首先优化出鸭骨渣中可溶性钙提取的工艺,然后在此基础上将其制备成蛋白肽螯合钙。首先研究影响提取鸭骨渣中可溶性钙的几个因素,包括酸种类、盐酸用量、液料比、提取温度和提取时间,并通过Box-Behnken试验设计与分析优化最佳工艺参数;...首先优化出鸭骨渣中可溶性钙提取的工艺,然后在此基础上将其制备成蛋白肽螯合钙。首先研究影响提取鸭骨渣中可溶性钙的几个因素,包括酸种类、盐酸用量、液料比、提取温度和提取时间,并通过Box-Behnken试验设计与分析优化最佳工艺参数;然后研究影响蛋白肽螯合钙制备的几个因素,包括体积配比、p H、提取温度和提取时间。鸭骨渣中可溶性钙提取的最佳工艺参数为酸种类盐酸、盐酸用量1.72 m L/g、液料比18.9︰1(m L/g)和提取温度113℃,在此条件下实际得率为6.88%;蛋白肽螯合钙制备的最佳工艺参数为体积配比1︰2,p H 7.5,反应温度50℃和反应时间10 min,在此条件下实际螯合率为86%。采用盐酸提取鸭骨渣中可溶性钙及在此基础上将其制备成蛋白肽螯合钙都是可行的。展开更多
The deterioration of concrete by sulfuric acid attack in sewage environments has become a serious problem for many existing sewage structures. In this study, the properties of concrete using the blast furnace slag hav...The deterioration of concrete by sulfuric acid attack in sewage environments has become a serious problem for many existing sewage structures. In this study, the properties of concrete using the blast furnace slag have been examined. It was shown that by using the blast furnace slag fine aggregate and blast furnace slag fine powder, it is possible to enhance the resistance of mortar and concrete to sulfuric acid. The resistance to sulfuric acid of mortar and concrete can be improved by using a blast-furnace slag fine aggregate in the total amount of fine aggregate. When mortar or concrete reacts to sulfuric acid, dihydrated gypsum film is formed around the particulate of the fine aggregate. This dihydrated gypsum film could retard the penetration of sulfuric acid, thus, improving the resistance to sulfuric acid. Furthermore, it has been proved that the relationship between the erosion depth by sulfuric acid attack and the product of immersion period and concentration of sulfuric acid can be expressed linearly. However, this relationship is dependent on the type of materials of concrete.展开更多
文摘首先优化出鸭骨渣中可溶性钙提取的工艺,然后在此基础上将其制备成蛋白肽螯合钙。首先研究影响提取鸭骨渣中可溶性钙的几个因素,包括酸种类、盐酸用量、液料比、提取温度和提取时间,并通过Box-Behnken试验设计与分析优化最佳工艺参数;然后研究影响蛋白肽螯合钙制备的几个因素,包括体积配比、p H、提取温度和提取时间。鸭骨渣中可溶性钙提取的最佳工艺参数为酸种类盐酸、盐酸用量1.72 m L/g、液料比18.9︰1(m L/g)和提取温度113℃,在此条件下实际得率为6.88%;蛋白肽螯合钙制备的最佳工艺参数为体积配比1︰2,p H 7.5,反应温度50℃和反应时间10 min,在此条件下实际螯合率为86%。采用盐酸提取鸭骨渣中可溶性钙及在此基础上将其制备成蛋白肽螯合钙都是可行的。
文摘The deterioration of concrete by sulfuric acid attack in sewage environments has become a serious problem for many existing sewage structures. In this study, the properties of concrete using the blast furnace slag have been examined. It was shown that by using the blast furnace slag fine aggregate and blast furnace slag fine powder, it is possible to enhance the resistance of mortar and concrete to sulfuric acid. The resistance to sulfuric acid of mortar and concrete can be improved by using a blast-furnace slag fine aggregate in the total amount of fine aggregate. When mortar or concrete reacts to sulfuric acid, dihydrated gypsum film is formed around the particulate of the fine aggregate. This dihydrated gypsum film could retard the penetration of sulfuric acid, thus, improving the resistance to sulfuric acid. Furthermore, it has been proved that the relationship between the erosion depth by sulfuric acid attack and the product of immersion period and concentration of sulfuric acid can be expressed linearly. However, this relationship is dependent on the type of materials of concrete.