分别以抗坏血酸(VC)、草酸、对苯二酚、亚硫酸钠和硫酸亚铁为还原剂,以阿拉伯树胶为分散剂还原雷酸金制备金粉.利用SEM对所制金粉进行了表征,分析了还原剂种类对金粉形貌和粒径的影响.并且以弱还原性的VC作为还原剂,分别探究了分散剂种类、用量及反应体系pH值、加入速度和温度对金粉粒径的影响.经过优化工艺,在金溶液浓度为20 g/L,pH值为4,质量比ζ阿拉伯树胶∶Au)=5∶2,反应温度为50℃,金溶液加入速度为110 mL/min时,制备出呈类球形形貌和约2μm粒径的金粉.%The gold powders were obtained by chemical reduction of fulminating gold with vitamin C(VC),oxalic acid,hydroquinone,sodium sulfite or ferrous sulfate as reducing agent,and acacia gum and PVP as dispersing agent.The prepared gold powders were characterized by SEM and the effect of type of reducing agent on morphology of gold particles was discussed.The weak reductive VC was chosen as the reducing agent for preparing spherical gold powders.The influences of the dispersant type and its consumption,the pH value,adding speed and temperature of the reaction system on gold particle size were investigated.The results show that the gold powders with spherical morphology and particle size of about 2 μm are prepared while the mass concentration of gold solution is 20 g/L,the pH value is 4,the mass ratio of acacia gum to Au is 5∶2,the reaction temperature is 50 ℃ and the gold solution addition rate is 110 mL/min.
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