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<div id="os0kqiw" class="content"> <p> <table width="100%" border="0" cellspacing="0" cellpadding="0"> <tr> <td align="left" valign="top"><table width="100%" border="0" align="center" cellpadding="0" cellspacing="0"> <tr> <td height="43" align="center" valign="top"><span style="font-size:16px; color: #666666;"><b>廢酸資源回收治理</b></span></td> </tr> </table> <table width="100%" border="0" align="center" cellpadding="0" cellspacing="0"> <tr> <td height="40" style="border-bottom: 1px dashed #d9d9d9;"><font color="#999999">作者:西安金沃泰環(huán)??萍加邢薰?/font> <font color="#999999">發(fā)稿日期:2021-03-03 11:34:50</font></td> </tr> <tr> <td align="left" class="neirong" style="padding-top: 30px;">  在鋼鐵、冶金和電鍍等工業(yè)中,金屬的表面處理是必不可少的。如在鋼鐵工業(yè)中,鋼材放置時(shí)間過(guò)長(cháng)其表面會(huì )有鐵銹和氧化鐵皮生成,為了對鋼材進(jìn)行諸如冷軋、表面鍍層以及表面涂層等下一步加工,需要把表面的氧化鐵皮和鐵銹除掉,氧化鐵皮和鐵銹的主要成分包括四氧化三鐵、氧化鐵和氧化亞鐵。去除氧化鐵皮和鐵銹的方法主要包括機械處理法、中性電解去鱗法以及酸洗處理法等,由于鐵的氧化物容易和酸發(fā)生反應,因此酸洗處理法是最常用的處理方法。酸洗過(guò)程中,酸與鐵的氧化物以及基體鐵反應逐漸被消耗,同時(shí)酸中的亞鐵和鐵離子的濃度逐漸增高,當酸洗液中的亞鐵和鐵離子濃度達到一定值后,酸洗效率會(huì )變得很差,酸洗液就不能再使用,從而變成酸洗廢液。酸洗廢液不僅來(lái)源于鋼鐵行業(yè),在金屬制品加工、電鍍、冶金等工業(yè)生產(chǎn)過(guò)程中,都會(huì )用到酸洗這道工序,因此這些行業(yè)每年都會(huì )產(chǎn)生大量的酸洗廢液。目前常用的酸洗劑主要有鹽酸、硫酸、硝酸和氫氟酸,根據酸洗的對象、酸洗液的種類(lèi)以及對產(chǎn)品的需求不同,酸洗廢液的成分、酸度以及金屬離子濃度也會(huì )有差異,酸洗廢液中主要含有 H+、Cl-、SO42-、Fe2+、Fe3+、Cu2+、Ni2+、Zn2+等離子。隨著(zhù)經(jīng)濟的發(fā)展和人們對物質(zhì)的要求越來(lái)越高,因而對金屬和金屬加工制品的需求也在不斷增加,從而帶動(dòng)了鋼鐵、電鍍和金屬加工等工業(yè)的發(fā)展,因此每天產(chǎn)生的酸洗廢液仍在不斷增多。<br />   酸洗廢液的特點(diǎn)是廢液量大,酸和金屬離子濃度高,直接排放會(huì )造成很大的危害。首先當酸洗廢液排入下水道后,由于廢液具有強的酸腐蝕性會(huì )破壞管道結構;其次當酸洗廢液進(jìn)入到水體后,廢液中的重金屬離子會(huì )污染水源,同時(shí)殘酸會(huì )和水體中的碳酸鈣發(fā)生反應破壞水體的酸堿平衡,從而不利于魚(yú)類(lèi)等動(dòng)物的生存;最后當酸洗廢液滲入到土壤中會(huì )使土質(zhì)損壞,從而影響農作物生長(cháng)。