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Gold Science and Technology ›› 2018, Vol. 26 ›› Issue (1): 124-129.doi: 10.11872/j.issn.1005-2518.2018.01.124

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Study on Arsenic Removal from Bacterial Oxidation of Liquid Arsenical Ores and Stability of Arsenic Calcium Residue

CHEN Yajing,YANG Hongying,TONG Linlin,JIN Zhenan   

  1. School of Metallurgy,Northeastern University,Shenyang    110819,Liaoning,China
  • Received:2017-07-10 Revised:2017-08-19 Online:2018-02-28 Published:2018-05-19

Abstract:

Taking strong acid bacterial oxidation liquid with high arsenic and high iron produced by the bacterial oxidation gold extraction of one gold mine in Gansu Province as the research object,and selecting calcium oxide as precipitant to carry out the experiment of neutralization and arsenic removal.Through investigated the effect of the parameters such as pH value,temperature,stirring speed and reaction time on neutralization and arsenic removal,the best arsenic removal conditions were determined by single factor test. The influence of arsenic and calcium residue stability in simulated natural environment was explored.The results of arsenic removal test showed that the arsenic removal ratio was 99.99% under the optimal condition:pH=4~5,suitable stirring speed,reaction for 25 min at normal temperature and achieved the purification of waste liquid.The results of quantitative analysis of arsenic and calcium residue showed that the content of As and Fe in residue were 4.04% and 19.79% respectively.The experimental results on the stability of arsenic and calcium residue in simulated natural environment showed that:when the pH value was lower than 1,the arsenic in residue was dissolved out of 5 mg/L,exceeding emission standards of industrial waste.According to the results,it is possible to purify the wastewater by neutralizing arsenic with calcium oxide as precipitant,and the arsenic containing could be stored when the environmental pH≥1.

Key words: bacterial oxidation liquid, neutralization and arsenic removal, single factor experiment, arsenic removal radio, arsenic iron coprecipitation, arsenic and calcium residue;pH;stability

CLC Number: 

  • TF18
 
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