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Chalcopyrite Alkali Smelting Pretreatment-Low Temperature Pressure Leaching Process
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A technology of pressure leaching and pretreatment, applied in the direction of improving process efficiency, can solve the problem of high total pressure, and achieve the effect of solving the problem of leaching and passivation
Inactive Publication Date: 2016-04-13
JIANGXI UNIV OF SCI & TECH +1
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Chinese patent ZL200910115866.6 discloses thermally activated pretreatment of complex copper sulfide ores with chalcopyrite and tetrahedrite as main minerals, and then pressurized leaching in a sulfuric acid system. Although the leaching temperature can be significantly reduced to 180°C, the The temperature is still high, and the total pressure is also high by about 1.8MPa
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Embodiment 1
[0060] Chalcopyrite was exposed to Na under the protection of nitrogen 2 CO 3 Melting pretreatment, Na 2 CO 3 The dosage is 5% of the concentrate weight, the smelting temperature is 500°C, and the smelting time is 1.0h. In this process, no volatilization loss of sulfur is seen, and no SO is produced 2 and other harmful gases.
[0061] In the pressure leaching process, the leaching temperature is 110°C, the leaching time is 3.0h, the oxygen partial pressure is 0.6MPa, the initial sulfuric acid concentration is 1.6mol / L, the liquid-solid ratio mL / g is 5 / 1, and the stirring speed is 550r / min. Under the above leaching conditions, the copper leaching rate was 47.58%.
Embodiment 2
[0063] Chalcopyrite was exposed to Na under the protection of nitrogen 2 CO 3 Melting pretreatment, Na 2 CO 3 The dosage is 30% of the concentrate weight, the smelting temperature is 800°C, and the smelting time is 3.0h. In this process, no volatilization loss of sulfur is seen, and no SO is produced 2 and other harmful gases.
[0064] In the pressure leaching process, the leaching temperature is 110°C, the leaching time is 3.0h, the oxygen partial pressure is 0.6MPa, the initial sulfuric acid concentration is 1.6mol / L, the liquid-solid ratio mL / g is 5 / 1, and the stirring speed is 550r / min. Under the above leaching conditions, the copper leaching rate was 94.09%.
Embodiment 3
[0066] Chalcopyrite was exposed to Na under the protection of nitrogen 2 CO 3 Melting pretreatment, Na 2 CO 3The dosage is 20% of the concentrate weight, the smelting temperature is 800°C, and the smelting time is 3.0h. In this process, no volatilization loss of sulfur is seen, and no SO is produced 2 and other harmful gases.
[0067] In the pressure leaching process, the leaching temperature is 80°C, the leaching time is 1.0h, the oxygen partial pressure is 0.2MPa, the initial sulfuric acid concentration is 1.0mol / L, the liquid-solid ratio mL / g is 5 / 1, and the stirring speed is 550r / min. Under the above leaching conditions, the copper leaching rate was 42.34%.
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Abstract
The invention provides a chalcopyrite alkali-smelting pretreatment-low-temperature pressure leaching process. The process comprises the following steps: 1) alkali-smelting pretreatment: adding a certain amount of alkali into chalcopyrite and smelting for certain time at a certain temperature; 2) low-temperature pressure leaching: leaching the pretreated chalcopyrite in a sulfuric acid system at the certain temperature and under a certain pressure and an initial sulfuric acid concentration. As the method is adopted, the problem of low-altitude pollution caused by SO2 is avoided; the process is clean and environment-friendly. After the chalcopyrite is pretreated, although the chalcopyrite is also the main existence form of copper, the crystal lattice structure of the chalcopyrite is changed obviously; the chalcopyrite can be efficiently and directly leached under a low-temperature condition, and the copper leaching rate is improved to 90%. Thus, the difficult problem of leaching passivation of the chalcopyrite is effectively solved.
Description
technical field [0001] The invention relates to the technical field of wet smelting of complex copper sulfide ores, in particular to a chalcopyrite alkali smelting pretreatment-low temperature pressure leaching process. Background technique [0002] With the gradual depletion and complexity of copper resources around the world and the continuous improvement of environmental protection requirements for the copper smelting process, research on hydrometallurgy technology has become increasingly active. In complex copper sulfide minerals, copper mostly occurs in the form of chalcopyrite, while primary chalcopyrite has a stable structure and is difficult to decompose. In order to overcome the problem of leaching passivation and increase the leaching rate, direct leaching of chalcopyrite often requires high temperature and high pressure conditions (T≥220°C, P≥3.0MPa). [0003] In order to reduce the leaching temperature and pressure of chalcopyrite, many studies have proposed roa...
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