基于电石渣为原料的涂层填料用球形碳酸钙的制备研究

doi:10.19964/j.issn.1006-4990.2024-0241

Abstract

Abstract:

To prepare spherical CaCO₃ that met the requirements of coating fillers and simultaneously achieved high value-added resource utilization of solid waste carbide slag，spherical CaCO₃ was prepared using carbide slag as raw materials，ammonia as additive，and （NH₄）₂CO₃ as carbonizing agent.The effects of feeding order，reaction temperature，dropping speed，additive and reactant ratio on the morphology of CaCO₃ were studied.The results indicated that spherical CaCO₃ could be achieved under the condition of the ratio of the amount of ammonia，ammonium carbonate，and calcium chloride substances at 1.5:1.5:1，and when Ca²⁺ solution was instantly added to（NH₃）₂CO₃ solution，and the stirring speed was 1500 r/min，and the reaction temperature at 20 ℃，and react for 30 min.The obtained CaCO₃ were spherical with a particle size（D₅₀） of 2.733 μm and an aggregation index of 1.59.The particles were uniform and well dispersed with a purity of 97.67%，in which the crystal form was mainly vaterite，containing a small amount of calcite.Under the condition of using ammonia as the additive，the morphology control of spherical calcium carbonate was realized by adjusting the preparation process conditions.From the perspective of reducing raw materials cost and reducing environmental pollution，which provided reference for the future process research of preparing spherical single crystal CaCO₃ from calcium carbide slag as raw materials.

Key words: coating filler, spherical calcium carbonate, carbide slag, ammonia, ammonium carbonate

CLC Number:

O657.3

ZHANG Jinjun, GUO Linlin, MIAO Chengpeng, LI Xingyu, PANG Yaheng, YANG Rongkai, YU Yasen. Study on preparation of spherical calcium carbonate for coating fillers based on carbide slag as raw materials[J]. Inorganic Chemicals Industry, 2025, 57(2): 113-119.

Figures/Tables 10

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Study on preparation of spherical calcium carbonate for coating fillers based on carbide slag as raw materials

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