Method for purifying and regenerating copper element in quinolinic acid production wastewater to prepare quinolinic acid copper salt

Abstract

The invention discloses a method for purifying and regenerating a copper element in quinolinic acid production wastewater to prepare quinolinic acid copper salt and belongs to the technical field of quinolinic acid production wastewater treatment. The method comprises the following steps: (1) regulating the pH value of wastewater by using alkali, then slowly adding sodium sulfide while stirring, detecting the value by using a pH reagent, and carrying out filter pressing to collect black CuS precipitate; (2) adding the recycled CuS and water into an oxidation reaction kettle, and then executingstirring and adding a sodium chlorate water solution for oxidation reaction; (3) adding copper sulfate pentahydrate, recycled copper hydroxide, quinoline and sulfuric acid into the oxidation reactionkettle, dropwise adding the sodium chlorate water solution, heating the reaction kettle, carrying out heat preservation reaction, then executing cooling after heat preservation, executing crystallizing to separate out solid, and executing filtration to obtain a quinolinic acid copper salt. According to the method, the copper in the wastewater is reduced to below 2ppm, the utilization rate of thecopper is improved, the waste can also be changed into wealth, and the discharge problem of high-copper ion wastewater is solved.

Description

technical field

[0001] The invention belongs to the technical field of quinolinic acid oxidation wastewater treatment, and in particular relates to a method for preparing quinolinic acid copper salt by purifying and regenerating copper elements in quinolinic acid oxidation wastewater. Background technique

[0002] The production process of quinolinic acid is as follows: add copper sulfate pentahydrate, copper hydroxide (regenerated paste) and water into the reaction kettle, then slowly add concentrated sulfuric acid, raise the temperature to 55°C, keep stirring for 1h; add quinolinic acid Then slowly add sodium chlorate aqueous solution dropwise, and the reaction kettle starts to heat up. When the temperature of the reaction kettle rises to 90-95°C, keep the heat for 22 hours. A solid precipitated out. Then filter to obtain quinolinic acid copper salt and waste water; the quinolinic acid copper salt is neutralized with alkali to obtain quinolinic acid sodium salt, and at th...

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