Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for manufacturing active carbon by using rice hulls and stalks as main raw materials

A technology for activated carbon and straw, applied in the field of activated carbon preparation, can solve the problems of high production cost, poor adsorption performance, low adsorption value, etc., and achieve the effect of low production cost

Inactive Publication Date: 2010-05-19
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
View PDF0 Cites 31 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of coal to produce activated carbon has the following obvious defects: First, the energy consumption is too high, and coal itself is a non-renewable energy source, resulting in high production costs; second, the activated carbon made of coal contains heavy metals or harmful elements such as lead, mercury, and arsenic Use is limited (for example, for water purification, it may lead to secondary pollution of the purified water source)
[0006] The use of rice husks to prepare activated carbon has been reported a long time ago, but so far, the technology of preparing activated carbon from rice husks still has low yield, poor product adsorption performance (low iodine adsorption value and methylene blue adsorption rate), high production costs, etc. defect
In addition, due to the low ignition point of straw, corn stalks, sorghum stalks and other straws, they are often burned before carbonization when preparing activated carbon. Activated carbon is prepared, but the adsorption value is too low to be popularized and applied

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Raw material pretreatment: crush dry rice husks and cotton stalks respectively, pass through a 60-mesh sieve to obtain rice husk powder and straw powder, and mix the rice husk powder and straw powder evenly in a weight ratio of 1:4 to obtain rice Shell powder and straw powder mixture;

[0018] (2) Carbonization treatment: the temperature in the carbonization activation furnace equipped with a heating device is set to 900 ° C, and 1350 kg of rice husk powder and straw powder mixture is poured into the furnace volume per cubic meter per hour through the furnace top vibration device, so that The mixture of rice husk powder and straw powder instantly carbonizes and sinks into the bottom of the furnace to form charcoal dust; the released gas is recycled;

[0019] (3) Acid treatment: prepare respectively mass concentration of 2% hydrochloric acid aqueous solution and 4% phosphoric acid aqueous solution, place the charcoal powder obtained in step (2) in an acid and alkali ...

Embodiment 2

[0023] (1) Raw material pretreatment: crush the dried rice husk and straw respectively, pass through a 50-mesh sieve to obtain rice husk powder and straw powder, and mix the rice husk powder and straw powder evenly in a weight ratio of 1:3 to obtain rice husk Flour and straw powder mixture;

[0024] (2) Carbonization treatment: the temperature in the carbonization activation furnace with heating device is set to 850 ° C, and 1500 kilograms of rice husk powder and rice straw powder mixture are poured into the furnace volume per cubic meter per hour through the furnace top vibration device, so that The mixture of rice husk powder and straw powder instantly carbonizes and sinks into the bottom of the furnace to form charcoal powder;

[0025] (3) Acid treatment: prepare respectively mass concentration of 1% hydrochloric acid aqueous solution and 3% phosphoric acid aqueous solution, place the charcoal powder obtained in step (2) in an acid-alkali-resistant and high-temperature-resi...

Embodiment 3

[0029] (1) raw material pretreatment: the dried rice husk and corn stalk are pulverized respectively, and cross a 70-mesh sieve to obtain rice husk powder and corn stalk powder, and the rice husk powder and corn stalk powder are mixed evenly in a weight ratio of 1:2, Obtain rice husk powder and corn stalk powder mixture;

[0030] (2) Carbonization treatment: the temperature in the carbonization activation furnace with heating device is set to 950 ° C, and 1200 kg of rice husk powder and corn stalk powder mixture is poured into the furnace volume per cubic meter per hour through the furnace top vibration device, Instantly carbonize the mixture of rice husk powder and corn stalk powder and sink into the bottom of the furnace to form charcoal powder;

[0031] (3) Acid treatment: Prepare respectively 3% hydrochloric acid aqueous solution and 5% phosphoric acid aqueous solution with a mass concentration, place the charcoal powder obtained in step (2) in an acid-alkali-resistant and...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Adsorption valueaaaaaaaaaa
Adsorption valueaaaaaaaaaa
Adsorption valueaaaaaaaaaa
Login to View More

Abstract

The invention provides a method for manufacturing active carbon by using rice hulls and stalks as main raw materials. The method comprises the following steps of: (1) pretreatment of raw materials; (2) carbonizing treatment; (3) acid treatment; and (4) alkali treatment, and screening. After test performed by an active carbon test method specified in the national standards (GB / T 13803.2-1999), the iodine sorption value of the rice hull-stalk active carbon is over 1,000mg / g, and the adsorption rate of methylene blue is over 135mg / g; and the production cost is low.

Description

technical field [0001] The invention relates to a method for preparing activated carbon, in particular to a method for preparing activated carbon by using rice husks and straws as raw materials. Background technique [0002] Activated carbon is a carbonaceous adsorption material with a well-developed pore structure. It has good chemical stability and mechanical strength, acid resistance, alkali resistance, and heat resistance. Based on its adsorption characteristics and physical and chemical properties, it can be used in various gas and liquid media. The useful or useless components are enriched, recovered, refined and purified, and can be easily regenerated after the adsorption saturation fails, and are widely used in water treatment, chemical pharmaceuticals, mining, gas purification, food processing, sugar decolorization and gas Solvent recovery and other fields. Some specially treated and specially processed activated carbons can also be used as high-efficiency desulfur...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C01B31/12
Inventor 林亲录陈冠群李忠海李丽辉
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com