YS/T 575.29-2023 PDF EnglishUS$219.00 · In stock · Download in 9 seconds
YS/T 575.29-2023: Methods for chemical analysis of bauxite - Part 29: Determination of available alumina and reactive silica Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid
Similar standardsYS/T 575.29-2023: Methods for chemical analysis of bauxite - Part 29: Determination of available alumina and reactive silica---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/YST575.29-2023 YS NONFERROUS METAL INDUSTRY STANDARD ICS 71.040.40 CCS H 30 Methods for chemical analysis of bauxite - Part 29. Determination of available alumina and reactive silica Issued on: DECEMBER 20, 2023 Implemented on: JULY 01, 2024 Issued by. Ministry of Industry and Information Technology of PRC Table of ContentsForeword... 3 Introduction... 6 1 Scope... 7 2 Normative references... 7 3 Terms and definitions... 7 4 Principle... 7 5 Reagents... 8 6 Instruments... 9 7 Sample... 9 8 Test steps... 10 9 Test data processing... 11 10 Precision... 12 11 Test report... 13 Methods for chemical analysis of bauxite - Part 29. Determination of available alumina and reactive silica1 ScopeThis document describes the method for the determination of available alumina and reactive silicon in bauxite ore. This document is applicable to the determination of available alumina and reactive silicon in bauxite ore. The determination range for available alumina is 30.00% ~ 60.00%; the determination range for reactive silicon is 0.10% ~ 10.00%.2 Normative referencesThe contents of the following documents, through normative references, constitute essential provisions of this document. For dated references, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies to this document. GB/T 6682 Water for analytical laboratory use - Specification and test methods GB/T 8170 Rules of rounding off for numerical values & expression and judgement of limiting values3 Terms and definitionsThere are no terms or definitions that require definition in this document.4 PrincipleBauxite ore is dissolved in sodium hydroxide solution at a specific temperature and time. A certain volume of the solution is aliquoted and determined by the EDTA volumetric method. The alumina content obtained is the effective alumina content in the bauxite ore. The residue is treated with acid; a certain volume of the treated solution is aliquoted and mixed with the previous solution. It is determined by silicate molybdenum blue spectrophotometry. The silica content obtained is the reactive silicon content in the bauxite ore.5 ReagentsUnless otherwise specified, only reagents of confirmed analytical grade and grade II water meeting the requirements of GB/T 6682 are used in the analysis. 5.1 Hydrochloric acid (1 + 11). 5.2 Hydrochloric acid (1 + 5). 5.3 Aqueous ammonia (1 + 5). 5.4 Sodium hydroxide solution (50 g/L, calculated as Na2O). Weigh 64.516 g of sodium hydroxide into a 2000 mL beaker; dissolve in water; cool to room temperature; use water to dilute it to 1000 mL; mix thoroughly; transfer to a polyethylene bottle. 5.5 Acetic acid-sodium acetate buffer solution (pH approximately 5.7). Weigh 121 g of anhydrous sodium acetate into a 2000 mL beaker; dissolve in 700 mL of water; then add 9.6 mL of glacial acetic acid (ρ = 1.05 g/mL); use water to dilute to 1000 mL. 5.6 Ammonium molybdate solution (100 g/L). 5.7 Sulfuric acid-oxalic acid-ferrous ammonium sulfate mixed solution. Weigh 10 g of ferrous ammonium sulfate into a 2000 mL beaker; add 400 mL of water to dissolve it. Then add 60 mL of sulfuric acid (1 + 1). Weigh 10 g of oxalic acid into a 2000 mL beaker; add 300 mL of water to dissolve it. After cooling, mix with the previous solution and use water to dilute to 1000 mL. 5.8 Zinc standard titration solution (0.02942 mol/L). Weigh 2.3945 g of standard zinc oxide (calcined in a high-temperature furnace at 800 °C ± 50 °C to constant weight); moisten with a small amount of water; dissolve in 30 mL of hydrochloric acid (1 + 1); cool it; transfer to a 1000 mL volumetric flask; use water to dilute to the mark; mix thoroughly. 