某难处理高硅氧化锌矿加压酸浸工艺

以某高硅氧化锌矿为研究对象, 在加压酸性体系下, 分析了起始酸度、浸出温度、釜内压力、浸出时间及液固比等因素对锌浸出率、二氧化硅浸出率和产液速率的影响。结果表明: 在矿样粒度-0.105 mm粒级占85%以上、起始酸度90.16 g/L、浸出温度120 ℃、釜内压力1.2 MPa、浸出时间90 min、液固比5∶1、搅拌速度550 r/min的条件下, 可使锌的浸出率达到98.54%以上, 二氧化硅的浸出率低于1.02%, 产液速率不低于941 L/(m²·h)。对浸出产物进行XRD和SEM分析表明, 经历浸出过程, 浸出残渣表面相对浸出前变化很大。

Study on Pressure Acid Leaching Technique of a Refractory High Silicon Zinc Oxide Ore

The effects of initial acid value, leaching temperature, still pressure, leaching time and liquid-solid ratio on the leaching rate of Zn and SiO₂ and product liquid rate were analyzed under pressure acid system with a high silicon zinc oxide ore as the object of study. The results show that on the conditions that the ore samples in which the particle size is -0.105 mm above 85%, the initial acid value is 90.16 g/L, leaching temperature is 120 ℃, still pressure is 1.2 MPa, leaching time is 90 min, liquid-solid ratio is  5∶1 and the rate of agitation is 550 r/min, the leaching rate of Zn is 98.54% and the leaching rate of SiO₂ is below 1.02% respectively, and the product liquid rate is no less than  941  L/(m²·h). Analyses on the leaching products by XRD and SEM indicate that through leaching process the surface of leach residues differs much from that before leaching.