Mineral resources are one of the basic industries of the country and enable the progress and development of human society. It can be said that human progress is measured by the ability to utilize minerals. However, mining activities also face a series of environmental issues such as surface subsidence, building damage, solid waste discharge, and aquifer damage. Taking the development of coal resources as an example, according to statistics, the average subsidence area caused by mining ten thousand tons of coal is about 3.6 mu, and the annual output of coal gangue reaches over 600 million tons, accounting for about 18.3% of the national bulk solid waste.
With the progress of technology and the development of civilization, the construction of ecological green mines requires that tailings, waste rocks, coal gangue, fly ash, and smelting slag generated during mine development be treated and filled to the maximum extent, to protect the surface from collapse, to achieve low or zero emissions of solids during mining, and to protect the environment, while promoting the development of mines towards ecological mining, circular economy, and sustainable development. Therefore, the construction of green mines cannot be separated from solid backfill grouting, and grouting cannot be separated from grouting pumps. The new overburden separation grouting technology utilizes the separation space formed in the overlying strata after coal mining, and uses a pressure pump to inject coal gangue powder, fly ash, cement, or mixture slurry into the separation layer below the key layer through a grouting pipe. After the slurry is precipitated, the water is removed and retained, forming a saturated pressure solid, thereby supporting the upper key layer, forming a bearing body of "separation zone filling body (compaction zone)+coal pillar+key layer", Ensure that the upper rock layer and ground do not suffer damage and deformation.
The new overburden separation grouting technology meets the requirements of high pressure, large flow, high efficiency, and low cost grouting, ensuring the subsidence reduction effect in the goaf. At the same time, it is the first time to propose a harmless and large-scale disposal plan for solid waste using separation space and related goaf spaces. In overlying rock separation layer grouting, a pressure pump with large flow rate and stepless speed change is required. The following describes several commonly used pressure pumps. F-300 Mud Pump F-500 Mud Pump F-1000 Mud Pump
The above pumps are suitable for various corrosive, non viscous and non viscous liquid grouting projects, especially for vertical shaft face grouting, coal mine floor grouting, goaf filling, mine water inrush treatment, and other aspects. The main reasons are summarized as follows:
1. The product structure is reasonable, and many products are produced according to the International Petroleum Association API 7K standard;
2. When the grouting concentration can reach 75%, the pump flow rate used is large, and the single separation layer high-pressure grouting is used, with upper support and lower pressure to eliminate residual deformation and achieve space conservation;
3. Frequency conversion control system can be used to achieve stepless speed change, achieve adjustment of different flow rates and pressures, and meet the requirements for grouting in different formations;
4. The above mud pumps or grouting pumps are sturdy and durable, and can be used for a long time without interruption for 24 hours;
5. The vulnerable parts of the product are highly versatile, and the vulnerable parts of the mud pump that implement the API 7K standard are universal worldwide;
6. All adopt the advantages of alloy forged pump heads, herringbone gears, and various gear and bearing lubrication methods to promote the service life of the equipment;
7. Frequency conversion control, saving energy consumption, low comprehensive operating costs, and other advantages.