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src="http://app98.img.mei-shu.net/s/wap.wordpressrevamp.com/static/modules/cms/images/time.png">發(fā)布時(shí)間：2021-07-13</p> </div> <div id="jmutbjj" class="w100 news_show_cl_c boxs"> <div id="z8a3uul" class="w100 news_show_cl_cc ques_cc"> <p>一、不溶物的問(wèn)題</p><p>國家標準對市售聚合氯化鋁的不溶物含量作了明確規定。因國內企業(yè)一般選用礦物作為原料，而礦物等原材料一般成分復雜，并需經(jīng)過(guò)破碎等加成粉末。且粉末越細，氧化鋁溶出率越高。但是相應不溶物等雜質(zhì)也就越難沉淀。因此如何有效降低不溶物是聚合氯化鋁生產(chǎn)急需解決的難點(diǎn)問(wèn)題。解決方案除合理DI1.T.礦物和選擇丁藝外，固液分離效果與不溶物含量有直接聯(lián)系，合理的分離方法選擇也是重要的環(huán)節之一，常用固液分離方法有：1、自然沉淀法。但通常需要時(shí)間長(cháng)，不適用占地面積小的廠(chǎng)家。2、板框壓濾機壓濾，但投資大，能耗高。3、投加聚丙烯酰胺等助凝劑，控制好投加量，通常會(huì )取得較好的效果。</p><p>二、產(chǎn)品純度問(wèn)題</p><p>氧化鋁含量是聚合氯化鋁產(chǎn)品的重要指標。通常認為其含量越高、純度越高，說(shuō)明品質(zhì)愈好，我國聚合氯化鋁行業(yè)中，除少數企業(yè)能生產(chǎn)部分系列產(chǎn)品及專(zhuān)用產(chǎn)品外。大多數企業(yè)都是以鋁土礦、鋁酸鈣和副產(chǎn)生產(chǎn)單一的低品質(zhì)聚合氯化鋁產(chǎn)品，生產(chǎn)規模小.技術(shù)含量低，產(chǎn)品有效成分氧化鋁含量低、雜質(zhì)多，而高效、廉價(jià)的復合型聚合鋁鹽和高純度聚合氯化鋁產(chǎn)品很少，滿(mǎn)足不了市場(chǎng)需求，特別是滿(mǎn)足不了造紙工業(yè)對高純度聚合氯化鋁產(chǎn)品的需要。這方面既是難點(diǎn)，也是研究熱點(diǎn)之一。因此，企業(yè)應該避免短期投資行為，應積極推廣新工藝技術(shù)，提高生產(chǎn)技術(shù)水平，同時(shí)需加大新產(chǎn)品開(kāi)發(fā)力度。</p><p><img src="/uploads/images/20210713/51.jpg" width="500" height="500" /></p><p>　　三、投加量問(wèn)題</p><p>制備聚合氯化鋁方法很多，但實(shí)現一定規模工業(yè)化生產(chǎn)的是酸溶法和堿溶法，其中由于生產(chǎn)成本、氧化鋁溶出率等問(wèn)題。酸溶法實(shí)際應用較堿溶法多，而酸溶涉及到濃度、投加量等問(wèn)題。濃度越高，氧化鋁溶出率越大，但揮發(fā)也就越厲害，故要合理配置濃度。質(zhì)量分數通常為20% 左右;投加量少，氧化鋁溶出率低.而投加量大時(shí).制備出的聚合氯化鋁鹽基度低、腐蝕性強。運輸困難，故需合理投加量。</p><p>四、鹽基度問(wèn)題</p><p>鹽基度越高通常產(chǎn)品的絮凝作用越好。一般可在低鹽基度產(chǎn)品中投加鋁屑、鋁酸鈉、碳酸鈣、碳酸鋁、氫氧化鈉凝膠、石灰等來(lái)提高鹽基度。若考慮到不引入重金屬和其它雜質(zhì)。一般采用加鋁屑和鋁酸鈉的方法。但成本要高于鋁酸鈣和鋁灰，目前國內較多企業(yè)采用鋁酸鈣調整鹽基度。</p><p>五、重金屬等有害離子的去除問(wèn)題</p><p>某些原料中重金屬等有害離子含量很高?？梢栽谒崛苓^(guò)程中加入硫化鈉、硫化鈣等硫化物.使有害離子生成硫化物沉淀而去除;也可以考慮用鋁屑置換和活性炭吸附的方法去除重金屬等有害離子。</p> </div> <div id="jkdd5az" class="w100 news_show_cl_cdw boxs"> 長(cháng)乘科技聚丙烯酰胺規格齊全，幾十種余種規格聚丙烯酰胺產(chǎn)品滿(mǎn)足各行所需，滿(mǎn)足您的一切需求。您還可以了解全部長(cháng)乘科技新聞或查看相關(guān)的聚丙烯酰胺化工產(chǎn)品和化工產(chǎn)品應用案例、化工產(chǎn)品百科、化工產(chǎn)品常見(jiàn)問(wèn)題。 </div> </div> <div id="bv4ihlc" class="w100 news_show_cl_page"> <span id="b7u4gxn" class="news_show_cl_page_left left trion boxs">< 上一篇：<a href='/dynamic/192.html'>PAC使用方案介紹</a> </span> <span id="sedcltk" class="news_show_cl_page_right right trion boxs">< 下一篇：<a href='/dynamic/194.html'>聚合氯化鋁與聚丙烯酰胺有哪些區別</a> </span> </div> </div> <div id="98df7oo" class="right news_show_cr"> <div id="2qpyppg" 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