98 results about "Black ferric oxide" patented technology

The invention relates to a method for electrolyzing ferric oxide by using a deep eutectic solvent to prepare ferroferric oxide and belongs to the technical fields of wet metallurgy and materials. The method comprises the following steps: preparing a cathode plate, namely mixing ferroferric oxide with PVA binder and a pore-forming agent; pressing and molding, and then roasting at 800 DEG for 3 hours to prepare the cathode plate; preparing a deep eutectic solvent, namely mixing choline chloride with ethylene glycol evenly to form the deep eutectic solvent; carrying out direct-current electrolysis on graphite serving as an anode and the prepared cathode plate serving as a cathode in the deep eutectic solvent so that ferric oxide on the cathode plate is reduced into ferroferric oxide; and carrying out ultrasonic washing and vacuum drying on the obtained ferroferric oxide by using ethanol and distilled water, so as to obtain ferroferric oxide. The method is short in technological process, simple in preparation method, low in energy consumption and low in demands on equipment.

The invention relates to a method for simultaneously removing magnesium oxide, ferric oxide and aluminum oxide sesquioxide in middle-grade and low-grade phosphate ores by adopting a double-reverse floatation process. The method adopts the double-reverse floatation process to remove MgO, Fe2O3 and Al2O3 so as to realize continuous production of an industrialization device. The method comprises the following process steps of: levigating raw phosphate ore, wherein more than or equal to 85 percent of raw phosphate ore is minus 200 messes in size, and the solid content of ore pulp is 20-45 percent; adding a No.1 mixed inhibitor in the ore pulp, introducing the regulated ore pulp into a floatation machine, adding a collecting agent CB-1, aerating, and collating, so as to obtain magnesium removal phosphate concentrate; adding a No.2 mixed inhibitor in the magnesium-removal phosphate concentrate, adding a collecting agent CB-2, aerating, and collating, so as to obtain crude phosphate concentrate without ferric oxide and aluminum oxide; and adding a collecting agent CB-3 into the crude phosphate concentrate without ferric oxide and aluminum oxide, aerating, and collating, so as to obtain high-grade phosphate concentrate. The method can simultaneously remove the content of magnesium oxide, ferric oxide and aluminum oxide from the concentrate, thus obviously improving the quality of the phosphate concentrate and lowering the production cost in follow-up acid making process.