首页> 外文会议>International mineral processing congress >INVESTIGATION OF THE EFFECT OF N-SUBSTITUENTS ON PERFORMANCE OF THIOUREAS AS SPECIAL COLLECTORS FOR COPPER SULFIDES BY AB INITIO CALCULATIONS
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INVESTIGATION OF THE EFFECT OF N-SUBSTITUENTS ON PERFORMANCE OF THIOUREAS AS SPECIAL COLLECTORS FOR COPPER SULFIDES BY AB INITIO CALCULATIONS

机译:N-取代基对硫化铜硫化铜硫脲性能影响的研究

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Using ab initio methods, the chemical parameters such as the energies and compositions of frontier molecular orbitals (FMOs) and the sulfur atom charges indicating the reactive behavior of thioureas containing different N-substituent groupings were theoretically determined. The results of the calculations indicated that the efficiencies of N-substituent thioureas depend on the investigated parameters, and the N-substituent groupings have significant effect on flotation performance of thioureas as selective collectors for copper sulfide minerals. The order of electron-donating ability is N-propyl-N′-ethyl-thiourea (PETU) > N-propyl-N′-benzyl-thiourea (PBZYTU) > N-propyl-N′-allylthiourea (PALTU) N-propyl-N′-benzoyl-thiourea (PBZOYTU) > N-propyl-N′-ethoxycarbonylthiourea (PECTU) > N-propyl-N′-acetyl-thiourea (PACTU), and the order of feedback-electronaccepting ability is PBZOYTU > PACTU > PECTU PALTU > PBZYTU > PETU. This implies that PBZOYTU, PACTU or PECTU can react with copper atoms having (t_(2g_)~6(e_g)~3Cu(II) or t~6e~4Cu(I) configuration on the surfaces of copper sulfide minerals through normal covalent bond and back donation covalent bond, but the interaction of PBZOYTU, PACTU or PECTU with iron atoms having t_(2g))~6(e_g)°Fe(II) or (t_(2g)~a)~3(e_g~a)~2Fe(III) configuration on the surface of iron sulfide minerals is weak. PBZOYTU, PACTU or PECTU should have excellent performance as flotation collectors with improved collecting power for copper sulfide minerals and selectivity against iron sulfide. The theoretically obtained results for PECTU are consistent with the experimental data reported in the literature, and the theoretical results for PBZOYTU or PACTU will be proved by flotation tests in the future.
机译:使用AB Initio方法,理论上测定了指示前部分子轨道轨道(FMOS)的能量和组成和硫原子电荷的化学参数和硫原子电荷。理论上测定了含有不同的N-取代基分子的硫脲的反应性行为。计算结果表明,N-取代基硫脲的效率取决于所研究的参数,N-取代基对硫化铜矿物的选择性收集器具有显着影响硫脲的浮选性能。电子捐赠能力的顺序是N-丙基-N'-乙基 - 硫脲(Petu)> N-丙基-N'-苄基 - 硫脲(Pbzytu)> N-丙基-N'-烯脲(Paltu) n -Propyl-n'-benzoyl-thiourea(pbzoytu)> N-丙基-n'-乙氧基羰基硫脲(pectu)> N-丙基-N'-乙酰基 - 硫脲(PACTU),以及反馈 - 电子承受能力的顺序是pbzoytu> pactu> pectu paltu> pbzytu> petu。这意味着Pbzoytu,pactu或pectu可以通过正常共价键在硫化铜矿物表面的表面上具有(T_(2g_)〜6(e_g)〜3cu(i)或t〜6e〜4cu(i)构型的铜原子并施加捐赠的共价键,但是pbzoytu,pactu或pectu与铁原子的相互作用具有t_(2g))〜6(e_g)°Fe(ii)或(t_(2g)〜a)〜3(e_g〜a) 〜2Fe(iii)在硫化铁矿物表面上的配置弱。 Pbzoytu,PACTU或PECTU应该具有出色的性能作为浮选收集器,具有改善硫化铜矿物质的收集功率和针对硫化铁的选择性。 PECTU的理论上获得的结果与文献中报告的实验数据一致,并且将来将通过浮选测试证明PBZOYTU或PACTU的理论结果。

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