出口矾土检验方法铝矾土体积密度快速测定方法MethodsforinspectionofbauxiteforexportRapiddeterminationofbulkdensityofaluminaSN/T0481.6—95代替ZBQ25009—901主题内容与适用范围 本标准规定了出口铝矾土体积密度快速测定方法。本标准适用于铝矾土、焦宝石体积密度的测定。 测定范围2.17~3.32g/cm3。2方法提要 以自然试样的质量代替干燥试样的质量,用体积密度测定器(或用滴定管)测定其总体积,计算出体积密度,或直接查对自然试样体积密度对照表,得出体积密度值。3.定义4仪器设备4.1体积密度测定器(见图)4.2滴定管50或100mL4.3分析天平,感量0.001g4.4烧杯1.50mL4.5搪瓷盘200×180×25mm4.6棉毛巾200×500mm4.7绸子布200×500mm4.89号小毛刷4.9铝制小搓斗10×100×3012mm4.10分样筛孔径2mm和5.6mm各1只4.11电吹风450W5试样 直径10mm的15kg试样,应全部破碎过筛(小于5.6mm的样品可不经破碎,直接过筛,直至全部通过直径5.6mm筛孔,然后再过2mm筛,将小于2mm的颗粒弃去,制成2~5.6mm的颗粒,用四分法缩取约200~500g,供试验用。雨季的试样,在称样前用风干法(电吹风)除去试样表面的湿存水。6测定方法6.1仪器准备 在测定前应将体积密度测定器清洗干净。把盛样杯1注满清水,放在底座4上,打开溢水阀3,疏通虹吸管2,使水位归“0”,待虹吸管咀不滴水时关闭溢水阀3,将蓄水球5注满清水,打开调节阀8,把水位调至“0”位线6,关闭调节阀8,打开调节阀13,把水位调至“0”位线12,关闭调节阀13,(注意附管7中不得有气泡,若有气泡应吹气排除)待用。6.2试样称量 分别称取两个平行的自然试样,各50g,精确至0.001g,分别装入150mL烧杯中。6.3试样体积测定名符 号定 义单 位总体积VR 多孔体材料,开口气孔及闭口气孔的体积总和cm3体积密度QR 多孔体材料的质量与其总体积之比值g/cm36.3.1以清水冲洗试样2~3次,再注入清水至试样完全淹没,浸泡2min。6.3.2把用清水浸泡过的毛巾和绸子布,用手拧至手心不带水为止,平铺在搪瓷盘中、毛巾叠成四层铺在下面,绸子布叠成两层铺在毛巾上。6.3.3从烧杯中取出浸泡2min的试样,除去多余的水滴后,放在绸子布上,用小毛刷来回扫动,除去颗粒表面的附着水,直至颗粒表面光泽消失,但不能把气孔中水吸出,合拢绸子布,将试样移到小搓斗中。6.3.4把小搓斗中的试样注入准备好的盛样杯1中,从底座4上小心取下盛样杯1,套在刻度管上端连接处9,使虹吸管伸入蓄水球5中;打开溢水阀3,使盛样杯1中的水位自动归“0”,待虹吸管咀不滴水时,关闭溢水阀3,取下盛样杯1,弃去样品。6.3.5打开调节阀8,把蓄水球5中水位调至“0”位线6,记下刻度管10上的读数(精确至0.02mL),即为所测试样的总体积VR。7测定结果的计算7.1按下式计算体积密度的结果。 式中;m—自然试样量,g; VR—试样的总体积,cm3; B—换算至于样的系数,B=(1—0.2%)。7.2按自然试样体积密度对照表(见表A1)查得体积密度的结果。8允许误差.8.1同一试样的平行试验,不允许超过允许误差,超过允许误差必须重新试验。8.2同一试样的平行试验允许误差为0.04g/cm3。体积密度测定器操作示意图1-盛样杯,2-虹吸管;3-溢水阀;4,14-底座;5-蓄水球;6,12-“0”位线;7-附管;8,13-调节阀;9-连接处;10-刻度管;11-15mL定量球附录A自然试样体积密度对照表(补充件)表A1自然度样体积密度对照表 注:①VR—50克自然试样的总体积。 ②QR—校正后的体积密度。例:已测得A样的总体积VR为15.85mL,查自然试样体积密度对照表,与它相对应的QR为3.148,所以A样的体积密度QR=3.15g/cm3。续表A1VR=15.00mLVR=16.00mLVR=17.00mLVR=18.00mLVRQRVRQRVRQRVRQR15.0015.0515.1015.1515.203.3273.3163.3053.2943.28316.0016.0516.1016.1516.203.1193.1093.0993.0903.08017.0017.0517.1017.1517.202.9532.9272.9812.9102.90118.0018.0518.1018.1518.202.7722.7652.7572.7492.74215.2515.3015.3515.4015.453.2723.2613.2513.2403.23016.2516.3016.3516.4016.453.0713.0613.0523.0433.03317.2517.3017.3517.4017.452.8932.8842.8762.8682.86018.2518.3018.3518.4018.452.7342.7272.7192.7122.70515.5015.5515.6015.6515.703.2193.2093.1993.1883.17816.5016.5516.6016.6516.703.0243.0153.0062.9972.98817.5017.5517.6017.6517.702.8512.8432.8358.8272.81918.5018.5518.6018.6518.702.6972.6902.6832.6762.66815.7515.8015.8515.9015.953.1683.1583.1483.1383.12816.7516.8016.8516.9016.952.9792.9702.9612.9532.94417.7517.8017.8517.9017.952.8112.8032.7962.7882.78018.7518.8018.8518.9018.952.6612.6542.6472.6402.633VR=19.00mLVR=20.00mLVR=21.00mLVR=22.00mLVRQRVRQRVRQRVRQR19.0019.0519.102.6262.6192.61320.0020.0520.102.4952.4892.48321.0021.0521.102.3762.37l2.36522.0022.0522.102.2682.2632.258附加说明:本标准由中华人民共和国国家进出口商品检验局提出。本标准由中华人民共和国河南进出口商品检验局负责起草。本标准主要起草人姜远炎、王恩林。19.1519.2019.2519.3019.3519.4019.4519.5019.5519,6019.6519.7019.7519.8019.8519.9019.952.6062.5992.5922.5852.5792.5722.5662.5592.5522.5452.5392.5332.5272.5202.5142.5082.50l20.1520.2020.2520.3020.3520.4020.4520.5020.5520.6020.6520.?020.7520.8020.8520.9020.952.4762.4702.4642.4582.4522.4462.4402.4342.4282.4222,4162.4112.4052.3992.3932.3882.38221.1521.2021.2521.3021.3521.4021.4521.5021.5521.6021.6521.7021.7521.8021.8521.9021.952.3592.3542.3482.3432.3372.3322.3262.3212.3162.3102.3052.3002.2942.2892.2842.2792.27322.1522.2022.2522.3022.3522.4022.4522.5022.5522.6022.6522.7022.7522.8022.8522.9022.952.2532.2482.2432.2382.2332.2282.2232.2182.2132.2082.2032.1982.1932.1892.1842.1792.174