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 Posted: Fri 10:03, 24 Dec 2010 Post subject: ugg milano Preparation of oxalic acid complex fine |
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Preparation of oxalic acid complex fine powder of barium titanate
2BaTiO (04) 2.4 H20 BaTio3 powder prepared by the thermal decomposition process of Tab. 2ProcessofIhermaldram ~ smmofRaTiO {o4) 2.4 H20Imolllal'K ~ powder Table 2 shows that the decomposition rate of 15.56% for a 48. o9% between. In order to determine the appropriate calcination temperature and calcination time, the precursor obtained by experiments carried out thermal analysis results are as follows in Table 3. Table 3 TGA results precursor T. 3Resulls when mennogra, z ~ a4c Ⅲ call y the ofthel: ~ ecursor can be seen, when the 6 ∞ 1h when the calcination rate was 42.18% weight loss, when the calcination temperature of 700 or more, can be decomposed in a short period of time nearly complete. To further examine the temperature on the particle size and distribution, of the calcining temperature on particle size and distribution of products. The precursors were calcined at temperatures 800,850,900,1000 1.5h, the average size and size distribution of income, such as shown in Table 4 and Figure 2. Around 2 calcination temperature on the particle size distribution of ng. 2Effect friends when ~ aldzmflontE ∞ pI 4 Cape onparticleslzedistrlmllon decline of calcining temperature on particle size Tab. 4Effeasmleltmatqtntm ~ ramrm ∞ l ~ l \Superfine Powder. 81 is more easily dissolved in hydrochloric acid, which has already happened that burning or sintering. In order to obtain the product of smaller size,[link widoczny dla zalogowanych], the temperature is 800 ℃ better. Particle size distribution was narrow at this time. 2.3 BaTio3 stirring intensity on the particle size and distribution of small scale when the technology roadmap and process parameters determined,[link widoczny dla zalogowanych], in large-scale production equipment. A variety of macro-transport phenomena. If momentum. Heat and mass transfer, can be mass-produced product performance can deviate from the small scale of the situation. Further investigated this mixing of material grain size and distribution of products,[link widoczny dla zalogowanych], the results shown in Figure 3. Thus, the full mix of materials is conducive to a narrow size distribution obtained products. This is mainly because of the high intensity of mixing is conducive to homogeneous nucleation and growth. And the reaction shear force in the logistics field make some aggregates dispersed into smaller particles. (Ⅱ) by a groan day nfifing. D ∞ = 0.72m; (b) Xiu mixingD ∞ = 1.13/an Figure 3 Ba'riq stirring intensity on the particle size and distribution of FIg. 3Effectofreactantm Ⅺ female mtheparadesizeandd ~ nlmliuanaa103p03 Conclusion (1) oxalate precipitation in the traditional method based on the proposed complex oxalate precipitation, the products can better control the Ba / Ti ratio, the system of high purity, particle size and better distribution of ultrafine powder. This simple process operation, process stability,[link widoczny dla zalogowanych], easy amplification, large-scale production with large applications. (2) titanyl oxalate complex formation should be controlled at pH = 2.5-3, the calcination temperature of precursor, and the reaction mixture to the final product material particle size and distribution have a greater impact. In the reactants Ba / Ti ratio of 1-1.01. Calcination temperature of 800 ℃. Time is 1h, the conditions of mixing the reactants, using the proposed new process quality can be better prepared the BaTio3 powder. References: [1] KF Lo. E-Preparation of barium titanate ceramic powders [J]. Materials Review. 1993. (5). 51-53. [2] Si-Qiang Hu. Li Shaohua. Water into the hot stage technology research and application [J]. Chemical Metallurgy. 1994.15 (4). 309-315. [3] Johnwang. Ultret5 ~ bariumfitanatepo pool 8via mouth. Bleed at the nose quiet olIp10c coffee m [J]. JAmCerams0. . 1999.82 (4): 873 A Zhao 1 [4] Zhu Qian. New Method for Preparation of barium coating of [J]. Salt industry. 2OOO, 3 (2) :8-10. [5] Lianzhou Wang. Fan Fukang. pH, chemical coprecipitation powder properties of crucian carp q [J]. Ceramic Society,[link widoczny dla zalogowanych], 1999. (1) :3-8. (Edit Huang Xiaochuan
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