5.9 Prepare and calibrate the disodium ethylenediaminetetraacetic acid (EDTA) standard titrant solution (c ≈ 0.05 mol/L) as follows. a) Weigh 19.8 g of disodium ethylenediaminetetraacetic acid into a 500 mL beaker. Dissolve the solution in 200 mL of water. Transfer the solution to a 1000 mL volumetric flask; use water to dilute to the mark; mix thoroughly. b) Pipette three 15.00 mL portions of the zinc standard titrant solution (5.8) into separate 250 mL conical beakers. Add 80 mL of water and 2 drops of xylenol orange indicator (5.12). Adjust the solution to an orange color with aqueous ammonia (5.3). Add 15 mL of buffer solution (5.5) and 1 drop of bromocresol green indicator (5.11). Titrate with the EDTA standard titrant solution. The endpoint is reached when the solution changes from purple to green. Perform a blank test at the same time. 5.10 Silicon dioxide standard solution. Weigh 0.1000 g of silicon dioxide (wSiO2 ≥ 99.99%), that has been pre-calcined at 1000 °C for 2 h and cooled to room temperature, into a platinum crucible; add 3 g of anhydrous sodium carbonate; mix thoroughly. Cover the crucible with 1 g of anhydrous sodium carbonate; place it in a 950 °C furnace to melt for 12 minutes. Remove and cool it; place in a plastic cup. Leach with 200 mL of boiling water. Rinse the crucible and lid. Cool to room temperature; transfer to a 1000 mL volumetric flask; use water to dilute to the mark; mix it; store in a plastic bottle. 1 mL of this solution contains 0.1 mg of silica.6 Instruments6.1 Dissolution apparatus. Microwave digester with 100 mL polytetrafluoroethylene digestion tubes. Note. Other dissolution apparatus may be selected based on sample characteristics. 6.2 Spectrophotometer.7 SampleGrind the sample to pass through a standard sieve with a pore size of 75 µm; dry it in an oven at 110 °C ± 5 °C for 2 h; place it in a desiccator; cool it to room temperature for later use.8 Test steps8.1 Test material Weigh 1.00 g of sample (7), accurate to 0.0001 g. 8.2 Parallel test Perform two parallel tests and take the average value. 8.3 Blank test Perform a blank test with the sample. 8.4 Determination 8.4.1 Place the sample (8.1) in a digestion tube; add 20.0 mL of sodium hydroxide solution (5.4); shake well; transfer to the dissolution apparatus (6.1); keep it at 143 °C for 30 min. Note. The holding temperature and time can be adjusted according to different samples. 8.4.2 Transfer the contents of the dissolution apparatus (8.4.1) to a 250 mL volumetric flask with water; use water to dilute to the mark; mix thoroughly. Filter the test solution through quantitative filter paper; transfer the entire contents of the volumetric flask into a funnel; set aside the residue; place the filtrate in a 250 mL beaker. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of English version of YS/T 575.29-2023 be delivered?Answer: The full copy PDF of English version of YS/T 575.29-2023 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice.Question 2: Can I share the purchased PDF of YS/T 575.29-2023_English with my colleagues?Answer: Yes. The purchased PDF of YS/T 575.29-2023_English will be deemed to be sold to your employer/organization who actually paid for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countriesQuestion 4: Do you accept my currency other than USD?Answer: Yes. www.ChineseStandard.us -- YS/T 575.29-2023 -- Click this link and select your country/currency to pay, the exact amount in your currency will be printed on the invoice. Full PDF will also be downloaded/emailed in 9 seconds.How to buy and download a true PDF of English version of YS/T 575.29-2023?A step-by-step guide to download PDF of YS/T 575.29-2023_EnglishStep 1: Visit website https://www.ChineseStandard.net (Pay in USD), or https://www.ChineseStandard.us (Pay in any currencies such as Euro, KRW, JPY, AUD).Step 2: Search keyword "YS/T 575.29-2023". Step 3: Click "Add to Cart". If multiple PDFs are required, repeat steps 2 and 3 to add up to 12 PDFs to cart. Step 4: Select payment option (Via payment agents Stripe or PayPal). Step 5: Customize Tax Invoice -- Fill up your email etc. Step 6: Click "Checkout". Step 7: Make payment by credit card, PayPal, Google Pay etc. After the payment is completed and in 9 seconds, you will receive 2 emails attached with the purchased PDFs and PDF-invoice, respectively. Step 8: Optional -- Go to download PDF. Step 9: Optional -- Click Open/Download PDF to download PDFs and invoice. See screenshots for above steps: Steps 1~3 Steps 4~6 Step 7 Step 8 Step 9 |
