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GB/T 2007.6-1987: General rules for the sampling and sample preparation of minerals in bulk - Determination of moisture content - Heat drying method Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure GB/T 2007.6: Historical versions
Similar standardsGB/T 2007.6-1987: General rules for the sampling and sample preparation of minerals in bulk - Determination of moisture content - Heat drying method---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT2007.6-1987 GB UDC 622-3.543.05 NATIONAL STANDARD Replacing GB 2007-1980 General Rules for the Sampling and Sample Preparation of Minerals in Bulk Determination of Moisture Content – Heat Drying Method Issued on. DECEMBER 15, 1987 Implemented on. OCTOBER 01, 1988 Issued by. National Standard Bureau Table of Contents1 Scope of application... 3 2 Normative references... 3 3 Instruments... 3 4 Sample... 3 5 Determination... 4 6 Calculation and result expression... 5 Annex A Determination of Moisture Content of Sticky and Wet Ore (Supplement)... 7 Annex B Sprayed Water and Rain Water Correction (Supplement)... 8 Additional information... 13 General Rules for the Sampling and Sample Preparation of Minerals in Bulk Determination of Moisture Content - Heat Drying Method UDC 622-3.543.05 GB 2007.6-87 Replacing GB 2007-80 1 Scope of application This standard applies to the determination of moisture content of ore described in GB 2007.1.However, it does not apply to some easily oxidized sulfide ore. 2 Normative references GB 2007.1 General rules for the sampling and sample preparation of minerals in bulk-Sampling by manual method GB 2007.2 General rules for the sampling and sample preparation of minerals in bulk-Manual method of sample preparation 3 Instruments 3.1 Drying plate. Stainless metal plate of which the surface is smooth and clean. It can accommodate a specified number of samples of which the thickness of sample layer does not exceed 31.5mm. 4 Sample Take samples and prepare samples in accordance with relevant standards. For samples that are too wet or sticky and thus hard to sift or crush or divide, samples can be pre-dried until sample preparation is not difficult (see Annex A). 5 Determination 5.1 Determination times Conduct one-time moisture determination for each aqueous sample according to sample preparation mode according to the test number specified in Table 2. 5.2 Determination procedures Place aqueous sample into a drying plate with a known mass (m1) and pave according to the mass specified in Table 1; control its thickness within 30mm; weigh (m2) and place into the drying oven that has been preset to a specified temperature. Keep this temperature for at least 2h; take out the drying plate that contains sample; immediately weigh it while it is hot, or place into a dryer to cool to room temperature and weigh. 6 Calculation and result expression 6.1 Calculation of sample moisture Moisture content W1 (%) of each aqueous content is calculated according to Formula (1). It is reported to the second decimal. 6.2 Calculation of moisture content of one lot of ore 6.2.1 When moisture content of aqueous sample from bulk sample is determined, mean value W of moisture contents of whole lot of ore is calculated according to Formula (2); it is reported to the first decimal; 6.2.3 When a lot of ore is divided into several parts with unequal mass, moisture content of each part must be determined separately; moisture content of each part is accurate to the second decimal in calculation; moisture content of the whole lot is reported to the first decimal.Annex ADetermination of Moisture Content of Sticky and Wet Ore (Supplement) When it is difficult to crush and divide the sample because the sample is too wet or sticky, sample shall be pre-dried. In this case, determine the moisture content of whole lot of ore according to the method specified in A1 to A3; and then calculate total moisture content according to clause A4 to clause A7. A1 Mass of sample weighed is accurate to 0.05% of sample mass. A2 Pave the sample and place it into drying apparatus that is set to a specified temperature or in air; dry to approximate equilibrium between ore moisture and air humidity; do not lose fine powder during the drying process.Annex BSprayed Water and Rain Water Correction (Supplement) In order to prevent environmental pollution, it should spray water to ore during the handling process, so as to suppress the dust flying. In this case, it is necessary to correct the mass of sprayed water in moisture content of whole lot of ore according to the method specified in this Annex. This Annex also describes moisture content correction method of a lot of ore that contains rainwater. B1 Sprayed water correction B1.1 Sprayed water It refers to the water sprayed to cabin or the water sprayed to sampling points during ship loading as well as the water sprayed to cabin at the time of shipment and (or) the water sprayed to ore after aqueous sample is taken. B1.2 Determination of sprayed water Sprayed water may be determined through flow meter of which the degree of accuracy is ±5 %; multiply the volume measured by the density of sprayed water; then convert into mass Mi, expressed in tons. B1.5 The calculation method of moisture content when aqueous sample is taken during ship loading process before water spraying. Moisture content Ws (%) of a lot of ore to correct spray is calculated according to Formula (B2). The result is accurate to the first decimal. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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