The oxidation of sulphide minerals

Dunn, J.G.

doi:10.1016/s0040-6031(96)03132-2

Cited by 80 publications

(48 citation statements)

References 25 publications

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“…In terms of the roasting process, the greatest attention should be paid to the presence of PbS, CuFeS 2 , and FeS 2 in the concentrates, their oxidation [17][18][19][20], and interaction of obtained oxides with SiO 2 because easily meltable lead-ironcopper silicates can be obtained.…”

Section: Resultsmentioning

confidence: 99%

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Study of Zinc Sulfide Concentrates by DTA, TGA, and X-Ray Analyses and Their Roasting in Fluidized Bed Furnace

Boyanov

Peltekov

2013

ISRN Industrial Engineering

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Bulgaria is a major producer of zinc in the Balkans (about 100,000 tons per year). The two zinc plants (KCM S.A., Plovdiv, and LZC S.A., Kardzhali) deliver the necessary raw materials from Bulgaria and abroad. But the zinc production at LZC Kardzhali for nearly a year has stopped. Turkey is a main producer of zinc sulfide concentrates from the Balkan countries. In this connection, an analysis of the delivered Turkish sulfide zinc concentrates is made through statistical processing of data about their chemical content. For the aim of processing them according to the classic hydrometallurgical scheme, studies are carried out using X-ray phase analysis as well as DTA and TGA. Providing optimal charge for roasting in fluid bed furnace (FBF) can be successfully done by using the WEBbased information system we have written, which calculates mixtures of different raw materials. The program system developed is illustrated by calculations of charges of 5 zinc concentrates from Turkey. The accomplishment of optimal mixing of concentrates and providing a stable mix composition for a long period of time is a task of primary importance in the technological process control in zinc hydrometallurgy.

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Section: Resultsmentioning

confidence: 99%

“…The first, at a temperature interval of 460-480 ∘ C, results from the oxidation of iron and copper sulfides [14,[16][17][18][19][20]. This low-temperature exothermically effect is especially visible on the DTA curves of the most Turkish concentrates.…”

Section: Resultsmentioning

confidence: 99%

Study of Zinc Sulfide Concentrates by DTA, TGA, and X-Ray Analyses and Their Roasting in Fluidized Bed Furnace

Boyanov

Peltekov

2013

ISRN Industrial Engineering

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“…Yang et al [8,9] investigated the spontaneous combustion potential of sulfide concentrates in storage and mechanism of mechanical activation for spontaneous combustion of sulfide minerals. Dunn [10] used thermal analysis to present the oxidation of pyrite and founded the oxidation occurs as a sequence of reactions usually controlled by oxygen diffusion. Iliyas et al [11] proposed an improved thermal analysis methodology for thermal stability and safety analysis of sulfide mineral selfheating.…”

Section: Introductionmentioning

confidence: 99%

Early detection of spontaneous combustion disaster of sulphide ore stockpiles

2015

Teh. vjesn.

