CN114107671A - 一种贫镉液综合回用方法 - Google Patents
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- 229910052793 cadmium Inorganic materials 0.000 title claims abstract description 54
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000004064 recycling Methods 0.000 title claims abstract description 7
- 238000002386 leaching Methods 0.000 claims abstract description 41
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 39
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229910052742 iron Inorganic materials 0.000 claims abstract description 19
- 239000002893 slag Substances 0.000 claims abstract description 17
- 239000011701 zinc Substances 0.000 claims abstract description 17
- 238000000746 purification Methods 0.000 claims abstract description 14
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 14
- 239000007788 liquid Substances 0.000 claims abstract description 10
- 238000004519 manufacturing process Methods 0.000 claims abstract description 9
- 238000006243 chemical reaction Methods 0.000 claims description 13
- 239000000706 filtrate Substances 0.000 claims description 13
- 238000001914 filtration Methods 0.000 claims description 12
- PLZFHNWCKKPCMI-UHFFFAOYSA-N cadmium copper Chemical compound [Cu].[Cd] PLZFHNWCKKPCMI-UHFFFAOYSA-N 0.000 claims description 11
- 230000001502 supplementing effect Effects 0.000 claims description 10
- 230000003647 oxidation Effects 0.000 claims description 6
- 238000007254 oxidation reaction Methods 0.000 claims description 6
- 239000003513 alkali Substances 0.000 claims description 5
- 238000006460 hydrolysis reaction Methods 0.000 claims description 5
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical group [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 239000012286 potassium permanganate Substances 0.000 claims description 2
- 230000035484 reaction time Effects 0.000 claims description 2
- 229940037003 alum Drugs 0.000 abstract description 10
- 239000002253 acid Substances 0.000 abstract description 4
- 230000001376 precipitating effect Effects 0.000 abstract description 4
- 230000007306 turnover Effects 0.000 abstract description 4
- 238000003723 Smelting Methods 0.000 abstract description 3
- LWUVWAREOOAHDW-UHFFFAOYSA-N lead silver Chemical compound [Ag].[Pb] LWUVWAREOOAHDW-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052751 metal Inorganic materials 0.000 abstract description 3
- 239000002184 metal Substances 0.000 abstract description 3
