GB/T 18856.6-2008 English PDF
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GB/T 18856.6: Historical versions
| Standard ID | USD | BUY PDF | Delivery | Standard Title (Description) | Status |
| GB/T 18856.6-2008 | 150 | Add to Cart | Auto, 9 seconds. | Test methods for coal water mixture -- Part 6: Determination of the density | Valid |
| GB/T 18856.6-2002 | 279 | Add to Cart | 3 days | Test methods for quality of coal water mixture -- Part 6: Determination of calorific value of coal water mixture | Obsolete |
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GB/T 18856.6-2008: Test methods for coal water mixture -- Part 6: Determination of the density
---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/GBT18856.6-2008GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 75.160 D 21 Replacing GB/T 18856.9-2002 Test methods for coal water mixture - Part 6.Determination of density Issued on: JULY 29, 2008 Implemented on: APRIL 01, 2009 Issued by. General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3 1 Scope... 5 2 Normative references... 5 3 Method summary... 5 4 Reagents... 5 5 Instruments and equipment... 6 6 Test preparation... 6 7 Determination procedures... 7 8 Result calculation... 8 9 Method precision... 9 10 Test report... 9 Test methods for coal water mixture - Part 6.Determination of density1 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 Normative references
The clauses in the following documents, through reference in this Part of GB/T 18856, become clauses of this Part. For dated references, all subsequent amendments (not including errata content) or revisions do not apply to this Part. However, parties to agreements based on this Part are encouraged to study whether the latest versions of these documents can be used. For undated references, the latest edition applies to this Part. GB/T 6682, Water for analytical laboratory use - Specification and test methods3 Method summary
The density of coal water mixture can be obtained by measuring the mass and the volume (i.e., the volume of water discharged) of a certain amount of coal water mixture sample at 20 ℃ using the density bottle method.4 Reagents
4.1 Distilled water (CO2-free) The water used in this Part shall meet the requirements for grade-3 water specified in GB/T 6682.Freshly boiled and cooled to room temperature. 4.2 Washing solutions 4.2.1 Light gasoline or other solvents. capable of removing contaminants from density bottles and stoppers. 4.2.2 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/T 625) to the above solution that has been cooled to room temperature.5 Instruments and equipment
5.1 Density bottle. volume, 60 mL. As shown in Figure 1. 5.2 Mercury thermometer. 0 ℃ ~ 50 ℃; graduation, 0.2 ℃. 5.3 Analytical balance. sensitivity, 0.000 1 g. 5.4 Constant temperature water bath. capable of maintaining water temperature at (20±0.5) ℃.6 Test preparation
6.1 Preparation of density bottle First, remove contaminants from the density bottle and stopper. After using cleaning solution for thorough cleaning, use water to clean, and use distilled water to rinse; dry 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, use chromic acid washing solution. Chromic acid washing solution is a strong acid and a strong oxidizing agent, which shall be used with caution. 6.2 Determination of blank value for density bottle Fill the density bottle with freshly boiled and cooled-to-room-temperature distilled water along the inner wall of the bottle; then place it in a constant temperature water bath 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 constant temperature water bath 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.7 Determination procedures
7.1 Add the well-stirred coal water mixture sample to a pre-dried, clean, blank-tested, and weighed density bottle (accurate to 0.000 2 g) until it is half the volume of the density bottle; weigh it (accurate to 0.000 2 g) to obtain the mass m1 of the coal water mixture sample. 7.2 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 constant temperature water bath at (20±0.5) ℃ for 0.5 h. 7.3 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). 7.4 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. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
