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首页> 外文期刊>Journal of Crystal Growth >Effect of impurities on crystal growth rate of ammonium pentaborate
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Effect of impurities on crystal growth rate of ammonium pentaborate

机译：杂质对五硼酸铵晶体生长速率的影响

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摘要

The effect of sodium chloride, borax and boric acid of different concentrations on the growth rate of ammonium pentaborate octahydrate crystals (APBO) was measured and was found to depend on supersaturation in a fluidized bed crystallizer. The presence of impurities in APBO solution increases the growth rate compared with growth from pure solution. It was found that the presence of sodium chloride, borax and boric acid decreases the reaction rate constant k_r, while it increases the mass-transfer coefficient, K, of APBO crystals. In pure aqueous solution, the crystal growth rate of APBO is mainly controlled by diffusion. However, both diffusion and integration steps affect the growth rate of APBO crystals in the presence of sodium chloride, borax and boric acid. The mass-transfer coefficient, K, reaction rate constant, k_r and reaction order, r were calculated from general mass-transfer equation by using genetic algorithm method making no assumption.
机译：测量了不同浓度的氯化钠，硼砂和硼酸对五硼酸八水合铵（APBO）晶体生长速率的影响，并发现其取决于流化床结晶器中的过饱和度。与纯溶液相比，APBO溶液中杂质的存在增加了生长速率。发现氯化钠，硼砂和硼酸的存在降低了反应速率常数k_r，同时增加了APBO晶体的传质系数K。在纯水溶液中，APBO的晶体生长速率主要受扩散控制。然而，在存在氯化钠，硼砂和硼酸的情况下，扩散和整合步骤都会影响APBO晶体的生长速率。传质系数K，反应速率常数k_r和反应阶数r是通过一般的传质方程式，采用遗传算法的方法，不做假设。

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