BS ISO 12742:2020 pdf free.Copper, lead and zinc sulfide concentrates – Determination of transportable moisture limits – Flow-table method.
BS ISO 127421 Scope This document specifies a flow-table method for the determination of the transportable moisture limit
(TML) of copper, lead and zinc sulfide concentrates, which can liquefy during transport. It is applicable to the determination of the TML of concentrates containing 10 % to 80 % (mass fraction) of lead, 10 % to 65 % (mass fraction) of zine or 10 % to 55 % (mass fraction) of copper and is applicable to TML values in the range 3 % to 28 % (mass fraction). 2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IS0 10251, Copper, lead, zinc and nickel concentrates一Determination of mass loss ofbulk material on drying
IS0 12743, Copper, lead, zinc and nickel concentrates一Sampling procedures for determination of metal and moisture content
3 Terms and definitions For the purposes of this document, the fllwing terms and definitions apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: 一ISO Online browsing platform: available at https://www.iso.org/obp 一IEC Electropedia: available at http://www.electropedia.org/
3.1 flow moisture point percentage of moisture at which a flow state is reached . 3.2 transportable moisture limit maximum percentage of moisture that a cargo can contain during transport without the risk of liquefaction 4 Principle The moisture content of the sample is adjusted by mixing with water. The mixture is converted to a conical shape using a mould and tamper. The sample is placed on the flow table and the mould is removed. The flow characteristics are determined by repeated dropping of the flow table while observing the behaviour of the sample. When sufficient water has been added to the sample so that plastic deformation occurs during the dropping of the flow table, the sample is considered to be at its flow moisture point. The TML is calculated as 90 % of the flow moisture point. BS ISO 12742 pdf download.