CN113754172A - 一种多晶硅废水处理方法 - Google Patents
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Abstract
本发明公开了一种多晶硅废水处理方法,包括以下步骤:(1)将多晶硅废水经预处理池调节后,泵入一级沉淀池进行絮凝沉淀;(2)将硅粉及碳化硅混合物进行物化处理;(3)将上清液输送至过滤器进行过滤;(4)将滤液输送至弱酸阳床除去弱酸根离子,再输送至除碳器除去二氧化碳;(5)将去除二氧化碳的滤液输送至反渗透池进行浓缩分离;(6)将浓缩液输送至二级沉淀池进行絮凝沉淀处理;(7)将絮凝沉淀后的高盐废水进行蒸发结晶处理;(8)将絮凝沉淀后的污泥混合物输送至浓缩池进行浓缩;(9)将浓缩后的泥浆输送至压滤机进行固液分离;(10)将泥浆块输送至干燥机进行干燥。本发明处理过程简单可靠,降低了生产成本,保护了生态环境。
Description
技术领域
本发明涉及多晶硅技术领域,具体涉及一种多晶硅废水处理方法。
背景技术
随着科技的进步、环保意识的提高,太阳能光伏材料的生产和使用进入了迅猛增长阶段;多晶硅作为太阳能光伏材料的重要原料,其工业生产需求也随之迅速提高。多晶硅主要采用多线切割技术,在切割过程中约50% 的硅料混进由聚乙二醇切削液和碳化硅粉磨料组成的切削液中,使得切削液中微粉的组成、粒径、硬度均不满足标准,造成切削性能下降,不能重复利用,因此在切割过程中需要不断地排出旧切削液,并不断补充新切削液,这样就产生了大量的切割废水。
目前,对于上述的多晶硅生产废水的处理,多采用混合加药、絮凝沉淀工艺先将废水中悬浮物去除,再将得到的总溶解固体含量在50000~70000mg/L的高盐废水排向园区或市政污水处理厂进行深度处理。但是,随着全民环保意识不断加强,有关废水环保排放标准也不断提高,这种处理方式需进行改进,而且这种处理方式还会带来高额的排污费用。因此,以上问题亟需解决。
发明内容
本发明要解决的技术问题是提供一种多晶硅废水处理方法,处理过程简单可靠,实现了污染物的“零”排放,降低了生产成本,保护了生态环境,具有很高的经济效益。
为解决上述技术问题,本发明采取如下技术方案:本发明的一种多晶硅废水处理方法,其创新点在于包括以下步骤:
(1)将多晶硅废水经预处理池调节废水PH值后,通过循环泵泵入一级沉淀池进行絮凝沉淀处理;
(2)将经一级沉淀池絮凝沉淀后的硅粉及碳化硅混合物进行物化处理;
(3)将经一级沉淀池絮凝沉淀后的上清液输送至过滤器进行过滤处理;
(4)将经过滤器过滤后的滤液输送至弱酸阳床中除去弱酸根离子后,再输送至除碳器中除去二氧化碳;
(5)将经除碳器去除二氧化碳后的滤液输送至反渗透池进行浓缩分离处理;
(6)将经反渗透池浓缩分离处理后的浓缩液输送至二级沉淀池进行絮凝沉淀处理;
(7)将经二级沉淀池絮凝沉淀后的高盐废水进行蒸发结晶处理;
(8)将经二级沉淀池絮凝沉淀后的污泥混合物输送至浓缩池进行浓缩处理;
(9)将经浓缩池浓缩后的泥浆输送至压滤机进行固液分离;
(10)将经压滤机压滤后的泥浆块输送至干燥机进行干燥处理。
优选的,在上述步骤(1)中,在预处理池中加入石灰乳和臭氧,将多晶硅废水的废水PH值调节为8~10。
优选的,在上述步骤(1)中,在一级沉淀池中加入混凝剂,且混凝剂采用聚合氧化铝;经一级沉淀池絮凝沉淀处理后,硅粉及碳化硅混合物沉降至一级沉淀池底部,且上清液悬浮在一级沉淀池上层。
