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通过对比分析多种含铜蚀刻废液处理方法的优缺点,提出了优化的"酸碱蚀刻废液自中和-酸溶解-还原超临界水热合成"组合工艺方案,将废液中铜离子制备为纳米铜粉。首先将酸性、碱性蚀刻废液按一定比例混合发生中和反应生成沉淀,再采用硫酸溶解沉淀生成硫酸铜溶液,最后采用该硫酸铜溶液进行还原超临界水热合成反应制备纳米铜终产物。该工艺方案具有流程简单、易大规模应用、可实现废液零排放和纳米铜粉制备效率高等技术优势;处理废液的运行费用约为3500元/t,制备的纳米铜粉可获得极高的经济收益,在蚀刻废液的无害化处理及资源化利用领域中具有广阔的发展前景。 相似文献
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从含铜蚀刻废液中回收硫酸铜 总被引:8,自引:1,他引:8
采用酸性蚀刻液与碱性蚀刻液混合中和沉淀铜的方法生产硫酸铜。试验结果表明,最佳工艺条件为:中和反应pH=6~7,酸解反应每100g滤渣消耗95%(质量分数)硫酸30mL,硫酸铜产率为84%,纯度为96%。混合沉淀铜后滤液中仍含有大量的氯化铵和少量的二价铜离子,实验采用水合肼还原除铜,回收滤液用于配制新的蚀刻液。水合肼还原除铜工艺条件:pH为8,滤液与水合肼体积之比为100:3,二价铜离子的去除率达到96.8%。该工艺简单可行,操作方便,成本低,是一种处理印制电路板(PCB)企业蚀刻废水、回收铜的有效方法,有一定的应用价值。 相似文献
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PCB行业含铜蚀刻废液产量大、污染指数高,又是一种有价复合资源,本文论述了萃取-电积、隔膜电解、铁置换铜及生产硫酸铜等资源化利用技术,介绍了上述技术的适用范围及存在问题的解决方法,指出酸性蚀刻废液环保资源化处置途径。 相似文献
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1.专利发明名称化学抛光废磷酸液的回收处理方法。2.申请专利范围在处理金属铝和铝合金化学抛光用的磷酸废液时,在该废液中加入氟酸溶液以及下列药物的至少其中一种:氢氢化钠、氢氧化钾、氟化钠、氟化钾、酸性氟化钠和酸性氟化钾,从而使废液中之铝成份以难溶性之氟化铝结晶析出,来处理和回收化学抛光废磷酸液的方法。 相似文献
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硫酸/过氧化氢蚀刻工艺 总被引:4,自引:0,他引:4
1 引言 距今已有15个年头了,硫酸过氧化氢蚀刻工艺在缓慢地发展着。就其中原因,并非此种工艺不优越。实验证明该工艺具有如下优点:适应各种抗蚀层;蚀刻速度快,一般蚀刻速度为20~40μmmin,有的高达80μmmin;溶铜容量相当大,其值可达80~116gL。笔者测试可达143gL;蚀刻系数大,蚀刻质量高。在通常情况下,蚀刻系数为1∶1,国外曾报道为1.1~3.0之间。作者研制的蚀刻液蚀刻系数一般在1.43~3.33之间[1]。回收再生简便。该体系的废液只含有水和硫酸铜。只要将废液进行… 相似文献
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加入氢氧化钠溶液沉积去除酸性废蚀刻液中的铜离子,采用硝酸调节pH,加入铬酸钾指示剂,并用硝酸银滴定,测定酸性蚀刻液中的氯离子含量。具有终点易于观察,操作简单等优点,实用性强,可进行工业应用。 相似文献
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复分解法生产氢氧化钡过程中产生的硫,锌废渣有很高的回收利用价值,采用负压(真空)操作,液碱吸收,盐酸法联产氯化锌、硫氢钠和沉淀硫酸钡,使氢氧化钡废渣得到了很好的利用,这种联产方式工艺简单,技术先进,生产安全,经济效益较好。 相似文献
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中国印制电路板行业每年产生大量含铜蚀刻废液,其资源化产品已在多行业广泛应用,如:碱式氯化铜用于饲料和工业、硫酸铜用于工业和电镀、碱式碳酸铜用于催化剂和木材防腐剂等。但行业技术混乱,标准缺失,导致处理工艺和产品质量参差不齐,存在极大的环境风险和资源浪费,标准化需求十分迫切。重点介绍了印制电路板含铜蚀刻废液资源综合利用工艺和产品现行标准和发展趋势。指出应制定相应标准、设置严格的技术要求、严控特征污染因子、控制产品质量、约束和规范行业行为,以促进中国电路板蚀刻废液行业治理和铜盐工业生产和应用技术发展,推动中国循环经济发展和无废城市建设。 相似文献
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《分离科学与技术》2012,47(1-4):737-757
Abstract SCK·CEN has developed a process to separate boric acid during and/or after evaporation of the liquid waste from pressurized light-water reactors. The key goal is to achieve higher waste volume reduction factors, while maintaining low activity discharge limits. An additional goal is to obtain purified boric acid for recycling. The process is based on the volatility of boric acid in steam. The liquid waste is treated in a semicontinuous evaporator, which operates preferentially at a higher temperature than the present evaporators. The stream loaded with boric acid is fed to a column for fractional condensation with partial reflux. In this way, one obtains a highly concentrated waste that contains all the radioactive and chemical impurities and little boron, a concentrated boric acid solution which can be reused, as well as a highly decontaminated effluent without boron. In case replacement or adaptation of existing evaporators is less practical, one can adapt the process for the treatment of evaporator concentrates. After having been intensively tested at SCK·CEN, the process has recently been demonstrated in a small pilot installation and with realistic liquid waste, at the nuclear power station in Doel, Belgium. The results corresponded to the theoretical predictions. After a transitional period, the boron concentration in the evaporator no longer increased and consequently did not limit the achievable waste volume reduction factor. The boric acid was recovered from the steam and during a supplementary treatment we recovered additional boric acid from the waste concentrate. 相似文献
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提出ADC发泡剂生产中产生的氯化母液[W(HCI)=12%~16%]的回收工艺:通入氯化氢气体,至吸收液中的W(HCl)≥30%,静置,排出盐泥。该工艺简单,操作简便,不仅节约污水处理费用,减轻ADC生产的环保压力,而且得到的清液可作为副产盐酸销售,提高经济效益。 相似文献
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C. Negro R. Latorre F. Lopez-Mateos J. Dufour A. Formoso 《Chemical Engineering Communications》1996,145(1):53-71
The aim of the research project presented in this paper is to devise a process to treat waste liquors from the pickling of iron or steel with hydrochloric acid in rolling mills, recovering the high iron content in the form of oxides or oxyhydroxides which can later be used in other industrial processes. In addition to reducing water pollution, such a process attaches a new value to this ferrous waste.
Chlorinated liquors are oxyprecipitated, leading to the formation of different combinations of iron oxides and oxyhydroxides, with the total removal of Fe+2 and the production of ammonium chloride solutions easily broken down into hydrochloric acid and ammonia. The precipitates have different industrial outlets, making the oxyprecipitation process an attractive solution for the treatment of waste pickling liquors. 相似文献
Chlorinated liquors are oxyprecipitated, leading to the formation of different combinations of iron oxides and oxyhydroxides, with the total removal of Fe+2 and the production of ammonium chloride solutions easily broken down into hydrochloric acid and ammonia. The precipitates have different industrial outlets, making the oxyprecipitation process an attractive solution for the treatment of waste pickling liquors. 相似文献