A method for producing micrometer-sized calcium carbonate spheres from eggshells.

Abstract

OCR 09WP 26 / 05 / 2569 A process for producing spherical, small-particle calcium carbonate from chicken eggshell waste, using... The chemical precipitation process involves using chicken eggshells that have been cleaned and crushed to a specific size. A small amount of material, 425 micrometers in diameter, is reacted with concentrated hydrochloric acid, 2 molar, in a 1:10 ratio. A calcium chloride solution with a concentration of 1.74 molar was obtained in grams per volume, and then used in the further reaction. Use a sodium carbonate solution with a concentration ranging from 0.70-1.74 molar and an equal volume. The mixing time is 0.5 seconds to 90 minutes, at a mixing rate of 800-1000 revolutions per minute. Then, it is passed through... The filtration, cleaning, and drying process yields calcium carbonate precipitates that are spherical in shape and have... Small particles, 6-20 micrometers in size, from eggshells can be used in industries requiring calcium carbonate. High efficiency that impacts products to increase value and commercial potential, and is applied in... Various industries have improved.

Claims

OCR 09WP 26 / 05 / 2569 1. The process of producing micrometer-sized calcium carbonate spheres from eggshells involves the following steps: Step 1. Preparing calcium chloride solution from eggshells. A. Add the washed and crushed eggshells (no larger than 425 micrometers) to the acid solution. 2 M hydrochloric acid at a ratio of 1:10 by grams to volume was used, and the precipitate was then filtered out. Removing the suspended particles will yield a calcium chloride solution. Step 2. Precipitation of calcium carbonate using a sodium carbonate solution. B. Add sodium carbonate solution to a calcium chloride solution with a concentration of 0.70-1.74 molar. A concentration of 0.70-1.74 molar in equal volume ratios. C. Stir the mixture from step 2.1 at a speed of 800-1000 rpm for 0.5 seconds to 90 minutes. d. Filter the suspended solids obtained from step 2.2 and wash it with deionized water 2-3 times. Use 20-30 milliliters at a time, then dry in an oven at 105-115 degrees Celsius for 2-3 hours. This will yield spherical calcium carbonate with particle sizes of 6-20 micrometers.

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