臭氧化对添加聚丙烯酸钠的坡缕石泥浆稳定性影响

Influence of Ozonization on the Stability of Palygorskite Mud Added Sodium Polyacrylate

聚丙烯酸钠（PAAS）有助于坡缕石泥浆中杂质颗粒的沉降分离,但同时也使得去除杂质后的坡缕石泥浆难以实现泥水分离。本文对泥浆中的PAAS进行臭氧化处理,并对比分析了臭氧化对坡缕石泥浆稳定性的影响。结果表明：经过6~8 h的臭氧化处理后,PASS的长碳链被破坏,最终转化为CO2和H2O;体系先后经历了酸化（降解出小分子有机酸）和碱化（Na＋积累）阶段,最终实现无机化的转变;经过一次离心分离后,可将坡缕石泥浆浓度从略低于1%增加到4%。在此条件下,臭氧化处理可减小坡缕石泥浆固液分离的难度,有助于降低坡缕石提纯的成本,能显著提高含坡缕石泥浆的回收率。

Sodium polyacrylate（ PAAS） was a helpful dispersant to be added for removing the detrital impurities in palygorskite clay mud. PASS in palygorskite mud also increased difficulties in the clay-liquid separation in the sediment process. In this paper,ozone was used for the ozonation of PAAS in the mud. The results showed thatafter 6 ~8 hours ozonization,the carbon chains in PAAS were broken to CO2 and H2O accompanied with p H changes,with acidification and then with alkalization process,which was featured by the increase of low molecular weight organic acids and the accumulation of Na＋separately. The system ultimately became inorganic status while the TOC was zero. Based on the ozonization,the concentration of palygorskite in the mud increased from 1% to 4% by one-time centrifuging. Under the test condition,ozonization could reduce the difficulty of separating of the clay-liquid,and cut down the cost of purification.