The present contribution is aimed at the  production of a high-grade barite concentrate front complex  iron ores of ore-deposit Kremikovtzi,Bulgaria. The ores consisting main-ly of limonite,   hematite   and  siderite have been bene-ficiated by high intensity  electromagnetic wet separation

on magnetic separator type Jones DP 317. Barite flotation has been succeeded from non-magnetic fraction merged with ground barite rear materials.   The collecting  flotation agents OMC 199 and AERO 8-15    (2:1 ratio)  at the total dosage rate of 400-450 g/t have been applied. The frother OrePrep F 501 consumption has been 10-15 g/t_ Water glass has been applied as a silica depressant at the application rate of 4-4.5 kg/t.     Annual output of flotation barite concentrate reach   120 000 tons. Of this quantity 75 wt. i7c are exported in bulk with total assay of   BaSO4 and SrSO4 97-98 wt % and 8 wt % moisture.    The rest part is

dried, ground and bagged. The qualirr corresponds to OCMA (Oil Companies    Material    Association) /API (American Petroleum Institutes requirements

Georgiev, R

Hadjiev, A

Hadjiev, P

English

eprints@NML

HWOWIIlP ll I iV 114 Nit Ila x nf 641 '.^ I^^ ^ I ^Ii 11H^1' li 4""b' 4L 4W1 1^ I 1,* 161 IIM,^MII^I^YII1_SBN : h•1 ,57(J3_,-,_^-4Processing of Fines (2)Edc P Blralrai hcuvve . K. Srn,q /, and N . G. (;crstlnuirC^ Al IL Jawslit dh ;rr-.53I ()V ) 7. trldrlr . 2000. pip . 322-230Flotation of barite from complex iron oreA. HADJIEV', P. HAD.TIE-V- and R . GEORGIEVr'Geological Institute , Sofia, Bulgaria-Universiiv of lYfinin-g and Geology, Sofia, Bulgaria3Krernikovt3i AD, Sofa, BulgariaABSTRACTThe present contribution is aimed at the production of a high-gradebarite concentrate front complex iron ores of ore-deposit Krerrtikovrzi,Bulgaria. The ores consisting main-1),of limonite, hematite and sideritehave been heneficiated by high intensity electromagnetic wet separationon magnetic separator type Jones DP 317. Barite flotation has beensucceeded from non-magnetic fraction merged with ground barite rearmaterials. The collecting flotation agents OMC 199 and AERO 8-15(2:1 ratio) at the total dosage rate of 400-450 g/t have been applied.The frother OrePrep F 501 consumption has been 10-15 g/t_ Waterglass has been applied as a silica depressant at the application rate of4-4.5 kg/t. Annual output of flotation barite concentrate reach 120 000tons. Of this quantity 75 wt. i7c are exported in bulk with total assay ofBaSO4 and SrSO4 97-98 ►vt. % and 8 rvt. % moisture. The rest part isdried, ground and bagged. The qualirr corresponds to OCMA (OilCompanies Material Association) /API (American Petroleum Institutesrequirements.Keywords : Industrial minerals, Barite concentrate, Magnetic sepuration, I rurGflotationINTRODUCTIONThe production of flotation harite concentrate from mined complex iron oresand raw harite materials at Kremikovtzi mine are subjects of examination in thepresent paper. The heneficiation plant was put into operation in 1964 and wattfitted out with magnetizing roasting kilns, low intensity magnetic separators.flotation cells, concentration tables and equipment for dewatering and drying ofconcentrates. The implemented technology was not environmentally friendly1:].gave rise to problems, did not provided a high recovery for harite (only up to 35wt.