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黄原胶作为一种用途很广的生物增稠剂和发泡剂,具有抗剪切性和耐酸、耐碱和抗氧化等特点,这些特点恰好满足静态泡沫去污对增稠剂的要求。本文测量并分析了碱性体系中(Na2CO3体系)影响发泡液粘度的几种因素(搅拌速度、黄原胶浓度、碳酸钠浓度及温度);以及酸性体系中(HNO3+H3PO4体系)黄原胶浓度和发泡液放置时间对泡沫稳定性的影响;比较分析了铝片在酸性发泡液及其生成泡沫中的失重情况。试验结果表明黄原胶无论是在碱性溶液还是在酸性溶液中均具有一定的稳定性,能够满足泡沫去污的要求;其稳定性随时间推移而降低的特性有利于泡沫去污产生的二次废液的处理。黄原胶酸性发泡液能够产生稳定的泡沫,对铝片具有良好的腐蚀效果。在本实验中,当铝片处于距底端4cm高度位置时,腐蚀速率达到1.0 mg/(cm2.h)。因此,黄原胶有望作为放射性污染大体积空腔容器静态泡沫去污的增稠剂。
Xanthan gum as a widely used biological thickener and foaming agent, with shear resistance and acid, alkali and anti-oxidation and other characteristics, these characteristics just meet the requirements of static foam decontamination thickener. In this paper, we measured and analyzed several factors (stirring rate, xanthan gum concentration, sodium carbonate concentration and temperature) that affect the viscosity of foaming liquid in alkaline system (Na2CO3 system) Glue concentration and placement time of foaming liquid on the stability of foams. The weight loss of aluminum sheets in acid foaming liquid and its formation foam was comparatively analyzed. The experimental results show that xanthan gum has certain stability both in alkaline solution and in acidic solution and can meet the requirements of foam decontamination. The stability of the xanthan gum decreases with time and is favorable for the foam decontamination. Disposal of waste. Xanthan gum acid foam liquid to produce a stable foam, aluminum sheet has a good corrosion effect. In this experiment, the corrosion rate reached 1.0 mg / (cm2.h) when the aluminum piece was at a height of 4 cm from the bottom end. Therefore, xanthan gum is expected to act as a thickener for static foam decontamination of radioactively contaminated large volume cavity containers.