Office Action 2: Notice of Allowance (2025-05-29)

CLAIMS:
Amendments to the Claims:

This listing of the claims will replace all prior versions of the claims in the application:

Application No.: 18/364,733

1\. (Currently Amended) A method for backfilling and reconstructing a carbon storage space in an abandoned main roadway and storing CO2, comprising following steps of:
step 1, surveying a surrounding rock of the main roadway, and analyzing a a density of the surrounding rock of fractures and cavities inside the main roadway;
step 2, reinforcing and supporting the surrounding rock of the fractures and cavities by anchor bolts or anchor cables, so as to ensure a stable operation of the main roadway;
step 3, customizing a support formwork according to a width and a height of a roadway section of the main roadway, wherein the support formwork is spaced apart a distance of 50 cm to 80 cm from a top, two sides and a floor of the main roadway;
step 4, constructing a first backfilling wall at a first end of the main roadway, wherein a thickness of the first backfilling wall is of 50 cm to 60 cm to ensure that the first end of the roadway is completely sealed without air leakage;
step 5, placing the support formwork made in step 3 inside the main roadway, splicing the support formwork according to a shape of the main roadway, attaching the support formwork closely to the first backfilling wall, and temporarily fixing the spliced support formwork by the anchor bolts and the anchor cables;
step 6, injecting backfilling slurry into a gap between the support formwork and the main roadway through a backfilling pipeline to form a backfilling thickness of 50 cm to 80 cm around the main roadway; injecting supercritical carbon dioxide into the

Application No.: 18/364,733 backfilling slurry between the support formwork and the main roadway, and enabling the supercritical carbon dioxide to fully react with the backfilling slurry for 3 h to 5 h to solidify the backfilling slurry to reach a support strength of 1 MPa to 2 MPa, and then stopping injecting the supercritical carbon dioxide;
step 7, dismantling the support formwork and constructing a second backfilling wall at an interval of 30 m to 40 m from the first backfilling wall, after the backfilling slurry fully reacts with the supercritical carbon dioxide and solidifies;
step 8, injecting the supercritical carbon dioxide into an enclosed space between the first backfilling wall and the second backfilling wall through a gas injection hole reserved on the second backfilling wall, and stopping injecting the supercritical carbon dioxide when an injection pressure of the supercritical carbon dioxide is from 1 MPa to 1.5 MPa and a CO2 concentration in the enclosed space between the first backfilling wall and second backfilling wall reaches 5,000 ppm and more, and then sealing the reserved gas injection hole reserved on the second backfilling wall;
step 9, constructing the support formwork on a side which is opposite to the first backfilling wall, of the second backfilling wall, continuing to form an other enclosed space by constructing the support formwork, repeating step 5 to step 8, injecting the backfilling slurry and the supercritical carbon dioxide to the other enclosed space outside of the support formwork, and injecting the supercritical carbon dioxide into an enclosed space between the second backfilling wall and a third backfilling wall;
and step 10, when the carbon storage space of the main roadway is backfilled and sealed to the second end of the main roadway, constructing a final backfilling wall at the second end of the roadway to enclose the roadway space, injecting the supercritical oxide dioxide into the carbon storage space, and sealing the carbon storage space.

Application No.: 18/364,733

2\. (Canceled)

3\. (Canceled)

4\. (Currently Amended) The method for backfilling and reconstructing a carbon storage space in an abandoned main roadway and storing CO2 according to claim 3, wherein the anchor bolts that reinforce and support the damaged portion of the surrounding rock in step 2 are resin rock bolts , and the resin rock bolts each have a specification of tp22 mmx2,400 mm, a designed anchoring force of greater than or equal to 190 kN/bolt and a row spacing of 600 mmx600 mm, and the anchor cables that reinforce and support the damaged portion of the surrounding rock in step 2 are anchor cables each having a specification of qp 22 mmx8,000 mm, a designed anchoring force of greater than or equal to 240 kN/bolt, and a row spacing of 1,500 mmx1,800 mm are respectively used.