优选的,在上述步骤(2)中,将硅粉及碳化硅混合物进行物化处理的具体流程为:
(2.1)将经一级沉淀池絮凝沉淀后的硅粉及碳化硅混合物输送至冲洗装置内,用纯水冲洗干净后,得到硅、碳化硅、铁和杂质的固体混合物;
(2.2)将冲洗后的固体混合物输送至搅拌清洗器内进行搅拌清洗,除去铁和杂质,得到硅和碳化硅的混合颗粒物;
(2.3)将搅拌清洗后的混合颗粒物输送至流体分离器进行分层分离,得到上层的硅和下层的碳化硅。
优选的,在上述步骤(2.2)中,在搅拌清洗器内加入温度为30℃~45℃、浓度为10%~30%的盐酸,并搅拌30~90min,除去铁和杂质。
优选的,在上述步骤(2.3)中,流体分离器中的液体由下向上以40m/h~60m/h的流速流动,且其采用的液体为纯水或氯化钠溶液。
优选的,在上述步骤(4)中,弱酸阳床填充弱酸型轻型树脂,且除碳器采用鼓风脱气的方式除去滤液中的二氧化碳。
优选的,在上述步骤(5)中,反渗透池的渗透压为6 MPa ~8Mpa,并将去除二氧化碳后的滤液浓缩分离为浓缩液和渗透液。
优选的,在上述步骤(6)中,在二级沉淀池中加入混凝剂,且混凝剂采用聚丙烯酰胺;经二级沉淀池絮凝沉淀处理后,污泥混合物沉降至二级沉淀池底部,且高盐废水悬浮在二级沉淀池上层。
优选的,在上述步骤(7)中,将高盐废水进行蒸发结晶处理的具体流程为:
(7.1)将经二级沉淀池絮凝沉淀后的高盐废水输送至脱气塔中,脱除不凝气;
(7.2)将脱除不凝气后的高盐废水输送至一级蒸发器进行一次蒸发浓缩,得到浓缩液;
(7.3)将一次蒸发浓缩后的浓缩液水进行预脱水后,输送至离心机分离出氯化钠盐和母液;
(7.4)将经离心机分离后的母液输送至二级蒸发器进行二次蒸发浓缩。
本发明的有益效果:本发明处理过程简单可靠,实现了污染物的“零”排放,降低了生产成本,保护了生态环境,具有很高的经济效益。
附图说明
为了更清晰地说明本发明实施例中的技术方案,下面将对实施例中所需要使用的附图简单地介绍,显而易见地,下面描述中的附图仅仅是本发明中记载的一些实施例,对于本领域普通技术人员来讲,在不付出创造性劳动的前提下,还可以根据这些附图获得其他的附图。
图1为本发明一种多晶硅废水处理方法的系统框图。
其中,1-预处理池;2-循环泵;3-一级沉淀池;4-浓缩池;5-压滤机;6-干燥机;7-过滤器;8-弱酸阳床;9-除碳器;10-二级沉淀池;11-反渗透池;12-冲洗装置;13-搅拌清洗器;14-流体分离器;15-脱气塔;16-一级蒸发器;17-离心机;18-二级蒸发器。
具体实施方式
下面将通过具体实施方式对本发明的技术方案进行清楚、完整地描述。
本发明的一种多晶硅废水处理方法,包括以下步骤:
(1)将多晶硅废水经预处理池1调节废水PH值后,通过循环泵2泵入一级沉淀池3进行絮凝沉淀处理;
在上述步骤中,在预处理池1中加入石灰乳和臭氧,将多晶硅废水的废水PH值调节为8~10,从而改善其生化特性。
在上述步骤中,在一级沉淀池3中加入混凝剂,且混凝剂采用聚合氧化铝;经一级沉淀池3絮凝沉淀处理后,硅粉及碳化硅混合物沉降至一级沉淀池3底部,且上清液悬浮在一级沉淀池3上层。
(2)将经一级沉淀池3絮凝沉淀后的硅粉及碳化硅混合物进行物化处理;
在上述步骤中,将硅粉及碳化硅混合物进行物化处理的具体流程为:
(2.1)将经一级沉淀池3絮凝沉淀后的硅粉及碳化硅混合物输送至冲洗装置12内,用纯水冲洗干净后,得到硅、碳化硅、铁和杂质的固体混合物。
(2.2)将冲洗后的固体混合物输送至搅拌清洗器13内进行搅拌清洗,除去铁和杂质,得到硅和碳化硅的混合颗粒物;
