K145 2-I om-I ) 5 . 6~1 0~ 5 07 1 . I 4.3~1 O2 phys. stat. sol. 24, K145 (1967) Subjeot olassirioation: 8 and 15; 5; 14.3; 22 Institute of Physics, Academy of Sciences o r the Azerbaidzhan SSR, Baku On Some Characteristics of Chromium Selenides BY V.A. IVANOVA, D.SH. BBDINOV, and G.M. ALIEV The lattice constant and electrical conductivity of some chromium selenides are studied in the works (1 to 3), but data on the thermal conductivity and thermoelectric power of the named compounds &we absent in literature. As these data give valuable information about the kinetic processes taking place in materials we have synthesized the compounds CrSe, Cr7Se0, Cr3Se4, and Cr Se electrical and thermal conductivity and thermoelectric power.(1 to 3). The phase composition was determined with the aid of X-rays and microscopical analysis.
S ha r t Not e s K2 3 phys. stat. sol. 24, K23 (1967) Subject c l a s s i f i c a t i o n : 14.3; 5 ; 8 ; 15; 22.8 I n s t i t u t e of Physics, Academy of Sciences of t h e Azerbaidehan SSR, Baku Some Structural, E l e c t r i c a l , and Thermal Parameters of VCr,SeqS FeCr2Se,., and NiCr2Se,. Ternary Compounds BY V.A. IVANOVA, DaSHo ABDINOV, and G o M o ALIEV P r a c t i c a l l y f i l l e d d -o r b i t a l s of atoms o f t h e t r a n s i t i o n metals may i n t e r a c t (1). I n the works (2, 3) t h i s i n t e r a c t i o n of d -o r b i t a l s w a s used f o r t h e explanation of t h e e l e c t r i c a l properties of t h e t r a n s i t i o n metal compounds with M i A s structure and it w a s shown that i n compounds of C r , Mn, Pe, Co, and N i semiconductivity may be expected when the r a t i o c/a i n t h e l a t t i c e i s near t o t h e i d e a l one (1.63).
ALCOHOLSUDC 622.765.06Nonionic compounds of relatvely low molecular weight and with a small number of hydrophilic groups can have a marked effect on the selective flotation of nor.sulfide minerals from ores by carboxylic acids. The range of such compounds includes hydroxyethyl carboxylic acids [1], hydroxyethyl aliphatic alcohois, alkanolamides of carboxylic acids [2], hy~oxyechyl alkyIphenols [3], and the complexes formed from these nonionic compounds and high-molecular substances [4,5].Aqueous emulsions or suspensions of such compounds can have a hydrophilizing effect when added to a pulp, owing to specific sorpton (on the surface) of hydrophobicized (orsubsequenfly hydrophobicized) minerals of u~e ore by carboxyHc acid. Owing to the different degrees of surface hydrophilization, effective selective flotation of one of the minerais becomes feasible. The dimensions of the flotatonaggreg~es(aeroflocculi) formed in the pump decrease and thek content of selectively floamble mineral increases. The mineralized froth formed has all the propertes of flocculated froths [6].Owing to the changes which they cause in dispersed flotation systems, these reagents have been called deflocculants. It has been found that deflocculants do not have selec~ve properties. At high consumptions (0.25-1 kglr we observe in some cases the appearance of froth-forming properties without a marked yield of the floatable producr. The high conmnt of hydrophUic groups in the deflocculant molecule leads to undesirable froth formation and loss of selectivity.The present paper deals with the flotation properties of nonionic compounds obtained by esterification of carboxylic acids and Polyhydric aliphatic alcohols. In a previous paper [8] we suggested that the commercially important esrerificaton product s [7] were suitable for selective flotation of apatite from ores with various mineralogical compositions.Esterificatlon was performed by heating a mixture of 1.2 moles of alcohol and 1 mole of carboxyli c acid in nitrogen at 140-170" in ~he presence of phosphoric acid as catalyst (1-2 wu~o of the reaction mass) [9,10]. Esterification was considered complete when the reaction mass had minimum acid number and the product employed directly for flotation as aqueous 1~ emulsions or suspensions; to prepare these, 30 mg of soda Per 100 ml of solution was added. Table 1 gives the esters thus obtained.From ~be values of their este~ numbers, the esteRfication products can be considered as monoesters of dehydrated alcohols or as mixtures of mono-and diesters.For the flotation experiments we used the nonmagnetic fraction of Kovdor iron ore, containing mainiy apa~m, carbonates, forsterite and mica (Table 2); it is therefore an apatim-carbonam ore [5,11]. In the nonmagnetic fracton, crushed to flotation size (Table 3), chemical and mineralogical analysis dam reveal a smady increase in the carbonate content in u~e fine classes as we go from the +0.3 to the 0.05 mm material The apatire content in u~e +0.3 and +0.2 mm mamzial is low and the other size classes contain ...
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