摘要
磷石膏为骨料的充填工艺是采空区和固废处理方式之一,磷石膏的化学活性是影响充填效果的关键。以某矿拟开展的磷石膏充填料为对象,利用生石灰碱基作为激活剂,采用正交实验法设计16组配比组合进行试验。通过极差法分析单一指标(坍落度、3 d强度、7 d强度和28 d强度)下的最优配比,并利用矩阵分析法实现多目标综合分析优化,得到可行的优化组合配比,运用指标值预估法预测最终配比的力学特征值。结果表明:1)在各单一指标下第一主要影响因素均为磷石膏含量,而在坍落度、3 d强度和7 d强度三种指标下第二主要影响因素均为料浆浓度,在28 d强度指标下第二主要影响因素为石灰含量。2)多目标优化选择的充填体配比参数为磷石膏含量(质量分数)20%、水泥与尾矿比1:6、料浆浓度(质量分数)80%、石灰含量(质量分数)1%,充填体的力学特性预估值为坍落度10.1936 cm、3 d强度0.6108 MPa、7 d强度1.2734 MPa、28 d强度2.5748 MPa。3)建立不同因素的影响关系模型图,各指标值(坍落度、3 d强度和7 d强度)与主要影响因素之间均符合Z=Ax^(2)+By^(2)+Cx+Dy+Exy+F关系。
The filling technology of phosphogypsum as aggregate is one of the treatment methods of goaf and solid waste,and phosphogypsum’s chemical activity is the key to affect the filling effect.Taking phosphogypsum filling to be carried out in a mine as the object,and the base in quicklime was used as an activator.According to the orthogonal experiment method,16 groups of ratios were designed to carry out combined experiments.The range method was used to analyze the optimal ratio under each index(slump,3 d compressive strength,7 d compressive strength and 28 d compressive strength),and the matrix analysis method was used to analysis and optimize to obtain the feasible optimal ratio,and the index value prediction method was used to predict the mechanical characteristic value of the final ratio.The results indicate that:1)The content of phosphogypsum is the first main influencing factor under various indexes,and the second main influencing factors for the three indexes of slump,3 d strength and 7 d strength next time are the slurry concentration.Under the 28 d strength index,the second main influencing factor is lime content.2)The final parameters of the optimally selected backfill are as follows:phosphogypsum of 20%,cement to tailings ratio of 1:6,slurry concentration of 80%,and quicklime of 1%.Its estimated values of mechanical properties are slump of 10.1936 cm,3 d strength of 0.6108 MPa,7 d strength of 1.2734 MPa,28 d strength of 2.5748 MPa.3)The influence relation model of different factors is established.The relationship between various index values(slump,3 d strength and 7 d strength)and the main influencing factors are in accordance with the relationship of Z=Ax^(2)+By^(2)+Cx+Dy+Exy+F.
作者
赵风文
胡建华
曾平平
王学梁
赵磊
ZHAO Feng-wen;HU Jian-hua;ZENG Ping-ping;WANG Xue-liang;ZHAO Lei(School of Resources and Safety Engineering,Central South University,Changsha 410081,China;Hubei Sanning Mining Co.,Ltd.,Yichang 443100,China)
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2021年第4期1096-1105,共10页
The Chinese Journal of Nonferrous Metals
基金
国家自然科学基金资助项目(41672298)
国家重点研发计划资助项目(2017YFC0602901)。
关键词
正交试验
极差法
矩阵分析法
指标值预估
关系模型
orthogonal test
range method
matrix analysis method
index value prediction method
relationship model
