China Nonferrous Metallurgy

With the gradual decline of copper concentrate grade, impurity elements gradually increase, and the harmful element arsenic is difficult to remove and accumulates in the copper smelting system, which has a great impact on the quality of copper cathode. Combined with the actual production of copper top-blown melting, the distribution ratio of harmful arsenic elements in the dust is 55%~75%, that in the matte phase is 5%~15%, and that in the slag phase is 20%~35%. In this paper, the distribution and direction of arsenic in the copper top-blown melting process is theoretically analyzed, and the influence law of process parameters such as Fe/SiO₂ in slag, oxygen-rich concentration, matte grade, CaO content in slag on the distribution rate of arsenic in different products is investigated under laboratory conditions, and effective control measures for arsenic entering the slag phase are obtained. After optimizing the process parameters, the proportion of As in slag is 30%~40%, the proportion in dust is 50%~60% and the proportion in matte is 10%~20%, which solves the problem that a large amount of arsenic enters the sulfuric acid system to form arsenic slag during copper smelting and improves the adaptability of raw materials, thus controlling the content of arsenic in each product.