CN109420666A - 一种分选废旧线路板资源的方法 - Google Patents
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Abstract
本发明公开了一种分选废旧线路板资源的方法,包括以下步骤:(1)将废旧线路板装载入固定式裂解炉中进行低温裂解,裂解温度为280℃‑380℃;(2)将裂解后的废旧线路板取出,进行搓揉破碎;(3)将揉搓破碎后的废线路板进行磁选,选出杂铁和非磁性物质;(4)非磁性物质通过电涡流分选机分选出导电物质和非导电物质;(5)将电涡流分选后的非磁性物进行过筛;(6)筛分物质用水力跳汰机进行进一步分选;(7)分选物质进入卧式破碎机破碎,并通过水力摇床分离出金属混合物。本发明的有益效果:污染小,能耗低。
Description
技术领域
本发明涉及资源回收技术领域,特别是涉及一种应用了裂解工艺的分选废旧线路板资源的方法。
背景技术
随着电子工业和通信行业的发展,人们在生产生活中大量使用手机、数码相机、电脑、电视机等家用电器,相关企事业单位在生产、办公过程中的机柜和电子仪器仪表的种类和数量也越来越多。随着经济社会的发展,这些电子电器产品也在不断的更新换代。废旧线路板作为电子电器产品的重要组件,一方面含有砷、铅、镉、聚氯乙烯塑料、溴化阻燃剂等多种重金属和有机物质,存在潜在的环境污染问题;另一方面含有锡、铜、金、银等多种普通金属和贵金属,具有较高的回收利用价值。选择合适的回收方法及循环利用工艺,不但可以开发“城市矿山”资源,还可以减少处置产生的环境污染问题。现有的废旧线路板回收以手工拆解、熔锡炉脱锡和机械粉碎分选等方式为主,对环境造成了严重的污染。本发明致力于通过采用裂解工艺引入一种相对节能环保的废旧线路板资源分选处置方法。
发明内容
本发明的目的是针对现有技术中存在的技术缺陷,而提供一种分选废旧线路板资源的方法。
为实现本发明的目的所采用的技术方案是:
本发明的一种分选废旧线路板资源的方法,包括以下步骤:
(1)将废旧线路板装载入固定式裂解炉中进行低温裂解,所述低温裂解在无氧或缺氧的环境中进行,所述低温裂解的裂解温度为280℃-380℃,裂解保温时间为1h-4h;
(2)将裂解后的废旧线路板取出,进行搓揉破碎;
(3)将揉搓破碎后的废线路板进行磁选,选出杂铁和非磁性物质;
(4)将磁选后的非磁性物进行电涡流分选,分选出导电物质和非导电物质;
(5)对步骤(4)得到的导电物质进行筛分,筛网孔径6mm-20mm;
(6)将步骤(5)中的筛分后的产物进行跳汰分选;
(7)对步骤(6)中分选得到的产物使用卧式破碎机进行破碎;
(8)对步骤(7)得到的破碎物质使用水力摇床进行分选,分选出裂解渣、金属混合物和杂铝。
优选的,所述步骤(1)中裂解产生的裂解油气通过燃烧用于所述步骤(1)中的裂解炉本身的供热,裂解中产生的尾气通过环保处置后达标排放。
优选的,所述步骤(1)中的低温裂解包括以下步骤,先将废旧线路板利用装载机装入到裂解料斗中,然后推入固定式裂解炉中,关闭炉门,通入炉膛体积3-4倍的氮气进行置换出氧气,随后升温进行低温裂解。
优选的,所述步骤(4)中,通过电涡流分选机分选步骤(3)得到的非磁性物质。
优选的,所述步骤(5)中,筛网孔径为6mm-20mm。
优选的,所述步骤(6)中,用水力跳汰机分选步骤(5)得到的分选渣。
优选的,所述步骤(7)中的跳汰分选后的物质通过卧式破碎机进一步破碎,并通过水力摇床分离出金属混合物。
与现有技术相比,本发明的有益效果是:
1、通过裂解、筛分、机械搓揉、重选、电选等方法将废旧线路板中有价资源分类回收,此方法具有污染小,能耗低,资源分选回收彻底的优点。
2、本发明通过对废旧线路板的低温裂解,使废旧线路板中的胶类等有机物裂解挥发,降低了废旧线路板中基板的结构强度,从而使电子元器件及铜等金属易于从废旧线路板基板中剥离,降低了废旧线路板资源分选的难度。
3、裂解工艺本身产生的裂解油气可返回裂解炉为其自身提供能源,实现了废旧线路板的能源化利用。
4、相比于传统的焚烧或者烤锡工艺,由于裂解在无氧或缺氧环境中进行,大大降低了产生二噁英的风险。
5、相比于粉碎分选法,低温裂解工艺降低了基板的结构强度,从而更利于电子元器件和铜等金属从基板中剥离,从而降低了粉碎的能耗。
附图说明
图1所示为本发明的工艺流程图。
具体实施方式
以下结合附图图1和具体实施例对本发明作进一步详细说明。应当理解,此处所描述的具体实施例仅仅用以解释本发明,并不用于限定本发明。
实施例1
将废旧线路板500kg利用装载机装入到裂解料斗中,然后推入固定式裂解炉中,关闭炉门,通入炉膛体积约3倍的氮气进行置换出氧气,随后升温进行低温裂解,裂解温度280℃,裂解保温时间为4h,降温至80℃以下开启炉门。
废旧线路板中的环氧树脂等有机高聚物在无氧或缺氧条件下发生热分解反应。裂解中产生的裂解油气通过燃烧用于裂解炉本身的供热。尾气通过环保处置后达标排放。
待裂解完成后,取出裂解炉中的废旧线路板送往搓揉破碎机进行搓揉破碎。将揉搓破碎后的废线路板进行磁选,选出杂铁和非磁性物质,杂铁外售。将磁选后的非磁性物通过电涡流分选机分选出导电物质和非导电物质。导电物质进行过筛,筛网孔径为20mm,筛下物为分选渣,筛上物为电子元器件或大块金属。
筛下物的分选渣用水力跳汰机进行分选,分选出杂铝和非铝类物质。导电物质用水力跳汰机分选出金属混合物和杂铝,杂铝外售,非铝类物质继续进入卧式破碎机进一步破碎,并通过水力摇床分离出金属混合物等物质。分选产物表如表1所示:
表1分选产物表
名称 | 单位(kg) |
杂铁 | 24.65 |
杂铝 | 39.35 |
铜锡等混合物 | 116.00 |
裂解油气 | 80.00 |
裂解渣 | 240.00 |
产出小计 | 500.00 |
备注:因废旧线路板原料的差异,裂解分选后的产物比例会有所差异
实施例2
将废旧线路板500kg利用装载机装入到裂解料斗中,然后推入固定式裂解炉中,关闭炉门,通入炉膛体积约3倍的氮气进行置换出氧气,随后升温进行低温裂解,裂解温度330℃,裂解保温时间为2h,降温至80℃以下开启炉门。
废旧线路板中的环氧树脂等有机高聚物在无氧或缺氧条件下发生热分解反应。裂解中产生的裂解油气通过燃烧用于裂解炉本身的供热。尾气通过环保处置后达标排放。
待裂解完成后,取出裂解炉中的废旧线路板送往搓揉破碎机进行搓揉破碎。将揉搓破碎后的废线路板进行磁选,选出杂铁和非磁性物质,杂铁外售。将磁选后的非磁性物通过电涡流分选机分选出导电物质和非导电物质。导电物质进行过筛,筛网孔径为20mm,筛下物为分选渣,筛上物为电子元器件或大块金属。
筛下物的分选渣用水力跳汰机进行分选,分选出杂铝和非铝类物质。导电物质用水力跳汰机分选出金属混合物和杂铝,杂铝外售,非铝类物质继续进入卧式破碎机进一步破碎,并通过水力摇床分离出金属混合物等物质。分选产物表如表2所示:
表2分选产物表
名称 | 单位(kg) |
杂铁 | 26.05 |
杂铝 | 38.85 |
铜锡等混合物 | 110.75 |
裂解油气 | 76.00 |
裂解渣 | 248.35 |
产出小计 | 500.00 |