`/c), could not output high-grade (833-93.5 wt.17c) harite concentrate"'. TheA. HADJIEV et al.recovery of barite from the ores of the ore-deposit Kremikovtzi was enhancedafter performing of two Humbolt Wedag high intensity magnetic separators typeJones DP 317 and by the usage of more effective flotation reagents since 1990.CHARACTERIZATION OF RAW MATERIALS IN ORE-DEPOSITKREMIKOVTZIThe mineralogical composition of the ores from Kremikovtzi ore-deposit isvery complex. It includes limonite, siderite, hematite , barite and some othermineral bearers of manganese , lead, and barium and less copper''". Data relatingthe contents of main components in the various ores during exploration of indus-trial types of ores are presented in Table 1. The hematite and lead ores containthe lowest quantities of barium sulfate.According to M. BenovE4' reserves of barite in the ore-deposit are 58.4 Mt.,out of them 28.8 Mt are in barite raw material , Moreover, 4.3 Mt barite rawmaterials with BaSO4 content of 28-45 wt.% are in stacks arranged during thedevelopment of the ore-deposit. Several mineralogical and geochemical certainfeatures in siderite were observed penetrating into the minefieldE', 61. More than90 wt.% from them are siderite , barite and quartz. Data provided in consequencefrom the exploration and exploitation of Kremikovtzi ore-deposit show that thebarite is the most widespread non-metalliferous mineral . It can be met in theform of cores and veins and almost everywhere, barite is merged intimately withsiderite and limonite ores . The other barium containing mineral viterite is lessabundant.Table I ; Main ingredients in various types ores hosting at theore-deposit KremikovtziType ore Assay, wt.%Fe BaSO4 Mn Pb SiO2 CaOHematite 48 . 2 9.9 1.1 0 . 21 3.84 3.18Siderite 21 . 6 17.0 5 .2 0.75 8 . 86 5.57Limonite 31.5 18.9 7.7 0.64 6.50 3.08Barite raw material 12.4 30.4 2.5 1.21 9.6 15.9Lead 9.5 8.2 2.6 1.20 4.3 26.1MARKETS , QUALITY AND PRICES OF BARITEThe flotation barite concentrate produced from Kremikovtzi ore-deposit wasexported to former USSR , Romania , Hungary and Albania in a bulk . Recently,a new market having strong requirements to the product quality has been devel-223A. HAU.l/F.V et al.oped . The quality is determined depending on the barite application ', by follow-ing characteristics:- Physical: density, whiteness , particles size;- Chemical : max. content (wt.17c) of' Fe,OV AI,O., SiO , as quartz, CaF,,TiO„ sulfides, soluble alkalis, moisture and heavy metals ( in ppm).According to Industrial Minerals '', midyear ( 1998) international prices wereas follows:API, lump, c.i.f. (cost, insurance, and freight) [USI Gulf Coast, Chinese.$50 to $52, Indian, $52 to $54, Moroccan, $52 to $54;Unground. OCMA/API, hulk, specific gravity 4.2. f.o.b. (free on hoardMorocco. $42 to $44 per ton;Ground, bagged, specific gravity 4.22, f.o.b. Morocco, $75 to $85 per tonGround, OCMA/API, big bags (1.5 tons) f.o.b. South Turkey, $64 to $68per ton;Ground, OCMA, bulk, delivered Aberdeen, United Kingdom [UK], $84.14to $91.45 per ton, delivered Great Yarmouth [UK], $94.44 to $108.08 perton;- Micronised, off white minimum 99%/c, less than 20 micrometers deliveredUK, $232.78 to $249. 40 per tonGround , white, paint grade , 96-98 wt.`h BaSO4, 350 mesh, 1-5 tons de-livered UK, $324 to $365.79 per ton.TECHNOLOGY FOR PRODUCTION OF BARITE CONCENTRATETechnological scheme for production of barite concentrate from ferrous oresand raw harite materials in Kremikovtzi ore-deposit is shown in Fig. I. Thisflow-sheet was developed based on investigations carried out in Bulgaria and inother countries'' " ". A version has been chosen from all possible technologicalschemes containing optimal particles size, 100 wt.