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Method for sealing carbon dioxide and fixing sand by using underground salt brine

A carbon dioxide, salt brine technology, applied in chemical instruments and methods, applications, inorganic chemistry, etc., can solve the problems of easy to be eroded by wind and sand, difficult to degrade, long repair cycle, etc., to achieve improved treatment effect, strong process operability, The effect of improving the ecological environment

Active Publication Date: 2019-01-29
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Physical sand fixation is mainly to block wind and sand by setting sand barriers, but these mechanical obstacles are easily eroded by wind and sand, and the protection time is short, so they need to be replaced regularly
Chemical sand fixation is mainly by spraying various chemical sand fixation agents to form a consolidation shell with a certain weathering resistance on the sand surface to block the flow of sand; but these chemical sand fixation agents are mainly high molecular polymers, which are expensive and difficult to degrade , it is easy to bring new environmental problems to the repaired area
Bio-sand fixation is mainly achieved by restoring vegetation; however, it is too difficult to plant plants in desert areas, and the restoration period is too long

Method used

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  • Method for sealing carbon dioxide and fixing sand by using underground salt brine
  • Method for sealing carbon dioxide and fixing sand by using underground salt brine
  • Method for sealing carbon dioxide and fixing sand by using underground salt brine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Take the desert sand collected from the desert control area (planted with Cistanche) in Linze County, Gansu Province, and spread it into a sandy field. The XRD diagram of the sand is shown in figure 1 .

[0037] Sand fixation method:

[0038] (1) The subterranean salt brine after concentration (calcium ion concentration is 0.125mol / L) is passed in the mixing reactor with the speed of 100ml / min, and the concentrating method is to adopt the mode of natural drying, utilizes the strong illumination of desert area, does not Increase energy consumption; Pass into the waste gas carbon dioxide (250ml / min speed) that is collected in the waste gas storage tank in the mixed reactor, control the internal pressure of the mixed reactor to be 0.3MPa, stir and mix evenly, the stirring speed is 300rpm, obtains mixed slurry ;

[0039] (2) drop ammonia water to adjust the pH to 7.0, the ammonia water drop rate is 1.5ml / min, and continue to stir evenly;

[0040] (3) The slurry after the...

Embodiment 2

[0043] The desert sand collected from the untreated desert area in Linze County, Gansu Province was paved into a sandy land.

[0044] Sand fixation method:

[0045] (1) The subterranean brine after concentration (calcium ion concentration is 0.125mol / L) is passed in the mixing reactor with the speed of 120ml / min, and the concentrating method is to adopt the mode of natural drying, utilizes the strong illumination of desert area, does not Increase energy consumption; Pass into the waste gas carbon dioxide (the speed of 350ml / min) that is collected in the waste gas storage tank in the mixed reactor, control the internal pressure of the mixed reactor to be 0.3MPa, stir and mix evenly, the stirring rate is 400rpm, obtains mixed slurry ;

[0046] (2) drop ammonia water to adjust the pH to 7.5, the ammonia water drop rate is 2.1ml / min, and continue to stir evenly;

[0047] (3) The slurry after the pH adjustment is discharged from the bottom of the mixing reactor, drip irrigation (dr...

Embodiment 3

[0050] Take the desert sand collected from the Badain Jaran Desert area and pave it into a sandy field. The XRD picture of the sand is shown in Figure 4 .

[0051] Sand fixation method:

[0052] (1) The underground salt brine after concentration (calcium ion concentration is 0.25mol / L) is passed in the mixing reactor with the speed of 90ml / min, and the concentrating method is to adopt the mode of natural drying, utilizes the strong illumination of desert area, does not Increase energy consumption; Pass into the waste gas carbon dioxide (500ml / min speed) that is collected in the waste gas storage tank in the mixed reactor, control the internal pressure of the mixed reactor to be 0.4MPa, stir and mix evenly, the stirring rate is 500rpm, obtains mixed slurry ;

[0053] (2) drop ammonia water to adjust the pH to 7.5, the ammonia water drop rate is 3.0ml / min, and continue to stir evenly;

[0054] (3) The slurry after the pH adjustment is discharged from the bottom of the mixing...

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Abstract

The invention relates to a method for sealing carbon dioxide and fixing sand by using underground salt brine. The method comprises the steps: introducing concentrated underground salt brine into a mixing reactor, then introducing exhaust carbon dioxide gas collected in an exhaust gas storage tank into the mixing reactor, and performing stirring and uniform mixing so as to obtain mixed slurry; andadjusting the pH value of the mixed slurry to 6-9 with ammonia water, then discharging the obtained slurry from the bottom of the mixing reactor, performing drip pouring on the surface layer of sand so as to form a solid formation layer of 1-5 cm thick, drying the residual exhaust gas discharged from the top of the mixing reactor, and performing delivery into the exhaust gas storage tank for recycling use. The underground salt brine resources are fully utilized, carbon dioxide emission reduction and the desertification problem are combined, joint solution and joint treatment are conducted, and no matter with difficult degradation exists in the process, so that the influence of the method on the environment of a storage place is reduced to a maximum extent; and meanwhile, ammonium salt staying on the surface layer of the sand is beneficial to plant growth in the future, and the method has the advantages of energy saving, environmental protection, simple operation and easy implementation.

Description

technical field [0001] The invention relates to a technology for sequestering carbon dioxide and fixing sand by using underground salt brine, which belongs to the technical field of environmental protection. Background technique [0002] In the desert areas of Northwest my country, such as the Qaidam Basin, the Jungar Basin, the Tarim Basin, the Turpan Basin, the Ordos Basin, and the Badain Jaran Desert, there are abundant underground brine resources. The main component of these underground brines is Na + 、K + , Ca 2+ , Mg 2+ , Cl - 、HCO 3 - , SO 4 2- Plasma, mainly calcium-type salt brine, with a pH of 6.5-7.5, cannot be used as domestic and industrial water resources, and usually cannot meet the requirements of mining. Salt brine resources are a huge treasure house of liquid mineral resources, and comprehensive development can produce obvious economic and social benefits. [0003] Currently, CO 2 The main greenhouse gas effect has caused a series of global enviro...

Claims

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Application Information

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IPC IPC(8): C09K17/06C01F11/18C09K105/00
CPCC09K17/06C01F11/181C09K2105/00
Inventor 张猛龙赵良季峻峰
Owner NANJING UNIV