JIS-M-8124-1979-R1984-ENG.pdf
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1、- - 4 JIS M*8124 79 I 4933b08 00bb379 9 JIS UDC 622.34 :543.062 : 546.47 , JAPANESE INDUSTRIAL STANDARD- Methods for Determination of Zinc in Ores JIS M 8 1 2 4 - 1 9 7 9 Translated and Published by Japanese Standards Association L Printed in Japan 9s Copyright Japanese Standards Association Provide
2、d by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/14/2007 20:28:35 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S M*8L24 79 E 4933608 00bb3BO 5 In the event of any doubt arising, the original Standard in Japanese i
3、s to be final authority. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/14/2007 20:28:35 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S M*8124 79 4933608 00bb38L 7
4、 E UDC 622.34:543.062:546.47 JAPANESE INDUSTRIAL STANDARD J I S MetQods for Determination of M 8124-1979 Zinc in Ores (Reaffirmed: 1984) 1. Scope This Japanese Industrial Standard specifies the methods for determination of zinc in ores. methods for determination of zinc are specified in other JIS. H
5、owever, this standard does not apply to the ores to which the 2. General Matters General matters common to the determination methods shall be as described in JIS K 0050 and JIS K 0121. 3. Sampling and Treating of Analysis Sample Sampling and Preparation of Sample 3.1 The sampling and preparation of
6、sample shall be as described in JIS M 8101 and JIS M 8083. 3.2 Weighing of Sample The weighing of a sample shall be as follows: (1) In weighing out a sample, thoroughly mix the sample bystirring carefully to represent average composition and further confirm no mixture with foreign matters, Put the s
7、ample into the air bath regulated at 105 k 5“C, dry it, take it out from the air bath at each 2 h and let it stand to cool in a desiccator to ordinary temperature. drying becomes not more than 0.1 % per 2 h. However, the drying conditions (temperature, time, etc.) of the sample liable to be deterior
8、ated because of containing sulfides or the like shall be as agreed between the parties concerned, (2) Repeat its drying until the loss on (3) For weighing out the sample, weigh out, as a rule, a specified amount to the nearest 1 mg by using a chemical balance. Applicable Standards: JIS K 0050-Genera
9、l Rules for Chemical Analysis JIS K 0121-General Rules for Atomic Absorption Spectrochemical Analysis JIS K 8005-Standard Substances for Volumetric Analysis JIS M 8083-Methods for Sampling of Non-Ferrous Flotation Concentrates in Bulk JIS M 8101-Methods for Sampling of Metal Bearing Ores of Copper,
10、JIS 2 8401-Rules for Rounding off of Nmerical Values Lead, Zinc, Tin, Gold, Silver and Others Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/14/2007 20:28:35 MDTNo reproduction or networking permi
11、tted without license from IHS -,-,- J I S Mu8124 79 E 4933608 00663B2 9 S 2 M 8124-1979 4. Expression of Analysis Value and Cautions on Operation 4.1 Expression of Analysis Value The expression of analysis value shall be as follows: (1) Express an analysis value in percentage and round off it to thr
12、ee places of decimals in accordance with JIS Z 8401. (2) Repeat the analysis two times in the same laboratory. difference between them is under the tolerance within the same laboratory, obtain their average and round off it to two places of decimals in accordance with JIS Z 8401 to be the report val
13、ue. When the (3) When the difference between analysis values obtained by repetition of two times exceeds the tolerance, carry out the analysis two times again. (4) The tolerance shall be as given in Table 1. Table 1. Tolerances ( l ) Unit: % Determination method Classification Within the same labora
14、tory (repetition) Ion-exchange separation 30 and over EDTA titrimetric method 10 to 30 excl. Precipitate separation 3 to 10 excl. 0.5 to 3 excl. EDTA titrimetric method 0.350 0.250 0.150 0.075 I i to 3 excl. I 0.3 to 1 excl. 0.1 to 0.3 excl. Atomic absorption method I 0.01 to 0.1 exci. I 0.150 0.040
15、 0.025 0.010 Note (I) When two analysis values extend over two classes, the tolerance of a class corresponding to average value of two analysis values shall be applied. 4.2 Cautions on Analytical Operation Cautions on analytical operation shall be as follows: (1) In analysis, a blank test shall be c
16、arried out through all the operation and the analysis value shall be corrected. (2) The flame of air and acetylene shall be used for the flame in atomic absorption method. However, if the conformance to the accuracy and precision has been confirmed, the flame of air and hydrogen and other flames may
17、 be used. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/14/2007 20:28:35 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S M*8L24 79 O 4933608 00bb383 O O 3 M 8124-1
18、979 5. Determination Method 5.1 Classification of Methods The method for determination of zinc in ores shall be as described in either one of the following methods: ( 1) Ion-Exchange Separation EDTA Titrimetric Method This method shall (2) Precipitate Separation EDTA Titrimetric Method This method s
19、hall be applied to the sample of 0.5 % min. in zinc content. be applied to the sample of 0.5 % min. in zinc content (2). (3) Atomic Absorption Method This method shall be applied to the sample of 0.01 % and over to 3 % excl. in zinc content. Note ( 2 ) This method is applied to the sample which does
20、 not contain nickel and cobalt. 5.2 Ion-Exchange SeDaration EDTA Titrimetric Method 5.2.1 Purport After decomposing a sample with hydrochloric acid and nitric acid, and add sulfuric acid to generate white fume of sulfuric acid by heating. Dissolve soluble salts with water. After filtration, add hydr
21、ochloric acid and adsorb zinc by passing hydrochloric acid through an anion-exchange column. Then, remove copper, iron, etc. by passing dilute hydrochloric acid. Thereafter, elute zinc by passing ammonia-ammonium chloride. Add acetic acid and ammonium acetate thereto and regulate pH of the solution
22、at approx. 5.5. Thereafter, add ammonium fluoride and sodium thiosulfate, mask copper or the like, utilize Xylenol Orange as the indicator and titrate the sample solution with EDTA standard Reagents Hydrochloric acid Hydrochloric acid (1 t 5) Nitric acid Nitric acid (1 t 1) Hydrofluoric acid Hydrobr
23、omic acid The reagents shall be as follows: Sulfuric acid (1 t 1, 1 t 100) Aqueous ammonia Bromine Hydrochloric acid- ascorbic acid solution to 100 ml hydrochloric acid (1 + 5) to dissolve it. solution at each service. Ammonia-ammonium chloride solution to 1000 ml aqueous ammonia (7 t 100) to be dis
24、solved. Add 0.25 g ascorbic acid Prepare this Add 20 g ammonium chloride Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/14/2007 20:28:35 MDTNo reproduction or networking permitted without license
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- JIS 8124 1979 R1984 ENG
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