Synthesis And Application Of Alkyl Xanthate Series Of Pharmacy

Though xanthate, the traditional sulfide ores collector, is effective in collecting ability, its selectivity is not good. Hence it is necessary to improve the structure of xanthate and develop new type of sulfide ores collectors of high flotation properties.In this paper the chlorinated hydrocarbon (ethyl chloroformate, allyl chloride, benzyl chloride) were chosen as raw materials to react with alkyl xanthate in the aqueous solution. Three series of alkyl xanthic esters (alkyl xanthogen ethyl formate, allyl esters of alkyl xanthate, benzyl esters of alkyl xanthate) were prepared. The effects of reaction temperature, reaction time and molar ratio of reactants on yield were studied. The experiment results showed that the optimum technical parameters for the synthesis of alkyl xanthogen ethyl formate are 25 ℃ (reaction temperature)., 4.0hr(reaction time) and 1.05:1.00(molar ratio of xanthate to ethyl chloroformate). The optimum technical parameters for the synthesis of allyl esters of alkyl xanthate are 45 ℃ (reaction temperature),4.0hr (reaction time) and 1.05:1.00 (molar ratio of xanthate to allyl chloride). And for the synthesis of benzyl esters of alkyl xanthate, the optimum technical parameters are 55 ℃ (reaction temperature. 6hr(reaction time) and 1.10:1.00(molar ratio of xanthate to benzyl chloride). In the optimum technical conditions, the yield of isopropyl xanthogen ethyl formate is 93.76 %. The yield of allyl esters of isopropyl xanthate in the optimum technical conditions is 85.51 %. And the yield of the benzyl esters of isopropyl xanthate in the optimum technical conditions is 91.86%. The analysis has been done of the products using some physical measures such as the refraction index, ultraviolet spectrum, infrared spectrum. The results showed that the synthesized products are the aimed products.Then the copper sulfides of Dexing were adopted for investigating the flotation properties of the synthesized products. The results showed that all the synthesized products have good collecting ability. And threeseries of alkyl xanthic esters, especially the series of benzyl esters of alkyl xanthate, are superior to butyl xanthate in selectivity. Using benzyl ester of butyl xanthate as collector in the closed flotation circuit of Dexing copper sulfides, We have acquired the ideal separation indexes which are superior to that of the butyl xanthate. The copper concentrate grade of the product is 6.95% (about two percent higher than that of the butyl xanthate) and the copper recovery of the product is 91.44% (about one percent higher than that of the butyl xanthate). As a new type of sulfide ores collectors of high flotation properties, the benzyl esters of alkyl xanthate are likely to be used successfully in the flotation industry.