Method for recycling reagent-grade anhydrous sodium sulfate from basic cupric carbonate production waste liquid

Abstract

The invention provides a method for recycling reagent-grade anhydrous sodium sulfate from waste liquid generated in a process of producing basic cupric carbonate by using copper sulfate solution and alkali carbonate solution. The method comprises the following steps: adding a certain amount of sodium sulfide into waste liquid, and filtering out copper and other heavy metal impurities; removing excessive sulfion with a certain amount of reagent-grade hydrogen peroxide; adding a certain amount of aluminum sulfate into the liquid, stirring and heating till boiling, and adding a proper amount of activated carbon to adsorb, filter and remove phosphate; and regulating the pH value of filtered clear liquid with reagent-grade concentrated sulfuric acid, concentrating, centrifuging in hot state, eluting with hot water and drying to obtain the reagent-grade anhydrous sodium sulfate. The method for recycling the reagent-grade anhydrous sodium sulfate is simple to operate and mild in process condition, can effectively remove various impurities out of the waste liquid by few auxiliary materials and has high comprehensive recycling rate being above 95 percent, and inspection indicates that the product reaches chemical reagent analytic pure standard. According to the method, the reagent-grade anhydrous sodium sulfate can be recycled by virtue of treatment and comprehensive utilization of the waste liquid, so that the aims of saving energy and reducing emission, alleviating environment pollution and reducing production cost can be achieved.

Description

technical field [0001] The present invention relates to a kind of production method of anhydrous sodium sulfate, relate in particular to a kind of method that reclaims anhydrous sodium sulfate from basic copper carbonate production waste liquid, more specifically relate to a kind of by copper sulfate solution and alkali metal carbonate The invention discloses a method for recovering reagent-grade anhydrous sodium sulfate from waste liquid produced in the process of producing basic copper carbonate by solution. Background technique [0002] Anhydrous sodium sulfate, commonly known as Yuanmingfen, anhydrous Glauber's salt, is one of the bulk products of the inorganic salt industry. Anhydrous sodium sulfate is in the form of white uniform fine particles or powder, and is mainly used as a filler for synthetic detergents, a cooking agent in the paper industry, and a laxative in the pharmaceutical industry; the main production methods of anhydrous sodium sulfate are: vacuum evapo...

AI Technical Summary

Problems solved by technology

Anhydrous sodium sulfate is in the form of white uniform fine particles or powder, and is mainly used as a filler for synthetic detergents, a cooking agent in the paper industry, and a laxative in the pharmaceutical industry; the main production methods of anhydrous sodium sulfate are: vacuum evaporation, calcium Glauber's salt method, conversion method and rayon by-product method, some of these methods have complex process, high cost, difficult to remove some impurities, poor product color, low recovery rate, so looking for a new, simple and low-cost non-toxic Sodium sulfate water preparation method has become the focus of technical development in this field