Abstract

Studies have been conducted to establish the patterns of sulfuric acid dissolution of metal sulfides in the presence of environmentally friendly oxidizing agents, ozone and iron(III) ions; determine the parameters and modes of intensified extraction of metals into solution; reduce the consumption of oxidizing agents; and develop the least environmentally intense and most cost-effective methods for the extraction of nonferrous metals from sulfide ores, concentrates, and industrial wastes. A copper sulfide concentrate with a grain size of 0.074 mm (90%) and a copper content of 24.5% obtained by the flotation concentration of ore from the Udokan deposit and ozone with a concentration of 80–180 mg/L in a mixture with oxygen are used for the study. The concentrate is fed into a stirred reactor at a rate of 1–5 mL/s. Patterns are studied within the sulfuric acid concentration range 20–100 g/L and a Fe(III) ion concentration of 7.8–29.2 g/L at a solid phase to liquid phase ratio 1.1–1.5 at a temperature of 18–60°C. It has been established that the use of Fe(III) ions and ozone can significantly intensify the recovery of copper from sulfides in sulfuric acid solutions. The extraction of copper from sulfides increases in proportion to the 2.4-fold increase in the concentration of Fe(III) from 7.8 to 29.25 g/L. Ozone effectively oxidizes Fe(II) and regenerates the oxidizing agent, Fe(III) ions. With an increase in the temperature and iron concentration, the consumption of ozone for oxidation increases; namely, 0.22 mol of O₃ is consumed per 1 mol of Fe, which is higher than a theoretical value of 0.17. An increase in the rate of the ozone-assisted extraction of copper from sulfides is achieved by increasing the temperature from 20 to 50°C (by 1.4 times), the concentration of ozone from 85 to 180 mg/L (3 times), the feed rate of the ozone–oxygen gas mixture from 1 to 5 mL/s (2.7 times at 20°C and 3.9 times at 50°C), and by the addition of Fe(III) ions by ~1.5 times at 50°C and [Fe(III)] = 10 g/L. The largest oxidizing activity in the sulfuric acid solution is provided by ozone decomposition products at a temperature of 50°C when the solubility of ozone decreases. The ozone utilization coefficient and specific ozone consumption rate for extracted copper decrease with an increase in the feed rate of the ozone–oxygen gas mixture from 1 to 5 mL/s by 1.42 times at 20°C and by 1.16 times at 50°C and increase with an increase in the temperature and concentration of Fe(III) due to the rapid decomposition of ozone and its unproductive use for the oxidation of iron.

中文翻译：

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臭氧和铁离子强化硫化物精矿中铜的硫酸浸出

摘要

已经进行了研究以建立在环境友好的氧化剂，臭氧和铁（III）离子存在下金属硫化物的硫酸溶解模式；确定强化金属萃取到溶液中的参数和方式；减少氧化剂的消耗；并开发出对环境影响最小，最具成本效益的方法，以从硫化矿石，精矿和工业废料中提取有色金属。浮选铀矿中的矿石和浓度为80-180 mg / L的臭氧，通过浮选浓缩了粒径为0.074毫米（90％），铜含量为24.5％的硫化铜精矿用于研究。将浓缩物以1-5 mL / s的速度送入搅拌的反应器中。在18–60°C的温度下，在固相与液相之比为1.1–1.5的硫酸浓度范围为20–100 g / L和Fe（III）离子浓度为7.8–29.2 g / L的条件下研究模式。 。已经确定，使用Fe（III）离子和臭氧可以显着增强硫酸溶液中硫化物中铜的回收率。从硫化物中提取铜与Fe（III）浓度从7.8增加到29.25 g / L的2.4倍成正比。臭氧有效地氧化Fe（II）并再生氧化剂Fe（III）离子。随着温度和铁浓度的增加，用于氧化的臭氧消耗增加；即0.22 mol的O 5在18–60°C的温度下。已经确定，使用Fe（III）离子和臭氧可以显着增强硫酸溶液中硫化物中铜的回收率。从硫化物中提取铜与Fe（III）浓度从7.8增加到29.25 g / L的2.4倍成正比。臭氧有效地氧化Fe（II）并再生氧化剂Fe（III）离子。随着温度和铁浓度的增加，用于氧化的臭氧消耗增加；即0.22 mol的O 5在18–60°C的温度下。已经确定，使用Fe（III）离子和臭氧可以显着增强硫酸溶液中硫化物中铜的回收率。从硫化物中提取铜与Fe（III）浓度从7.8增加到29.25 g / L的2.4倍成正比。臭氧有效地氧化Fe（II）并再生氧化剂Fe（III）离子。随着温度和铁浓度的增加，用于氧化的臭氧消耗增加；即0.22 mol的O 25克/升。臭氧有效地氧化Fe（II）并再生氧化剂Fe（III）离子。随着温度和铁浓度的增加，用于氧化的臭氧消耗增加；即0.22 mol的O 25克/升。臭氧有效地氧化Fe（II）并再生氧化剂Fe（III）离子。随着温度和铁浓度的增加，用于氧化的臭氧消耗增加；即0.22 mol的O₃每1摩尔Fe消耗的金属量高于理论值0.17。通过将温度从20升高到50°C（1.4倍），将臭氧浓度从85升高到180 mg / L（3倍），将臭氧从硫化物中提取铜的速率提高。臭氧-氧气混合气的进料速度为1至5 mL / s（在20°C下为2.7倍，在50°C下为3.9倍），并且在50°C下通过添加Fe（III）离子〜1.5倍并且[Fe（III）] ＝ 10g / L。当臭氧的溶解度降低时，在50°C的温度下，臭氧分解产物可提供硫酸溶液中最大的氧化活性。提取的铜的臭氧利用率系数和比臭氧消耗率随着臭氧-氧气混合气进料速率的增加从1到5 mL / s降低1。