A compact (75 cm ht x 7 cm dia.) semi-batch type flotation column was developed for use as a convenient testing and research apparatus especially in laboratories that do not have sufficient headroom for a full-size experimental column installation. The design of the semi-batch column incorporated the Pachuca concept of pulp lifting and circulation to provide the necessary retention time for mineral recovery. The apparatus employed a porous gas sparger for bubble generation, featured a wash water sprayer, and had the ability to create a deep froth layer of variable thickness. The usability and performance of the column were examined and assessed through tests conducted on a magnetite ore. It is believed that with this device materials could effectively be tested for their amenability and response to column flotation. (C) 2011 Elsevier Ltd. All rights reserved.