Mercury recovery process专利检索-多效蒸馏净化污水处理水处理环境工程环境工程专利检索查询-专利查询网

Mercury recovery process

阅读：724发布：2023-10-17

专利汇可以提供Mercury recovery process专利检索，专利查询，专利分析的服务。并且A process for the recovery of mercury from aqueous solutions containing elemental mercury in finely divided or colloidal form or in the form of a soluble inorganic compound by treating the solution with a chemical reducing agent such as ferrous sulphate at a pH greater than 5, iron or steel turnings or chips, hydrazine, hydroxylamine, D-glucose and sodium borohydride with simultaneous removal of the resulting finely divided or colloidal mercury from the solution as a vapour and recovering the mercury from vapour. Methods of removing mercury as a vapour are by passing a stream of inert gas through the solution and steam distillation, which latter term includes injection of ''''live'''' steam and using the technique of single or multiple stage flash distillation under vacuum. A combination of the two methods is found most effective.，下面是Mercury recovery process专利的具体信息内容。

权利要求

1. A PROCESS FOR THE REMOVAL AND RECOVERY OF MERCURY FROM AQUEOUS SOLUTIONS CONTAINING SOLUBLE INORGANIC COMPOUND OF MERCURY AND HAVING A MERCURY CONCENTRATION NOT MORE THAN 100 MULLIGRAMS PER LITER WHICH COMPRISES TREATING SAID AQUEOUS SOLUTION WITH A CHEMICAL REDUCING AGENT SELECTED FROM THE GROUP CONSISTING OF FERROUS SULPHATE AT A PH GREATER THAN 5, HYDRAZINE, IRON OR STEEL TURNINGS OR CHIPS, HYDROXYLAMINE, DGLUSOSE AND SODIUM BOROHYDRIDE PRECIPITATE FINELY DIVIDED ELEMENTAL MERCURY, REMOVING SAID MERCURY BY APPLYING A VACUUM AND USING SINGLE STAGE OR MULTIPLE STAGE FLASH DISTILLATION, AND RECOVERING SAID MERCURY FROM THE VAPOR.

2. A process as defined in claim 1 wherein said elemental mercury is removed by passing a stream of inert gas through the mercury containing aqueous solution, applying a vacuum and using multiple or single stage flash distillation.

3. A process as defined in claim 1 wherein at least a portion of said soluble inorganic compound of mercury is formed by treating elemental mercury, organic compounds of mercury, or water-insoluble inorganic compounds of mercury with an oxidizing agent.

4. A process as defined in claim 3 wherein said oxidizing agnet is chlorine or nitric acid.

5. A process as defined in claim 1 wherein said reducing agent is sodium borohydride and the treatment with said reducing agent is carried out at a pH of 11.

6. A process as defined in claim 1 wherein any oxidizing agents, other than mercury compounds, present in the aqueous solution are first reduced with sodium sulphite or sulphur dioxide.

7. A process as defined in claim 1 wherein in the step of recovering said mercury from the vapor the vapor is condensed by contact with a cooled surface.

8. A process as defined in claim 7 wherein said mercury is separated from the condensate by passage through a bed composed of fibers of small diameter and then a gravity separator or centrifuge.

9. A process as defined in claim 1 wherein said aqueous solution being treated is depleted brine from a mercury cell chlorine process.

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