摘要
软化除硬过程是煤矿高矿化度矿井水零排放处理的重要环节,随着矿井水组成和矿化度的变化,传统双碱法除硬普遍存在投加药剂过量、除硬效果不佳等问题。为了揭示复杂成分体系下高矿化度矿井水的除硬影响机制,通过配制模拟水的方式探究原水及膜浓缩液化学法除硬在盐类型、矿化度、硬度等方面的影响;分别设计了SO_(4)-Na和Cl-Na两种盐类型,1000~60000 mg/L共4水平的矿化度梯度,及500、1000、2000 mg/L共3水平钙硬(以碳酸钙计)梯度试验。结果表明,矿化度升高对硬度的去除有显著负影响,矿化度低于15000 mg/L的低矿化度矿井水可参考双碱法的控制参数;SO_(4)-Na型矿井水沉淀反应速率较Cl-Na型矿井水显著变缓,高矿化度SO_(4)-Na型矿井水反应时间较传统双碱法需延长至10~20 min。而硬度升高对除硬有正向影响,高矿化度硫酸钠体系除外。探究了浓缩液体系阻垢剂影响下除硬的脱稳方法,结果表明Fe^(3+)、碳酸钙、硫酸钙晶种诱导法可有效改进膜浓缩液除硬效果。本研究建立了零排放工艺中不同水质化学法除硬的影响因素和优化操作建议,为矿井水零排放提供理论与技术支撑。
Softening and hardness removal process is an important part of zero discharge treatment of high salinity mine water.With the change of mine water composition and salinity,the traditional double alkali hardness removal method generally has the problems of excessive dosage of reagents and poor hardness removal effect.In order to reveal the influence mechanism of removing hardness of high salinity mine water in complex composition system,this paper explored the influence of raw water and membrane concentration on salt type,salinity,hardness and so on by preparing simulated water.Two kinds of salt,SO_(4)-Na and Cl-Na,were designed,and the experiment was carried out with salinity gradient of 1000-60000 mg/L and calcium hardness(calculated as calcium carbonate)gradient of 500,1000,2000 mg/L.The results show that the increase of salinity has a significant negative effect on the removal of hardness,and the low salinity mine water with the concentration of 15000 mg/L and below can refer to the control parameters of the dual-alkali process.The precipitation reaction rate of SO_(4)-Na type mine water is slower than that of Cl-Na type mine water,while the reaction time of the high salinity SO_(4)-Na mine water needs to be extended to 10-20 minutes compared with the traditional dual-alkali process.The increase of hardness has a positive effect on hardness removal,except for the high salinity sodium sulfate system.Under the influence of scale inhibitor,the destabilization method of hardness removal in the concentrated solution system was explored.Results show that Fe^(3+),calcium carbonate and calcium sulfate seed induction method can effectively improve the hardness removal effect of membrane concentrated solution.In this study,the influencing factors and optimal operation suggestions of different water quality chemical methods for hard removal in zero discharge process were established,which provided theoretical and technical support for zero discharge of mine water.
作者
李小端
郭强
唐佳伟
刘兆峰
蒋斌斌
闫祖喻
李井峰
LI Xiaoduan;GUO Qiang;TANG Jiawei;LIU Zhaofeng;JIANG Binbin;YAN Zuyu;LI Jingfeng(State Key Laboratory of Water Resource Protection and Utilization in Coal Mining,National Institute of Low-Carbon-and-Clean Energy,Beijing 102209,China;Shenhua Group Xinjie Energy Co.,Ltd.,Ordos 017200,China)
出处
《洁净煤技术》
CAS
CSCD
北大核心
2024年第S01期598-604,共7页
Clean Coal Technology
基金
国家能源集团科技创新资助项目(GJNY-21-129,GJNY-23-84)
关键词
矿井水
浓缩液
除硬
影响因素
阻垢剂
mine water
concentrated solution
hardness removal
influencing factors
scale inhibitor
