Method for preparing sodium chlorate from industrial salt

Abstract

The invention discloses a method for preparing sodium chlorate from industrial salt. The method comprises the following steps of: (1) mixing industrial salt with water to prepare industrial salt water, filtering and purifying the industrial salt water, putting industrial salt water into an electrolytic cell after processing to perform electrolysis, thereby obtaining a sodium chlorate solution; performing vacuum low-temperature continuous evaporation to obtain a mixture of sodium chlorate crystal and a sodium chlorate mother solution, and separating the sodium chlorate crystal from the sodium chlorate mother solution for the obtained mixture, adding anti-blocking substances in a separating process, feeding the separated-out sodium chlorate mother solution into a treatment slot for treatingsulfate radicals, adding a flocculating agent to stand after treatment, and performing dehydration separation after standing. A proportion of calcium chloride to barium chloride is controlled, so thathigh yield within unit time in a production and electrolysis process for sodium chlorate is realized, and power consumption of unit yield is reduced; and meanwhile, the prepared chlorate has a very good anti-blocking effect.

Description

technical field [0001] The invention belongs to the technical field of sodium chlorate preparation, in particular to a method for preparing sodium chlorate from industrial salt. Background technique [0002] Electrolysis of industrial salt is currently the main production method for preparing sodium chlorate. Due to the continuous circulation of sulfate ions in the sodium chlorate production process, the sulfate ions in industrial salt continuously enter the sodium chlorate production device, resulting in sulfuric acid in industrial brine As the concentration of root ions continues to increase, the product sulfate produced by evaporation and crystallization will exceed the standard. At the same time, affected by the salting-out effect, the dissolution of sodium chlorate in the system will decrease, which will affect the overall production process. Traditional sulfate ions usually use barium chloride The reaction produces barium sulfate, which is then filtered to remove the b...

AI Technical Summary

Problems solved by technology

[0002] Electrolysis of industrial salt is currently the main production method for preparing sodium chlorate. Due to the continuous circulation of sulfate ions in the sodium chlorate production process, the sulfate ions in industrial salt continuously enter the sodium chlorate production device, resulting in sulfuric acid in industrial brine As the concentration of root ions continues to increase, the product sulfate produced by evaporation and crystallization will exceed the standard. At the same time, affected by the salting-out effect, the dissolution of sodium chlorate in the system will decrease, which will affect the overall production process. Traditional sulfate ions usually use barium chloride The reaction produces barium sulfate, which is then filtered to remove the barium sulfate precipitate. However, after excessive barium ions enter the electrolysis system, the coating of the electrolytic cell will be affected, and there will be problems such as a decrease in oxygen evolution potential, an increase in side reactions, and an increase in power consumption.

At the same time, barium chloride is toxic and expensive, which makes the production cost higher and brings many troubles to the production of small and medium-sized enterprises.

In addition, sodium chlorate crystals have the problem of easy moisture absorption and agglomeration during long-term storage and extrusion, which brings great inconvenience to use, and there is a danger of explosion of broken pieces