Method for preparing ammonia-calcium composite saponification agent and method for continuous saponification extracting

Abstract

The present invention relates to a method of a preparation and continuous saponification extraction of an ammonia-calcium compounded saponification agent. The method is to mix an ammonium salt solution with calcareousness to prepare for an ammonia-calcium compounded solution, which is filtrated or clarified to obtain an ammonia-calcium clarifying solution. The clarifying solution and an organic phase are continuously saponified. The loaded organic phase is countercurrent washed to doff ammonia by a calcium salt solution inside a 1 to 10 grade extraction groove. The saponified organic phase is mixed with a solution for extracting to make extraction separation and reverse extraction. The present invention uses the easily-obtained and low-cost calcareousness as the raw material to reduce the saponification cost during the course of extraction separation. The clarifying solution is adopted for saponification, which eliminates the rigorous requirement towards the raw material of the calcareousness and shortens the mixing time of a saponification reaction and reduces the loss or an aftertreatment of the organic phase, which is convenient for using during the continuous extraction separation. All calcium hydroniums and ammonium hydroniums are recycled. No ammonia-nitrogenous wastewater is produced during the courses of saponification and extraction, which can eliminate the environmental pollution from the ammonia-nitrogenous wastewater and save a plurality of disposal costs of waste water, gas and residues.

Description

technical field [0001] The invention belongs to the field of metallurgy and chemical industry, and in particular relates to a method for continuous saponification and extraction in extraction and separation hydrometallurgical processes, in particular to the preparation of an ammonia-calcium composite saponification agent and the method for continuous saponification and extraction. Background technique [0002] Liquid-liquid extraction refers to the technique of separating two or more liquid phases that are substantially immiscible with each other. It is a process of transferring the desired substance from one liquid phase to another, especially for Elements with similar chemical properties that are difficult to separate by conventional methods. Extraction separation is an important hydrometallurgical method. In the extraction process, in order to improve and stabilize the ion load and separation coefficient of the organic phase of the extractant, most of the organic phase of...

AI Technical Summary

Problems solved by technology

Dissolving solids with an acidic organic phase must be a slow cycle process, so although this method may saponify the organic phase, the existence of a large amount of solid substances requires a long time for mixing and clarification, and will inevitably lead to difficulty in phase separation and clarification time. long, the emulsification of the organic phase is serious, and the problems of reprocessing and loss of the extractant are inevitable, so this method is only suitable for batch operation in the reaction tank, not suitable for continuous operation in the mixing-clarification extraction tank

[0013] In summary, the various existing methods have their limitations and cannot completely replace the traditional methods of sodium soap and ammonia soap