電鍍和金屬加工業(yè)廢水中鋅的主要來源是電鍍或酸洗的拖帶液。污染物經(jīng)金屬漂洗過程又轉(zhuǎn)移到漂洗水中。酸洗工序包括將金屬(鋅或銅)先浸在強酸中以去除表面的氧化物，隨后再浸入含強鉻酸的光亮劑中進行增光處理。該廢水中含有大量的鹽酸和鋅、銅等重金屬離子及有機光亮劑等，毒性較大，有些還含致癌、致畸、致突變的劇毒物質(zhì)，對人類危害極大。因此，對電鍍廢水必須認真進行回收處理，做到消除或減少其對環(huán)境的污染。
The main sources of zinc in wastewater of electroplating and metal processing industry are towing liquid of electroplating or pickling. Contaminants are transferred to the rinse water through the metal rinse process. The pickling process involves dipping a metal (zinc or copper) in a strong acid to remove the oxide from the surface and then dipping it in a brightening agent containing a strong chromic acid for polishing. The wastewater contains a large amount of hydrochloric acid, zinc, copper and other heavy metal ions and organic brightening agents, etc., which are highly toxic. Some of them also contain carcinogenic, teratogenic and mutagenic toxic substances, which are extremely harmful to human beings. Therefore, the electroplating wastewater must be seriously recycled and treated to eliminate or reduce its pollution to the environment.
電鍍廢水目前采用的工藝為：絮凝+次氯酸鈉破絡(luò)+調(diào)pH+捕捉劑+調(diào)pH+樹脂吸附
The current process of electroplating wastewater is: flocculation + sodium hypochlorite breaking + pH regulating + capturing agent + pH regulating + resin adsorption
樹脂吸附環(huán)節(jié)可以采用科海思的專用除重金屬螯合樹脂CH-90進口樹脂。
The resin adsorption process can adopt the special chelating resin CH-90 imported from cohays.
CH-90適用于制程或廢水中從一價金屬離子中選擇性的去除二價金屬離子的應用。二價金屬離子可以很容易的與單價金屬離子分離如銅、鎳、鉛、鋅等離子此二價金屬離子的去除應用 , 如 電鍍及金屬酸洗 , 水解冶金 ; 電池制造業(yè)的鉛去除 , 電子業(yè)等應用。
Ch-90 is suitable for selective removal of divalent metal ions from monovalent metal ions in process or wastewater. DivalentThe removal applications of the bivalent metal ions, such as electroplating and metal pickling, hydrolytic metallurgy; Battery manufacturingIndustrial applications such as lead removal, electronics, etc. metal ions can be easily separated from univalent metal ions, such as plasma.
CH-90樹脂典型參數(shù):
型式 : 弱酸型陽離子交換樹脂
結(jié)構(gòu) : 巨孔狀交叉鍵結(jié)聚苯乙烯
官能基
物理型式: 含水球狀
離子型式: 鈉
粒徑分布 :16to50
粒徑大小 :0.3to1.2mm總交換容量 :1.8meq/ml (H+)
膨脹系數(shù) :H+ → Na+ 20%
含水份: 45-50%
pH 作范圍:0to14
溶解率 : 不溶解于任何溶劑
逆洗沉降密度 :0.72to0.79g/ml
CH-90樹脂的主要優(yōu)勢有:
1、CH-90樹脂使用條件廣泛，可以用于高鹽水、PH值0-14的范圍內(nèi)去除重金屬；
2、CH-90樹脂對于弱酸型螯合劑產(chǎn)生的絡(luò)合鎳具有良好的吸附效果；
3、CH-90樹脂在相同項目中樹脂使用量少（一般為國產(chǎn)樹脂的三分之一左右）：
4、CH-90樹脂吸附飽和之后再生時間短（只需一小時左右）；
5、CH-90樹脂處理精度高，樹脂吸附之后出水可以做到0.02ppm以下；
6、CH-90樹脂吸附飽和周期時間長（具體時間根據(jù)具體項目覺得）；
7、CH-90樹脂對于二價金屬離子具有選擇吸附效果，在不同PH值環(huán)境下吸附優(yōu)先吸附不同離子
8、CH-90樹脂使用壽命長，同批樹脂可以使用3-5年左右；
9、CH-90樹脂吸附量大，理論吸附值可以達每升樹脂吸附65g銅；實際項目已經(jīng)做到每升樹脂吸附45g銅；
