铅锌冶炼废水处理技术研究

发布时间：2018-01-04 16:00

本文关键词：铅锌冶炼废水处理技术研究　出处：《西安建筑科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：2007年,甘肃省成州锌业有限责任公司(以下简称:成州锌业)在每年原有5万t生产规模的基础上,投资4.4亿资金再每年新增5万t电锌生产能力,技改扩建后,锌冶炼厂每年生产能力总规模达到10万t锌锭、硫酸18万t。由于项目建设所在地水源不丰富,成州锌业是用水大户,必须节约用水,生产废水实现“零”排放。铅锌废水通过深度处理回用后,可节约大量宝贵的地下水资源,减少对成县南河水体的污染,可以实现锌冶炼废水的再生利用。分三段工艺处理铅锌废水:一段石灰石中和处理污酸。二段硫化处理;主要去除一段pH值2~3的污酸废水中的砷、汞重金属。三段石灰-铁盐法-微滤-钠滤-工业反渗透处理污水。一段处理来自硫酸净化工艺,通过石灰石中和,出水pH值控制在2~3。二段处理接自污酸处理工序,二段一级反应pH值不大于5,去除重金属砷,二段二级反应pH值不大于9,去除重金属汞,pH值在二段三级反应过程中不大于12,沉淀。三段处理把污酸处理后液、冶炼洗涤废水、初期雨水及冲洗地坪等产生的污水进行处理,通过中和-氧化-微滤-纳滤-反渗透工艺,投加絮凝剂,出水pH值控制在8~9,去除铅、锌等重金属,污水回用。该项目在2010年3月开工建设。年产10万吨锌锭的冶炼技改扩建工程完成后,每年总用水量是2755.8×104m3,其中新鲜水用量为31.082×104m3/a、循环水用量为2619.309×104m3/a,废水排放量为104.9×104m3/a。工程投入生产后,根据不同水质要求,处理后回用水用于全厂各生产系统,每天减少污水排放量3178.13m3,废水循环利用率达到95%以上,减少悬浮物7.60t/a、化学需氧量9.72t/a、氟0.05t/a、锌0.12t/a、铅0.03t/a、镉0.01t/a、铜0.01t/a、砷0.001t/a的排放。成州锌业铅锌废水循环利用工程项目的实施可为成州锌业每年节约新水用量达104.9万m3(按一年330天计),减少重金属废水对地表水的污染。
[Abstract]:In 2007, Gansu Province Chenzhou zincind Co Ltd (hereinafter referred to as: Chenzhou zincind) based on the original 50 thousand T annual production scale, investment funds 440 million to an annual increase of 50 thousand T electrolytic zinc production capacity, technological expansion, the total size of the zinc smelting plant annual production capacity reached 100 thousand T sulfuric acid zinc ingots, 180 thousand T. due to the project the construction of the local water is not abundant, Chenzhou zincind is a large amount of water, must save water and wastewater to achieve "zero" emissions. Lead zinc wastewater reuse through the depth of treatment, can save a lot of valuable groundwater resources, reduce water pollution of Nanhe County, can realize the recycling of zinc smelting wastewater process is divided into three sections. Treatment of wastewater: a lead-zinc limestone neutralization treatment of waste acid. Two vulcanization treatment; a pH value mainly to remove acidic wastewater in 2~3 arsenic, mercury. Three stage lime ferric salt - sodium - microfiltration reverse osmosis filter industry Through a period of treatment. Treatment of wastewater from sulfate purification process, through limestone neutralization, effluent pH value control treatment received from the waste acid treatment process in the two 2~3., two first-order reaction pH value not greater than 5, the removal of heavy metal arsenic, two two grade reaction pH value not greater than 9, the removal of Hg, pH value in the three stage reaction process two is not greater than 12. The three section of precipitation treatment of waste acid solution after washing wastewater, smelting, and initial rainwater from the floor washing wastewater by neutralization, oxidation and microfiltration of nanofiltration and reverse osmosis process, adding flocculant, the effluent pH value control in 8~9 the removal of lead, zinc and other heavy metals wastewater reuse. The project started construction in March 2010. The annual output of 100 thousand tons of zinc smelting technological expansion project is completed, the total annual water consumption is 2755.8 * 104m3, the amount of fresh water is 31.082 * 104m3/a, the circulating water amount is 2619.309 * 104m3/a, wastewater The volume is 104.9 * 104m3/a. project put into production, according to different quality requirements, after the treatment of reclaimed water for plant production system, a day to reduce the sewage emissions 3178.13m3, wastewater recycling rate reached more than 95%, reduce the suspended solids 7.60t/a, chemical oxygen demand 9.72t/a, fluoride 0.05t/a, zinc 0.12t/a, Pb 0.03t/a, CD 0.01t/a, copper 0.01t/a arsenic, the emissions of 0.001t/a. The implementation of the project, into recycling wastewater for zinc zinc Chenzhou zincind annual savings of fresh water consumption of up to 1 million 49 thousand M3 (according to the year 330 days), to reduce the pollution of surface water heavy metal wastewater.

【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X758

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