CN109663480A - 一种应用于水银回收的方法 - Google Patents
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Abstract
一种应用于水银回收的方法,包括下列步骤:含银尾气送入填料塔进行碱洗,尾气进入填料塔下部,从填料塔下部进入塔内进行洗涤,采用8‑15wt%的BaCl2溶液、12‑18wt%的Ca(OH)2溶液和10‑20wt%氨水的混合液作为洗涤液,BaCl2溶液、Ca(OH)2溶液和氨水的质量比为4‑6∶12‑15∶1‑2,洗涤液从填料塔顶和塔中部的喷嘴分别对塔内尾气进行喷淋洗涤,填料塔内为逆流洗涤;洗涤液循环使用,尾气通过吸附装置后排空,吸附装置内设有膨润土吸附剂,膨润土吸附剂的制备方法如下:制备活性炭基膨润土,将膨润土和活性炭加水混合搅拌,静置沉降,固液分离后将得到固体经干燥、粉碎、筛分得到活性炭基膨润土;在活性炭基膨润土上负载5‑10wt%的氯化钡;在真空干燥4~6小时得到膨润土吸附剂。
Description
技术领域
本发明涉及一种应用于水银回收的方法。
背景技术
空气中银的浓度通常很低并影响甚微,但是一旦银进入水中,它可以在鱼中累积并对食用该被银污染的鱼的人们产生危害。氯化银催化剂是以煤化工为基础原料的″电石-乙炔″法合成氯乙烯单体(VCM)的催化剂,被广泛用于聚氯乙烯行业乙炔法PVC。在氯化银催化剂生产过程中,其产生的尾气中主要含有10-2000mg/Nm3的氯化银和1-100mg/Nm3的盐酸(HCl);当生产再生氯化银催化剂时,其尾气中还含有1-50mg/Nm3的氯气;尾气温度为90-105℃。对于尾气中这三种有害污染物,环保要求必须经过净化处理后才能排放。目前,传统处理尾气的方法主要有两种:①活性炭吸附法,该过程是在一个防腐的活性炭净化处理器中进行的,尾气通过该净化处理设施时,其中的氯化银被活性炭吸附,盐酸被活性炭以盐酸溶液的形式吸附,氯气被活性炭以次氯酸和盐酸(因尾气中含有一定量的水蒸汽,Cl2与H2O作用生成HClO和HCl)的形式被吸附,尾气中余热不回收。该方法的缺点是:处理后的尾气几乎很难达标排放,活性炭更换频繁,同时,尾气余热被白白浪费掉。②碱液(NaOH溶液)中和吸收法,该过程是使尾气与NaOH溶液充分接触,尾气中的HgCl2、HCl、Cl2与NaOH水溶液反应生成HgO、NaCl、NaClO,实现对尾气中有害污染物的脱除。一般情况下,该方法并不容易使净化处理后的尾气能够实现达标排放,特别是尾气中的银含量,同时,净化处理过程产生的固体废料,不能直接用于生产氯化银催化剂,只能作为含银废物处理,存在着二次污染的隐患;对尾气余热也没有回收利用,造成能量浪费。
发明内容
本发明的目的在于提出一种应用于水银回收的方法。
为达此目的,本发明采用以下技术方案:
一种应用于水银回收的方法,包括下列步骤:含银尾气送入填料塔进行碱洗,尾气进入填料塔下部,从填料塔下部进入塔内进行洗涤,采用8-15wt%的BaCl2溶液、12-18wt%的Ca(OH)2溶液和10-20wt%氨水的混合液作为洗涤液,BaCl2溶液、Ca(OH)2溶液和氨水的质量比为4-6∶12-15∶1-2,洗涤液从填料塔顶和塔中部的喷嘴分别对塔内尾气进行喷淋洗涤,填料塔内为逆流洗涤;洗涤液循环使用,尾气通过吸附装置后排空,吸附装置内设有膨润土吸附剂,膨润土吸附剂的制备方法如下:制备活性炭基膨润土,将膨润土和活性炭加水混合搅拌,静置沉降,固液分离后将得到固体经干燥、粉碎、筛分得到活性炭基膨润土;在活性炭基膨润土上负载5-10wt%的氯化钡;在真空干燥4~6小时得到膨润土吸附剂。
此方法可以尾气达标排放,尾气中银含量极低,满足国家排放标准。
具体实施方式
实施例1