% -0.5 nom for high gradientmagnetic separation.The ferrous minerals are recovered first of all according to the selected scheme.The opposite sequence is applied for the barite raw materials. The barite isrecovered prior at the optimal particle size l'or its flotation. The development ofa technological process for heneficiation of barite raw materials is under way.The introduction of high intensity magnetic separation for recovery of ferrousminerals from the residue of barite flotation is conceived. The high gradientmagnetic separation is carried out by means of two separators type Jones DI' 3 17and barite flotation by means of pneumatic-mechanical flotation machines. typeDenver D-R.2241!•1b^., WL Oi 6rnn,,I i .14r -..r i Y4 " H .NWwi 1, . 14 0 I.146 M nrM. INNM^IM^1Y rMiM YlWinu^ rA. HAT)JIEV et al.The various types of complex ferrous ores have to he charged according tothe following correlation''"I (in wt.%'): limonite 62, siderite 23, and hematite 15.Complimentary conditions for mining are completed by simultaneous processingof harite raw materials both with complex ferrous ores. Data for the iron andbarium sulfate assay in the feed of barite flotation are shown in Tables 2 and 3.Table 2 : Iron distribution in the feed of barite ,flotationIron assay,wt.%Mean iron assay,wt.°%cPercent towards totalnumber of cases<20 19.80 3.3320 - 21 21.00 41.6721 - 24 23.00 40.0024 - 26 25.00 1 1 .67<26 26.10 3.3322.43 100.00Table 3 : Barium distribution in the feed of barite. flotationBaSO4 assay,wt.%Mean assay of BaSO4,wt .%Percent towardstotal number of cases28 - 30 29.00 25.3330 - 32 31.00 36.0032 - 34 33.00 17.3334 - 36 35.00 10.67< 36 38.25 10.6732.04 100.00As it can he seen that data oscillate in a wide range, as for the iron the contentis 21-23 wt.o% in 81.67 17c of cases. Contents of 28-34 wt.% are located at thefrequency of 78.66 % in cases for barium sulfate. Manganese, SiO„ CaO, MgO.AI,O,, lead and other components are also presented in the charge for flotationof barite influencing the grade of barite concentrate according to their contents.The geographical situation of producers and consumers of barite in the world-provide definite benefits for Bulgaria on the markets for barite concentrate usedby the chemical industry in Western Europe.Data for BaSO4 content in the harite concentrate produced from raw materialswith mean iron assay of 22.43 wt. 17( and BaSO332.04 wt.17, (sec Tables 2 and3) are presented in Table 4. The content of BaSO4 4 in the concentrate is higher226A. HADJIEV et ui,than 97 wt.% in 53.09 % of the cases and lower than 95 wt.%o in 1.23 % of thecases. The mean is 96.88 wt.%. There is not detected any content of CaF, in theconcentrate. The content of Ba(Sr)SO; in the high-grade barite concentrate hasto achieve 97 wt.% min., according to the requirements of the Solvay BariumStrontium Group GmbH. The content of SrSO4 in the produced barite concen-trates quantified 1.4 wt.%o,Table 4 : Barium distribution in barite concentrateBasSO4 inconcentrate , wt.%Mean of $asSO4 inconcentrate , wt.%Percent towards totalnumber of cases95 94.89 1.2395 - 97 96.59 45.68> 97 97.17 53.0996.88 100.00The production of a high grade barite concentrate is carried out the follow-ing conditions: particle size 65-70 wt.