Treatment And Resource Study Of Arsenic Pollution

Based on the predecessor's works, a new process of air oxidation flocculent precipitation from waste acid producing arsenic acid copper and arsenic trioxide is proposed in the paper, according to the main element properties and exist forms of arsenic waste acid and arsenic waste residue. The paper states selective arsenic removal by sulfurization-precipitation can be done during the production of indium .The paper also puts forward harnessing scheme of preventing arsenic-containing waste's effect on soil and set down to the study of arsenic-containing residue's caustic dross producing glass precipitation agent.The investigation results indicate that:(1) During the process of waste acid, based on the proposed result of air oxidation flocculent precipitation, arsenic in waste acid can be transformed to high-class white arsenic or arsenic acid copper product. The method 's raw material cost of dealing with waste acid is much lower than sulfurization-precipitation. Compared with the total wet method dealing with arsenic filtered dirt flow of Zhu You metal mine company, it has got many advantages including simple process, low investment and low production cost.(2) During the production of indium, selective arsenic removal by sulfurization-precipitation can be done thus the arsenic removal ratio can be up to 99.3%., indium and other value metal element loss is little. The arsenic-removal dreg is high with main content As₂S₃ mass fraction 95.4%, which make the dreg is liable to be utilized. Consequently the objectives of avoiding the generation of virulent arsine , eliminating the secondary arsenic pollution and waste of arsenic resource are resulted by the dregs.(3) According to the properties of hydrograph, constructing a arsenic-containing slag yard adjust measures to local conditions. Add solid arsenic and improved additive to slag yard can prevent arsenic-containing waste residue pollution on soil efficiently.(4) We can use arsenic alkali residue to produce glass precipitation agent, turning harm to good. It can be applied widely in industry and bring good society benefit.