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 Wysłany: Czw 18:21, 30 Gru 2010 Temat postu: air jordans Lime activity of alumina dissolution r |
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Lime activity on the dissolution rate of alumina
Out: With the dissolution time, dissolution of lime activity of the smaller ore. With increasing temperature, the dissolution of lime activity of the smaller ore. In the dissolution temperature of 25O ℃, for 30 minutes. 8% lime addition level. Nk is 196g / L, the high activity and low activity of lime dissolution rate difference of 36.36% lime; time to 60 minutes, the high lime and low lime dissolution rate is only a difference of 16.56%. When the temperature rose to 270 ℃, high active lime and low lime dissolution rate is only a difference of 30.4%. After adding different lime on the dissolution of red mud to lime x-ray diffraction analysis. Decreased activity of lime,[link widoczny dla zalogowanych], red mud ca (OH) 2 increased, decreased calcium titanate. This is because the activity of good lime, calcium and easy to produce calcium titanate titanium hydroxyl, active bad lime,[link widoczny dla zalogowanych], calcium is difficult to generate any form of titanium compounds, and to ca (OH) form. So that added during dissolution of CaO, the first step No. 5, 2007 generated light metal 23 ・ Ca (OH) 2, then reaction with other substances. If the reaction of titanium with titanium sodium calcium to prevent a surface of diaspore block layer, or the dissolution of bauxite as a catalyst in reaction. When using the low activity when lime, CaO into Ca (OH) 2 time longer, to be generated Ca (OH) 2, the chance to react with the red mud to drain the red mud in the Ca (OH) 2 content increased , less calcium titanate, alumina dissolution rate. Extending and increasing the dissolution time are beneficial to digestion temperature CaO into Ca (OH) 2, accelerated the dissolution results. Dissolution conditions worse, the greater the lime activity, it is because lime has a high response capability. Therefore, full attention should be in production activity on the Dissolution of lime to improve the efficient use of lime to reduce production costs. Especially the larger amount of lime Bayer case of lime, lime increased activity and efficiency of particular importance. 4 lime activity recommended the dissolution rate of bauxite a great influence on its dissolution (on the next page 14) the worse the conditions, the greater the activity of lime. But even in the current tube digestion conditions (temperature of 270 * (3, 40 minutes, Nk190g / L), high activity and low activity of lime lime dissolution rate difference between the 24.55%; and lime is also a difference of 2.4 in %. it is proposed to replace the current use of highly active lime coke burning lime shaft kiln to improve the activity of an effective method. References: [1] StumpfK., Baustoffindnstrie ,1973.5.1010 - 15. [2] Jin Taian. lime and its application 【J]. inorganic industrial ,1984.5,32 - 33. [3] RoberCY, Lightmetals198297 - 117. 【4] Chen Wankun. diasporic bauxite leaching technology enhanced (M]. Metallurgical Industry Press ,[link widoczny dla zalogowanych],1997.12,146 - 152. (Editor Wenjun) Figure 5 Effects of additives on electron micrographs of the products (2) additives can enhance not only the precipitation of aluminum hydroxide crystals, and can promote hydrogen agglomeration of alumina particles,[link widoczny dla zalogowanych], reducing the content of fine particles, increasing the average size of the product. (3) additives to change the aluminum hydroxide crystal growth process, the product of aluminum hydroxide particles form a mosaic structure, to improve product strength. References: [1】 complete poems, in Haiyan. alumina production process [M]. Beijing: Chemical Industry Press, 2005.184. [2] Wu Yusheng, complete poems, Yang Yihong. seed production of sand-like oxidation Progress in aluminum [J]. light metal. 2005,12:13-16. [3] JohannesH. DuesseID.UsinglmlyglycerinesintheBayerprocesstoincreasecrystalsizeoftheproduct (PJ, USA5312603 ,1994-05-17. 【4] IAiserADC.ChemicalAdditivesinBayerProduction.In: PA.LightMetals. Warrendale: TMS ,1991.155-158. [5] Wu Yusheng. in Haiyan, Yang Yihong,[link widoczny dla zalogowanych], complete poetry. additives on the decomposition of sodium aluminate solution during seed agglomeration and secondary nucleation of [z], 2005,56 (12 ) :1434 -2439. (Edited by Zhang Wenjun)
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