Method for preparing lithium silicate material for absorbing CO2 at high temperature

A technology for absorbing material, lithium silicate, applied in separation methods, chemical instruments and methods, silicon compounds, etc., can solve the problems of low degree of development and utilization, complex preparation process, high cost of raw materials, environmental protection and low preparation cost , the effect of reducing CO2 emissions

Inactive Publication Date: 2010-02-24
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the preparation of lithium silicate materials are processed SiO 2 Raw materials and Li 2 CO 3 It is obtained by mixing high-temperature solid-phase method, the cost of raw materials is high, and the preparation process is relatively complicated. At present, my country's diatomite mineral resources are abundant, and the degree of development and utilization is not high.
[0006] So far, no cheap natural mineral diatomaceous earth has been used as a raw material to prepare high-temperature CO 2 Reports on invention patents and research literature of the absorbent lithium silicate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0022] First, put diatomaceous earth into a muffle furnace for pre-calcination for 2 hours at a temperature of 250° C. to remove moisture and silicon shells in the diatomite. Then, the lithium carbonate powder with a molar ratio of 2.1 and the pretreated diatomaceous earth were evenly mixed, ground with water, and dried. Lithium silicate powder obtained by roasting lithium carbonate and diatomaceous earth in a muffle furnace for 4 hours at 700°C. The prepared lithium silicate powder was placed in a thermogravimetric analyzer under CO 2 :N 2 =1 (molar ratio) in an atmosphere with a temperature increase rate of 10K / min from 40°C to 620°C (absorption temperature), and keep the temperature for 45min for CO 2 absorption reaction to obtain CO 2 The absorption capacity is 15.8%.

example 2

[0024] First, put the diatomite in a muffle furnace for pre-calcination for 2.5 hours at a temperature of 300° C. to remove moisture and silicon shells in the diatomite. Then, the lithium carbonate powder with a molar ratio of 2.6 and the pretreated diatomaceous earth were evenly mixed, ground with water, and dried. Lithium silicate powder obtained by calcining lithium carbonate and diatomaceous earth in a muffle furnace for 3 hours at 600°C. The prepared lithium silicate powder was placed in a thermogravimetric analyzer under CO 2 :N 2 =1 (molar ratio) in an atmosphere with a temperature increase rate of 10K / min from 40°C to 620°C (absorption temperature), and keep the temperature for 45min for CO 2 absorption reaction to obtain CO 2 The absorption capacity is 30.32%.

example 3

[0026] First, put the diatomite in a muffle furnace for pre-calcination for 2 hours at a temperature of 450° C. to remove moisture and silicon shells in the diatomite. Then, the lithium carbonate powder with a molar ratio of 2.1 and the pretreated diatomaceous earth were evenly mixed, ground with water, and dried. Lithium silicate powder obtained by roasting lithium carbonate and diatomaceous earth in a muffle furnace for 2 hours at 850°C. The prepared lithium silicate powder was placed in a thermogravimetric analyzer under CO 2 :N 2 =1 (molar ratio) in an atmosphere with a temperature increase rate of 10K / min from 40°C to 620°C (absorption temperature), and keep the temperature for 45min for CO 2 absorption reaction to obtain CO 2 The absorption capacity is 28.78%.

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Abstract

The invention relates to a method for preparing a material absorbing CO2 at a high temperature, in particular to a method for preparing a lithium silicate material which uses infusorial earth as a rawmaterial and absorbs CO2 at a high temperature. The method comprises the following steps: mixing the lithium silicate and the infusorial earth according to the stoichiometric coefficient of reaction,the mixture is heated, roasted and synthesized in a reacting furnace at the temperature from 600 DEG C to 900 DEG C, and obtaining the absorbing material of the lithium silicate after the reaction. The invention recovers carbon resources and reduces the discharge of CO2 aiming at the problem that a lot of CO2 at high temperature is discharged from stack gas in an electric power plant. The methoduses the infusorial earth which is a low-cost natural mineral material and LiCO3 as the raw material and adopts a high-temperature solidoid method to synthesize the lithium silicate material. Comparedwith the prior art, the infusorial earth used as the raw material has low cost and accessibility. The invention adopts simple preparation technology and easy to realize industrialized production.

Description

technical field [0001] The present invention relates to the preparation of high temperature CO 2 A method for absorbing materials, especially a diatomaceous earth-based high-temperature CO 2 The preparation method of the absorption material lithium silicate. Background technique [0002] Diatomaceous earth is a kind of biogenic siliceous sedimentary rock, which is mainly composed of the remains of ancient diatoms, of which it is mainly composed of 80% to 90%, some even more than 90% of diatom frustule, the main chemical composition is SiO 2 , and a small amount of Al 2 o 3 , Fe 2 o 3 , CaO, MgO, etc. Because diatomite has the characteristics of fineness, looseness, light weight, porosity, water absorption and strong permeability, it can remove solid particles, suspended particles, colloidal particles and bacteria in the liquid, and play a role in filtering and purifying the liquid. It is widely used In food, medicine and other industries. Generally speaking, in the t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/10B01J20/30B01D53/02B01D53/81B01D53/62C01B31/20C01B32/50
CPCY02P20/151
Inventor 陕绍云贾庆明王亚明
Owner KUNMING UNIV OF SCI & TECH
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