4results about How to "Solve land occupation" patented technology

The invention relates to the technical field of coal mining, in particular to a coal mining earth surface subsidence reduction treatment method which comprises the steps that an air return way, a connection way and a cut hole which are sequentially communicated are excavated in a continuous mining and continuous filling area; filling mining is divided into two stages, the first filling mining stage comprises the steps that a continuous miner is used for mining a roadway zone, the roadway zone is a goaf roadway after being mined, then the continuous miner is used for mining a roadway zone spaced from the previous goaf roadway, and the previous mined roadway zone is filled while mining is conducted; the second filling and mining stage comprises the step of mining the second roadway zone on the basis of the first filling and mining stage, and the mining is performed in sequence in a spaced and alternate mining and filling manner; the purpose of collaborative operation of filling and coal mining processes can be achieved, the coal gangue is used for filling the roadway belt, the effect of supporting the roadway belt can be achieved, the problem of land occupation of the coal gangue in coal mining is solved, and the settlement reducing effect is remarkable.

This invention relates to the field of zeolite molecular sieve production technology, specifically a method for in-situ crystallization synthesis of zeolite molecular sieves from solid waste coal gangue. The steps are as follows: Coal gangue is calcined at 600-800℃ for 1-5 hours to obtain calcined coal gangue; it is mixed with acid and water at a ratio of 1:(0.1-0.5):(4-8), reacted at 65-95℃ for 1-5 hours, and the pH is adjusted to 7-10 with alkali. After aging, it is filtered, washed, and dried to obtain activated coal gangue; the activated coal gangue is mixed with externally sourced materials, template agent, solid seed crystals (crystallinity ≥85%), and water in a specific ratio, crystallized at 100-200℃ for 24-72 hours, and calcined to obtain SAPO-34, SSZ-13, or AlPO. 4 -5. Adding ammonium salts via ion exchange can produce MTO catalysts. This invention improves the crystallinity of molecular sieves, resulting in a methanol conversion rate of ≥96% for the MTO catalyst, enabling the resource utilization of coal gangue, reducing costs, and providing a versatile process suitable for industrial application.

This invention belongs to the field of industrial solid waste resource utilization and inorganic material preparation technology, specifically relating to a coupled method and system for preparing jade core stone from gypsum waste residue and producing sulfuric acid as a byproduct. The coupled method includes: drying the gypsum waste residue in a first drying device to obtain semi-dry gypsum waste residue, then drying the semi-dry gypsum waste residue in a second drying device to obtain anhydrous gypsum raw material; mixing and grinding the anhydrous gypsum with pre-set auxiliary materials, and then processing it through a melting furnace roasting device, a calendering device, and a segmented crystallization annealing device to prepare jade core stone products, wherein the waste heat from the melting furnace roasting device, the calendering device, and the segmented crystallization annealing device is all returned to the second drying device; during the calcination of the anhydrous gypsum mixed and ground with pre-set auxiliary materials in the melting furnace roasting device, the sulfur-containing flue gas generated during the calcination process is collected and sequentially treated through a waste heat recovery device, a purification drying device, and a two-transfer two-absorption device to obtain industrial-grade sulfuric acid.

The utility model relates to a mining area ecological restoration and foundation treatment structure based on microbial mineralization. The mining area ecological restoration and foundation treatment structure comprises a microbial macadam three-dimensional reinforcing structure of a middle-shallow layer, a microbial solution and a reaction solution are injected through a pre-buried grouting floral tube, calcium carbonate precipitates are generated and cemented with macadam to form a three-dimensional reinforcing layer, water is rapidly drained, and the bearing capacity of a foundation is improved; the deep layer is sealed by three layers of polyvinyl chloride films, and is combined with a horizontal drainage cushion layer and a drainage plate to form a vacuum combined surcharge preloading system to accelerate drainage of water in the deep layer; the backfill soil is formed by mixing mine tail mud with external soil, and recycling of the tail mud is achieved through layered paving and rolling; the disc pit tunnel is formed by spiral cutting along the mine pit wall, kerbs and stand columns are reserved to guarantee passing safety, and cut stones are recycled. And a horizontal / vertical observation marker post is used for monitoring the displacement and settlement of the foundation. The utility model solves the problems of tail mud stockpiling, low construction efficiency and low foundation stability, and has the advantages of environmental protection, economy and high efficiency.