This standard is applicable to the determination of the true relative density of coke such as foundry coke and metallurgical coke. This standard is equivalent to ISO 1014-75 "Determination of true relative density, pseudo relative density and porosity of coke", with slight differences in technical content. GB/T 4511.4-1984 Method for determination of true relative density of coke GB/T4511.4-1984 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Method for determination of true relative density of coke
Coke-Determination of true relative density This standard is applicable to the determination of true relative density of coke such as foundry coke and metallurgical coke. UDC B62.618.18
: 531.755.1
GB4511.4—84
This standard is equivalent to IS01014-75 "Determination of true relative density, pseudo-relative density and porosity of coke", with slight differences in technical content.
Terms
True relative density is the ratio of the mass of a coke sample with a particle size of less than 0.2m to the same volume of water at a certain temperature. 2 Principle of the test
The sample is placed in a density bottle, and air-free distilled water is added. The water is heated to boil and the adsorbed gas is removed. According to Archimedes' theorem, the mass of the same volume of water can be measured to calculate the true relative density of the sample. 3 Sample collection and preparation
The sample collection and preparation shall be carried out in accordance with the provisions of GB1997-80 "Methods for the collection and preparation of metallurgical coke samples", and the analytical sample with a diameter less than 0.2mm shall be prepared.
1 Instruments
4.1 General laboratory instruments
4.2 Density bottle: Capacity 50ml.
4.3 Thermostat: A water bath with a stirrer and capable of maintaining 10~50°±1℃. 4.4 Air-cooled flow tube 1: A glass tube with an outer diameter of 300mm to 1000mm and the same length as the bottleneck of the density bottle, and a short section of rubber tube is used to tightly connect the two.
4.5 Glycerol bath: Fill a sufficient amount of glycerol in an appropriate container so that 2/3 of the density bottle can be immersed in the glycerol for heating. 5 Test steps
Wash the density bottle with a mixture of potassium dichromate and sulfuric acid, rinse it thoroughly with distilled water, fill it with air-free distilled water, tighten the cold seal and immerse the bottle in a water bath (to the neck) with a temperature about 5°C higher than the ambient temperature for 1 hour. After 1 hour, use a filter paper to absorb the water drops on the top of the stopper, take out the density bottle from the water bath, cool it quickly under tap water, dry it, place it on a large flat surface for 30 minutes and then weigh it (accurate to ± 0.1 mg). Turn the density bottle upside down and dry it under the bottle. wwW.bzxz.Net
Take a portion of the coke sample and dry it at 105~110 for 1 hour. After cooling to room temperature, weigh about 5g of ten coke (accurate to 0.1 mg) and put it all into the density bottle. Rinse the coke sample adhering to the neck and wall of the bottle with air-free distilled water to make the total volume reach 25ml. Connect the air cooling tube and the neck of the bottle with a rubber tube, put the density bottle in an oil bath, and heat the bath so that the water in the bottle begins to boil violently. Rinse the coke slag on the bottle wall with a few milliliters of hot distilled water without air. After boiling for 30 minutes, remove the density bottle from the glycerin bath, remove the air cooling tube, and let the bottle cool naturally. Instructions:
1150 The air cooling flow length used is 1000mm. National Bureau of Standards 1984-06-28 Issued
1985-06-01 Implementation
GB 45f1.*—84
Then inject t dead air-free distilled water, use a 1Ⅱ diameter cut wire to rotate and stir the bottleneck to make the coke slag sink, tighten the stopper, immerse it in a t℃ water bath to the bottleneck for 1 hour, and add air-free distilled water to compensate for the contraction of the liquid phase. Ensure that no air bubbles are accumulated under the stopper or in the capillary. After 1 hour, wipe off the water drops on the top of the stopper, take out the density bottle from the water palm, cool and dry, and weigh it next to the balance for 30 minutes. Note: tC is the test temperature, which is generally about 5℃ higher than the ambient temperature. 6 Calculation of test results
The relative density (d) of coke is calculated as follows: d =
Where: m——mass of coke sample on dry basis, g, m2—mass of density bottle when filled with water,
, +m2 - g
m3mass of density bottle, coke sample and water when filled with water, more. 7 Test error
7.1 The error between two parallel test results in the same laboratory shall not exceed 0.03. 7.2 The error between different laboratories shall not exceed 0.06. Additional remarks:
This standard was proposed by the Ministry of Metallurgical Industry of the People's Republic of China. This standard was drafted by Anshan Thermal Energy Research Institute of the Ministry of Metallurgical Industry. The main drafters of this standard are Ming Yue, Zhu Shangde and Zhu Mingsan.
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