Determination of titanium dioxide in titanium pigment by ammonium ferric sulfate titrimetry with alkali fusion
YANG Mingming1, HE Zhengzhen2
1. The 601th Geological Party,Sichuan Bureau of Metallurgical Geological Exploration,Panzhihua 617061, China; 2. Panxi Pollution-free Agricultural Monitoring Center,Panzhihua 617061, China
Abstract：The content of titanium dioxide determines the quality grade of titanium pigment products, so the accurate determination of titanium dioxide content in titanium pigment is of great significance. The samples were melted by sodium peroxide at high temperature. Then it was leached by hot water followed by dissolution with mixed acid composed of hydrochloric acid and sulfuric acid. The quadrivalent titanium in solution was reduced to trivalent with aluminum foil. Under the protection of saturated sodium bicarbonate solution, the content of titanium dioxide in titanium pigment was determined by ammonium ferric sulfate titrimetry with smmonium thiocyanate as indicator. The effects of sample decomposition method, the dosage of sodium peroxide, and the dosage of mixed acid composed of sulfuric acid and hydrochloric acid on the determination results were studied. The results showed that the sample could be fully dissolved under the following conditions: 0.200 0 g of sample was transferred in a 30 mL corundum crucible containing 2.000 g of sodium peroxide; the sample was covered with 1.000 g of sodium peroxide; the mixture was melted in muffle furnace at 500 ℃ for 5 min; when the solid sodium peroxide was melted, the temperature was increased to 650 ℃ for further melting for 10 min; 30 mL of hot water was added for leaching; finally, 30 mL of mixed acid composed of hydrochloric acid and sulfuric acid was added slowly to dissolve the melt. The certified reference material and actual sample of titanium pigment were determined according to the experimental method. The relative error of the determination results for the certified reference material was less than the allowable limits of relative errors stipulated in The specification of testing quality management for geological laboratories. The relative standard deviation (RSD, n=6) of determination results of actual sample was less than 0.2%.
杨明明, 何争珍. 碱熔-硫酸铁铵滴定法测定钛白粉中二氧化钛[J]. 冶金分析, 2022, 42(6): 76-79.
YANG Mingming, HE Zhengzhen. Determination of titanium dioxide in titanium pigment by ammonium ferric sulfate titrimetry with alkali fusion. , 2022, 42(6): 76-79.
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