65results about How to "Calcined evenly" patented technology

The invention belongs to the field of kiln, and provides a u-shaped internal-combustion rotating limekiln capable of recovering CO2. The limekiln is characterized in that the rotary kiln is horizontal, a u-shaped muffle heating furnace and a u-shaped calcining chamber are adjacently arranged inside the rotary kiln, blades are arranged on the inner wall of the muffle heating furnace and the inner wall of the calcining chamber, and a carbon dioxide collector is arranged through a limestone feeding inlet to communicate with the calcining chamber. Compared with present muffle rotary limekilns, the u-shaped internal-combustion rotating limekiln capable of recovering CO2 has significant advantages of reasonable structure, energy conservation, and emission reduction, and can recover and utilize materials and improve product quality.

The invention provides a method for preparing bamboo salt through temperature program, and relates to a preparation method of bamboo salt. The invention aims at providing a method for preparing bamboo salt by adopting a stage temperature program. The preparation method comprises the following steps: mixing raw materials; performing three-stage temperature rise calcining; cooling and crystalizing; and grinding. The method for preparing bamboo salt through temperature program, the loss of mineral substances is few, energy resources and raw materials can be saved, and the product bamboo salt has uniform quality and is high in quality. The method is used in the field of preparation of bamboo salt.

The invention discloses calcining equipment for a gypsum powder. The equipment comprises a calcining box, a pre-drying feeding device is arranged at the top of one side of the calcining box, and the interior of the calcining box is divided into a heating cavity and a calcining cavity through a heat conduction partition plate; a hot baking calcining device is arranged in the calcining cavity, the hot baking calcining device comprises a plurality of heat dissipation plates, and an adjusting part is arranged at the bottom of each heat dissipation plate; and a wind power calcination device is arranged at the bottom of the hot baking calcination device and comprises a wind power transmission component and a heating power component, the heating power component is arranged on one side of the heat conduction partition plate, the wind power transmission component is arranged at the bottom of the hot baking calcination device, the side wall of the heating cavity is provided with a transmission pipe, and the transmission pipeline is used for conveying hot air exhausted by the heating cavity into the pre-drying feeding device and the wind power transmission component. According to the calcining equipment, exhaust heat can be recycled, raw materials and clinker are convenient to separate, pollution of gypsum powder is avoided, and the processing quality is high.

The invention provides a control device and method for converter smelting through CO2 and argon of a rotary kiln. The control device comprises a rotary kiln part and a converter smelting part. An inner cylinder combustion chamber used for performing combustion to generate a heat source and an outer cylinder calcining compartment used for containing to-be-calcined limestone are arranged in the rotary kiln. A heat transmission wall is arranged between an inner cylinder and an outer cylinder. After carbon dioxide generated through calcination is collected through a preheater and a gas collecting pipe, dust removing, drying and pressurizing are carried out on the carbon dioxide, then the carbon dioxide enters pressure buffering tanks, and the clean carbon dioxide is obtained. The converter smelting part comprises a composite carbon dioxide and argon blowing control system mainly composed of the carbon dioxide and argon pressure buffering tanks, pressure detecting devices, flow detecting devices, temperature detecting devices, electromagnetic valves, adjusting valves and the like. During smelting, the respective electromagnetic valves and the respective adjusting valves are used for performing controlling, carbon dioxide blowing is carried out in the earlier stage and the medium stage, argon blowing is carried out in the later stage, and the electromagnetic valves and the adjusting valves can complement one another. According to the control device and method, the steelmaking production cost is reduced, the carbon emission and greenhouse effect can be reduced, and the control device and method conform to circular economy.

The invention belongs to the field of environment-friendly materials, and particularly relates to adsorption type bone apatite and a preparation method and application thereof. The preparation methodcomprises the following steps: removing organic matters in animal bones; calcining the animal bones without the organic matters to obtain bone apatite; and carrying out surface chemical modification on the bone apatite by adopting a phosphoric acid solution to obtain the adsorption type bone apatite. The adsorption type bone apatite can be used for adsorbing heavy metal ions in industrial sewage,and the specific surface area of the adsorption type bone apatite is increased from 47.832 (m<2>/g) to 131.566 (m<2>/g) compared with the specific surface area of the adsorption type bone apatite before modification; when the initial concentration of Pb<2> is 200 mg/L, a removal rate can reach 98.3%; for Zn<2> and Cu<2> ions with an initial concentration of 200 mg/L, the removal rate of the ions can reach 70% or above; so the adsorption type bone apatite has good heavy metal ion removal capacity. The technical problem that bone apatite in the prior art is not high enough in adsorption capacityis solved.

