CS254002B1 - A method of recovering zinc from sludge recovered from the recovery of heavy fluid - Google Patents

Abstract

The solution relates to a method of obtaining zinc from sludges obtained during heavy liquor regeneration and from washing waters of leaching products. The essence of the solution consists in preparing a mash from sludges obtained during heavy liquor regeneration, filtering it through filter material using washing waters, treating the filtrate obtained by filtering the mash with an aqueous solution of sodium carbonate and separating the precipitate from the filtrate by filtration.

Description

The invention relates to a process for recovering zinc from sludge recovered from the recovery of a heavy liquid, prepared from an aqueous solution of ZnCl2 and from the rinsing waters of coal, ore or other leaching products, based on the difference in their specific gravity.

To date, zinc from sludge recovered from recovered heavy liquid, prepared from aqueous ZnCte solution and from the rinsing waters of coal, ore or other leaching products is not recovered and sludges or rinsing waters are discarded.

The disadvantage of this procedure is the loss of zinc, as well as environmental pollution.

According to the invention, the above mentioned drawback is remedied by the method of recovering zinc, which is based on the preparation of mash from sludge obtained by filtering heavy liquid through the filter material using rinsing water of wash products, further treating with 10-20% aqueous sodium carbonate solution. 2 ZnCO3. 3Zn (OH) 2 from the filtrate by filtration through filter material.

The recovery of zinc from the sludge in the recovery of the heavy liquid prepared from the aqueous ZnCl solution and the rinsing leads of the leaching products is achieved by filtering the contaminated heavy fluid through the filter material, preparing the mash from sludge. by treating the filtrate with a 10-20% aqueous sodium carbonate solution until the precipitation reaction is complete and separating the precipitate containing the precipitated zinc as 2ZnCO3. 3 Zn (OH is from the filtrate, by filtration through a filter material.

Example

An embodiment of the method of recovering zinc from sludge in the recovery of heavy liquid and of the ZnCl-containing rinsing lines of the invention consists in filtering the contaminated heavy liquid through a dense filter fabric in a filter centrifuge, 1 ^_1, the mixture is filtered through a thick filter cloth in the filter centrifuge, the precipitation of zinc in the filtrate with stirring a 10% aqueous sodium carbonate solution at 200 1 per 1000 1 of the mash and separating the precipitate containing 2 ZnCO3. 3 Ζη (ΟΗ) ζ from the filtrate, by filtration through a dense filter cloth in a filter centrifuge.

Claims (3)

Method for recovering zinc from sludges recovered from heavy liquid recovery prepared from aqueous ZnCl solution and rinsing lines of the wash products, characterized in that a mash is prepared from sludges obtained by filtering the heavy liquid through the filter material using rinsing lines of wash products with a concentration of 100-200 g. Γ ¹ , wherein the filtrate obtained by filtering the mash through the filter material is treated with a 10 to 20% aqueous solution of sodium carbonate in an amount of 50 to 200 l per 1000 l of mash to; to the end of the precipitation reaction and precipitated with precipitated zinc, in the form of 2 Z & CO 3. 3 Zn (QH) 2; separates from the filtrate; filtering through * filter material and filter cake sa. metallurgically 'sprase.