Selective comminution of two-component mineral mixtures

Abstract

One of the promising ways of improving the efficiency of enrichment processes for economic minerals including those with different strengths is use of selective conmlinution in the preliminary stage of enrichment and in obtaining intermediate or final enrichment products.Recently in our country and abroad research has been carried out into the kinetics of comminution for two-component mineral mixtures including those with different strength characteristics [I-6].This work has developed in two main directions:-a study of the kinetics of combined comminution of minerals of different strengths with the aim of obtaining a prescribed range of size fractions for the charge going on to subsequent processing [1-2].-selective comminution of ores in order to obtain one of the final enrichment products [4,5].Results are presented in our work for a study of selective comminution of two-components mixtures in ball mills.The main factors which determine the process of selective comminution for the weak component of an ore are strength properties of the components, the ratio of component sizes, and the ratio of the energy of the grinding bodies to the energy required for breaking the particles of both components.We consider the various energy combinations with selective comminution of two-component mineral mixtures.We introduce the following notation (in J):E is the energy of grinding bodies at the instant of impact;Emax is the energy required in order to break particles of the strong component of the --S. C -maximum size;Emin is the energy required in order to break particles of the strong component of the s.c minimum size; E~? x is the energy required in order to break Particles of the weak component of the maximum size;Emin is the energy required in order to break particles of the weak component of the W.C minimum size.

Stirred milling kinetics of siliceous goethitic nickel laterite for selective comminution

“…Therefore, either a soft, fine product or a hard, coarse valuable mineral fraction was achieved (Stepanov et al, 1991). Selective comminution was investigated on different minerals systems, such as low-grade bauxite and quartz-feldspar ores.…”

Impact Crushing Characteristics and Relationship between Multicomponent Complex Ore and Its Component Minerals

“…Furthermore, by determining the crystal structure in the ore and combining the hardness, toughness, and strength indexes of the minerals in the ore, the parameters required for the operation of the system could be calculated to quantitatively analyze the selective-crushing behavior of the ore from the microstructure perspective. Stepanov et al [12] considered a mixture of quartz and rock salt and determined that the primary factors that affect the selective crushing of soft-component minerals in the two-component mixed minerals were the hardness of the mineral itself, the feed sizes, and the ratio of the crushing energy in the mill to the energy required for crushing the two-component minerals. This was performed by observing the characteristics of the two-component mixed minerals' crushing behavior in the mill.…”

Selective comminution and grinding mechanisms of spent carbon anode from aluminum electrolysis using ball and rod mills

“…Moreover, appropriate selective comminution preconcentrates the ore and removes the coarse liberated gangue before entering the subsequent milling circuit, which is a potential strategy for substantial energy saving (Hesse et al, 2017;Lowes et al, 2018). Selective comminution is the result of a comminution system that comprises appropriate comminution parameters (such as operational parameters and the design of the comminution machine) and inherently suitable material properties (Hesse, 2014;Stepanov et al, 1991). The different distributions of valuable and waste minerals (as a function of particle size) are commonly employed to characterize selective comminution qualitatively (Hesse et al, 2017).…”