方解石型片状碳酸钙的制备研究
收稿日期: 2024-07-22
网络出版日期: 2024-09-03
基金资助
国家自然科学基金项目(21666006);广西重点研发计划项目(桂科AB24010217)
Study on preparation of flake-like calcite-type calcium carbonate
Received date: 2024-07-22
Online published: 2024-09-03
针对制备片状碳酸钙时间长、成本高、晶型控制难等问题，在氯化钙和碳酸氢铵的复分解反应中，加入形貌控制剂氯化锂，制备方解石型片状碳酸钙。考察反应温度、反应物浓度、碳酸氢铵滴加速率、氯化锂浓度、陈化时间等因素对碳酸钙形貌和晶型的影响。对产物进行表征，并将其应用于涂布白卡纸，探讨片状碳酸钙的生成机理。结果表明：在较佳反应条件下，当n（CaCl2）∶n（NH4HCO3）为1∶1、搅拌速率为450 r/min、反应温度为20 ℃、CaCl2和NH4HCO3浓度为0.45 mol/L、氯化锂浓度为1.250 mol/L、碳酸氢铵滴加速率为19.2 mL/min、陈化时间为48 h时，制备的方解石型片状碳酸钙厚度为2 μm、直径约为35~45 μm；氯化锂通过吸附在碳酸钙表面或进入碳酸钙间隙来抑制特定晶面的生长，促使碳酸钙形成片状结构，氯化锂滤液经适量补充后可循环再利用。将其用于涂布白卡纸，发现片状碳酸钙可以提高涂布白卡纸的白度、光泽度和平滑度。
宋谨英 , 杨爱梅 , 朱勇 , 袁爱群 , 白丽娟 , 黄增尉 . 方解石型片状碳酸钙的制备研究[J]. 无机盐工业, 2025 , 57(8) : 41 -47 . DOI: 10.19964/j.issn.1006-4990.2024-0415
In order to solve the problem of long time，high cost and difficult crystal control for the preparation of flake-like calcium carbonate，the morphology control agent of lithium chloride was added to the complex decomposition reaction of calcium chloride and ammonium bicarbonate to prepare flake-like calcite-type calcium carbonate.The effects of reaction temperature，concentration of reactants，droplet acceleration rate of ammonium bicarbonate，concentration of lithium chloride and aging time on both morphology and crystal form of calcium carbonate were investigated.The product was characterized and applied to white cardboard coating，and the formation mechanism of flake-like calcium carbonate was also discussed.The results showed that under optimal reaction conditions，when the molar ratio of n（CaCl2）∶n（NH4HCO3） was 1∶1，the stirring rate was 450 r/min，the reaction temperature was 20 ℃，the concentration of CaCl2 and NH4HCO3 were all 0.45 mol/L，the concentration of lithium chloride was 1.250 mol/L，and the drip acceleration rate of ammonium bicarbonate of 19.2 mL/min and an aging time of 48 hours，the prepared flake-like calcite-type calcite calcium carbonate had a thickness of 2 μm and a diameter of 35~45 μm.Lithium chloride can inhibit the growth of specific crystal planes by adsorption on the surface of calcium carbonate or entering the gap of calcium carbonate，and promote the growth of flake.Lithium chloride filtrate can be recycled after proper supplementation.When it was used to coat white card paper，it was found that flake calcium carbonate could improve the whiteness，gloss and smoothness of coated white card paper.
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