The invention discloses a process for controlling particle size of nano
calcium carbonate for
sulfur fixation by an alternating
magnetic field and relates to the technical field of technologies. The process comprises the steps: additionally arranging the alternating
magnetic field outside a reactor; enabling a
calcium hydroxide solution to flow through the alternating
magnetic field at the rate of 12m / s to 15m / s, and meanwhile, enabling a
branch trace solution to enter a
microscope observation range from a main passage of the
calcium hydroxide solution; slowly introducing CO2 gas into the
calcium hydroxide solution, controlling the flow rate of introduced CO2 gas by a flowmeter, and observing the moment when microscopic crystals appear, i.e., appropriate CO2 gas flow; and maintaining the CO2 gas flow until
crystallization is completed. According to the process for controlling the particle size of the nano
calcium carbonate for
sulfur fixation by the alternating magnetic field, disclosed by the invention, by the alternating magnetic field, the agglomeration among
calcium carbonate grains is controlled, the dimensional stability is improved, and the phase interfacial tension is lowered, so that the
sulfur fixation reaction performance of the nano
calcium carbonate is improved, the nano calcium
carbonate can have relatively good sulfur fixation capability under the condition of low use level, and thus the field of application of the nano calcium
carbonate is widened.