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The preparation of copper arsenite with arsenic trioxide was presented and its application in the purification of copper electrolyte was proposed. The variables of n(OH^-)/n(As), n(Cu)/n(As), NaOH concentration, reaction temperature and pH value have some effects on the yield of copper arsenite. The optimum conditions of preparing copper arsenite are that the molar ratio of alkali to arsenic is 2:1, NaOH concentration is 1 mol/L, the molar ratio of copper to arsenic is 2:1, pH value is 6.0 and reaction temperature is 20℃. The yield of copper arsenite is as high as 98.65% under optimum conditions and the molar ratio of Cu to As in the product is about 5:4. The results of the purification experiments show that the removal rate of antimony and bismuth is 53.85% and 53.33% respectively after 20g/L copper arsenite is added. The purification of copper electrolyte with copper arsenite has the advantages of simple technique, good purification performance and low cost. 相似文献
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Copper electrolyte was purified by copper arsenite that was prepared with AS2O3. And electrolysis experiments of purified electrolyte were carried out at 235 and 305 A/m^2, respectively. The results show that the yield of copper arsenite is up to 98.64% when the molar ratio of Cu to As is 1.5 in the preparation of copper arsenite. The removal rates of Sb and Bi reach 74.11% and 65.60% respectively after copper arsenite is added in electrolyte. The concentrations of As, Sb and Bi in electrolyte nearly remain constant during electrolysis of 13 d. The appearances of cathode copper obtained at 235 and 305 A/m^2 are slippery and even, and the qualification rate is 100% according to the Chinese standard of high-pure cathode copper(GB/T467-97). 相似文献
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本文介绍了在亚砷酸工艺中处理结晶硫酸铜母液的方法。该方法充分利用了液相中的高价砷,以降低亚砷酸工艺过程中铜的消耗。 相似文献
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利用含砷废酸制备亚砷酸铜,并将所得亚砷酸铜应用到铜电解液的净化。研究结果表明:使用NaOH溶液调节废酸pH值为6.0时,废酸中Pb,Cu,Fe和Mg杂质的去除率达到90%以上,砷保留率为89.0%;除杂后,加入CuSO4和NaOH溶液,当pH=8,m(Cu):n(As)=2:1,反应温度为20℃,反应时间为1h时,亚砷酸铜的产率达到98.2%;所得亚砷酸铜为非晶体,其中Cu与As的物质的量比为2.15;当铜电解液中加入20g/L亚砷酸铜时,铜电解液中Sb和Bi分别从0.65g/L和0.15g/L降到0.30g/L和0.07g/L,Sb和Bi去除率分别达到53.85%和53.33%。 相似文献
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有色冶炼企业产生大量含砷废水,砷对人体内酶蛋白的巯基具有特殊亲和力,特别是与丙酮酸氧化酶的巯基容易结合为复合物,影响细胞正常新陈代谢,导致细胞死亡,损害神经细胞,导致多发性周围神经炎,并造成肝脏、心脏器官的损害。而含砷废水的处理产物亚砷酸铜可用作农业杀虫剂、除草剂、抗真菌剂和灭鼠剂,在子弹诱饵中可作为毒药使用,也可用于制备三氧化二砷的原料。本文采用硫酸铜沉淀法进行废水脱砷,考察了硫酸铜用量、反应温度、反应时间、搅拌速度和溶液pH值等对含砷废水脱砷效果的影响。结果表明:硫酸铜用量为n(Cu)/n(As)=2.0,搅拌速度50 r/min,在20℃下反应2.0 h,调节溶液pH为8.0,亚砷酸铜的产率为97.23%,且生产实践同样证明了采用硫酸铜沉淀法处理含砷废水是可行的。通过本文工艺实现了有价资源无害化利用,为有色冶炼企业含砷废水处理提供重要数据支撑。 相似文献
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洗涤冶炼烟气产生的含砷酸性废水的利用及处理 总被引:3,自引:0,他引:3
以洗涤冶炼烟气含砷酸性废水为原料,采用CaO和NaOH分段中和后加入硫酸铜制备得到亚砷酸铜.一段中和时每升废水加入氧化钙16g,二段中和时加入氢氧化钠调节废水pH值为6.0,中和后废水中Pb、Cu、Fe、Mg杂质去除率达到90%以上,砷损失率约为7%.按照铜砷物质的量之比2:1,在中和后废水中加入硫酸铜,采用氢氧化钠溶液调节溶液pH值为8,经过过滤、洗涤、干燥得到亚砷酸铜,其砷转化率达到98.2%.制备亚砷酸铜后的废水采用石灰-聚合硫酸铁絮凝处理,当石灰调节废水pH值为9.0、铁砷物质的量之比为8:1时,处理后废水中砷含量为0.30 mg/L,达到了国家废水排放标准(GB 8978-1996). 相似文献
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为优化高碱条件下硫代亚砷酸萃取工艺,研究碱性水溶液中亚砷酸硫化过程热力学。基于已有的热力学数据,绘制了298K条件下As~(III)-S-H_2O系各种As~(III)离子随pH及S/As摩尔比变化的浓度曲线,分别讨论了pH和硫化剂加入量对亚砷酸硫化过程的影响以及硫化反应产物形态。结果表明,在碱性介质中,亚砷酸硫化反应在热力学上是可行的。在高碱条件下,亚砷酸硫化反应可能受抑,通过提高硫化剂用量,可强化硫化过程。 相似文献
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