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Anrikningsförsök i laboratorieskala med hematit från Gruvberget
2011 (Swedish)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Abstract The purpose of this work was to evaluate the possibility for enrichment of hematite from Gruvberget (HGB) in Malmberget’s beneficiation plant. To answer the question if it is possible or not to enrich HGB under exactly same conditions as hematite from Malmberget (HMB), two parallel laboratory beneficiation experiments were conducted. From the laboratory results following conclusions were made: The main difference between HGB- and HMB- ore is their texture. HGB has a fine massive structure with no distinct grain boundaries. HMB has a metamorphic coarse structure with distinct grain boundaries. The structural difference of this two materials leads to different results under gravimetric separation. Regarding the comminution the HMB-ore is easy to crush but difficult to grind. HGB-ore is more or less difficult to crush but easy to grind. Grinding time for HGB in the rod mill is about half of grinding time for HMB. In the ball mill grinding time HGB is about 40% less than that of HMB under the same conditions. During the grinding process of HGB in both the rod- and ball-mill, quick generation of fine particles was observed. Such behavior generates quite quickly the desired k80 particle size, while there still are some pebbles left which form a coarse fraction. Such behavior contributes to a flat-shaped sieving curve for HGB in both rod- and ball-mill. Fairly large amount of iron in fine fraction is lost to waste during gravimetric concentration of HGB, while the separation of the waste rocks minerals was not as effective for HGB as for HMB in gravimetric circuit. The highest recovery of phosphorus for the HGB was obtained in the gravimetric-waste stream. CaO and SiO2 from HGB-ore, unlike HMB, have both reached their highest concentration and recovery in the WHIMS-waste stream. Regarding concentration of trace elements in both gravimetric- and magnetic separation-waste, had HGB only slightly higher concentration of MnO and V2O5 than HMB. In order to continue with hematite project, it can be of great interest to perform a series of designed experiments In order to obtain the optimal liberation for crushing and grinding of the HGB-ore. Possibility of alternative separation methods such as flotation is recommended to be used.

Place, publisher, year, edition, pages
2011. , 131 p.
Keyword [en]
Technology
Keyword [sv]
Teknik, Anrikning, laboratorieskala, hematit, Gruvberget
Identifiers
URN: urn:nbn:se:ltu:diva-51788Local ID: 8f83ffb7-98b9-4f0d-ae84-b34db1ac1f79OAI: oai:DiVA.org:ltu-51788DiVA: diva2:1025152
Subject / course
Student thesis, at least 30 credits
Educational program
Chemical Engineering, master's level
Examiners
Note
Validerat; 20111204 (anonymous)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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Citation style
  • apa
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  • modern-language-association-8th-edition
  • vancouver
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  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
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Output format
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