Metal sulfides on alkali earth particle substrates
The present disclosure relates to methods for producing metal sulfide disposed on particle substrates. In at least one embodiment, a method for producing an alkali earth hydroxide particle having a metal sulfide disposed thereon includes introducing an alkali earth oxide particle with a metal sulfate to form a first composition. The method includes introducing an alkali sulfide or an alkali earth sulfide with the first composition to form a second composition. The present disclosure further relates to compositions of matter having metal sulfide disposed on a particle substrate. In at least one embodiment, a composition of matter includes an alkali earth hydroxide particle. The composition of matter includes a metal sulfide disposed on the alkali earth hydroxide particle.
1 . A method for producing an alkali earth hydroxide particle and depositing a metal sulfide simultaneously thereon, comprising:
introducing an alkali sulfide or an alkali earth sulfide with a metal sulfate to form a first composition; and
introducing an alkali earth oxide particle with the first composition to form a second composition providing exothermic hydration of the alkali earth oxide particle, formation of the alkali earth hydroxide particle from the alkali earth oxide particle, deposition of the metal sulfide onto the alkali earth hydroxide particle during the alkali earth particle hydration, continuation of hydration of the alkali earth hydroxide particle after initial metal sulfide deposition, and simultaneous drying of the second composition wherein exothermic reactions, including the exothermic hydration, are sufficient to remove most free H 2 O from the second composition, and
wherein the alkali earth hydroxide particle has a median diameter less than a median diameter of the alkali earth oxide particle.
2 . The method of claim 1 , wherein the alkali earth hydroxide particle is a calcium hydroxide particle.
3 . The method of claim 1 , wherein the metal sulfide is a copper sulfide.
4 . The method of claim 1 , wherein the metal sulfate is copper sulfate.
5 . The method of claim 1 , wherein the metal sulfate comprises a plurality of metal sulfate particles having a median diameter of about 50 microns or less.