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<p>　樹(shù)脂的原理</p><p>　　通過(guò)離子交換技術(shù)，使水的硬度小于50mg/L(CaCO3)離子交換是一種特殊的動(dòng)態(tài)吸附過(guò)程，一般是由不溶于水的離子交換劑在電解質(zhì)溶液中進(jìn)行，這種離子交換劑即為離子交換樹(shù)脂。目前離子交換裝置有一半以上用于水處理脫鹽，而水處理脫鹽的主要是強(qiáng)酸性氫型陽(yáng)離子交換樹(shù)脂和強(qiáng)堿性氫氧型陰離子交換樹(shù)脂。當(dāng)氫型陰陽(yáng)離子交換樹(shù)脂與水接觸，發(fā)生離子交換反應(yīng)，水中各種陽(yáng)離子被吸附在樹(shù)脂上，而陽(yáng)樹(shù)脂上結(jié)合的氫離子則被交換下來(lái)，此時(shí)水中只含有氫離子一種陽(yáng)離子。當(dāng)氫氧型陰樹(shù)脂與水接觸發(fā)生離子交換反應(yīng)后，水中各種陰離子被吸附，則水中只含有一種氫氧根離子。當(dāng)經(jīng)過(guò)這種氫氧型陽(yáng)樹(shù)脂的水再經(jīng)過(guò)氫氧型陰樹(shù)脂后，則水中僅含有兩種陰陽(yáng)離子(氫離子和氫氧根離子)就會(huì)結(jié)合成為水，也就完成了水的脫鹽處理過(guò)程。</p><p>樹(shù)脂</p><p>　　樹(shù)脂的樹(shù)脂活化</p><p>　　無(wú)論是陽(yáng)樹(shù)脂或陰樹(shù)脂，當(dāng)使用若干周期后，都會(huì)發(fā)生交換容量下降的現(xiàn)象。容量下降的原因，一方面是由于采用不*再生，樹(shù)脂上有一定量的未被再生下來(lái)的離子逐漸累積，影響交換的正常進(jìn)行;另一方面，例如含鉻廢水中的H2CrO4及H2Cr2O7等對(duì)樹(shù)脂都有氧化作用，使樹(shù)脂中Cr3+越來(lái)越多，影響樹(shù)脂的正常工作。因此，當(dāng)樹(shù)脂容量有顯著下降的趨勢(shì)時(shí)，應(yīng)進(jìn)行樹(shù)脂的活化。</p><p>樹(shù)脂</p><p>　　華偉陰樹(shù)脂的活化</p><p>　　陰樹(shù)脂的活化措施，應(yīng)視所處理的廢水而異。國(guó)內(nèi)對(duì)處理含鉻廢水的陰樹(shù)脂活化有比較成功的經(jīng)驗(yàn)。其原理操作如下：將陰樹(shù)脂正常再生之后，浸泡于2～2.5mol//1H2SO4溶液中，然后在徐徐攪拌下加入NaHSO3，將樹(shù)脂上的Cr6+還原成Cr3+。樹(shù)脂在上述溶液中浸泡一晝夜，然后用清水洗凈，以上過(guò)程重復(fù)1～2詞，即可將樹(shù)脂中的Cr6+及Cr3+除去，再用NaOH轉(zhuǎn)型待用。</p><p>華偉樹(shù)脂</p><p>　　陽(yáng)樹(shù)脂的活化</p><p>　　陽(yáng)樹(shù)脂活化的主要目的是去除樹(shù)脂上累積的重金屬離子，尤其是那些與樹(shù)脂結(jié)合力較強(qiáng)的高價(jià)陽(yáng)離子，如Fe3+，Cr3+等。可在體內(nèi)活化，活化液用量為2倍樹(shù)脂體積，現(xiàn)用濃度為3.0mol/1的鹽酸配置，以再生流速通過(guò)樹(shù)脂層，再用1～2倍樹(shù)脂體積，濃度為2.0～2.5mol/1的硫酸溶液浸泡樹(shù)脂，歷時(shí)一晝夜(至少8小時(shí))，樹(shù)脂中的Fe3+，Cr3+及其他重金屬離子便基本去除，淋洗后樹(shù)脂便可待用。</p> 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