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| Study on separation of arsenic from black copper slag by oxidation and alkali leaching |
| Received:June 29, 2018 Revised:April 22, 2019 |
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| DOI： |
| KeyWord:black copper mud, alkali leaching, dearsening, H2O2 |
| Author | Institution |
| yaoxiayan |
西北矿冶研究院 |
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| Abstract: |
| In order to achieve high efficiency and low cost separation of arsenic from black copper mud, H2O2 and air are used as oxidants, the effect of H2O2 and NaOH concentration and addition mode, leaching temperature, liquid - solid ratio and reaction time on the dearsenation of black copper mud from alkaline leaching of H2O2 under atmospheric pressure was studied by single factor test. The experimental results show that the reaction process of oxidation alkaline leaching of black copper mud is controlled by 3 steps: external diffusion, internal diffusion and interfacial chemical reaction, and the suitable reaction conditions are as follows:the reaction temperature is 80 ℃, the ratio of liquid to solid is 10:1 (mL/g), and the reaction time was 6 h. In the meantime, Continuously through the air with 0.1 MPa pressure. 30% of H2O2 and NaOH should be divided into two equal parts, adding at the beginning of the reaction and 3 h after the reaction, and the addition of H2O2 in drops is 90 mL/L and 3.36 mol/L in sequence. Under this suitable condition,the leaching rate of arsenic is divided into 98.2%, but Copper, antimony and bismuth are almost not leached. After oxidation and alkali leaching, slag copper exists in the form of copper powder, and its relative content reaches 80%, which is favorable for subsequent treatment. |
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