CN109248899B - 一种判断废电路板样品中各金属品位的方法 - Google Patents
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- 239000002184 metal Substances 0.000 title claims abstract description 67
- 239000002699 waste material Substances 0.000 title claims abstract description 42
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- 238000004064 recycling Methods 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 239000010791 domestic waste Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000010944 silver (metal) Substances 0.000 description 1
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Abstract
本发明公开了一种判断废电路板样品中各金属品位的方法,选取废电路板样品,拆除废电路板样品中的大件金属,按材料性质分类收集称重,经过破碎机进行破碎,使其中的金属和非金属完全解离;通过气流分选,使金属和非金属物料分离,非金属类物料按照四分法均匀缩分样品,直接研磨;金属物料入中频炉融样;计算电路板金属品位。本发明能准确地检测出电路板废品样品中各种有价金属的含量,通过金属含量计算电路板的价值,改变了当前国内市场废电路板交易的价值评估方式,规范了贸易行为。
Description
技术领域
本发明涉及再生资源回收技术,特别涉及一种判断废电路板样品中各金属品位的方法。
背景技术
目前国内废电路板回收交易方式和价格是通过买卖双方之间的协议来达成,而这种交易的方式就是通过经验来判断废电路板价值,也就完全取决于“内行”人员的经验水平进行评估,这种交易方式,对评估废电路板价值的准确性很低。因此,回收交易的供需双方在进行废电路板的交易都存在非常大的经济风险。双方交易中由于经验水平的高低往往必然可能会造成一方利益受到损失,存在投机的贸易行为。
发明内容
为规避废电路板回收交易中价值评估风险,本发明提供一种判断回收废电路板样品中各金属品位的方法,保证回收废电路板样品的检测数据代表性,通过对废电路板样品中的金属成分检测,用检测数据来判定所回收的废电路板的价值,提高回收交易价值评估水平。
本发明的目的是这样实现的。一种判断废电路板样品中各金属品位的方法,具体步骤如下:
1)选取废电路板样品,拆除样品中的大件金属,按材料性质分类收集称重,并分别记录重量数据;
2)将拆除大件金属后的电路板样品,经过破碎机进行预破碎至颗粒状;
3)随机取步骤2)破碎后的颗粒样品称重后进行再粉碎至粒度小于3mm,使其中的金属和非金属完全解离;
4)将步骤3)粉碎后的颗粒通过气流分选,使金属和非金属物料分离,其中:金属分选纯度要求达到97%~99%,分选过程物料损耗小于3%,并对收集的金属和非金属物料分别称重,并分别记录重量数据;
5)非金属类物料在分选过程中,按照时间间隔进行取样,并均匀缩分样品,样品直接研磨过0.2mm标准筛;
6)将上述4)收集称重的金属类物料入中频炉经熔融后制铜锭、铜渣样品;
7)通过化验分析上述5)和6)步骤所得样品成分品位数据分别记录;
8)用以下计算公式计算电路板中各金属的品位:
α=(β1×γ1+β2×γ2)×γ3;
公式中:α—废电路板的金属品位;
β1和β2—分别为废电路板样品气流分选后金属和非金属物料中的金属品位;
γ1、γ2—分别为废电路板样品气流分选后的金属、非金属的重量百分比;
γ3—拆除大件金属后的电路板废品样品所占的重量百分比。
进一步,所述步骤1)大件金属为铁件或铝件,
进一步,所述步骤6)金属类物料中频熔铸的步骤如下:
