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 Wysłany: Czw 14:24, 06 Sty 2011 Temat postu: ugg italia Sand Content on the old water glass san |
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Sand Content on the old water glass sand regeneration of dry
NaO residues reclaimed sand. (2) take 1000g sand, 10min after the release the microwave dryer in dry cooling, the first measurement of the used sand weighed 100g initial content of NaO, and then weighed 100g and used sand to release the humidity of the desiccator 82RH , when asked at regular intervals weighing out the weight of sand sample, count the quality and the quality of the original ratio. 3 Test results and analysis 3.1 Water Content on the regeneration of used sand residue anvil NaO NaO different initial concentration of sand in the old law by the thousands after regeneration of the relationship between NaO residues can be seen in Figure 1, NaO residues With the old sand increases the water content, and sand reclamation stripping rate. For the initial content of 0.6 NaO old sand (curve b), when the old sand water content was 0.7,[link widoczny dla zalogowanych], the amount of recycled sand residue Na2O 0.3, Tuomo regeneration rate of 50; water content of 0.3 ,[link widoczny dla zalogowanych], NaO 0.18 residues, renewable Tuomo rate 70; water content of 0.2, Na. O, 0.16 residues, renewable Tuomo rate 73. If the initial NazO content is different, this water content caused by the change in the rate of Na residues are different, the higher the initial NaO content, the faster the rate of change. Can be seen from the figure used sand water content less than 0.3, can guarantee the effect of mechanical dry recycling. l sound technical set t%) Figure 1 and regeneration of used sand water content of sand NazO residues lining the beginning of a relationship between a volume of 0.29-b + Na beginning of NazO lining 06 of the old sand water volume, the old sand in the water glass adhesive conjunctiva and colloidal silica dissolved in water to produce sodium silicate gel Na2SiO3 + SiO2 · H2O + H2O = Na2O · SiO2 · nH2O the surface of sodium silicate sodium silicate gel membrane with sand mixed, so that the toughness of water-glass film is not conducive to Dry blow to the film. Therefore,[link widoczny dla zalogowanych], the moisture content the greater the regeneration worse. Therefore, changes in water content of the used sand can be recycled directly reflect the degree of difficulty, lower water content can improve the regeneration of used sand stripping rate. 3.2 silicate absorption features old anvil Figure 2 is the old water glass sand (initial NaO content of 0.6) of the moisture characteristic curve. Can be seen that the amount of used sand in the 12h water rapidly growing base of 12 to 18h slow growth and gradually saturated. In the first 1h fastest in water, can increase the o. 1 of water, and then slow down water absorption, 4h after the water 0.2,6 h up to O. 3, the saturated absorption time [hI Figure 2 O. The initial Na content 6 1 water glass sand Sand moisture absorbing mechanism: the old water glass sand the surface membrane of sodium ions and the presence of hydroxyl group generated moisture, sodium silicate in the water caused by the chemical adsorption, and then absorption of water in the hydroxide ion as catalyst, and silicon-oxygen bond. Without the coordination number of Na saturation, can be coordinated with water molecules, leading to Na and Si-OH bond breaking of electrostatic binding, and Na + to the water table. - OHsi-oH / l / {lOHO10HzoHIII. / ... HO-_si-0 ... Na-Ho-Si-0 ... · Na + - oH, II \ 0ii0iiOH2 \ I \ IsiO-0Hsi - oH the same time, water molecules can also link directly with the sj-O units, so that Disconnect the network structure, silicate network structure fracture. iSiESi-OH \ 0 + H2O/iSi! Si-oH,[link widoczny dla zalogowanych], of course, the initial water glass Sand Na: O content is higher, the stronger the absorption capacity of the practice in the production of sodium silicate used sand content is generally the initial NaO 0.5 to 0.9, after 12h storage in the natural water content of the used sand about 0.6 to about 1.0. 4 Conclusion The existence of sodium silicate absorbent used sand can make the old sand water at room temperature maintained at between 0.7 to 1.0, while the increase in water content of the remnants of the old water glass sand and water in the end units, have adhesive properties, increases the difficulty of regeneration. In order to improve the regeneration effect, must be regenerated used sand before drying, so that the water content before the sand reclamation is less than 0.2, while the old water glass sand by the impact of water absorption, should be within a timely manner has been baking in the 4h dry sand to dry the old regeneration, to ensure the regeneration of water in front of less than 0.3,[link widoczny dla zalogowanych], thus reducing the water content of the water glass effect on regeneration. References: [1] Ran Phi. Port] Huazhong University of Technology, 1997 (1): 18. [2] Ran Phi, et al. [J]. Chinese poetry survived surgery equipment and Zhu, 1997. (3) 55. [3] Shung Chen Sui. Silicified wood production and application of co-[M]. Beijing Chemical Industry Press Mu l987. Xiu Qin ¨ ¨ 0. (. ') ● * If the amount of 7m
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