減少鎘被烟尘浸出渣带走的損失从鎘生产过程中金屬的分配平衡看來,鎘的最大损失在于烟尘浸出过程中被浸出渣带走,因此降低鎘被浸出渣帶走的損失是提高鎘金屬实收率的最大潛力。以往由于烟尘含鎘量少(一般在2%以下),每吨鎘所使用的鋅烟尘量龐大,生成的浸出渣很多,浸出渣含鎘也比現在高,是造成过去鎘实收率低的主要原因。兩年來鎘損失于烟尘浸出渣的情况如表1所示: 从表可知,要減少鎘被烟尘浸出渣帶走的损失有兩个方面:一方面是減少渣量;一方面是降低渣含鎘。我們將第二次处理后的渣漿,再处理一次也就是烟尘进行三次浸出处理。經过三次浸出处理以后,不仅是浸出渣的量減少了,也使浸出渣含鎘量降低,这 Reduce the loss of cadmium by soot leaching residue From the balance of the distribution of metals in the production process of cadmium, the biggest loss of cadmium is that the leaching residue is taken away during the soot leaching process, so reducing the loss of cadmium leaching residue is to increase cadmium Metal real yield the maximum potential. In the past due to the small amount of cadmium dust (usually less than 2%), per ton of cadmium used by the large amount of zinc dust, leaching residue generated a lot of leaching residue containing cadmium is higher than it is now, resulting in the past low yield of cadmium main reason. Cadmium loss in two years from the dust leaching residue as shown in Table 1: From the table shows, to reduce the loss of cadmium by dust leaching residue has two aspects: on the one hand to reduce the amount of slag; on the one hand is to reduce the slag containing cadmium . We will be the second treatment of the slurry, and then treated once, that is, the dust leaching three times. After three leaching treatments, not only is the amount of leached residue reduced but also the cadmium content of the leached residue is reduced, which