磷酸锌生产工艺及干燥方法研究

Study of Zinc Phosphate Production Process and Drying Method

磷酸锌是一种性能优良的新型无毒防锈颜料,介绍了国内外的生产方法,确定了间接法是生产企业所选最优工艺,采用络合剂(Y)溶解粗氧化锌,降低了原料成本,同时将磷酸锌生产的固—液反应改变为液—液反应,缩短了反应时间,为大批量生产创造了条件。磷酸锌产品的传统干燥工艺时间长、劳动条件差、生产规模难以扩大,通过对磷酸锌蒸发曲线的分析,确定了提高干燥进口温度,采用连续气流干燥代替传统干燥工艺,产品中锌含量可达到国际标准的规定值。

Zinc phosphate is a novel toxicity-free rust-resistant pigment of excellent performance. Domestic and international production processes are described,and it is determined that the indirection process is the most optimum process for the company. Complexing agent( Y) is employed to solve crude zinc oxide,which reduces production cost,and in the meantime,the conventional solid-liquid reaction for zinc phosphate production is changed to liquidliquid reaction,which shortens the reaction duration,and paves the way for mass production. Conventional drying process for the zinc phosphate product is long,the working condition is poor,and it is difficult to expand the production capacity. Through analysis of the evaporation curve of the zinc phosphate,it is determined that through increasing the drying inlet temperature,and by using the continuous gas flow drying to replace the conventional drying process,the zinc content in the product can reach the values specified in the international standards.