二氧化硫溶解搅拌机的改造

二氧化硫溶解搅拌机是针对选矿生产工艺需求,将二氧化硫气体溶解到矿浆中并进行充分搅拌的一种机械设备,在溶解二氧化硫遇到以下几个方面的困难:二氧化硫遇水生成亚硫酸,亚硫酸与空气接触生成硫酸,硫酸具有强腐蚀性,容易对搅拌机机体造成腐蚀;溶解不充分的二氧化硫气体易泄漏造成人体伤害和大气污染等问题。本文主要阐述了二氧化硫溶解搅拌机结构的逐步改进,旨在解决以上问题,并使气体二氧化硫充分溶解至矿浆中,为生产指标的完成提供条件。

生产波里诺西克纤维粘胶溶解机的改造

将用于生产普通粘胶纤维的粘胶溶解机改造为生产波里诺西克纤维的粘胶溶解机,改造后的粘胶溶解机不仅可用于生产波里诺西克纤维,而且仍可用于生产普通粘胶纤维。改造后的粘胶溶解机启动输出扭矩大,电耗降低,故障率低。介绍了对粘胶溶解机搅拌器、传动装置及导流圈进行的改造。

Dissolution Characteristics of Hydrophobically Associating Polyacrylamide in Stirred Tanks

Enhanced oil recovery(EOR)by means of polymer flooding is an important technology for the strategic development of offshore oilfields in China.Hydrophobically associating polyacrylamide(HAPAM)has been recently proposed as a new flooding agent.The solubility of HAPAM is low,which is the bottleneck for further improving the oil recovery through polymer flooding in offshore oilfield.Stirred tanks have been used on offshore platforms to enhance HAPAM dissolving.But there is little literature on the study of HAPAM dissolving characteristics in stirred tanks.In this paper,effects of temperature,salinity,stirring speed,impeller type and stirring method on the dissolution of HAPAM are reported.The experimental results manifest that the dissolving rate of HAPAM increases with temperature and stirring speed,but the viscosity of the polymer solution decreases.There is an optimal range of salinity for polymer dissolving.Combining the operation mode of up-pumping with varying stirring speed,hydrofoil impeller can accelerate the dissolution of HAPAM and maintain a high solution viscosity.