| The Al-Zn-Fe-Si residue is one of produce in the process of hot dip Zn-Al alloy coating, it mianly composed of aluminium, zinc, iron and silicon. A certain amount of this residue is detrimental to the process of hot dip Zn-Al alloy coating. In the actual manutacturing operations they must go fishing this residue at regular interval. Aluminium and zinc contents of Al-Zn-Fe-Si residue are much, usually contain moer than 50% of aluminium,20～30% of zinc, the others component is iron and silicon. Large amount of this residue will increase the aluminium and zinc comsumption, resulting in increase of cost. There isn't a process of efficient recycling aluminium and zinc from this residue at persent. The resource of aluminium and zinc are gradually deficient, study on a process of efficient recycling aluminium and zinc from this residue is already very urgent.In this paper, the process of recycling aluminum and zinc from Al-Zn-Fe-Si residue has been studied which based on the nature of aluminum and zinc, the resource of aluminum and zinc, the previous and current process of produce aluminum and zinc, the process of recycling aluminium and zinc and the process of hot dip Zn-Al alloy coating. It was demonstrated in theory, studie on effects of the factots on the experimental than summarize the rules by experiments. In order to provide the basic data of amplified experiments.There are two steps in the process of recycling aluminum and zinc from Al-Zn-Fe-Si residue. The first step, separation aluminum from the Al-Zn-Fe-Si residue which aluminum content is 51.68%, zinc content is 20.59%, iron content is 19.12%, silicon content is 3.47% by leaching in the zinc, obtained Zn-Al alloy which aluminum content is 1～20% and slag which zinc content is 80～90%. The second step, separation zinc and aluminum from Zn-Al alloy and zinc from slag by vacuum distillation. Vacuum distillation of Zn-Al alloy got the zinc which purity is more than 99% and aluminum which purity is more than 98%. Also vacuum distillation of slag got the zinc which purity is more than 99% and residue which zinc content is lower than 0.39%.The result of experiments showed leaching rate of aluminum increased with increasing leaching temperature, increasing ingot temperature and increasing material ratio. The optimum parameters are as follow:leaching time 25 min, times of feeding Al-Zn-Fe-Si residue 2, size of Al-Zn-Fe-Si residue 10-3 mesh, stirring speed 260 r/min. The leaching rate of aluminum increased in operation of remelting slag, but the amplitude was small, and it is an alternative operation. It can increased the leaching rate of aluminum in operation of leached Al-Zn-Fe-Si residue for two or many times, obtained Zn-Al alloy which aluminum content was high, iron and silicon content was low, obtained slag which zinc content was high. The leaching rate of aluminum was 68.25% under condition of material ratio was 8, and the leaching rate of aluminum was 78.80% under condition of material ratio was 16. Result of vacuum distillation showed, Vacuum distillation of slag under the distillation temperature was 800～1000℃, distillation time was 30min, vacuum degrees was 5～15Pa, we have got zinc which purity was 99%, the volatilization rate of zinc was higher than 99%, zinc content was 0.39% in the residue. Vacuum distillation of Zn-Al alloy, zinc content was 8.3% as raw material under the distillation temperature was 600～900℃, distillation time was 10～70min, vacuum degrees was 5～15Pa, we have got zinc which purity was higher than 99%, volatilization rate of zinc was 99.99%. And aluminum which purity was higher than 98%, zinc content was 0.0066%, iron content was 0.042%, silicon content can be less than 1%. |
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