1, calcium carbonate: it can be used as an additive in food industry; Commonly used in construction and paper industry; It can also be used to produce carbon dioxide in the laboratory; Verification and determination of halogen in the reaction of organic compounds.

2. Calcium gluconate: mainly used as calcium fortifier, nutrient, buffer, curing agent and chelating agent for food.

Second, the water solubility is different.

1, calcium carbonate: basically insoluble in water, soluble in hydrochloric acid.

2. Calcium gluconate: soluble in boiling water (20g/ 100ml), slightly soluble in cold water (3g/ 100ml, 20℃), insoluble in organic solvents such as ethanol or ether.

Third, the physical and chemical properties are different

1, calcium carbonate: Nano-calcium carbonate used in plastics has good affinity with resin, which can effectively increase or adjust the rigidity, toughness and bending strength of materials and improve the rheological properties of plastic processing systems.

2. Calcium gluconate: It can reduce capillary permeability and increase capillary compactness.

Extended data

Preparation technology of calcium carbonate

1. Crushing method: the white stone with calcium carbonate content greater than 90% is crushed, classified and separated by raymond mill or other high-pressure mills to obtain the finished product.

2. Wet grinding: In order to increase its fineness and increase its use, some people adopt wet grinding and add a certain amount of dispersant to improve its grinding efficiency, so that the fineness reaches 1 micron and the particle size is greater than 85%. Can be used for coating high-grade coated paper.

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