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羟肟酸类捕收剂的合成及其对钛铁矿的浮选性能研究
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摘要
高效低成本低毒的浮选捕收剂的研制是钛铁矿浮选的关键,对提高我国矿产资源利用率具有重要的战略意义。论文选题来源于国家973项目“难处理金属矿高效浮选捕收剂的分子组装与合成”(编号:2007CB613602-3)。
     通过对羟肟酸捕收剂合成工艺的优化,合成了对叔丁基苯甲羟肟酸、辛基羟肟酸、苯甲羟肟酸和水杨羟肟酸等一系列羟肟酸螯合捕收剂。在醇酸比为4.5,DBSA物质的量为酸的15%的条件下,酯化反应10 h。在不除去酯化产物中甲醇和DBSA的条件下,固定羟肟化反应溶剂中水醇重量比为5,按当量酯:盐酸羟胺:碱=1:1.2:2.2的反应物摩尔配比,50℃水浴搅拌反应4 h,对叔丁基苯甲羟肟酸的合成总转化率为82.83%。改进工艺合成的羟肟酸产品无需酸化提纯可直接应用于浮选。
     采用单矿物实验考察羟肟酸捕收剂对钛铁矿、方解石、白云石及石英的浮选性能,结果表明:对叔丁基苯甲羟肟酸对钛铁矿的捕收效果最好,辛基羟肟酸次之。当对叔丁基苯甲羟肟浓度大于300 mg/L时,钛铁矿浮选回收率可以稳定在90%以上,辛基羟肟酸在达到200mg/L的浓度时,回收率在75%以上。用对叔丁基苯甲羟肟酸和辛基羟肟酸均可在矿浆pH=8时实现钛铁矿和石英的有效分离。攀枝花钛铁矿实际矿物浮选实验表明:采用改进工艺合成的羟肟酸捕收剂对实际矿物的捕收效果比羟肟酸纯品和单用传统选钛捕收剂更为显著,对攀枝花钛铁矿一步粗选的浮选回收率在84%左右,钛粗精矿品位为36%,体现出了组合用药的优势。
     采用Zeta-电位测定、红外光谱分析、矿物表面电性分析以及矿物和羟肟酸的溶液化学分析,探讨了羟肟酸与钛铁矿的作用机理。Zeta-电位测定和红外光谱分析均表明,羟肟酸阴离子捕收剂与钛铁矿之间的作用为化学吸附作用。
The development of colloctors with high efficiency, low cost and low toxicity is not only the key to flotation of ilmenit, but also the significance for the exploitation of mineral resources. The thesis stems from the National 973 Program "molecular assembly and synthesis of high efficiency collectors for difficult processing ores" (No. 2007CB613602-3).
     In this paper, a series of hydroximic acid collertors, including tert-butyl benzoic hydroximic acid, octanoic hydroximic acid, benzoic hydroximic acid and salicylic hydroximic acid, were prepared after searching and optimizing. For tert-butyl benzoic hydroximic acid, the results majorized as follow:alcohol-acid ratio was regulated at 4.5; the DBSA of 15% acid in mole as catalyst was introduced into the system and then esterificated for 10 h; the hydroxylamine hydrochloride was reacted with sodium hydroxide on condition that the ratio of equivalent ester, hydroxylamine hydrochloride and sodium hydroxide was 1:1.2:2.2; the mass ratio of water and alcohol in the hydroximation solvent was regulated at 5; without any purification, direct hydroximation sustained for 4 hours at the temperature of 50℃and the total conversion of 82.83% can be achieved. The hydroximic acids synthetized through improved process can be uesd as collectors derectly.
     The monomineral experiments of ilmenite, calcite, dolomite and quartz present that the tert-butyl benzoic hydroximic acid and octanoic hydroximic acid collectors exhibit strong flotation capability on ilmenite while the benzoic hydroximic acid and salicylic hydroximic acid exhibit weak. The recovery of ilmenite is 75% under the condition that the concentration of octanoic hydroximic acid is 200 mg/L, and the recovery can preserve over 90% when the concentration of tert-butyl benzoic hydroximic acid reaches 300 mg/L. Therefore both of collectors are available to separate ilmenite from quartz. Accordingly, the actual mineral experiment of ilmenite form Panzhihua show that the hydroximic acids synthetized through improved process exhibit better results than pure collectors including oleic acid, hydroximic acids, oxidation paraffin soap and so on. Furthermore, using the tert-butyl benzoic hydroximic acid or octanoic hydroximic acid collectors can obtain a recovery of 84% with a content of 36% going by a roughing flotation.
     The adsorption mechanism of the hydroximic acids on ilmenite has been investigated through Zeta-potential, IR spectrum measurements, surface electrical and solution chemical analysis. Zeta-potential and IR spectrum measurements confirm that the interaction between hydroximic acid collertors and ilmenit must be the chemical action.
引文
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