ISO 20904:2020 硬煤 泥浆取样

标准编号：ISO 20904:2020

中文名称：硬煤 泥浆取样

英文名称：Hard coal — Sampling of slurries

发布日期：2020-02

标准范围

本文件规定了细粒煤、煤矸石或标称顶部尺寸的尾矿取样的基本方法<；4毫米，与水混合形成泥浆。当材料呈软塑性时，细固体与水的比例非常高，混合物被正确地称为糊状物。本文件不包括糊料取样。本文件中描述的程序主要适用于在移动流中作为泥浆运输的煤炭取样。这些水流可以自由下落，也可以被限制在管道、流槽、斜槽、螺旋槽或类似渠道中。不建议在静止状态下对泥浆进行取样，例如在槽、容器或坝中沉淀或甚至充分搅拌的泥浆，本文件也不涉及。本文件描述了旨在提供代表泥浆固体和受检泥浆粒度分布的样品的程序。排干流体的泥浆样品并测量流体体积后，泥浆中所含固体的潮湿样品可用于干燥（如果需要）并以无偏方式和已知精度测量一个或多个特性。通过化学分析或物理测试或两者来测量特性。所述取样方法适用于需要检查以验证是否符合产品规范、确定特征值作为贸易伙伴之间结算的基础或估计描述系统或程序的一组平均特征和方差的泥浆。如果流速不太高，与其他取样程序进行比较的参考方法是，在指定的时间或体积间隔内，将整个气流转移到容器中。该方法与ISO 13909-2中描述的停止传送带方法相对应。

This document sets out the basic methods for sampling fine coal, coal rejects or tailings of nominal top size <4 mm that is mixed with water to form a slurry. At very high ratios of fine solids to water when the material assumes a soft plastic form, the mixture is correctly termed a paste. Sampling of pastes is not covered in this document.The procedures described in this document primarily apply to sampling of coal that is transported in moving streams as a slurry. These streams can fall freely or be confined in pipes, launders, chutes, spirals or similar channels. Sampling of slurries in stationary situations, such as a settled or even a well-stirred slurry in a tank, holding vessel or dam, is not recommended and is not covered in this Document.This document describes procedures that are designed to provide samples representative of the slurry solids and particle size distribution of the slurry under examination. After draining the slurry sample of fluid and measuring the fluid volume, damp samples of the contained solids in the slurry are available for drying (if required) and measurement of one or more characteristics in an unbiased manner and with a known degree of precision. The characteristics are measured by chemical analysis or physical testing or both.The sampling methods described are applicable to slurries that require inspection to verify compliance with product specifications, determination of the value of a characteristic as a basis for settlement between trading partners or estimation of a set of average characteristics and variances that describes a system or procedure.Provided flow rates are not too high, the reference method against which other sampling procedures are compared is one where the entire stream is diverted into a vessel for a specified time or volume interval. This method corresponds to the stopped-belt method described in ISO 13909-2.

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