Green method for comprehensively utilizing biomass ash

A biomass ash, green technology, applied in the field of comprehensive utilization of agricultural waste, can solve the problems of residual rice husk ash, pollution, waste of resources and the environment, etc.

Active Publication Date: 2015-11-04
DALIAN MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the surface, the pollution of rice husks to the environment has been solved, and some resources in rice husks have also been utilized...

Method used

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  • Green method for comprehensively utilizing biomass ash
  • Green method for comprehensively utilizing biomass ash
  • Green method for comprehensively utilizing biomass ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A green method for comprehensive utilization of biomass ash, see the process flow image 3 .

[0033] ①. The wheat straw ash obtained from the biomass power plant is soaked in 0.5mol / L nitric acid solution at a solid-liquid ratio of 1:7 (g:mL), washed with distilled water and dried.

[0034] ②. Weigh a certain amount of clean raw materials obtained in step ① in the reaction vessel, supplement 2mol / L KOH solution according to the solid-to-liquid ratio of 1:6 (g:mL), seal the reaction vessel, and start timing from room temperature to 90°C 3h. After the reaction was completed, the extract was collected by filtration with a Buchner funnel. Dilute the silicate extract with distilled water and ethanol at a volume ratio of extract:distilled water:alcohol of 1:1.5:1. Then, under the condition of continuous stirring, add 2mol / L phosphoric acid solution to the above diluent at a rate of 3mL / min with an acid burette until the pH value of the diluent is 8, and continue stirring f...

Embodiment 2

[0041] ①. Soak the rice husk ash obtained by the combustion method with 0.5mol / L phosphoric acid solution at a solid-liquid ratio of 1:7 (g:mL), wash with distilled water and dry.

[0042]②. Weigh a certain amount of clean raw materials obtained in step ① in the reaction vessel, supplement 2mol / L KOH solution according to the solid-to-liquid ratio of 1:6 (g:mL), seal the reaction vessel, and start timing from room temperature to 90°C 3h. After the reaction was completed, the extract was collected by filtration with a Buchner funnel. Dilute the silicate extract with distilled water and methanol according to the volume ratio of extract:distilled water:alcohol at 1:1.5:1. Then, under the condition of continuous stirring, add 2mol / L nitric acid solution to the above diluent at a rate of 3mL / min with an acid burette until the pH of the diluent is 8, and continue stirring for 1.5h. The silica microspheres with low specific surface area were obtained by centrifugation, and were vac...

Embodiment 3

[0046] ①. The wheat straw ash obtained from the biomass power plant is soaked in a 1mol / L phosphoric acid solution at a solid-liquid ratio of 1:7 (g:mL), washed with distilled water and dried.

[0047] ②. Weigh a certain amount of clean raw materials obtained in step ① into the reaction vessel, supplement 3mol / L KOH solution according to the solid-to-liquid ratio of 1:6 (g:mL), seal the reaction vessel, and start timing from room temperature to 90°C 2h. After the reaction was completed, the extract was collected by filtration with a Buchner funnel. Dilute the silicate extract with distilled water and ethylene glycol in a volume ratio of extract:distilled water:alcohol at 1:2:1. Then, under the condition of continuous stirring, add 3 mol / L nitric acid solution to the above diluent at a rate of 2 mL / min with an acid burette until the pH of the diluent is 7, and continue stirring for 1.5 h. The silica microspheres with low specific surface area were obtained by centrifugation, ...

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Abstract

The invention discloses a green production technology for preparing silicon dioxide pellets with low specific surface areas, activated carbon and nitrogen-phosphorus-potassium compound fertilizers by utilizing biomass ash. The green production technology comprises the steps of: soaking raw materials of the biomass ash with acid so as to remove impurities introduced in the process of agricultural production, extracting silicon dioxide from clean biomass ash with a KOH solution, and then precipitating the silicon dioxide pellets with low specific surface areas from a diluted extracting solution with acid liquor. The biomass ash residues after silica removal are directly dried and activated for preparing the activated carbon, and waste liquor produced in the whole preparation process is uniformly blended for preparing the nitrogen-phosphorus-potassium compound fertilizers. All the components in the biomass ash and various chemical reagents put in the biomass ash are fully utilized.

Description

technical field [0001] The invention relates to the comprehensive utilization of various components of biomass ash, and belongs to the field of comprehensive utilization of agricultural wastes. Background technique [0002] Biomass ash mainly comes from the combustion and pyrolysis of agricultural waste. Taking rice husks as an example, according to statistics, China's current annual rice output has exceeded 180 million tons, accounting for about one-third of the world's total annual output, ranking first in the world. In the process of rice processing, a large amount of rice husks will be produced, and each ton of rice can produce about 200kg of rice husks. These rice husks have a low natural bulk density (about 120Kg / m 3 ), which brings great inconvenience to transportation. On the other hand, most rice processing companies do not have a reasonable and effective process to utilize rice husks, so many rice husks are discarded as agricultural waste. With the development ...

Claims

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Application Information

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IPC IPC(8): C01B33/12C01B31/08C05F7/00
CPCY02A40/20Y02E50/30Y02W30/40
Inventor 孙俊才崔金龙李嵩文钟晟季世军
Owner DALIAN MARITIME UNIVERSITY
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