% -0.074 mm after grinding; solid phasein under rougher barite flotation 34 %; temperature of the pulp in the rougherbarite flotation 26-30°C; pH of the pulp in the rougher barite flotation 8-9. Thereagents dosage is as follows: collecting agent OMC 199 and AERO 845 in theratio 2: 1, at total consumption rate of 400-450 g/t. Feeding point: conditioningbefore rougher flotation, first and second scavenging and in case of need firstcleaner flotation. Frother: OrePrep F501; dosage 10-15 g/t during main flotationand in case of need in the first cleaner flotation. Depressant: water glass (Na,SiO,),total dosage 4-4.5 kg/t. Feeding point: conditioning before rougher flotation andin the first , second and third cleaner flotations.Information concerning quality of barite concentrate produed according to theconsidered technological regulations is shown in Table 5. The requirements ofthe barite concentrate for chemical industry" are also given in this table forcomparison. The Fe,O, content is higher but in return for this SiO, is many timeslower than admissible.The high grade barite concentrate can be produced only by the using collectorOMC 199 or the usage of collectors AFRO 840 and 845 in the ratio 1 :1. Thefrother Ore Prep F501 is used in the first case and the AEROFROTH 65 and 70in the second case. Water glass is added as a depressant in both cases.The production of barite concentrate according to the OCMA and API re-quirements is not accompanied by troublesome difficulties. In this case part ofreagents OMC 199 and AERO 840 and 845 and substituted by potassium oleate.227n^ ^rralni.r iMWYiIM1^WxM ^Mln nln IIWNIi i1M nFMHM1^NiiYRM11k^1^A. HADJ/FV et a!.The filtered harite concentrate is dried, ground and Nagged in bags 25 and 50 k`gor in I and 1.5 tons hi- hags. The recently assembled plant type POAMII. PM16 can he used in full capacity, due to the shortage of markets for concentratewith quality characteristics according to the requirements of OCMA/API.Table 5 . Chemical contpositiori of the high-grade flotcrtiorr cortc•entrate amlr-equirerne rrts of chemical irrdustrvComponents Assay. wt.%Concentrate Requirements' 'BaSO4 97.08 <95.00SiO, 0.44 <2.50Fe,O 00.60 <0.15CaO 0.44 0.05 -MnO 0.91Pb 0.07 -CaF, - < I.00ENVIRONNIENTAL PROTECTIONWastewater from the power plant is used in the ore dressing plant. Theapplied organic reagents in the flotation are biodegradableWastewatersettling is carried out in the tailing pond. A part of purified water is recycled inflotation plant. Water from agglomeration plant is also discharged to the tailingpond. The surplus water is used for industrial water supply of metallurgicalworks. The effectiveness of dust collecting equipment at drying. grinding andpacking installation reaches 99.99 17c.CONCLUSIONThe high grade flotation concentrate containing 77-95 wt.'/( Ba(SOSO, isproduced from complex ferrous ores containing hematite. siderite. barite andother minerals aimed for chemical industry. The production of harite concentratewith quality according to the requirements ofOCMA/API is limited because ofshortage of suitable markets.RE.FERF,NCESPushkarov, A.. N. Petrov. R. Georgiev. (1977). Some problems of cannplcc utilir_.r-tion of Kremikovtzi ore", Annual NIPRORUDA. vol. Rudodohi\ i Ohogatiavanc.p. 218 (in Bulgarian).22}{A. HAI).IIF, V et al.2. Apostolov, D., (1994), Technological and technical feasibility for improvement ofmanufacture and quality of barite concentrate. Potential range expanding of oredressing plant, Proceedings of Barite Conference. Kremikovtzi, p.l (in Bulgarian).3. Yovchev, Y., (1961), Mineral Resources of P.R. of Bulgaria, Sofia, Technika, FerrousMetals, 14 (in Bulgarian).4. Benov, B., (1994), Status of reserves and barite recovery from