二氧化碳矿化高钙基固废制备微细碳酸钙研究进展

As an important chemical filler, ultrafine calcium carbonate is widely used in papermaking, ink, rubber, plastics and other industries. With the deepening of carbon emission reduction, the preparation of ultrafine calcium carbonate has become more and more diversified in terms of raw materials and process routes. The use of high-calcium industrial materials, such as steel slag, carbide slag, waste gypsum, etc., as a calcium source coupled with carbon dioxide to prepare ultrafine calcium carbonate has attracted more and more attention. In this paper, the research progress of CO₂ mineralization of high calcium solid waste to prepare ultrafine calcium carbonate is reviewed. The calcium oxide, calcium hydroxide, calcium sulfate and high-calcium industrial solid waste materials are considered and compared. This paper introduces the latest achievements on the preparation of ultrafine calcium carbonate via CO₂ mineralization based on different materials. Meanwhile, the large-scale application and environmental economy of the most representative technology of preparing ultrafine calcium carbonate by industrial solid waste are summarized. Based on the preliminary economic analysis, the reasons for the limitation of current scale-up applications are mainly the control of calcium carbonate crystallization, and the consumption of energy and cost. Thus, in order to better carry out large-scale industrial application, the following suggestions are proposed: firstly, to develop effective control methods for industrial applications aiming at the crystallization process of calcium carbonate based on the microscopic reaction mechanism and the characteristics of solid waste material properties; secondly, to couple the resource recovery of industrial solid waste and the synthesis of refined calcium carbonate technology to promote the development of specific process and devices; and thirdly, to carry out the life cycle environmental and economic assessment based on the development of control methods and equipment.