This standard specifies the determination of ignition loss by gravimetric method. This standard is applicable to the determination of ignition loss in limestone and dolomite, and also to the determination of ignition loss in metallurgical lime. GB/T 3286.8-1998 Limestone and dolomite chemical analysis method Determination of ignition loss GB/T3286.8-1998 Standard download decompression password: www.bzxz.net

GB/T3286.8—1998
This standard amends GB/T3286.10--1988 "Chemical analysis method for limestone and dolomite - determination of ignition loss". This standard adopts the determination method of ignition loss in JISM8850:1994 "Chemical analysis method for limestone" in a non-equivalent manner. This revision of the standard clarifies in the "scope" that it is also applicable to the determination of ignition loss in metallurgical lime. The "allowable difference" adds the laboratory allowable difference.
GB/T3286 "Chemical analysis methods for limestone and dolomite" includes the following nine substandards: GB/T 3286. 1
GB/T 3286.2
GB/T 3286. 3
GB/T 3286.4
GB/T 3286.5Www.bzxZ.net
Determination of calcium oxide content and magnesium oxide content;
Determination of silicon dioxide content;
Determination of aluminum oxide content;
Determination of iron oxide content,
Determination of manganese oxide content;
Determination of phosphorus content;
GB/T 3286. 6
GB/T 3286. 7
GB/T 3286.8
GB/T 3286.9
Determination of sulfur content;
Determination of loss on ignition;
Determination of carbon dioxide content.
This standard replaces GB/T3286.10-1988 from the date of implementation. This standard was proposed by the former Ministry of Metallurgical Industry of the People's Republic of China. This standard is under the jurisdiction of the Information Standards Research Institute of the former Ministry of Metallurgical Industry. This standard was drafted by Wuhan Iron and Steel (Group) Corporation. Drafting unit of this standard: Wuhan Iron and Steel (Group) Corporation Technology Center. Main drafters of this standard: Cao Hongyan, Liu Hongyun, Liu Jixian, Chen Zibin This standard was first issued in July 1982 and revised for the first time in September 1988. 79
1 Scope
National Standard of the People's Republic of China
Methods for chemical analysis oflimestone and dolomite-
The determination of loss on ignition
Methods for chemical analysis oflimestone and dolomite-
The determination of loss on ignitionThis standard specifies the determination of loss on ignition by the gravimetric method. GB/T3286.8—1998
Replaces GB/T3286.10—1988
This standard applies to the determination of loss on ignition in limestone and dolomite, and also to the determination of loss on ignition in metallurgical lime. 2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard was published, the versions shown were valid. All standards are subject to revision, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T2007.2--1987 General rules for sampling and sample preparation of bulk mineral products Manual sample preparation method 3 Method summary
The sample is placed in a platinum crucible, gradually heated to 1050℃±50℃ in a high-temperature furnace, and burned to constant weight. The reduced mass is the ignition loss.
4 Instruments
In the analysis, only common laboratory instruments and equipment are used. 5 Sample preparation
Prepare the sample according to GB/T2007.2.
5.1 The sample should be processed to a particle size of less than 0.125mm. 5.2 Before the analysis of limestone and dolomite samples, dry them at 105-110℃ for 2h and cool them in a desiccator to room temperature. 5.3 The preparation of metallurgical lime samples should be carried out quickly. After preparation, the sample is immediately placed in a ground-mouth bottle or plastic bag and sealed, and stored in a desiccator. The sample is not dried before analysis.
6 Analysis steps
6.1 Sample quantity
Weigh 1.00g of sample, accurate to 0.0001g. For the sample of gold and lime, the sample should be weighed quickly. 6.2 Determination
6.2.1 Spread the sample (6.1) in a platinum crucible (including platinum cover) that has been calcined at 1.050℃ and weighed. Approved by the State Administration of Quality and Technical Supervision on December 7, 199880
Implementation on July 1, 1999
GB/T3286.8—1998
6.2.2 Place platinum in a high-temperature furnace with a furnace temperature below 300℃, cover it with a platinum cover, and leave a gap between the platinum crucible and the platinum cover. Gradually heat the high-temperature furnace. When the temperature reaches 800-900℃, open the furnace door 2-3 times, each time for about 1 minute. Continue to raise the temperature to 1050℃±50℃ and burn at this temperature for 60min.
6.2.3 Take out the platinum crucible, cover it with a platinum lid, and cool it slightly. Place the platinum crucible and platinum lid in a desiccator, cool it to room temperature, and weigh it quickly. Note: The main components of the burned material are calcium oxide and magnesium oxide, which easily absorb moisture and carbon dioxide in the air. When weighing, you can preset the magnetic code on the balance pan, then place the platinum crucible on the balance pan, cover it with a platinum lid, and weigh it quickly. 6.2.4 Place the platinum crucible and platinum lid in the high-temperature furnace again and burn at 1050℃±50℃ for 15min. Follow 6.2.3 until the difference between the two weighings does not exceed 1.0mg. If the mass measured after repeated burning increases, the analysis result is calculated based on the mass measured last time before the increase.
Expression of analysis results
Calculate the mass percentage of ignition loss by the following formula: ignition loss (%) = m = m2×100
-mass of the sample, platinum crucible and platinum cover before ignition, g, where: m
m2—---mass of the sample, platinum and platinum cover after ignition, g;—sample amount·g.
8 Allowable difference
The difference between two independent analysis results in the laboratory and the difference between the analysis results of two laboratories should not be greater than the corresponding allowable difference listed in Table 1. For metallurgical lime samples, no allowable difference requirements are made between laboratories. Table 1
Loss on ignition
Limestone, dolomite
Metallurgical lime
Allowable difference within the laboratory
Allowable difference between laboratories
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