The invention discloses a five-section-type caustic calcined magnesite energy saving and environmental protection shaft kiln. The five-section-type caustic calcined magnesite energy saving and environmental protection shaft kiln is characterized in that the kiln is divided into five hot work area sections from top to bottom, and the five hot work area sections are a preheating decomposition zone,a calcination zone, a rear calcination zone, a heat insulation zone and a cooling separation zone sequentially; a balance air-exhaust demodulator 5 is arranged on the upper part in the kiln; a secondary combustion-supporting air distributor and a cooling separator are included; the preheating decomposition zone is located between the balance air-exhaust demodulator and a burner; and the rear calcination zone is located between the burner 7 at the lower part in the kiln and the secondary combustion-supporting air distributor 9, the heat insulation zone is located at the lower part of the rear calcination zone, and the cooling separation zone is located at the lower part of a kiln body. The five-section-type caustic calcined magnesite energy saving and environmental protection shaft kiln hasthe advantages that when passing through the calcination zone, preheated magnesite can be evenly calcinated, and the phenomena of deviant fire and deviant combustion are avoided. One of the outstanding characteristics of the five-section-type caustic calcined magnesite energy saving and environmental protection shaft kiln is the heat insulation zone, the heat insulation zone is arranged accordingto the sintering characteristic of the caustic calcined magnesite, undecomposed magnesium carbonate can be decomposed at the heat insulation zone, and the yield is further increased.

The invention relates to an MXene electromagnetic shielding fabric as well as a preparation method and application thereof. The method comprises the following steps of carrying out plasma pretreatment on a flexible fabric substrate, dipping in an MXene dispersion liquid, taking out, drying, and carrying out low-temperature annealing treatment under a CO2 condition. The electromagnetic shielding fabric has good flexibility, washing resistance and electromagnetic shielding characteristics.

The invention provides a high-efficiency energy-saving lime kiln which comprises a furnace body, a hearth, a main grate, side grates, an unloading system and an air supply system, wherein the periphery of the hearth is sequentially provided with a refractory brick layer and a molten iron slag-cement mixture layer, and coated with an iron sheet; the top of the furnace body is provided with a flue; the flue port is communicated with a deduster via a blower through a pipeline; the lower part of the hearth is provided with a discharge hopper; an unloading bin is arranged below the discharge hopper; and the upper part of the main grate is a conical structure. The grates can implement balanced and smooth unloading; the added wall-mounted fire bar increases the mounting height of the main grate bar, thereby increasing the effective calcination area of the hearth; the formed circular discharge channel can implement smoother lime discharge and uniform lime calcination, thereby achieving the goals of energy saving and consumption reduction; and the lime kiln is convenient for maintenance and friendly to the environment.

The invention provides a four-hearth shaft kiln for dolomite calcination and a dolomite calcination method thereof. A shaft kiln body comprises a kiln body shell and a refractory material. The shaft kiln body is provided with four kiln cylinders, the four kiln cylinders are encircled into a circle, and the four kiln cylinders are communicated with one another through connecting channels at the lower parts of respective calcination zones; a feeding bin is arranged in the center of the top of the shaft kiln body, a rotary distributing device and four feeding pipes are arranged at the bottom of the feeding bin, and the outlet ends of the four feeding pipes are located in the four kiln cylinders respectively. An exhaust cylinder, a compressed air nozzle and a fuel nozzle are further arranged at the top of each kiln cylinder; the bottom of each kiln cylinder is connected with a cooling fan, and a discharging mechanism is arranged at the bottommost portion of each kiln cylinder. According tothe four-hearth shaft kiln, kiln cylinder feeding and airflow reversing are controlled, heat is transferred to cold materials, the space utilization rate is high, the heat utilization rate is high, losses are small, calcination is uniform, the phenomena of overburning and underburning are avoided, the product quality is high, the investment cost is low, and the four-hearth shaft kiln is suitablefor large-scale industrial production and application.

The invention relates to a device and a process method for preparing light calcined magnesia through suspension calcination. The device comprises a raw material bin, a flash dryer, a raw material multistage preheating device, a suspension calcinator, a waste gas treatment device, a gas-material separation device, a product heat recovery device and a smoke exhaust device. The process method for preparing light calcined magnesia through suspension calcination comprises the steps that magnesite powder is dried; multi-stage preheating is conducted after the magnesite powder is dried; the preheatedmagnesite powder is calcined and subjected to heat preservation; and the material subjected to heat preservation enters a product heat recovery device to be cooled. The problems that existing light calcined magnesia calcining equipment is poor in waste heat recycling rate and uneven in product quality are solved, and energy consumption of the suspension calcining furnace can be remarkably reduced.

