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首页> 外文会议>International Chemical Recovery Conference v.1; 20040606-20040610; Charleston,SC; US >Borate Autocausticizing Equilibria in Recovery Boiler Smelt
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Borate Autocausticizing Equilibria in Recovery Boiler Smelt

机译：回收锅炉冶炼中的硼酸盐自动苛化平衡

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摘要

Partial borate autocausticmng is an interesting option for eliminating bottlenecks at the recaust plant and the lime kiln of a kraft pulp mill chemical recovery process. The autocausticizing reactions may to some extent occur already in the early stages of the black liquor droplet combustion, but they can also occur in the recovery boiler smelt, mainly as a reaction between sodium carbonate and sodium inelaborate. It is of vital importance to understand the equilibria of borate compounds in the smelt to obtain optimum conditions for the autocausticizing reactions in the recovery boiler. The effect of the potassium and boron concentration in the salt mixture and CO_2 in the gas on the autocausticizing reactions in the recovery boiler smelt was studied by thermogravimetry and thermal analysis. Results show that the autocausticizing reaction is readily reversible with 1% CO_2 or higher in the gas atmosphere in pure sodium systems. Higher CO_2 and potassium concentration lead to lower autocausticizing. In pure potassium systems, the autocausticizing is low and the weight loss is irreversible. In potassium-rich systems volatilization of alkali- and/or boron-components becomes more prominent than in sodium systems.
机译：对于消除牛皮纸制浆厂化学回收过程中的废料处理厂和石灰窑中的瓶颈，部分硼酸盐自动腐蚀是一种有趣的选择。自苛化反应可能已在黑液液滴燃烧的早期阶段发生了一定程度，但它们也可能在回收锅炉冶炼中发生，主要是碳酸钠与精制钠之间的反应。了解熔炼中硼酸盐化合物的平衡以为回收锅炉中的自动碱化反应获得最佳条件至关重要。通过热重分析和热分析研究了盐混合物中钾和硼的浓度以及气体中的CO_2对回收锅炉冶炼中自苛化反应的影响。结果表明，在纯钠系统中，气体气氛中1％CO_2或更高时，自碱化反应易于逆转。较高的CO_2和钾浓度会导致较低的自动碱化。在纯钾系统中，自碱化程度低，重量损失不可逆。在富含钾的系统中，碱和/或硼组分的挥发比在钠系统中更加突出。

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