硅切割废砂浆制备δ-层状结晶二硅酸钠的研究  

Synthesis of crystalline δ-Na_2Si_2O_5 from drained slurry generated by cutting silicon crystal

作　　者：徐冬梅[1] 仝宇[1] 

机构地区：[1]山东科技大学化学与环境工程学院,山东青岛266510

出　　处：《现代化工》2010年第12期47-49,51,共4页Modern Chemical Industry

基　　金：山东科技大学"春蕾计划"资助项目(2008BWZ055)

摘　　要：介绍了硅切割废砂浆的来源、组成以及δ-层状结晶二硅酸钠作为优异的无磷洗涤助剂的性能和特点。提出在回收废砂浆中的磨料碳化硅粉和切削液聚乙二醇的同时,以废砂浆中的硅粉为硅源,制备δ-层状结晶二硅酸钠,并阐述了该方法的基本原理和工艺流程。探讨了该方法中各种因素对产品质量的影响;确定了最佳的工艺条件:①水解反应中,废砂浆干粉和氢氧化钠的质量比1.85∶1,反应温度80℃,反应时间210 min;②二硅酸钠晶型转化(S→δ)中,焙烧温度690～710℃,焙烧时间60～70 min,所得产品的最大钙离子交换能力为344 mg/g,最大镁离子交换能力451 mg/g。The sources and compositions of drained slurry generated by cutting silicon crystal is introduced in the paper. The performance and characteristics of crystalline δ-Na2 Si2 05 , as an excellent builder of phosphate-free detergent, is introduced too. A new recovery method of the SiC abrasives and the PEG cutting fluids from drained slurry with synthesis of crystalline δ-Na2Si2O5 from silicon powder in drained slurry is proposed. The basic principles and the technological process are described. The effects of various factors on product quality are investigated and the optimal conditions are determined：（1）in the hydrolytic reaction, the mass ratio of dry powder of drained slurry to NaOH is 1.85： 1 ,reaction temperature is 80℃, reaction time is 210 min; （2）as crystal transformation of Na2Si205 （δ-8）, calcination temperature is 690- 710℃, calcination time is 60 -70 min. Under the optimal conditions, the calcium ion exchange capacity of the product reaches 344 mg CaCO3/g,and the magnesium ion exchange capacity reaches 451 mg MgCO3/g.

关 键 词：废砂浆 硅 层状结晶二硅酸钠 碳化硅 

分 类 号：TQ127.2[化学工程—无机化工]