3results about How to "Low reduction temperature" patented technology

This invention discloses a method for extracting magnesium and phosphorus from high-magnesium phosphorus tailings through vacuum carbothermic reduction, relating to the field of high-magnesium phosphorus tailings reuse technology. The method involves uniformly mixing phosphorus tailings, silica, magnesite, and coke, pressing them into briquettes, calcining them to remove crystal water, and coking them to obtain pellets. The phosphorus tailings are high-magnesium phosphorus tailings with an MgO content of 16%–18%. The pellets are placed in a vacuum furnace, maintaining a vacuum of 10–100 Pa, and heated to 1200–1500°C, held for 30–60 minutes. The steam from the reaction is recovered, and the steam is condensed at 400–600°C to obtain crude magnesium. The partially cooled steam is then passed into a cold water tank to recover the precipitate, which is then filtered to obtain yellow phosphorus. This method effectively reuses high-magnesium phosphorus tailings and further recovers the difficult-to-refine phosphorus, allowing phosphorus and magnesium to be extracted and recovered in the same equipment and process. Simultaneously, it fully utilizes the calcium and fluorine as additives, lowering the reaction temperature and significantly reducing production costs.

The application discloses low-cost sulfidized nano zero-valent iron based on a pyrite oxidation-reduction path and application thereof. Low-cost sulfidized nano zero-valent iron is obtained by the mode of air oxidation and then hydrogen reduction of cheap pyrite powder in a tube furnace. By adjusting and controlling parameters such as oxidation temperature, oxidation time and reduction time, the low-cost lattice-doped sulfidized nano zero-valent iron with a median particle size of less than 300 nm and a zero-valent iron content of 70% is prepared, and the preparation cost is far lower than that of a laboratory liquid-phase synthesis method. The material can effectively degrade trichloroethylene and florfenicol, and has a small hydrogen production amount and a high electron efficiency. The preparation method is simple and easy to operate, and has a large-scale production prospect, and the degradation performance of pollutants is close to that of laboratory-prepared sulfidized nano zero-valent iron, so the material has a prospect of being applied to actual groundwater pollution remediation.

The invention relates to the technical field of preparation of metal composite powder, in particular to a preparation process of tungsten-copper alloy powder, which comprises the following steps: S1, precursor compounding: performing electrochemical replacement reaction on a tungsten-containing substance and a copper-containing substance in a liquid phase to prepare a tungsten-copper composite precursor suspension; s2, freeze drying: performing spray freeze drying on the tungsten-copper composite precursor suspension to obtain fluffy porous precursor powder; and S3, reduction: performing low-temperature heat treatment on the precursor powder in a reducing atmosphere to obtain the tungsten-copper alloy powder. According to the method, copper atoms are directly subjected to reduction deposition on active sites of tungsten by utilizing the characteristic that electrochemical replacement reaction is carried out spontaneously, compounding on the atomic scale is achieved, and compared with physical mixing and surface coating of a copper plating method in the prior art, the uniformity of tungsten-copper two-phase mixing is effectively improved.