Abstract：Nickel pig iron is an important raw material for stainless steel smelting.The accurate and rapid detection of nickel content in nickel pig iron is very important for the quality and cost control of stainless-steel melting. During the determination of nickel in nickel pig iron by dimethylglyoxime gravimetric method, a large amount of acid is required to dissolve the sample. Sometimes the insoluble residue should be treated by fusion with complicated procedures. The nickel pig iron sample was decomposed by microwave digestion. Nickel was effectively separated with cobalt and copper by dimethylglyoxime precipitation separation. Then the content of nickel was determined by EDTA back titration. Consequently, a method for the determination of nickel in nickel pig iron was finally established. Five certified reference materials of nickel-containing pig iron were used for verification.The relative standard deviations (RSD, n=7) of the measurement results were between 0.14% and 0.33% when the mass fraction of nickel was 5%-20%. The significance test was carried out by the t test. The results showed that there was no significant difference between the standard and measured values. Same nickel pig iron sample was determined according to the experimental method and national standard method GB/T 31924-2015 Nickel pig iron-Determination of nickel content-dimethylglyoxime gravimetric method, respectively. The results indicated that there was no significant difference between two methods.
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