芬顿法脱除锰电解液中残余有机物的研究-化学工程专业毕业论文.docx

H202/Fe2+摩尔比5,在30℃温度下反应60 min,溶液COD脱除率达到
%。
,以COD脱除率为响应值,对初始pH值、Fe2+离子投加量和Hz02/Fe2+摩尔比的工艺参数进行研究并优化。结果表明:Fe2+离子投加量对COD脱除率的影响最显著,H202/Fe2+摩尔比
次之,初始pH值最小;在Fe2+·L’‘,H202/Fe2+,,%,与响应面模型预测值误差小于2%。证明利用芬顿反应脱除硫酸锰溶液中残余有机物的方法是可行的。
对锰电解液进行紫外扫描分析表明,溶液中的有机物主要是小分子物质。芬顿反应过程十分迅速,且随着反应时间的延长,溶液中仍然有一部分小分子有机物不被氧化分解;对Fenton反应过程中pH值检测结果表明, 温度升高会导致锰电解液的pH值下降,而初始pH值越低导致芬顿反应脱除效果降低。锰电解液体系pH值明显低于硫酸锰溶液体系,说明在芬顿反
应降解有机物的过程中,产生了一定量的酸性物质。对不同浓度的Mn2+、 S04。、F‘、C1’离子对芬顿反应影响的研究结果表明,Mn2+和Cl‘离子可抑制芬顿反应的进行,导致COD脱除率下降;S042‘对芬顿反应无影响;F。离子由于能与Mn2+反应,阻碍了Mn2+对芬顿反应的抑制作用,但过量的F。离子会导致COD脱除率下降。
关键词:锰电解液有机物芬顿反应COD脱除率机理
万方数据
Study on the anics Removal from Manganese
Electrochemical Solution by Fenton process
ABSTRACT
Manganese lS an important metal that widely used in metallurgy and chemical the rapidly growth of demand,the reserve and grade of manganese carbonate ore was fallen sharply,SO it iS important to develop and utilize manganese oxide recent years,some works have demonstrated the potential use of carbohydrates,agriculture and forestry byproduct as reducing agent to leaching manganese oxide ore in diluted acid the reductants have the advantages of high efficiency,environmental protection and 10'W ,it would produce a lot anic derivatives such as small anic acid and aldehydes during the leaching of manganese ores. anic derivatives may cause a certain influence to the electrolysis efficiency and corrosion the anode ,it is necessary to remove the anic from manganese electrochemi cal solution.
The oxidation removal process for the anics using Fenton reagent as the oxidizing agent was statistically analyzed in manganese electrochemical oxygen demand(COD)removal has been chosed as the target parameter to evaluate the removal main contents
were as follows:
Single—factor experiments were employed to examine the influences of initial pH,ferrous ions