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GB/T 25946-2010: Aluminium ores -- Experimental methods for checking the bias of sampling
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GB/T 25946-2010: Aluminium ores -- Experimental methods for checking the bias of sampling

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Aluminium ores. Experimental methods for checking the bias of sampling ICS 73.060.40 H30 National Standards of People's Republic of China Bauxite Sampling bias test methods Aluminiumores- (ISO 10226.1991, IDT) Issued on. 2010-12-23 2011-09-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

This standard uses the translation method identical with ISO 10226.1991 "Test Method bauxite sampling bias." This standard by the national non-ferrous metals Standardization Technical Committee (SAC/TC243) centralized. This standard is drafted by. Aluminum Corporation of China Zhengzhou Research Institute, China Nonferrous Metals Industry Quality Standards and Metrology The amount of the Institute. The main drafters of this standard. Benji, Liyue Ping, Zhang Jie, Zhang Wei-hua, Li Jin. Bauxite Sampling bias test methods

1 Scope

This standard specifies according to GB/T 25945-2010/ISO 8685. sampling, sample bias 1992 for bauxite procedural requirements check Test methods. This standard applies to bauxite sampling bias test. NOTE. The method is also suitable in accordance with 25949-2010/ISO 6140 GB/T .1991 requirements for sample preparation, the standard deviation of the sample preparation test.

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein Member. For undated references, the latest edition (including any amendments) applies to this document. GB/T 25945-2010 bauxite sampling procedures (ISO 8685.1992, IDT) GB/T 25949-2010 bauxite sample preparation (ISO 6140.1991, IDT)

3 General

3.1 Test method given in this standard, the test methods to be (called Method B) the obtained results with the standard method (referred to as method A), The results were compared, from a technical point of view and experience that the test results Method A is not bias. By statistically speaking, there is no significant difference in the results of Method A and Method B obtained in the case, the method can be used as a conventional B method. NOTE. In this standard, with a t-distribution (singlet) assess the deviation at 5% significance level, the difference between the test results to determine the method B and method A random Occasional differences or statistical differences. The number of samples tested in pairs at least 20 groups. The requested data set depends on the number of data set 20 and the standard deviation of the difference according to Article 6 Determination of the deviation δ. Quality characteristics can be any physical or chemical quantity, is the most commonly used alumina, silica, and Moisture. One can not always be measured deviation parameters to be measured and the deviation of the plurality of parameters, especially those receiving more attention after some Parameters should ensure that no deviation. To test the quality characteristics to be determined before the start of the test. When parts of methods A and B samples taken from the neighborhood When heap near bauxite, preparing and testing samples should be carried out separately on each of the parts like reduction points. This standard does not apply to parts of the mixed sample data, sub-sample or population samples were compared. Article 6 test data analysis procedure described also applies to different locations (such as loading and unloading to ground) collected samples of the same batch of material Product results clearly possible deviations. 3.2 After conducting series of tests should be regular intervals and when there are changes in the quality of bauxite, repeat test; or when the device When bauxite supply changes, but also the need for repeat testing. ...