CS263221B1 - Means for regeneration of lead accumulators - Google Patents

Abstract

The purpose of the solution is to increase the service life of the regenerating agent. The agent is formed by an aqueous solution of peroxidic compounds of sulfur and/or hydrogen peroxide and sulfuric acid in an amount corresponding to 0.1 to 42 wt. hydrogen peroxide, preferably 5 to 36 wt. %, and 0.001 to 96 wt. % sulfuric acid, preferably 29 to 49 wt. %, based on the weight of the agent.

Description

The invention relates to a means for regenerating lead-acid accumulators.

At present, the regeneration of the battery cells is already carried out during their manufacture, in particular by avoiding the formation of passivating coatings, which in operation reduce the active surface of the electrodes. Many different reagents are used for this purpose either added to the electrolytes or added as antiaglomerating agents to the electrode material. These solutions have limited efficiency and only act as a preventive measure by retarding wear.

For cells already degraded by chemical processes during operation, two solutions are used. On the one hand, it is simple to rinse the cells and remove some soluble deposits and sludge with a stream of water and replace the degraded electrolyte with a new one. This method has very limited efficiency; for starter cells, the charging capacity can be increased by a maximum of 30 and cells that are very old or unusable for internal short circuits cannot be activated. A second method of regeneration involves the use of a commercially available desulfurizer to remove passivation layers in lead acid cell batteries. This method has not found widespread application since the preparation also damages lead plates in the cells. A method for regenerating lead-acid batteries using hydrogen peroxide is known. A drawback of this regenerant is that it undergoes partial decomposition, which is dependent on the time and temperature at which it is stored.

These deficiencies are eliminated by the means for regenerating the lead-acid accumulators according to the invention. It consists essentially of an aqueous solution of at least one of peroxide peroxide 221

- 2 sulfur compounds and / or hydrogen peroxide and sulfuric acid in an amount corresponding to a conversion of 0.1 to 42% by weight; % hydrogen peroxide, preferably 5 to 36 wt.%, and 0.001 to 96 wt. sulfuric acid, preferably 29 to 49% by weight of the composition.

The basic advantage of the composition according to the invention is that it has a significantly longer service life than the known compositions.

Another advantage in addition to the extended service life of the regeneration solution is the use of such a composition that the electrolyte in the cell after regeneration has a composition with a concentration of sulfuric acid that corresponds to the normal battery function. Regeneration can be accomplished by simply pouring the regeneration solution into the battery without having to rinse the cell after regeneration or adjust the sulfuric acid concentration to the value required for proper battery operation.

Compounds useful for the preparation of a long-life electrolyte include, for example, concentrated hydrogen peroxide solution, concentrated sulfuric acid, sulfur polyperoxide having an approximate SO3-4 composition, peroxosulfuric acid or peroxodisulfuric acid in the form of aqueous solutions.

The composition according to the invention is described in more detail below with reference to exemplary embodiments.

Example 1

The stabilizing recovery solution was prepared by mixing 3 parts by weight of an aqueous solution containing 44% sulfuric acid and 8% peroxosulfuric acid with one part of 2% hydrogen peroxide. The solution was stored at 25 ° C together with the original hydrogen peroxide solution for three months. The decomposition of the stabilized regeneration solution during this time was 8.1 times less than the control 3% hydrogen peroxide solution.

Example 2

A stock solution of sulfur polyperoxide was prepared, which was added to the solution

- 3 283 221 analysis after recalculation of 37.5 wt. sulfuric acid and

2.5 wt. hydrogen peroxide. To one part by weight of this stock solution was added one part by weight of hydrogen peroxide. The resulting regeneration solution was stored for 3 months at 25 ° C together with a control sample of 30 µg hydrogen peroxide. It showed 53-fold less decomposition than a control sample of hydrogen peroxide solution.

Example 3

A stock solution containing 0.1% w / w was prepared. % hydrogen peroxide and 0.001 wt. sulfuric acid. This regeneration solution was stored for 3 months together with Ο, φ »hydrogen peroxide solution. It exhibited 11x less degradation than the hydrogen naroxide control.

Example 4

A solution containing 36 wt. % hydrogen peroxide and 0.001 wt. sulfuric acid. This regeneration solution was stored for 3 months together with 36% hydrogen peroxide solution. It showed four times less degradation than the hydrogen peroxide control.

Claims (1)

SUBJECT OF THE INVENTION A composition for the recovery of lead-acid accumulators, characterized in that it comprises an aqueous solution of at least one of peroxide compounds of sulfur and / or hydrogen peroxide and sulfuric acid in an amount corresponding to a conversion of 0.1 to 42% by weight. % hydrogen peroxide, preferably 5 to 36 wt.%, and 0.001 to 96 wt. sulfuric acid, preferably 29 to 49% by weight of the composition. Printed by Moravian Printing Works, Center 100, Studentská tř.5, OLOMOUC Price: 2,40 Kčs