The present disclosure relates to the technical field of preparation of supercapacitor and geopolymeric concrete and discloses a carbon nanotube fly ash composite material and a preparation method and use thereof. The carbon nanotube fly ash composite material comprises an acidified carbon nanotube fiber fabric and a fly ash compound attached to the acidified carbon nanotube fiber fabric, wherein the fly ash compound comprises a cementitious material, a fine aggregate, an alkali activator, and carbon fibers, wherein the cementitious material is a mixture of fly ash, slag, and silica fume. The carbon nanotube fly ash composite material has desirable strength, ductility, and specific surface area, and an asymmetric supercapacitor prepared with the carbon nanotube fly ash composite material has stable properties, high charge-discharge efficiency, and high energy density and power density, and can be utilized in the aspects of large-capacity energy storage such as dwelling, transportation and industrial application.

A method for synthesizing metakaolin-based alkali-activated composites with improved fresh and mechanical properties over previous methods. This can be achieved, for example, by employing waste from the steel production industry, i.e., the metakaolin in the composites can be replaced by electric-arc furnace dust (EAFD) at high replacement levels (up to 90%). The replacement by EAFD (1-90%) can elongate the setting time, improve the mix flowability/workability, enhance the compressive strength, reduce the water to binder content and/or alkaline solution needed for the binder activation of alkali-activated composites. Additionally, another embodiment relates to a procedure for producing alkali-activated composites with 100% EAFD. In addition to solving issues related to the manufacturing of metakaolin-based alkali-activated composites, or similar composites thereof, the present subject matter provides a way to dispose of hazardous EAFD in large quantities.

A method for synthesizing metakaolin-based alkali-activated composites with improved fresh and mechanical properties over previous methods. This can be achieved, for example, by employing waste from the steel production industry, i.e., the metakaolin in the composites can be replaced by electric-arc furnace dust (EAFD) at high replacement levels (up to 90%). The replacement by EAFD (1-90%) can elongate the setting time, improve the mix flowability/workability, enhance the compressive strength, reduce the water to binder content and/or alkaline solution needed for the binder activation of alkali-activated composites. Additionally, another embodiment relates to a procedure for producing alkali-activated composites with 100% EAFD. In addition to solving issues related to the manufacturing of metakaolin-based alkali-activated composites, or similar composites thereof, the present subject matter provides a way to dispose of hazardous EAFD in large quantities.

A wastewater treatment system, including a wastewater phase-separation device, may be used to combine at least one primary treatment chemical and wastewater to produce cleaned water and a sludge byproduct. The wastewater treatment system may also include a wastewater dewatering device that may be used to combine the sludge byproduct and at least one secondary treatment chemical to produce a Medium to High Solids Content Sludge without excess water. A method for producing sludge for cement manufacturing may include combining wastewater and at least one primary treatment chemical to form a liquid phase and a solid phase, where the liquid phase includes clean water and the solid phase includes a sludge byproduct, separating the liquid phase from the solid phase, combining the solid phase with at least one secondary treatment chemical to form an intermediate that contains excess water, and removing the excess water from the intermediate to form a Medium to High Solids Content Sludge.

A wastewater treatment system, including a wastewater phase-separation device, may be used to combine at least one primary treatment chemical and wastewater to produce cleaned water and a sludge byproduct. The wastewater treatment system may also include a wastewater dewatering device that may be used to combine the sludge byproduct and at least one secondary treatment chemical to produce a Medium to High Solids Content Sludge without excess water. A method for producing sludge for cement manufacturing may include combining wastewater and at least one primary treatment chemical to form a liquid phase and a solid phase, where the liquid phase includes clean water and the solid phase includes a sludge byproduct, separating the liquid phase from the solid phase, combining the solid phase with at least one secondary treatment chemical to form an intermediate that contains excess water, and removing the excess water from the intermediate to form a Medium to High Solids Content Sludge.

Geopolymer compositions incorporating slag or other alumino-silicate and calcium containing binder components are described. The geopolymer compositions incorporate C-(N)-A-S-H/C-A-S-H gels providing improved adhesion strength and resistance to chemical attack. Methods of methods of making and using the geopolymers are further described, with the embodied geopolymers being compatible with multiple conventional application processes, including pouring, spraying, screeding, and troweling.

Methods and systems for calcining dewatered tailings and/or mine waste are disclosed herein. In some embodiments, the method comprises (i) processing dewatered tailings comprising clay minerals, (ii) calcining the processed tailings to produced calcined tailings, and (iii) altering a composition and/or one or more characteristics of the calcined tailings to produce a cementitious product. Altering the composition can include blending the calcined tailings with one or more additives, such as lime, dolomitic lime, lime kiln dust, argillaceous limestone, limestone, pulverized quicklime, ground calcium carbonate, quicklime, gypsum, natural pozzolans, artificial pozzolans, water, flow aids, or the like.

A method for synthesizing metakaolin-based alkali-activated composites with improved fresh and mechanical properties over previous methods. This can be achieved, for example, by employing waste from the steel production industry, i.e., the metakaolin in the composites can be replaced by electric-arc furnace dust (EAFD) at high replacement levels (up to 90%). The replacement by EAFD (1-90%) can elongate the setting time, improve the mix flowability/workability, enhance the compressive strength, reduce the water to binder content and/or alkaline solution needed for the binder activation of alkali-activated composites. Additionally, another embodiment relates to a procedure for producing alkali-activated composites with 100% EAFD. In addition to solving issues related to the manufacturing of metakaolin-based alkali-activated composites, or similar composites thereof, the present subject matter provides a way to dispose of hazardous EAFD in large quantities.

A method for synthesizing metakaolin-based alkali-activated composites with improved fresh and mechanical properties over previous methods. This can be achieved, for example, by employing waste from the steel production industry, i.e., the metakaolin in the composites can be replaced by electric-arc furnace dust (EAFD) at high replacement levels (up to 90%). The replacement by EAFD (1-90%) can elongate the setting time, improve the mix flowability/workability, enhance the compressive strength, reduce the water to binder content and/or alkaline solution needed for the binder activation of alkali-activated composites. Additionally, another embodiment relates to a procedure for producing alkali-activated composites with 100% EAFD. In addition to solving issues related to the manufacturing of metakaolin-based alkali-activated composites, or similar composites thereof, the present subject matter provides a way to dispose of hazardous EAFD in large quantities.

A method for producing supplementary cementitious material. The method comprises contacting a mineral stream with an acid to form an activated mineral stream; reducing the moisture content of the mineral stream; and comminuting the mineral stream to form a supplementary cementitious material. A method of extracting a metal from a mineral stream. The method comprises contacting a mineral stream with an acid to form an activated mineral stream; filtering the activated mineral stream to extract leach liquor comprising the metal; and neutralizing the acid.