ore-depositKremikovtzi, Proceedings of Barite Conference, Kremikovtzi, p. 1 fin Bulgarian).5. Damyanov, Z., (1994), Mineralogical prerequisites for selective processing ofKremikovtzi siderite ores, Minno delo i Geologia Journal, 4-5, p. 48 (in Bulgarian).6. Ratiev, L., Z. Damyanov, (1995), Geochemical features of Kremikovtzi siderite Ore,Minno Delo i Geologia Journal, 5, p. 5 (in Bulgarian).7. Albony, L. (1993), Mement ruches et mineraux industriels. La barytine, RapportBRGM R 3775 DMM-RMI, p. I (in French).8. Searls, J., (1998), Barite. US Geological Survey Publications, p. 1 1 .9. Georgiev, R. et at.. (1977), Techno-economic feasibility study on mineral processingof iron ore from ore-deposit Kremikovtzi, Proceedings of Second Balkan Confer-ence on Mineral Processing, Baia Marc, Romania , p. 218 (in Russian).10. Petrov, P. et al., (1977), Mineral processing of rough ore from ore-deposit Kremikovtziby means of flotation, Proceedings of 4th National Conference on Metallurgy ofFerrous Metals, Sofia, vol. 1. (in Bulgarian).11_ Georgiev, R. et al., (1977), Mineral processing of Kremikovtzi ore by means of highgradient magnetic separation, Proceedings of 4th National Conference on Metal-lurgy of Ferrous Metals, Sofia, vol. 1. (in Bulgarian).12.. Hadjiev, P. et al., (1980), Dewatering of barite concentrate , Bulletin , 4, NIPRORUDA,p. 10 (in Bulgarian).13. Georgiev, R. et al., (1981), Pilot-plant scale high gradient magnetic separation andflotation researches on limonite ore, Annual of NIPRORUDA, vol. Mineral Tech-nologies, p. 206 (in Bulgarian).14. Hadjiev, P. et al., 1981), Dewatering of iron concentrate output by pilot-plant scalehigh gradient magnetic separation , Rudodobiv Journal, 2 (in Bulgarian).15. Hadjiev, P., K. Groseva-Murhova, R. Videnov, (1981-1982), Some aspects on theusage of surface-active agents supporting filtration of barite concentrate, Annual ofthe Higher Institute of Mining and Geology. vol. XXVIII, part IV, p. 95 (in Bulgar-ian).16. Hadjiev, P., K. Groseva-Murhova, (1981-1982), Pilot-plant trials on dewatering ofiron and barite concentrates, Annual of the Higher Institute of Mining and Geology,vol. XXVIII, p. 103 (in Bulgarian).17. Hadjiev, P., K. Groseva-Murhova, (1983), Study of the effect of some reagents ondewatering of iron concentrate, Comptes Rendus 30 years Higher Institute of Miningand Geology, p. 21 (in Bulgarian).229YY!^^l4^Yw♦MMWIh^^i lM tltlPM!WxIM^Mi^^F^YY I^eY^Wlh! ^MYY ^Y...i ^^^^i Yl^^^IY^IIY^+^I1^IbdM IN I^Ii^IY^^^n+1W4e/rMALEXANDER HADJ/F_V e>r erl.I. Hadjiev R. K. Groseva-Murhova, ( 1984-I985), Conditioning of waste water dis-charged by ore dressing plant processing rough ferrous ore from deposit Kremikovtzi.Annual of the Higher Institute of Mining, and Geology. vol. XXXI. part IV, p?3?(in Bulgarian).19. Georgiev R., ( 1994). Effect of the poly`gradient magnetic separation in the Kremikovtzisiderite ore, Minno Delo i Geolo_ia Journal, 2, p.42 (in Bulgarian).20. Apostolov D., (1994), Improving the tcchnolog,y by polygradient magnetic separa-tion in the ore dressing process of Kremikovtzi ores. Minno Delo i GeoloLlia Journal,3, p.16 (in Bulgarian).21. Hodge B., (1999). Mitring Journal, Industial Minerals. Annual Review, Barite. p.382.22. Mining Chemicals Handbook. CYANAMID 1989, p. 1.23. Chernical Specialties for Mining, Handbook 1991.230

Flotation of Barite From Complex Iron Ore

http://eprints.nmlindia.org/2916/1/222-230.pdf

Flotation of Barite From Complex Iron Ore

Abstract

Similar works

Full text

Available Versions

eprints@NML