10 results about "Ferric Compounds" patented technology

The application discloses a preparation method of a ferroferric oxide electrode material and application of the ferroferric oxide electrode material in an electrode, a device and a method for photoelectrocatalytic degradation of phenol. The electrode is prepared by in-situ adhering a layer of uniform iron-containing intermediate on the surface of a metal mesh through thermal decomposition of an iron-containing compound, and converting the layer of the iron-containing intermediate into ferroferric oxide through heat treatment. The obtained electrode can realize photoelectrocatalytic complete degradation of water-phase phenol under irradiation of ultraviolet light, and the performance is far higher than that of a ferroferric oxide electrode based on a metal sheet and a ferroferric oxide electrode based on FTO under the same conditions. The preparation method has mild conditions, a simple and controllable process, and high raw material utilization rate; the prepared electrode is low in price, environment-friendly and non-toxic, uniform and dense in the film layer, high in catalyst loading per unit area, and can simultaneously improve the two problems of poor light condition and low material exchange rate existing in a photoelectrocatalytic water-phase phenol degradation system, and has high practical application value.

The application belongs to the technical field of building material preparation, and provides a foamed ceramic prepared by self-foaming of contaminated soil and red mud. The contaminated soil and the red mud are dried, crushed, sieved, mixed, and then raw materials are obtained; the raw materials are added with a reducing agent and a catalyst and are ball milled to obtain a mixture; the mixture is stacked and placed in a mold, calcined in a furnace, and then cooled to obtain the foamed ceramic. By changing the ratio of the contaminated soil and the red mud, the amount of gas generation is regulated, self-foaming is realized, and the foamed ceramic is prepared by using all solid wastes; by matching the use of the reducing agent, the catalyst and the all solid waste raw materials, the reaction of the difficult-to-reduce compounds in the red mud is promoted, and then the easy-to-reduce iron-containing compounds are separated out, so that the reduction is sufficient, the gas production efficiency is improved, and the gas production temperature is reduced.

Provided is an exhaust gas purification catalyst that exhibits a high Nox conversion rate and excellent reduction catalyst activity not only in a low temperature region of 400°C or lower but also in a high temperature region of higher than 400°C. An exhaust gas purification catalyst (20) is used as a catalyst for a purification reaction for purifying an exhaust gas, and comprises: a noble metal (231); an oxygen absorption / release material (213) that has an oxygen absorption ability and an oxygen releasing ability; and an iron-containing compound (211) that is supported on the oxygen absorption / release material (213). The oxygen absorption / release material (213) contains yttrium, cerium, zirconium, and iron. When cerium exists as cerium oxide (CeO2) and iron exists as iron oxide (Fe2O3) in the oxygen absorption / release material (213), the following expression is satisfied: [content (mass%) of iron oxide in oxygen absorption / release material] > 0.38-0.02 × [content (mass%) of cerium oxide in oxygen absorption / release material].

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.

The invention provides a copper slag all-component high-value utilization method, which belongs to the technical field of metallurgical waste slag resource utilization, and comprises the following steps: heating copper slag in H2 / N2 atmosphere by adopting double-frequency alternating microwaves, and reducing an iron-containing compound into metal iron; after the reduced material is crushed, a metal iron concentrate is separated out through magnetic separation; the magnetic separation residues are mixed with a CaCl2-MgCl2-NaCl composite chlorinating agent, chlorination is conducted under the multi-temperature-zone gradient heating condition, and step-by-step chlorination volatilization of valuable metal such as copper, zinc and lead is achieved; the preparation method comprises the following steps: adding a TiO2-Cr2O3-ZrO2 composite nucleating agent and a CaO-MgO composite additive into chlorination residues, and carrying out melting, molding and non-equilibrium crystallization treatment, so as to prepare the diopside microcrystalline glass. According to the method, preferential extraction of iron in the copper slag and segmented efficient recovery of metals such as copper, zinc and lead are achieved, and the silicate tailings are thoroughly converted into a glass ceramic building material with a high additional value.

This invention discloses a hydrocracking catalyst and its preparation method, as well as a crude oil hydrocracking process. The preparation method includes the following steps: (1) preparing spherical material A; (2) preparing a first modified organic polymer and a second modified organic polymer; (3) placing material A in a ball rolling machine, and uniformly introducing the first modified organic polymer, the second modified organic polymer, boehmite powder, and a heated organic polymer aqueous solution while rolling, and obtaining material B after treatment; (5) subjecting material B to low-temperature heat treatment, then mixing it with an iron-containing compound, drying and calcining to obtain a support, further introducing a hydrogenation metal component, and then drying and calcining to obtain a hydrocracking catalyst. A hydrocracking catalyst is also provided, comprising a hydrogenation metal component, an auxiliary agent iron oxide, a support, and optionally phosphorus pentoxide. The hydrocracking catalyst provided by this invention has a spherical core-shell structure, possessing high cracking activity, strong impurity removal capacity, and containment capacity, making it suitable for direct hydrocracking reactions using crude oil as feedstock.

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.

The invention discloses a glass waste iron removal method which comprises the following steps: S1, crushing and grinding glass waste to change the glass waste into glass powder; s2, adding a carbonaceous reducing agent into the obtained glass powder, and fully mixing the carbonaceous reducing agent with the glass powder; s3, the mixed glass powder is heated, the heating temperature ranges from 350 DEG C to 400 DEG C, the heating time ranges from 40 min to 60 min, and nonmagnetic iron in the glass powder is converted into ferromagnetic iron; s4, iron in the glass powder is adsorbed away through an iron removal device; and S5, removing the carbonaceous reducing agent in the glass powder. The method has the beneficial effects that nonmagnetic or weakly magnetic iron compounds in the glass wastes are converted into ferroferric oxide with strong magnetism by utilizing a carbon thermal reduction method, so that iron impurities can be efficiently separated from the glass wastes by utilizing a magnetic separation method.

The invention discloses a method for recycling valuable metals by using a precious metal waste catalyst, lead-zinc slag and waste cathode carbon, and belongs to the technical field of metal resource recycling. The method comprises the following steps: grinding and screening a waste noble metal catalyst, lead-zinc slag and waste cathode carbon, uniformly mixing with a fluxing agent, carrying out reduction smelting, reducing Fe < 3 > O < 4 >, Fe2SiO4 and other iron-containing compounds in the process to generate a metal simple substance, capturing noble metals (platinum, palladium, rhodium and silver) to form a Fe-based alloy, and cooling the molten slag at a high temperature to prepare the environment-friendly aluminosilicate microcrystalline glass. According to the method, CaO-SiO2-Al2O3-MgO-Na2O in the mixed slag is used as a slag system, a fluxing agent is CaO, Na2O, SiO2 and Na2B4O7. 10H2O, the waste cathode carbon is used as a reducing agent to recover valuable metals, and the recovery rates of platinum, palladium, rhodium, silver, iron and zinc are up to 99.72%, 98.17%, 98.27%, 99.87%, 98.65% and 99.99% respectively. According to the method, the precious metal waste catalyst, the lead-zinc slag and the waste cathode carbon are comprehensively utilized, and the method has great significance in green and efficient recovery of valuable metal.