Preparation of high purity cerous carbonate with high total amount of rare earth
A technology of cerium carbonate and high rare earth, applied in rare earth metal compounds, chemical instruments and methods, inorganic chemistry, etc., can solve problems such as low production efficiency, increased energy consumption, and impact on the application of deep-processed products, and achieve easy industrial production and stable quality Effect
Inactive Publication Date: 2009-07-15
BAOTOU JINMENG RARE EARTH
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Problems solved by technology
The disadvantage of this method is: because cerium carbonate is easily dehydrated and oxidized to CeO 2 , so the temperature control requirements are extremely strict, and due to the unevenness of static drying, it must be turned frequently, resulting in low production efficiency and increased energy consumption
The total amount of rare earth in this method can reach more than 70%, but due to the high temperature precipitation in the hydrochloric acid medium, the CL in cerium carbonate - Content greater than 0.1%, Fe 2 o 3 , CaO, SiO 2 is also high, which affects its application in deep-processed products
Method used
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Embodiment 1
[0010] Embodiment 1: 1000L concentration 189g / L cerium chloride feed liquid is squeezed into 20m 3 Add 3000L of pure water to the FRP reaction tank, heat it to 55°C with steam under stirring, slowly add 1780L of ammonium bicarbonate solution with a concentration of 160g / L and a temperature of 60°C, keep it warm for 3 hours, drain the supernatant, Liquid ratio = 1:15 Wash twice with water at 60°C. Centrifuge to dry to TREO>30wt%. Move the dried cerium carbonate to 10m 3 Add 6000L of pure water to the FRP reaction tank, heat to 97°C with steam under stirring, keep the temperature constant for 3 hours, wash with water twice, and spin dry.
Embodiment 2
[0011] Embodiment 2: with embodiment 1, but add pure water 5000L.
[0012] Its quality indicators are shown in Table 1
[0013] Table 1
[0014]
[0015] According to the embodiment, the process method can fully meet the requirements of high-purity and high-rare-earth total cerium carbonate quality index. Note: TREO: Total rere earth oxide (total amount of rare earth).
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The invention relates to a method for preparing cerous carbonate with high purity and high total content of rare earth. The invention is characterized in that the cerous carbonate with high quality is prepared with the first method of adding 40-80g / L cerium chloride liquid to 80-160g / L ammonium hydrogen carbonate or sodium carbonate solution to subside cerous carbonate and the method of mixing the cerous carbonate according to the ratio of solid to liquid in weight being 1:2 to 1:3, increasing the temperature to be higher than 97 DEG C to be kept for 2-3.5 hours, washing at least for one time according to the ratio of solid to liquid in weight being 1:5 to 1:10 and centrifugally spin-drying the mixture, wherein the addition amount of the ammonium hydrogen carbonate or sodium carbonate is 1.5 to 1.8 times that of the rare earth oxide, and the at least one-time washing is conducted according to the ratio of solid to liquid in weight being 1:5 to 15; secondly, . The invention has the advantages that the cerous carbonate with high purity and high total content of rare earth prepared by the technique method has stable quality and is easy to implement industrial production.
Description
Technical field: [0001] The invention relates to a method for preparing high-purity cerium carbonate with high total rare earth content, in particular to a method for preparing high-grade cerium carbonate with a purity greater than 99.95% and a total rare earth content greater than 70%. Background technique: [0002] Cerium is an element in the rare earth element series, and its content in bastnaesite accounts for 50%. Baotou Baiyun Ebo rare earth mine accounts for 70% of the world's reserves and is a typical bastnaesite. my country produces 30,000 tons of cerium per year (calculated as a single rare earth oxide), and its single oxide, carbonate, nitrate, chloride, sulfate and derivatives of cerium are the most important products in the rare earth industry. [0003] Cerium has a wide range of uses. Since the 1990s, it has been widely used in glass clarifiers, decolorizers, oxidants, automobile exhaust catalysts, phosphors, ceramic emulsifiers, colorants, UV protective agent...
Claims
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Inventor 王志强宋卿张存瑞张补河柳勇孙喜平
Owner BAOTOU JINMENG RARE EARTH