DE2251442A1 - Electrolytic detoxication of cyanide using V4A anode - and adding copper salt in small amt to prevent electrolytic dissolution of anode, for economy - Google Patents

Abstract

A continuous or stationary process is used in Cu salt is added to the electrolyte in an amt. of 50-150 (100) mg/l Cu2+; A residual content of 0.5 g/l CN' can be achieved at 65% current yield. The addn. of 400 mg/l. CuSO4.5H2O is partic pref. Salts of Ag, Au and other more noble metals are also effective, but costlier.

Description

Process for the electrochemical detoxification of cyanide-containing water Solutions In adaptation to the respective conditions are chemical, electrochemical and catalytic processes for the detoxification of solutions containing cyanide known and combinations of such processes.

The invention is based on the object that in chemical Highly resistant V4A material as material for the anodes in the electrochemical Detoxification of cyanide to end.

The subject of the invention is a \ Terfahrc-n for electrolytic Detoxification of cyanide, characterized in that VA material is used as the anode material uses approximately and the electrolyte copper salts in quantities of 50 mg Cu2 + per liter up to 150 mg Gu2 + per liter can be added.

It is particularly advantageous to add 400 mg of CuSO4.5H2O per liter.

It is extraordinarily surprising that they are so smaller by adding them Avoided electrolytic dissolution of the V4A anodes with copper salts under current flow It can be that an embodiment becomes an economical technical process is possible in which suitable anodes can be obtained in the electrolyte itself.

Of course, salts of silver, gold and others can also be used nobler metals are used for the process according to the invention, but these are more expensive than the salts of copper.

The use of magnetite as an anode material, the additive, is known from o, 2% copper or other noble metals to basic metals for electrolysis, likewise the production of cement-copper by precipitation with iron.

Surprisingly, the method according to the invention is sufficient Adhesion of the finely powdered copper to the anode material for the implementation the electrolytic detoxification achieved by the method according to the invention. That is all the more surprising, since fine powder also deposited during the electrolysis Copper goes into solution and is deposited empty and not insoluble non-conductive Ground barriers created.

The V4A anodes show when carrying out the electrolysis according to claim no weight loss whatsoever, even over long periods of time, eg not.

The proposed method can be with electrolytic oxidations Usual current yield of 65% up to a residual content of 0.1 g / l CN in the burnt-out process or in the stand procedure durengefünrt @erden. This can be used to detoxify chemical residues connected @ground.

Of course, the electrolyte can also contain amounts of copper salt more than 150 mg Cu2 + per liter are added.

Example: 22.5 l of a solution with 10 g / l CN were used in the standing process detoxified to a residual content of 180 mg / l ON. The total amount of oxidized The cyanide was thus 221 g.

Flectrolysis data: Cell voltage 2.3 V, current 100 A, duration of electrolysis 6 hours 40 minutes

Electrode spacing 27 mm This results in the detoxification of one kilogram of cyanide requires 6.8 KW of power.

393 mg of copper sulfate per liter of solution were added, which is a Concentration of approx. 100 mg / 1 Cu2 + corresponds.

Claims (2)

Claims 1. Process for the electrolytic detoxification of cyanide in a continuous process or in the standing procedure, d ad u r c h e k e n n n n n e i n e t that as anode material VA material is used and the electrolyte is copper salts in amounts of 50 mg Cu2 + per liter up to 150 mg Cu2 + per liter can be added. 2. The method according to claim 1, characterized in that the electrolyte 100 mg Cu2 + per liter can be added.