3 results about "Ferric Compounds" patented technology

Provided are: a novel complex capable of efficiently adsorbing and collecting arsenic (V) dissolved in water; and a novel arsenic adsorbent. This complex contains iron (III)-containing particles supported on microfibrous cellulose. At least a portion of the iron (III)-containing particles has an aspect ratio of 2 or more. The iron (III)-containing particles preferably contain at least one iron compound selected from iron oxides, iron hydroxides, and iron oxyhydroxides. This arsenic adsorbent contains the complex.

A method for improving the denitrification efficiency of low-temperature anaerobic ammonia oxidation includes simultaneously adding iron-sulfur-loaded hydrothermal char and raw hydrothermal char to a low-temperature operating anaerobic ammonia oxidation reactor at a rate of 1-10 g per liter. The operating temperature of the anaerobic ammonia oxidation reactor is 10-35°C, more preferably 10-15°C. The iron-sulfur-loaded hydrothermal char is obtained by roasting alkali-resistant aerobic denitrification granular sludge, loading it with iron and sulfur sequentially, and then drying it. The particle size of the iron-sulfur-loaded hydrothermal char is 10-500 μm, with an iron content of 1-5 wt% and a sulfur content of 0.5-3 wt%. The iron element is attached to the biochar in the form of Fe3O4, Fe2O3, and iron-sulfur compounds. The raw hydrothermal char is obtained by roasting alkali-resistant aerobic denitrification granular sludge at a roasting temperature of 150-250°C for 10-120 min. This method has the advantages of low biochar dosage, short adaptation period, good performance of anaerobic ammonia oxidation for nitrogen removal under low temperature conditions, and stable treatment effect.

This invention relates to a composite rare earth iron removal solvent and its preparation method, as well as its application in the iron removal of recycled A356 alloy. Belonging to the field of metal materials engineering technology, it aims to solve at least one of the following problems in existing iron removal solvents: low iron removal efficiency, incomplete iron removal, unstable boron-iron phase, poor slag-aluminum separation, significant environmental pollution, high energy consumption, and poor mechanical properties of the recycled A356 alloy after iron removal. In this invention, the iron removal solvent decomposes NH4BF4 to generate NH3 and HF bubbles, achieving in-situ stirring, degassing, and removal of oxide inclusions. Rare earth elements possess strong surface activity, adsorbing Al2O3 and fine inclusions and causing them to aggregate and float. Rare earth elements can synergistically interact with boron distributed in the aluminum melt within NH4BF4 to promote the precipitation and aggregation of iron-containing compounds, which then settle to the bottom of the crucible. This effectively reduces the impact of Fe content on the performance of the recycled A356 alloy. Furthermore, rare earth elements and MnF2 can modify the morphology of the Fe phase, significantly improving the elongation of the recycled A356 alloy.