3results about How to "Lower quality requirements" patented technology

This invention relates to a method for non-explosive pyrolysis to enhance coal permeability and implement forced roof caving, belonging to the field of coal mine safety technology. The method involves injecting a pyrolysis agent into a borehole, which reacts, solidifies, and expands, generating expansion pressure that causes the coal or rock mass to crack, forming numerous secondary fractures. This improves the permeability of the coal or reduces the strength of the roof strata. Application scenarios include permeability enhancement of inclined coal seams, and permeability enhancement and forced roof caving of near-horizontal or horizontal coal seams. This invention utilizes the property of the pyrolysis agent itself—reaction, solidification, and expansion—to create secondary fractures in the coal (rock) mass, significantly improving coal permeability or reducing rock strength. It involves minimal electromechanical equipment and offers significant technical and economic benefits. For coal permeability enhancement operations in longwall mining faces, it strictly distinguishes between inclined, gently inclined, or near-horizontal coal seams, and differentiates the arrangement of process boreholes and gas drainage boreholes. The engineering workload is low, eliminating the need for blasting operations, and safety is extremely high.

This invention discloses a method for producing feed-grade granular high water-soluble phosphorus MDCP, comprising the following steps: 1) mixing phosphoric acid with a portion of calcium carbonate emulsion; 2) the premixed slurry entering a stirred tank reactor for deep reaction neutralization; 3) the reaction slurry being fed into a second tank reactor for secondary neutralization reaction; 4) the secondary neutralization reaction being stirred and granulated to generate granular semi-finished product; 5) drying to obtain the material; 6) the dried material being screened. This invention premixes purified phosphoric acid with a portion of calcium carbonate emulsion and then fully stirs and reacts it in a reaction tank to generate a large amount of high water-soluble calcium dihydrogen phosphate (MCP) slurry. The slurry forms a mixture with the remaining unreacted portion of phosphoric acid, which then undergoes a secondary reaction with the remaining calcium carbonate emulsion to generate dicalcium phosphate (MDCP) slurry. After granulation, drying, screening, and cooling, a qualified granular MDCP product with high water-soluble phosphorus content is obtained.