YS/T 820.3-2013 (YS/T 820.3-2012) PDF EnglishUS$120.00 · In stock · Download in 9 seconds
YS/T 820.3-2012: Methods for chemical analysis of laterite nickel ores - Part 3: Determination of total iron content - Potassium dichromate titration Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid YS/T 820.3: Historical versions
Similar standardsYS/T 820.3-2012: Methods for chemical analysis of laterite nickel ores - Part 3: Determination of total iron content - Potassium dichromate titration---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/YST820.3-2012 YS NONFERROUS METALLURGY INDUSTRY STANDARD ICS 73.060 D 04 Methods for chemical analysis of laterite nickel ores - Part 3.Determination of total iron content - Potassium dichromate titration Issued on: NOVEMBER 07, 2012 Implemented on: MARCH 01, 2013 Issued by. Ministry of Industry and Information Technology of the People's Republic of China. Table of ContentsForeword... 3 1 Scope... 6 2 Normative references... 6 3 Method summary... 6 4 Reagents... 6 5 Specimen... 8 6 Analysis steps... 8 7 Calculation of analysis results... 9 8 Precision... 10 9 Test report... 10ForewordThis Part was drafted in accordance with the rules given in GB/T 1.1-2009. YS/T 820-2012 “Methods for chemical analysis of laterite nickel ores” consists of 26 parts. - Part 1.Determination of nickel content - Flame atomic absorption spectrometry; - Part 2.Determination of nickel content - Dimethylglyoxime spectrophotometry; - Part 3.Determination of total iron content - Potassium dichromate titration; - Part 4.Determination of phosphorus content - Phosphorus molybdenum blue spectrophotometry; - Part 5.Determination of cobalt content - Flame atomic absorption spectrometry; - Part 6.Determination of copper content - Flame atomic absorption spectrometry; - Part 7.Determination of calcium and magnesium content – Flame atomic absorption spectrometry; - Part 8.Determination of silica content - Potassium silicafluoride titrimetric method; - Part 9.Determination of scandium and cadmium contents - Inductively coupled plasma mass spectrometry; - Part 10.Determination of calcium, cobalt, copper, magnesium, manganese, nickel, phosphate and zinc content - Inductively coupled plasma atomic emission spectrometry; - Part 11.Determination of fluorine and chlorine contents - Ion chromatography; - Part 12.Determination of manganese content - Flame atomic absorption spectrometry; - Part 13.Determination of lead content - Flame atomic absorption spectrometry; - Part 14.Determination of the zinc content - Flame atomic absorption spectrometry; Methods for chemical analysis of laterite nickel ores - Part 3.Determination of total iron content - Potassium dichromate titration1 ScopeThis Part of YS/T 820 specifies the determination method of total iron content in laterite nickel ores. This Part is applicable to the determination of total iron content in laterite nickel ores. The determination range is 7.00%~55.00%.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. YS/T 820.24-2012, Methods for chemical analysis of laterite nickel ores - Part 24.Determination hygroscopic moisture content - Gravimetric method3 Method summaryThe test material is melted with sodium peroxide. Use water to leach the cooled melt out. Then use hydrochloric acid to acidize. Most of the iron is reduced by stannous chloride. The remaining iron is reduced by titanium trichloride. Use potassium dichromate solution to oxidize the excess reducing agent. Use sodium diphenylamine sulfonate as indicator. Use potassium dichromate standard titration solution to titrate the reduced amount of iron.4 ReagentsUnless otherwise stated, only analytically pure reagents and distilled or deionized water or water with equivalent purity are used in the analysis. 4.1 Sodium peroxide. 4.2 Hydrochloric acid (ρ1.19 g/mL).5 Specimen5.1 Specimen The granularity of the specimen shall be less than 160 µm. 5.2 Determination of wet reserved water amount While analyzing specimen, determine the wet reserved water amount according to YS/T 820.24-2012.6 Analysis steps6.1 Test material Weigh 0.20 g of specimen, to the nearest of 0.0001 g. 6.2 Determination frequency Carry out the determination twice, independently. Take the mean value. 6.3 Blank test Carry out the blank test with test material (see 6.4.4 for requirements). 6.4 Determination 6.4.1 Decomposition of test material Place the test material (6.1) in a 30mL corundum crucible. Add 2g~3g of sodium peroxide (4.1). Mix well. Then add 1 g of sodium peroxide (4.1) to cover. Melt in a muffle furnace at 800°C for 8min~10min. Take out and cool for a while. Leach in a 300mL beaker that containing 40mL of water. Add 25 mL of hydrochloric acid (4.2). Heat on an electric furnace to near boiling. 6.4.2 Reduction Immediately drop stannous chloride solution (4.9), reduced iron (III). Keep stirring the crucible and solution till the solution becomes light yellow. Clean the inner wall of the beaker with small amount of water. Cool with running water to room temperature. Add 15 drops of sodium tungstate solution (4.13) as indicator. Reduce the remaining iron (III) with titanium trichloride solution. Keep stirring till the solution becomes blue. 6.4.3 Titration While stirring, drop the potassium dichromate solution (4.8) till colorless. Add8 Precision8.1 Repeatability For the measured values of two independent test results obtained under repeatability conditions, within the average range given below, the absolute difference between these two test results does not exceed the repeatability limit (r); if it exceeds the repeatability limit (r), it shall not exceed 5%. The repeatability limit (r) is obtained by linear interpolation according to the data in Table 1. Table 1 -- Repeatability limit 8.2 Reproducibility For the measured values of two independent test results obtained under reproducibility conditions, within the average range given below, the absolute difference between these two test results does not exceed the reproducibility limit (R); if it exceeds the reproducibility limit (r), it shall not exceed 5%. The reproducibility limit (R) is obtained by linear interpolation according to the data in Table 2. Table 2 -- Reproducibility9 Test reportThis clause specifies the content contained in the test report. It shall at least give the following information. - specimen; - YS/T 820.3-2012, the standard used; - analysis results and representation; - differences between basic analysis steps; - abnormal phenomena observed in the determination; ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. |
