Classification of Materials and Types of Classifiers...

Classification of Materials and Types of Classifiers Size control of particles finer than 1 mm, are out of the practical range of conventional screens. Separation of such particles is carried out by classification. Classification implies the sorting of particulate material into different size ranges. It is a method of separation of fines from coarse particles and also lighter particles from heavier particles. The two product streams resulting from any classifiers are (i) a partially drained fraction containing the coarse particles, and (ii) a fine fraction of particles. Usually the principle of the classification is based upon the various densities, specific gravity, terminal falling velocities of particles in liquid and in air. Classification is defined as a method of separating mixtures of mineral particles into two or more products according to their settling velocities in water, in air or in other fluids. Classification is performed on the basis of the velocity with which the material particles fall through a fluid medium generally water or air. In view of the fact, that the velocity of particles in a fluid medium is dependent not only on the size, but also on the specific gravity and shape of the particles. In classifiers, use is made of the different rates of movement of particles of different sizes and densities suspended in a fluid and differentially affected by imposed forces such as gravity and centrifugal fields, by making suitable arrangements to collect the different fractions as they move to different regions. Based on their separation principles, classifiers are classified into two major types. They are (i) wet classifiers, and (ii) dry classifiers. Wet classification with hydro-cyclones using separation by centrifugal force typically covers the size range of 10 micrometers to 100 micrometers while wet classification with spiral classifiers using separation...

Terms and Standards used for Mineral Deposits Classification...

Terms and Standards used for Mineral Deposits Classification The terms and standards used for the classifications of mineral deposits are described below. Competence – It requires that the Public Report be based on work that is the responsibility of suitably qualified and experienced persons who are subject to an enforceable professional code of ethics (the Competent Person). Competent Person – A Competent Person is a mineral industry professional, defined as a corporate member, registrant or licensee of a recognized professional body (including mutually recognized international professional organizations) with enforceable disciplinary processes including the powers to suspend or expel a member. A competent person must have a minimum of five years relevant experience in the style of mineralization or type of deposit under consideration and in the activity which that person is undertaking. Recognized Professional Organizations (RPO) and classes of membership under the standard, which meet these requirements, are listed in the standards or on their websites. If the Competent Person is preparing documentation on Exploration Results, the relevant experience must be in exploration. If the Competent Person is estimating, or supervising the estimation of Mineral Resources, the relevant experience must be in estimation, assessment, and evaluation of Mineral Resources. If the Competent Person is estimating or supervising the estimation of Ore Reserves, the relevant experience must be in the estimation, assessment, evaluation and economic extraction of Ore Reserves. CRIRSCO – CRIRSCO provides an international forum that enables countries to ensure consistency of their reporting standards.  It is an international advisory body without legal authority and relies on its constituent members to ensure regulatory and disciplinary actions at a National level. It was formed in 1994 under the auspices of the Council of Mining and Metallurgical Institutes (CMMI). It was established as grouping of representatives...