脲酶喷洒工艺对赤泥矿化胶结及抑尘效果试验  

Experimental study on mineralization cementation and dust suppression of red mud by urease spraying process

作　　者：胡雯璐 刘鹏[1] HU Wenlu;LIU Peng(College of Civil Engineering,Nanjing Forestry University,Nanjing 210037,China)

机构地区：[1]南京林业大学土木工程学院,南京210037

出　　处：《林业工程学报》2025年第2期173-179,共7页Journal of Forestry Engineering

基　　金：国家自然科学基金(51809139)。

摘　　要：脲酶矿化胶结表面防护处理是处理赤泥堆场扬尘的新技术。利用喷洒工艺将脲酶溶液渗透到赤泥表层,进行脲酶矿化赤泥试验,研究胶结液浓度、喷洒轮数对矿化效果的影响,并对试样进行风蚀试验,探究风速、吹蚀时间对试样抗风蚀性能的影响。研究结果表明:一定范围内,试样微型贯入阻力及碳酸钙生成量随着胶结液浓度和喷洒轮数的提高而上升,但碳酸钙转化率随之下降,喷洒首轮碳酸钙转化率最高可达66.39%,0.5 mol/L胶结液浓度下试样碳酸钙转化率高于1.0 mol/L的;经处理的试样水稳定性随着喷洒轮数和胶结液浓度的增加逐渐提高,喷洒1~3轮崩解率降低16%~19%,风蚀率随之降低;风蚀率随风速和吹蚀时间增加而上涨,1.0 mol/L胶结液浓度下试样风蚀率较小。脲酶矿化技术可以克服赤泥碱性强、颗粒细等缺点,与胶结液反应生成大量碳酸钙晶体,将赤泥颗粒胶结成硬壳层,改变赤泥原有的松散颗粒结构,为赤泥提供强度和稳定性,有效提高其抗风蚀能力,大大减少赤泥吹尘现象的产生。脲酶矿化技术可有效提升赤泥的力学特性及抗风蚀性能,具有一定的参考价值。Urease mineralization cementation surface protection treatment is a new technology to deal with dust from red mud dumps.The urease mineralization test on red mud was conducted by applying a spraying process to penetrate the urease solution into the surface layer.This study examined the effects of cementing solution concentration and the number of spraying rounds on the mineralization outcome.Additionally,wind erosion tests were performed to assess the impact of wind speed and blowing time on the specimens resistance to wind erosion.The research results showed that,within a certain range,the miniature penetration resistance and calcium carbonate generation of the specimen increased with the increase of binder concentration and the number of spraying rounds,but the conversion rate of calcium carbonate decreased.The first round of calcium carbonate conversion rate of the spraying could reach up to 66.39%,and the conversion rate of the specimen under the concentration of 0.5 mol/L binder was higher than that of 1.0 mol/L.The water stability of the treated specimen was gradually improved with the increase of spraying rounds and concentration of cementing liquid,and the disintegration rate was reduced by 16%-19%in 1-3 rounds of spraying,and the wind erosion rate was reduced accordingly.The wind erosion rate increased with the increase of wind speed and blowing time,and the wind erosion rate of the specimen under the concentration of 1.0 mol/L binder was smaller.Urease mineralization technology addressed the challenges of red mud characteristics,such as its strong alkaline and fine particles,by reacting with the cementing solution to produce abundant calcium carbonate crystals.These crystals bind the red mud particles into a hard shell,transforming the original loose particle structure of red mud.This process enhanced the strength and stability of the red mud,significantly improving its resistance to wind erosion and greatly reducing the phenomenon of blowing dust from the red mud.Urease mineralization technology can ef

关 键 词：脲酶 喷洒工艺 赤泥 风蚀率 

分 类 号：X758[环境科学与工程—环境工程]