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GB/T 1870-1995 English PDF (GBT1870-1995)

GB/T 1870-1995 English PDF (GBT1870-1995)

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GB/T 1870-1995: Phosphate rock and concentrate. Determination of moisture content. Cravimetric method
This standard specifies the gravimetric method for the determination of moisture. This standard applies to the determination of moisture in phosphate rock and phosphate concentrate products. 2 Method summary The specimen is dried at 105 ~ 110 ??C. The moisture is calculated according to the lost mass. 3 Instruments 3.1 Sample holder 1: Enamel plate. 3.2 Sample holder 2: Weighing bottle, flat, with ground mouth, 50 mm in diameter, about 30 mm in height. 3.3 Oven: It is equipped with an automatic temperature controller. 4 Specimen The specimen passes through a 10 mm and 425 ?m test sieve (GB 6003). 5 Analytical procedures 5.1 Phosphate rock Weigh about 1000 g of a specimen, which is less than 10 mm, accurate to 1 g. Evenly spread it on an enamel dish (3.1) of known mass; the thickness shall be less than 20 mm. Place in an oven, to dry it at 105 ~ 110 ??C for 3 h. Stir it gently once after a certain period of time. Take out the enamel dish. Cool to room temperature. Weigh it. Repeat the drying. The difference between the two weighings is not more than 2 g. 5.2 Phosphorus concentrate GB/T 1870-1995 www.ChineseStandard.net ? Buy True-PDF ? Auto-delivery. Page 5 of 5 Weigh about 10 g of a specimen, which is le

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