Study On The New Cleaning Production Techniques Of 3YL For Substitution Of Cyanide Leaching Of Gold

Mineral resources are mankind's survival valuable asset, whose status is noticeable in the national economy. Mineral resources account for about 70% of the natural resources needed by human. However, since lack of sufficient awareness about the non-renewable ,the limit and the unsatisfied supply of the mine resources, many serious phenomenon occurred in our country, such as a weak awareness of environmental resources, backward thinking of comprehensive utilization, abandoning the poor and mining the rich even disordered mining to pursuit the short-term economic benefits. Not comprehensive utilization of mineral resources resulted in the low utilization and recovery rate. The unreasonable mining is not only a waste of resources, but also leads to the destruction of the ecological environment. Such exploitation mode at the expense of the environment will fundamentally shake mining industry in sustainable development. Only comprehensive utilization can achieve fully utilization and effective protection mineral resources, and also be benefit for the protection of the environment and maintaining ecological balance. Through comprehensively recycle resources, economic benefits of the mineral resources can be increased and significant economic value would be generated. That was inexhaustible power of the enterprise to comprehensively develop and utilize sources.So it is significant to strengthen the integrated resource recovery and utilization of mineral to improve the cost-effectiveness and to reduce environmental pollution. And the rate of the mineral resources utilization is closely related to mining, selecting and smelting technology. The backward process technology is an important reason that restricted to the comprehensive utilization of resources. For example, because of the behindhand mining technology, testing techniques and tools and metallurgy unscientific process, many components associated symbiotic was abandoned. Therefore the introduction of foreign advanced technology and transformation through application, or through independent development of new technologies, new processes and equipment and so on are to enhance the comprehensive mineral resources utilization with taking full account of the possible impact and the damage to the environmental and reducing the surrounding environment pollution and human health damage.In this paper the selected refractory concentrated gold ore is in terms of its own characteristics. Because of the ore material existence, such as carbonaceous and sulfide matter, the gold in ore can not be extracted by conventional leaching extraction method, that is to say refractory gold. The refractory nature and smelting technology reinforce each other and appropriate technology can make it become easier.As to the researches at home and abroad, through a series of experiments, the subject mainly aimed at the refractory concentrated gold and investigated the pretreatment methods and technological conditions; pretreatment of gas absorption wastewater treatment; gold concentrate leaching methods after pretreatment and technological conditions (-3YL leaching conditions); grouping separation condition of many kinds of metals (gold, silver, lead, copper, zinc, iron), heavy metal recovery methods and conditions; The purification method and the process conditions of gold and silver.3YL is non-cyanide leaching agent of the subject and has applied for patent. This leaching of gold and can replace the cyanide leaching method that caused heavily pollution. When we use 3YL leaching gold, we mainly study on the effect of the principal amount of 3YL, chloride concentration, solid-liquid ratio, the temperature baptism, baptism time and acidity of the processing conditions on the leaching rate of gold and silver. The determined parameters of the above conditions are as follows : the amount of 3YL 15kg/t, chloride concentration of 5% ,the ratio of solid and liquid 1:4, room temperature, the baptism time of 8h and pH of 2. 5~3. 0. Experimental results showed that under the above conditions the gold leaching had a good efficiency, and the leaching rate was above 95%, 20~30% higher than that of the traditional cyanide leaching gold leaching. Moreover silver and lead can be leached at the same time, leaching rate of silver can reach more than 90%, 50~60% higher than that of the traditional method of silver leaching; Lead leaching rate can reach 95%. It can be seen that this method of leaching gold will greatly increase the rate of leaching of gold and silver and bring a certain economic benefits. Moreover, the whole leaching process will not produce pollution and have some environmental benefits.In the DL-sulfur chloride oxidation pretreatment process, the effect of chloride concentration, pretreatment temperature and Pretreatment time on the desulphuri- zation carbon removal efficacies was mainly considered. The experiments showed that when pretreatment conditions were the chloride concentration of 8%, temperature of 580°C, time of 2. 5h, the efficiency of desulphurization and decarburization was preferably with carbon removal more than 90% and sulfur removal rate above 95%. The gold ore treated under the conditions was in the same with the follow-up 3YL leaching gold, and the silver leaching rate can be enhanced.wastewater of absorption pretreatment gas was strongly acidic, containing a large number of SO42-and Cl-. Based on the actual situation that mines could provide massive natural calcium carbonate ores and about 50°C waste heat was available in the ore roasting process, Joint process technology was advanced that was combined by the massive use of natural calcium carbonate water sample pretreatment and crystallization membrane distillation technology for the deep handle with pretreatment wastewater. In wastewater pretreatment process, the main consideration factor was the effect of the natural size of the calcium carbonate on SO42-removal rate. So it was determined that the particle size of CaCO3 was 5mm and the produced CaSO4 was used as raw materials to produce cement. Next Fe2+ in the wastewater was treated through aeration for 10 minutes, to prevent pollution on the membrane. When the crystallization membrane distillation processed the pretreatment wastewater, the effect factors of the feed temperature, velocity and the pH value on the flux was mainly studied on. The experimental results showed that in these experimental conditions( feed heating temperature of 50℃, Velocity 18. 5 ml/min, pH= 7) right after water sample pretreatment, continuous membrane distillation operation was made for 18h , CaCl2 crystallization can be seen in the concentration solution with a good crystallization efficiency. This shows that the wastewater treatment methods not only fully use of the existing mine resources, but also protect the environment and achieve the comprehensive utilization of mineral and water reuse.When preconditioning, metals based with gold and silver in the ore- iron, copper, zinc (Cu) transformed into their chlorides or oxides. In the process of washing, since water lotion acidic, copper elements can enter the water eluent, the gentle metal can be separated with the simple. Experimental results showed that with the water conditions as the ratio of 1:6, stirring for 2. 0 hours, the acidity of pH=3. 0 room temperature, Cu, Zn leaching rate was more than 94%. So under these conditions Cu, Zn has entered water lotion basically.Fe was separated with P507 extraction method, then Cu, Zn were separated and enriched with C401 resin adsorption method respectively, and at last the corresponding finished product was obtained, enhancing the smelting cost-effective. In addition, from an environmental point of view, iron, copper and zinc were recovered and also the emissions of heavy metals had a corresponding reduction, so the pollution of the environment was enlightened.Leaching of gold and silver was again though C410 resin concentration, sulfur urine elution, alkaline mud sediments, and sulfuric acid purification. Then nitrate dissolved silver, aqua regia dissolved gold and at last gold and silver products can be obtained. The technology in the subject was composed by the below four modules: pretreatment, 3YL leaching, separation and enrichment of gold, silver by chelating resin and polymetallic integrated recovery process. The innovations of overall process were achieved. It was friendly to the environment and achieved cleaner production and more comprehensive recycling metal comparing with the traditional gold smelting process.