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This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed by the China National Coal Association.
This Standard is under the jurisdiction of the National Technical Committee on Coal Standardization Administration of China (SAC/TC 42).
General Rules for Testing Methods of Coal Preparation
1 Scope
This standard specifies the relevant terms and definitions, symbols, test coal samples, dense preparation, expression of results, test records and test reports for the testing methods of coal preparation.
This standard is applicable to various standards, specifications, reports, books, textbooks and manuals concerning the testing methods of coal preparation.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 474 Method for Preparation of Coal Sample
GB/T 475 Method for Manual Sampling of Commercial Coal
GB/T 483 General Rules for Analytical and Testing Methods of Coal
GB/T 3715-2007 Terms Relating to Properties and Analysis of Coal
GB/T 7186-2008 Terms Relating to Coal Preparation
GB/T 8170 Rules of Rounding Off for Numerical Values & Expression and Judgment of Limiting Values
GB/T 19494.1 Mechanical Sampling of Coal—Part 1:Method for Sampling
GB/T 19494.2 Mechanical Sampling of Coal—Part 2:Method for Sample Preparation
3 Terms and Definitions
For the purpose of this standard, the terms and definitions specified in GB/T 3715-2007 and GB/T 7186-2008 as well as the following ones apply. For the convenience of application, some terms and definitions in GB/T 3715-2007 and GB/T 7186-2008 are listed again.
3.1
coal sample
representative portion of coal taken from coal to determine certain characteristics
[GB/T 3715-2007, Definition 3.1.1]
3.2
sampling
process that a representative portion of coal is taken from a large amount of coal
[GB/T 3715-2007, Definition 3.1.2]
3.3
increment
portion of sample taken by the sampler operating once or cutting a full cross-section of the coal flow
[GB/T 3715-2007, Definition 3.1.10]
3.4
gross sample
coal sample of all increments taken from one sampling unit
[GB/T 3715-2007, Definition 3.1.11]
3.5
coal sample for production
under normal production conditions, coal sample taken during a full-scale coal mining process that represents the physical, chemical, and process characteristics of the coal produced
[GB/T 3715-2007, Definition 3.1.17]
3.6
bulk density
mass of bulk coal per unit volume under specified conditions
[GB/T 3715-2007, Definition 3.2.26]
3.7
size analysis
test that the coal sample was divided into groups of different particle sizes using sieves of different pore sizes and then subjected to the measurement of the particle size characteristics
[GB/T 7186-2008, Definition 4.1.3]
3.8
dense
liquid or solution with a density greater than that of water for use in coal float-and-sink tests. Dense is divided into organic dense, zinc chloride dense and inorganic high-density dense.
[GB/T 7186-2008, Definition 5.4.1]
3.9
float-and-sink analysis; float-and-sink test
coal samples are separated into different density levels by the dense of different densities.
[GB/T 7186-2008, Definition 3.2.2]
3.10
test coal’s degradation in water
test that coal or its associated minerals were added with water in the rotary bucket for overturn of different duration, for the purpose of measuring recrushing degree, including the coal’s degradation test in water in rotary bucket and degradation degree measurement for associated minerals of coal.
3.11
the ratio of degradation in water
ratio of the mass of fine slime less than 10 μm to the total mass of the 0.5 mm undersize, in the degradation measurement results
3.12
flotation test
test to determine the floatability and flotation process conditions of pulverized coal (slime).
