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

The invention relates to a lime kiln device with hot-air calcination and a method for producing lime by the utilization of the lime kiln device. When preparing lime, hot air generated from a combustion apparatus outside a kiln is used for calcination of limestone; waste hot air used after the calcination is used for preheating of the limestone mineral aggregate; the waste hot air used after preheating is discharged out of the kiln body, and then undergoes dedusting and finally used for preheating of coal gas and oxidizing air. Through the use of hot air for calcination of limestone, lime quality can be remarkably improved, lime yield is raised, and productivity is enhanced. The lime kiln proposed by the invention is not provided with a burner system, and the hot air for high temperature calcination is from a combustion furnace device outside the kiln. Blast-furnace gas can be used as a fuel for the combustion furnace device, and hot flue gas generated by the combustion device can be used as the hot air. Thereby, the kiln structure is simplified, and operating cost of the lime kiln is reduced.

A phosphogypsum calciner belongs to the field of phosphogypsum calcinations. The phosphogypsum calciner includes a fire spitting furnace, an inner cylinder, a material inlet, an outer cylinder, an outer cylinder material pushing plate, an inner and outer cylinder connecting piece, an outer cylinder tail end, a conical body, an inner cylinder material pushing plate, a pressure equalizing device anda material outlet; the fire spitting furnace is a coal spraying furnace or a gas-fired fire spraying furnace, and is mounted at the material outlet of the inner cylinder, and the fire spraying direction of the fire spitting furnace is locate at the material discharging end of the inner cylinder; the inner cylinder is arranged in the outer cylinder and is coaxial with the outer cylinder, and the outer wall of the inner cylinder is fixedly connected with the outer cylinder through the inner and outer cylinder connecting piece; and the material inlet is arranged in the outer cylinder, is locatedat one end of the fire spitting furnace, and penetrates through the wall thickness of the outer cylinder. The phosphogypsum calciner has the characteristics of keeping of the balance of airflow in the inner cylinder, uniformity in heating of the calcined material, realization of movement of the calcined material tending to be smooth, and improvement of the production efficiency and the calcination quality.

The invention discloses a process for producing molybdenum trioxide through spiral flow fluidized calcination. The process mainly comprises the following steps of: preheating molybdenum concentrate to make the materials in a gas-solid mixed state; conveying the preheat molybdenum concentrate to a fluidized rotary calciner to make the gas-solid mixed ratio in the calciner to be 40: 0.5-1 and temperature to be 50 to 800 DEG C; allowing the calcined smoke to enter an air-cooled heat exchanger to cool the smoke to below 300 DEG C; and collecting dust by using a cloth bag to perform gas-solid separation to recycle the calcined sand. Due to the process, the molybdenum metal grade reaches over 60 percent and the recovery rate reaches 99.5 percent after the molybdenum concentrate is calcined. Compared with the convention calcination, the process has more complete oxidation so as to be beneficial for producing molybdate and improve leaching rate and recovery rate. The process is performed in a fully-sealed system and has the advantages of high recovery rate, environmental friendliness, convenient automatic control, simpliness, little time consumption, low energy consumption, good calcining quality, improvement on production efficiency and reduction in labor intensity of operators.

The invention discloses an industrial calcination shaft kiln. According to the industrial calcination shaft kiln, gas, liquid or power are taken as fuel, the calcination temperature is more even, theproduct quality is better, energy conservation and environmental protection are achieved, the automation degree is high, and massive or granular or ball-shaped materials can be calcined. The industrial calcination shaft kiln comprises a cylinder body, a material adding device used for adding materials to the interior of the cylinder body and an exhaust device used for exhausting tail gas are arranged on the upper portion of the cylinder body; a combustion-supporting wind device used for sending combustion-supporting wind to the interior of the cylinder body and an unloading device used for discharging the material in the cylinder body are arranged on the lower portion of the cylinder body, at least a sudden-changed section is arranged at the position, between the material adding device andthe combustion-supporting wind device, of the cylinder body, the size of the part, on the upper portion of the sudden-changed section, of an inner cavity of the cylinder body is small in the horizontal direction, the size of the part, on the lower portion of the sudden-changed section, of the inner cavity of the cylinder body is large in the horizontal direction, and when the materials flow downwards in the cylinder body, a cavity which the materials cannot reach naturally is formed on the lower portion of the sudden-changed section; and an outlet of a combustion nozzle in a fuel combustion device communicates with the cavity, and materials are sprayed out from the combustion nozzle.

