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YS/T 521.2-2019 English PDF

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YS/T 521.2-2019: Methods for chemical analysis of blister copper. Part 2: Determination of gold and silver contents. Dry and wet fire assay method and direct fire assay method
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YS/T 521.2: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
YS/T 521.2-2019English349 Add to Cart 3 days [Need to translate] Methods for chemical analysis of blister copper. Part 2: Determination of gold and silver contents. Dry and wet fire assay method and direct fire assay method Valid YS/T 521.2-2019
YS/T 521.2-2009English160 Add to Cart 0--9 seconds. Auto-delivery Methods for chemical analysis of blister copper. Part 2: Determination of gold and silver contents. Fire assay method Obsolete YS/T 521.2-2009
YS/T 521.2-2006English239 Add to Cart 2 days [Need to translate] Methods for chemical analysis of blister copper -- Determination of arsenic content Obsolete YS/T 521.2-2006

PDF similar to YS/T 521.2-2019


Standard similar to YS/T 521.2-2019

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Basic data

Standard ID YS/T 521.2-2019 (YS/T521.2-2019)
Description (Translated English) Methods for chemical analysis of blister copper. Part 2: Determination of gold and silver contents. Dry and wet fire assay method and direct fire assay method
Sector / Industry Nonferrous Metallurgy Industry Standard (Recommended)
Classification of Chinese Standard H13
Classification of International Standard 77.120.30
Word Count Estimation 15,145
Date of Issue 2019-08-02
Date of Implementation 2020-01-01
Older Standard (superseded by this standard) YS/T 521.2-2009
Regulation (derived from) Natural Resources Department Announcement No. 7 of 2019
Issuing agency(ies) Ministry of Industry and Information Technology
Summary This standard specifies the determination method of gold and silver content in blister copper. This standard applies to the determination of gold and silver content in blister copper. Measuring range: gold 2.00g/t��340.00g/t; silver 30.0g/t��10300.0g/t.

YS/T 521.2-2009: Methods for chemical analysis of blister copper. Part 2: Determination of gold and silver contents. Fire assay method


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Methods for chemical analysis of blister copper.Part 2. Determination of gold and silver contents.Fire assay method ICS 77.120.30 H13 People's Republic of China Nonferrous Metals Industry Standard YS/T 521.2-2009 Replacing YS/T 521.3-2006 Crude copper chemical analysis method Part 2. Determination of the amount of gold and silver Released on.2009-12-04 2010-06-01 implementation Ministry of Industry and Information Technology of the People's Republic of China

Foreword

YS/T 521-2009 "Chemical Analysis Method for Crude Copper" is divided into 6 parts. --- Part 1. Determination of copper content - Iodometric method --- Part 2. Determination of gold and silver quantities - Fire test method --- Part 3. Determination of arsenic content Method 1 Hydride Generation-Atomic Fluorescence Spectrometry Method 2 Potassium bromate titration -- Part 4. Determination of lead, bismuth and bismuth content - AAS -- Part 5. Determination of zinc and nickel content - AAS -- Part 6. Determination of arsenic, lead, antimony, bismuth, zinc and nickel - Inductively coupled plasma atomic emission spectrometry This part is the second part of YS/T 521. This part replaces YS/T 521.3-2006 "Determination of gold and silver in chemical analysis of crude copper" (formerly GB/T 5120.3- 1995). Compared with YS/T 521.3-2006, this section has the following changes. --- Modified the text format; --- Added precision and quality assurance and control terms. This part is proposed and managed by the National Nonferrous Metals Standardization Technical Committee. This section is responsible for drafting unit. Daye Nonferrous Metals Corporation. Participated in the drafting of this section. Beijing Research Institute of Mining and Metallurgy, Jiangxi Copper Company, Jinchuan Group Company. The main drafters of this section. Feng Congxin, Wang Yongbin, Yuan Yuxia, Chen Zhaoyan, Chen Yu, Wang Datong, Shi Jingjing, Meng Dejun. The previous versions of the standards replaced by this section are. ---GB 5120.2-1985, GB/T 5120.3-1995; ---YS/T 521.3-2006. YS/T 521.2-2009 Crude copper chemical analysis method Part 2. Determination of the amount of gold and silver

1 Scope

This part of YS/T 521 specifies the method for determining the amount of gold and silver in blister copper. This section applies to the determination of gold and silver in blister copper. Measuring range. gold mass fraction ≥ 0.5g/t; silver mass fraction ≥20g/t.

2 Method summary

The sample is dissolved in sulfuric acid, and the gold and silver precipitate obtained by filtering the copper is ashed, compounded and melted to obtain an appropriate amount of lead buckle. Lead buckle The amount of gold and silver is then determined by the gravimetric method. The correction method is determined by adding pure copper as the matrix and adding pure gold and sterling silver along with the sample, according to the recovery rate. Correction or correction by ash dish and slag melting method.

