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苛化温度对非木浆白泥碳酸钙微观形貌结构影响及机理研究

Impact of causticizing temperature on morphology of causticized calcium carbonate produced in wheat straw soda pulping process
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摘要 由于硅干扰,众多研究都发现,非木浆苛化所得的白泥碳酸钙(CCC)为无规则形态且难以回收利用。本研究发现,随着苛化温度降低,非木浆CCC微观形貌逐渐从无规则形态变为规则的纺锤形。进一步研究发现,随着苛化温度降低,硅酸钠与氢氧化钙的反应速率几乎不变,而碳酸钠与氢氧化钙的苛化反应速率显著下降,硅酸钠与氢氧化钙反应速率显著高于碳酸钠与氢氧化钙的反应速率,由此,可以推测,低温苛化反应时,硅酸钙(C-S-H)优先形成结晶析出,析出的C-S-H晶粒成为晶核,后续析出的碳酸钙在晶核表面生长,对已产生的C-S-H晶粒形成包裹,从而生成纺锤形CCC。 Because of high silica content in green liquor from wheat straw soda pulping, serious problem was caused on the morphology of calcium carbonate(CCC), as well as hindered the process of alkali recovery and recycling of CCC. It found that the morphology of CCC changes from amorphous to spindle like particles with the causticizing temperature decreased. Further study found that low causticizing temperature almost has no inf luence on the reaction rate between sodium silicate and calcium hydroxide, but it obviously reduces the causticizing reaction rate between sodium carbonate and calcium hydroxide. The reaction rate between sodium silicate and calcium hydroxide was significantly faster than that between sodium carbonate and calcium hydroxide with low temperature causticization. Therefore, the par ticles of calcium silicate for med preferentially in low temperature causticizing, and then calcium carbonate was formed and packaged on the surface of the particles of calcium silicate. It concluded that the impact of silicon on the shape of the CCC may be managed by low temperature causticization, and spindle-like particles of CCC was formed, which will provide a new way to remove silica from green liquor, so as to make it possible to reuse GCC more reasonably produced from the chemical recovery process form wheat straw soda pulping.
出处 《中华纸业》 CAS 2018年第2期27-30,共4页 China Pulp & Paper Industry
基金 制浆造纸工程国家重点实验室开放基金资助项目(201509) 浙江理工大学科研启动基金资助项目(14012081-Y) 化学工程与技术浙江省重中之重(一级)学科资助
关键词 白泥碳酸钙 苛化温度 形貌 硅酸根 非木碱法制浆 反应速率 causticizing calcium carbonate causticizing temperature morphology silicate nonwood soda pulping reaction rate
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