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GB/T 2007.7-1987 PDF English

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GB/T 2007.7-1987: General rules for the sampling and sample preparation of minerals in bulk. The method for determination of size by manual sieving
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GB/T 2007.7-1987English90 Add to Cart 0-9 seconds. Auto-delivery General rules for the sampling and sample preparation of minerals in bulk. The method for determination of size by manual sieving

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GB/T 2007.7-1987: General rules for the sampling and sample preparation of minerals in bulk. The method for determination of size by manual sieving


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GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA UDC 622-3.543.05 GB/T 2007.7-87 Replacing GB 2007-1980 General Rules for the Sampling and Sample Preparation of Minerals in Bulk - The Method for Determination of Size by Manual Sieving APPROVED ON. DECEMBER 15, 1987 Implemented on. OCTOBER 01, 1988 Approved by. National Bureau of Standards

Table of Contents

1 Applicable Scope... 3 2 Normative References... 3 3 Terms and Definitions... 3 4 Instrument... 4 5 Sieving Methods... 4 6 Calculation of Results... 5 7 Others... 6 Additional Information... 7 General Rules for the Sampling and Sample Preparation of Minerals in Bulk - The Method for Determination of Size by Manual Sieving

1 Applicable Scope

This Standard is applicable to the determination of the grain-sizes of various minerals specified in GB 2007.1.

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 GB 2007.5 General Rules for the Sampling and Sample Preparation of Minerals in Bulk-Experimental Method for Checking the Bias of Sampling GB 6003 Test Sieve GB 6004 Square Mesh Woven by Metal Wire for Test Sieve

3 Terms and Definitions

3.1 Grain-size. it is expressed by the minimum mesh size that the substances pass through the sieve in the sieving test. 3.2 Grain-size distribution. the sample is divided into the particle groups according to the gran-size, which is expressed by the mass percentage. 3.6 Quantity of sample for sieving. the mass of minerals that is actually used in the sieving test. All samples that are taken from a batch of minerals according to GB 2007.1.

4 Instrument

4.1 Sieve 4.1.1 Shape of mesh. square mesh. 4.1.4 Preparation and verification of sieves. The sieves shall be carefully inspected and cleaned before use. Both new sieves and sieves that have been used for a certain period of time need to check the size of the meshes to ensure that the size of the mesh is within the specified tolerance. For the check method, see GB 6003. 4.2 Weighing apparatus The maximum weighing of the weighing apparatus is required to be close to the quantity of sample used for sieving. If the conditions are not satisfied, it is allowed to weigh for several times. 4.3 Drying oven It has the function of automatically controlling temperature.

5 Sieving Methods

5.1 Sample-loading quantity. according to the size of the mesh, the area of the screen and the maximum grain-size of the sample, and maximum sample-loading quantity can refer to Table 1. 5.2 Put the sample for sieving with less than the maximum sample-loading quantity listed in Table 1 in the sieve of the specified aperture. Use multiple sieves of different apertures for simultaneous screening; arrange in sequence from top to bottom according to the sizes of the meshes. 5.6 After sieving, each grain-sized sample is measured separately. 5.7 When sieving particles larger than 50mm, the residual minerals on the sieve may be tested by hand. Large-particle minerals may be measured with a square gauge of corresponding size.

6 Calculation of Results

6.1 When determining the particle size of a large sample, calculate it according to Formula (1), and the result shall retain one digit after the decimal point. 6.2 Determine the grain-size of duplicate sample; calculate according to Formula (2). Each grain-size interval shall be calculated to the two digits after the decimal point.

7 Others

7.1 If the sample is too wet, it may be dried to a level suitable for sieving at a temperature lower than that causes the changes in sample quality and grain-size. When sieving, if the sample humidity and air humidity are in a balanced state, more satisfactory results can be obtained. 7.3 In order to protect the screen, the maximum grain-size of the sample shall be limited for sieves with different apertures, as shown in Table 2. ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.


      

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