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Original scientific paper The fire hazards induced by the spontaneous combustion of sulphide ores pose safety, environmental, and economic concerns to the mining and metallurgical industries and have become one of the most important problems in mining, particularly when sulphide ores have to be stored for a long time or transported for a long distance. The first purpose of this paper is the selection of a suitable detection indicator for running through the entire process of spontaneous combustion from oxidation to fire and accurately determining the position of the fire source of the spontaneous combustion of sulphide ore stockpiles at an early stage. We conducted on-site and laboratory experiments by using five indices to assess the oxidation characteristics of sulphide ores. Experimental results show that the change of surface temperature on sulphide ore stockpiles could indirectly reflect the nature of sulphide ore oxidation and is closely related to the various stages of spontaneous combustion. On the basis of the temperature anomaly analyses and infrared thermal imaging technology, a new fire source detection method, which can monitor the highest temperature point on the surface of self-igniting ores, was proposed. The investigation result shows that the maximum temperature differences are 0,5; 0,16 and 0,04 °C at the detection depths of 2, 3, and 5 m, respectively, and a scope of 1 × 1 m when close to the self-ignition duration. Under the same condition, the maximum temperature differences are 1,39; 0,53 and 0,14 °C at a scope of 2 × 2 m. Therefore, the infrared thermal imaging system with a sufficiently high accuracy can be used to measure the temperature differences on the surface of ore stockpiles, thus resulting in the determination of fire source position. Keywords: mine safety; sulphide ore stockpiles; spontaneous combustion; detection of fire source; infrared thermal imaging Rano otkrivanje katastrofe nastale spontanim izgaranjem naslaga sulfidne rudeIzvorni znanstveni članak Opasnost od vatre izazvane spontanim izgaranjem sulfidnih rudača važno je sigurnosno, ekološko i ekonomsko pitanje za rudarstvo i metalurgiju, a postalo je jedan od najvažnijih problema u rudarstvu, posebice kada je potrebno dugotrajno uskladištiti sulfidne rudače ili ih prenositi na velike udaljenosti. Osnovna je svrha ovoga rada odabir odgovarajućeg indikatora detekcije kroz cjelokupni proces spontanog izgaranja od oksidacije do vatre uz točno određivanje mjesta nastanka vatre kod spontanog izgaranja naslaga sulfidne rude u ranom stadiju. Proveli smo terenske i laboratorijske eksperimente koristeći pet pokazatelja kako bi odredili karakteristike oksidacije sulfidnih rudača. Eksperimentalni rezultati pokazuju da bi promjena površinske temperature na naslagama sulfidne rudače mogla indirektno odražavati prirodu oksidacije sulfidne rudače te da je usko povezana s različitim stadijima spontanog izgaranja. Na temelju analiza temperaturnih anomalija i tehnologije infracrvene termografije, predložena je nova metoda za otkrivanje iz...

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“…These problems were already described in many studies, e.g. in [1][2][3][4][5][6][7][8][9][10]. The effect of pyrite on the oxidation rate ZnS [1], and the ZnS kinetics oxidation of fluidized bed [2], the possibility of zinc ferrite formation [3,6] was investigated.…”

Section: Introductionmentioning

confidence: 99%

“…The effect of pyrite on the oxidation rate ZnS [1], and the ZnS kinetics oxidation of fluidized bed [2], the possibility of zinc ferrite formation [3,6] was investigated. In [4][5][6]10] the effect of various roasting parameters (temperature, grain size, the addition of lime) on the ignition temperature and calcination products was evaluated. However, in the papers [6,8,9], the effects of marmatite for zinc concentrate roasting process was determined.…”

Section: Introductionmentioning

confidence: 99%

Thermogravimetric Analysis of the Zinc Concentrates Oxidation Containing Various Iron Compounds

Małecki¹,

Jarosz²

2014

Archives of Metallurgy and Materials

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This paper presents the results of oxidation of zinc concentrates containing various iron compounds. Using the thermogravimetry and thermal analysis methods it was shown that the influence of the iron form affects the thermal oxidation process. They influence the rate of, oxidation of zinc sulphide and consequently the resulting rate of oxidation of the concentrate.Keywords: roasting, zinc concentrates, thermal analysis, iron compounds W pracy przedstawiono wyniki badań utleniania koncentratów cynku zawierających różne związki żelaza. Wykorzystując metody termograwimetrii i analizy termicznej wykazano wpływ formy występowania żelaza na efekty cieplne utleniania. Rzutują one na szybkość utleniania siarczku cynku i związaną z tym szybkość utleniania koncentratu.

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The oxidation of sulphide minerals

Cited by 80 publications

References 25 publications

Study of Zinc Sulfide Concentrates by DTA, TGA, and X-Ray Analyses and Their Roasting in Fluidized Bed Furnace

Study of Zinc Sulfide Concentrates by DTA, TGA, and X-Ray Analyses and Their Roasting in Fluidized Bed Furnace

Early detection of spontaneous combustion disaster of sulphide ore stockpiles

Thermogravimetric Analysis of the Zinc Concentrates Oxidation Containing Various Iron Compounds

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