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Ion exchanger for winning metals of value

a technology of metal exchanger and metal, which is applied in the direction of ion exchanger, process efficiency improvement, chemistry apparatus and processes, etc., can solve the problems of high cost of filtration media, large amount of water required, and large amount of water required, and achieves small mixing zones, small water volume, and high adsorption rate

Inactive Publication Date: 2009-01-22
LANXESS DEUTDCHLAND GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0028]Compared to the ion exchangers used in the prior art, the monodisperse, macroporous, intermediate base or strong base anion exchangers of type I or type II to be used according to the invention surprisingly display significantly higher adsorption rates for the metals of value, in particular for uranium, low pressure drops, have small mixing zones and require significantly smaller amounts of water.

Problems solved by technology

Because of the small size of the particles and the large amount of rock, a classic filtration of the particles from the aqueous phase on filters is very costly.
Large amounts of water are required and these are very expensive since many mines are located in regions in which water is scarce (deserts).
In addition, it is often necessary to use filtration media which are expensive and pollute the environment to achieve better removal of the particles.
In hydrometallurgical plants and mines which are operated in large numbers worldwide for the winning of materials of value such as gold, silver, nickel, cobalt, zinc and other metals of value, the process steps of filtration and clarification account for a large proportion of the capital cost of the plant and the ongoing operating expenses.
A disadvantage of the ion exchanger used in the prior art for the winning of uranium and also those for the winning of cobalt or nickel is the nonuniform loading of the ion exchanger with uranyl ions, which leads to considerable losses.
Due to the ion exchangers used, the separation of the laden ion exchanger beads from the slurry via a screen results in further product losses because part of the beads is lost through the sieve because of their small diameter.
Furthermore, the washing out of fine ore particles remaining from the digestion process from the fine beads is very time consuming and requires large amounts of water.
Finally, the ion exchangers to be used according to the prior art cause high pressure drops and the nonuniform loading of the ion exchanger beads result in broad mixing zones in the eluates in the elution of the metal of value from the beads, which are disadvantageous for further uranium winning.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0051]a) Preparation of the monodisperse, macroporous bead polymer based on styrene, divinylbenzene and ethylstyrene

[0052]3000 g of deionized water were placed in a 10 l glass reactor and a solution of 10 g of gelatin, 16 g of disodium hydrogenphosphate dodecahydrate and 0.73 g of resorcinol in 320 g of deionized water was added and mixed in. The temperature of the mixture was brought to 25° C. A mixture of 3200 g of microencapsulated monomer droplets having a narrow particle size distribution and comprising 3.6% by weight of divinylbenzene and 0.9% by weight of ethylstyrene (used as commercial isomer mixture of divinylbenzene and ethylstyrene containing 80% of divinylbenzene), 0.5% by weight of dibenzoyl peroxide, 56.2% by weight of styrene and 38.8% by weight of isododecane (industrial isomer mixture having a high proportion of pentamethyl-heptane) was subsequently added while stirring, with the microcapsule comprising a formaldehyde-cured complex coacervate of gelatin and a copol...

example 2

[0074]Preparation of a monodisperse intermediate base macroporous anion exchanger having dimethylaminomethyl groups and trimethylaminomethyl groups=type I

[0075]1220 ml of bead polymer bearing dimethylaminomethyl groups from Example 1d), 1342 ml of deionized water and 30.8 g of chloromethane were placed in a reaction vessel at room temperature. The mixture was heated to 40° C. and stirred at this temperature for 6 hours.

[0076]Yield of resin bearing dimethylaminomethyl groups and trimethylaminomethyl groups: 1670 ml

[0077]The extrapolated total yield was 2331 ml.

[0078]Of the nitrogen-containing groups of the product, 24.8% were present as trimethylaminomethyl groups and 75.2% were present as dimethylaminomethyl groups.

[0079]The utilizable capacity of the product was: 1.12 mol / litre of resin.

[0080]Stability of the resin in the original state: 98 perfect beads in 100

[0081]Stability of the resin after the rolling test: 96 perfect beads in 100

[0082]Stability of the resin after the swelling...

example 3

[0084]Preparation of a monodisperse strong base macroporous anion exchanger having hydroxyethyldimethylaminomethyl groups=type II

[0085]1230 ml of the resin having dimethylaminomethyl groups prepared as described in Example 1d) and 660 ml of deionized water were placed in a reaction vessel. 230.5 g of 2-chloroethanol were added thereto over a period of 10 minutes. The mixture was heated to 55° C. A pH of 9 was set by pumping in 20% strength by weight sodium hydroxide solution. The mixture was stirred at pH 9 for 3 hours, the pH was subsequently set to 10 by means of sodium hydroxide solution and the mixture was stirred at pH 10 for a further 4 hours. After cooling, the product was washed with deionized water in a column and 3 bed volumes of 3% strength by weight hydrochloric acid were then filtered through.

[0086]Yield: 1980 ml

[0087]The utilizable capacity of the product was: 0.70 mol / litre of resin.

[0088]Stability of the resin in the original state: 96 perfect beads in 100

[0089]Stabi...

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Abstract

The present invention relates to the use of monodisperse, macroporous anion exchangers of type I or type II in hydrometallurgical processes for winning metals of value.

Description

[0001]The present invention relates to the use of monodisperse, macroporous anion exchangers of type I or type II in hydrometallurgical processes for winning metals of value. Type I denotes resins whose adsorbing sites are quaternary ammonium groups which are substituted by alkyl groups. Type II denotes resins in which the quaternary ammonium groups have not only alkyl group(s) but at least one hydroxyalkyl group.BACKGROUND OF THE INVENTION[0002]Due to increasing industrialization in many parts of the world and globalization, the demand for numerous metals of value such as cobalt, nickel, zinc, manganese, copper, gold, silver and also uranium has increased considerably in recent years. Mining companies and producers of industrial metals are attempting to satisfy this increasing demand by means of various measures. These include improving the production processes themselves.[0003]The metals of value relevant for industrial use are present in ore-bearing rocks which are mined. The ore...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C22B60/02C22B3/42
CPCB01J41/04B01J41/043C22B60/0265C22B3/42B01J47/003B01J41/05B01J47/014Y02P10/20
Inventor ROSSONI, DUILIOKLIPPPER, REINHOLDWAGNER, RUDOLFWAMBACH, WOLFGANGSCHELHAAS, MICHAEL
Owner LANXESS DEUTDCHLAND GMBH
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