A classification device capable of being integrated to flotation columns and its classification performance
In order to discharge fine slime from the flotation tailings and make preparations for the possible individual recovery of coarse coal losses in flotation tailings, a classification device that can be integrated to flotation column was developed. It has n
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Springer International Publishing Switzerland 2016 V. Litvinenko (ed.), XVIII International Coal Preparation Congress, DOI 10.1007/978-3-319-40943-6_158
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Y. Hong-li et al.
No matter which method is to be used to recover the coarse particles in flotation tailing, classification or desliming is the first step. Not all the flotation tailings is necessary to recover and the treating equipment is not always applicable for the initial concentration or original size distribution of the flotation tailings. Classification of the coarse and the fine or desliming is necessary. High frequency screen and hydrocyclone are the most commonly used pretreatment equipments for flotation tailing, but they occupy extra area, have the disadvantage of power consumption, and result in complex flowsheet. A classification device with inside overflow discharge and without moving parts or extra auxiliary facilities has been reported aiming at the classification of flotation tailings (Yang and Fan 2012). But the coarse losses into the fine products and the fine entrainment into the coarse products were both high. This article is to develop a new classification device with periphery overflow discharge, aiming to conduct reasonable classification and make preparation for possible individual recovery of coarse coal losses in flotation tailings. It is capable of integrated to the bottom of flotation equipment. The design and operation parameters are to be optimized to acquire satisfactory classification on coal flotation tailings. 2 Methods 2.1 Design of the classification device with periphery overflow A schematic of flotation column integrated with a classification device and the design of the experimental classification device are given in Fig.1. The basic design is to put a tank with conical bottom outside the lower part of flotation equipment (take flotation column as an example).
Fig.1 Grouped schematic of a flotation column and the classification device (a), and the design of experimental classification device (b) After conducted flotation in the upper part of flotation column, the tailing slurry that does not go into the froth flows downward under its gravity and reaches the classification section. In this section, some slurry containing coarse particles is discharged through the underflow apex at the bottom of the cone, while more slurry turns upward and is ultimately discharged from the periphery area between the outer tank and the column. The coarse particles have high settling velocity, quickly settle down and are discharged into the underflow. The fine particles, on the other hand, have low settling velocity and tend to be discharged with the overflow. Even if some fine particles go down near the cone bottom, they still have more chance to turn upward because of the condensing effect of the cone. To facilitate the set up of the experimental device, an individual classification device with an outer
A Classification Device Capable of Being Integrated …
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tank of 400mm was designed, and an inner tank (a column) was p
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