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00:51:50</span> </div> </div> <div id="bnrjdjfh5" class="news-main-content"> <p><p> 比表面積是指單位質(zhì)量物料所具有的總面積。分外表面積、內(nèi)表面積兩類。國標單位㎡/g.理想的非孔性物料只具有外表面積，如硅酸鹽水泥、一些粘土礦物粉粒等；有孔和多孔物料具有外表面積和內(nèi)表面積，如石棉纖維、巖（礦）棉、硅藻土等。測定方法有容積吸附法、重量吸附法、流動吸附法、透氣法、氣體附著法等。比表面積是評價催化劑、吸附劑及其他多孔物質(zhì)如石棉、礦棉、硅藻土及粘土類礦物工業(yè)利用的重要指標之一。石棉比表面積的大小，對它的熱學性質(zhì)、吸附能力、化學穩(wěn)定性、開棉程度等均有明顯的影響。細度則是粉狀物質(zhì)被研細分散在連結(jié)料中的程度，以微米表示之。細度模數(shù)越大，表示砂越粗。普通混凝土用砂的細度模數(shù)范圍在3.7-1.6，以中砂為宜，或者用粗砂加少量的細砂，其比例為4:1。<br /> 比表面積和細度都是成比例關系的，細度越細比表面積就越大，但是比表面積分幾種比如BET SATA 等等類型，關鍵是一些材料表面或者內(nèi)部有微空的，可能總體細度增加一兩倍，比表面積增加很多，有時候顆粒大小分布的區(qū)域不同，會造成不同的結(jié)果，如用80微米方孔篩來進行測試：礦粉雖然細度小，但顆粒分布比較集中，如主要分布在 60微米左右。石粉細度大，但顆粒分布均勻的話，如：10~80微米的都有，那石粉的比表就比礦石的大。</p> <p> </p> <p> </p> <p> </p> </p> </div> <div id="bnrjdjfh5" class="pre-next"> <p><a href="/hydt/785.html">超細微粉磨粉機咨詢：比表面積的概述及測試方法</a></a></p> <p><a href="/hydt/787.html">白云石的塊、粉的加工設備</a><a href='/news/company/'>||返回列表</a></p> </div> </div> <div id="bnrjdjfh5" class="col-md-4 col-sm-4"> <div id="bnrjdjfh5" 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