Inorganic Chemicals Industry >
Research on key technologies and mechanisms of green nano calcium carbonate production
Received date: 2024-03-20
Online published: 2025-01-24
The production process of preparing green nano calcium from calcium magnesium waste residue such as calcium carbide slag is simple，with few equipment and low investment.It belongs to the "short，flat and fast" project and new quality productivity project.The ion meters and pH meters were used to track and study the leaching reaction，and the relationship between calcium ion concentration，potential value，pH value and time changes during the leaching reaction process of fresh leaching solution and circulating mother liquor were compared.Fresh leaching solution had fast reaction speed，short time，and high leaching rate.The leaching reaction speed of the circulating mother liquor was slower，the time was longer，and the leaching rate was lower.Pre-carbonization was an extremely fast complex decomposition reaction process，with intermediate products in the form of colloids，accounting for about 20% of the total amount of calcium ions.The purpose was to provide crystal seeds for CO2 carbonization reaction.The ion meters and pH meters were used to track and study the CO2 carbonization reaction process，it was found that the initial speed was slow，the gas-liquid equilibrium of CO2 was the control step，and the ionization equilibrium of ammonia in the later stage was the control step.After stopping CO2，the carbonization process did not immediately stop，and the calcium ion concentration and potential value continued to decrease，but the pH was slightly increased.This article laid the foundation for the industrialization of green nano calcium through in-depth research on the leaching reaction of calcium carbide slag and the CO2 carbonization mechanism of calcium chloride ammonia water system.
YAN Xin , LIU Hailu , LIU Baolin , LIU Yi , LIU Yanyang . Research on key technologies and mechanisms of green nano calcium carbonate production[J]. Inorganic Chemicals Industry, 2025 , 57(1) : 71 -76 . DOI: 10.19964/j.issn.1006-4990.2024-0156
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