1)将坩埚预热5分钟后取出,将金属物料样品(标记为m)装入已预热的坩埚中,进行熔融作业;
2)金属物料全部熔化后,关闭中频炉电源,将铜水倒入预热的模具中,待固化成铜锭后,将铜锭倒出、冷却;
3)趁热将坩埚壁上粘附的铜渣铲出,用钢丝刷清除铜锭表面铜渣,铜锭称重标记、标样;
4)铜锭钻取样屑,放入粉碎机内研磨后筛分、装袋、标样。铜渣研磨后分筛上、下装袋分别标样、称重标记。
进一步,所述步骤8)中废品样品经分选后金属物料中的金属品位β1按照以下公式计算:
β1=(mA×βA+mB×βB+mC×βC)/m;
公式中:βA、βB、βC分别表示金属类物料中频熔铸后铜锭、铜渣研磨筛上、铜渣研磨筛下三个样品的金属成分品位;
mA—金属类物料中频熔铸后清除铜渣后的铜锭重量;
mB—金属类物料中频熔铸后铜渣研磨筛上部分的铜渣重量;
mC—金属类物料中频熔铸后铜渣研磨筛下部分的铜渣重量;
m—气流分选后收集的金属物料即金属样品入炉时的重量。
进一步,所述步骤3)的颗粒样品可取平行样样品分别进行再粉碎,并分别按所述步骤4)~8)获得数组废电路板样品中的金属成分检测数据。
本发明能准确地检测出废电路板样品中各种有价金属的含量,通过金属含量计算电路板的价值,改变了当前国内市场废电路板交易的价值评估方式,规范了贸易行为。
具体实施方式
以下是本发明的一个具体实施例子,某公司采购一批彩色电视机显示器电路板废品,该电路板包含电子元器件,取样后开始本发明的方法进行样品制备,具体实施步骤如下:
1)将废电路板样品中大件的铁件和铝件先进行拆除,拆除后铁件和铝件的重量分别称重,数据见下表:
表1:废电路板拆解后的各类别重量及百分比
物料名称 | 铁 | 铝 | 电路板 | 合计 |
重量(kg) | 16 | 24 | 498 | 538 |
比例(%) | 2.97 | 4.46 | 92.57 | 100 |
2)将拆除铁件和铝件后剩余的498kg电路板经过撕碎机进行破碎至5cm×5cm左右。破碎过程中取平行样,平行样样量分别为94kg和91kg。上述平行样样品编号分别为:1-1和1-2。
3)两个平行样样品分别进行粉碎分选,粉碎过程匀速加料,两个样品粉碎分选后的数据见下表:
表2:平行样分选后金属和非金属的物料重量及比例
4)金属类物料样品制样:
4.1)将坩埚预热5分钟后取出,将金属物料样品(标记为m)装入已预热的坩埚中,进行熔融作业。
4.2)金属物料全部熔化后,关闭中频炉电源,将铜水倒入预热的模具中,待固化成铜锭后,将铜锭倒出、冷却。
4.3)立即趁热将坩埚壁上粘附的铜渣铲出,用钢丝刷清除铜锭表面铜渣,铜锭称重,标记A样,称重标记为mA。
4.4)铜锭钻取样屑,放入粉碎机内研磨后筛分、装袋,该样品标注为A样。铜渣研磨后分筛上、下装袋分别标注样品为B、C,分别称重标记为mB、mC,平行样的金属类物料Cu、Au、Ag成分和重量数据,见下表:
表3:金属类物料的金属检测数据和重量数据
4.5)金属物料中的金属品位β1按照以下公式计算:
β1=(mA×βA+mB×βB+mC×βC)/m;
公式中:βA、βB、βC分别表示A、B、C三个样品的成分品位;
mA—样品A重量;
mB—样品B重量;
mC—样品C重量;
m—金属样品入炉重量。
计算结果分别为:
1-1:金属物料中金属Cu品位β1=(13.18×59.02+0.13×58.80+0.44×25.35)/15.14=52.62
Au品位β1=(13.18×4.10+0.13×4.26+0.44×5.15)/15.14=3.76;
Ag品位β1=(13.18×684.7+0.13×704.2+0.44×342.4)/15.14=612.1;
1-2:金属物料中金属Cu品位β1=(12.08×60.62+0.036×58.14+0.381×31.16)/13.24
=56.36;
Ag品位β1=(12.08×4.22+0.036×4.20+0.381×8.51)/13.24=4.11;
Ag品位β1=(12.08×673.8+0.036×661.0+0.381×376.0)/13.24=627.4;
5)非金属样品制样:
