Abstract：The determination of sulfate content in copper concentrate can provide objective data basis for effectively distinguishing the impurity sulfate content grade in imported copper concentrate, and it is of great significance to combat adulteration of imported copper concentrate and promote the comprehensive utilization of resources. Copper concentrate is mainly composed of sulfide. It is difficult to separate sulfur in sulfate from in sulfur sulfide effectively by acid dissolution. The sample was leached with 50 mL of 50 g/L sodium hydroxide solution at 100 ℃ for 30 min under micro-boiling condition. The sulfur in sulfate was selectively transferred into the solution, which solved the separation problem of sulfur in sulfate and sulfur in sulfide in the sample. Then barium chloride was added to form barium sulfate precipitate. After standing at room temperature for 12-24 h, the sulfur content in sulfate solution (calculated as SO3) was determined by barium sulphate gravimetric method, which was the sulfate content in copper concentrate. Thus, the method of sodium hydroxide leaching and barium sulfate gravimetric method was established for determination of sulfate in copper concentrate. The contents of sulfate in two copper concentrate samples and three actual samples of copper concentrate mixed with natural minerals and copper smelting sludge were determined according to the experimental method. The relative standard deviations (RSDs, n=11) of the results were between 0.42% and 2.9%. The recoveries were between 95% and 104%. The results showed that the sulfate content in the natural mineral copper concentrate was very low, and the sulfate content in the doped copper concentrate sample was much higher than that in the natural mineral copper concentrate sample.
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