第18卷第1期 2018年2月
过程与工艺
过程工程学报
The Chinese Jourmal of Process Engineering
VoL.18 No.1 Feb.2018
DOI: 10.12034/j.issn.1009-606X.217178
砷铁水热共沉淀制备大颗粒臭葱石
樊刚1，李兴彬，邓志敢"，李曼廷1
余自秀"，李存兄12"，魏昶，
(1.昆明理工大学冶金与能源工程学院，云南昆明650093；2.昆明高聚科技有限公司，云南昆明650106）
摘要：开展了硫酸体系中砷铁水热共沉淀为大颗粒晶型臭慧石的研究，考察了初始Fe/As摩尔比、初始pH、反应温度、搅拌速度和氧分压等因素对砷铁沉淀率、臭慧石晶型形成及臭葱石粒度的影响，结果表明，Fe/As摩尔比、初始pH及反应温度降低有利于形成纯净大颗粒臭慧石，臭葱石颗粒粒度与氧分压关系不大.高搅拌速度有利于形成纯净臭葱石，但不利于大颗粒臭葱石晶体的形成.在Fe/As摩尔比1.5、初始pH1.0、反应温度160C、搅拌速度500r/min和氧分压0.4MPa的优化条件下，除砷
率高于97%，沉砷渣中砷含量大于30%，平均粒度大于20μm. 关键词：含砷铁溶液：水热沉砷；臭葱石；砷铁沉淀率；粒度
中图分类号：TF09
文献标识码：A
文章编号：1009-606X(2018)01-012607
Preparation of Large-sized Scorodite Based on Arsenic and Iron Hydrothermal Co-precipitation
Zixiu YU', Cunxiong LI2", Chang WEI', Gang FAN', Xingbin LI', Zhigan DENG', Minting LI
(I.Faculty of Metallurgy and Energy Engineering,Kunming University of Science and Technology,Kunming. Yunnan 650093, China,
2. Kunming Gaoju Science and Technology Co., Lid., Kunming, Yinnan 650106, China)
Abstract: Coprecipitation of arsenic and iron in sulphuric acid system to produce large particle sized scorodite was carried out. The effects of initial Fe/As molar ratio, initial pH, temperature, agitation speed and oxygen partial pressure on scorodite crystalline formation, particle size distribution and the precipitation rates of As and Fe were investigated. The results showed that the decrease of Fe/As molar ratio, initial pH and temperature was beneficial to large and purified scorodite formation which was independent of oxygen partial pressure. Higher agitation speed was available for the formation of more purified scorodite but small-sized scorodite. The precipitation of As was higher than 97%, the content of arsenic in residue was larger than 30% and the average size of scorodite was larger than 20 μm eeda0asoeeo9edaodesesooa pressure 0.4 MPa.
Key words: arsenic and iron containing solution; hydrothermal precipitation of arsenic; scorodite; iron and arsenic removal rate;
particle size
1前言
碑毒性极强，具有生物积累性和致癌性。近年来，砷中毒事件频发受到广泛关注"，自然界中极少见自然砷或砷金属化合物，大多数以硫化物形式夹杂在金、铜、铅、锌、镍、钴等有色金属资源中，随这些金属资源的开采被带入冶金系统(2),矿业活动是砷的主要来源，其产砷量占总砷量的72.16%[3.4]，有色金属冶金是产生含砷废水的主要来源。对这些含砷物料处置不当或直接排放，是导致我国砷污染事件频发的主要原因之一[3]，当
前，有色冶金砷害治理已成为决定产业生存与发展的重大间题
针对砷害治理提出了许多沉砷方法，其中化学沉淀法运用最广、最有效，传统化学沉淀法(如砷酸钙法、非晶型砷酸铁法或硫化砷法)会产生大量的含碑危险固体废弃物，其稳定性不高，且很难转化为砷产品重新利用，堆存填埋费用高，易造成二次污染[6.7]
相对于传统砷酸盐沉淀法，臭葱石(FeAsO4-2H2O) 沉砷法具有砷饱和容量大、溶度积小、体积小、浸出毒性小、性质稳定、易于沉降过滤分离的优点[7.8，通常分
收稿日期：2017-03-17，修回日期：2017-05-05
基金项目：国家自然科学基金项目(编号：51664038,51474117,51364022,51564030)；云南省教育厅科学研究基金重大专项(编号：ZD2014003）作者简介：余自秀(1990-），女，四川省内江市人，硕士研究生，有色金属冶金专业，E-mail:15696058094@163.com：李存兄，通讯联系人，
E-mail: licunxiong@126.com
引用格式：余自秀，李存兄，就据，等，碑铁水热共沉淀制备大顺粒臭慧石.过程工程学报，2018,18(1):126-132.
Yu Z X, Li C X, Wei C, et al. Preparation of Large-sized Scorodite Based on Arsenic and Iron Hydrothermal Co-precipitation (in Chinese) Chin. J. Process Eng., 2018, 18(1): 126132, DOI: 10.12034/j.issn.1009-606X.217178,
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