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

A saponification agent and saponification technology, which is applied in the field of metallurgy and chemical industry, can solve the problems of extraction agent reprocessing loss, long mixing and clarification time, and cannot be completely replaced, so as to improve mixing time, reduce production cost, and save three wastes treatment process and cost Effect

Active Publication Date: 2009-05-13
五矿(北京)稀土研究有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Add 5m to the reaction tank 3 Ammonium chloride concentration is 3mol / L solution and solid unslaked lime 550Kg, stirring reaction 1hr, prepare ammonia-calcium composite solution, chemical reaction equation is as follows:

[0041] 2NH 4 + +CaO+H 2 O=Ca 2+ +2NH 3 ·H 2 o

[0042] This reaction equation belongs to known technology, referring to "Soda Ash Engineering" (second edition), published by Chemical Industry Press in 2004. Since the ionization constant of ammonia water is small, the reaction can be carried out relatively completely. After the reaction, calcium dissolves in water in the form of ions and generates an ammonia solution with the same alkali equivalent. In the present embodiment, the alkalinity of this ammonia-calcium composite solution is 2.7mol / L, detect and adjust the ammonia-calcium composite solution NH 3 .H 2 The molar ratio of O:Ca is 1:0.5, filtered. The obtained ammonia-calcium composite clear liquid and the blank organic phase P507 (use...

Embodiment 2

[0044] Introduce the aqueous solution whose main component is ammonium nitrate into the storage tank, add 1000Kg of slaked lime, the circulation pump promotes the reaction, control the alkalinity of the ammonia-calcium composite solution after the reaction to 2.0mol / L, NH 3 .H 2 O:Ca 2+ The molar ratio is 1:3, clear naturally, take the supernatant liquid and blank organic phase (P204 and P507 are mixed by volume ratio 1:1) and stir and react in the mixing chamber for 2 minutes, complete the saponification of the organic phase, Ca 2+ Enter the organic phase, and the water phase is ammonium nitrate and returns to be the raw material for the preparation of the ammonia-calcium composite solution. The organic phase is washed with 0.1 mol / L calcium nitrate solution in the 1st to 3rd extraction tanks to remove ammonium, the washing water is added to the ammonia-calcium composite clear liquid, and the organic phase is saponified for extraction.

Embodiment 3

[0046] In the reaction tank, add rare earth chloride ammonium bicarbonate precipitation supernatant 10m 3 (The main component of this clear liquid is ammonium chloride), solid quicklime 40Kg, stirring reaction 1hr, after controlling the reaction, the alkalinity of ammonia-calcium composite solution is 0.5mol / L, adjust NH 3 .H 2 O:Ca 2+ The molar ratio is 1:0.1, filter. The supernatant and the blank organic phase naphthenic acid were stirred and reacted in the mixing chamber for 5 minutes to complete the saponification of the organic phase, Ca 2 + Enter the organic phase, and the water phase is ammonium chloride and returns to be the raw material for the preparation of the ammonia-calcium composite solution. The organic phase is saponified for extraction.

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D11/04C22B3/26
CPCY02P10/20
Inventor 廖春生
Owner 五矿(北京)稀土研究有限公司
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