CAJ | 학술논문

为解决湖北三宁矿业挑水河磷矿选厂重介质作业尾矿直接堆存存在的污染环境和土地占用等问题,在对该尾矿进行性能测定的基础上,开展了将其作为胶结材料用于充填采矿的可行性试验. 结果表明:磷尾矿颗粒表面粗糙,有害元素含量低,可以作为胶结材料;磷尾矿为骨料制备的充填体不同龄期抗压强度均随灰砂比和料浆浓度增加而增强,但料浆浓度对充填体抗压强度影响相对较大;充填料浆坍落度、坍落扩散度和稠度均随灰砂比和料浆浓度增大而增大. 为进一步降低胶结材料成本,还进行了粉煤灰部分替代水泥作为胶结材料的可行性正交试验. 结果表明:粉煤灰的添加有利于充填体强度的增高,尤其是后期强度的增长;充填料浆坍落度随灰砂比、料浆浓度和粉煤灰掺量增大均先增后减,且影响程度由强到弱依次为灰砂比>料浆浓度>粉煤灰掺量. 由于粉煤灰颗粒粒度细,且部分颗粒呈球形,使其在料浆中可以发挥滚珠轴承效应,减小了磷尾矿颗粒之间的摩擦力,进而提高了料浆的和易性;粉煤灰内部空隙多,随着粉煤灰掺量的增加,需水量也随之增大,导致充填料浆的黏稠性增大,阻碍了料浆中骨料的移动,进而使得坍落度和稠度随粉煤灰掺量增加呈现先增后降的规律. 试验确定的胶结材料最佳配比为灰砂比0. 250、料浆浓度80%、粉煤灰掺量1. 00. 利用粉煤灰和粗磷尾矿进行胶结充填具有显著的经济、环境和社会效益.
위해결호북삼저광업도수하린광선엄중개질작업미광직접퇴존존재적오염배경화토지점용등문제,재대해미광진행성능측정적기출상,개전료장기작위효결재료용우충전채광적가행성시험. 결과표명:린미광과립표면조조,유해원소함량저,가이작위효결재료;린미광위골료제비적충전체불동령기항압강도균수회사비화료장농도증가이증강,단료장농도대충전체항압강도영향상대교대;충전료장담락도、담락확산도화주도균수회사비화료장농도증대이증대. 위진일보강저효결재료성본,환진행료분매회부분체대수니작위효결재료적가행성정교시험. 결과표명:분매회적첨가유리우충전체강도적증고,우기시후기강도적증장;충전료장담락도수회사비、료장농도화분매회참량증대균선증후감,차영향정도유강도약의차위회사비>료장농도>분매회참량. 유우분매회과립립도세,차부분과립정구형,사기재료장중가이발휘곤주축승효응,감소료린미광과립지간적마찰력,진이제고료료장적화역성;분매회내부공극다,수착분매회참량적증가,수수량야수지증대,도치충전료장적점주성증대,조애료료장중골료적이동,진이사득담락도화주도수분매회참량증가정현선증후강적규률. 시험학정적효결재료최가배비위회사비0. 250、료장농도80%、분매회참량1. 00. 이용분매회화조린미광진행효결충전구유현저적경제、배경화사회효익.
In order to solve the problems of environmental pollution and land occupation by direct stock of Phosphate Tailings( PT) from dense medium separation of Tiaoshuihe Phosphate Plant,Sanning Mining,Hubei Province. Feasibility tests of PT used as cementing material for filling in mining operation was conducted on the basis of its property measure-ment. Results indicated that:coarse PT can be used as cementitious material for its roughness surface and low content of harm-ful elements;Compressive strength of backing filling body in each age enhanced with the increase of cement-sand ratio and slurry concentration,while slurry concentration has more influence on compressive strength of filling body;filling pulp slump, slump flow and consistency all increased with the increase of cement-sand ratio and slurry concentration. In order to further re-duce the cementing material cost,feasibility of cement partly replaced by Fly Ash( FA) as cementing material orthogonal exper-iment were conducted. The results showed that:addition of FA is beneficial for the strength enhance of filling body,especially long-term strength;filling slurry slumps first increase and then decrease with the increase of cement-aggregate ratio,slurry con-centration and dosage of FA,and the impaction weakened by cement-aggregate ratio,slurry concentration,dosage of FA. FA can play a role in ball bearing effect for its fineness particle sizes and partly in spherical form,thus reduce the friction between phosphate tailing particles and improve the workability of slurry;there are so many internal spaces inside the FA,with the dos-age increase of FA,water demanding also increases,which resulted in the viscosity increase of the filling pulp,hindered aggre-gate moving in the slurry,consequently,both slumps and consistence show first increase and then decrease rule with dosage of FA. The optimum ratio of cementitions mateials are cement aggregate ratio 0. 250, sturry concentration 80%, dosage of FA 1. 00. Using PT and FA in cemented backfilling industry has significant economic,environmental and social benefits.