Biomass ash resource utilization method

A technology for biomass ash and resource utilization, which is applied in the field of solid waste resource utilization, can solve the problems of neglecting pollution, inability to achieve sufficient extraction, and low molecular sieve quality, reducing environmental pollution, reducing preparation costs, and improving single kettles. The effect of yield

Active Publication Date: 2018-04-20
WUHAN KAIDI ENG TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current resource utilization of biomass power plant ash mainly has the following problems: 1) focus on the extraction of silicon and carbon from biomass ash (especially rice husk ash), and the products have achieved high purity and excellent physical and chemical properties, However, the biomass ash has not been fully utilized, and the pollution of the additives to the environment has been ignored; 2) Comprehensive utilization of rice husk combustion waste gas and waste residue, using sodium carbonate and carbon dioxide in the waste gas as acid-base media to prepare silica, and at the same time Activated carbon is a by-product, the process is economical and environmentally friendly, but the silicon in the waste residue cannot be fully extracted; 3) There are also some reports on the use of biomass ash to prepare molecular sieves, but the quality of the obtained molecular sieves is not high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The specific process flow of biomass ash resource utilization method is as follows: figure 1 Shown:

[0047] 1) Soak a certain amount of finely ground biomass ash in deionized water (solid-to-liquid ratio 1:10) for 1 hour, then filter and dry to obtain about 9.5g of primary biomass ash;

[0048] 2) Mix the primary biomass ash and 1.5mol / L nitric acid in a mass ratio of 1:10, react at 60°C for 2 hours, filter, wash and dry to obtain primary biomass ash and primary acid waste liquid (acid liquid recycling);

[0049] 3) Mix the primary biomass ash with 2mol / L potassium hydroxide at a mass ratio of 1:10, react at 90°C for 2 hours, and obtain water glass and residue after filtration (high-quality activated carbon can be obtained after acid washing and activation of the residue);

[0050] 4) Take part of the water glass and inject carbon dioxide until the pH value of the solution is 10, then add a flocculant (the mass ratio of the flocculant to the solution is 1:60) until th...

Embodiment 2

[0059] Front steps 1)~5) are identical with embodiment 1;

[0060] 6) Mix water glass and nano-silicon dioxide in a certain proportion as a silicon source, and add a certain amount of aluminum source, deionized water and seed crystals (counted as CrSd) respectively, and the molar ratio of the synthetic molecular sieve is 1SiO 2 :0.01Al 2 o 3 :0.15OH - :10H 2 O:xCrSd (please write down the specific value of X), mix water glass and silicon dioxide in a certain proportion (liquid-solid mass ratio L / S=0.3), add deionized water, alumina and CrSd, CrSd / SiO 2 =0.06 (wherein the SiO in the seed crystal and the silicon source 2 mass ratio), and stirred at 60°C for 4h, crystallized in a reaction kettle at a temperature of 160°C, and crystallization time of 30h, filtered, washed and dried to obtain a porous ZSM-5 molecular sieve;

[0061] Step 7) is the same as in Example 1.

[0062] The XRD pattern of the crystallization product of embodiment 2 is shown in figure 2 . The relati...

Embodiment 3

[0064] Front steps 1)~5) are identical with embodiment 1;

[0065]7) Mix water glass and nano-silicon dioxide in a certain proportion as a silicon source, and add a certain amount of aluminum source, deionized water and seed crystals (counted as CrSd) respectively, and the molar ratio of the synthetic molecular sieve is 1SiO 2 :0.01Al 2 o 3 :0.15OH - :10H 2 O:xCrSd (please write down the specific value of X), mix water glass and silicon dioxide in a certain proportion (liquid-solid mass ratio L / S=0.7), add deionized water, alumina and CrSd, CrSd / SiO 2 =0.02 (wherein the SiO in the seed crystal and the silicon source 2 mass ratio), and stirred at 60°C for 4h, crystallized in a reaction kettle at a temperature of 160°C, and crystallization time of 30h, filtered, washed and dried to obtain a porous ZSM-5 molecular sieve;

[0066] Step 7) is the same as in Example 1.

[0067] The XRD pattern of the crystallization product of embodiment 3 is shown in figure 2 . The relativ...

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Abstract

The invention discloses a biomass ash resource utilization method which comprises the following steps: 1) pretreating biomass ash so as to obtain primary biomass ash; 2) soaking the primary biomass ash with an acid liquid so as to obtain first biomass ash; 3) melting and boiling the first biomass ash with an alkali liquid so as to obtain sodium silicate; 4) introducing a carbon dioxide gas into apart of the sodium silicate, neutralizing till the pH value of the solution is 9-11, further adding a flocculant according to a mass ratio of the flocculant to the solution of 1:(40-100), performing flocculation precipitation, filtering, and drying so as to obtain a solid sample; 5) roasting the solid sample so as to obtain nano silicon dioxide; 6) taking the rest sodium silicate and the nano silicon dioxide as a silicon source, and performing synthesis with an aluminum source, deionized water and crystal seeds, thereby obtaining a porous ZSM-5 molecular sieve. By adopting the method, the porous ZSM-5 molecular sieve of high quality is prepared, the waste residue treatment efficiency is improved, zero emission and zero pollution are achieved, and efficient utilization of biomass raw materials is achieved.

Description

technical field [0001] The invention relates to solid waste resource utilization technology, in particular to a biomass ash resource utilization method. Background technique [0002] Biomass is a green and renewable resource, and its efficient and clean utilization has always been a research hotspot. According to my country's biomass energy development plan, the total amount of biomass energy resources that can be used as biomass energy is about 460 million tons of standard coal per year, but the amount used is only 22 million tons of standard coal, and a large amount of biomass is discarded as waste or used as primary fuel , which wastes resources and pollutes the environment. At present, biomass energy is mainly used for heat supply, power generation and synthetic chemical industry. Biomass fast pyrolysis power generation and synthesis gas technology can convert abundant biomass resources into huge amounts of electrical energy and biological chemicals. However, after biom...

Claims

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Application Information

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IPC IPC(8): C01B39/38C01B32/324C05G1/00
CPCC01B39/38C01P2002/72C01P2004/03C01P2004/61C01P2006/12C01P2006/14C05B7/00C05C3/00C05G1/00
Inventor 李国栋陈建刚龚焱管肖肖杜丁敖灿
Owner WUHAN KAIDI ENG TECH RES INST CO LTD
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