Treatment of Arsenic Containing Waste Acid and Development of Arsenic Fixation Technology in Nonferrous Smelting
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摘要: 有色冶炼的含砷污酸处置伴随着大量含砷危险废弃物的排放，给企业运行和外部环境造成了巨大压力。为避免环境污染和含砷危险废弃物二次处置，以"废渣减量化、无害化及资源化"为目的的污酸处置技术受到广泛的关注，对迁移性较强的含砷危废进行稳定化处置作为解决现有危废处置的中主要手段也是当前研究重点。本文综述了石灰铁盐法、硫化法、臭葱石沉淀法、浓缩法以及含砷污酸处置技术，结合污酸处置中产生的主要含砷固废特性，对污酸处置和固砷技术进行了详细的分析。根据当前污酸处置技术的工业应用和最新研究进展，对含砷污酸处置和固砷新技术进行了展望。Abstract: The disposal of arsenic-containing wastewater in nonferrous smelting is accompanied by the discharge of a large number of arsenic-containing hazardous wastes, which brings great pressure to the operation and external environment of enterprises. In order to avoid environmental pollution and the secondary disposal of arsenic-containing hazardous waste, the treatment technology of wastewater with the purpose of "waste residue reduction, harmless and recycling" has attracted wide attention. The stabilization treatment of arsenic-containing hazardous waste with strong migration is also the main means to solve the existing disposal of hazardous waste. In this paper, the lime iron salt method, sulfuration method, scorodite precipitation method, concentration method and arsenic-containing wastewater treatment technology are summarized. Combined with the main characteristics of solid waste containing arsenic in the wastewater treatment, the wastewater treatment and arsenic fixation technology are analyzed in detail. Based on the current industrial application and the latest research progress of wastewater treatment technology, the prospect of new technology of arsenic-containing wastewater treatment and arsenic fixation is prospected.
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Key words:
- nonferrous smelting /
- arsenic /
- wastewater /
- arsenic fixation
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图 7 a.Fe-Si复合氧化物原位包裹臭葱石机理图；b.硅酸铝凝胶(壳)-臭葱石(核)机理图；c.Fe-Si复合氧化物包裹臭葱石的TEM-EDS图像；d.硅酸盐凝胶包裹臭葱石的SEM和EDS图像
Figure 7.
表 1 含砷固废的特征比较
Table 1. Comparison of characteristics of solid waste containing arsenic
渣的种类 组成 毒性(As) 是否为危废 处置情况 石灰铁盐渣 石膏(CaSO4·2H2O)、砷酸钙(Ca3As2O8)、砷酸铁(FeAsO4) >5 mg/L 危险废弃物 第三方处理/渣库堆存 钙砷渣 砷酸钙(Ca3As2O8)或亚砷酸钙(Ca3(AsO3)2) >5 mg/L 危险废弃物 第三方处理/渣库堆存 硫化砷渣 硫化砷(As2S3) >5 mg/L 危险废弃物 第三方处理/渣库堆存 臭葱石 臭葱石(FeAsO4·2H2O)、砷酸铁(FeAsO4) < 5 mg/L 一般固体废弃物 第三方处理/渣库堆存 浓缩产物 三氧化二砷(As2O3) >5 mg/L 危险废弃物 第三方处理/渣库堆存 
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表 2 污酸处置工艺方法比较
Table 2. Comparison of treatment methods of wastewater
方法 工艺 特点 原料 运行条件 成本 废渣 技术成熟度 石灰铁盐法 石灰-聚合铁盐 工艺简单、处置成本低，无害化处置不彻底，二次危废渣量大 石灰、铁盐 对条件无特殊要求 低 大 成熟 硫化法 硫化钠+石灰铁盐法 硫化剂成本较高、硫化砷渣渣量大、二次石膏渣渣量大 硫化剂、石灰、铁盐 对条件无特殊要求 高 大 成熟 臭葱石沉淀法 中和-合成臭葱石-深度净化 无危废石膏渣产生，固砷矿物臭葱石毒性达标，废水可回用。反应条件敏感需一定外部热源 铁盐 一定外部热源 低 小 不成熟 浓缩法 浓缩-脱氟氯-重金属回收 可回收硫酸和重金属，能耗高、设备材质要求高 高温 常压蒸发 低 部分成熟
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