Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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Transactions of Nonferrous Metals Society of China

Vol. 22    No. 4    April 2012

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Electro-flotation and collision-attachment mechanism of fine cassiterite
QIN Wen-qing, REN Liu-yi, WANG Pei-pei, YANG Cong-ren, ZHANG Yan-sheng

School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China

Abstract:In order to discuss the particle-bubble interaction during the electro-flotation of cassiterite, the recovery of cassiterite with different particle sizes was investigated, and the collision mechanism between the cassiterite particles and H2 bubbles was explored. The flotation tests were carried out in a single bubble flotation cell. The results show that cassiterite particles <10 μm, 10−20 μm, 20−38 μm and 38−74 μm match with bubbles with size of 50−150 μm, about 250 μm, 74 μm and 74 μm, respectively, and a better recovery can be obtained. It is demonstrated that the recovery of cassiterite is influenced by the size of cassiterite particles and bubbles. Furthermore, the probabilities of collision, adhesion, detachment and collection were calculated using the collision, attachment and collection models. Theoretical calculation results show that the collision probability decreases sharply with decreasing particle size and increasing bubble size (below 150 μm). The attachment probability would increase from the effective collision, leading to the increase of recovery.


Key words: cassiterite; particle−bubble interaction; fine particle flotation; electro-flotation; collision−attachment probability

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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