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<div id="75557tv" class="pro_list"> <div id="vbf5ndb" class="pro_con"> <div id="jjzrhhh" class="pro_gs"> <div id="fdxbjvh" class="gs_tit"><h3>產(chǎn)品概述</h3></div> <div id="bz5vxj5" class="gs_text"> <p><strong>聚丙烯酰胺在洗煤廠的應(yīng)用價格</strong></p><p> 聚丙烯酰胺廣泛應(yīng)用于我國選煤廠浮選工藝，用來促進煤泥水沉降澄清，效果較好。但目前來看，其應(yīng)用方法存在若干值得注意的問題。</p><p> 目前生產(chǎn)制造聚丙烯酰胺的廠家較多，但質(zhì)量參差不齊。近，從市場和選煤廠收集到12種聚丙烯酰胺樣品，在相同條件下進行實驗室煤泥水絮凝沉降實驗，其中有代表性的數(shù)據(jù)列于表1.從中可以看出，不同樣品的澄清效果差距明顯，這與絮凝劑的質(zhì)量有很大關(guān)系。影響聚丙烯酰胺絮凝效果的主要因素是其分子量大小和水解度。</p><p> </p><p> 1分子量</p><p> 聚丙烯酰胺是線狀結(jié)構(gòu)的高分子絮凝劑，它依靠架橋作用將質(zhì)量小、不易沉降的小顆粒絮凝成團，絮團質(zhì)量遠大于單個顆粒，致使煤泥水中的顆粒的沉降速度成倍增加。</p><p> （1）聚丙烯酰胺一個鏈節(jié)的長度為2.5×10-4μm，當(dāng)其分子量為600萬時，長度達21μm。線性高分子的碳氫鏈越長，對有相當(dāng)距離的微粒越能形成架橋作用，因此，選煤廠所用聚丙烯酰胺的分子量hao在600-1000萬。尤其當(dāng)煤泥水濃度低時，更應(yīng)選擇高分子輛的聚丙烯酰胺。但如果分子量過大，其水溶性降低，形成的絮團可能過于蓬松，含水量大，影響后續(xù)的脫水回收作業(yè)。</p><p> （2）聚丙烯酰胺的溶解過程稱為“溶脹”。首先是水分子向高分子絮凝劑內(nèi)部擴散，使其膨脹，達到一定程度后，絮凝劑分子再向水中擴散，形成粘稠的水溶液。絮凝劑分子量越大，水溶液的粘度越大，擴散速度越慢，需要較長的時間才能充分溶解。</p><p> （3）聚丙烯酰胺的分子量是其質(zhì)量的一項重要指標(biāo)。按照GB17514-1998《水處理劑-聚丙烯酰胺》的標(biāo)準(zhǔn)，先用毛細管粘度計測定其水溶液的粘度，然后換算出分子量。在現(xiàn)場可通過觀察聚丙烯酰胺溶解過程來定型判別：對分子量大的產(chǎn)品，需較長時間攪拌才能溶解，水溶液粘稠，用手接觸提起后，時有“拉絲”現(xiàn)象；而一些偽劣產(chǎn)品，雖然從外觀上不易辨別，但因其分子量小，并摻入了可溶性的鹽類，所以溶解速度快且不發(fā)粘。</p><p> 2水解度</p><p> 非離子型聚丙烯酰胺（縮寫為PAM-N）的結(jié)構(gòu)式為：</p><p> 式中，n為高分子的鏈節(jié)數(shù)目，其值在幾萬至幾十萬之間。</p><p> 陰離子型聚丙烯酰胺（縮寫為PAM-A）的結(jié)構(gòu)式為：</p><p> 式中，n=x+y,水解度=y/n×100%。</p><p> 非離子型聚丙烯酰胺與堿反應(yīng)即可生成陰離子型聚丙烯酰胺，它是不*的水解體，在一個高聚合的分子中間同時帶有兩個不同的官能團，羧酸鈉（COONa）上的鈉離子溶于水中后，羧基（COO-）呈負(fù)電荷。</p><p><strong>聚丙烯酰胺在洗煤廠的應(yīng)用價格</strong><br /> 不同水解度的陰離子型聚丙烯酰胺，由于其分子鏈上羧基（COO-）數(shù)量不同，導(dǎo)致電荷排斥力不等，使得線性分子伸展程度不同，所示為水溶液中不同水解度聚丙烯酰胺分子鏈的伸展情況。水解度為零的非離子型聚丙烯酰胺的官能團（酰胺基）為—CONH2，同時它帶有少量的—CONH3+，使它成為弱陽離子型，分子鏈節(jié)中的正電荷有較弱的排斥力，使其有所伸展（見圖2a），因此具有一定的絮凝能力。水解度為10%左右的聚丙烯酰胺，其分子鏈中—COO-與—CONH3+正電荷相當(dāng)，相互吸引，使分子鏈卷曲收縮（見圖2b），導(dǎo)致絮凝能力大大降低。當(dāng)水解度達到33%左右時，溶液中—COO-負(fù)電排斥遠超過—CONH3+的吸引，使分子鏈達到相當(dāng)伸展程度（見圖2c），此時具有良好的絮凝能力。當(dāng)水解度繼續(xù)增大，羧基達到67%時，由于負(fù)電排斥使分子鏈基本*伸展（見圖2d），按理其效果應(yīng)該更好，但是由于線性分子帶負(fù)電過多，與煤泥水中帶負(fù)電的顆粒相互排斥，效果反而變壞。所以，洗煤廠應(yīng)使用陰離子型、水解度在33%左右的聚丙烯酰胺。水解度是聚丙烯酰胺的又一項重要質(zhì)量指標(biāo)，按照GB17514-1998用甲基橙-靛藍二磺酸鈉作為指示劑，用標(biāo)準(zhǔn)鹽酸滴定溶液進行測量。</p><p> 根據(jù)國家標(biāo)準(zhǔn)，測定聚丙烯酰胺分子量、水解度所需的器具都比較簡單，易于操作。有條件的生產(chǎn)單位，可以按此對購進的每批聚丙烯酰胺產(chǎn)品進行隨機質(zhì)量檢測，如果條件不符，應(yīng)幾十進行實驗室量筒絮凝沉降對比試驗。針對偽劣產(chǎn)品充斥市場的情況，各洗煤廠應(yīng)用所警惕，采取必要的防范措施。</p><p> </p> </div> </div> </div> <link rel="stylesheet" type="text/css" href="/css/MessageBoard_style.css"> <script language="javascript" src="/skins/Scripts/order.js?v=20210318" 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