綜上,直接排放酸洗廢液不僅會(huì )對環(huán)境造成嚴重的危害,同時(shí)也浪費了酸洗廢液中的可循環(huán)利用的資源,這都不符合我國可持續綠色發(fā)展的戰略要求。<br /> 1.常規酸洗廢液處理技術(shù)<br /> 由于酸洗廢液存在的危害,需對其進(jìn)行妥善和慎重的處理,目前常規酸洗廢液的方法主要有以下幾種:<br /> (1)中和沉淀法<br /> 中和沉淀法是指向廢酸中添加生石灰等堿性試劑,與酸洗廢液中的游離酸進(jìn)行中和反應,并使金屬離子沉淀,經(jīng)多級沉淀分離,再用酸調節廢液的 PH 值至 5.6~6.5 之間,達到國家規定標準后進(jìn)行排放,其涉及的化學(xué)反應主要有以下:<br /> 2HCl+Ca(OH)2=CaCl2+2H2O<br /> 2FeCl2+2Ca(OH)2+H2O+1/2O2=2Fe(OH)3+2CaCl2<br /> 中和沉淀法處理廢酸具有原理簡(jiǎn)單、操作方便等優(yōu)點(diǎn),但其仍存在一些缺陷,一方面其處理過(guò)程需消耗大量的堿性中和劑,并且廢酸中大量的游離酸被中和消耗,浪費了資源,另一方面處理過(guò)程還會(huì )產(chǎn)生很多泥渣,造成二次污染,因此還需進(jìn)行二次處理,一般是通過(guò)將泥渣送到廢料場(chǎng)進(jìn)行填埋或送到回收站進(jìn)行加工后再利用,這都需要耗費大量的資源。<br /> (2)高溫焙燒法<br /> 高溫焙燒法是一種資源化處理廢酸的方法,主要用于鹽酸酸洗廢液的處理,它能夠同時(shí)回收廢酸中的鹽酸和鐵等資源,其原理是酸洗廢液中殘留的鹽酸在高溫下蒸發(fā)變成蒸汽,而亞鐵鹽則在高溫和有充足水蒸氣、適量氧氣的氣氛中定量水解生成氧化鐵和氯化氫,其反應方程式如下:<br /> 4FeCl2+O2+H2O→Fe2O3+8HCl?<br /> 高溫焙燒法處理廢酸具有廢液處理量大、產(chǎn)生的廢棄物少、資源回收率高等優(yōu)點(diǎn),不僅能回收高濃度的酸,將其直接回用到酸洗工藝中,同時(shí)還能回收廢酸中的金屬得到氧化鐵,將其用做冶煉以及生產(chǎn)磁性材料和顏料。但高溫焙燒法處理廢酸仍存在一些缺點(diǎn),如處理工藝復雜,需要使用的設備較多,對設備的耐腐蝕性要求高,因此設備投資成本大,運行費用高,比較適合于大型鋼鐵企業(yè),而限制了在一些中小型企業(yè)中的應用。<br /> (3)蒸發(fā)法<br /> 蒸發(fā)法是一種能夠分離酸和金屬鹽的廢酸處理方法,主要用于易揮發(fā)性酸(如鹽酸)的回收,其原理是通過(guò)加熱使酸揮發(fā)變成蒸汽再經(jīng)冷凝從而得到酸液,而金屬鹽則留在母液中,通過(guò)冷卻結晶與母液進(jìn)行分離。<br /> 蒸發(fā)法能夠有效回收廢酸中的金屬鹽和游離酸,但蒸發(fā)法處理廢酸的工藝過(guò)程需要較高的溫度,而且酸洗廢液具有較強的酸腐蝕性,因此對設備的耐腐蝕要求高。此外,蒸發(fā)法得到的酸濃度較低,且設備維護費用高,因而在實(shí)際應用中還是有一定的局限性。<br /> (4)溶劑萃取法<br /> 溶劑萃取法是利用酸洗廢液中各組分在互不相溶的溶劑中分配系數的不同,將金屬離子從酸洗廢液中萃取出來(lái),從而實(shí)現酸與金屬離子的分離。溶劑萃取法處理廢酸具有一些優(yōu)點(diǎn),如在常溫下就能進(jìn)行,而且能耗低。但高效的萃取劑一般多為含毒性的有機溶劑,而且處理過(guò)程需用使用大量的萃取劑,成本高。<br /> 2、金沃泰定制化工藝簡(jiǎn)介:<br />       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