Nitric Acid → Strontium nitrate

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Strontium nitrate may alternatively be obtained from celestite ore via the "black ash" process, in which celestite is reduced to strontium sulfide black ash by heating with coal. The strontium sulfide is leached from the black ash with water, reacted with soda ash to form strontium carbonate, and the separated strontium carbonate treated with aqueous nitric acid to yield strontium nitrate.

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