MT/T 747-1997 English PDF

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MT/T 747-1997: Technical condition for sodium humate used as boiler scale inhibitor

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Basic data

Standard ID: MT/T 747-1997 (MT/T747-1997)
Description (Translated English): Technical condition for sodium humate used as boiler scale inhibitor
Sector / Industry: Coal Industry Standard (Recommended)
Classification of Chinese Standard: G77
Classification of International Standard: 75.160.10
Word Count Estimation: 7,788
Date of Issue: 12/12/1997
Date of Implementation: 7/1/1998
Quoted Standard: GB/T 1574-1995; GB/T 6679-1986; ZB G21 005-1987
Summary: This standard specifies the low-pressure boiler scale inhibitor with humic acid sodium technical requirements, surveying methods, inspection rules, packaging, labeling, transport and storage. This standard applies to the weathered coal as raw material prepared solid sodium humic acid.

MT/T 7:

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Technical condition for sodium humate used as boiler scale inhibitor ICS 75.160.10 G77 People's Republic of China Coal Industry Standard Technical conditions of sodium humate for boiler scale inhibitor Technical condition for sodium humate used as boiler scale inhibitor 1997-12-12 released.1998-07-01 implemented Published by the Ministry of Coal Industry of the People's Republic of China

Contents

Foreword Ⅱ 1 Scope 1 2 Normative references 1 3 Technical requirements 1 4 Determination method 1 5 Inspection rules 3 6 Packaging, marking, transport and storage 4

Foreword

This standard is based on Henan Province local standard DB/410000G86002-88 sodium humate and production practice since 1982 customized. There are currently no international or national standards available. The simultaneous use of sodium humate and sodium carbonate can reduce the scale formation speed and has good anti-scale performance. Use this product to improve anti-scaling Efficiency, reduce water treatment costs, and extend the life of the boiler. At present, this product has been widely used in China. To make this industry healthy Kang Development, specially formulated this standard. This standard is proposed by the Department of Science, Technology and Education of the Ministry of Coal Industry. This standard is under the jurisdiction of the National Coal Standardization Technical Committee. This standard was drafted. Luoyang Branch of Henan Coal Science Research Institute. The main drafters of this standard. Liu Jialong, Zhang Jingdong, Liu Jianxin. This standard is entrusted to the Luoyang Branch of Henan Coal Research Institute for interpretation. People's Republic of China Coal Industry Standard Technical conditions of sodium humate for boiler scale inhibitor Technical condition for sodium humate used as boiler scale inhibitor MT/T 747-1997 Approved by the Ministry of Coal Industry of the People's Republic of China.1997-12-12

1 Scope

This standard specifies the technical requirements, determination methods, inspection rules, packaging, marking, transportation and Storage. This standard applies to solid sodium humate prepared from weathered coal.

2 Reference standards

The following standards contain provisions that, through reference in this standard, constitute provisions of this standard. When this standard was published, the editions shown were all Is effective. All standards will be revised, and all parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T 1574-1995 analysis method of coal ash GB/T 6679-86 General Rules for Sampling Solid Chemical Products ZB G21 005-87 sodium humate

3 Technical requirements

3.1 Appearance. black particles or powder. 3.2 The product shall meet the requirements of Table 1. Table 1 Indicator name Moisture,% (Received base) Humic acid,% (Dry basis) Calcium oxide, magnesium oxide,% (Dry basis) Water insoluble matter,% (Dry basis) PH of 1% solution Index ≤15 ≥50 ≤2 ≤20 8 ~ 10 Remarks General project Important project Important project General project General project

