HG/T 2252-1991 Method for sampling and preparation of celestite ore HG/T2252-1991 Standard download decompression password: www.bzxz.net

Chemical Industry Standard of the People's Republic of China
Celestine Ore
Sample Collection and Preparation Methods
Subject Content and Scope of Application
This standard specifies the sample collection and preparation methods for testing celestine ore products. This standard applies to celestine ore products. 2 Sampling and Sample Preparation Tools
2.1 Sampling Probe, Crusher, Grinding Machine, Reducer. 224.75mm and 150, 75um aperture standard sieve 3 Sample Particle Size
The particle size of commercial lump ore shall not exceed 350mm; the particle size of heavy flotation concentrate or powder ore shall not exceed 12mm. 4 Sampling quantity
HG2252
4.1 The amount of sample taken at each point of commodity lump ore shall not be less than 0.5kg, and the total amount of sample taken shall not be less than 0.05kg of its delivery batch. 91
4.2 The amount of sample taken at each point of heavy, flotation concentrate or powder ore shall not be less than 0.05kg, and the total amount of sample taken shall not be less than 0.05% of its delivery batch.
5 Sampling operation methodbzxZ.net
Ore supplied at the same level of more than 100t is a delivery batch. When sampling, use the sampling tool to take samples at a depth of 0.2m below the surface.
5.1 Ore pile sampling
On the inclined surface 0.3m away from the top and bottom of the ore pile, make a cross section every 0.8m slope distance, and arrange sampling points around each cross section with a distance of 0.8m between points. The amount of sample taken at each point and the total amount of sample must comply with the provisions of 4.1 or 4.2. 5.2 Sampling on Vehicles and Vessels
When transporting by car, train or ship, arrange the sampling points as shown below at a distance of not less than 0.3m from the vehicle wall or ship's surface (the number of sampling points can be increased or decreased according to the load), with a distance of 0.8Ⅱ between points. The amount of each sample and the total amount of the sample taken must comply with the provisions of Article 4.1 or 4.2,
The Ministry of Chemical Industry of the People's Republic of China approved the standard on November 15, 1991 and implemented on July 1, 1992
5.3 Sampling on Conveyor Belts
HG2252-91
According to the sampling amount and the belt transmission speed, samples are collected from the entire cross section of the conveyor belt using an automatic sampling device or sampling tool at certain intervals. The amount of each incremental sample and the total amount of the sample must comply with the provisions of 4.1 or 4.2. 5.4 Bag sampling
According to the sampling amount, a certain number of bags are separated during the loading and unloading process, and the incremental sample and the total amount of the sample are taken with a sampling probe in accordance with the provisions of 4.2.
5.5 When taking incremental samples, attention must be paid to the ore particle size and the proportion of different colors. Random selection is not allowed, and the amount of incremental samples taken should be approximately equal. If the sampling point falls on a lump of ore with too large a particle size, it needs to be crushed with a hammer and a sample representing the lump of ore is taken. 6 Sample preparation
Merge the original samples taken from the same batch, and go through four steps of crushing, sieving, mixing and shrinking. During the processing, the following formula can be used for step-by-step crushing and reduction: QKd?
Where: the minimum reliable amount of the sample to be reduced, kg; d the maximum particle size of the sample to be reduced, mm;
K--reduction coefficient, take 0.2.
If there is no reducer, it can be reduced manually. The reduction method adopts the quartering method. 61 blocks of ore
6.1.1 The original sample is crushed and reduced step by step until the particle size is no more than 150pm. Mix the spoon, reduce 100g, and then grind it finely, all through the 75m standard sieve, this sample is the final sample. Note: If the sample has a high moisture content and is inconvenient to prepare, the coal can be pre-dried at 105-110. 6.1.2 The final sample is fully mixed and divided into two clean, dry ground-mouth bottles in equal amounts, and labeled with the sample name, number, ore batch number, batch, production unit, sample quantity, sampling date and name of the sampler. One bottle is used as laboratory sample, and the other bottle is used as sample for examination: the sample for examination is kept for three months. 6.2 Heavy, flotation concentrate or powder ore
6.2.1 Combine the samples taken from the same batch, crush them to a particle size of no more than 4.75mm, mix them evenly, and take 2kg of them into two clean and dry ground-mouth bottles, and label them with the sample name, number, ore batch number, batch, production unit, sample quantity, sampling date and name of the sampler for determination of adsorbed water content. 6.2.2 Combine the sample for determination of adsorbed water content with the remaining samples, and prepare the laboratory sample and sample for examination according to 6.1.1 and 6.1.2.
Additional remarks:
This standard is proposed by the Science and Technology Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the Chemical Industry Mining Design Institute of the Ministry of Chemical Industry. This standard is drafted by the Chemical Industry Mining Design Institute of the Ministry of Chemical Industry, and the main drafters of this standard are Gu Lihua and Wang Heping. 4
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Chemical Industry Standards
Guanji Stone Mine Standards
HG2251~2252-91
Editor Chemical Industry Standards Reduction Department
(Standardization Research Institute of Ministry of Chemical Industry)
Postal Code: 100013
Printing Chemical Industry Standardization Research Institute
Copyright is exclusive and cannot be reproduced
Format 880×12301/16 Printing Sheet. Number of Words 7000 First Edition in February 1992
First Printing in February 1992
Printing 1500
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