称取200g样品放入密闭粉碎机内研磨过0.20mm标准筛,样品标注为D,分析出非金属样品中金属品位β2。
6)废电路板样品金属品位计算:
金属物料和非金属物料的金属的重量比和金属品位见下表(以铜、金、银为例):
表4:分选后金属和非金属重量百分比及金属品位数据
表中:1-1和1-2两个废电路板样品金属品位,按以下公式计算:
α=(β1×γ1+β2×γ2)×γ3;
公式中:α—废电路板的金属品位;
β1和β2—分别为分选后金属和非金属的样品品位;
γ1、γ2—分别为样品分选后的金属、非金属的重量百分比;
γ3—拆除大件金属后的电路板样品所占的重量百分比。
计算结果分别为:
1-1:Cu=(52.62%×16.11%+6.44%×77.51%)×92.57%=12.47%;
Au=(3.76×16.11%+11.05×77.51%)×92.57%=8.49(g/t);
Ag=(612.1×16.11%+306.2×77.51%)×92.57%=310.9(g/t)。
1-2:Cu=(56.36%×14.55%+7.50%×78.95%)×92.57%=13.07%;
Au=(4.11×14.55%+12.60×78.95%)×92.57%=9.76(g/t);
Ag=(627.4×14.55%+324.1×78.95%)×92.57%=321.3(g/t)。
Claims (4)
1.一种判断废电路板样品中各金属品位的方法,其特征在于,具体步骤如下:
1)选取废电路板样品,拆除样品中的大件金属,按材料性质分类收集称重,并分别记录重量数据;
2)将拆除大件金属后的电路板样品,经过破碎机进行预破碎至颗粒状;
3)随机取步骤2)破碎后的颗粒样品称重后进行再粉碎至粒度小于3mm,使其中的金属和非金属完全解离;
4)将步骤3)粉碎后的颗粒通过气流分选,使金属和非金属物料分离,其中:金属分选纯度要求达到97%~99%,分选过程物料损耗小于3%,并对收集的金属和非金属物料分别称重,并分别记录重量数据;
5)非金属类物料在分选过程中,按照时间间隔进行取样,并均匀缩分样品,样品直接研磨过0.2mm标准筛;
6)将上述4)收集称重的金属类物料入中频炉经熔融后制铜锭、铜渣样品;
7)通过化验分析上述5)和6)步骤所得样品成分品位数据分别记录;
8)用以下计算公式计算电路板中各金属的品位:
α=(β1×γ1+β2×γ2)×γ3;
公式中:α—废电路板的金属品位;
β1和β2—分别为废电路板样品气流分选后金属和非金属物料中的金属品位;
γ1、γ2—分别为废电路板样品气流分选后的金属、非金属的重量百分比;
γ3—拆除大件金属后的电路板废品样品所占的重量百分比;
分选后金属物料中的金属品位β1按照以下公式计算:
β1=(mA×βA+mB×βB+mC×βC)/m;
公式中:βA、βB、βC分别表示金属类物料中频熔铸后铜锭、铜渣研磨筛上、铜渣研磨筛下三个样品的金属成分品位;
mA—金属类物料中频熔铸后清除铜渣后的铜锭重量;
mB—金属类物料中频熔铸后铜渣研磨筛上部分的铜渣重量;
mC—金属类物料中频熔铸后铜渣研磨筛下部分的铜渣重量;
m—气流分选后收集的金属物料即金属样品入炉时的重量。
2.根据权利要求1所述的判断废电路板样品中各金属品位的方法,其特征在于:所述大件金属为铁件或铝件。
3.根据权利要求1所述的判断废电路板样品中各金属品位的方法,其特征在于:所述步骤6)金属类物料中频熔铸的步骤如下:
1)将坩埚预热5分钟后取出,将金属物料样品标记为m并装入已预热的坩埚中,进行熔融作业;
2)金属物料全部熔化后,关闭中频炉电源,将铜水倒入预热的模具中,待固化成铜锭后,将铜锭倒出、冷却;
3)趁热将坩埚壁上粘附的铜渣铲出,用钢丝刷清除铜锭表面铜渣,铜锭称重标记、标样;
4)铜锭钻取样屑,放入粉碎机内研磨后筛分、装袋、标样;铜渣研磨后分筛上、下装袋分别标样、称重标记。
4.根据权利要求1所述的判断废电路板样品中各金属品位的方法,其特征在于:所述步骤3)的颗粒样品可取平行样样品分别进行再粉碎,并分别按所述步骤4)~8)获得数组废电路板样品中的金属成分检测数据。
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