What operational techniques should be mastered in the flotation test?

The flotation test generally consists of grinding, slurrying, flotation (bubbling) and product processing. Correct and skillful mastery of these operating techniques can enable the test to proceed normally and ensure the accuracy of the test. (1) Grinding. First, the mill is idling for a few minutes to clean, then add a part of the water required for grinding, add the ore sample and the agent that should be added in the grinding, and then add the remaining part of the water. When grinding, pay attention to whether the grinding machine's rotation speed is normal, but also pay attention to whether the sound is normal, to determine whether the ball or rod is moving normally in the grinding machine, and to accurately control the grinding time. When pouring the slurry, place the ball screen on the ore container. Rinse the inner wall and bottom of the mill with a stream of fine water, pour the slurry into the ore container, lift the ball screen, and rinse with the water. Finally, fill the mill with water and cover it for reuse. The ball press should pay attention to the amount of water when cleaning, so as not to accommodate the flotation tank. If the water is excessive, after clarification, the water can be extracted with a suction ear or a siphon as the additional water during the flotation: (2) Stirring and mixing. The purpose of the agitation is to suspend the mineral particles and bring the ore particles into effective contact with the bubbles. Pulping is the agitation after dosing and before the addition of air, in order to evenly disperse the agent and interact with the ore. The addition of the aqueous solution can be carried out using a pipette, a measuring cylinder, a measuring cup or the like. Water-insoluble agents, such as No. 2 oil, oleic acid, etc., are directly added by a syringe, but the actual mass of each drop of the drug is determined in advance. The method is to drop dozens of drops of the drug in a small beaker (known mass), and then weigh out the mass and divide by the number of drops, that is, the weight per drop. (3) Flotation scraping. According to the flotation process, the appearance of foam size, color, imaginary, toughness and brittleness is observed. By adjusting the amount of foaming agent, the amount of aeration, the level of the slurry, and the strict operation, the quality of the foam and the amount of scraping can be controlled. The amount of inflation is adjusted by the opening of the control valve and the speed of the flotation machine. After the amount of inflation is determined, it should be fixed. So as not to affect the comparability of the test. The thickness of the foam layer of the laboratory flotation machine is generally controlled at 25.50 mm, and the slurry cannot overflow from the flotation tank by itself. Due to the continuous scraping of the foam, the slurry level drops, and to ensure the continuous scraping of the foam, the water should be continuously added. If the pH value of the slurry has little effect on the flotation, tap water can be added. Otherwise, it should be formulated with additional water equal to the pH of the slurry. The foam adhered to the wall of the flotation cell must be flushed into the tank frequently. At the beginning and end of the foaming, the pH and temperature of the slurry must be determined and recorded. After the flotation is completed, the tailings are poured out and the flotation machine is cleaned. (4) Product processing. Flotation products should be dehydrated, dried, weighed, and sampled for chemical analysis. If the product is very fine or contains a lot of mud, a coagulant can be added to accelerate the settling. When drying the sulfide ore, the temperature should be controlled below l IO~C to prevent oxidation and change the product grade.

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