2results about How to "Good recycling performance" patented technology

The invention discloses a waste gas treatment method in a sodium hypophosphite production process, and belongs to the technical field of hydrogen phosphide adsorption. The waste gas treatment method in the sodium hypophosphite production process is used for solving the technical problems that in the prior art, a hydrogen phosphide solid adsorbent is low in specific surface area and few in hydrogen phosphide adsorption sites, and the cyclic adsorption performance of the solid adsorbent on hydrogen phosphide needs to be further improved. Comprising the following steps: adding loaded modified carbon powder, modified diatomite, red mud, a foam stabilizer, sodium silicate and purified water into a reaction kettle, stirring at room temperature for 30-50 minutes, adding a foaming agent into the reaction kettle, and stirring for 30-60 seconds to obtain mixed slurry. According to the invention, the composite materials such as the loaded modified carbon powder, the modified diatomite and the red mud are mixed, and the dosage proportion of each component is optimized, so that the specific surface area of the adsorbent microsphere is effectively increased, and the adsorbent microsphere has excellent adsorption capacity and cyclic regeneration performance on hydrogen phosphide in waste gas.

The invention discloses a method and a system for directionally removing non-volatile acid radicals and recovering urea in high-concentration urea wastewater, and belongs to the technical field of wastewater treatment and resource recovery. The method comprises the following steps: firstly, introducing wastewater into a pretreatment unit, adding a synergistic treatment agent compounded by alkali metal salt, an organic complexing agent and nano catalytic particles, and directionally precipitating non-volatile acid radicals to form a compact precipitate; intensified solid-liquid separation is completed through an ultrasonic-assisted horizontal spiral discharging sedimentation centrifuge, residual acid radicals in supernate are deeply adsorbed through graphene quantum dot-temperature responsive magnetic nanoparticle composite modified anion exchange resin, and the acid radicals are almost completely removed; then, urea is concentrated by adopting a low-temperature evaporation-waste heat recovery coupling process, and high-purity urea crystals are separated out through segmented temperature-pressure gradient crystallization; the resin saturated by adsorption is separated and recovered through a magnetic field, and is recycled after temperature regulation and mild regeneration; the method is suitable for resourceful treatment of industrial high-concentration urea wastewater.