备注:因废旧线路板原料的差异,裂解分选后的产物比例会有所差异
实施例3
将废旧线路板500kg利用装载机装入到裂解料斗中,然后推入固定式裂解炉中,关闭炉门,通入炉膛体积约3倍的氮气进行置换出氧气,随后升温进行低温裂解,裂解温380℃,裂解保温时间为1h,降温至80℃以下开启炉门。
废旧线路板中的环氧树脂等有机高聚物在无氧或缺氧条件下发生热分解反应。裂解中产生的裂解油气通过燃烧用于裂解炉本身的供热。尾气通过环保处置后达标排放。
待裂解完成后,取出裂解炉中的废旧线路板送往搓揉破碎机进行搓揉破碎。将揉搓破碎后的废线路板进行磁选,选出杂铁和非磁性物质,杂铁外售。将磁选后的非磁性物通过电涡流分选机分选出导电物质和非导电物质。导电物质进行过筛,筛网孔径为20mm,筛下物为分选渣,筛上物为电子元器件或大块金属。
筛下物的分选渣用水力跳汰机进行分选,分选出杂铝和非铝类物质。导电物质用水力跳汰机分选出金属混合物和杂铝,杂铝外售,非铝类物质继续进入卧式破碎机进一步破碎,并通过水力摇床分离出金属混合物等物质。分选产物表如表3所示:
表3分选产物表
名称 | 单位(kg) |
杂铁 | 29.34 |
杂铝 | 41.35 |
铜锡等混合物 | 112.60 |
裂解油气 | 72.50 |
裂解渣 | 244.20 |
产出小计 | 500.00 |
备注:因废旧线路板原料的差异,裂解分选后的产物比例会有所差异
以上所述仅是本发明的优选实施方式,应当指出的是,对于本技术领域的普通技术人员来说,在不脱离本发明原理的前提下,还可以做出若干改进和润饰,这些改进和润饰也应视为本发明的保护范围。
Claims (7)
1.一种分选废旧线路板资源的方法,其特征在于,包括以下步骤:
(1)将废旧线路板装载入固定式裂解炉中进行低温裂解,所述低温裂解在无氧或缺氧的环境中进行,所述低温裂解的裂解温度为280℃-380℃,裂解保温时间为1h-4h;
(2)将裂解后的废旧线路板取出,进行搓揉破碎;
(3)将揉搓破碎后的废线路板进行磁选,选出杂铁和非磁性物质;
(4)将磁选后的非磁性物进行电涡流分选,分选出导电物质和非导电物质;
(5)对步骤(4)得到的导电物质进行筛分,筛网孔径6mm-20mm;
(6)将步骤(5)中的筛分后的产物进行跳汰分选;
(7)对步骤(6)中分选得到的产物使用卧式破碎机进行破碎;
(8)对步骤(7)得到的破碎物质使用水力摇床进行分选,分选出裂解渣、金属混合物和杂铝。
2.如权利要求1所述的方法,其特征在于:所述步骤(1)中低温裂解产生的裂解油气通过燃烧用于所述步骤(1)中的裂解炉本身的供热,裂解中产生的尾气通过环保处置后达标排放。
3.如权利要求1所述的方法,其特征在于,所述步骤(1)中的低温裂解具体包括以下步骤:先将废旧线路板利用装载机装入到裂解料斗中,然后推入固定式裂解炉中,关闭炉门,通入炉膛体积3-4倍的氮气进行置换出氧气,随后升温进行低温裂解。
4.如权利要求1所述的方法,其特征在于:所述步骤(4)中,通过电涡流分选机分选步骤(3)得到的非磁性物质。
5.如权利要求1所述的方法,其特征在于:所述步骤(5)中,筛网孔径为6mm-20mm。
6.如权利要求1所述的方法,其特征在于:所述步骤(6)中,用水力跳汰机分选步骤(5)得到的分选渣。
7.如权利要求1所述的方法,其特征在于:所述步骤(7)中的跳汰分选后的物质通过卧式破碎机进一步破碎,并通过水力摇床分离出金属混合物。
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