含银尾气送入填料塔进行碱洗,尾气进入填料塔下部,从填料塔下部进入塔内进行洗涤,采用8-15wt%的BaCl2溶液、12-18wt%的Ca(OH)2溶液和10-20wt%氨水的混合液作为洗涤液,BaCl2溶液、Ca(OH)2溶液和氨水的质量比为6∶13∶2,洗涤液从填料塔顶和塔中部的喷嘴分别对塔内尾气进行喷淋洗涤,填料塔内为逆流洗涤;洗涤液循环使用,尾气通过吸附装置后排空,吸附装置内设有膨润土吸附剂,膨润土吸附剂的制备方法如下:制备活性炭基膨润土,将膨润土和活性炭加水混合搅拌,静置沉降,固液分离后将得到固体经干燥、粉碎、筛分得到活性炭基膨润土;在活性炭基膨润土上负载5-10wt%的氯化钡;在真空干燥4~6小时得到膨润土吸附剂。
实施例2
含银尾气送入填料塔进行碱洗,尾气进入填料塔下部,从填料塔下部进入塔内进行洗涤,采用8-15wt%的BaCl2溶液、12-18wt%的Ca(OH)2溶液和10-20wt%氨水的混合液作为洗涤液,BaCl2溶液、Ca(OH)2溶液和氨水的质量比为5∶12∶1,洗涤液从填料塔顶和塔中部的喷嘴分别对塔内尾气进行喷淋洗涤,填料塔内为逆流洗涤;洗涤液循环使用,尾气通过吸附装置后排空,吸附装置内设有膨润土吸附剂,膨润土吸附剂的制备方法如下:制备活性炭基膨润土,将膨润土和活性炭加水混合搅拌,静置沉降,固液分离后将得到固体经干燥、粉碎、筛分得到活性炭基膨润土;在活性炭基膨润土上负载5-10wt%的氯化钡;在真空干燥4~6小时得到膨润土吸附剂。
实施例3
含银尾气送入填料塔进行碱洗,尾气进入填料塔下部,从填料塔下部进入塔内进行洗涤,采用8-15wt%的BaCl2溶液、12-18wt%的Ca(OH)2溶液和10-20wt%氨水的混合液作为洗涤液,BaCl2溶液、Ca(OH)2溶液和氨水的质量比为4-6∶12-15∶1-2,洗涤液从填料塔顶和塔中部的喷嘴分别对塔内尾气进行喷淋洗涤,填料塔内为逆流洗涤;洗涤液循环使用,尾气通过吸附装置后排空,吸附装置内设有膨润土吸附剂,膨润土吸附剂的制备方法如下:制备活性炭基膨润土,将膨润土和活性炭加水混合搅拌,静置沉降,固液分离后将得到固体经干燥、粉碎、筛分得到活性炭基膨润土;在活性炭基膨润土上负载10wt%的氯化钡;在真空干燥4~6小时得到膨润土吸附剂。
实施例4
含银尾气送入填料塔进行碱洗,尾气进入填料塔下部,从填料塔下部进入塔内进行洗涤,采用8-15wt%的BaCl2溶液、12-18wt%的Ca(OH)2溶液和10-20wt%氨水的混合液作为洗涤液,BaCl2溶液、Ca(OH)2溶液和氨水的质量比为4-6∶12-15∶1-2,洗涤液从填料塔顶和塔中部的喷嘴分别对塔内尾气进行喷淋洗涤,填料塔内为逆流洗涤;洗涤液循环使用,尾气通过吸附装置后排空,吸附装置内设有膨润土吸附剂,膨润土吸附剂的制备方法如下:制备活性炭基膨润土,将膨润土和活性炭加水混合搅拌,静置沉降,固液分离后将得到固体经干燥、粉碎、筛分得到活性炭基膨润土;在活性炭基膨润土上负载9wt%的氯化钡;在真空干燥4~6小时得到膨润土吸附剂。
Claims (1)
1.一种应用于水银回收的方法,其特征在于包括下列步骤:含银尾气送入填料塔进行碱洗,尾气进入填料塔下部,从填料塔下部进入塔内进行洗涤,采用8-15wt%的BaCl2溶液、12-18wt%的Ca(OH)2溶液和10-20wt%氨水的混合液作为洗涤液,BaCl2溶液、Ca(OH)2溶液和氨水的质量比为4-6∶12-15∶1-2,洗涤液从填料塔顶和塔中部的喷嘴分别对塔内尾气进行喷淋洗涤,填料塔内为逆流洗涤;洗涤液循环使用,尾气通过吸附装置后排空,吸附装置内设有膨润土吸附剂,膨润土吸附剂的制备方法如下:制备活性炭基膨润土,将膨润土和活性炭加水混合搅拌,静置沉降,固液分离后将得到固体经干燥、粉碎、筛分得到活性炭基膨润土;在活性炭基膨润土上负载5-10wt%的氯化钡;在真空干燥4~6小时得到膨润土吸附剂。
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