Devices, systems, and methods for separating incinerator combined ash are described. The devices, systems, and methods include a fines process that utilizes water or other liquid in the separation of portions of the incinerator combined ash.

Bag house dust is combined with a carbon source and shaped into pellets or briquettes and used to recycle valuable metals present in the bag house dust.

A method of recovering bromide from bromine-containing smelting ash relates to the field of high efficient separation and recovery of bromine by total wet method. It especially relates to the method of high efficiency separation of bromine salt and lead, zinc recovery of circuit board smelting ash by two-step method. It mainly comprising: sub-molten salt leaching, washing, separate Lead and zinc by adjusting the pH of industrial sulfuric acid, membrane separation and concentration, reuse of water, crude bromine salt recovery by evaporation crystallization of bromine salt. Compared with the traditional baking and recycling process of ash, the invention adopts sodium hydroxide submolten salt leaching technology and membrane separation and concentration technology, to reduce the reaction temperature and tailings discharge greatly, which has a good effect of energy saving and emission reduction.

Disclosed is a method for enhancing leaching of metals in zinc hypoxide powder by mechanochemistry coupling with sonochemistry, comprising the following: mechanical activation: a raw material containing zinc hypoxide powder is mechanically activated so that an activated material is obtained; and ultrasonic treatment: the activated material is mixed with an acidic leaching solution to obtain a mixture, the mixture is subjected to ultrasonic treatment, and a liquid phase is obtained as the leachate. Mechanochemical activation and ultrasonic chemistry synergistically enhance the leaching efficiency and leaching rate of multiple metals through the destruction and cavitation of the zinc oxide powder structure. This process can indirectly reduce the concentration of the used acidic leaching solution and shorten the leaching duration. In practical production, the specific application of the process can reduce the anticorrosion cost and running cost of reaction equipment, indirectly leading to excellent production benefit.

A method and system of extracting iron oxide from ore is provided, which may include adding a chelating agent to an iron ore to form an iron ore and chelating agent solution, heating the solution to reflux in water, and filtering the solution to yield an extraction residue and a chelated iron solution. The chelated iron solution may be treated with a potassium hydroxide and water solution to yield iron hydroxide.

A method of making a zeolite comprises: adding a zeolite seed to a leach solution containing silicon and aluminum; and heating the leach solution to obtain the zeolite. The leach solution can be made by mixing coal ash with a basic stream, thereby creating (i) a leach solution containing silicon and aluminum, and (ii) leached ash; and separating the leach solution from the leached ash.

A method of making a zeolite comprises: adding a zeolite seed to a leach solution containing silicon and aluminum; and heating the leach solution to obtain the zeolite. The leach solution can be made by mixing coal ash with a basic stream, thereby creating (i) a leach solution containing silicon and aluminum, and (ii) leached ash; and separating the leach solution from the leached ash.

A process for the isolation and purification of substantially pure chemicals, including silica gel, sodium silicate, aluminum silicate, iron oxide, and rare earth elements (or rare earth metals, REEs), from massive industrial waste coal ash including a plurality of caustic extractions of coal ash at an elevated temperature, followed by an acidic treatment to dissolve aluminum silicate and REEs. Dissolved aluminum silicate is precipitated out by pH adjustment as a solid product while REEs remain in the solution. REEs are captured and enriched using an ion exchange column. Alternatively, the solution containing aluminum silicate and REEs is heated to produce silica gel, which is separated from the enriched REEs solution. REEs are then isolated and purified from the enriched solution to afford substantially pure individual REE by a ligand-assisted chromatography.

A process for the isolation and purification of substantially pure chemicals, including silica gel, sodium silicate, aluminum silicate, iron oxide, and rare earth elements (or rare earth metals, REEs), from massive industrial waste coal ash including a plurality of caustic extractions of coal ash at an elevated temperature, followed by an acidic treatment to dissolve aluminum silicate and REEs. Dissolved aluminum silicate is precipitated out by pH adjustment as a solid product while REEs remain in the solution. REEs are captured and enriched using an ion exchange column. Alternatively, the solution containing aluminum silicate and REEs is heated to produce silica gel, which is separated from the enriched REEs solution. REEs are then isolated and purified from the enriched solution to afford substantially pure individual REE by a ligand-assisted chromatography.

A method for producing a vanadate extracts a vanadium component included in combustion fly ash or clinker. In the method, a vanadium component is recovered as a vanadate from combustion fly ash or clinker, the method including the following steps 1 to 5: (1) a step of adding an aqueous sodium hydroxide solution to combustion fly ash or clinker so that the water content is 5 to 35% by mass (step 1); (2) a step of mixing or kneading (step 2); (3) a step of heating the mixed or kneaded mixture (step 3); (4) a step of adding water to the mixture that has undergone the heating step in the step 3 to form a slurry (step 4); and (5) a step of recovering a vanadate in the aqueous phase after the solid-liquid separation of the slurry (step 5).