CAJ | 학술논문

以燕麦秸秆为还原剂，在硫酸介质中直接浸出某低品位软锰矿，研究浸出过程的工艺条件和动力学。结果表明：在硫酸浓度为150 g/L、液固比为9 mL/g、麦秆与软锰矿质量比为0.3、浸出温度90℃、浸出60 min的条件下，锰浸出率可达96.1%，此时，铁浸出率为46.8%，浸出液化学需氧量(COD)值为6.2 g/L。动力学研究表明：锰的浸出过程在333~363 K内符合未反应核缩减模型，浸出过程主要受界面化学反应步骤控制，其浸出表观活化能为69.4 kJ/mol。
이연맥갈간위환원제，재류산개질중직접침출모저품위연맹광，연구침출과정적공예조건화동역학。결과표명：재류산농도위150 g/L、액고비위9 mL/g、맥간여연맹광질량비위0.3、침출온도90℃、침출60 min적조건하，맹침출솔가체96.1%，차시，철침출솔위46.8%，침출액화학수양량(COD)치위6.2 g/L。동역학연구표명：맹적침출과정재333~363 K내부합미반응핵축감모형，침출과정주요수계면화학반응보취공제，기침출표관활화능위69.4 kJ/mol。
The extraction of manganese from low-grade pyrolusite ore was investigated using oat straw as a reducing agent in dilute sulfuric acid medium. The optimal conditions and the kinetics from manganese dioxide ores by reductive leaching were discussed. The results show that the leaching rate of manganese reaches 96.1%while the iron dissolved is 46.8%and chemical oxygen demand (COD) is 6.2 g/L under the optimal condition as follows, H2SO4 concentration of 150 g/L, liquid-to-solid ratio of 9 mL/g, mass ratio of oat straw to pyrolusite ore of 0.3, leaching time of 60 min at 90℃. The kinetics studies indicate that the leaching process follows the shrinking-core model in the temperature ranging from 333 K to 363 K, the leaching rate of manganese is controlled by the interface chemical reaction during the leaching process, and the apparent activation energy is 69.4 kJ/mol.