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GB/T 15057.1-1994 PDF in English


GB/T 15057.1-1994 (GB/T15057.1-1994, GBT 15057.1-1994, GBT15057.1-1994)
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GB/T 15057.1-1994: PDF in English (GBT 15057.1-1994)

GB/T 15057.1-1994
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
UDC 549.51.661.543.06
D 51
GB/T 15057.1~15057.11-94
Chemical Analysis of Limestone for Chemical Industry
[Part 1.Limestone for Chemical Industry – Methods of Sampling and Preparing]
ISSUED ON. MAY 5, 1994
IMPLEMENTED ON. FEBRUARY 1, 1995
Issued by. State Bureau of Quality and Technical Supervision
Table of Contents
1 Theme Content and Scope... 3
2 Normative References... 3
3 Sampling Method... 3
4 Preparation of Sample... 5
Additional Information... 6
Limestone for Chemical Industry – Methods of Sampling
and Preparing
1 Subject Content and Scope
This Standard specifies the sampling and sample preparation methods for limestone used in
chemical industry.
This Standard applies to the collection and preparation of limestone analysis specimens for
chemical industry.
2 Normative References
GB/T 4650 Chemical products for industrial use – Sampling - Vocabulary
GB/T 6678 General Principles for Sampling Chemical Products
3 Sampling Method
3.1 Sampling of mine pile
The sampling point shall be no less than 0.3m from the top and from the bottom, and no less
than 0.2m from the surface. The sample quantity at each point collected in the same batch shall
be similar.
3.1.1 Ore of less than 1000t
The sampling amount shall be no less than 2/100,000.The row spacing and point spacing shall
be no greater than 2.5m, which shall be evenly distributed on the surface of the ore pile. Sample
shall be taken at the intersection of row spacing and point spacing.
3.1.2 Ore of greater than 1000t
The sampling amount shall be no less than 1/100,000.The row spacing and point spacing shall
be no greater than 3.5m; and shall be evenly distributed on the surface of the ore pile. Sample
shall be taken at the intersection of the row spacing and the point spacing.
3.2 Car and train sampling
The sampling amount shall be no less than 2/100,000.The row spacing and point spacing shall
be no greater than 1.5m, and shall be evenly distributed on the surface of the ore in the cabin.
Sample shall be taken at the intersection of the row spacing and the point spacing.
3.3.2 Ship of greater than 1000t
The sampling amount shall be no less than 1/100,000.The row spacing and point spacing shall
be no greater than 2.0m, and shall be evenly distributed on the surface of the ore in the cabin.
Sample shall be taken at the intersection of the row spacing and the point spacing.
3.4 Belt conveyor sampling
Sample quantity taken from the same batch shall be similar.
3.4.1 Sampling is conducted once every hour; and the sampling amount is 2/100,000 of the
throughput of the belt conveyor per hour.
3.4.2 The sampling position can be carried out at any section of the belt conveyor. Each time,
3-point samples are continuously and randomly taken from the cross-section of the belt
conveyor.
3.4.3 For ores with a transportation volume of less than 4 h, the number of sampling times from
the cross-section of the belt conveyor shall be no less than 6 times; and for ores with a
transportation volume of less than 2 h, the number of sampling times shall be no less than 4
times.
4 Preparation of Sample
4.1 Mixing each sample in a batch constitutes the sample of that batch.
4.2 The mixed sample needs to undergo procedures such as smashing, crushing, and grinding.
Each procedure shall be screened. Mix well and divide into quarters. Each reduction shall be
carried out as follows.
Where.
Q - the minimum reliable mass of the reduced sample, in kg,
d - maximum diameter of sample particles, in mm,
K - uniformity coefficient of ore, limestone is 0.1.
4.3 After all the samples, prepared according to 4.2, pass through the 1mm sieve hole, reduce
......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.