MT/T 764-1997 English PDF

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MT/T 764-1997: Testing method for performance of form dedusting agent in coal mine

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MT/T 764-1997	279	Add to Cart	3 days	Testing method for performance of form dedusting agent in coal mine

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Basic data

Standard ID: MT/T 764-1997 (MT/T764-1997)
Description (Translated English): Testing method for performance of form dedusting agent in coal mine
Sector / Industry: Coal Industry Standard (Recommended)
Classification of Chinese Standard: D09
Classification of International Standard: 73.04
Word Count Estimation: 8,843
Date of Issue: 12/30/1997
Date of Implementation: 6/1/1998
Quoted Standard: GB/T 5748-1985; GB/T 10124-1988; GB 15308-1994; MT 79-1984; MT 506-1996
Regulation (derived from): Development-Reform-Office-Industry (2006) 97
Summary: This standard specifies the surface tension of the mine dust foam agent for invasive dust, corrosive to metal, and expansion ratio measurement method foam 50% dialysate time and collection efficiency. This standard applies to the health and quarantine departments test no harm to human health mine dust foam agent (hereinafter referred to as foam) performance measurement.

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.
Testing method for performance of form dedusting agent in coal mine People's Republic of China Coal Industry Standard Method for measuring the performance of mining foam dust remover Testing method for performance of form dedusting agent in coal mine 1997-12-30 Approved.1998-06-01 Implementation Approved by the Ministry of Coal Industry of the People's Republic of China

Contents

1 Scope 1 2 Normative references 1 3 Definition 1 4 Determination method 1 Method for measuring the performance of mining foam dust remover

1 Scope

This standard specifies the surface tension, wettability of dust, corrosiveness to metal, foaming multiple, foam 50% for mining dust remover. Method for measuring liquid extraction time and dust removal efficiency. This standard is applicable to the performance testing of the foam foam duster (hereinafter referred to as foaming agent) which is not harmful to human health by the health and epidemic prevention department set.

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 5748-85 Method for determination of dust in the air of working places GB/T 10124-88 Test method for uniform immersion and full immersion in metallic materials laboratory GB 15308-94 General technical requirements for foam extinguishing agents MT 79-84 Determination of Dust Concentration and Dispersion MT 506-1996 method for measuring the performance of mine dust remover

3 Definition

This standard uses the following definition. 3.1 Foam dust remover for mining dedusting agent in coal mine Mine dust remover that is miscible with water and produces foam by mechanical methods.

