Technique of mineral carbonation CO2 fixing joint produced carbonate products

A mineral carbonation, carbonate technology, applied in the preparation of carbonate/acid carbonate, chemical instruments and methods, dispersion particle separation, etc., can solve difficult large-scale industrial applications, acid medium regeneration difficulties, High economic cost and other issues, to achieve the effect of improving calcium conversion rate, good industrial application prospects, and good economic benefits

Inactive Publication Date: 2008-03-05
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0012] The purpose of the present invention is to overcome existing CO 2 Mineral carbonation fixation process, especially the problems of low calcium conversion rate, difficult acid medium regeneration, high energy consumption, hi

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  • Technique of mineral carbonation CO2 fixing joint produced carbonate products

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Embodiment 1

[0046] The calcium-containing solid waste in this embodiment is selected from iron and steel slag, and the main components in the iron and steel slag are: ~ 45% CaO, ~ 10% MgO, ~ 20% SiO 2 , ~20% FeO, and ~5% other impurities, the specific process is as follows:

[0047] 1) The steel slag is mechanically crushed and sieved to a particle size of 50 meshes to obtain steel slag particles;

[0048] 2) Get 40 grams of steel slag particles obtained in step 1), put them into a 250ml three-hole flask, then add 160ml of deionized water, put the above-mentioned three-hole flask into a magnetically stirred 60°C water bath, and place a straight Finally, slowly add 40ml of glacial acetic acid into the above-mentioned three-hole flask as the leaching medium to start the leaching reaction. The reaction is maintained for 60 minutes. After stopping the water bath, filter to obtain the calcium ion leaching solution. After measurement, the pH of the calcium ion leaching solution is obtained. =3...

Embodiment 2

[0060] The calcium-containing solid waste in this embodiment is selected from iron and steel slag, and the main components in the iron and steel slag are: ~45% CaO, ~10% MgO, ~20% SiO2, ~20% FeO, and ~5% other impurities, specifically The process is as follows:

[0061] 1) The steel slag is mechanically crushed and sieved to a particle size of 100 mesh to obtain steel slag particles;

[0062] 2) Get 40 grams of steel slag particles obtained in step 1), put them into a 250ml three-hole flask, then add 160ml of deionized water, put the above-mentioned three-hole flask into a magnetically stirred 80°C water bath, and place a straight Finally, slowly add 20ml of analytically pure lactic acid into the above-mentioned three-hole flask as the leaching medium to start the leaching reaction. The reaction is maintained for 120 minutes. After stopping the water bath, filter to obtain the calcium ion leaching solution. After measurement, the concentration of the calcium ion leaching solut...

Embodiment 3

[0072] Calcium-containing solid waste in this embodiment is selected from calcium carbide slag, the content of main components in the calcium carbide slag is: ~65% CaO, and ~35% other impurities. The specific process is as follows:

[0073] 1) Carbide slag is mechanically crushed and sieved to a particle size of 150 mesh to obtain carbide slag particles;

[0074] 2) Take 40 grams of calcium carbide slag particles obtained in step 1), put them into a 250ml three-hole flask, then add 160ml of deionized water, put the above-mentioned three-hole flask into a magnetically stirred 80°C water bath, and place a straight Finally, slowly add 80ml analytically pure propionic acid into the above-mentioned three-hole flask as a leaching medium, start the leaching reaction, keep the reaction for 30 minutes, stop the water bath and filter to obtain the calcium ion leaching solution. After measurement, the calcium ion leaching solution is obtained. PH=3-5;

[0075] 3) Place the above-mentioned...

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Abstract

The process of carbonating mineral, fixing CO2 and co-producing carbonate product includes the following steps: crushing calcium-containing solid waste and/or silicate ore to obtain solid particle, adding acid medium, stirring at 60-80 deg.c for 30-120 min, cooling, filtering to obtain calcium ion leaching solution, adding calcium-containing alkaline matter to regulate pH value to 7-8 and filtering to obtain calcium-containing material liquid; adding organic solvent to the calcium-containing material liquid via stirring and introducing CO2 to produce carbonating reaction; filtering the resultant liquid to obtain filtrate and solid matter; washing the solid matter with deionized water and drying to obtain calcium carbonate. The present invention can utilize solid waste and greenhouse gas CO2 resource to produce light calcium carbonate in low production cost and high economic benefit.

Description

technical field [0001] The invention belongs to waste resource utilization, greenhouse gas CO 2 The technical field of emission reduction and resource utilization, especially a method of using calcium-containing solid waste or ore as raw material to fix CO through mineral carbonation 2 Process for the co-production of carbonate products. Background technique [0002] With the consumption of a large amount of fossil energy, atmospheric CO 2 content is increasing year by year, from the greenhouse gas CO 2 The greenhouse effect caused by it is also intensified. The international scientific and technological community is actively developing clean energy to achieve CO 2 emission reduction at the source; at the same time, CO 2 Technology development and industrial trials for large-scale capture, storage and immobilization. [0003] Mineral carbonation fixes CO 2 An important way for large-scale storage and fixation. Mineral carbonation fixation mimics the natural CO 2 The...

Claims

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Application Information

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IPC IPC(8): B01D53/62C01B31/24C01B32/60
Inventor 包炜军李会泉张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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