蛋白类缓凝剂对建筑石膏的适应性

Adaptability of Protein Retarder for Calcined Gypsum

关键词:  建筑石膏  蛋白类缓凝剂  酰胺基团  磷酸盐

Key words:  calcined gypsum  protein retarder  amide group  phosphate

摘要:

分析比较了4种分子结构相近的蛋白类缓凝剂对脱硫建筑石膏（FGD）和磷建筑石膏(PG)的缓凝效果.结果表明：具有不同酰胺键类型的蛋白类缓凝剂，其缓凝度受建筑石膏类型影响，且随建筑石膏pH值的增加而增大；当蛋白类缓凝剂的酰胺基团主要为仲酰胺时，其缓凝度随着H2PO-4含量的增加而降低，当蛋白类缓凝剂的酰胺基团主要为伯酰胺时，其缓凝剂不易受H2PO-4的影响；用于FGD的蛋白类缓凝剂宜选用仲酰胺为主的酰胺基团，用于PG的蛋白类缓凝剂宜选用伯酰胺为主的酰胺基团.

Abstract:

Four kinds of protein with similar molecular structure were chosen as the retarder of calcined gypsum from flue gas desulfurization(FGD) and phosphogypsum(PG) respectively and the retarding results were compared. The results show that the retarding degree of protein retarders with different amide groups is influenced by the type of calcined gypsum and increased with the increasing pH value of calcined gypsum. When the secondary amide is the main amide group of protein, the retarding degree is reducer as the amount of H2PO-4 increaser. When the primary amide is the main amide group of protein, the retarding degree is not influenced by H2PO-4. So retarder with the secondary amide as the main amide group of protein is suitable for calcined gypsum from FGD, and retarder with the primary amide as the main amide group of protein is suitable for calcined gypsum from PG.