How to control grinding?
Grinding fineness is the primary factor in flotation tests. For the grinding fineness test, the flotation test must be used to determine the optimum fineness. In the test, the washed ball is first put into a clean ball mill , then added with water, and finally ore is added. The amount of water must be strictly controlled when cleaning the mill. The laboratory uses batch open-circuit grinding, and the particle size characteristics of the grinding products are inconsistent compared with closed-circuit grinding. In order to avoid over-grinding, when the laboratory opens the mill to grind the fragile ore, the closed-circuit grinding can be used. This article can be used as a technical guide for practitioners related to “grinding†and can also provide reference for administrative and technical management personnel of mining enterprises. Grinding fineness is the primary factor in flotation tests. For the grinding fineness test, the flotation test must be used to determine the optimum fineness. In the test, the washed ball is first put into a clean ball mill, then added with water, and finally ore is added. It is also possible to leave a part of the water added at the end, but it is not possible to add water after adding the ore first, which will cause the ore to adhere to the end without being easily ground. When grinding, pay attention to whether the grinding machine's rotation speed is normal and accurately control the grinding time. After grinding, the mill is tilted, and the inner wall of the mill is washed with a fine water stream by washing the bottle or the rubber tube connected to the faucet, and the ore is washed into the ore container. For the grinding machine without the ball screen, a ball screen should be placed on the ore container to separate the steel ball. After the inner wall of the grinding machine is washed, the ball screen is lifted and the ball is shaken. Rinse the ball until it is washed, and finally return the ball to the mill for the next use. For the ball mill with its own ball screen, when discharging, the cone body is inclined to the discharge end, the discharge port is opened, and the slurry is placed in the ore container. Remove the feed port plug, introduce clean water, and disconnect the car and rinse. The amount of water must be strictly controlled when cleaning the mill. If the amount of water is too much, the flotation machine can not be accommodated, and it needs to be clarified and then withdrawn by a syringe or siphoned to remove excess slurry water, and it is used for supplemental water when flotation. The laboratory uses batch open-circuit grinding, and the particle size characteristics of the grinding products are inconsistent compared with closed-circuit grinding. In the grinding circuit that is closed to the classifier, the higher density minerals are finer than the rest of the minerals. How to reduce the above differences needs further improvement. In order to avoid over-grinding, when the laboratory opens the mill to grind the fragile ore, the closed-circuit grinding can be used. The method is that after the raw ore is milled for a certain period of time, the product of the specified size is screened out, and the product is sifted on the sieve, and the amount of water in the grinding is added according to the weight of the product on the sieve and the grinding concentration at the time of grinding the ore. The total time of the closed-circuit grinding is equal to the time required to open the grinding mill to the specified size. For example, a non-ferrous metal ores multiple, with open and imitation grinding conditions and closed-circuit grinding processes did comparative grinding tests. With open-circuit grinding, the content of -20μm in grinding products accounts for 47.2%, while the imitation closed-circuit grinding, -20μm only accounts for 31.6%, and the degree of mud is significantly reduced.
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