3 reagents

Unless otherwise stated, only analytically pure reagents and distilled or deionized water or water of comparable purity were used in the analysis. 3.1 Sodium carbonate. industrial pure, powdery. 3.2 Lead oxide. industrial pure, powdery (gold mass fraction ≤ 0.05μg/g; silver mass fraction ≤ 5μg/g). 3.3 Borax. Powder. 3.4 Starch. Industrial pure, powdery. 3.5 Silica. industrially pure, powdered. 3.6 Sodium chloride. industrially pure, powdered. 3.7 gold (mass fraction ≥ 99.99%). 3.8 Silver (mass fraction ≥ 99.99%). 3.9 Copper (mass fraction ≥ 99.95%). 3.10 Sulfuric acid (ρ1.84g/mL). 3.11 Nitric acid (1+1). 3.12 Nitric acid (1+7). 3.13 Mercuric sulfate solution (23g/L). 3.14 sodium chloride solution (10g/L). 3.15 acetic acid (1+3).

4 Instruments and equipment

4.1 Balance. 4.1.1 Ultra-micro balance. 0.001mg. 4.1.2 Microbalance. Sensing amount 0.01mg. 4.1.3 Analytical balance. Sensing amount 1mg. 4.1.4 Pallet balance. 1 g. 4.2 Test furnace. 4.3 Grey dish machine. YS/T 521.2-2009 4.4 Porcelain crucible. low, 30mL. 4.5 Clay 坩埚. 120mm high, 90mm upper outer diameter, 50mm lower outer diameter. 4.6 Ashware. Ashes or ash or magnesite. General specifications. height 30mm, upper inner diameter 35mm, lower outer diameter 40mm, depth about 17mm.

5 Analysis steps

5.1 Samples The mass ratio after sieving is collectively referred to as a 20 g sample (when the mass fraction of gold is < 10 g/t, collectively referred to as 40 g of the sample), to the nearest 0.001 g. The measurements were performed twice independently and averaged. 5.2 Blank test 5.2.1 The blank test of lead oxide and pure copper used in the correction by the A method (ie, “plus pure gold sterling silver correction method”). weigh the pure copper scraps three Servings, 20g each, to the nearest 0.001g. The following is carried out in accordance with 5.3.1 to 5.3.5. 5.2.2 The blank test for the lead oxide used in the correction by the B method (ie “grey dish and slag fusion correction method”). weigh 25 g of sodium carbonate (3.1), 120g of lead oxide (3.2), 10g of borax (3.3), 25g of silica (3.5), 3g of starch (3.4) in clay crucible, after mixing, about 10 mm thick sodium chloride (3.6). The following is carried out in accordance with 5.3.3 to 5.3.5. 5.3 Determination 5.3.1 Wet processing 5.3.1.1 Place the sample (5.1) in a 800mL high-type beaker. According to the sample conditions listed in Table 1, add the corresponding help in order. Solvent and solvent (mixed with each reagent). Table 1 Sample processing table Sample condition Co-solvent addition amount/mL solvent addition amount/mL Nitric acid (3.12) Mercuric sulfate solution (3.13) Sulfuric acid (3.10) Au≥10g/t Easy to dissolve 20 - 60 ~ 80 Insoluble - 10 60-80 Au< 10g/t Easy to dissolve 30 - 130 Insoluble - 15 130 5.3.1.2 Cover the watch glass and steam to a paste on a high temperature electric oven. Remove and cool to room temperature. Add 300mL of water (the mass fraction of gold is small) At 10 g/t of sample, add 500 mL of water) and 20 mL of sodium chloride solution (3.14), add a small amount of filter paper pulp, wash the watch glass and cup with water. Wall, boil for about 5 min. Remove the shake beaker and wash the watch glass and cup wall with warm water. After a little cold, filter with medium speed quantitative filter paper. 5.3.1.3 Transfer all the sediment to the filter paper. Wash the precipitate with warm water until there is no blue color. Connect the filter rod and the wall of the filter paper The filter paper loaded with the precipitate was placed in a clay crucible and placed in a gold furnace. Ashing was carried out from room temperature to about 500 ° C until ashing was completed. 5.3.2 Ingredients The ash-containing clay is cooled to room temperature, and 20 g of sodium carbonate (3.1), 60 g of lead oxide (3.2), 7 g of borax (3.3), and 7 g are added. Silica (3.5), 3 g of starch (3.4). Stir well and cover 10 mm thick sodium chloride (3.6). 5.3.3 Melting The clay crucible with the good material is placed in a gold furnace at 800 ° C, and the temperature is raised to 1100 ° C in 30 min to 40 min, and the temperature is kept for 15 min. (The total melting time is 45 min to 55 min). Pour the melt into a preheated and oiled cast iron mold and cool the lead It is a square shape. The slag is taken into the original clay bowl for use (corrected by the B method). 5.3.4 ash blowing 5.3.4.1 Place the lead buckle in a ash dish that has been preheated for 20 minutes in a 900 °C test furnace, and close the furnace door until the floating film on the surface of the lead liquid disappears. After the (hulling), the furnace door is slightly opened, and the furnace temperature is lowered to 840 ° C to 860 ° C for ash blowing. The ash blow ends when the granules appear to flash. Gray The dish was moved to the door of the furnace, and it was slightly cold and placed in a dish. YS/T 521.2-2009 5.3.4.2 Use a small tweezers to remove the gold and silver particles from the ash dish, place 15 mL of acetic acid (3.15) in a porcelain crucible, and boil on a hot plate. Remove to about 5 mL, wash three times with warm water, and discard the wash solution. The gold and silver particles retained in the porcelain crucible are placed on a high temperature electric furnace and baked. Remove and weigh to room temperature (accurate to 0.01 mg). Keep the ash dish for use (corrected by Method B). 5.3.5 points The weighed gold and silver granules are placed on a small steel anvil, sliced, placed in a porcelain crucible, and about 5 mL of hot nitric acid (3.12) is added and placed in a low The hot electric plate is divided into gold. When steamed to about 2 mL, about 5 mL of hot nitric acid (3.11) was added. Steam to about 2mL, remove, cool, use hot water Wash three times. Place the porcelain crucible containing gold grains on a high temperature electric hob and dry for 5 minutes, remove, cool to room temperature, and weigh (accurately 0.001 mg). 5.3.6 Correction 5.3.6.1 Correction method Method A. Weigh the pure copper with the same amount of sample, and add pure gold and pure silver close to the sample content. The following is carried out in accordance with 5.3.1 to 5.3.5. Calculate the recovery rate of pure gold and sterling silver to correct. Method B. After pulverizing the retained ash dish and slag, placing it in the original clay mash, adding 20 g of sodium carbonate (3.1), 30 g of lead oxide (3.2), 20 g of borax (3.3), 10 g of silica (3.5), 4 g of starch (3.4), and homogenized, covered with 10 mm thick sodium chloride (3.6). Press below 5.3.3 to 5.3.5. 5.3.6.2 Correction range When the mass fraction of gold is measured to be ≥3.0 g/t or the mass fraction of silver is ≥50 g/t, the correction is started. If the measured mass fraction of gold When ≥50g/t or the mass fraction of silver ≥1000g/t, the method B is used to correct twice.

