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How is ammonium sulfate produced during nickel processing used?

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nickel briquettes — nickel processing Nickel briquettes.

During the processing of nickel sulfide ores, specifically when utilizing an ammonia pressure leach to recover nickel from solution, sulfur is recovered as a byproduct in the form of ammonium sulfate, $(N H_{4})_{2} S O_{4}$ .1

This ammonium sulfate is primarily used as a fertilizer for agricultural purposes.123