Abstract: The present invention relates to the use of monodisperse, macroporous chelating resins in the recovery of metals in hydrometallurgical processes, in particular in resin-in-pulp processes.

Abstract: The present invention relates to novel ion exchangers comprising carboxyl groups and also —(CH2)mNR1R2 groups having improved exchange kinetics and selectivity, a method for their production and also use thereof for the adsorption of metals, in particular arsenic, when these are additionally loaded with iron oxide/iron oxyhydroxide.

Abstract: The present invention relates to a process for purifying sulphuric acids, in particular metal-containing sulphuric acids, characterized in that monodisperse ion exchangers having chelating functional groups are used.

Abstract: The present invention relates to novel ion exchangers comprising carboxyl groups and also —(CH2)mNR1R2 groups having improved exchange kinetics and selectivity, a method for their production and also use thereof for the adsorption of metals, in particular arsenic, when these are additionally loaded with iron oxide/iron oxyhydroxide.

Abstract: The present invention relates to a process for preparing novel, monodisperse ion exchangers having chelating functional groups, and their use for adsorbing metal compounds, in particular, heavy metal compounds and noble metal compounds, and also for extracting alkaline-earth metals from saline solutions from alkali metal chloride electrolysis.

Abstract: The present invention relates to a process for preparing novel, monodisperse ion exchangers having chelating functional groups, and their use for adsorbing metal compounds, in particular, heavy metal compounds and noble metal compounds, and also for extracting alkaline-earth metals from saline solutions from alkali metal chloride electrolysis.

Abstract: The present invention relates to a process for preparing novel, monodisperse ion exchangers having chelating functional groups, and their use for adsorbing metal compounds, in particular, heavy metal compounds and noble metal compounds, and also for extracting alkaline-earth metals from saline solutions from alkali metal chloride electrolysis.

Abstract: The object of the present invention is a process for preparing novel heterodisperse chelating resins having chelating functional groups, and their use for adsorbing metal compounds, in particular alkaline earth metals, heavy metal compounds and precious metal compounds, and also for extracting alkaline earth metals from saline solutions derived from alkali metal chloride electrolysis, and also in hydrometallurgy.

Abstract: The present invention relates to a process for preparing novel, monodisperse crosslinked bead polymers having thiourea groups and their use for adsorbing metal compounds, in particular heavy metal compounds or noble metal compounds.

Abstract: The present invention relates to a process for preparing novel, monodisperse crosslinked bead polymers having thiourea groups and their use for adsorbing metal compounds, in particular heavy metal compounds or noble metal compounds.

Abstract: The present invention relates to binder-free molecular sieve zeolite granules of lithium zeolite A and lithium zeolite X, a process for preparing these molecular sieve zeolite granules and their use for preparing nitrogen or oxygen from air by pressure swing adsorption.

Abstract: The present invention relates to binder-free molecular sieve zeolite granules of lithium zeolite A and lithium zeolite X, a process for preparing these molecular sieve zeolite granules and their use for preparing nitrogen or oxygen from air by pressure swing adsorption.

Abstract: In the pressure swing adsorption of nitrogen from gas mixtures with less polar gas components at temperatures of between 20.degree. and 50.degree. C., wherein the gas mixture is passed through an adsorber which is filled with packings of zeolite pellets and has an inlet zone and an outlet zone, the improvement which comprises providing at least two packings in the adsorber, a packing of Li-zeolite X in the inlet zone of the adsorber and a packing of at least one of Ca-zeolite A and Ca-zeolite X in the outlet zone of the adsorber.

Abstract: An improved process for the oxygen enrichment of air by vacuum swing adsorption, pressure swing adsorption or a combination thereof, wherein the improvement comprises providing at least one packing at each of the air inlet to and air outlet from the adsorber, the packing at the air inlet side of the adsorber comprising Na-Ca zeolite X with an SiO.sub.2 /Al.sub.2 O.sub.3 ratio of 2.0 to 2.5 and with a CaO/Al.sub.2 O.sub.3 ratio of 0.4 to 0.75, the ratio being dependent upon the air inlet temperature, at an air inlet temperature of 20.degree. to 30.degree. C., the CaO/Al.sub.2 O.sub.3 ratio of the Na-Ca zeolite X at the inlet zone being 0.4 to 0.6, at an air inlet temperature of 30.degree. to 40.degree. C., the CaO/Al.sub.2 O.sub.3 ratio of the Ca zeolite X at the inlet zone being 0.55 to 0.65 and at an air inlet temperature of 40.degree. to 50.degree. C., the CaO/Al.sub.2 O.sub.3 ratio of the Na-Ca zeolite X at the inlet zone being 0.6 to 0.

Abstract: An improved method comprises electrophoretic application of enamel to a sheet steel substrate by a two layer/single stoving wherein a first or base enamel layer is applied to the sheet steel and a second white or colored enamel layer is applied to the first layer and the first layer has the following properties:(a) a coefficient of expansion below 165.times.10.sup.-7 /K at 0.degree. to 100.degree. C.,(b) a surface tension higher than 300 mN/m,(c) a transformation temperature of from 480.degree. to 520.degree. C., preferably from 490.degree. to 510.degree. C., and(d) a yield value of 15 to 30.

Abstract: A process for the electrophoretic application of self-cleaning enamel systems free form aluminium on sheet steel by the two layered/single stoving process, comprising applying a base layer in a thickness of 80 to 120 .mu.m to a steel substrate, and then applying a top coat to said base coat, said top comprising an enamel suspension having a specific conductivity adjusted to a value below 2000 .mu.S.cm.sup.-1.

Abstract: An article of manufacture useful as the base for an electronic circuit board is a substrate with an enamel layer having a heterogeneous structure containing at least two different phases obtained by applying a homogeneous, alkali-containing enamel powder to the substrate followed by heating at 850.degree. C. to 1,000.degree. C. wherein the enamel power has the composition as follows:______________________________________ Si.sub.O2 40-50% by weight Al.sub.2 O.sub.3 8-15% by weight Na.sub.2 O + K.sub.2 O 4-16% by weight CaO + BaO 25-35% by weight MgO 0-3% by weight B.sub.2 O.sub.3 0-10% by weight.