CN114408982A - 一种回收三元正极材料的系统及方法 - Google Patents
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Abstract
本发明公开了一种回收三元正极材料的系统及方法。本发明所述回收三元正极材料的系统,包括回收系统和吹气系统,料液罐依次与进料泵、过滤器和净化滤液罐连接;过滤器顶部设置有回流口,回流口与料液罐顶部相连,过滤器底部设置有滤液排出口,排出口分成两路,一路连接料液罐,一路连接净化滤液罐;进料泵采用离心式泵进行料液输送增压;气体加热器设有气体进出口和加热媒介进出口,气体出口依次与减压阀、过滤器顶部连接,加热媒介进出口与外部热源连接;还设置有与气体加热器并联的外部气体管道,外部气体管道直连至减压阀。本发明从板框压滤机滤液中回收三元正极材料,提高产品收率,同时减少滤液污水处理环节和固废排放量,提高企业经济效益。
Description
技术领域
本发明属于锂电池三元正极材料生产领域,具体涉及高镍锂电池三元正极材料生产工艺中,一种在水洗过滤工段从滤液中回收锂电三元正极材料的系统及方法。
背景技术
目前生产高镍锂电池三元正极材料,普遍采用高温固相法生产工艺,该工艺需要经过水洗工艺除去正极材料表面的碱杂质,水洗完成后的料浆再进行固液分离和烘干。其中固液分离普遍采用板框压滤机,该方式生产效率高,投资成本小,适宜大流量高含固量物料过滤。但是由于该工艺过滤精度有限,一是在过滤初期,滤饼层未形成时,部分固体物料会穿过滤布进入到滤液中;二是在滤饼形成后,部分细小颗粒也会穿过滤饼层和滤布进入到滤液。三元正极材料穿滤,一方面使三元正极材料的收率降低了大概2%,造成较大的经济损失;另一方面三元正极材料进入到滤液后,污水处理压力增大,污水处理后产生的固废增加,进而增加了生产成本。
发明内容
本发明目的在于从板框压滤机滤液中回收三元正极材料,提高产品收率,同时减少滤液污水处理环节和固废排放量,提高企业经济效益。另外该工艺增加了热气体吹干工艺,降低了回收物料的含湿率,有利于物料后期卸料及干燥。
本发明具体技术方案如下:
一种回收三元正极材料的系统,包括回收系统和吹气系统;
回收系统:由料液罐、进料泵、过滤器、净化滤液罐组成,料液罐依次与进料泵、过滤器和净化滤液罐连接;过滤器顶部设置有回流口,回流口与料液罐顶部相连,过滤器底部设置有滤液排出口,排出口分成两路,一路连接料液罐,一路连接净化滤液罐;进料泵采用离心式泵进行料液输送增压;
吹气系统:由气体加热器、减压阀组成;气体加热器设有气体进出口和加热媒介进出口,气体出口依次与减压阀、过滤器顶部连接,加热媒介进出口与外部热源连接;还设置有与气体加热器并联的外部气体管道,外部气体管道直连至减压阀。
设备布置时,过滤器底部高于料液罐和净化滤液罐顶部。
所述过滤器下方出口管道上还设置有视镜。
过滤器由储罐、格栅以及格栅上的滤布组成,滤布选用2微米至3微米过滤精度,储罐下封头使用气缸控制能够自动打开。
一种回收三元正极材料的方法,基于上述回收三元正极材料的系统,具体包括以下步骤:
在水洗过滤工段板框压滤机产生的滤液缓存放于料液罐中,通过进料泵输送进过滤器,过滤器进满滤液后,通过调节回流流量,控制过滤器内压力不超过0.3MPa;滤液在压力的作用下液相穿过滤布,形成净化滤液,通过视镜观察净化滤液浑浊度,浑浊度高的净化滤液回流至料液罐,清澈达标的净化滤液排放至净化滤液罐;滤液中的三元正极材料固体被滤布截留,留在滤布上方;
