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Method for preparing active carbon and rice hull tar by comprehensively utilizing rice hulls and co-producing water glass or silicon phosphate

A technology of activated carbon and water glass, applied in chemical instruments and methods, silicates, coke ovens, etc., can solve problems such as low product quality, low output, and high production costs

Inactive Publication Date: 2010-05-05
成如山
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the defects of low output, low product quality and high production cost in the method of preparing activated carbon and white carbon black from rice husks in the prior art, an industrialized method for comprehensively utilizing rice husks to produce activated carbon and other products is proposed to fill the current gap. gaps in industrial production

Method used

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  • Method for preparing active carbon and rice hull tar by comprehensively utilizing rice hulls and co-producing water glass or silicon phosphate
  • Method for preparing active carbon and rice hull tar by comprehensively utilizing rice hulls and co-producing water glass or silicon phosphate
  • Method for preparing active carbon and rice hull tar by comprehensively utilizing rice hulls and co-producing water glass or silicon phosphate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The rice husk is made into activated carbon with high adsorption value and high modulus water glass, the steps are:

[0038] Transport the pure rice husk to the stainless steel sieve on the top of the heating carbonization activation furnace, heat the furnace, adjust the voltage, make the temperature of the bottom of the furnace reach about 800 °C, and the temperature of the top of the furnace reach about 400 °C, and keep it stable, start the motor to make the steel The sieve vibrates horizontally so that the rice husks on the sieve are continuously sieved into the furnace and carbonized into charcoal husks. flow to the condenser. After the stainless steel sieve started to vibrate for about 20 minutes, about 180kg of charcoal husks (about 500kg of rice husks had been sieved) were piled up in the furnace. At this time, the carbonized rice husks were transferred to the pool filled with sodium hydroxide alkali solution.

[0039] According to the above steps, about 12 tons...

Embodiment 2

[0049] While producing gac and water glass, produce the method for rice husk tar, its step is:

[0050] When the hot gas in the furnace in Example 1 passes through the condenser, the gas is condensed into a liquid state for storage, and 1 ton of activated carbon can be produced to obtain about 1 ton of tar.

[0051] After preliminary testing, the tar contains about 15% of low boiling point (≤250°C) oil, 20% of medium boiling point (≤300°C) oil, 30% of high boiling point (≤400°C) oil, and ultra-high boiling point (≤600°C) oil 10%, the rest is solid oil residue (similar to asphalt).

Embodiment 3

[0053] Curing agent for making rice husk into water glass - silicon phosphate [Si 3 (PO 4 ) 4 or SiP 2 o 7 ] method, its steps are:

[0054] The carbonized rice husk produced by the steps of Example 1 falls into the pond filled with phosphoric acid solution while it is hot, and stirs rapidly. The concentration of phosphoric acid solution in the pond is about 40%, and the solution weight is 2.5% of the shell carbon weight in the pond. times (about 430kg). Heat to 100-150°C, stir and keep warm for 2-5 hours, filter to obtain filtrate and carbon residue, and obtain about 300kg of silicon phosphate aqueous solution after solid-liquid separation, with a concentration of about 38 degrees Baume and a density of about 1.43g / cm 3 . Dry the above-mentioned silicon phosphate aqueous solution to a paste, then put the paste into a high-temperature porcelain barrel (or crucible), cover it, and put it into a furnace. Raise the temperature to about 720°C at a rate of 60°C / hour, and kee...

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Abstract

The invention provides a method for preparing active carbon with strong adsorptivity and rice hull tar by comprehensively utilizing rice hulls and co-producing water glass or silicon phosphate, comprising the following steps of: slowly sifting the rice hulls into an activated carbonization furnace; carbonizing and depositing in the activated carbonization furnace to form a carbon shell and generate a gas; condensing the gas to obtain the rice hull tar; and processing the carbon shell by sodium hydroxide or a phosphoric acid to obtain the active carbon and the water glass or a silicon phosphate curing agent. The method has simple process, and the produced products have good quality, high output, low cost and no pollution, thereby large-scale industrialized production can be realized. The obtained rice hull active carbon contains no heavy metal ion, i.e. lead, cadmium, arsenic, mercury, and the like which are toxic to human bodies and other toxic and harmful substances and is a purifying agent, a decolorizing agent and a catalyst which are urgently needed in the fields of foods, medicines and environmental protection; the rice hull curing water glass is a non-toxic harmless aqueous inorganic adhesive and has wide application range; in addition, the rice hull tar is renewable biological energy. The method has good social benefit and economic value.

Description

technical field [0001] The invention relates to a method for comprehensive development and utilization of rice husks, in particular to a method for preparing activated carbon (including powder and granule) and rice husk tar from rice husks, and co-producing water glass and silicon phosphate. Background technique [0002] Rice husk is rich in carbon, SiO 2 And carbon, hydrogen and oxygen organic matter, in addition also contains a variety of trace elements (see Table 1), of which, calcium 0.03-0.22%, iron 0.005-0.08%, potassium 0.06-0.4%, sodium 0.015-0.24%, magnesium 0.015- 0.03%, phosphorus 0.015-0.2%, molybdenum 0.03%, aluminum 0.003%, hardly any substances harmful to human physical and mental health. [0003] Table 1. Composition of rice husk [0004] name Carbon (C) Silicon dioxide (SiO 2 ) Rice husk oil (carbon hydrogen oxygen organic thing) Vegetable trace element watery quantity Approx. w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/08C10B53/02C01B33/32C01B33/00
CPCC10B53/02C01B31/081Y02E50/14C01B31/12C01B32/324C01B32/342Y02E50/10
Inventor 成如山成果
Owner 成如山
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