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GB/T 1870-1995Phosphate rock and concentrate - Determination of moisture content-Cravimetric method (English PDF)

磷矿石和精磷矿中水分的测定重量法

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

January 2, 1995

Implementation date

August 1, 1996

Scope

GB/T 1870-1995 is the English-translated version of 磷矿石和精磷矿中水分的测定重量法.

GB/T 1870-1995 — 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.

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Document preview — GB/T 1870-1995

Foreword1
Scope2
Method summary3
Instruments4
Specimen5
Phosphate rock6

Foreword

This standard revises GB/T 1870-80 "Phosphate rock and concentrate - Determination of moisture content - Gravimetric method".

The determination of moisture in phosphorus concentrate, which is specified in this standard, equivalently adopts the method in the former Soviet standard TOCT 22275-90 "Apatite concentrate".

The determination of moisture in phosphate rock, which is stipulated in this standard, non-equivalently adopts the method in the American Association of Florida Phosphate Chemists (AFPC) "Phosphate rock analysis method (1980 sixth edition).

During the revision process of this standard, through a large number of investigations and studies, data analysis, test verification, it is considered that in the previous version, the external moisture and internal moisture are measured separately, then add them together to obtain the total moisture, the steps are cumbersome. This revision is to measure the total moisture at 105 ~ 110 °C, which is drying at one time. In addition, the determination methods of moisture in phosphate rocks and phosphate concentrates, which have different particle sizes, are stipulated respectively. The method is simple, time-saving and practical. It is drafted in accordance with the rules given in GB/T 1.1-1993.

This standard replaces GB/T 1870-80 from the date of implementation.

This standard was proposed by the Ministry of Chemical Industry of the People's Republic of China.

This standard shall be under the jurisdiction of the Chemical Mine Design and Research Institute of the Ministry of Chemical Industry.

Drafting organizations of this standard: Chemical Mine Design and Research Institute of the Ministry of Chemical Industry.

1 Scope

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 µm test sieve (GB 6003).

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.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 5 pages — is available in the English PDF.

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