Preparation method of high-purity cerium oxide for compact fluorescent lamps
A cerium oxide, high-purity technology, applied in chemical instruments and methods, rare earth metal oxides/hydroxides, inorganic chemistry, etc., can solve the problems of high cost and inability to have purity, and achieve advanced technology and high environmental protection , Adaptable effect
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[0017] As described in the background art, the existing preparation methods cannot combine the advantages of high purity and low cost. In order to solve the above technical problems, the application provides a method for preparing high-purity cerium oxide for compact fluorescent lamps, the content of cerium oxide in high-purity cerium oxide is ≥99.99wt%, and the samples to be treated include cerium oxide and terbium oxide, The above preparation method includes: treating the sample to be treated with sulfuric acid to dissolve cerium oxide and terbium oxide to obtain a primary treatment liquid and a first solid residue; subjecting the primary treatment liquid to a precipitation reaction to obtain a rare earth precipitate containing cerium hydroxide The rare earth precipitate is neutralized with hydrochloric acid to obtain a secondary treatment solution containing rare earth chloride; the first organic extractant is used to carry out the first extraction treatment on the second tr...
Embodiment 1
[0036] use as figure 1 The shown process flow prepares high-purity cerium oxide, and the specific operation process is as follows:
[0037] The sample to be treated includes 55% cerium oxide and 35% terbium oxide and impurities.
[0038] The above-mentioned sample to be treated was dissolved with 6 mol / L sulfuric acid to obtain a primary treatment solution, wherein the ratio of the total amount of cerium oxide and terbium oxide to the molar number of sulfuric acid was 1:1.5.
[0039] Using 9 mol / L sodium hydroxide solution to convert the cerium element in the primary treatment solution into cerium hydroxide precipitate to obtain a rare earth precipitate containing cerium hydroxide. The molar ratio of rare earth oxide to sodium hydroxide is 1:1.6. After the reaction is complete, take the supernatant and test it with oxalic acid solution. If there is no precipitation, it indicates that the rare earth elements have completely precipitated.
[0040] 6 mol / L hydrochloric acid wa...
Embodiment 2
[0045] The difference from Example 1 is that the first organic extractant is a mixture of di(2-ethyl-hexyl) phosphate (P204) and kerosene at a weight ratio of 1:1.
[0046] The purity of the prepared cerium oxide product is 99.995wt%, and the yield is 91.7wt%.
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