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铁盐沉淀固化含砷硫酸烧渣酸浸液中的砷
Arsenic Fixation in Acid Leaching Solution From Arsenic-containing Pyrite Cinder by Iron Salt Precipitation
投稿时间:2018-07-13  修订日期:2018-11-06
DOI:
中文关键词:  硫酸烧渣  酸浸脱砷  铁盐固砷  浸出毒性
英文关键词:pyrite cinder  acid leaching for arsenic removal  arsenic fixation by iron salt  leaching toxicity
基金项目:中国科学院重点部署项目
作者单位E-mail
王永良 中国科学院过程工程研究所多相复杂系统国家重点实验室 jakese@163.com 
肖力 中国科学院过程工程研究所多相复杂系统国家重点实验室  
韩培伟 中国科学院过程工程研究所多相复杂系统国家重点实验室  
鲁永刚 中国科学院过程工程研究所多相复杂系统国家重点实验室  
钱鹏 中国科学院过程工程研究所多相复杂系统国家重点实验室  
叶树峰 中国科学院过程工程研究所多相复杂系统国家重点实验室  
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中文摘要:
      为了考察含砷硫酸烧渣中酸浸脱砷效果和铁盐沉淀固砷行为,采用常温常压酸浸的方式脱除硫酸烧渣中的砷,对进入浸出液中的砷以铁盐沉淀的形式脱除,进而对沉淀渣的浸出毒性进行研究。研究了磨矿细度、酸浓度、固液比及浸出时间对硫酸烧渣中砷脱除效率的影响,结果表明通过控制浸出参数可以将硫酸烧渣中砷的质量分数降低到0.2%以下。通过调节浸出液的pH和Fe/As摩尔比将其中的砷以沉淀的形式脱除,当Fe/As大于2,pH在4~6时,溶液中砷浓度降低到了0.5 mg﹒L-1以下。得到的沉淀砷渣主要是以非晶态的形式存在,提高铁砷比有利于提高砷渣的稳定性,降低浸出毒性。在Fe/As = 3,pH = 6.04~6.22的条件下得到的沉淀渣的浸出毒性为0.711 mg﹒L-1。因此,通过酸浸脱除硫酸烧渣中的砷,进而采用铁盐沉淀的方法能够实现硫酸烧渣中砷的安全处置。
英文摘要:
      In order to investigate the effect of arsenic removal from arsenic-containing pyrite cinder using acid leaching method and the behavior of arsenic fixation by conventional iron salt precipitation, the arsenic containing in the cinder was removed by acid leaching at room temperature and atmospheric pressure, and the arsenic in leaching solution was removed by iron salt precipitation, then the leaching toxicity of precipitates was studied. The effects of grinding fineness, acid concentration, solid-liquid ratio and leaching time on arsenic removal efficiency were studied. The results show that the arsenic content of the pyrite cinder can be reduced to less than 0.2% by controlling leaching parameters. The arsenic in the leaching solution can be removed by adjusting the pH and Fe/As molar ratio. The arsenic concentration decreased below 0.5 mg﹒L-1 when the Fe/As ratio was greater than 2 and the pH value was between 4 - 6. The results demonstrate that the precipitates mainly exist in the form of amorphous, and increasing the Fe/As ratio can improve the stability and reduce the leaching toxicity of the residue. The leaching toxicity of the precipitates was decreased to 0.711 mg﹒L-1 under the condition of Fe/As = 3, pH = 6.04 - 6.22. Therefore, the safe disposal of arsenic can be realized by acid leaching to remove arsenic from pyrite cinder and then iron salt precipitation.
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