CN-122014336-A - Multi-stage mixed type carbon negative filling system and method for filling material

CN122014336ACN 122014336 ACN122014336 ACN 122014336ACN-122014336-A

Abstract

The invention relates to a filling material multistage mixing type carbon negative filling system and method, wherein the system comprises a ground batching module, a conveying pipeline, a first mixing module, a second mixing module and a control module, wherein the ground batching module is used for mixing aggregate with water to prepare low-concentration slurry, the conveying pipeline is used for conveying the filling material, the first mixing module is used for injecting cementing materials into the low-concentration slurry, the second mixing module is located at the downstream of the first mixing module and used for injecting water-retaining agents and carbon dioxide into the slurry after the cementing materials are injected, the former is used for pasting the slurry, the latter reacts in the slurry, the control module is in communication connection with other modules and used for controlling material injection timing and injection quantity, the second mixing module is arranged at the rear section of the conveying pipeline, and the first mixing module is arranged at the upstream of the second mixing module and close to the second mixing module. The intelligent sectional regulation and control capability of the system enables the filling process to be dynamically adapted to complex pipeline working conditions, and the utilization efficiency of the cementing material and the carbon dioxide is optimized while the safety of conveying is ensured.

Inventors

WANG DEFENG
SONG XINTAO
WU AIXIANG
WANG YIMING
DU ZHAOLONG
Shu Shuairan
ZHANG KEN

Assignees

北京科技大学

Dates

Publication Date: 20260512
Application Date: 20260122

Claims (10)

1. A filler material multi-stage hybrid carbon negative filling system, the system comprising: the ground batching module is used for mixing aggregate with water to prepare low-concentration slurry; the inlet end of the conveying pipeline is connected with the ground batching module, and the outlet end of the conveying pipeline is communicated with the underground goaf and is used for conveying filling materials; the first mixing module is arranged on the conveying pipeline and is used for injecting a cementing material into the low-concentration slurry; A second mixing module arranged on the conveying pipeline and positioned at the downstream of the first mixing module and used for injecting water-retaining agent and carbon dioxide into the slurry injected with the cementing material, wherein the injection of the water-retaining agent is used for pasting the slurry, the injection of the carbon dioxide is used for carrying out in-situ carbonization reaction in the slurry so as to realize carbon sealing, and The control module is in communication connection with the ground batching module, the first mixing module and the second mixing module and is used for controlling the material injection time and the injection quantity; The second mixing module is arranged at the rear section of the conveying pipeline so as to ensure that the water-retaining agent and the carbon dioxide are fully mixed and form a paste structure before the slurry reaches the goaf, and the first mixing module is arranged at the upstream of the second mixing module and is close to the second mixing module.
2. The fill material multi-stage hybrid carbon negative fill system of claim 1, wherein the floor batching module comprises: a first feeding unit for storing and feeding the aggregate, which comprises a first storage bin for storing tailings or crushed stone aggregate and a conveying device; a water supply unit for supplying the water; The first stirring unit is connected with the first feeding unit and the water supply unit and is used for stirring and mixing aggregate from the first feeding unit and water from the water supply unit to prepare the low-concentration slurry with the concentration of 20% -30%, and the first stirring unit is used for stirring and mixing aggregate from the first feeding unit and water from the water supply unit to prepare the low-concentration slurry with the concentration of 20% -30% And the slurry pump is connected with the first stirring unit and the inlet end of the conveying pipeline and is used for pumping the low-concentration slurry into the conveying pipeline.
3. The filling material multi-stage mixing-in type carbon negative filling system according to claim 1, wherein the first mixing module comprises at least two cementing material injection stations sequentially arranged along the conveying pipeline, and the cementing material injection stations are used for injecting the cementing material into the low-concentration slurry in batches so as to increase the concentration of the slurry to 70% -80% after the slurry flows through the first mixing module; each of the cement injection stations includes: The second feeding unit is used for storing and feeding the cementing material and comprises a second storage bin and a first metering pump; a first injection interface connecting the second supply unit and the delivery conduit for introducing cementitious material into the slurry within the delivery conduit, and And the second stirring unit is arranged on the pipe section at the downstream of the first injection interface and is used for promoting the mixing of the cementing material and the slurry.
4. The multi-stage hybrid carbon negative filling system according to claim 3, wherein the number of the cement injection stations is two, and the cement addition amount of the first cement injection station is smaller than the cement addition amount of the second cement injection station in the conveying direction.
5. The filling material multi-stage mixing-in type carbon negative filling system according to claim 1, wherein the second mixing module comprises at least two co-injection stations sequentially arranged along the conveying pipeline for injecting water-retaining agent and carbon dioxide into the slurry after the cementing material has been injected in batches; Each of the co-injection stations comprises: the third feeding unit is used for storing and feeding the water-retaining agent and comprises a water-retaining agent storage tank and a second metering pump; A fourth feeding unit for storing and feeding carbon dioxide, which comprises a carbon dioxide storage tank and a third metering pump; a second injection port for introducing water-retaining agent and carbon dioxide into the delivery conduit, and And the third stirring unit is arranged at the downstream of the second injection interface.
6. The multi-stage hybrid carbon negative filling system according to claim 5, wherein the number of the co-injection stations is two, and the water-retaining agent and carbon dioxide added in the first co-injection station are larger than the water-retaining agent and carbon dioxide added in the second co-injection station in the conveying direction.
7. The filling material multi-stage mixing-in type carbon negative filling system according to claim 1, wherein a sensor is provided on the conveying pipe; The control module is communicatively coupled to the sensor and configured to: and dynamically adjusting the material injection time and the injection quantity of the first mixing module and/or the second mixing module according to the pipeline along-distance pressure, the flow or the slurry concentration signal acquired by the sensor.
8. The fill material multi-stage hybrid carbon negative fill system of claim 1, further comprising a terminal forming module disposed at an outlet end of the delivery conduit; The terminal forming module comprises: an end mixer for final stirring of the paste from the delivery pipe, and And the discharging opening is connected with the downstream of the end mixer and is used for discharging the stirred paste to the goaf.
9. A method for multi-stage mixing in of a filler material to form a negative carbon charge, the method comprising: mixing aggregate with water on the ground to prepare low-concentration slurry; Pumping the low-concentration slurry into a conveying pipeline for conveying; Injecting a cementing material into the low-concentration slurry at a first position of the conveying pipeline; Injecting water-retaining agent and carbon dioxide into the slurry injected with the cementing material at a second position of the conveying pipeline downstream of the first position, wherein the injection of the water-retaining agent is used for pasting the slurry, and the injection of the carbon dioxide is used for carrying out in-situ carbonization reaction in the slurry so as to realize carbon sequestration; The injection time and the injection amount of the cementing material, the water-retaining agent and the carbon dioxide are regulated and controlled by a control module, the second position is positioned at the rear section of the conveying pipeline so as to ensure that the water-retaining agent and the carbon dioxide are fully mixed and form a paste structure before the slurry reaches the goaf, and the first position is close to the second position.
10. The multi-stage mixed-in type carbon negative filling method of the filling material according to claim 9, wherein the concentration of the low-concentration slurry is 20% -30%, the concentration of the slurry injected with the cementing material is 70% -80%, the volume ratio of the water retaining agent to the water is 1 (700-1000), and the volume ratio of the carbon dioxide to the water at normal temperature and normal pressure is 0.6-1:1.

