| Fankou lead-zinc mine is located in the48km northeast of Shaoguan city, Guangdong Province, China. It is an important lead-zinc metal production bases in China and is known for the unique geological phenomenon that the proven bonanza of more than8million tons of lead and zinc metals is in occurrence within the narrow lkm2ranges. The ores belong to the native high-sulfur lead-zinc sulphide ore, and it is also abundant in silver, mercury, cadmium, gallium, germanium and other rare metals with high comprehensive recovery values. We chose the lead-zinc ores as the object of study, and investigated the floatation properties of different kinds of sulfide mineral under the condition of different inhibitors, pulp pH value, pulp potential and collectors. Based on existed experiments, we performed the investigation of new technology and new reagent system with a series of actual ores. The investigation has made good beneficiation indicators and provided bases for next-step design and transformation of factory.The floatation behavior of galena, sphalerite and pyrite pure ores in the Fankou lead-zinc ores was investigated. The research results indicated that:under the condition of the combined collectors of butyl xanthate and diethyl dithiocarbamate, very good floatation property of the sulfide mineral can be obtained. Using lime as adjustment reagent of the pulp potential, the pulp potential of175mV with the pH value of12.5is the best potential for the separation between lead-zinc and lead-sulfur. By contrasting the effect of three kinds of inhibitors, that is sodium thioglycollate, dimethyl dithiocarbamate sodium and sodium humate on the floatation behavior, the result showed that separation between lead-zinc and lead-sulfur can also be achieved by the proper amount dosage of inhibitors. And the capacity test for these three types of inhibitors indicated that the inhibiting effect of sodium humate on pyrite is the strongest, while dimethyl dithiocarbamate sodium the weakest.By using infrared spectrum test and detection technology of total carbon absorption volume, we investigated the functioning mechanism of sodium thioglycollate on the surface of pyrite. The research indicated that-SH in the sodium thioglycollate has the property of mineral affinity and can be strongly absorbed on the surface of pyrite. And-COOH is in directional arrangement towards outside. The detection of the total carbon absorption volume indicated that, regardless of high-alkali of low-alkali conditions, the total adsorption values of sodium thioglycollate is much greater than the theoretical values of pyrite absorbing the single molecular layer to saturation.Considering the feature of fine grained disseminated characteristics of the lead-zinc deposit in Fankou, we applied the priority floatation technology based on the summarization of existed advanced results and useful experience. Then we creatively introduced super-fined mixing mill processing to handle with the lead middlings and promoted the dissociation between fine-grained disseminated galena and other mineral to improve the total dissociation degree. This can strengthen the recycle of fine grained galena. Meanwhile, sodium thioglycollate was used in replace of the lead concentrate inhibitor lime. The floatation of lead was performed under the condition of the reduction of total dosage of lime. Ammonium dibutyl dithiophosphate was used as the sole foaming agent in the full circuit test which can effectively reduce the CODcr value of the total tailings water. The new technology achieved good beneficiation indicators by ore dressing test and scene validation test. The result showed that without adding slurry, indicators of the complete closed-circuit test are as follows:lead concentrate with60.17%of lead and the recovery rate of lead is86.67%, zinc concentrate with55.41%of zinc, and the recovery rate of zinc is94.43%. By adding slurry to simulate the scene production, indicators of the complete closed-circuit test are as follows:lead concentrate with58.13%of lead and the recovery rate of lead is83.47%, zinc concentrate with54.24%of zinc and the recovery rate of zinc is94.13%. |
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