4 Determination method

4.1 Determination of surface tension of foaming agent 4.1.1 Determination principle The torsion force is applied to the steel wire by the rotation of the worm gear pair of the interfacial tension meter, and the platinum ring that the torsion force contacts the liquid surface against the surface The tension is balanced. When the torque continues to increase and the liquid level is broken, the angle of the steel wire torsion is indicated by the cursor on the dial. This value is multiplied by One factor is the surface tension of the liquid. 4.1.2 Instrument a) Interfacial tension meter. range 0 ~ 180 mN/m, minimum division value 0.1 mN/m; b) Thermometer. 0 ~ 50 ℃, scale 0.2 ℃; c) 0.5 g ~ 0.8 g weight set. 4.1.3 Materials and reagents a) absorbent cotton gauze; b) Potassium dichromate (GB/T 642); c) sulfuric acid (GB/T 625); d) drinking water; e) Distilled water. 4.1.4 Determination of ambient temperature ℃ ± 2 ℃. 4.1.5 Sample preparation The foaming agent was dissolved in domestic drinking water according to the volume percentage concentration to prepare a foaming agent solution with a practical concentration. 4.1.6 Determination steps a) Dissolve potassium dichromate in sulfuric acid to make a saturated solution. mL of potassium dichromate saturated solution and 90 Wash with a mixture of mL of sulfuric acid Platinum ring and glass sample cup, rinse with distilled water and then dry with absorbent cotton gauze; b) use 0.5 g ~ 0.8 g weight calibration interface tension meter; c) Insert the platinum ring on the boom arm; d) Pour the sample into the glass sample cup to a depth of 20 mm ~ 25 mm, place the sample glass in the center of the sample holder. Spin-like The pin holder nut, the sample glass and the holder rise together, so that the platinum ring contacts the liquid surface, and the pointer on the arm and the red line on the reflector are heavy. Turn, turning the handle of the turbine increases the torque of the steel wire. When the liquid surface is pulled tight by the platinum ring, the pointer always keeps coincident with the red line. The force continues until the surface tension M is read on the scale when the film is broken. 4.1.7 Calculation Press MT 4.7 of 506. 4.1.8 Expression of results One sample was measured three times, and the average value was taken as the measurement result. 4.2 Determination of wettability of foaming agent to dust 4.2.1 Determination principle The infiltration of liquid into dust is accomplished by the capillary action of the dust particle gap, so that the original solid-gas interface of the dust particles is replaced by the solid-liquid interface. of. Measuring the wetting height over a certain period of time indicates the wettability of the liquid to dust. 4.2.2 Equipment a) Drug balance. 0 ~.200 g, Sensitivity 0.01 g; b) Capillary method for measuring the wettability of dust. shown in Figure 1. Glass funnel tube inner diameter 7 mm ± 0.4 mm, total scale from the bottom Length 240 mm, scale interval 1 mm. Motor cam vibrates the support table with a vibration frequency of 1.5 Hz/s, amplitude 3 mm; 1-motor cam; 2-spring; 3-foam agent disc; 4-glass funnel; 5-valve; 6-foam agent test solution Figure 1 Capillary method for measuring dust wettability c) Timer with a division value of 1 s; d) Qualitative filter paper (fast), GB/T 1915; e) Oven. 0 ~.200 ℃; f) thermometer. 0 ~.200 ℃, division value 1 ℃; 8) Test dust. coal mine dust test dust (coal dust); h) dryer. 4.2.3 Sample preparation Use the drinking water to prepare a foaming agent at the actual concentration for the infiltration test. 4.2.4 Determination method Press MT 6.4.1 of 506. 4.2.5 Expression of results Take the average value of the dust infiltration height in the three glass funnel tubes as the measurement result, and the deviation between each measurement value and the average value should be less than or It is equal to 10%, otherwise it needs to be re-measured. 4.3 Determination of Corrosiveness of Foam to Metals Press GB/* 10124 standard hot-rolled ore steel 24Mn2K is used to prepare metal test pieces. Use the drinking water to prepare the foaming agent with the actual concentration as the test solution. Press GB/* The planned intermittent corrosion test method specified in 10124 Appendix A determines the corrosion rate of the test solution to each group of metal test pieces. Set the measured corrosion rate of each group of metal test pieces according to GB/* 10124 List of methods specified in Appendix A for corrosive changes in test solutions and metals Comprehensive evaluation of changes in corrosion rate. 4.4 Determination of foaming factor and 50% leaching time of foaming agent Press GB 15308 in 5.6.2. 4.5 Determination of dust removal efficiency 4.5.1 Instruments and equipment a) Foam dust removal experimental device. as shown in Figure 2. Hexagonal test cylinder, opposite distance 1 m, length 8 m, side spacing 0.5 m 可可 Closed sampling port; 1- foam generator; 2- valve; 3- dust generating device; 4- test cylinder; 5- foam nozzle; 6-suction pump; 7-flow regulating valve; 8-flow meter; 9-fan; 10- sampling head Figure 2 Foam dust removal efficiency measuring device b) The sampling head and filter membrane of the flowmeter suction pump conform to GB/T 5748 requirements; c) Foaming machinery meets GB 15308 of 5.6.2; d) Analytical balance. range 0 ~.200 g, sensitivity 0.1 mg; e) Dust particle size analyzer. Determination 1 μm ~ 150 Dust mass percentage of each particle size in the μm range; f) dryer. 4.5.2 Preparation of test solution Use the drinking water to prepare the actual concentration foam solution as the test solution. 4.5.3 Measurement procedure a) The distance between the dust sampling point and the foam opening is greater than the maximum distance that the foam floats. Put the standard test dust in the dust generating device and adjust the hair The dust device makes the dust concentration in the air at the sampling point to be (250 ± 50) mg/m3; b) Use the filter dust measurement method to collect the dust at the sampling point with the foaming agent and the dust without the foaming agent 8 times each, and calculate the dust according to formula (1) Concentration, the average value of 8 times represents the dust concentration C1 and C2 in the air without foaming agent and dusting with foaming agent; c) Calculation of dust concentration. The dust concentration is calculated as follows. C = m2-m1 (1) Where. C --- gas dust concentration, mg/m3 m1 --- mass of filter membrane before collecting dust, mg; m2 --- mass of filter membrane after collecting dust, mg; q --- sampling flow, L/min; t --- sampling time, min. d) Use the dust-containing filter membrane collected above as a sample for analysis and measurement, and determine the measurement of the filter with and without the foaming agent. Film dust particle size is less than 7.1 The percentage of dust of μm is R1, R2. 4.5.4 Total dust reduction efficiency The total dust reduction efficiency is calculated according to formula (2). η = C1-C2 C1 × 100 (2) Where. η --- total dust reduction efficiency,%; C1 --- Dust concentration when dust is not removed with foaming agent, mg/m3; C2 --- Dust concentration when removing dust with foaming agent, mg/m3. 4.5.5 Residual dust reduction efficiency Respiratory dust reduction efficiency is calculated according to formula (3). ηH = C1R1-C2R2 C1R1 × 100 (3) Where. ηH --- Respiratory dust reduction efficiency,%; R1 --- The particle diameter of the filter membrane dust is less than 7.1 when the foam duster is not used for dust removal Mass percentage of dust in μm,%; R2 --- The particle size of the filter membrane dust is less than 7.1 when using a foam duster to remove dust The mass percentage of μm dust,%. ......

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