煤中碳酸盐二氧化碳测定系统准确性试验研究  

Experimental study on the testing systematic accuracy of carbon dioxide of the carbonate in coal

作　　者：王秋湘[1,2,3] 

机构地区：[1]国家煤炭质量监督检验中心,北京100013 [2]煤炭科学技术研究院有限公司检测分院,北京100013 [3]煤炭资源高效开采与洁净利用国家重点实验室,北京100013

出　　处：《煤质技术》2014年第6期27-31,63,共6页Coal Quality Technology

基　　金：煤炭科学研究总院检测基金课题(2009JC02)

摘　　要：基于目前ISO、ASTM、GB规定的煤中碳酸盐二氧化碳测定所用试验装置均为负压供空气方式,对GB/T 218—1996《煤中碳酸盐二氧化碳含量的测定方法》规定的试验装置进行改进,即增加正压供空气及正压供氮气2种供气方式。在负压供空气、正压供空气及正压供氮气3种供气条件下进行不同质量的优级纯无水碳酸钠的回收率试验,以研究分析煤中碳酸盐二氧化碳含量测定装置系统准确性测试的具体指标要求及方法。研究结果表明,当所用测定系统为第一次使用或测定系统有变化以及更换试剂时,应准确称取0.2g^0.4g经干燥过的优级纯无水碳酸钠进行系统准确性测试,如果无水碳酸钠分解产生的二氧化碳实验测定值与理论值相差不超过理论值的1﹪时,即可认为测定系统的准确性符合要求。The negative pressure air （hydraulic pump suction） method was specified in the ISO, ASTM and GB standards of determination of the carbonates carbon dioxide in coal. On the basis of present method, The test apparatus which is specified in GB/T 218--1996 ＇Determination of Carbon Dioxide of Carbonate in Coal＇ was improved, and two gas supply modes which are the positive pressure air and positive pressure nitrogen were added. Under three gases supply conditions of negative pressure airsupply, positive pressure air-supply and positive pressure nitrogen-supply, the carbon dioxide recovery rate of the different mass anhydrous sodium carbonate （guaranteed reagent） was measured, which could study the specification and method of the system accuracy of Carbon Dioxide of Carbonate in Coal. The result showed： the check tests should be carried out after initially setting up the apparatus and having made any change to it or to the reagents before making a determination or series of determinations; and 0. 2 g--0. 4g of the dried GR anhydrous sodium carbonate （to nearest 0. 000 2 g） should be weighed to determine the carbon dioxide expected to be liberated from the check test portion, to compare it with the theoretical value. The test result would be regarded to meet the requirement of the accuracy of measurement when the measured val.ue was within 1% of the theoretical value.

关 键 词：煤中碳酸盐 二氧化碳 测定系统 准确性 负压 正压 

分 类 号：TQ533[化学工程—煤化学工程]