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Di simultaneous silicon removal of reed pulp black liquor Study


2.0l Sulfate ash% 34.8633.8233.6033.25 <Hunan made ~) 2000 1 3. 3.1 Test results and analysis of silicon content of black liquor and the value of the relationship between VIE VIE values: the black liquor solids concentration to 40% concentration on the magnetic crucible, is heated to 300 ℃ in horse-rich burning oven 1 hour Remove the crucible after the measured expansion of the volume of black liquor, according to the concentration of black liquor solids per gram of black liquor combustion of the volume expansion of the number (ml / g). The agent without addition of silicon dioxide base point in the cooking liquor, and the remaining three different dosage than silicon dioxide reduction in the rate of black liquor and the addition of silicon dosage of 4 different series of reed pulp black liquor by the VIE values in Table 2. Bandits in the absence of 21 units were wrapped in black liquor in black liquor VIE value of the silica plays a decisive role, because it can form a black liquor and other substances in the dense material. Difficulties in expanding the black liquor, it can be seen from Table 2. If four series of black liquor in the silicon dioxide as the abscissa, to VIE is y coordinates, the relationship between silica and VIE values shown in Figure l. 10 【CP) 1 can be seen from Figure 1. If the silicon dioxide removal rate of 50% by the VIE reed pulp black liquor can increase the value of 1.85 times. 3.2 The silicon content of black liquor in relation to degree and A Brighter Summer Day 5. . O ~ 45oIl25 bang l5 careless 30'05o607080901oo (℃) without pay attention around 2 silicon agent. Black liquor temperature and by degrees, the relationship between the degree kwu ,~_', \,,, L, 11 \, \ 1. \,, 54 careless 45. Bang 25. ol15. Bang 30405o ∞ 708O9o100 (Diao Yu Si Jing Wai 3; bn, k the amount of 1.0%. ■ liquid chu and concentration, the viscosity of the United States Department of 55432 (Hunan made ~ E) 2000 No. 1 (CP) 1110 \, \ \ L, \, '1 -,,-'---.~'-, 5404525150x ∞ 4 口 port 50 that is 0B09 100 (around 4 barrier silicon addition amount was 2.0%. black liquor Li and concentration, the viscosity of the U.S. Department can be seen from the chart, the black liquor at low concentrations, viscosity or less (four series of black liquor in the solid concentration of 15%, 25% of the temperature and viscosity curves almost overlap), with the evaporation of black liquor, when more than 80% concentration of black liquor, that is more than 40% solid content, the addition of silicon increases the viscosity of black liquor agent significantly (cP) 1110, L \ \, L,, \ L-'~,,--~-'~, h ----- such as adding a 54.Ol45.Ol2t15O ■ 5 6. plus B09oloo'q ring in addition silica addition amount 5 was 3.0%. Xinjiang and concentration of black liquor, the viscosity of the U.S. Department of increase than the addition of silicon is not the low dose. the same concentration, without addition of silicon agent of the curve at the top, plus 3.0% addition of silicon agent at the bottom. the four series of black liquor at 30 ℃, 60 ℃, 9O ℃ these three typical temperatures, the viscosity values listed in Table 3 with Table 2 and Table 3, when the silica is reduced by 40%. black Table 3 barrier silicon black liquor in a different dosage of 30 ℃, 60 ℃, 90 ℃ Viscosity viscosity under the unit: CP addition to the amount of silicon added Jing% 0l02O3.O,,,, the temperature ℃ 30609030,6090306090306090 concentration% ,, \ l57646535425422530ll625104249423844541822l285l60819564l436l5454136ll384554268O0745073Ol532O3l20520l250025344081068Ol398257 fluid viscosity can be reduced by 40% to 60%, and with the viscosity increases, the greater the degree of viscosity reduction. 4. Conclusion 4.1 agent after the addition of silicon, silicon dioxide black liquor reduce the rate of up to 40.4%, the minimum is also of 37.I%. different dosage than silicon, the black liquor at low concentrations, no significant changes in viscosity, when the black liquor solids concentration up to 40%, the black liquor significant changes in the viscosity began, and with the black liquor solids concentration, the greater the degree of viscosity reduction. Therefore, the synchronization addition of silicon can increase the concentration of black liquor into the furnace 6, and the volume swelling coefficient with the increase, to improve the black combustion properties of liquid. 4.2 When cooking, the addition of silica ash slurry agents obtained a substantial increase, no change in other indicators, therefore, simultaneous addition of silicon no negative effect on the pulp. 4.3 the silica reduced, improving the combustion properties of black liquor, green liquor clarification would have been enhanced, which will deducted from the mud under a good foundation for recovery. In short, simultaneous silicon removal of black liquor alkali recovery can not only enhance the economic benefits, can also environmental benefits society
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