A coarse coal slime classifying system and method are disclosed. The system includes: a coal slime bucket, an arc-shaped sieve, a hydraulic classifying cyclone, a coal slime centrifuge, and a coal slime chute. The coal slime bucket is connected to a coal slime water incoming pipe. The hydraulic classifying cyclone is connected to the arc-shaped sieve and the coal slime bucket. The arc-shaped sieve is connected to the coal slime bucket and the coal slime centrifuge. The coal slime centrifuge is connected to the coal slime chute and the coal slime bucket. The coal slime bucket, arc-shaped sieve, hydraulic classifying cyclone, coal slime centrifuge, and coal slime chute are arranged to classify coarse coal slime, which improves the product quality and the yield. The system is simple in overall structure, convenient to maintain, and low in cost.

The present disclosure provides a dehydration and upgrading system for a high-water-content material, including a reaction kettle, a steam generator and a steam recovery apparatus, wherein the steam generator and the steam recovery apparatus are located at left and right sides of the reaction kettle respectively, and are connected through steam pipelines; a pressure sensing device is arranged on the reaction kettle to sense the pressure therein; a feed port is formed at an upper end of the reaction kettle; a discharge port is formed at a lower end of the reaction kettle; a discharge conveying belt is arranged below the discharge port; a high-pressure air pipe is arranged on one side of the middle part of the reaction kettle; and a high-pressure air valve is arranged on the high-pressure air pipe.

The present disclosure provides a hierarchical separating and grading method of coal gangue, and belongs to the technical field of coal gangue treatment and resource utilization. According to differences in the composition and properties of coal gangue, especially differences in Hardgrove grindability index (HGI), the present disclosure performs hierarchical crushing and screening to separate coal gangue into coal, sand, stone and soil. The coal can be used as a fuel for a coal gangue power plant or as an ordinary fuel. The sand and stone can be used to prepare manufactured sand and stone. The soil can replace loess for filling or preparing a building material. Obviously, by separating coal gangue into different components through hierarchical separating and grading, the present disclosure can achieve all-components utilization and effective reduction of the coal gangue.

The invention relates to a method and system for the environmental remediation of materials that are contaminated with heavy minerals, such as heavy metals. The invention finds utility in removing heavy minerals from materials such as soils, sediments, mine tailings and ores. The invention provides a means for removing heavy minerals from contaminated materials without the use of water while reducing the generation of dust. Thus, the invention provides an environmentally friendly method for the remediation of sites that are contaminated with heavy minerals.

The present disclosure relates to the field of mineral processing and separation, and in particular, to an underground coal hypergravity field separation system and a separation process. The separation system includes a grading hydrocyclone group, hypergravity field separators, feeding pumps, and conveying pumps. Coal collected underground is graded through a grading hydrocyclone first, then is fed into the hypergravity field separators for separation, and finally, is conveyed to a next link for dehydration through the conveying pumps. The separation system of the present disclosure has less supporting equipment, small floor area, and no complex pipeline, and is suitable for a downhole operation. In addition, the hypergravity field separators can provide a high-strength centrifugal acceleration, which can realize rapid separation of coal gangue particles in a radial direction and a tangential direction, and realize effective separation of fine coal gangue particles.

A disclosed system and method are configured to process waste via a frontend processing module configured to crush, grind, aggregate and concentrate waste from a coarse material to a finer material including an iterative reprocessing of any oversized components. The disclosed system also includes a classifying module to separate the coarse material from the finer material via a process water and at least one microgrinder and fractioning centrifuge. The disclosed system further comprises a backend processing module configured for further classifying the respective coarse and fine material for energy production and dewatering, recovering and combusting component materials. System submodules are configured to microgrind and gasify or pyrolize a resulting particle slurry into a combustible synthetic gas release for electricity generation and heat. The system is applied to waste recovery of waste glass, electronics waste, coal piles, coal water fuels, biofuels, algae lipid oils, and various precious minerals.

Fine coal is cleaned of its mineral matter impurities and dewatered by mixing the aqueous slurry containing both with a hydrophobic liquid, subjecting the mixture to a phase separation. The resulting hydrophobic liquid phase contains coal particles free of surface moisture and droplets of water stabilized by coal particles, while the aqueous phase contains the mineral matter. By separating the entrained water droplets from the coal particles mechanically, a clean coal product of substantially reduced mineral matter and moisture contents is obtained. The spent hydrophobic liquid is separated from the clean coal product and recycled. The process can also be used to separate one type of hydrophilic particles from another by selectively hydrophobizing one.

The present disclosure relates to a green method for producing and exploiting multiple nano-carbon polymorphs from coal commonly known as anthracite, meta-anthracite, and semi-graphite. The method disrupts the prevalent environmentally unfriendly practices of burning coal with poor profitability and sustainability because the method yields an unexpectedly rich mixture of high-performance nano-materials, comprising carbon nano-fibers, carbon nano-tubes, carbon nano-onions, nano-graphite-plates, and nano-graphene-disks, by simply mechanically-comminuting coal to nano-size, with minimal sorting efforts. The resulting total-yield of nano-carbon polymorphs is over 50% by weight from properly selected coal. Innovative means are added to the prevalent comminution and sorting practices to further reduce energy and chemical consumption. More importantly, the method also refines the comminution and sorting details for producing the best custom-made formulations. This holistic engineering approach eliminates unnecessary separation and sorting steps because a custom-made formulation typically requires blending the sorted components. Formulations with mixed nano-carbon polymorphs are engineered as new and high-valued-added composite ingredients to critically raise the performance of cement-based, polymer-based, and metal-based composites.

A system for separating coal from iron oxide and sulfur comprises a first tank having crusher to grind the coal. Steam is directed into the first tank to mix with the coal to produce a maximum substrate area for chemolithotrophic bacteria and algal species to act upon. A mechanical pulverizer is fed with the coal and steam. A sieve and a second tank receiving the coal from the pulverizer apparatus. An air exchanger connected to the second tank collects nanosized particulates of coal. A pipeline feeds the coal within the second tank with a mixture of chemolithophic bacteria from a breeding tank. A holding tank receives the mixture of coal and chemolithophic bacteria. A centrifuge receives the mixture of coal and chemolithophic bacteria from the holding tank and separates the coal from the mixture. A fourth tank receive the separated and hydrated coal particles from the centrifuge.

Disclosed is an underground coal preparation process adopting a water medium, comprising: feeding exploited raw coal into a Φ25 mm raw coal classifying screen for screening; performing dry coal preparation on a classifying screen oversize product with a particle size greater than 25 mm and feeding a classifying screen undersize product with a particle size less than 25 mm into a special underground compact jigging machine for sorting to obtain jigging machine overflow clean coal, jigging middling coal and jigging gangue; screening and dewatering the jigging machine overflow clean coal to obtain a clean coal product, and screening and dewatering the jigging middling coal to obtain a middling coal product, sorting slime water to be sorted and generated during sorting to obtain coarse clean coal slime and coarse middling coal slime, and performing circulating water treatment on a final liquid.