65results about How to "Calcined evenly" patented technology

The invention relates to a desulfurized gypsum comprehensive treatment process in particular to a method for preparing building gypsum by desulfurized gypsum and a device of the building gypsum. An adopted technical solution is that the method for preparing the building gypsum by the desulfurized gypsum comprises the following steps: drying a desulfurized gypsum raw material with hot air, wherein the baking temperature is controlled between 110-130 DEG C and a water content after drying is smaller than or equal to 3%; calcinating the dried gypsum, wherein the clacinating temperature is between 150-160 DEG C and the calcinating time is between 20-40 minutes; cooling the calcinated gypsum to 50-60 DEG C, feeding the cooled material to a ball mill for pulverizing, wherein a particle size of the pulverized material is more than 200 meshes.

The invention belongs to the field of environmental protection materials, and specifically relates to an adsorption-type bone apatite and its preparation method and application. During the preparation, the organic matter in the animal bone is removed; the animal bone from which the organic matter has been removed is calcined to obtain the bone apatite; The phosphoric acid solution is used to chemically modify the surface of the bone apatite to obtain the adsorbed bone apatite. The adsorption-type bone apatite of the present invention can be used to adsorb heavy metal ions in industrial sewage, compared with the specific surface area before modification from 47.832 (m 2 / g) increased to 131.566(m 2 / g); in Pb 2+ When the initial concentration is 200mg / L, the removal rate can reach 98.3%. For the initial concentration of 200mg / LZn 2+ 、Cu 2+ Ions, the removal rate can reach more than 70%, and it has good ability to remove heavy metal ions. The invention solves the technical problem of insufficient bone apatite adsorption capacity in the prior art.

The invention discloses an annular lime shaft kiln. The annular lime shaft kiln comprises kiln bodies, wherein each kiln body consists of an outer ring wall and an inner ring wall, an annular cavity is formed between the inner ring wall and the outer ring wall, lintels through which the outer ring wall and the inner ring wall are connected are arranged in the annular cavity, the annular cavity is divided into a preheating zone, a calcining zone and a cooling zone from up to down, and burner nozzles are respectively arranged at the parts at the calcining zone of the outer ring wall and the inner ring wall; a distribution mechanism is arranged at the upper ends of the annular cavities, a discharging mechanism is arranged at the bottoms of the annular cavities, a feeding mechanism, a combustion supporting mechanism, a cooling mechanism and a waste-gas dust-removal system are arranged on the outer sides of the inner ring walls and the outer ring walls. The annular lime shaft kiln adopts annular structures of the inner ring walls and the outer ring walls, so that the air in the kiln bodies can be uniformly distributed, limestone can be uniformly calcined in a plurality of directions, and the phenomenon that limestone is stuck is avoided; the annular lime shaft kiln has the characteristics of being high in production efficiency, low in energy consumption, environment-friendly, safe in running, simple to operate, small in occupied area, low in investment, and the like.

The invention discloses a method for preparing a metal oxide layer on the electrolyte surface of a sodium battery, belonging to the field of sodium batteries. A method for preparing a metal oxide layer on the electrolyte surface of a sodium battery can be achieved by arranging a vaporization membrane shell and cooperating with loose pressing at the same time. Effectively ensure the gap between the mixtures, effectively ensure that the internal and external heating is more uniform during calcination, which is convenient to improve the efficiency and uniformity of the first calcination. , the solidified thermoplastic sealing layer is heated and melted and flows away. At this time, the pressurized inert gas in the side wall of the semi-open shell is ejected from the double Y-shaped holes at high temperature, thereby effectively making the gasification membrane shell The mixture can become more porous and looser under the action of air flow, which is convenient for the calcination inside the mixture to be more uniform, thereby effectively improving the metal oxide layer of the later stage sodium battery, and further improving the quality of the sodium battery using the metal oxide layer.

The invention discloses a lithium-ion battery nickel-cobalt-lithium-manganese-oxide positive electrode material and a preparation method thereof, belonging to the technical field of preparation of lithium-ion battery positive electrode materials. The preparation method comprises the following steps: 1, lithium salt, nickel salt, cobalt salt And dissolving the manganese salt in a solvent to obtain a first solution, wherein 0<x<1, 0<y<1; 2, adding a chelating agent and a carbon source to the first solution, and mixing them uniformly to obtain a second solution; 3 , to obtain the precursor powder after removing the solvent in the second solution; 4. In an inert gas atmosphere, first heat the precursor powder at a temperature of 300-400° C. for 0.5-2 hours, and then use infrared light to As a heat source, the temperature of the precursor powder is raised to 800-900° C., and the temperature is kept for 3-4 hours; after cooling, the lithium-ion battery nickel-cobalt-lithium-manganese-oxide cathode material is obtained. The obtained nickel-cobalt lithium manganese oxide cathode material has regular shape and uniform size; meanwhile, heating time is shortened, energy is saved, and cost is reduced.