- 150000002739 metals Chemical class 0.000 abstract description 3
- 238000001556 precipitation Methods 0.000 abstract description 3
- 238000011084 recovery Methods 0.000 abstract description 3
- JQJCSZOEVBFDKO-UHFFFAOYSA-N lead zinc Chemical compound [Zn].[Pb] JQJCSZOEVBFDKO-UHFFFAOYSA-N 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract 1
- 238000000926 separation method Methods 0.000 abstract 1
- 238000000151 deposition Methods 0.000 description 3
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- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000006228 supernatant Substances 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000004070 electrodeposition Methods 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 239000011790 ferrous sulphate Substances 0.000 description 1
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- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 1
- 229910000360 iron(III) sulfate Inorganic materials 0.000 description 1
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- 229910021653 sulphate ion Inorganic materials 0.000 description 1
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 description 1
- 229910000368 zinc sulfate Inorganic materials 0.000 description 1
- 239000011686 zinc sulphate Substances 0.000 description 1
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Abstract
本发明公开了一种贫镉液综合回用方法,涉及铅锌冶炼技术领域,解决现有方法固液分离效果不佳的技术问题,包括如下步骤:S1;S2;S3;贫镉液经氧化除铁直接进入净化系统一次净化工序,缩短了工艺流程,消除了贫镉液对浸出系统影响,在原有生产基础上,一段酸浸与沉矾液体周转量降低了10%,温度提高了5‑8℃,沉矾除铁能力提高了2g/l,沉矾上清铁控制在3g/l以内,铅银渣含锌降低了0.5%左右,提高了锌等有价金属的回收率的优点。
Description
技术领域
本发明涉及铅锌冶炼技术领域,更具体的是涉及一种贫镉液综合回用方法技术领域。
背景技术
正常铅锌冶炼中,贫镉液返回浸出系统,温度仅40-60℃,温度较低且返回量较大,对浸出一段酸浸、沉矾等工序温度、流量影响较大。
贫镉液无法直接回用于净化系统,主要由于贫镉液中铁含量较高,最高达到10g/l,若直接回用于净化系统,新液含铁达到300-750mg/l,远高于新液铁不超过20mg/l标准。电解工序新液中的铁在阴极反应如下:
Fe2(SO4)3+Zn=ZnSO4+2FeSO4,生成的硫酸亚铁又在阳极上被氧化成硫酸铁:
4FeSO4+2H2SO4+O2=2Fe2(SO4)3+2H2O。
这样还原、氧化反复进行,消耗电能。当铁达到100mg/l以上时,析出锌的质量将有所降低,反复氧化还原反应引起槽温持续升高,电流效率急剧下降,直流电单居高不下,间接放大电积锌过程杂质烧板特性,增加其它杂质如Co2+、Cu2+等烧板反溶机率,对电解生产造成严重影响。。
发明内容
本发明的目的在于:为了解决上述技术问题,本发明提供一种贫镉液综合回用方法。
本发明为了实现上述目的具体采用以下技术方案:
一种贫镉液综合回用方法,包括如下步骤:
S1铜镉渣矿浆通过泵输送至铜镉渣浸出搅拌槽,打开蒸汽阀门,控制浸出温度≥80℃,向浸出槽补加生产水,控制液固比4-5:1,缓慢补加浓硫酸,勤测槽内矿浆pH值,槽内矿浆终点pH值控制在2.0-2.5,反应6-8小时后过滤,浸出液镉含量大于等于10g/L,Zn2+控制在110-140g/L;
S2采用锌粉置换除去铜镉渣浸出液中的Cd2+,pH2.0-2.5,连续均匀加入锌粉,锌粉量(kg)=浸出液体积×浸出液镉含量,反应时间20-30min过滤,滤液即为贫镉液,贫镉液镉控制在4g/l以下;
S3贫镉液通过泵输送至氧化槽,采用质量分数为20-30%液碱调整酸度,终点pH控制在4.5-5.0左右,连续均匀加入质量分数为95%以上KMnO4,KMnO4加入量(kg)=贫镉液体积×贫镉液镉含量,反应50-70min,随着水解反应的进行,溶液酸度不断增高,反应过程及时调整pH至4.5-5.0,反应结束后过滤,滤渣即为铁锰渣,返焙烧回收锌,滤液铁控制在50mg/l以下,连续均匀返一段净化槽。
