Experimental Study Of Wastewater Reduction Technology In The Copper Sulfate Production

Metal salts production easy to cause environmental pollution of heavy metal wastewater emissions, such as copper sulfate production process, extraction process output a large number of wastewater which containing high salt and nickel, using extraction enrichment technology, low concentration metal containing solution than the direct recycling of the high concentration of nickel sulfate solution, reduce emissions of the waste water, and combining with PFS- NaOH method and treatment of high salt waste water, improve the heavy metals utilization rate, Is one of the important mehord in hydrometallurgy of cleaner production.Combined with copper sulfate product extraction process in the existing production process on properties of P204 extraction agent and related physical and chemical parameters to check and study, the main different metal extraction with P204 extraction agent for the principle of a different order, made a preliminary technical route, about 6 g/L for enrichment of P204 organic nickel solution needed to extract series of theoretical calculation, determine the nickel enrichment of soap method theory of the recovery of low concentration nickel solution series, and put forward to function at the beginning of the period of transformation of extraction equipment; Of PFS—NaOH to verify the theoretical basis of the wastewater treatment methods, to optimize the extraction process of output wastewater discharging standard.Simulation of gansu jinchuan copper sulfate production process, respectively for the nickel soap extraction enrichment and nickel copper bench shaker small test, verify the solutions of nickel 6 g/L after 3 grade nickel enrichment of soap to 40 g/L capacity, copper and nickel soap extraction 60 g/L ratio of 10:1, copper nickel material liquid ability; To test in the laboratory of PFS—NaOH wastewater treatment process, optimization of the proposed method is verified the feasibility of the wastewater containing nickel indicators.In industrial practice, P204 extraction tank of the copper sulfate production workshop function series, according to the technological requirements of the new changes on the part of the pipeline. Feeding debugging for actual production operation parameters and technology conditions: V soap after organic: V nickel sulfate solution: V material liquid: V acid wash nickel: V reverse extraction acid = 4:0. 8:1:0. 2:0. 6, a balance of extraction period of Ph is2.5,balance nickel soap section PH is 4.0.under the condition of nickel can be about 6 g/L solution concentration to more than 40 g/L, extraction residue containing nickel reduced to less than 0.03 g/L. Reduce waste water, emissions of 70 m3, reduce wastewater emissions for the whole year 23100 m3; Replacing the lime milk in the method of PFS—NaOH precipitation for high salt industrial wastewater containing nickel processing practice, good docking with the improved extraction process, after processing wastewater containing nickel can be below 0.5 mg/L.Through to the low nickel solution decreases of corresponding subsequent nickel saving solution processing operation cost is 323.9 yuan/m3, annual savings of 5.3293 million yuan. Realized on the basis of the original process reduce wastewater emissions 10%, heavy metal recycling cost savings; Bring obvious economic benefits for the enterprise, reduce the waste water and heavy metal pollution, reduce the environmental pressure, brought about significant environmental benefits and social benefits.