3results about How to "The reduction effect is obvious" patented technology

The invention discloses a continuous arsenic sulfide slag drying treatment system and method for corrosive waste gas filtration, and belongs to the technical field of hazardous waste treatment.The system comprises a box, and a closed feeding unit, a sectional type low-temperature drying unit and a discharging unit are arranged in the box; the sectional type low-temperature drying unit is circularly communicated with the corrosion protection unit and the heating air supply unit; the corrosion protection unit comprises a dry type filter unit, a wet type filter unit, a water condenser and a steam preheating recoverer, and is used for realizing graded purification, condensation dehumidification and heat energy recovery of corrosive waste gas; the heating air supply unit provides heated circulating air for the drying unit, and the sectional type low-temperature drying unit adopts a PVC + nylon anti-corrosion mesh belt and an ash removal scraping belt, so that closed drying and anti-scattering ash removal of materials are realized. According to the method, the whole-process closed drying of the arsenic sulfide slag is achieved, the weight reduction rate reaches 40% or above, the corrosive gas removal rate reaches 98% or above, the energy utilization rate is high, and the method is suitable for large-scale treatment of the arsenic sulfide slag in the non-ferrous metal smelting industry.

This invention relates to a method for the resource recovery of rare earth, thorium, and iron from iron-thorium slag. The method includes the following steps: (1) finely grinding the iron-thorium slag; (2) uniformly mixing the finely ground iron-thorium slag with reducing carbon powder, and then roasting them together in a muffle furnace to obtain roasted slag; (3) mixing the roasted slag with alkaline solution and then placing it in a sealed container for high-temperature alkaline conversion reaction to obtain alkaline conversion slag; (4) washing the alkaline conversion slag with water to remove fluoride and aluminum, and then filtering and drying it to obtain water-washed slag; (5) subjecting the water-washed slag to acid dissolution reaction, and after separation, obtaining a thorium-containing rare earth solution and an acid-leached slag respectively; (6) after deep impurity removal, transferring the thorium-containing rare earth solution to an extraction system to separate and purify rare earth and thorium elements. This invention solidifies most of the iron in the iron-thorium slag in the form of goethite through high-temperature roasting, avoiding the loss of rare earth caused by the subsequent leaching process, and has the advantages of high rare earth recovery rate, low slag rate, and low auxiliary material consumption.

The invention discloses an efficient resourceful treatment method of firework and firecracker waste residues, which comprises the following steps: S1, sulfur dissolving separation: placing the firework and firecracker waste residues in a sulfur dissolving agent, and carrying out hot filtration separation to obtain a sulfur-containing clear liquid and desulfurized residues; cooling and separating out the sulfur-containing clear liquid, and carrying out solid-liquid separation to obtain sulfur and a sulfur dissolving liquid; s2, slurrying and leaching: adding the desulfurization residues into concentrated sulfuric acid to carry out slurrying reaction, dissolving magnesium and aluminum components, and carbonizing and decomposing lead fibers at the same time; s3, solid-liquid separation and flotation: diluting and cooling the material after the pulpifying reaction, and carrying out solid-liquid separation to obtain a leachate containing magnesium and aluminum ions and residues after leaching; and S4, magnesium aluminate spinel preparation: adjusting the pH value of the leachate to separate out magnesium and aluminum in a precipitation form, filtering, drying filter residues, and calcining to obtain the magnesium aluminate spinel. According to the method, sulfur, magnesium, aluminum and other resources in the waste residues can be safely and efficiently separated and recycled, meanwhile, the final residues are subjected to harmlessness, the amount and volume of the residues are greatly reduced, and the method is suitable for industrial-scale continuous production.