Method of preparing zinc ammonia carbonate solution

摘要

A method of producing a zinc-ammonia-carbonate complex solution includes heating a solution made from urea with added zinc from a zinc source in a first vessel to produce zinc and impurities dissolved in the solution and a residual; cementing the solution by adding zinc dust to form a slurry; filtering the slurry to remove a first precipitate and to produce a first filtrate; optionally heating the first filtrate to form a second precipitate in the first filtrate; and filtering the first filtrate to remove the second precipitate and to produce a second filtrate which comprises the zinc-ammonia-carbonate complex solution.