Abstract
In this work, the local equilibrium modeling method of a non-equilibrium multi-phase reaction system in the top-blowing melting process of electronic waste was studied. The automatic judgment mechanism of phase transformation and the improvement of the trace component solving algorithm were explored to build the mathematical model of the element migration and transformation. Secondly, to determine the distribution mechanism of various elements in top-blowing smelting of electronic waste, the thermodynamic digital simulation system was developed according to the software platform of metallurgical process calculation. On this basis, combined with the industrial production practice, the coupling simulation experiment was carried out to investigate the influence of oxygen:feed ratio, oxygen concentration, amount of additive iron powder and CaO:SiO2 ratio of the slag on the smelting process. In addition, the direct yields of metals in the slag were Cu 90.69 wt%, Au 98.57 wt%, Ag 94.84 wt%, and Pd 97.87 wt% under the optimum conditions. Finally, the simulated values were consistent with industrial data, which can provide theoretical guidance for the industrial production practice of the top-blowing smelting of electronic waste.
Highlights
The twenty-first century is an era of information and technology, which has greatly promoted the progress and development of society
The electronic waste is essentially a valuable urban mine which contains a large number of valuable metals, such as copper, lead, tin, nickel, antimony, gold, etc. [8,9]
Many scholars have developed new methods for efficient and environmentally friendly recycling of valuable metals from electronic waste, which can be differentiated into the mechanical process, hydrometallurgical process, biometallurgical process and pyrometallurgical process [10,11]
Summary
The twenty-first century is an era of information and technology, which has greatly promoted the progress and development of society. Many scholars believe that pyrometallurgical technology is still the most feasible method for the efficient treatment of electronic waste [16], which has the characteristics of a large processing capacity and strong adaptability to raw materials It is burned in the furnace or molten pool to remove refractory oxides such as plastics and glass fibers so that the impurity metal oxides form the slag phase and separate from the molten metal phase. The multi-factor coupling experiments were carried out, and the effects of oxygen:feed ratio, oxygen concentration, amount of additive iron powder and CaO:SiO2 ratio of the slag on the distribution behavior of elements in the topblowing smelting process were investigated It can provide great theoretical and practical significance for promoting the transformation and upgrading of industrial technology for green and efficient recycling of electronic waste. The amount of organic matter in the copper-clad laminate was approximately 23.9 wt%
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