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41 <br /> l.i .'• 46 METAL MINING BOA It 1.ORAD0 VANADIUM <br /> 4. An important structural properly of penlavalenl <br /> vanadimn is the formation of the five-coordinated <br /> .- chain which appears between pil 2 and 8.This struc- <br /> ture motif appears to play an important rule in the <br /> formation of the mixed eanadiumf IV) and vanadi. <br /> unl(V) oxides and hydrates. <br /> 5. Carnotite covers a wide plf range of stability for 1.0 <br /> vanadium V . Pentavalenl vanadium will reci itale Navaioifeany uranium � <br /> Excess vanadiumsent nna abe carnotite <br /> ora nil tde Yo [edtlas 0.8 V20s•3Hes"o 6.9Hx01r�r'�mosona,Y <br /> '. Y temporarily P \ Pascoile� oatbn <br /> hewettile or pascoile, or bound up in a silicate mica 0.6 VneOza 4i'Ca3Vno028•16H2O <br /> or clay " VO••% .(Carnotite) <br /> (Rauvite)-(Tyuyamunile) .. z <br /> 1.4 ,n U.4 6/„ 5-VALENT <br /> Pervanadyl VOz+ \Corvusite > - - <br /> (pale yellow) Rossile <br /> 1.2 { I ' ,� I / CaV206.4H2O ,t.^ <br /> VzO5(brown) •m 02 4-VALENT �� �� (Carnotite) <br /> 1.0 5-VALENT Paramont �5� (Tyuyamunite <br /> Polyvanadate :8 roseite V02 Melano- . CaU2V2012•8H201Dutton <br /> vanadile <br /> . VtoOxe� `um4 oy y.A 0 `resite VO(OH)2 \ .; <br /> 4 0.6 Vanadyl (orange)`` �h` 'c 3-VALENT /�/ \ $imPlotile <br /> 0.4 (te) MIx ` Metavanadate`any=no`' 2 .0,2 M:°c°`ei`e p0(OH) CaV.Os•SHxO <br /> 0.2 4-VALE•NT}ra :;;: ,. (Colorless) Pyrovana-date <` r -0.4 2-VALENT <br /> 49 Vanadic ':•':' • r:.. V202 <br /> 8 a 0 ` •;' zOs.:r.., (colorless) <br /> V o r <br /> -c.:•:'':(gre.Ven-black)' + <br /> reen =% 'n 7 g g ` 10 <br /> _ ...Vanadite q o y 2 3 4 <br /> v -0.2 �i � :c'y::. .:.:;.•... V40a-2 Hydrogen-ion concentraWaterban.PH units .C O <br /> <5 -0.4 .:d4'an ::: brown) 'o`. <br /> -0.6 Va adous ???es 4sy a rhla r;�e .ti.� o ' <br /> • �. Figure 3.—Portion of the Eh-pH phase diagram of Figure 2, showing <br /> (violet) <br /> �8 °'•; ,. ; .,.. . . . positrons of various vanadium mineral species and probable alteration �� <br /> k)•'.: sequences. (U. S. Geol. Survey Prof. Paper 320, p. 101.) <br /> 2-YALFAT lac <br /> -1.0 • ' Inn southwest Colorado and adjoining parts of Utah, Arizona, and <br /> r-Vanadium metal.V• :V20z::.'. .,' . . : ` s't <br /> 1� New Mexico, sedimentary rocks are exposed ranging in age from the :. <br /> -12 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Penns)lvanian llermosa formation to the Eocene Wasatch formation: <br /> Hydrogen-Ion cerlcenUatlon,PH units <br /> '�..,;•.. ., , Figure 2.—Oxidation potential—plI phase diagram for vanadium in <br /> aqueous solutions. Stippled fields represent solids (solubility of <br /> :. ., <br /> V<0.01 mot. per 1.). Phases may be hydrated or hydrogenated to � . . ';: •.�ry <br /> an unknown degree. (U. S. Geol. Survey Prot Paper 320, p. 92.1 r:' •� �`�,',` <br /> • r <br />