当滤布上的固体三元正极材料达到一定厚度时,净化滤液流量下降,过滤效率变差,此时停止进料,调节减压阀,控制压缩气体进入过滤器的压力不超过0.3MPa,使用气压将过滤器内的液相全部压入净化滤液罐。然后加热压缩气体,控制其温度为80℃±2,使用热气体对过滤器内的滤饼进行吹干,进一步降低滤饼含湿率。吹干完成后,自动打开过滤器下封头,将滤布上的滤饼排放至烘干装置,重新密封过滤器,开始进入下一循环。
本发明的优点主要表现为以下:
本发明能够回收水洗过滤工段板框压滤机穿滤的98%以上三元正极材料,回收率高,同时也提高了排放的净化滤液纯度。
本发明在每个循环周期中能够完全处理掉过滤器中的滤液,无剩余滤液,无回排物料,提高了设备利用率,避免了物料回排污染的风险。
本发明分开使用冷气体和热气体,即降低了生产能耗,也降低了滤饼的含湿率。
本发明使用2微米至3微米过滤精度的滤布,即保证了穿滤三元正极材料的回收率,又兼顾了过滤速率,提高生产效率。
本发明在开始过滤阶段将净化滤液回流至料液罐,当净化滤液固含量降至排放标准时再进行排放,有利于后期污水处理。
附图说明
图1为本发明设计的一种从滤液中回收三元正极材料的系统及方法工艺流程图
图中:料液罐1、进料泵2、物料回流阀3、过滤器排空阀4、过滤器5、滤布6、格栅7、下封头8、视镜9、净化滤液回流阀10、净化滤液阀11、净化滤液罐12、净化滤液罐排空阀13、冷气体阀14、热气体阀15、加热媒介进口阀16、气体加热器17、减压阀18、吹气阀19。
具体实施方式
为了使本发明的技术手段、创作特征、达成目的与功能易于明白了解,下面结合附图,进一步阐述本发明的实施方式。
一种回收三元正极材料的系统,包括回收系统和吹气系统;
回收系统:由料液罐1、进料泵2、过滤器5、净化滤液罐12和视镜9组成,料液罐5依次与进料泵2、过滤器5和净化滤液罐12连接。过滤器5顶部设置有回流口,回流口与料液罐顶部相连;过滤器底部设置有滤液排出口,排出口分成两路,一路连接料液罐5,一路连接净化滤液罐12。设备布置时,过滤器底部高于料液罐和净化滤液罐顶部。进料泵2采用离心式泵进行料液输送增压,过滤器5由储罐、格栅7以及格栅上的滤布6组成,滤布选用2微米至3微米过滤精度。储罐下封头8使用气缸控制能够自动打开。
吹气系统:由气体加热器17、减压阀18组成。气体加热器17设有气体进出口和加热媒介进出口,气体出口依次与减压阀、过滤器顶部连接,加热媒介进出口与外部热源连接。该系统同时设置有与气体加热器并联的管道系统,即外部气体管道直连至减压阀。
本发明具体使用过程如下:
第一步、过滤准备:
料液罐1中装有足够的滤液,满足一个过滤周期的用料要求。过滤器5中的滤布6已安装完成,下封头7已密封。
第二步、进料:
关闭物料回流阀3、过滤器排空阀4、吹气阀19,打开净化滤液回流阀10,启动进料泵2,将滤液输送进过滤器5里。待过滤器内压力压力升高至0.3MPa时,调节物料回流阀3开度,使过滤器内压力维持在0.3MPa。
第三步、过滤:
从出净化滤液开始计时一定时间后,通过视镜9观察净化滤液浑浊度,当净化滤液没有明显固形物后,关闭净化滤液回流阀10,打开净化滤液阀11、净化滤液罐排空阀13,将过滤出来的净化滤液排放至净化滤液罐12。进料泵2持续工作一段时间后,净化滤液量减少,此时,停止进料泵2,关闭物料回流阀3。
第四步、气压过滤:
第三步过滤结束后,过滤器5内的滤布6上方,留有滤饼和充满整个空间的滤液。打开冷气体阀14,调节减压阀18,使气体压力调节至0.3MPa,打开吹气阀19。在气压的作用下,将滤液中的液相压至净化滤液罐12,直至没有净化滤液排出,然后关闭冷气体阀14。
第五步、吹干:
依次打开加热媒介进口阀16、热气体阀15,通过调节加热媒介进口阀16控制气体温度为80℃±2,吹干一定时间后,关闭热气体阀15、加热媒介进口阀16、吹气阀19。
