Yellow iron alum basic principles of low-pollution law is before "Shen alum", the first by a low temperature pre-adjustment in the composition of the solution and, in the process of Shen alum can not add a neutralizing agent satisfaction in addition to iron. The main flow can be represented by the next two figures. The left figure shows the low pre-neutralization process. The pre-neutralization can be either calcine or a dense underflow after neutral leaching. If the iron containing pots in the hot leachate is higher, the return of the dense supernatant may be beneficial after precipitation of the crucible; the right side of the figure below shows the procedure for using a neutral leachate as a diluent.
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Because the jarosite process jarosite pollution generated containing only a small amount of value metals. Reduce the loss of valuable metals such as lead , zinc , silver , gold, tin , and copper . Table 1 below shows the comparison of metal recovery rates between the low-contamination yellow iron crucible method and the conventional iron crucible method; Table 2 below shows the composition of the two precipitation method iron crucibles. These data show the superiority of the new method. The method is a method for treating zinc slag developed by Australia Electric Zinc Co., Ltd., which is the world's second largest zinc smelting plant with an annual output of 200 kt zinc, and was tested in an intermediate plant with a daily output of 500 tons of zinc. The production process is shown in the figure below. The Australian Electric Zinc Company has decided to introduce a low-pollution yellow iron sputum method in the transformation of the production plant.
Table 1 Different iron bismuth metal recovery rate | ||
element | Metal recovery rate /% | |
Conventional yellow iron shovel method | Low pollution yellow iron sputum method | |
Zn | 94~97 | 98～99 |
Cd | 94~97 | 98～99 |
Pb | ~75 | >95 |
Ag | ~75 | >95 |
Au | ~75 | >95 |
Cu | ~90 | >95 |
Table 2 Composition of different iron slag | ||
element | Conventional yellow iron shovel method | Low pollution yellow iron sputum method |
Fe | 25% to 30% | 32.40% |
Zn | 2 to 6 | 0.25 |
Cd | 0.05~0.2 | 0.001 |
Pb | 0.2 to 2.0 | 0.05 |
Ag | 10~15g/t | 4g/t |
Au | 0.6g/t | <0.1g/t |
Co | 0.01% | 0.00% |
Cu | 0.1 to 0.3 | 0.016 |
China's Changsha Institute of Mining and Metallurgy Ma Rongjun was equal to the research on the low-pollution jarosite method in the 1980s, and also got good results. China's Chifeng Smelter has adopted the low-pollution jarosite method for industrial production and achieved good economic and social benefits.
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