聚合氯化铝工业废渣生产硅肥实验研究

以聚合氯化铝废渣为原料，采用单因素实验和正交设计研究了焙烧温度、焙烧时间、添加剂配比等因素对聚合氯化铝废渣中二氧化硅活化效果的影响，确定了利用聚合氯化铝废渣生产硅肥的工艺技术条件。结果表明，3个因素对聚合氯化铝废渣焙烧产品的有效硅含量和废渣中硅活化率影响显著性大小为：活化剂用量 > 焙烧温度 > 焙烧时间。其中活化剂用量和焙烧温度对聚合氯化铝废渣焙烧产品中的有效硅含量有明显影响，而焙烧时间对聚合氯化铝废渣焙烧产品中的有效硅含量没有明显影响。随着活化剂用量的增加，所得产品中有效硅含量增加，活化剂用量达到41%以后，有效硅含量趋于稳定，活化剂用量与有效硅含量的相关系数达到0.9829；随着焙烧温度的升高，所得产品中有效硅含量增加，达到1250℃以后，有效硅含量达到峰值；焙烧时间对废渣中有效硅含量和硅活化率的影响不显著。温度为1240 ~ 1270℃、时间为30 ~ 40 min、活化剂用量为41% ~ 45%时，所得产品中有效硅含量较高，达到30%左右。

Experiment on Production of Silicon Fertilizer from Polyaluminum Chloride Industrial Waste Residue

Using polyaluminum chloride residue as raw material, the effects of roasting temperature, roasting time, additive ratio and other factors on the activation effect of silicon dioxide in polyaluminum chloride residue were studied by single factor experiment and orthogonal design, and the technological conditions for producing silicon fertilizer from polyaluminum chloride residue were determined. The results show that the significant influence of three factors effective silicon content and the activation rate of silicon in polyaluminum chloride waste residue is as follows: activator dosage > calcination temperature > calcination time. The amount of activator and calcination temperature have obvious influence on the content of effective silicon in the calcined product, while the calcination time has no obvious influence on the content of effective silicon in the calcined product. With the increase of the amount of activator, the effective silicon content in the product increases. When the amount of activator reaches 41%, the effective silicon content tends to be stable, and the correlation coefficient between the amount of activator and the effective silicon content reaches 0.9829; with the increase of calcination temperature, the effective silicon content in the product increases, and reaches the peak after 1250℃, when the temperature is 1240～1270℃, the time is 30～40 min and the dosage of activator is 41%～45%, the content of effective silicon in the product is the highest, reaching about 30%.