Method for extracting potassium sodium salts from m-aminophenol alkali fusion wastewater

Abstract

The invention relates to a method for extracting potassium sodium salts from m-aminophenol alkali fusion wastewater, wherein the method comprises the steps: filtering to remove solid impurities and oily substances in the wastewater, and detecting the potassium and sodium content in the wastewater; adding a fluosilicic acid solution with the content of 10-35% into a reaction bottle, slowly dropwiseadding m-aminophenol alkali fusion wastewater while stirring at the temperature of 20-50 DEG C, and after dropwise adding is finished, carrying out heat-preservation stirring reaction for 5-30 min; filtering to obtain a potassium fluosilicate crude product, adding a filter cake into water, uniformly stirring, adding potassium chloride at the temperature of 20-50 DEG C, and carrying out stirring reaction for 5-30 min; filtering, and drying a filter cake at the temperature of 100-120 DEG C to obtain a potassium fluosilicate finished product; at the temperature of 20-50 DEG C, adding fluosilicicacid with the content of 10-35% into another reaction bottle, and continuously and slowly dropwise adding wastewater mother liquor with a potassium salt extracted into the reaction bottle for stirring reaction for 5-30 min; and filtering, adding pure water into the filter cake, pulping and washing until the pH value is equal to 7, filtering, and drying the filter cake at the temperature of 100-120 DEG C to obtain sodium fluosilicate. According to the method, the potassium sodium salt in the m-aminophenol alkali fusion wastewater is sequentially extracted by utilizing fluosilicic acid, and theobtained potassium fluosilicate and sodium fluosilicate are high in purity and high in recovery rate.

Description

technical field [0001] The invention relates to a method for extracting potassium and sodium salts from m-aminophenol alkali-melted wastewater, and belongs to the technical field of industrial wastewater treatment. Background technique [0002] Recycling of waste is a social requirement to recover useful substances and energy from waste by adopting various engineering techniques and management measures to realize resource recycling and avoid waste of resources. In recent years, with the development of human society, wastes have been increasing and various resources have been wasted. The recycling of waste water and waste needs to attract people's attention. [0003] As a dye intermediate and pharmaceutical intermediate, m-aminophenol is widely used in fine chemicals such as dyes, functional dyes, medicines, and pesticides, such as black coupler ODB in thermosensitive dyes, anti-tuberculosis drugs (p-aminosalicylic acid) , fungicides (fungalamine and fluoroamide) and develop...

AI Technical Summary

Problems solved by technology

[0005] Common methods for extracting salt from wastewater such as: evaporation crystallization, ion exchange, electrodialysis, RO reverse osmosis, and electrosorption. The types of salt obtained by such methods are complex and low in purity, and it is difficult to separate and purify a single type of salt, resulting in Recovered salt has low utilization value, and has disadvantages such as low efficiency, high energy consumption, and high cost

In the actual industrial development process, high-purity potassium and sodium salts are often required. The Chinese patent application number 201710436809.2 discloses a separation system and a separation method for sodium and potassium salts. This method passes through crystallization and separation equipment, heat preservation and sedimentation equipment, cooling Crystallization equipment and centrifugal equipment process wastewater containing potassium salt and sodium salt, mainly according to the basic principles of high-temperature sodium analysis, low-temperature potassium analysis, and mother liquor circulation to obtain separated sodium salt crystals and potassium salt crystals; the application number is The Chinese patent of 201310494176.2 discloses a new method for separating potassium and sodium. This method uses t-BAMAP xylene system to extract, wash, secondary extraction and secondary washing to potassium and sodium Separation, and the resulting product has a high purity, but it is not suitable for large-scale actual industrial production processes; methods for potassium and sodium separation also include ion exchange, chromatography, etc., but such methods need to consume a large amount of expensive solvents, and the production cost is high