第六步、卸料:
打开过滤器排空阀4,释放系统压力。打开过滤器5的下封头8,将支撑格栅7上的滤布6拆卸下来,卸掉滤饼,清洗滤布6,然后重新安装好,进入下一个循环。
本发明能够回收水洗过滤工段板框压滤机穿滤的98%以上三元正极材料,回收率高,同时也提高了排放的净化滤液纯度。
本发明在每个循环周期中能够完全处理掉过滤器中的滤液,无剩余滤液,无回排物料,提高了设备利用率,避免了物料回排污染的风险。
本发明分开使用冷气体和热气体,即降低了生产能耗,也降低了滤饼的含湿率。
本发明使用2微米至3微米过滤精度的滤布,即保证了穿滤三元正极材料的回收率,又兼顾了过滤速率,提高生产效率。
本发明在开始过滤阶段将净化滤液回流至料液罐,当净化滤液固含量降至排放标准时再进行排放,有利于后期污水处理。
本发明的内容不限于实施例所列举,本领域普通技术人员通过阅读本发明说明书而对本发明技术方案采取的任何等效的变换,均为本发明的权利要求所涵盖。
Claims (5)
1.一种回收三元正极材料的系统,其特征在于,包括回收系统和吹气系统;
回收系统:由料液罐(1)、进料泵(2)、过滤器(5)、净化滤液罐(12)组成,料液罐(1)依次与进料泵(2)、过滤器(5)和净化滤液罐(12)连接;过滤器(5)顶部设置有回流口,回流口与料液罐(1)顶部相连,过滤器(5)底部设置有滤液排出口,排出口分成两路,一路连接料液罐(1),一路连接净化滤液罐(12);进料泵(2)采用离心式泵进行料液输送增压;
吹气系统:由气体加热器(17)、减压阀(18)组成;气体加热器(17)设有气体进出口和加热媒介进出口,气体出口依次与减压阀(18)、过滤器(5)顶部连接,加热媒介进出口与外部热源连接;还设置有与气体加热器(17)并联的外部气体管道,外部气体管道直连至减压阀(18)。
2.根据权利要求1所述的一种回收三元正极材料的系统,其特征在于:
设备布置时,过滤器(5)底部高于料液罐(1)和净化滤液罐(12)顶部。
3.根据权利要求2所述的一种回收三元正极材料的系统,其特征在于:
所述过滤器(5)下方出口管道上还设置有视镜(9)。
4.根据权利要求3所述的一种回收三元正极材料的系统,其特征在于:
过滤器(5)由储罐、格栅(7)以及格栅(7)上的滤布(6)组成,滤布(6)选用(2)微米至(3)微米过滤精度,储罐下封头(8)使用气缸控制能够自动打开。
5.一种回收三元正极材料的方法,基于权利要求1-4任一项所述回收三元正极材料的系统,具体包括以下步骤:
在水洗过滤工段板框压滤机产生的滤液缓存放于料液罐(1)中,通过进料泵(2)输送进过滤器(5),过滤器(5)进满滤液后,通过调节回流流量,控制过滤器(5)内压力不超过0.3MPa;滤液在压力的作用下液相穿过滤布(6),形成净化滤液,通过视镜(9)观察净化滤液浑浊度,浑浊度高的净化滤液回流至料液罐(1),清澈达标的净化滤液排放至净化滤液罐(12);滤液中的三元正极材料固体被滤布(6)截留,留在滤布(6)上方;
当滤布(6)上的固体三元正极材料达到一定厚度时,净化滤液流量下降,过滤效率变差,此时停止进料,调节减压阀(18),控制压缩气体进入过滤器(5)的压力不超过0.3MPa,使用气压将过滤器(5)内的液相全部压入净化滤液罐(12);然后加热压缩气体,控制其温度为80℃±2,使用热气体对过滤器(5)内的滤饼进行吹干,进一步降低滤饼含湿率;吹干完成后,自动打开过滤器(5)下封头(8),将滤布(6)上的滤饼排放至烘干装置,重新密封过滤器(5),开始进入下一循环。
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