其中,在搅拌清洗器13内加入温度为30℃~45℃、浓度为10%~30%的盐酸,并搅拌30~90min,除去铁和杂质。
(2.3)将搅拌清洗后的混合颗粒物输送至流体分离器14进行分层分离,得到上层的硅和下层的碳化硅;
其中,流体分离器14中的液体由下向上以40m/h~60m/h的流速流动,且其采用的液体为纯水或氯化钠溶液;当混合颗粒物全部处于悬浮状态时,快速停止流体分离器14进水,使混合颗粒物快速沉降下来,便可分别收集上层的硅和下层的碳化硅。
(3)将经一级沉淀池3絮凝沉淀后的上清液输送至过滤器7进行过滤处理;
在上述步骤中,过滤器7可采用多介质过滤器7,来除去上清液中的悬浮杂质。
(4)将经过滤器7过滤后的滤液输送至弱酸阳床8中除去弱酸根离子后,再输送至除碳器9中除去二氧化碳;
在上述步骤中,弱酸阳床8填充弱酸型轻型树脂,以便去除滤液中的碳酸根、硅酸根、亚硫酸根等弱酸根离子;除碳器9采用鼓风脱气的方式除去滤液中的二氧化碳,以防止滤液中的钙离子、镁离子在反渗透过程中结垢。
(5)将经除碳器9去除二氧化碳后的滤液输送至反渗透池11进行浓缩分离处理;
在上述步骤中,反渗透池11的渗透压为6 MPa ~8Mpa,并将去除二氧化碳后的滤液浓缩分离为浓缩液和渗透液,渗透液可再进入反渗透池11进行反复浓缩分离处理,直至达到标准后,作为产水回收。
(6)将经反渗透池11浓缩分离处理后的浓缩液输送至二级沉淀池10进行絮凝沉淀处理;
在上述步骤中,在二级沉淀池10中加入混凝剂,且混凝剂采用聚丙烯酰胺;经二级沉淀池10絮凝沉淀处理后,污泥混合物沉降至二级沉淀池10底部,且高盐废水悬浮在二级沉淀池10上层。
(7)将经二级沉淀池10絮凝沉淀后的高盐废水进行蒸发结晶处理;
在上述步骤中,将高盐废水进行蒸发结晶处理的具体流程为:
(7.1)将经二级沉淀池10絮凝沉淀后的高盐废水输送至脱气塔15中,脱除不凝气。
(7.2)将脱除不凝气后的高盐废水输送至一级蒸发器16进行一次蒸发浓缩,得到浓缩液;
其中,一次蒸发浓缩产生的蒸汽在冷凝后可作为产水回收。
(7.3)将一次蒸发浓缩后的浓缩液水进行预脱水后,输送至离心机17分离出氯化钠盐和母液。
(7.4)将经离心机17分离后的母液输送至二级蒸发器18进行二次蒸发浓缩;
其中,二次蒸发浓缩产生的蒸汽在冷凝后可作为产水回收,而浓缩物经冷却、结晶后,可采用切片机进行切片,得到氯化钙固体以及其他杂盐。
(8)将经二级沉淀池10絮凝沉淀后的污泥混合物输送至浓缩池4进行浓缩处理,从而实现浓缩增稠。
(9)将经浓缩池4浓缩后的泥浆输送至压滤机5进行压滤,实现固液分离;
其中,压滤后得到的泥浆块中的含水量在45%左右。
(10)将经压滤机5压滤后的泥浆块输送至干燥机6进行干燥处理,使得其含水量降低至5%以下,得到干泥饼;
其中,干燥过程中产生的水蒸气进行冷凝后可作为产水回收。
本发明的有益效果:本发明处理过程简单可靠,实现了污染物的“零”排放,降低了生产成本,保护了生态环境,具有很高的经济效益。
上面所述的实施例仅仅是本发明的优选实施方式进行描述,并非对本发明的构思和范围进行限定,在不脱离本发明设计构思的前提下,本领域中普通工程技术人员对本发明的技术方案作出的各种变型和改进均应落入本发明的保护范围,本发明的请求保护的技术内容,已经全部记载在技术要求书中。
Claims (10)
1.一种多晶硅废水处理方法,其特征在于包括以下步骤:
(1)将多晶硅废水经预处理池调节废水PH值后,通过循环泵泵入一级沉淀池进行絮凝沉淀处理;
