Method for preparing high-purity siliceous reinforcing agent by using rice hull ash as raw material

A technology of rice husk ash and white carbon black, which is applied in the direction of silicon dioxide and silicon oxide, can solve the problems of wasting resources, polluting the environment, and low value itself, and achieves the effects of eliminating pollution, simple operation, and improving purity

Inactive Publication Date: 2009-03-25
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

my country is a rice kingdom, with an annual output of more than 200 million tons of rice, accounting for 31.6% of the world's total annual rice output. After processing, about 40 million tons of rice husk can be obtained. Rice husk ash is the product of rice husk after burning and utilizing heat energy. The value itself is not high, and it is often treated as waste in rural areas, which not only wastes resources, but also pollutes the environment

Method used

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  • Method for preparing high-purity siliceous reinforcing agent by using rice hull ash as raw material
  • Method for preparing high-purity siliceous reinforcing agent by using rice hull ash as raw material
  • Method for preparing high-purity siliceous reinforcing agent by using rice hull ash as raw material

Examples

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Effect test

Embodiment 1

[0026] 1. Take 1000g of rice husk ash and pass it through a 100-mesh sieve, take 5L of deionized water, wash the rice husk ash and water for 20 minutes under constant stirring, and then centrifuge at a centrifugal speed of 3000rpm. After repeating the steps of washing and centrifuging twice, the concentration Pickle with 5L of 0.1mol / L hydrochloric acid for 2 hours, then filter and wash with water until the washing liquid is neutral (pH6.5), and then dry the washed rice husk ash in an oven at 90°C;

[0027] 2. Take 10g of washed and dried rice husk ash and mix it with 100mL of sodium hydroxide solution, the concentration of lye is 1.0mol / L, boil to 100°C for 2 hours, stir continuously during the reaction; then suction filter, and then use 100°C Wash with boiling water until the pH value is 6.5, collect the filtrate and washing liquid and concentrate in a vacuum rotary evaporator to obtain water glass. The concentration conditions are: temperature 50°C, rotation speed 300r / min, ...

Embodiment 2

[0032] 1. Take 1500g of rice husk ash and pass it through a 100-mesh sieve, take 5.5L of deionized water, wash the rice husk ash and water for 30 minutes under constant stirring, and then centrifuge at 3000rpm, repeat the steps of washing and centrifuging 3 times, use Pickle with 5.5L of hydrochloric acid with a concentration of 0.1mol / L for 2.5h, then filter and wash with water until the washing liquid is neutral (pH7.0), and then dry the washed rice husk ash in an oven at 90°C ;

[0033] 2. Take 12.5g of washed and dried rice husk ash and mix it with 125mL of sodium hydroxide solution, the concentration of lye is 1.5mol / L, boil to 100℃ for 2.5h, stir continuously during the reaction; Wash with boiling water at 100°C until the pH value is 7.0, collect the filtrate and washing liquid and concentrate in a vacuum rotary evaporator to obtain water glass. The concentration conditions are: temperature 55°C, rotation speed 300r / min, vacuum degree 0.1×10 5 Pa;

[0034] 3. Dilute th...

Embodiment 3

[0038] 1. Take 2000g of rice husk ash and pass it through a 100-mesh sieve, take 6L of deionized water, wash the rice husk ash and water for 40 minutes under constant stirring, and then centrifuge at a centrifugal speed of 3000rpm. After repeating the washing and centrifuging steps 4 times, the concentration Pickling with 6L of 0.1mol / L hydrochloric acid for 3 hours, and then washing with suction and water until the washing liquid is neutral (pH7.5), and then drying the washed rice husk ash in an oven at 90°C;

[0039] 2. Mix 15g of washed and dried rice husk ash with 150mL of sodium hydroxide solution, the concentration of lye is 2.0mol / L, boil to 100°C for 3 hours, stir continuously during the reaction; Wash with boiling water until the pH value is 7.5, collect the filtrate and washing liquid and concentrate in a vacuum rotary evaporator to obtain water glass. The concentration conditions are: temperature 60°C, rotation speed 300r / min, vacuum degree 0.1×10 5 Pa;

[0040] 3....

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Abstract

The invention relates to a method for preparing high purity silica white by using rice husk ash as a raw material, belonging to the field of fine inorganic chemical technology. The invention is characterized by comprising the following steps: taking the rice husk ash and water for washing under constant stirring, separation, pickling, leaching, and then undertaking washing till the lavage liquid is neutral and drying; taking the dried rice husk ash for being mixed and reacted with the sodium hydroxide solution, through leaching and washing; collecting filtrate and washing liquid so as to be condensed and obtain water glass; diluting the water glass which is obtained from the condensation and adding metal ion chelating agent, and next carrying out precipitation reaction after being fully dissolved, then a sediment is obtained by centrifugal separation; using ultrasound-assisted washing treatment, and then undertaking centrifugal separation and repeated washing; placing the washed sediment into a drying oven and then crushing and packaging the sediment so as to obtain the silica white product. The invention has simple process flow, easy operation, can improve the purity of the silica white, and is suitable for commercial process; moreover, the heavy metal content is less, which can completely replace or is even better than the market silica white product and also eliminates the environmental pollution of the rice husk ash.

Description

technical field [0001] The invention relates to a method for preparing high-purity white carbon black (hydrated silicon dioxide) by using rice husk ash as a raw material, and belongs to the technical field of fine inorganic chemicals. Background technique [0002] White carbon black, also known as hydrated silica, is an important fine inorganic chemical product, its appearance is white powder, and its main component is silica. The classic manufacturing methods of white carbon black in industry are mainly gas phase method and precipitation method. [0003] 1. Production of white carbon black by gas phase method [0004] In 1941, Germany Digosha Company successfully developed the technology of producing white carbon black by the chloride hydrogen-oxygen flame hydrolysis method of silicon or organosilicon, which is called the "Aerosil" method. This method is currently the main method for industrialized production of nano-scale oxides in developed countries. The production met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12
Inventor 陈正行丁开宇李晓瑄王韧
Owner JIANGNAN UNIV
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