CN85109534B - 盐卤石灰沉淀除铅法 - Google Patents
盐卤石灰沉淀除铅法 Download PDFInfo
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Abstract
一种除去盐卤中所含铅的方法。以石灰为主沉淀剂,其添加量使盐卤的pH值上升到8-10,可以添加镁盐或絮凝剂。在常温下经加入沉淀剂、搅拌、澄清、过滤将铅除去。净化的盐卤含铅量可小于10-4千克/立方米。本法操作容易,设备简单,除铅率高,成本低,无二次污染。
Description
本发明涉及除去盐卤中所含铅的方法。
某些氯化钠型盐矿,因特殊的地质因素,使用该矿石溶解制取的盐卤含有10-3千克/立方米左右的铅。用该盐卤制取的食盐含铅2~6PPM,超过了中华人民共和国GB2721-81食盐卫生标准和GB5461-85食盐标准允许的含铅量。已公知的盐卤除铅方法-是《关于磨黑盐矿食盐含铅问题工作小结》记载的添加碳酸钠,使铅呈碳酸铅沉淀除去,虽效果较好,但耗用碳酸钠较多,成本过高。二是《离子交换法卤水除铅中间试验技术鉴定证书》(云轻科研字82002号)记载的“离子交换法”,可使盐卤含铅降低到3×10-4千克/立方米以下,但成本较高,投资过大。经专利文献检索,未发现其它盐卤除铅方法。
本发明的目的,是提供一种除铅率高、成本低、无二次污染的盐卤除铅方法,以使用净化后的盐卤制取的食盐含铅量低于1PPM,符合国家食盐标准。
本发明的要点是以氧化钙或氢氧化钙为主沉淀剂,使铅呈氢氧化铅与氢氧化镁一起产生共沉淀,经澄清、过滤将盐卤中的铅除去,具体做法是:在常温下将计量的含镁离子大于0.15千克/立方米的含铅盐卤引入快速澄清器,添加计量的氧化钙或氢氧化钙,其添加量使盐卤的PH值上升到8~10,经搅拌均匀,维持作用1~3分钟,经快速澄清,流入澄清池,最后经过滤得净化盐卤。所用的氢氧化钙最好是浓度为10~40%体积重量百分比的石灰乳,其添加量由除铅效果选定。盐卤中一般含有足量的镁离子,本发明只需向盐卤中添加氧化钙或氢氧化钙即可实现。若盐卤中含镁离子小于0.15千克/立方米,则可添加镁盐,如氯化镁、硫酸镁,也可添加氢氧化镁或氧化镁,使盐卤含镁离子大于0.15千克/立方米。也可添加絮凝剂如碱式氯化铝、明矾、氯化铁。
本发明操作容易,设备简单,除铅率高,净化的盐卤含铅量可小于10-4千克/立方米;所用的石灰价廉而来源广,安全无毒,因而成本低,无二次污染。
本发明用于含铅1.02×10-3千克/立方米、含镁离子2.17千克/立方米的10-3立方米盐卤,添加石灰乳1.25×10-6立方米,搅拌1.5分钟,静置澄清1小时,过滤,净化盐卤含铅5×10-5千克/立方米。
Claims (2)
1、一种除去盐卤中所含铅的方法,在常温下经添加沉淀剂、搅拌澄清、过滤等工序,其特征是:在镁离子含量不小于0.15千克/立方米的盐卤中,以氧化钙或氢氧化钙为主沉淀剂,其添加量使盐卤的pH值上升到8-10。
2、按权利要求1所述的方法,其特征是石灰乳的浓度为10~40%体积重量百分比。
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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CN85109534A CN85109534B (zh) | 1985-12-31 | 1985-12-31 | 盐卤石灰沉淀除铅法 |
Applications Claiming Priority (1)
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CN85109534A CN85109534B (zh) | 1985-12-31 | 1985-12-31 | 盐卤石灰沉淀除铅法 |
Publications (2)
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CN85109534A CN85109534A (zh) | 1986-10-08 |
CN85109534B true CN85109534B (zh) | 1988-03-09 |
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CN85109534A Expired CN85109534B (zh) | 1985-12-31 | 1985-12-31 | 盐卤石灰沉淀除铅法 |
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Families Citing this family (1)
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JPH10292358A (ja) * | 1997-04-16 | 1998-11-04 | Ishikawa Giken Rubber Kk | 油分の回収方法 |
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1985
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