5\. (Original) The method for backfilling and reconstructing a carbon storage space in an abandoned main roadway and storing CO2 according to claim 1, wherein step 3 further comprises: forging the support formwork in advance according to the width and the height of the roadway section of the main roadway, and forming the support formwork by splicing steel plates and connecting buckles; wherein the support formwork comprises an arched upper part and a square lower part; and a length of the support formwork in the main roadway is from 30 m to 40 m.

6\. (Original) The method for backfilling and reconstructing a carbon storage space in an abandoned main roadway and storing CO2 according to claim 1, wherein in step 6, the backfilling slurry is prepared from water, cement, caustic sludge, sand and admixture in proportion; a ratio of the caustic sludge to the sand is 5: 2 to 5: 4,

Application No.: 18/364,733 the cement is added with a mass of 10%-20% of the mass of three solid raw materials which comprise the caustic sludge, the sand and the cement, and the admixture is a compound activator prepared from CaO and CaSO4 in a ratio of 1: 1 and has a mass of 1%-1.5% of a total mass of the three solid raw materials, and the backfilling slurry with a mass concentration of 74%-80% is prepared by adding water into the admixture, the caustic sludge, the sand and the cement.

7\. (Original) The method for backfilling and reconstructing a carbon storage space in an abandoned main roadway and storing CO2 according to claim 6, wherein the caustic sludge is waste residue with calcium salts of CaCO3, CaSO4 and CaCl2, wherein CaCO3 accounts for 40%-70% of a total mass of the caustic sludge, and the prepared backfilling slurry is alkaline, with a pH value of 9-11; the supercritical carbon dioxide fully reacts with CaCO3 after injection to absorb a large amount of carbon dioxide, so as to achieve the purpose of chemical storage for the carbon dioxide.

8\. (Original) The method for backfilling and reconstructing a carbon storage space in an abandoned main roadway and storing CO2 according to claim 1, further comprising: converting the supercritical carbon dioxide by a carbon dioxide collector and a carbon dioxide converter on an earth surface, and pumping to the main roadway through a connecting pipeline.

OFFICE ACTION:
DETAILED ACTION
The amendment filed 05/14/2025 has been entered.
Notice of Pre-AIA  or AIA  Status
The present application, filed on or after March 16, 2013, is being examined under the first inventor to file provisions of the AIA .
EXAMINER'S AMENDMENT
An examiner’s amendment to the record appears below. Should the changes and/or additions be unacceptable to applicant, an amendment may be filed as provided by 37 CFR 1.312. To ensure consideration of such an amendment, it MUST be submitted no later than the payment of the issue fee.
The application has been amended as follows to address pendency:
In claim 4, line 2, “claim 3” has been replaced with --claim 1--.
Allowable Subject Matter
Claims 1 and 4-8 are allowed.
The following is an examiner’s statement of reasons for allowance: see reasons for indication of allowable subject matter in the office action dated 03/20/2025.
Any comments considered necessary by applicant must be submitted no later than the payment of the issue fee and, to avoid processing delays, should preferably accompany the issue fee.  Such submissions should be clearly labeled “Comments on Statement of Reasons for Allowance.”
Conclusion

APPLICANT REBUTTAL: REMARKS/ARGUMENTS
After the foregoing Amendment, claims 1 and 4-8 are currently pending in this application. Claims 2-3 are canceled without prejudice. Claims 1 and 4 are amended.
Claim Re
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ections -
35 U.S.C.
X
Claims 1-8 are rejected under 35 U.S.C. §112(b) or 35 U.S.C. §112 (pre-AIA), second paragraph, as being indefinite for specific issues regarding claims 1-4.
Claims 1 and 4 are amended to address the stated issues. Claims 2 and 3 are cancelled without prejudice thereby rendering the issues with respect to those claims as moot. Accordingly. withdrawal of the rejection is respectfully requested.
Allowable Sub
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ect Matter
Applicant thanks the Examiner for indicating that claims 1-8 contain allowable subject matter. It is respectfully submitted that the foregoing amendments which address Section 112 issues place the pending claims in proper form for allowance.
Conclusion