(2)将经一级沉淀池絮凝沉淀后的硅粉及碳化硅混合物进行物化处理;
(3)将经一级沉淀池絮凝沉淀后的上清液输送至过滤器进行过滤处理;
(4)将经过滤器过滤后的滤液输送至弱酸阳床中除去弱酸根离子后,再输送至除碳器中除去二氧化碳;
(5)将经除碳器去除二氧化碳后的滤液输送至反渗透池进行浓缩分离处理;
(6)将经反渗透池浓缩分离处理后的浓缩液输送至二级沉淀池进行絮凝沉淀处理;
(7)将经二级沉淀池絮凝沉淀后的高盐废水进行蒸发结晶处理;
(8)将经二级沉淀池絮凝沉淀后的污泥混合物输送至浓缩池进行浓缩处理;
(9)将经浓缩池浓缩后的泥浆输送至压滤机进行固液分离;
(10)将经压滤机压滤后的泥浆块输送至干燥机进行干燥处理。
2.根据权利要求1所述的一种多晶硅废水处理方法,其特征在于:在上述步骤(1)中,在预处理池中加入石灰乳和臭氧,将多晶硅废水的废水PH值调节为8~10。
3.根据权利要求1所述的一种多晶硅废水处理方法,其特征在于:在上述步骤(1)中,在一级沉淀池中加入混凝剂,且混凝剂采用聚合氧化铝;经一级沉淀池絮凝沉淀处理后,硅粉及碳化硅混合物沉降至一级沉淀池底部,且上清液悬浮在一级沉淀池上层。
4.根据权利要求3所述的一种多晶硅废水处理方法,其特征在于:在上述步骤(2)中,将硅粉及碳化硅混合物进行物化处理的具体流程为:
(2.1)将经一级沉淀池絮凝沉淀后的硅粉及碳化硅混合物输送至冲洗装置内,用纯水冲洗干净后,得到硅、碳化硅、铁和杂质的固体混合物;
(2.2)将冲洗后的固体混合物输送至搅拌清洗器内进行搅拌清洗,除去铁和杂质,得到硅和碳化硅的混合颗粒物;
(2.3)将搅拌清洗后的混合颗粒物输送至流体分离器进行分层分离,得到上层的硅和下层的碳化硅。
5.根据权利要求4所述的一种多晶硅废水处理方法,其特征在于:在上述步骤(2.2)中,在搅拌清洗器内加入温度为30℃~45℃、浓度为10%~30%的盐酸,并搅拌30~90min,除去铁和杂质。
6.根据权利要求4所述的一种多晶硅废水处理方法,其特征在于:在上述步骤(2.3)中,流体分离器中的液体由下向上以40m/h~60m/h的流速流动,且其采用的液体为纯水或氯化钠溶液。
7.根据权利要求1所述的一种多晶硅废水处理方法,其特征在于:在上述步骤(4)中,弱酸阳床填充弱酸型轻型树脂,且除碳器采用鼓风脱气的方式除去滤液中的二氧化碳。
8.根据权利要求1所述的一种多晶硅废水处理方法,其特征在于:在上述步骤(5)中,反渗透池的渗透压为6 MPa ~8Mpa,并将去除二氧化碳后的滤液浓缩分离为浓缩液和渗透液。
9.根据权利要求1所述的一种多晶硅废水处理方法,其特征在于:在上述步骤(6)中,在二级沉淀池中加入混凝剂,且混凝剂采用聚丙烯酰胺;经二级沉淀池絮凝沉淀处理后,污泥混合物沉降至二级沉淀池底部,且高盐废水悬浮在二级沉淀池上层。
10.根据权利要求9所述的一种多晶硅废水处理方法,其特征在于:在上述步骤(7)中,将高盐废水进行蒸发结晶处理的具体流程为:
(7.1)将经二级沉淀池絮凝沉淀后的高盐废水输送至脱气塔中,脱除不凝气;
(7.2)将脱除不凝气后的高盐废水输送至一级蒸发器进行一次蒸发浓缩,得到浓缩液;
(7.3)将一次蒸发浓缩后的浓缩液水进行预脱水后,输送至离心机分离出氯化钠盐和母液;
(7.4)将经离心机分离后的母液输送至二级蒸发器进行二次蒸发浓缩。
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