Method for preparing perchlorate by electrolysis of chlorate

Abstract

The invention discloses a method to prepare perchlorate by electrolyzation. Make the electrobaths is greater than or equal to 3 in series become a group and arrange according to graded position difference, make the electrolyte flow from the high-position electrobath to the highest-position one, after electrolyzed, overflow into next one for electrolyzation, then overflow into next one, and electrolyzed in the final one to obtain the finished electrolyte, and control the conversion within 65-85%, to use the finished electrolyte to produce perchlorate product. It improves the current efficiency by above 15%, each ton of perchlorate can reduce electric consumption by 800kw.h, and the output of the perchlorate can be raised by 15% above.

Description

Technical field: [0001] The invention relates to a method for preparing perchlorate by electrolysis of chlorate. Background technique: [0002] The existing method for preparing perchlorate by chlorate electrolysis includes in a saturated solution of chlorate, controlling the pH value to 4-8, and controlling the electrolysis temperature to be below 80°C, using a titanium-based lead dioxide electrode or The ceramic-based lead dioxide electrode or platinum electrode is used as the anode, and the stainless steel electrode is used as the cathode for electrolysis, and the electrolytic solution obtained through electrolysis is used to produce perchlorate products. The electrolysis methods include single-cell continuous electrolysis and multi-cell cycle electrolysis. Single-cell continuous electrolysis has low chlorate concentration and low current efficiency in the electrolytic cell, and each electrolytic cell is controlled separately, so there are many control points and multi-ce...

AI Technical Summary

Problems solved by technology

The electrolysis methods include single-cell continuous electrolysis and multi-cell cycle electrolysis. Single-cell continuous electrolysis has low chlorate concentration and low current efficiency in the electrolytic cell, and each electrolytic cell is controlled separately, so there are many control points and multi-cell cycle. Electrolysis is intermittent production and cannot be carried out continuously. The production cycle is long, and the general production cycle is more than 240 hours.

A common problem that these two kinds of methods exist is that the current efficiency is low, the power consumption is high, and the product cost is high. This is because the conversion rate of sodium chlorate in the electrolysis process must meet certain requirements, usually more than 85%, and generally controlled at 95%. %, but because the efficiency of the current decreases with the concentration of sodium chlorate, the current efficiency is less than 40% in the process of increasing the conversion rate from 85% to 95%, so the general total current efficiency is only about 60%, resulting in power consumption High, this point was reported in "Inorganic Salt Industry 2001 Issue 1"