| Συγγραφείς: |
鲁兴武1,2,3, 闵小波1,4, 殷勤生5, 牛振华2,3, 祁万虎2,3, 张恩玉2,3, 程亮2,3, 李俞良2,3 |
| Abstract (English): |
This paper adopts the collaborative treatment of fayalite slag and copper tailings slag by side blown smelting and volatilization methods. By adjusting factors such as temperature, slag type, additives, etc., the metals are fully volatilized, effectively recovering trace metals while achieving harmless disposal of fayalite slag, providing technical support for the resource recovery and harmless treatment of fayalite slag. Two steps are conducted in the experiments to better simulate the industrial process of side blown smelting-volatilization. In the first step, fayalite slag, copper tailings slag, flux calcium oxide (CaO), and reducing agent coal powder(approximately 52% carbon content) are granulated using a laboratory disc, with a controlled particle size of 02 mm, and then dried at 80 °C in a hot air drying oven for 24 hours. 100 g of the sample is taken and placed in a clay crucible, and a certain concentration of oxygen is passed in a high-temperature dustcollecting electric furnace for volatilization experiment. After the reaction is complete, the furnace is cooled, and the smelting slag is obtained. A suitable amount of smelting slag is taken to calculate the dosage of chloride additives (calcium chloride (CaCl2 • 2H2O), sodium chloride (NaCl), zinc chloride (ZnCl2), or iron chloride (FeCl3 • 6H2O)), reducing agent coal powder(approximately 52% carbon content), etc. by mixing adequately with the smelting slag(total sample weight of 50 g), and then a volatilization experiment is conducted in the high-temperature dust-collecting electric furnace. After the reaction is complete, the furnace is cooled, and the volatilized slag is obtained. This study significantly increases the volatilization rate of metals such as Pb, Zn, Au, Ag by co-disposing copper tailings slag with fayalite slag, adjusting the slag type, and adding chloride additives, while briefly describing the volatilization mechanism. This method not only achieves effective volatilization and recovery of the above-mentioned metals, enriching them in the smoke, but also does not produce secondary pollutants, providing technical support for reducing industrial application costs. The study shows that the formation of Cl2 by chloride agents combines with low-melting metal chlorides formed by metal elements, accelerating the volatilization process and significantly enhancing the volatilization efficiency. Under the conditions of controlling the smelting temperature at 1 200 °C, volatilization temperature at 1 250 °C, zn (CaO/SiO2) =1, w (FeO/SiO2)=1.4, and chloride agent addition of 3%, the volatilization rates of Pb, Zn, Au, Ag reached 99.6%,98.6%,59.8%, and 92.7% respectively. [ABSTRACT FROM AUTHOR] |
| Abstract (Chinese): |
通过将铜选尾渣与铁矾渣协同处置, 调控渣型, 并添加氯化物添加剂, 显著提髙了 Pb、Zii、Au、Ag等金属的挥发率, 同时简述 了挥发机理。这一方法不仅实现了上述金属的有效挥发回收并富集至烟尘中, 且未产生二次污染物, 为降低工业应用成本提供了技术 支持。结果表明, 氯化剂反应生成的C1, 与金属元素结合形成的低熔点金属氯化物能够加速挥发过程, 显著提升了挥发效率。在控制 熔炼温度为1 200 °C、烟化温度为1 250 °C, m(CaO/SiO2)=l、7«(FeO/SiO2)=1.4,以及氯化剂加人量为3%的条件下, Pb、Zn、Au、Ag 的挥发率分别达到了 99.6%、98.6%、59.8%和92.7%。. [ABSTRACT FROM AUTHOR] |