SU1496824A1 - Method of crushing ores - Google Patents

Abstract

The invention relates to the crushing of minerals and can be used in the process of enrichment of ores and non-metallic minerals. In order to increase the yield of the useful product, the method of crushing the ores includes feeding the material into a impact crusher, screening and returning the oversize product to the crusher with repeated repetition of the cycle, and after two or three cycles increase the speed of the crusher rotor 1.5-2 times. After the end of the circulation time, the rotor speed is reduced to its original value. The greater density of useful minerals (cassiterite and wolframite) is 2.6–2.8 times higher than the density of other hay minerals, along with the various strengths of these minerals, which leads to a high selectivity of crushing of tin and tungsten ores. By increasing the initial rotor speed to 60-80 m / s, good opening of useful minerals is achieved, and their content in the circulating product is reduced to the level of tailings. 1 ill., 1 tab.

Description

one

(21) 4222530 / 23-33

(22) 04/06/87

(46) 07/30/89. Bul N 28 (75) P.I.Pankov

453) 621.926.9 (088.8)

(56) USSR Author's Certificate No. 1230683, cl. B 02 C 19/00, 1986.

Mizonov V.E. The formation of the dispersed composition and mass flow of bulk materials in technological grinding systems. Author. dis. M .: MIHM, 1984, p. 9. (54) METHOD OF CRUSHING ORE

(57) The invention relates to the crushing of minerals and can be used in the process of enrichment of ores and non-metallic minerals. In order to increase the yield of the useful product, the method of crushing the ores includes feeding the material into a impact crusher, screening and returning the particulate product to the crusher with repeated repetition of the cycle, and after two or three cycles, the speed of the shotgun rotor increases by 1.5-2 times. After the end of the circulation time, the rotor speed is reduced to its original value. The high density of useful minerals (cassiterite and wolframite), 2.6–2.8 times the density of other hay minerals, along with the different strength of these minerals, causes a high selectivity of crushing of tin and tungsten ores. By increasing the initial rotor speed to 60-80 k / s, good opening of useful minerals is achieved, and their content in the circulating product is reduced to the level of tailings. 1 ill., 1 tab.

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The invention relates to the crushing of minerals and can be used in the process of enrichment of ores and non-metallic minerals.

The purpose of the invention is to increase the yield of the useful product.

The drawing shows a diagram of the implementation of the crushing method.

The method is carried out as follows.

The material for crushing is supplied through the hopper 1 and the feeder 2 to the impact crusher 3. The crushed product is fed to the screen 4 with output of the undersize product for further processing and return of the superlattice product to crusher 3 by means of the transport device 5, or output of the shear product to the dump, due to transfer gate 6 to another position; The process of circulation of the material is repeated until the content of the useful mineral in it decreases to the level of the tailings (waste). After that, the gate 5 is transferred to the right position and the oversized product of the screen is dumped. After a certain time, for example, 1-2 minutes after the complete discharge of the circulation circuit, the gate 5 is moved to the left position, the feeder 2 is turned on and the process is repeated.

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F 00 HCHE

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3 149682 In this case, the source material is fed to the crusher in a crusher. operating at rotor speed, for example 30-40 m / s, allowing kltsy. crush. . less strong and heavier minerals, as well as intergrowths with large patches of useful minerals without excessive formation of fine fractions (sludge). The high density of useful minerals (cassiterite and wolframite) is 2.6–2.8 times higher than the density of other waste-bearing minerals, along with the different strength of these minerals, causes a high selectivity of crushing of tin and tungsten ores. The product circulates until the content of mineral minerals and in it becomes equal to the content of the useful mineral in the 20 tailings of the processing plant. Optimum regimens are achieved in the period of 4-6 hrrculations. Since the crushing material — along with large 25 grains and rich intergrowths of the useful mineral — contains a large number of small inclusions, crushing at a constant rotor speed does not reduce the content of 30 useful mineral in the circulating product to the waste. This causes a decrease in enrichment rates due to large losses of useful danepal with a circulating load. To avoid this, after two or three circulations of the material (when the main iiacTb is a large disseminated beneficial

the mineral is transferred to the undersize product of the rumble and there is no fear of over-grinding the useful mineral) they increase the speed of rotation of the rotor in order to open up small patches of the useful mineral. At the same time, the crusher rotor speed is increased (smoothly or stepwise) and crushing is carried out at a higher speed. Increasing the initial rotor speed by 1.5-2 times, i.e. up to 60-80 m / s, it allows to achieve a good opening of healthy minerals and a decrease in their content in the circulating product to the level of tailings. After the elapsed time, the rotor speed is reduced to its original value.

The test results are shown in the table.

Thus, the proposed method allows not only to increase the yield of the useful product, but also to reduce the amount of equipment used and to reduce the production area.

Claims (1)

Invention Formula The method of crushing ores by feeding the material into a impact crusher, screening and returning the oversize product to the crusher with multiple repetition of the cycle, characterized in that, in order to increase the yield of the useful product, after two or three cycles, the frequency of rotation of the crusher rotor is 1.5-2. times. Loading 1 min. Work 6 min, including: 3 min at a speed of 30 m / s, 3 min at a speed of 45 m / s. Unloading 1 min. Loading 1 min. Work 6 min., T, h: 3 min at a speed of 30 m / s, 3 min at a speed of 60 m / s. Unloading 1 min. Loading | 1 min Work 6 min, including: 3 min at a speed of 40 m / s, 3 min at a speed of 80 m / s , 06 125 , 05 150. 94 , 045, 185, The proportion of weak minerals in the waste is no more than 3-5%. No grains of useful mineral are found92 There are practically no weak minerals in the waste. There are no grains of useful mineral. Impregnation of useful minerals in hard rocks exceeds 0.1-0.3 mm Waste is represented by exceptionally strong minerals, but their output 90 is very small