The invention provides a preparation method of high-purity calcium oxide. Calcium hydroxide is produced by using raw materials with extremely high calcium oxide content, the dispersity of calcium ionsis improved by using stearic acid and polyvinyl alcohol 124, and the crystal form and the particle size of the calcium ions are controlled so that calcium hydroxide solids are high in fineness and good in dispersity, and finally, calcium oxide with high purity and good dispersity is prepared through high-temperature calcination. Calcium hydroxide with good dispersity can be better and more uniformly calcined at high temperature so that the production efficiency is improved, the yield of waste gas CO2 is reduced, and the cost of subsequent treatment is reduced. The method is simple in process,safe, environmentally friendly and high in production efficiency, and the prepared calcium oxide product is high in purity and good in dispersity.

This invention relates to a method for producing cement thickening control enhancer for cement from phosphogypsum. The method comprises: mixing phosphogypsum with lime and limestone, pressing, calcining at 800-1000 deg.C to obtain a semi-product, and mixing with grinding aid to obtain the product. The method has such advantages as simple process, reasonable formula, and low cost. The cement thickening control enhancer can control the thickening time of cement, increase the strength of cement, increase the doping amounts of mixed materials in cement, decrease the consumption of cement clinker, save energy and resources, and increase profit.

The invention mainly relates to the technical field of ceramic glaze processing,and discloses an antibacterial wear-resistant transparent glaze. The glaze is prepared from 35-37 parts of feldspar,24-26 parts of dolomite,21-23 parts of talcum,20-22 parts of limestone,17-19 parts of phlogopite,4-6 parts of niobium pentoxide and 3-5 parts of anatase titanium dioxide. The antibacterial wear-resistanttransparent glaze is bright,transparent and light yellow in luster,has relatively good antibacterial property and wear resistance,can effectively avoid color changing and scratches of ceramic productsin the use process,keeps the ceramic products attractive,and prolongs the service life of the ceramic products. The phlogopite is crushed and added into a sodium carbonate solution,and the mixture isfrozen and then subjected to high-temperature calcination,so that combination of sodium carbonate and phlogopite particles is promoted,the alkali resistance and wear resistance of phlogopite are improved,the elasticity and the sliding property are reduced,then the transparent glaze can be tightly attached to ceramic,the sintering temperature after glazing is reduced,and a large amount of energy is saved.

The invention discloses a high-temperature calcining apparatus for preparing food-grade tricalcium phosphate. The high-temperature calcining apparatus comprises a calcining work chamber, calcining pipes and a shelving device. According to the invention, one ends of the calcining pipes are fixed to the inner wall of the calcining work chamber, the other ends of the calcining pipes are inclined towards movable plates, and altogether four calcining pipes are symmetrically arranged relative to the movable plates, so the calcining pipes in the structure of the apparatus can realize more uniform calcining of the movable plates; two shelving frames are arranged along the longitudinal direction of the calcining work chamber, the calcining work chamber is provided with sliding chutes correspondingto fixed sliding blocks, and the fixed sliding blocks are slidably connected with the sliding chutes, so the structure is simple and clear, and has high practicability; and the movable plates and movable rods are movably connected with the shelving frames, the movable rods are fixed to the lower end faces of the movable plates, and fixed protruding blocks are elastically connected with conveying belts through torsional springs and are movably connected with the movable rods, so the movable plates in the novel structure can be jacked up rhythmically, and better calcining effect is obtained.

The invention discloses a three-dimensional dynamic turn-back flow preheating, drying and calcining system. A first preheater is arranged on the side edge of a first elevator, a second preheater is arranged on the side edge of a second elevator, a first calcinator is arranged on the side edge of a third elevator, a second calcinator is arranged on the side edge of a fourth elevator, a first cooleris arranged on the side edge of a fifth elevator, a second cooler is arranged on the side edge of a sixth elevator, a feeding port of the first elevator is connected to a stock bin through an auger,a first high-temperature heating source is arranged on a middle machine body of the first calcinator, a second tail gas hot air outlet is formed in the rear end of the first calcinator, a second high-temperature heating source is arranged on a middle machine body of the second calcinator, and a third tail gas hot air outlet is formed in the rear end of the second calcinator. A three-dimensional inclined plate turn-back flowing process is adopted, so that the preheating, drying and calcining time of the materials can be ensured. Meanwhile, no power exists in the turn-back flow process, the natural flow process can guarantee uniform material calcination, the production cost is saved, and automatic production can be achieved.