Preparation Of Hexahydrate Perchlorate Nickel And Process Design

The aim of this paper is to search for an economical and efficient method for synthesizing nickel perchlorate hexahydrate and to realize the industrialization process.In this paper,Ni-MH batteries were used to extract nickel sulfate from waste nickel-hydrogen batteries by crushing and separating,acid leaching,extraction and back-extraction,and the precipitated into nickel carbonate.The nickel carbonate was used as nickel source to realize the economical and efficient industrialized production of nickel perchlorate hexahydrate.First,scrap nickel-hydrogen batteries originated from the acid leaching are employed.For the waste battery anode material,mechanical separation of the anode hydrogen storage material is chosen,and then H2SO4 acid leaching is conducted.The experimental conditions are listed as follow:3mol/L H2SO4 solution,solid to liquid ratio of 1:5,Leaching time of 4h,leaching temperature of 95 ?.As a result,the precipitation rate of rare earth metals reaches 95%,while the leachng rates of Ni and Co are as high as 99.5%which can achieve the effect of preliminary separation.The optimum leaching conditions were as follows:3mol/L sulfuric acid solution,liquid to solid ratio of 7.5:1,leaching temperature of 95?,leaching time of 4h.Under these conditions,the separation of rare earth metals from other metals can be achieved initially.The leaching solution can adjust the pH value from 5mol/L NaOH solution,so that the rare earth metals in the leaching solution can be precipitated from the sulfuric acid leach solution in the form of sulfate.To realize the precipitation rate of 98%for rare earth metat,pH value should be controlled at 0.6-1.2.By two steps of leaching and pH adjustment,we can let more than 99%of rare earth metals in waste nickel-metal hydride batteries with be fully used in the form of rare earth metal sulfate precipitation,without the need for heating extraction and other steps.HBL110 is selectecd as extracting agent this framework and the extracting order of that is:Ni>Co>Zn.It is concluded that when the extracting agent concentration was 50%,the pH of the unloaded organic phase extracting agent was 3,and the pH of the extract solution was 2,ratio of organic to water was 7,and the extraction order was 5,we can make most of the nickel flow into the organic phase while other interferenced metal elements all remain in the raffinate.The optimum stripping conditions were room temperature,stripping time of 7 min,sulfuric acid concentration of 100g/L,ratio for organic phase to water phase of 5,where the stripping rate can reach 99.6%.The optimum cornditions for the synthesis of basic;nickel carbonate from nickel sulfate were summarized below:nickel sulfate solution of 0.5 mol/L,a reactor dropped into containixng saturated sodium carbonate(inverse addition),the pH value for the control endpoint of 8.5,the reaction temperature of 70 ?.After precipitation filtration,filtered with deionized water to remove the impurity ions,then dried,the basic nickel carbonate powder was thus prepared.Through the reaction of basic nickel carbonate with 30%perchloric acid,nickel perchlorate hexahydrate with high purity can be obtained.