39results about How to "Improve calcination quality" patented technology

A method for calcining titanium dioxide through an expansion drying technique comprises a feeding step and a calcining step, wherein a metatitanic acid material subjected to filter pressing and expansion drying and with the moisture content of 10-15% is conveyed into a rotary kiln to be calcined; the calcining in the rotary kiln is divided into three stages, each stage accounts for one third of the whole length of the rotary kiln, the temperature of the first stage is controlled to be 500-700 DEG C and the standing time is 1.5-2 hours, the temperature of the second stage is controlled to be 700-850 DEG C and the standing time is 1.5-2 hours, the temperature of the third stage is controlled to be 850-950 DEG C and the standing time is 2-2.5 hours. In the method for calcining the titanium dioxide, a heat source required for expansion drying can be provided by high temperature flue gas of the kiln tail of the rotary kiln, and the rotating speed of the rotary kiln is kept at 0.25-0.33 revolutions per minute. The calcining method provided by the invention can increase the productivity, decrease the energy consumption, and also improve the calcining quality of a product.

The invention relates to a feeding method and feeding equipment for a titanium dioxide calcination rotary kiln. The equipment comprises a membrane filter press (1), a belt conveyor (2), a first screw conveyor (3), a flash evaporation drying main machine (4), a second screw conveyor (5), a cyclone dust collector (6), the rotary kiln (7), a high pressure induced draft fan (14), an alkali liquor adsorption tower (10), an alkali liquor spraying pump (13), an alkali liquor storage tank (15) and a bag filter (12); a rotary blade (11) is arranged at the bottom of the flash evaporation drying main machine (4); and a first star-shaped discharge valve (8) and a second star-shaped discharge valve are respectively arranged at the bottoms of the flash evaporation drying main machine and the cyclone dust collector. The method adopting the feeding equipment comprises the steps of conveying, flash evaporation drying, recovery, collection and tail gas treatment. Metatitanic acid materials entering the flash evaporation drying main machine are in contact with high-temperature flue gas from the kiln tail of the rotary kiln; under the action of high speed rotation of the rotating blade at the bottom, the materials are crushed, dispersed and dried; and after flash evaporation drying, the materials with the moisture content of 10 to 15 percent enter the rotary kiln. Through the adoption of the feeding method and the feeding equipment disclosed by the invention, the productivity can be improved, energy consumption can be reduced and the calcination quality of products can also be improved.

The invention discloses a system for calcinating plaster and a calcinating method thereof. The system includes a crusher for crushing the plaster material, a plaster drying device for drying the crushed plaster material, an oscillating sieve for sieving the dried plaster material, a calcinatory of a fluid bed for calcinating the sieved plaster material, a storage tower for storing the calcinated plaster as well as a hot air boiler for providing a thermal source for the plaster drying device and the calcinatory of the fluid bed. By adopting the device which first dries and then calcinates in the invention greatly promotes the efficiency and improves the quality of calcinating; besides, by adopting the single storage tower to carry out cooling, the efficiency of the whole system is greatly improved; the crushing and sieving of the plaster material guarantees that the calcinatory of the fluid bed sufficiently calcinates the plaster material, thus facilitating the production quality.

The embodiment of the present invention provides a lime preparation device and a lime preparation method, including a heating device, a belt calciner and a cooling fan; The paving machine, and the screening and collecting mechanism arranged under the discharge end of the trolley; the trolley is divided into a preheating section, a calcination section and a cooling section in turn; the preheating section, the calcination section, and the cooling section There are gas hoods on the top and bellows on the bottom; pipe connections are provided on the top of each gas hood and the bottom of the bellows; the hot air outlet of the heating device is connected with the gas hood of the calcination section by pipelines; the cooling fan and the cooling The bellows are connected by pipes. The raw materials on the belt calciner are heated by the hot air with stable temperature and pressure supplied by the heating device, which shortens the lime calcination time, and because the belt calciner has a large amount of material, the production efficiency of the lime preparation process is greatly improved, which can be Significantly increase the stand-alone production capacity of lime preparation.

A phosphogypsum calcining furnace, belonging to the field of phosphogypsum calcining, comprising a flame-throwing furnace, an inner cylinder, a feed port, an outer cylinder, an outer cylinder pushing plate, an inner and outer cylinder connecting piece, an outer cylinder tail end, a cone, and an inner cylinder pushing plate , a pressure equalizing device, and a discharge port; the flame-injecting furnace is a coal-injection furnace or a gas-injecting furnace, installed at the discharge port of the inner cylinder, and its fire direction is located at the discharge end of the inner cylinder; the inner cylinder is arranged on the outer The inside of the cylinder is coaxial with the outer cylinder, and its outer wall is fixedly connected with the outer cylinder through the inner and outer cylinder connectors; the feed inlet is arranged on the outer cylinder, located at one end of the flame-breathing furnace, and runs through the wall thickness of the outer cylinder; The air flow is balanced, the material to be calcined is heated evenly, and the movement of the material to be calcined tends to be smooth, which improves the production efficiency and calcination quality.

The invention discloses a double-chamber kiln burning fuel with low calorific value, which includes a No. 1 kiln body and a No. 2 kiln body. The upper middle part of the No. 1 kiln body and the upper middle part of the No. 2 kiln body are jointly fixedly installed with a feeding device, and the upper right end of the No. 1 kiln body and the upper left end of the No. 1 kiln body are jointly fixedly connected with a preheating device. The lower part and the lower part of the left end of the No. 1 kiln body are jointly fixed with a cooling device. The double-chamber kiln for fuel with low calorific value described in the present invention can increase the combustion temperature of fuel with low calorific value through branch pipes, main pipes, combustion chambers and heat storage boxes, and optimize the calcination effect; and the cooling device can realize effective heat dissipation of materials Transformation and recycling further reduce energy consumption; the double-chamber kiln can realize the mutual switching between the two kiln bodies to complete the continuous production of materials; and the feeding device can make the double-chamber kiln unloading convenient and reduce the labor intensity of the staff.

The invention discloses an airflow desulphurization gypsum calcination system, which comprises a feeding storage system, a quantitative reclaiming system, a scattering machine, a post-calcination device, an electric dust collector, a modifying machine and a heat source stabilizing system, wherein the feeding storage system is used for delivering and temporarily storing the desulphurization gypsumraw materials; the quantitative reclaiming system is used for quantitatively measuring the desulphurization gypsum raw material which is conveyed by the feeding storage system and for sending the measured desulphurization gypsum raw material to the scattering machine; the scattering machine is used for scattering the desulphurization gypsum raw material of a given quantity which is sent by the quantitative reclaiming system to be dried and calcined in the high-temperature smoke; the electric dust collector is used for separating the desulphurization gypsum which is adequately burned from the smoke; the modifying machine is used for modifying the desulphurization gypsum after the calcinations which is separated from the electric dust collector and make the desulphurization gypsum into the building gypsum - a raw material which is suitable for the production of the gypsum board; and the heat source stabilizing system is used for supplying a stable heat source and for adequately utilizing the surplus heat of the system.