本发明的有益效果如下:
贫镉液经氧化除铁直接进入净化系统一次净化工序,缩短了工艺流程,消除了贫镉液对浸出系统影响,在原有生产基础上,一段酸浸与沉矾液体周转量降低了10%,温度提高了5-8℃,沉矾除铁能力提高了2g/l,沉矾上清铁控制在3g/l以内,铅银渣含锌降低了0.5%左右,提高了锌等有价金属的回收率。
附图说明
图1是本发明的工艺流程见图;
具体实施方式
为使本发明实施例的目的、技术方案和优点更加清楚,下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例是本发明一部分实施例,而不是全部的实施例。通常在此处附图中描述和示出的本发明实施例的组件可以以各种不同的配置来布置和设计。
因此,以下对在附图中提供的本发明的实施例的详细描述并非旨在限制要求保护的本发明的范围,而是仅仅表示本发明的选定实施例。基于本发明中的实施例,本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。
实施例1
如图1所示,本实施例提供。
S1铜镉渣矿浆通过泵输送至铜镉渣浸出搅拌槽,打开蒸汽阀门,控制浸出温度80℃,向浸出槽补加生产水,控制液固比4:1,缓慢补加浓硫酸,勤测槽内矿浆pH值,槽内矿浆终点pH值控制在2.0,反应6小时后过滤,浸出液镉含量为13g/L,Zn2+控制在120g/L;
S2采用锌粉置换除去铜镉渣浸出液中的Cd2+,pH2.0,连续均匀加入390kg锌粉,反应时间20min过滤,滤液即为贫镉液,贫镉液镉控制在2g/l、Fe2+含量为2.5g/l;
S3贫镉液通过泵输送至氧化槽,采用质量分数为20%液碱调整酸度,终点pH控制在4.5左右,连续均匀加入质量分数为95%KMnO470kg,反应50min。随着水解反应的进行,溶液酸度不断增高,反应过程及时调整pH至4.5,反应结束后过滤。滤渣即为铁锰渣,返焙烧回收锌,滤液铁控制在40mg/l,连续均匀返一段净化槽。
实施例2
S1铜镉渣矿浆通过泵输送至铜镉渣浸出搅拌槽,打开蒸汽阀门,控制浸出温度85℃,向浸出槽补加生产水,控制液固比4.5:1,缓慢补加浓硫酸,勤测槽内矿浆pH值,槽内矿浆终点pH值控制在2.3,反应7小时后过滤,浸出液镉含量为15g/L,Zn2+控制在130g/L;
S2采用锌粉置换除去铜镉渣浸出液中的Cd2+,pH2.3,连续均匀加入450kg锌粉,反应时间25min,然后过滤,滤液即为贫镉液,贫镉液镉控制在2.5g/l、Fe2+含量为2.1g/l;
S3贫镉液通过泵输送至氧化槽,采用质量分数为25%液碱调整酸度,终点pH控制在4.8左右,连续均匀加入质量分数为96%KMnO460kg,反应60min。随着水解反应的进行,溶液酸度不断增高,反应过程及时调整pH至4.8,反应结束后过滤。滤渣即为铁锰渣,返焙烧回收锌,滤液铁控制在30mg/l,连续均匀返一段净化槽。
实施例3
S1铜镉渣矿浆通过泵输送至铜镉渣浸出搅拌槽,打开蒸汽阀门,控制浸出温度88℃,向浸出槽补加生产水,控制液固比5:1,缓慢补加浓硫酸,勤测槽内矿浆pH值,槽内矿浆终点pH值控制在2.5,反应8小时后过滤,浸出液镉含量为16g/L,Zn2+控制在135g/L;
S2采用锌粉置换除去铜镉渣浸出液中的Cd2+,pH2.5,连续均匀加入480kg锌粉,反应时间30min,然后过滤,滤液即为贫镉液,贫镉液镉控制在4g/l、Fe2+含量为2.2g/l;
S3贫镉液通过泵输送至氧化槽,采用质量分数为30%液碱调整酸度,终点pH控制在5.0左右,连续均匀加入质量分数为98%KMnO462kg,反应70min。随着水解反应的进行,溶液酸度不断增高,反应过程及时调整pH至5.0,反应结束后,然后过滤。滤渣即为铁锰渣,返焙烧回收锌,滤液铁控制在45mg/l,连续均匀返一段净化槽。
自实施后,贫镉液经氧化除铁直接进入净化系统一次净化工序,缩短了工艺流程,消除了贫镉液对浸出系统影响,在原有生产基础上,一段酸浸与沉矾液体周转量降低了10%,温度提高了5-8℃,沉矾除铁能力提高了2g/l,沉矾上清铁控制在3g/l以内,铅银渣含锌降低了0.5%左右。具体见下表:
指标统计表
利用本方法,贫镉液氧化除铁过滤后,滤液不需要经过浸出系统,直接进入净化系统一次净化工序,缩短了工艺流程,缓解浸出液体周转量大的问题,提高了锌等有价金属的回收率。
Claims (1)
1.一种贫镉液综合回用方法,其特征在于,包括如下步骤:
S1铜镉渣矿浆通过泵输送至铜镉渣浸出搅拌槽,打开蒸汽阀门,控制浸出温度≥80℃,向浸出槽补加生产水,控制液固比4-5:1,缓慢补加浓硫酸,勤测槽内矿浆pH值,槽内矿浆终点pH值控制在2.0-2.5,反应6-8小时后过滤,浸出液镉含量大于等于10g/L,Zn2+控制在110-140g/L;
S2采用锌粉置换除去铜镉渣浸出液中的Cd2+,pH2.0-2.5,连续均匀加入锌粉,锌粉量(kg)=浸出液体积×浸出液镉含量,反应时间20-30min过滤,滤液即为贫镉液,贫镉液镉控制在4g/l以下;
S3贫镉液通过泵输送至氧化槽,采用质量分数为20-30%液碱调整酸度,终点pH控制在4.5-5.0左右,连续均匀加入质量分数为95%以上KMnO4,KMnO4加入量(kg)=贫镉液体积×贫镉液镉含量,反应50-70min,随着水解反应的进行,溶液酸度不断增高,反应过程及时调整pH至4.5-5.0,反应结束后过滤,滤渣即为铁锰渣,返焙烧回收锌,滤液铁控制在50mg/l以下,连续均匀返一段净化槽。
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