6 Calculation of analysis results

6.1 When using the A method to correct, calculate the mass fractions Au and Ag of gold and silver according to formula (1) and formula (2). The values are expressed in g/t. 103 (1) Ag= 103 (2) In the formula. 犽1---gold recovery rate (%); 犽2---Recovery rate of silver (%). 犽1 and 犽2 are calculated according to equations (3) and (4), respectively, and the values are expressed in %. 100 (3) 100 (4) In the formula. YS/T 521.2-2009 6.2 When using the B method to correct, calculate the mass fractions Au and Ag of gold and silver according to formula (5) and formula (6). The value is expressed in g/t. 103 (5) Ag= 103 (6) In the formula. The resulting gold amount is expressed to one decimal place; the silver amount is expressed to the integer position.

7 precision

7.1 Repeatability The measured values of two independent test results obtained under repetitive conditions, within the average range given below, the two test results Interpolation method. Table 2 Repeatability Gold mass fraction/(g/t) 9.2 29.9 59.9 100.2 141.4 190.5 Silver mass fraction/(g/t) 18 113 505 1017 1962 3098 4154 7.2 Reproducibility The measured values of the two independent test results obtained under reproducibility conditions are within the average range given below, and the two test results The absolute difference does not exceed the reproducibility limit (R), the reproducibility (R) exceeds 5%, and the reproducibility (R) is linear within the data of Table 3. Interpolation. Table 3 Reproducibility Gold mass fraction/(g/t) 9.2 29.9 59.9 100.2 141.4 190.5 Reproducibility limit (R)/(g/t) 1.0 1.8 2.8 3.5 4.2 5.4 Silver mass fraction/(g/t) 18 113 505 1017 1962 3098 4154 Reproducibility limit (R)/(g/t) 11 22 40 55 81 114 146 Note. When the mass fraction of gold is 0.5g/t, the reproducibility limit (R) is 0.3g/t. YS/T 521.2-2009

8 Quality Assurance and Control

Apply national standard samples or industry-standard samples (when the current two are not available, you can also use control standards instead), weekly or bi-weekly The validity of the standard of this analytical method is checked once. When the process is out of control, you should find out the cause, correct the error, and re-check. YS/T 521.2-2009

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