3.13
batch-flotation test
flotation test carried out using a single tank flotation machine
[GB/T 7186-2008, Definition 5.6.40]
3.14
timed-release analysis
batch-flotation test using one roughing and multiple cleaning
[GB/T 7186-2008, Definition 5.6.41]
3.15
natural falling test
discrete falling test on a slime water sample without any flocculant or coagulant
3.16
flocculant performance test
test that flocculant of different mass is added to the slime water to measure the free falling speed and the initial falling speed of the flocs to reflect the flocculant falling performance
3.17
determination of content of magnetic material
operation process of measuring the content of magnetic material in the magnetite powder for coal preparation by a magnetic material analyzer
3.18
slime pressure filtration test
pressure filtration test carried out with a pressure filter in order to determine the process parameters affecting the slime pressure filtration effect and to study the slime pressure filtration characteristics
3.19
determination of filter aiding effect of flocculants
operation process of measuring the filter aiding effect of flocculants by a laboratory-use vacuum filtration system
3.20
determination of angle
operation process of measuring the angle of repose of coal sample of certain particle size
3.21
determination of percentage of refuse content
operation process of measuring the refuse content of coal samples
3.22
determination of undersize fraction
operation process of measuring the undersize fraction of coal samples
3.23
error
difference between the observed value and the acceptable reference value
3.24
accuracy
degree of closeness between the observed value and the true value or the agreed true value
3.25
precision
degree of compliance between the independent test results obtained under specified conditions
3.26
tolerance
maximum allowable difference between two or more observed values obtained under specified conditions
3.27
repeatability
certain value. critical value of the difference (at 95% probability) between the results obtained during the repeated measurements carried out in the short term under repeated conditions, i.e. by the same operator, with the same instrument, on the same sample, in the same laboratory
4 Coal Samples
4.1 Sampling and preparation
In accordance with GB/T 474, GB/T 475, GB/T 19494.1 and GB/T 19494.2.
4.2 Storage of coal samples
The moisture samples shall be placed in a closed container. After the test samples are air-dried, they are sealed and stored in a water-proof sample bag.
4.3 Sampling for analysis test
The coal sample shall be thoroughly mixed before sampling and sampled from several points.
5 Preparation of Dense
5.1 Commonly-used dense
The dense commonly used in the experiment is inorganic dense and organic dense. The inorganic dense is high-density dense and zinc chloride solution, while the organic dense is prepared with carbon tetrachloride and benzene or with carbon tetrachloride and bromoform.
5.2 Preparation of dense
The inorganic high-density dense is prepared by a dilution method, and the diluted dense can be concentrated by evaporation to increase the density. Zinc chloride and organic dense can be prepared with reference to Table 1.
