本文選題：銀礦 + 含氰廢水　； 參考：《武漢工程大學》2015年碩士論文

【摘要】：銀礦含氰廢水主要含有氰化物和重金屬,氰化物屬于劇毒物質(zhì),重金屬是難降解物質(zhì),從環(huán)境生態(tài)和生物安全角度,重視銀礦含氰廢水的有效處理是十分必要的。本文在總結含氰化物及重金屬廢水的處理方法的基礎上進行了闡述,結合目前企業(yè)含氰廢水中存在的問題,探究了硫酸亞鐵—高鐵酸鉀聯(lián)合法處理銀礦含氰廢水,通過單因素實驗及正交實驗分析了不同條件對含氰廢水中總氰化物和重金屬元素的去除效率的影響,同時分析將處理后的含氰廢水回用于氰化浸出段對產(chǎn)品品位的影響,得出以下結論:(1)實驗考察了采用硫酸亞鐵絡合反應時的pH值、硫酸亞鐵投加量、攪拌時間、絮凝劑投加量對含氰廢水中總氰化物和重金屬元素的去除效率的影響,結果表明:a.綜合考慮總氰化物和重金屬元素的去除效率,確定采用硫酸亞鐵絡合時控制第一次反應pH為10,第二次反應pH為6.5,硫酸亞鐵投加量為12.5g/L,攪拌時間25min,絮凝劑聚丙烯酰胺投加量為2mg/L時,總氰化物的去除率為98.48%,重金屬Cu的去除效率為75.55%,重金屬Zn的去除效率為65.57%;b.硫酸亞鐵正交實驗結果表明影響氰化物處理效果各因素的主次關系為:硫酸亞鐵投加量第一步反應pH值第二步反應pH值攪拌時間絮凝劑投加量。從氰化物的去除效率分析處理該水樣的最佳工藝條件組合為:硫酸亞鐵投加量為12.5g/L,絮凝劑投加量為2mg/L,第一步反應pH為12,第二步反應pH為6,攪拌時間為25min。(2)實驗考察了硫酸亞鐵—高鐵酸鉀聯(lián)合法處理含氰廢水時高鐵酸鉀的投加量、氧化反應pH值、氧化時間、反應溫度、絮凝反應pH值、絮凝時間對含氰廢水中總氰化物和重金屬元素的去除效率的影響,結果表明:a.綜合考慮總氰化物和重金屬元素的去除效率,聯(lián)合法處理含氰廢水的最佳條件為高鐵酸鉀的投加量達到0.4g/L,氧化反應pH值為10,氧化反應時間為25min,在反應溫度為25℃,絮凝pH值為10,絮凝時間為35min時,總氰化物的去除效率為99.98%,重金屬銅的去除效率為99.77%,重金屬鋅的去除效率為99.36%;b.通過硫酸亞鐵—高鐵酸鉀聯(lián)合法正交實驗考察了影響氰化物處理效果各因素的主次關系為:高鐵酸鉀投加量氧化反應pH值氧化時間反應溫度,聯(lián)合法處理氰化物投加高鐵酸鉀時最佳工藝條件組合為:高鐵酸鉀投加量為0.4g/L,氧化反應pH值為10,反應溫度為25℃,氧化時間為25min。采用廢水凈化處理的新工藝可實現(xiàn)廢水的零排放,解決了含氰廢水外排對環(huán)境的巨大危害,提高了清潔生產(chǎn)的程度,同時帶來良好的經(jīng)濟效益和環(huán)保效益。
[Abstract]:Cyanide and heavy metals are mainly contained in cyanide wastewater of silver mine, and cyanide is a highly toxic substance. Heavy metals are difficult to degrade. It is necessary to pay attention to the effective treatment of cyanide wastewater from the point of view of environment, ecology and biosafety. On the basis of summing up the treatment methods of cyanide and heavy metal wastewater, combined with the existing problems in cyanide containing wastewater in enterprises, the combined treatment method of ferrous sulphate and potassium ferrate was studied in this paper. The effects of different conditions on the removal efficiency of total cyanide and heavy metal elements in cyanide containing wastewater were analyzed by single factor experiment and orthogonal experiment. The following conclusions are drawn: (1) the effects of pH value, amount of ferrous sulfate, stirring time and flocculant dosage on the removal efficiency of total cyanide and heavy metal elements in cyanide containing wastewater were investigated. Considering the removal efficiency of total cyanide and heavy metal elements, When the pH of the first reaction is 10, the pH of the second reaction is 6.5, the dosage of ferrous sulfate is 12.5 g / L, the stirring time is 25 minutes, and the dosage of flocculant polyacrylamide is 2mg/L, the pH of the first reaction is 10, the second reaction pH is 6.5, the dosage of ferrous sulfate is 12.5 g / L, the stirring time is 25 minutes, and the dosage of flocculant polyacrylamide is 2mg/L. The removal rate of total cyanide is 98.48%, the removal efficiency of heavy metal Cu is 75.55, and the removal efficiency of Zn is 65.57%. The results of orthogonal experiment of ferrous sulfate showed that the primary and secondary relationship of the factors affecting the treatment effect of cyanide was: the dosage of ferrous sulfate in the first step, the pH value in the second step, the stirring time in the second step, the dosage of flocculant. According to the removal efficiency of cyanide, the optimum technological conditions for treating the water sample are as follows: the dosage of ferrous sulfate is 12.5 g / L, the dosage of flocculant is 2 mg / L, the pH of the first step is 12, the second step is pH 6, and the stirring time is 25 min. The dosage of potassium ferrate in the treatment of cyanide-containing wastewater by the combination of ferrous sulfate and potassium ferrate was studied. The effects of pH value, oxidation time, reaction temperature, flocculation reaction pH value and flocculation time on the removal efficiency of total cyanide and heavy metal elements in cyanide containing wastewater were studied. Considering the removal efficiency of total cyanide and heavy metal elements, the optimum conditions for the treatment of cyanide containing wastewater by the combined method are as follows: the dosage of potassium ferrate reaches 0.4 g / L, the pH value of oxidation reaction is 10, the oxidation time is 25 min, and the reaction temperature is 25 鈩，

本文編號：1916003