SYNTHESIS OF FLOTATION BASED SEPARATION SYSTEMS
In this work a methodology is presented for defining the optimal configuration for flotation circuit and selection of appropriate equipment for the process. The problem is represented by three hierarchized superstructures. The first level represents separation tasks, which include: feed processing, concentrate processing, and tail processing. The second level represents the stream network needed to carry out each tasks. Where for each task a superstructure is developed which includes several operational stages. At the third level, several equipment alternatives are considered for each stage. The equipment discussed in the model includes flotation column and flotation cell banks, with and without grinding. The optimal selection of the circuit is made with an appropriate objective function, upon which the values of the operational and structural variables may be determined. The problem is formulated using disjunctive programming, which is converted to a MILP problem. The model includes mass balance, equipment models, operational conditions, and logic relationship. The paper presents an example to illustrate its application for effective design of a copper concentration plant.
Column flotation circuits in Chilean copper concentrators
Abstract This paper reviews the column flotation practice in the largest Chilean copper-moly concentrators where this process unit has been increasingly chosen to replace multi stage cleaning circuits in new and existing operations. Process flowsheets incorporating columns are presented for selected concentrators. Procedures for scaling up, and process control are also illustrated.
Natural oleophilicity/hydrophobicity of sulphide minerals, II. Pyrite
Oleophilicity/hydrophobicity of pyrite has been investigated by using two-liquid flotation and contact-angle measurements with and without the conditions of controlled electrochemical potential techniques. Unoxidised pyrite was oleophilic in a mineral/oil/water system but hydrophilic in a mineral/vapour/water system. The oleophilicity was Eh−pH dependent. In alkaline and neutral pH conditions it decreased with oxidation due to the formation of Fe(OH)2 and Fe(OH)3. However, in acidic solutions of pH < 4, the oleophilicity first increased with oxidation due to the formation of S0, then decreased as the Fe(OH)3 also formed on the surface.