Cementstabiliserad Gråbergsfyll i Garpenbergsgruvan: En idéstudie
Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
The Garpenberg Mine utilizes a large scale mining procedure that demands that the primary stopes are refilled with stabilised fill. Current paste fill plant will not be able to meet the demands of future production increases. At the same time there is access to waste rock that can be used if stabilised. The surplus is driven above-earth and adds large costs. The purpose is that through literature study, study visits and interviews account for criterias of an adapted production of high quality Cemented Rock Fill (CRF). Study visits have been done in the Renström, Kristineberg, Garpenberg and Kylylahti mine. The report limits itself to primarily focus on the technical factors. With regards to the mentioned question formulation a new fill method will have to be introduced or a rebuilding of the current Paste fill plant has to be performed. We have presented an example of how a CRF for Garpenberg may be like. The biggest advantage that we can see with CRF is that it can be a flexible complement to Paste fill. This might solve the problem that arises if Paste fill pipelines break down during blastings and would reduce the volumes of Waste Rock above-ground. Thus also reducing the costs for transportation and aftertreatment.The proposal is at first hand to manufacture a CRF with uncrushed waste rock. This makes it possible to reduce unit operations. The basis is to check the possibility to use CRF in the same way as Kylylahti. We see this as an advantage, since the knowledge already exists within the organization. The difference between the depths of the mines (Garpenberg and Kylylahti) amounts to the transportation of slurry (mixture of solid particles within fluid) becoming significantly longer in Garpenberg when calculated in meters of altitude. We see a solution by transporting the slurry through a pipeline down to a fill station. Strength is important but a problem we have identified is that testing is difficult to perform outside of full scale tests by usage of uncrushed waste rock in the fill. Therefore, we recommend a full scale test before any decisions of the method is taken. The key to successful CRF is to coat as much of the Waste Rock surface with cement in the shortest possible amount of time. The strongest two-way interaction for the strength of CRF is between the content of fines and the type of binder. Particle size distribution is inevitable but it is desirable being able to control so that the highest strength appears on the surfaces that will be exposed in the future.
Place, publisher, year, edition, pages
2015. , 126 p.
Life Earth Science
Bio- och geovetenskaper, CRF, cementstabiliserad gråbergsåterfyllning, cement, gråberg, bindemedel, fyllning, slurry, pastefyll, återfyllning, gruva, Boliden, Renström, Storliden, Garpenberg, Kylylahti, kornstorleksfördelning, aggregat, fraktionering, storlekssorteringen, ledningssystem., CRF, Cemented rock fill, cement, waste rock, binders, fill, slurry, Paste fill, Pastefill, backfilling, mine, Boliden, Renström, Storliden, Garpenberg, Kylylahti, grain size distribution, aggregate, fractionation, sizing, pipeline.
IdentifiersURN: urn:nbn:se:ltu:diva-54739Local ID: baaa16df-2046-4acf-a08a-8d4ac95da1a9OAI: oai:DiVA.org:ltu-54739DiVA: diva2:1028121
Subject / course
Student thesis, at least 15 credits
Mining and Geotechnical Engineering, bachelor's level
Validerat; 20151005 (global_studentproject_submitter)2016-10-042016-10-04Bibliographically approved