Abstract
A paste pipeline transportation of pumping backfill technology with long distance and high stowing gradient is proposed to solve the problem of filling slurry transportation with low concentration, the filling body poor quality, and the transportation difficulties with long distance and high stowing gradient in Heiniudong copper mine (HCM). The physical and chemical properties of the backfill material, backfill proportion test, circular pipe experiment, and backfill system analysis evaluation were studied in the laboratory and outdoor, and the application in HCM was carried out to evaluate the technology. The research results show the feasibility of considering classified tailings and binder as backfill aggregates, and the optimum proportion of cement-binder-classified tailings applied in the stope and goaf is 1 : 4 : 8 and 1 : 4 : 15, respectively, with paste rheological properties of mass fractions of both being 74%∼76% and the backfill strength of about 1.5 MPa at 28 d. Furthermore, when backfill proportions and rate of flow are 1 : 4 : 8 and 50 m3/h, the pressure loss of the pipeline is around 0.4 MPa/100 m, and the backfill pump meets the backfill requirements. On this condition, the technology is capable of obvious economic benefits with the backfill cost of only 25.56 yuan/t, remnant ore recovery rate of 80%, and new output value of 1.28 billion. It creates a precedent for the paste pumping backfill technology with long distance and high stowing gradient in cold and high-altitude areas. The technology also provides reference mining experience for similar mines.
Highlights
With the development of mining industry and depletion of shallow resources, a large amount of domestically residual ore resources and excessive mined-out areas in shallow have been produced
A large amount of domestically residual ore resource recycling is very important to many mines, and the mined-out areas existing in underground can cause geotechnical and environmental hazards, such as underground subsidence, stope, and regional instability [2]. us, the best way to deal with the problem is to utilize the tailings as a backfill material, returning them to mined-out areas through the cemented backfill technology (CBT) [3]
A paste-like self-flowing pipeline transportation backfill technology with long-distance pipeline transportation and high stowing gradient has been proposed to solve the difficult problems of deep mining in the Suncun Coal Mine (SCM) in 2008, and the backfill results have been proved to be effective [9]
Summary
With the development of mining industry and depletion of shallow resources, a large amount of domestically residual ore resources and excessive mined-out areas in shallow have been produced. The longdistance pipeline transportation with high stowing gradient is still an enormous challenge facing by the backfill system in many mines It is still a new technology in China. Domestically, the research on the paste pumping backfill system concerning long-distance pipeline transportation with high stowing gradient has been rarely concerned [5, 6]. A paste-like self-flowing pipeline transportation backfill technology with long-distance pipeline transportation and high stowing gradient has been proposed to solve the difficult problems of deep mining in the Suncun Coal Mine (SCM) in 2008, and the backfill results have been proved to be effective [9]. A paste pipeline transportation of pumping backfill technology (PBT) with long distance and high stowing gradient is proposed as a processing method at HCM [9]. The technology features of reliability and stability are developed
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