4 results about "Roasting" patented technology

The invention discloses a full-tooth continuous quenching method of a slewing bearing, which comprises the following steps: (1) selecting equipment and raw materials: preparing an electric furnace, a filter press, a dissolving tank, a single-effect evaporator, a filter screen, an extraction tank and a steam boiler, and preparing rare earth fluorescent powder waste, caustic soda flakes, hydrochloric acid, a P507 extraction agent, water, caustic soda liquid and kerosene; and placing the mixed mixture in an electric furnace for calcining. According to the full-tooth continuous quenching method for the slewing bearing, the caustic soda flakes are utilized and subjected to low-temperature roasting in the electric furnace, so that the caustic soda flakes react with the caustic soda flakes, rare earth elements in the rare earth fluorescent powder waste are converted, and therefore the subsequent reaction is not direct reaction of the rare earth elements and acid, but neutralization reaction of the converted alkaline substances and the acid is achieved; the reaction can be quicker, so that the reaction efficiency is greatly improved.

The invention belongs to the technical field of clean coal carbon preparation, and particularly relates to a chemical purification method for preparing ultralow ash coal from clean coal, which comprises the following steps: S1, oxygen-isolated activated roasting: roasting clean coal in an oxygen-free environment to obtain an oxygen-isolated activated roasting product; s2, low-temperature alkali dissolution and silicon separation: adding the oxygen isolation activated roasting product obtained in S1 into a caustic alkali solution, dissolving out active silicon at low temperature, and filtering to obtain aluminum-containing coal and silicon-containing filtrate; and S3, high-temperature alkali dissolution and aluminum separation: adding the aluminum-containing coal obtained in S2 into a sodium aluminate solution, dissolving out aluminum at a high temperature, and filtering and washing to obtain ultralow-ash coal and the sodium aluminate solution. The method provided by the invention can realize deep purification of coal and preparation of ultralow ash coal, and can realize resource recovery of silicon and aluminum and cyclic utilization of alkali liquor at the same time, thereby providing a new technical idea for extraction of ultralow ash carbon in coal industry and realization of high-valued upgrading of products, and overcoming the defects of the existing method at the same time.