SU1435660A1 - Method of regeneration of iron-copper-chloride solutions - Google Patents

Abstract

The invention relates to a method for the regeneration of iron-copper solutions. The purpose of the invention is to improve the purity of the solution and cement copper. The method includes cementation of copper on iron scrap, separation of the regenerated solution from scrap at flow rates of the solution, precluding the removal of particles of cement copper from scrap, and separation of scrap from cement copper by treating it with water while mixing. 1 tab.

Description

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The invention relates to the etching of copper, in particular to the method of regenerating iron-copper chloride. solutions.

The purpose of the invention is to dilute the solution and cement copper.

Example 1. Treated pickling solution is fed to a cementing agent filled with iron scrap. The cementation process is carried out without moving the solution and scrap. As a result, the concentration of iron (II) in the solution varies from 52 g / l in the spent solution to 182 g / l, and the concentration of copper and iron (III) is understood from 52 to 0.15 g / l and from 68 g / l to traces of iron, respectively. The solution is separated from the scrap at the flow rates of the solution, which exclude the separation of copper particles from the scrap, after which they are oxidized with chlorine and again fed to the etching. The concentration of suspended copper in the regenerated solution is 0.008 g / l. Scrap, separated from the plant, is subjected to water treatment with stirring in the same cementing unit, as a result of which the copper copper is separated from the scrap. After separation, the cement copper and water are removed from the cementator. At the same time, during the treatment 1 and the water of the scrap V Cement copper is washed from iron chloride, the concentration of which when filling the cement grinder with water is 320-370 mg / l. The separated cement copper is filtered on a vacuum filter and then dried, after which 0.4 mass of Fe is produced per unit mass of dehydrated copper. Cl

Example 2. The spent pickling solution according to example 1 is fed to a cementing machine and after sedimentation of cement, copper on the scrap is separated from the scrap at a flow rate of the current, precluding the detachment of copper particles from the scrap. Scrap separated from the solution in the same cementing unit is treated with washing water of an electrolytic chromium plating process containing Cg (VI) in an amount of 65 mg / l. With the mixing of scrap and solution, iron remaining on the surface of scrap and copper cement completely restores hexavalent chromium to form CrClj. After separating the cement copper from the scrap, filtering it on a vacuum filter and drying per unit mass of dehydrated copper, 0.001 units of mass of FeCl are obtained.

From the presented examples, it can be seen that using the proposed method increases the purity of the regenerated solution, the concentration of the suspended phase of copper in which does not exceed 0.008 g / l, as well as the purity of cement copper, especially when treating scrap by washing with electrochemical chromium plating.

The amount of chromium injected into the solution when scrap is used again does not exceed 0.16 mg / l and does not affect the quality of the pickling process.

The use of the electrochemical chromium plating process for treating the scrap water not only reduces the cost of clean water, but also completely restores the neural hrrm in the waste water, which in turn simplifies the process of neutralization at the neutralization station. The etching solution regenerated by the proposed method provides an etching rate of di equal to 3.8-10 G / g min, which corresponds to its 100% regeneration. The proposed grouting time, as can be seen from the table, is 60-70 minutes.

A further increase in the cementation time does not lead to a decrease in the copper content in the solution. The suggested mixing time of scrap in water or wash water of the electrochemical chrome plating process is no more than 5 minutes. Using the proposed method allows to increase the service life of the pickling solutions.

Claims (1)

Invention Formula The method of regeneration of iron-copper chloride solutions, including the cementation of copper on the iron scrap, the separation of the regenerable solution from the scrap and the subsequent separation of the scrap from the cement copper, characterized in that, in order to increase the purity of the solution and the cement copper, the regenerated solution is separated from the scrap at speeds x solution streams excluding the separation of particles of cement copper from scrap, and the separation of scrap from cement copper is carried out by treating the scrap with water with stirring. Time grouting, min amount copper in solution g / l .20 30 40 50 60 70 22 10 3 0.5 0.15 0.15