4 Determination method

Except for special provisions in this standard, analytical reagents and distilled water or water of equivalent purity are used. 4.1 Moisture determination Press ZB G21 005-87 Determination of the provisions of 2.4. 4.2 Determination of Humic Acid Yield 4.2.1 Method summary Extract sodium humate from the sample with water. In a strongly acidic solution, oxidize the carbon in humic acid to carbon dioxide with potassium dichromate. The consumption of potassium dichromate and the carbon coefficient of humic acid were used to calculate the yield of humic acid. 4.2.2 Reagents 4.2.2.1 Sulfuric acid (GB 625). Relative density 1.84. 4.2.2.2 Potassium dichromate solution. c 16K2Cr2O7 = 0.8 mol/L. Weigh 40 g of potassium dichromate (GB 642) in 1000 mL of water Medium, stored in small-mouth bottles for later use. 4.2.2.3 Standard solution of potassium dichromate. c 16K2Cr2O7 = 0,1 mol/L. Dry potassium dichromate (GB 642) at 130 ℃ for about 3 hours, Place in a desiccator to cool to room temperature, then accurately weigh 4.9036 g in a beaker, dissolve in water, then transfer to 1000 mL volumetric flask, Dilute to the mark with water and shake well. 4.2.2.4 Phenanthroline indicator. Weigh 1.5 g-phenanthroline (GB 1293) and 1 g Ammonium ferrous sulfate (GB 661) Dissolved in 100 mL of water Medium, stored in brown bottles. 4.2.2.5 Ammonium ferrous sulfate standard solution. c (Fe2) = 0.1 mol/L. Weigh 40 g Ammonium ferrous sulfate hexahydrate (GB 661) Dissolve in moderate amount Water, add 20 mL of sulfuric acid (4.2.2.1), diluted to 1000 with water mL, shake well and put into a brown bottle. The concentration of ferrous ammonium sulfate is not Stable, need calibration before use. Can put two clean aluminum sheets or cable aluminum wires in the bottle to keep the solution concentration stable for a long time Calibration. The concentration of the solution is calibrated as follows. Accurately draw mL of potassium dichromate standard solution at 250 In a conical flask, add 70 mL ~ 80 mL of water and 10 mL sulfuric acid (4.2.2.1), add 3 drops of phenanthroline indicator after cooling, titrate with the ammonium ferrous sulfate solution to be calibrated, the solution changes from orange red to brick red Color is the end. The concentration of ferrous ammonium sulfate standard solution is calculated according to formula (1). c (Fe2) = V × 0.1 (1) Where. c (Fe2) --- the concentration of ferrous ammonium sulfate standard solution, mol/L; V --- Volume of ammonium ferrous sulfate solution consumed in titration, mL. 4.2.3 Measurement steps Weigh about 0.2 g (accurate to 0.0002 g) Sample at 250 In a conical flask, add 70 mL of water, insert a small glass funnel at the mouth, and set Heat extraction in boiling water bath 30 min, and often shake, take out the Erlenmeyer flask, after cooling, transfer all the solution and residue to 100 mL volumetric flask Medium, make up to volume with water, shake well, dry filter with medium speed filter paper, discard the first 10 mL filtrate, continue filtering to filtrate 30 mL ~ 50 For mL, accurately transfer 5.0 with a pipette mL of filtrate at 250 mL conical flask, add 5.0 with a pipette mL of potassium dichromate Liquid, slowly add 15 mL of sulfuric acid (4.2.2.1), shake and place in a boiling water bath and heat for 30 min, and shake frequently, remove the Erlenmeyer flask and cool to At room temperature, add 80 mL of water and 3 drops of phenanthroline indicator, titrated with ammonium ferrous sulfate standard solution, the solution changed from orange to green with brick Red is the end. At the same time, a blank test is performed according to the above steps. 4.2.4 Expression of results The yield of humic acid is calculated according to formulas (2) and (3). HAar = 0.003 (V0-V1) · c (Fe2) 0.64 × m × b × 100 (2) HAd = HAar × 100-Mar (3) Where. HAar --- the received humic acid yield of the sample,%; HAd --- dry humic acid yield of the sample,%; V1 --- Volume of ammonium ferrous sulfate standard solution consumed by the sample, mL; V0 --- volume of ammonium ferrous sulfate standard solution consumed in blank test, mL; c (Fe2) --- the concentration of ferrous ammonium sulfate standard solution, mol/L; 0.003 --- with 1.00 mL, c (Fe2) = 1.000 mol/L equivalent carbon mass of ferrous ammonium sulfate solution, g; 0.64 --- carbon coefficient of weathered coal humic acid; a --- the total volume of the sample solution, mL; b --- the volume of the sample solution taken during the measurement, mL; m --- the mass of the sample, g; Mar --- received moisture of the sample,%. During the calculation process, one digit after the decimal point is taken, and the calculation result is rounded to the nearest digit. 4.2.5 Tolerance The absolute difference between the results of the parallel measurement of the same test chamber of the sample shall meet the requirements of Table 2. Table 2 Humic acid yield range,% 20 ~ 50 ≥50 Absolute difference,% ≤2 ≤3 4.3 Determination of calcium oxide and magnesium oxide Press GB/T 1574-1995 Determination of 6.5 and 6.6 or 7.3 and 7.4. 4.4 Determination of water insoluble matter Press ZB G21 005-87 Determination of the provisions of 2.7. 4.5 pH measurement Press ZB G21 Determination of the provisions of 2.5 in 005-87.

5 Inspection rules

5.1 The product shall be inspected by the quality inspection department of the production plant, and the products shall not be delivered until the inspection is qualified and a quality certificate is issued. Quality certificate content Including. product name, batch number, inspection result, inspector name, inspection date, this standard number, manufacturer name. 5.2 The products are inspected batch by batch, and the quality of each batch does not exceed 2 t. 5.3 Preparation of sampling and analysis samples 5.3.1 The products shall be sampled according to the regulations in Table 3. table 3 Total number of bags 1 ~ 10 total number of bags 11 ~ 49 11 50 ~ 64 12 65 ~ 81 13 Sampling probe (GB/T 6679 Appendix A) Insert diagonally from one side of the mouth of the bag to the opposite side of the bag Sampling, the total number of samples taken must not be Less than 2 kg, and then use a divider or heap cone quarter method to reduce the sample to 500 g, divided into two clean, dry In the mouth bottle or plastic bottle, stick a label indicating the name of the manufacturer, product name, batch number, sampling location, sampling date, and name of the sampling person. A bottle For product quality analysis, the other bottle is stored in a sealed 60 d, for reference. 5.3.2 Take 100 g scale down, grind until all pass 0.2 mm sieve standard sieve, mix well, place in a clean, dry bottle for For analysis. 5.4 Decision rules 5.4.1 If there is an important indicator that does not meet this standard, it should be resampled from twice the number of sampling bags. When the requirements of this standard are not met, the product is judged to be unqualified. 5.4.2 If there are two general items that do not meet this standard, re-sampling shall be carried out again from twice the number of sampling bags. When it does not meet this standard, it is judged that the product is unqualified. 6 Packaging, marking, transportation and storage 6.1 Products are packed in woven bags lined with plastic bags. Net weight 25 kg ± 0.25 kg. 6.2 The following signs should be marked on the packaging bag. product name, trademark, net weight, and factory name. 6.3 During transportation, it should be put into a covered transportation tool to prevent rain and snow. 6.4 Store the product in a dry place. ......

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