Foreword i 1 Scope 2 Normative References 3 Terms and Definitions 4 Coal Samples 5 Preparation of Dense 6 Expression of Results 7 Test Records and Test Reports
ICS 73.040 D 27 中华人民共和国国家标准 GB/T 33689-2017 选煤试验方法一般规定 General rules testing methods of coal preparation 2017-05-12 发布 2017-12-01 实施 中华人民共和国国家质量监督检验检疫总局 发布 中国国家标准化管理委员会 前言 本标准按照GB/T 1.1-2009给出的规则起草。 本标准由中国煤炭工业协会提出。 本标准由全国煤炭标准化技术委员会（SAC/TC 42）归口。 本标准起草单位：中煤科工集团唐山研究院有限公司、西安鼎力燃料检测有限公司、天地（唐山）矿业科技有限公司。 本标准主要起草人：曹学章、周晓梅、越志颖、杨茂青。 选煤试验方法一般规定 1 范围 本标准规定了选煤试验方法的有关术语及其定义、符号、试验煤样、重液配制、结果表达、试验记录和试验报告。 本标准适用于各种选煤试验方法标准、规范、报告、书刊、教材和手册。 2 规范性引用文件 下列文件对于本文件的应用是必不可少的。凡是注日期的引用文件，仅注日期的版本适用于本文件。凡是不注日期的引用文件，其最新版本（包括所有的修改单）适用于本文件。 GB/T 474 煤样的制备方法 GB/T 475 商品煤样人工采取方法 GB/T 483 煤炭分析试验方法一般规定 GB/T 3715-2007 煤质及煤分析有关术语 GB/T 7186-2008 选煤术语 GB/T 8170 数值修约规则与极限数值的表示和判定 GB/T 19494.1 煤炭机械化采样 第1部分：采样方法 GB/T 19494.2 煤炭机械化采样 第2部分：煤样的制备 3 术语和定义 GB/T 3715-2007和GB/T 7186-2008界定的以及下列术语和定义适用于本文件。为了便于使用，以下重复列出了GB/T 3715-2007和GB/T 7186-2008中的某些术语和定义。 3.1 煤样 coal sample 为确定某些特性而从煤中采取的有代表性的一部分煤。 [GB/T 3715-2007，定义3.1.1] 3.2 采样 sampling 从大量煤中采取具有代表性的一部分煤的过程。 [GB/T 3715-2007，定义3.1.2] 3.3 子样 increment 采样器具操作一次或截取一次煤流全横截段所采取的一份样。 [GB/T 3715-2007，定义3.1.10] 3.4 总样 gross sample 从一个采样单元取出的全部子样合并成的煤样。 [GB/T 3715-2007，定义3.1.11] 3.5 生产煤样 coal sample for production 在正常生产情况下，在一个整班的采煤过程中采出的，能代表生产煤的物理、化学和工艺特性的煤样。 [GB/T 3715-2007，定义3.1.17] 3.6 堆密度 bulk density 在规定条件下，单位体积散装煤的质量。 [GB/T 3715-2007，定义3.2.26] 3.7 筛分试验 size analysis 将煤样用不同孔径的筛子分成不同粒级并测定粒级特性的试验。 [GB/T 7186-2008，定义4.1.3] 3.8 重液 dense 密度大于水的液体或溶液，用于煤炭浮沉试验。分为有机重液、氯化锌重液和无机高密度重液。 [GB/T 7186-2008，定义5.4.1] 3.9 浮沉试验 float-and-sink analysis；float-and-sink test 将煤样用不同密度的重液分成不同的密度级。 [GB/T 7186-2008，定义3.2.2] 3.10 泥化试验 test coal’s degradation in water 将煤或其伴生矿物在翻转桶内加水进行不同时间的翻转，以测定其再粉碎程序的试验，包括煤的转筒泥化试验和煤伴生物矿物泥化程度测定。 3.11 泥化比 the ratio of degradation in water 泥化测定结果中，小于10μm细泥质量与0.5mm筛下物总质量的比值。 3.12 浮选试验 flotation test 为确定煤粉（泥）的可浮性及浮选工艺条件而进行的试验。 3.13 单元浮选试验 batch-flotation test 用单槽浮选机进行的浮选试验 [GB/T 7186-2008，定义5.6.40] 3.14 分步释放浮选试验 timed-release analysis 采用一次粗选多次精选流程的单元浮选试验。 [GB/T 7186-2008，定义5.6.41] 3.15 自然沉降试验 natural falling test 对不含任何絮凝剂或凝聚剂等的煤泥水试样进行的离散沉降试验。 3.16 絮凝剂性能试验 flocculant performance test 向煤泥水中加入不同质量的絮凝剂，分别测定絮团的自由沉降速度和初始沉降速度，以反映絮凝剂沉降性能的试验。 3.17 磁性物含量测定 determination of content of magnetic material 以磁性物含量测定仪对选煤用磁铁矿粉中磁性物含量进行测定的操作过程。 3.18 煤泥压滤性试验 slime pressure filtration test 为确定影响煤泥压滤效果的工艺参数、研究煤泥的压滤特性，用压滤机进行的压滤试验。 3.19 絮凝剂助滤效果测定 determination of filter aiding effect of flocculants 用实验室真空过滤系统对絮凝剂助滤效果进行测定的操作过程。 3.20 安息角测定 determination of angle 对某一粒级煤样的安息角进行测定的操作过程。 3.21 含矸率的测定 determination of percentage of refuse content 对煤样含矸率进行测定的操作过程。 3.22 限下率的测定 determination of undersize fraction 对煤样限下率进行测定的操作过程。 3.23 误差 error 观测值和可接受的参比值间的差值。 3.24 准确度 accuracy 观测值与真值或约定真值间的接近程度。 3.25 精密度 precision 在规定条件下所得独立试验结果间的符合程度。 3.26 允许差 tolerance 在规定条件下获得的两个或多个观测值间允许的最大差值。 3.27 重复性限 repeatability 一个数值。在重复条件下，即在同一实验室中、由同一操作者、用同一仪器、对同一试样，于短期内所做的重复测定，所得结果间的差值（在95%概率下）的临界值。 4 煤样 4.1 煤样的采取和制备 按GB/T 474、GB/T 475、GB/T 19494.1和GB/T 19494.2执行。 4.2 煤样的保存 水分试样应装入密闭容器，一般试验用试样晾至空气干燥状态后，密封保存于具防水功能的样品袋中。 4.3 分析试验取样 取样前应将煤样充分混匀，取样时采用多点取样法。
