GB/T 18856.9-2002 English PDF
Price & Delivery
US$190.00 · In stock · Download in 9 secondsGB/T 18856.9-2002: Test methods for quality of coal water mixture -- Part 9: Determination of the density of coal water mixture
Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure
Status: Obsolete
| Standard ID | USD | BUY PDF | Delivery | Standard Title (Description) | Status |
| GB/T 18856.9-2002 | 190 | Add to Cart | Auto, 9 seconds. | Test methods for quality of coal water mixture -- Part 9: Determination of the density of coal water mixture | Obsolete |
Click to Preview this PDF
Similar standards
GB/T 18856.9-2002: Test methods for quality of coal water mixture -- Part 9: Determination of the density of coal water mixture
---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/GBT18856.9-2002
GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 75.160 D 21 Test methods for quality of coal water mixture - Part 9. Determination of the density of coal water mixture Replaced Issued on: OCTOBER 18, 2002 Implemented on: APRIL 01, 2003 Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
Table of Contents
Foreword... 3 1 Scope... 4 2 Method summary... 4 3 Reagents... 4 4 Instruments and equipment... 4 5 Test preparation... 5 6 Determination procedures... 6 7 Result calculation... 6 8 Method precision... 8 Test methods for quality of coal water mixture - Part 9. Determination of the density of coal water mixture1 Scope
This Part of GB/T 18856 specifies the method summary, reagents, instruments and equipment, determination procedures, result calculation, and precision for the determination of the density of coal water mixture. This Part applies to various types of coal water mixture.2 Method summary
The density of coal water mixture can be obtained by measuring the ratio of the mass of a certain amount of coal water mixture sample to its volume (i.e., the volume of water discharged) at 20 ℃ using the density bottle method.3 Reagents
3.1 Washing solutions 3.1.1 Light gasoline or other solvents. capable of removing contaminants from density bottles and stoppers. 3.1.2 Chromic acid washing solution. Weigh 20 g of potassium dichromate (GB 642) into a 500 mL beaker; add 40 mL of water; heat to dissolve the potassium dichromate; cool to room temperature. While stirring continuously, slowly add 360 mL of concentrated sulfuric acid (GB 625) to the above solution that has been cooled to room temperature. 3.2 Distilled water (CO2-free). freshly boiled distilled water, cooled to room temperature.4 Instruments and equipment
4.1 Density bottle, with ground glass capillary stopper; volume, 60 mL. As shown in Figure 1. 4.2 Mercury thermometer. 0 ℃ ~ 50 ℃; graduation, 0.2 ℃. 4.3 Analytical balance. sensitivity, 0.000 2 g. 4.4 Thermostat. a thermostat capable of maintaining a constant temperature of (20±0.5) ℃. 4.5 Water bath.5 Test preparation
5.1 Preparation of density bottle First, remove contaminants from the density bottle (4.1) and stopper. After using the cleaning solution (3.1) for thorough cleaning, use water to clean and then use distilled water to rinse. Place the cleaned density bottle in an oven to dry and cool to room temperature for later use. Note. First, use light gasoline or other solvents to remove contaminants from the density bottle and stopper. If the contaminants cannot be removed, then use chromic acid washing solution. Chromic acid washing solution is a strong acid and a strong oxidizing agent, which shall be used with caution. 5.2 Determination of blank value for density bottle Fill the density bottle with freshly boiled and cooled-to-room-temperature distilled water (3.2) along the inner wall of the bottle; then place it in the thermostat (4.4) at (20±0.5) ℃ for 1 h. Put the cap back on and let the excess water overflow from the capillary tube (there shall be no air bubbles in the bottle or the capillary tube at this time; otherwise, add water and put the cap back on). Quickly dry the density bottle; weigh it immediately (accurate to 0.000 2 g). Then place the density bottle in a thermostat at (20±0.5) ℃ and keep it at that temperature for 0.5 h until the difference in mass between the two measurements is less than 0.001 5 g. Take the arithmetic mean of the two measurements as the blank value (m0) for the density bottle. The blank value of the density bottle shall be measured once a month.6 Determination procedures
6.1 Weigh the dry, clean, and blank-measured density bottle (accurate to 0.000 2 g) to obtain the mass (mb) of the density bottle. 6.2 Add the well-stirred coal water mixture sample of approximately half the volume of density bottle to the density bottle; weigh it (accurate to 0.000 2 g), to obtain the mass of the density bottle containing the sample (mb+s). Then, the mass of coal water mixture sample (m1) is. m1= mb+s - mb. 6.3 Pour freshly boiled and cooled-to-room-temperature distilled water into the density bottle along the inner wall until it is about 1 cm below the bottle opening; then place it in a thermostat at (20±0.5) ℃ for 0.5 h. 6.4 Use a pipette to add boiled 20 °C or room temperature distilled water along the neck of the bottle to the opening; then put the cap on the bottle and let the excess water overflow from the capillary tube on the stopper (at this time, there shall be no air bubbles in the bottle or the capillary tube, otherwise water shall be added and the stopper shall be put back on). 6.5 Quickly dry the density bottle and weigh it immediately (accurate to 0.000 2 g) to obtain the mass (m2) of the density bottle containing the sample and water.7 Result calculation
The measurement result of the density of coal water mixture shall be calculated according to the following formula. Where. ρ20 – density of coal water mixture at 20 ℃, in grams per cubic centimeter (g/cm3); ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
