Method for co-production of zeolite molecular sieves, high-grade activated carbon and industrial alkali metal salt from wastes in biomass power plants
A technology of zeolite molecular sieve and alkali metal salt, which is applied in the direction of alkali metal carbonate, alkali metal compound, chemical instrument and method, etc., can solve the problems of high production cost, environmental pollution of waste acid and waste alkali, and achieve operation time Short, high value-added products, the effect of environmental protection
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Embodiment 1
[0040] (1) Using NaOH to prepare silica sol and low-grade activated carbon
[0041] Take 8g of power plant rice husk ash crushed to 100 mesh and put it into a hydrothermal synthesis kettle, add 50g of NaOH solution with a concentration of 0.5mol / L, put it into a stirrer, seal it mechanically, put it into an oil bath, and conduct a hydrothermal treatment at 150°C for 3h . Then, wash with water and filter to obtain 50 mL of filtrate A (silica sol); wash the filter residue A with water until neutral, and dry to obtain 2 g of low-grade powdered activated carbon. The specific surface area of this kind of activated carbon is 800~1200m 2 / g, the average particle size is about 20 microns, and the methylene blue adsorption value reaches 10-13mL / 0.1g, which meets the first-class activated carbon standard of the Ministry of Forestry.
[0042] (2) Synthesis of NaY zeolite molecular sieve
[0043] Take 5mL of the silica sol in step ①, according to 0.1Al 2 o 3 : SiO 2 : 1.067Na 2 O...
Embodiment 2
[0049] (1) Using KOH to prepare silica sol and high-grade activated carbon
[0050] Take 8g of power plant rice husk ash crushed to 100 mesh and put it into a hydrothermal synthesis kettle, add 50g of KOH solution with a concentration of 1mol / L, put it into a stirrer, seal it mechanically, put it into an oil bath, and conduct hydrothermal treatment at 150°C for 3h. After filtration, 3 g of filter residue A and 45 mL of filtrate A (silica sol) were obtained. Fully mix 4.5g of KOH powder with filter residue A, activate at 450°C for 1 hour; wash with water until neutral and dry to obtain 2g of high-grade powdered activated carbon. The specific surface area of this kind of activated carbon is 2000~2500m 2 / g, the average particle size is about 10 microns, and the methylene blue adsorption value reaches 20-30mL / 0.1g, which is much higher than the national first-class activated carbon standard.
[0051] (2) Synthesis of 3A type zeolite molecular sieve
[0052] Take 30mL of sili...
Embodiment 3
[0058] (1) Using KOH to prepare silica sol and medium-grade activated carbon
[0059] Using wheat husk ash as raw material, 1mol / L KOH was used to prepare silica sol and activated carbon, and the specific steps were the same as in Example 1. The activated carbon prepared by this method has a specific surface area of 1200-1800m 2 / g, the average particle size is about 18 microns, and the methylene blue adsorption value reaches 12-15mL / 0.1g, which is slightly higher than the national first-class activated carbon standard.
[0060] (2) Synthesis of high silicon ZSM-5 zeolite molecular sieve
[0061] Take 30mL of silica sol in step ①, according to 0.005Al 2 o 3 : SiO 2 : 0.10K 2 O: 0.015TPABr: 40H 2 Prepare molecular sieve synthesis liquid at a molar ratio of O, and violently heat it at room temperature for 2 to 3 hours; then, pour the synthesis liquid into a hydrothermal synthesis kettle, and crystallize at 180°C for 12 hours; after cooling, filter and wash with distilled...
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