Acid leaching is the technical hub of the process by leaching copper oxide with dilute sulfuric acid. This process should grasp the following points:
(1) Acidity and acid consumption. The higher acidity of the leaching rate of copper when pH <1.5, the impurities in this case a sharp increase in acid consumption; if pH> 2.5, although the impurity acid consumption is small, but the copper leaching rate, and Fe3 + has started at this time the hydrolysis natural hydrocolloid Fe(OH)3 brings difficulties to the subsequent filtration, so in general, the leaching should be done in batches, and the pH value is always in the range of 1.5 to 2.
(2) Stirring and temperature. Moderate stirring can accelerate the mass transfer process is performed, the progress of the reaction rate, but too strong stirring of the slurry may affect the settling and filtration, or may take the low-speed stirring was interrupted. Advantageously copper leaching temperature progress, nothing more will also increase the leaching of impurities, and consume large amounts of energy, the leaching temperature is generally maintained at 25 ~ 30 ℃ appropriate. In winter, the steam can be properly introduced into the hot steam, which not only acts as a heating and heat preservation function, but also acts as a stirring.
(3) Leaching time. Leaching time is dependent on the content of copper in the ore mineralogy and impurities. With the leaching time prolonged, the copper leaching rate is improved, but the impurity competition and dissolution are also enhanced, the acid consumption is increased, and considering the influence on the subsequent homework, the final leaching time is finally determined. Usually, the acid immersion time is controlled for 1 to 2 hours.
The filtration process after leaching should be carried out by means of insulation, otherwise the temperature reduction of copper sulphate will precipitate fine crystals due to the decrease in solubility, which will clog the filter cloth. After the filter cake is washed 1 or 2 times with water, it is treated appropriately according to the comprehensive recovery value. The lotion is returned to the leaching after acid.
Acid leaching is the technical hub of the process by leaching copper oxide with dilute sulfuric acid. This process should grasp the following points:
(1) Acidity and acid consumption. The higher acidity of the leaching rate of copper when pH <1.5, the impurities in this case a sharp increase in acid consumption; if pH> 2.5, although the impurity acid consumption is small, but the copper leaching rate, and Fe3 + has started at this time the hydrolysis natural hydrocolloid Fe(OH)3 brings difficulties to the subsequent filtration, so in general, the leaching should be done in batches, and the pH value is always in the range of 1.5 to 2.
(2) Stirring and temperature. Moderate stirring can accelerate the mass transfer process is performed, the progress of the reaction rate, but too strong stirring of the slurry may affect the settling and filtration, or may take the low-speed stirring was interrupted. Advantageously copper leaching temperature progress, nothing more will also increase the leaching of impurities, and consume large amounts of energy, the leaching temperature is generally maintained at 25 ~ 30 ℃ appropriate. In winter, the steam can be properly introduced into the hot steam, which not only acts as a heating and heat preservation function, but also acts as a stirring.
(3) Leaching time. Leaching time is dependent on the content of copper in the ore mineralogy and impurities. With the leaching time prolonged, the copper leaching rate is improved, but the impurity competition and dissolution are also enhanced, the acid consumption is increased, and considering the influence on the subsequent homework, the final leaching time is finally determined. Usually, the acid immersion time is controlled for 1 to 2 hours.
The filtration process after leaching should be carried out by means of insulation, otherwise the temperature reduction of copper sulphate will precipitate fine crystals due to the decrease in solubility, which will clog the filter cloth. After the filter cake is washed 1 or 2 times with water, it is treated appropriately according to the comprehensive recovery value. The lotion is returned to the leaching after acid.
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