. 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