The solubility of calcium carbonate in green liquor handling systems

IF 0.6 4区农林科学 Q4 MATERIALS SCIENCE, PAPER & WOOD

Tappi Journal Pub Date : 2019-11-01 DOI:10.32964/tj18.10.595

Alisha Giglio, V. Papangelakis, H. Tran

引用次数: 0

Abstract

The formation of hard calcite (CaCO3) scale in green liquor handling systems is a persistent problem in many kraft pulp mills. CaCO3 precipitates when its concentration in the green liquor exceeds its solubility. While the solubility of CaCO3 in water is well known, it is not so in the highly alkaline green liquor environment. A systematic study was conducted to determine the solubility of CaCO3 in green liquor as a function of temperature, total titratable alkali (TTA), causticity, and sulfidity. The results show that the solubility increases with increased temperature, increased TTA, decreased causticity, and decreased sulfidity. The new solubility data was incorporated into OLI (a thermodynamic simulation program for aqueous salt systems) to generate a series of CaCO3 solubility curves for various green liquor conditions. The results help explain how calcite scale forms in green liquor handling systems.

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碳酸钙在绿液处理系统中的溶解度

绿色白酒处理系统中硬方解石(CaCO3)垢的形成是许多硫酸盐纸浆厂长期存在的问题。当CaCO3在绿液中的浓度超过其溶解度时就会析出。虽然CaCO3在水中的溶解度是众所周知的，但在高碱性的绿液环境中却不是这样。系统地研究了CaCO3在绿液中的溶解度与温度、总可滴定碱(TTA)、腐蚀性和硫化度的关系。结果表明，随着温度的升高，溶解度增加，TTA增加，腐蚀性降低，硫化度降低。将新的溶解度数据纳入OLI(水盐系统的热力学模拟程序)中，生成一系列不同绿液条件下的CaCO3溶解度曲线。研究结果有助于解释方解石如何在绿色白酒处理系统中形成水垢。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Tappi Journal 工程技术-材料科学：纸与木材

CiteScore

1.30

自引率

16.70%

发文量

审稿时长

6-12 weeks

期刊介绍： An internationally recognized technical publication for over 60 years, TAPPI Journal (TJ) publishes the latest and most relevant research on the forest products and related industries. A stringent peer-review process and distinguished editorial board of academic and industry experts set TAPPI Journal apart as a reliable source for impactful basic and applied research and technical reviews. Available at no charge to TAPPI members, each issue of TAPPI Journal features research in pulp, paper, packaging, tissue, nonwovens, converting, bioenergy, nanotechnology or other innovative cellulosic-based products and technologies. Publishing in TAPPI Journal delivers your research to a global audience of colleagues, peers and employers.