Crushers and Their Types...

Crushers and Their Types A crusher is a multi dimensional machine which is designed to reduce large size materials into smaller size materials. Crushers may be used to reduce the size, or change the form of waste materials so they can be more easily disposed of or recycled, or to reduce the size of a solid mix of raw materials (as in the case of ore), so that pieces of different composition can be differentiated for separation. Crushers are normally low speed machines that are designed for breaking large lumps of ores and stones, even aving a size with a diameter of over one and half meter. The purpose of crusher is to reduce the size of the materials for making them usable in construction or industrial use, or for extraction of valuable minerals trapped within a ore matrix. Crushing is the process of transferring a force amplified by mechanical advantage through a material made of molecules that bond together more strongly, and resist deformation more, than those in the material being crushed do. Crushing devices hold material between two parallel or tangent solid surfaces, and apply sufficient force to bring the surfaces together to generate enough energy within the material being crushed so that its molecules separate from (fracturing), or change alignment in relation to (deformation), each other. There are four basic ways to reduce a material, namely (i) impact, (ii) attrition, (iii) shear, and (iv) compression. Most crushers employ a combination of all these crushing methods. Impact – In crushing terminology, impact refers to the sharp, instantaneous collision of one moving object against another. Both objects may be moving, or one object may be motionless. There are two variations of impact, namely (i) gravity impact, and (ii) dynamic impact. Material dropped onto a hard...

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...