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Novel process for co-production of high-quality rice husk-based activated carbon and wet-process sodium silicate

A high-quality technology based on activated carbon, used in silicates, alkali metal silicates, chemical instruments and methods, etc., to achieve the effects of high thermal energy utilization efficiency, low degree of lattice formation, and easy extraction

Pending Publication Date: 2021-12-17
NANPING YUANLI ACTIVE CARBON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention provides a new process for the joint production of high-quality rice husk-based activated carbon and wet-process sodium silicate to solve the problem of how to simplify the process and simultaneously realize the preparation of high-quality activated carbon and high-modulus water glass

Method used

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  • Novel process for co-production of high-quality rice husk-based activated carbon and wet-process sodium silicate
  • Novel process for co-production of high-quality rice husk-based activated carbon and wet-process sodium silicate
  • Novel process for co-production of high-quality rice husk-based activated carbon and wet-process sodium silicate

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Embodiment 1

[0034] A new process for the joint production of high-quality rice husk-based activated carbon and wet-process sodium silicate, comprising the following steps:

[0035] A. Rice husk pretreatment:

[0036] The rice husk raw material is screened to remove impurities, such as large specific gravity sand, bricks, metal pieces and other impurities.

[0037] B. Preparation of rice husk activation material:

[0038] Reaction principle: C+H 2 O→CO+H 2

[0039] Rice husks with 12% moisture and 15% ash were put into a carbonization furnace, and a reducing gas at 600°C was introduced for carbonization. The reducing gas came from the high-temperature tail gas of the activation section, and the carbonization time was 2 hours. Use flammable gas anoxic combustion to heat steam to 850°C for activation. The activation time is 2 hours. The steam accounts for 40% of the total activation gas, and the semi-finished activation material is obtained.

[0040] C. Preparation of high modulus sodiu...

Embodiment 2

[0048] A new process for the joint production of high-quality rice husk-based activated carbon and wet-process sodium silicate, comprising the following steps:

[0049] A. Rice husk pretreatment:

[0050] The rice husk raw material is screened to remove impurities, such as large specific gravity sand, bricks, metal pieces and other impurities.

[0051] B. Preparation of rice husk activation material:

[0052] Reaction principle: C+H 2 O→CO+H 2

[0053] Rice husks with 12% moisture and 15% ash were put into a carbonization furnace, and a reducing gas at 600°C was introduced for carbonization. The reducing gas came from the high-temperature tail gas of the activation section, and the carbonization time was 2 hours. Use flammable gas anoxic combustion to heat steam to 900°C for activation. The activation time is 3 hours. The steam accounts for 50% of the total activation gas, and the semi-finished activation material is obtained.

[0054] C. Preparation of high modulus sodiu...

Embodiment 3

[0062] A new process for the joint production of high-quality rice husk-based activated carbon and wet-process sodium silicate, comprising the following steps:

[0063] A. Rice husk pretreatment:

[0064] The rice husk raw material is screened to remove impurities, such as large specific gravity sand, bricks, metal pieces and other impurities.

[0065] B. Preparation of rice husk activation material:

[0066] Reaction principle: C+H 2 O→CO+H 2

[0067] Rice husks with 12% moisture and 15% ash were put into a carbonization furnace, and a reducing gas at 600°C was introduced for carbonization. The reducing gas came from the high-temperature tail gas of the activation section, and the carbonization time was 2 hours. Use flammable gas anoxic combustion to heat the steam to 950°C for activation, the activation time is 4 hours, steam accounts for 60% of the total activation gas, and the semi-finished activation material is obtained.

[0068] C. Preparation of high modulus sodiu...

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Abstract

The invention provides a novel process for co-production of high-quality rice husk-based activated carbon and wet-process sodium silicate. The method is characterized in that reducing gas is adopted to carry out carbonization and activation heat supply on rice husks, water vapor for activation reacts with a carbonized material after being heated at a high temperature, heat absorption consumption of the activation reaction is balanced through heat of the water vapor, and activation can be maintained at the temperature of lower lattice rate of silicon dioxide. According to the method, the lattice conversion rate of silicon dioxide in the material can be reduced, the rice hull activated material with high carbon content is obtained, and polymerization of silicon dioxide is hindered by the carbon content; the silicon dioxide in the activated material is easy to extract, the activated material can be used for preparing the high-modulus sodium silicate through low-temperature normal-pressure gradient extraction, and the total dissolution rate of the silicon dioxide can reach 95% or above; by combining with a quartz sand wet-process sodium silicate process, the problem of low wet-process modulus is solved; and the invention relates to a novel process for simultaneously preparing high-quality activated carbon from rice husks and extracting high-modulus sodium silicate by a wet method.

Description

【Technical field】 [0001] The invention belongs to the technical field of comprehensive utilization of rice husks, and in particular relates to a new process for the joint production of high-quality rice husk-based activated carbon and wet-process sodium silicate. 【Background technique】 [0002] The information disclosed in this Background section is only intended to increase the understanding of the general background of the disclosure, and is not necessarily to be taken as an acknowledgment or any form of suggestion that the information constitutes prior art that is already known to those skilled in the art. [0003] my country is a big rice country, with an annual rice output of more than 200 million tons, accounting for about one-third of the global annual output, ranking first in the world. And rice processing produces about 20% rice husk by weight, and rice husk resources are abundant. The chemical composition of the dry basis of rice husk is about 80% organic matter a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/32C01B32/336C01B32/324
CPCC01B33/32C01B32/336C01B32/324
Inventor 卢元健方世国余梁哥陈卫群欧文周晓兰林祥龙
Owner NANPING YUANLI ACTIVE CARBON CO LTD
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