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A method for removing silicon from modified bentonite combined with quicklime green liquor
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A technology of bentonite and quicklime, applied in the field of papermaking, can solve the problems of silicon interference, calcium carbonate is difficult to calcine calcium oxide, etc., and achieves the effects of low cost, reduced silicon interference, and reduced dosage.
Active Publication Date: 2016-04-13
SHAANXI UNIV OF SCI & TECH
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Problems solved by technology
Due to the problem of silicon interference, a large amount of quicklime is often required for causticization, and the causticized calcium carbonate is difficult to be calcined into calcium oxide in the calciner
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Embodiment 1
[0013] A method for removing silicon from modified bentonite synergistic quicklime green liquor, comprising the following steps:
[0014] 1) Mix 10g of modified bentonite and 20g of quicklime, put it into 1L green liquor of clarified causticizing section green liquor, heat to 100°C, and stir for 10min;
[0015] 2) Stand still for 10 minutes, filter, and the silicon removal rate of the filtered silicon removal green liquid can reach 70%, and the pH of the clear liquid is 12.81.
Embodiment 2
[0017] A method for removing silicon from modified bentonite synergistic quicklime green liquor, comprising the following steps:
[0018] 1) Mix 20g of modified bentonite and 10g of quicklime, put it into 1L of clarified causticizing section green liquor, heat to 95°C, and stir for 20min;
[0019] 2) Stand still for 30 minutes, filter, and the silicon removal rate can reach more than 80%. The silicon content of the clear liquid is 1.17g / L.
Embodiment 3
[0021] A method for removing silicon from modified bentonite synergistic quicklime green liquor, comprising the following steps:
[0022] 1) After mixing 39g of modified bentonite and 15g of quicklime, put it into the clarified 1L causticizing section green liquor, heat to 95°C, and stir for 30min;
[0023] 2) Stand still for 20 minutes, filter, and its silicon removal rate can reach more than 85%. Take the clear liquid and measure its silicon content to be 1.94g / L.
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Abstract
A method for removing silicon from modified bentonite combined with quicklime green liquor, comprising the following steps: 1) mixing 10-40 g of trivalent metal salt modified bentonite with 5-20 g of quicklime (80%-90% active calcium oxide content) In 1L of clarified green liquor, heat to 90-100°C and stir in the silicon removal tank for 10-30 minutes; The silicon green liquid has a silicon removal rate of 70%-95%; the silicon removal rate of the green liquid of the present invention is high, and the pH change of the green liquid is small, which improves the economic benefits of the enterprise.
Description
technical field [0001] The invention belongs to the technical field of papermaking, in particular to a method for removing silicon from modified bentonite in conjunction with quicklime green liquor. Background technique [0002] Non-wood fiber papermaking raw materials are an important renewable fiber resource in my country. Due to the limitation of resources, most of the non-wood raw materials are used for pulping in my country at this stage, such as bamboo and wheat straw. Due to the special reasons of the non-wood fiber raw material itself, the content of hemicellulose is higher than that of wood, there are more miscellaneous cells, and the ash content is high. Silica accounts for more than 60% of the ash content, resulting in the problem of "silicon interference" in the alkali recovery process. It is mainly reflected in the sections of evaporation, causticization and lime recovery. In the causticizing section, there will be CaSiO in the causticizing reaction of green l...
Claims
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