Description

Multi-stage mixed type carbon negative filling system and method for filling material Technical Field The invention relates to the technical field of mine filling, in particular to a filling material multi-stage mixing-in type carbon-negative filling system and method. Background Along with the continuous increase of underground mining depth and scale, the filling mining method is widely applied in the fields of metal ores, nonmetallic ores and the like because the ground pressure can be controlled, the ground surface subsidence can be reduced, and the resource recovery rate can be improved. Filling materials are usually prepared by using solid wastes such as tailings, waste stones and the like in filling mining, and are conveyed to a goaf through a pipeline, so that the filling materials can obtain bearing capacity and overall stability within a certain time. The filling process commonly used in engineering comprises water sand filling, high-concentration cement tailing filling, cementing filling, paste filling, high-water material filling and the like. The existing mine filling adopts a pipeline conveying system with single-point preparation on the ground and single-stage stirring. The basic structure of the device comprises a ground raw material bin, a metering device, a stirrer (or a stirring tank), a slurry tank, a conveying pump and a long-distance pipeline, and is sometimes provided with an additive feeding device such as a water reducing agent. The working principle is that the tailings (or aggregate), the cementing material and the water are mixed into filling slurry with target concentration on the ground at one time, and then the slurry is integrally conveyed to the underground goaf for molding through a pipeline. The existing filling process has the common problems that firstly, high-concentration and high-viscosity slurry has high resistance in a pipe and high pumping pressure when being conveyed for a long distance, the pipe is easily blocked at an elbow and a high-level section, the energy consumption and the maintenance cost are increased, secondly, if the concentration is reduced for ensuring the conveying safety, the bleeding after filling of a goaf is large, the segregation is obvious, a good structure and enough early strength are difficult to form, and thirdly, the filling cost and the carbon emission level are high because higher cement consumption is generally required for obtaining the target strength. Disclosure of Invention In order to solve the technical problems that a pipe is easy to block in long-distance conveying and the filling quality and the carbon negative effect of a terminal are difficult to cooperatively promote in the prior art, the embodiment of the invention provides a filling material multi-stage mixing type carbon negative filling system and a filling material multi-stage mixing type carbon negative filling method. The technical scheme is as follows: In one aspect, a multi-stage mixing type carbon negative filling system for filling materials is provided, the system comprises a ground batching module, a conveying pipeline, a first mixing module, a second mixing module and a control module, wherein the ground batching module is used for mixing aggregate with water to prepare low-concentration slurry, the inlet end of the conveying pipeline is connected with the ground batching module, the outlet end of the conveying pipeline is communicated with a downhole goaf and is used for conveying the filling materials, the first mixing module is arranged on the conveying pipeline and is used for injecting cementing materials into the low-concentration slurry, the second mixing module is arranged on the conveying pipeline and is positioned at the downstream of the first mixing module and is used for injecting water-retaining agent and carbon dioxide into the slurry after the cementing materials are injected, the injection of the carbon dioxide is used for enabling in-situ carbonization reaction to occur in the slurry to achieve carbon sealing, the control module is in communication connection with the ground batching module, the first mixing module and the second mixing module and is used for controlling material injection time and injection quantity, the second mixing module is arranged at the rear section of the conveying pipeline and is used for ensuring that the water-retaining agent and the carbon dioxide reach the first mixing module and is fully arranged on the goaf the first mixing module. On the other hand, the method comprises the steps of mixing aggregate with water on the ground to prepare low-concentration slurry, pumping the low-concentration slurry into a conveying pipeline for conveying, injecting a cementing material into the low-concentration slurry at a first position of the conveying pipeline, injecting a water-retaining agent and carbon dioxide into the slurry injected with the cementing material at a second position of the conveying pipeline downstream o