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Method for co-producing X-type zeolite by mineralizing CO2 with blast furnace slag

A blast furnace slag and zeolite technology is applied in the field of using blast furnace slag to mineralize CO2 to co-produce X-type zeolite.

Pending Publication Date: 2021-12-31
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above patents do not consider the simultaneous recovery of Al 2 o 3 and SiO 2

Method used

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  • Method for co-producing X-type zeolite by mineralizing CO2 with blast furnace slag
  • Method for co-producing X-type zeolite by mineralizing CO2 with blast furnace slag
  • Method for co-producing X-type zeolite by mineralizing CO2 with blast furnace slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Evenly mix the blast furnace slag and ammonium sulfate which are finely ground to below 150 μm into the sulfuric acid solution, control the mass ratio of blast furnace slag and ammonium sulfate to 1:2, the concentration of sulfuric acid solution is 10wt%, and the mass ratio of sulfuric acid solution to solid material is 4:1; and the mixed material was magnetically stirred at 25°C for 60 minutes, and filtered to obtain sulfate leachate and hemihydrate gypsum leach residue;

[0026] (2) Slowly add ammonia water to the sulfate leach solution obtained in step 1, adjust the pH value to 6, control the temperature at 30° C., and obtain silica-alumina gel and magnesium sulfate mother liquor after filtering;

[0027] (3) Mix and dissolve aluminum hydroxide and sodium hydroxide in water, add an appropriate amount of sodium silicate, and control the molar ratio of silicon to aluminum to be 1:1 to obtain a directing agent;

[0028] (4) Add the directing agent obtained in step 3...

Embodiment 2

[0031] (1) Evenly mix blast furnace slag and ammonium sulfate finely ground to below 150 μm into sulfuric acid solution, control the mass ratio of blast furnace slag and ammonium sulfate to 1:3, the concentration of sulfuric acid solution is 20wt%, and the mass ratio of sulfuric acid to solid material is 3 : 1; and the mixed material was magnetically stirred at 40° C. for 50 min, filtered to obtain sulfate leachate, and hemihydrate gypsum leach slag;

[0032] (2) Slowly add ammonia water to the sulfate leach solution obtained in step 1, adjust the pH value to 6.5, control the temperature at 45° C., and obtain silica-alumina gel and magnesium sulfate mother liquor after filtering;

[0033] (3) Mix and dissolve aluminum hydroxide and sodium hydroxide in water, add an appropriate amount of sodium silicate, and control the molar ratio of silicon to aluminum to 2:1 to obtain a directing agent;

[0034] (4) Add the directing agent obtained in step 3 to the silica-alumina gel obtaine...

Embodiment 3

[0037] (1) Evenly mix blast furnace slag and ammonium sulfate finely ground to below 150 μm into sulfuric acid solution, control the mass ratio of blast furnace slag and ammonium sulfate to 1:4, the concentration of sulfuric acid solution is 30wt%, and the mass ratio of sulfuric acid to solid material is 1 : 1; and the mixed material was magnetically stirred at 55° C. for 35 min, filtered to obtain sulfate leachate, and hemihydrate gypsum leach slag;

[0038] (2) Slowly add ammonia water to the sulfate leach solution obtained in step 1, adjust the pH value to 7, control the temperature at 65° C., and obtain silica-alumina gel and magnesium sulfate mother liquor after filtering;

[0039] (3) Aluminum hydroxide and sodium hydroxide are mixed and dissolved in water, an appropriate amount of sodium silicate is added, and the silicon-aluminum molar ratio is controlled to be 3:1 to obtain a directing agent;

[0040] (4) Add the directing agent obtained in step 3 to the silica-alumin...

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Abstract

The invention discloses a method for co-producing X-type zeolite by mineralizing CO2 with blast furnace slag, which comprises the following steps: (1) mixing blast furnace slag and ammonium sulfate, and conducting leaching with a sulfuric acid solution to obtain a sulfate leaching solution and semi-hydrated gypsum leaching slag; (2) adding ammonia water into the leachate obtained in the first step, adjusting the pH value, precipitating silicon and aluminum to form silica-alumina gel, and conducting filtering to obtain silica-alumina gel and magnesium sulfate mother liquor; (3) dissolving aluminum hydroxide, sodium hydroxide and sodium silicate in water according to a certain proportion, and fully conducting stirring to obtain white sol (guiding agent) for later use; (4) adding a proper amount of a guiding agent into the silica-alumina gel obtained in the step (2), fully conducting mixing with sodium hydroxide, putting the mixture into a reaction kettle, carrying out hydrothermal reaction for a period of time, and washing a solid product with deionized water to obtain X-type zeolite; and (5) adding ammonia water into the semi-hydrated gypsum leaching residues obtained in the first step and the second step and the magnesium sulfate mother liquor, introducing CO2 to generate calcium carbonate and magnesium carbonate trihydrate respectively, so as to achieve CO2 mineralization.

Description

Technical field [0001] This invention belongs to CO 2 In the field of emission reduction and solid waste resource utilization, it mainly involves a method of using blast furnace slag to mineralize CO 2 Method for co-producing X-type zeolite. Background technique [0002] Increased energy demand and excessive use of fossil fuels have resulted in large amounts of carbon dioxide (CO 2 ) emissions, global warming. According to data from the U.S. Global Monitoring Laboratory, the current CO in the atmosphere 2 The concentration (June 2021) has reached 419ppm, with an annual growth rate of 2.3ppm. At present, due to the low proportion of new energy in the current energy structure, carbon dioxide mineralization and storage is regarded as the most promising carbon dioxide emission reduction strategy. Among them, CO 2 Reacts with Ca / Mg-containing ores or solid waste to form stable carbonates (CaCO 3 / MgCO 3 ) form and permanent storage. Blast furnace slag is one of the solid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/55C01B33/26C01B39/22C01F5/24C01F11/18
CPCC01B32/55C01F5/24C01F11/182C01B33/28C01B39/22C01P2002/72C01P2004/03
Inventor 杨臣刘维燥吴泓利曹俊刘清才
Owner CHONGQING UNIV
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