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化学镀Ni-P合金废液中P元素的去除(2)

时间:2019-10-21 20:28来源:毕业论文
The research analysis shows that when we directly use chemical precipitation method, because the waste liquid contains no oxidation of hypophosphite and complexing agent which can greatly affect the p


The research analysis shows that when we directly use chemical precipitation method, because the waste liquid contains no oxidation of hypophosphite and complexing agent which can greatly affect the precipitation of phosphite and orthophosphate, which has resulted in incomplete removal of total phosphorus, removal efficiency with only 30%.
Making dephosphorization of waste liquid without nickel by oxidation broken network, we study the influence of the change of reaction concentration, the type of oxidant, reaction time and pH value of precipitation. The rate of dephosphorization in the wastewater can reach 80%-90% at this time, integrated the second pond, the total phosphorus content in comprehensive secondary settling tank wastewater can be reduced to 0.5 ppM.In comparison with prior to using this method, removal rate of the total phosphorus was increased by 35.94% and 40.37% respectively.
Finally, we has studied the effect of removal of total phosphorus in extreme conditions of wastewater, and analyzed the effect of low pH, high pH, low temperature on the removal effect of the total phosphorus.
Key words: electroless nickel plating;waste liquor;phosphorus
目  录
1.前言    5
1.1研究的目的和意义    5
1 .2化学镀镍废液处理回收中去磷的研究现状    7
1.2.1 生物除磷    7
1.2.2 物理化学法除磷    8
1.2.3 化学除磷    8
1.2.4 亚铁除磷机理    9
1.3本课题研究的主要内容    10
2 材料与实验方法    11
2.1实验材料    11
2.1.1主要化学试剂    11
2.1.2主要仪器设备    11
2.2实验方法    11
2.2.1 实验原理    11
2.2.2实验方法    12
2.2.3试验水样    12
2.2.4分析方法    12
2.2.4.2总磷的测定    13
3实验结果与讨论    14
3.1化学镀镍废液中镍的去除    14
3.2标准曲线的绘制    15
3.3废液中磷的去除    15
3.3.1不同氧化剂对废液中次磷酸根氧化效果的影响    16
3.2.2搅拌对废液中总磷去除的影响    20
3.2.3反应时间对废液中总磷去除的影响    20
3.2.4沉淀反应PH值对磷去除的影响    21
3.2.5反应温度对磷去除的影响    22
3.2.6氢氧化钙加入量对磷去除的影响    24
3.3综合废水二沉池中磷的去除    25
3.3.1综合废水二沉池中次磷酸根的氧化    25
3.3.2综合废水二沉池中沉淀pH值对于总磷去除的影响    26
4结论    27
5致谢. 30
参考文献    31
1.前言
1.1研究的目的和意义
1946年,化学镀Ni-P镀层从镍盐和次磷酸盐等组成的溶液中被获得,这一发现,是由两位英国科学家[1]提出。这一镀层的发现,使得化学镀镍被各行各业广泛关注,并运用其中。除日常相关的医疗、汽车、机械、模具、纺织、食品等领域,高新科技行业中也有涉及,如航空航天、电子计算机、石油化工等[2-5]。其硬度高、耐磨性良好、镀层均匀、不受形状限制且不用外加电源等特点使得市场需求量日趋增长,世界各国化学镀镍相关企业涌起。其中,属于我国的化学镀镍企业与美国相比,所占比例较少,但也达到300多家,美国化学镀镍企业产值巨大,突破10亿,其离不开所属企业的数量,将近是中国企业的十倍,达到200多家。化学镀镍技术的蓬勃发展,离不开其理论的深入研究和工艺技术的革新[18-19]。 化学镀Ni-P合金废液中P元素的去除(2):http://www.youerw.com/huaxue/lunwen_41177.html
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