The invention discloses a pot-type calcining furnace. The pot-type calcining furnace consists of two calcining pots which are vertically arranged right and left, a combustion chamber, heating fire ways, air ways, volatilizing subways, a flue, feeding systems and discharging systems, wherein the heating fire ways are arranged on the front sides and the back sides of the calcining pots; inlets of the heating fire ways are connected with the combustion chamber, and outlets of the heating fire ways are communicated with the flue; the volatilizing subways are arranged on the peripheries of the heating fire ways; inlets of the volatilizing subways are connected with volatile discharging ports which are formed on the upper parts of the calcining pots, and outlets of the volatilizing subways are communicated with the heating fire ways; and the air ways are arranged below the heating fire ways and are communicated with the volatilizing subways. The pot-type calcining furnace is simple in structure; volatiles decomposed from raw materials are discharged from the discharging ports on the upper parts of the calcining pots, are mixed with air and pre-heated by the heating fire ways, enter the heating fire ways, and are fully combusted and utilized; the heat efficiency of the whole pot-type calcining furnace is high; the production continuity is high; and the production efficiency is high.

The invention discloses a novel double-hearth kiln for combustion of low-calorific-value fuel, which comprises a feeding device, a first kiln body and a second kiln body, wherein the feeding device isrespectively connected with the first kiln body and the second kiln body; the first kiln body comprises a first preheating device, a first calcining device, a first cooling device and a first discharging device from top to bottom; the second kiln body comprises a second preheating device, a second calcining device, a second cooling device and a second discharging device from top to bottom; the first kiln body and the second kiln body are connected through a fixed connecting device. According to the novel double-hearth kiln for combustion of low-calorific-value fuel, the combustion temperatureof the low-calorific-value fuel can be increased through the branch pipes, the main pipe, the combustion chamber and the heat storage box, and the calcination effect is optimized; meanwhile, the cooling device can realize effective conversion and recovery of material heat, so that the energy consumption is further reduced; the double-hearth kiln can achieve mutual switching between the two kiln bodies, and continuous production of materials is completed; finally, the feeding device can enable the double-hearth kiln to discharge materials conveniently, so that the labor intensity of workers isreduced.

The invention discloses a production method of activated aluminum oxide micropowder and relates to the field of materials. In the production method, a tunnel kiln sintering method is adopted to produce alpha-aluminum oxide micropowder; a green brick is uniform in drying and small in deformation degree; in addition, green brick movement links are relatively small, the broken brick rate is low, andthe conditions are beneficial to keeping good working condition of a tunnel kiln and also ensuring good calcining quality; and the prepared activated aluminum oxide micropowder can be used for a lighttransmitting aluminum oxide sintered body, a carrier for a phosphor, a single crystal material, a high-grade porcelain, an artificial bone, a semiconductor, an integrated circuit substrate, an audiotape filler, a catalyst and a carrier thereof, an abrasive material, a laser material, a cutting tool and the like and particularly plays an important role in development of microelectronics and material industry. The production method has the advantages of simpleness in operation, obvious effect and the like and is suitable for large-scale popularization and application.

The embodiment of the invention provides a lime kiln and a lime preparation method. The lime kiln comprises a lime kiln body and one or more heat carrier heating devices arranged outside the kiln body; the heat carrier heating device comprises a fuel gas input port, an air input port and a heat carrier output port; the kiln body is connected with the heat carrier output port through a heat carrier conveying pipeline; and a high-temperature-resistant lining is laid on the inner wall of the heat carrier conveying pipeline. When the device is used for preparing lime, no combustion flame exists in the kiln, but the heat carrier heating device is used for providing hot flue gas for the lime kiln so as to heat raw materials in the kiln, so that the temperature and the pressure of heat carrier gas can be accurately controlled, the temperature and the pressure in the lime kiln are stable, and the calcining efficiency is improved.

The invention relates to light calcined magnesia production, in particular to a device for preparing light calcined magnesia and collecting carbon dioxide. A feeding machine of the device is connectedwith a flash dryer, the flash dryer is respectively communicated with a multi-stage preheating cyclone device and a bag-type dust collector through pipelines, and the multi-stage preheating cyclone device is sequentially connected with a jet pulse type entrained-flow bed calcining furnace and a multi-stage recovery cyclone device; a gas circuit of the multi-stage recovery cyclone device is communicated with the multi-stage preheating cyclone device; a material path of the multi-stage recovery cyclone device is connected with the transition material bin, the transition material bin is connected with the gas-material mixing chamber, the bag-type dust collector is connected with the dehumidifying device, carbon dioxide gas enters the heat accumulating type hot blast stove through the three-fluid heat exchanger, and the three-fluid heat exchanger is communicated with the heat accumulating type hot blast stove and is connected with the jet flow pulse type entrained-flow bed calcining furnace through the temperature adjusting chamber. Waste heat of generated CO2 gas and combustion flue gas is utilized reasonably, heat is provided for a preheating and drying device, the CO2 gas and combustion air, and energy consumption is greatly reduced.

The invention discloses a method for stably controlling the content of C3A in clinker in a road getting out of a kiln. The method comprises the following steps: reducing material mixing on a material flat bin; washing the clinker in the road, and drying after washing for reducing the mud content; additionally arranging a wind pipe on a material stirring site to ensure smooth discharging of materials and improve calcination quality; and adjusting the mixture ratio of the clinker in the road, wherein the clinker in the road comprises the following components in parts by weight: 2.5 parts of C3A, 50.20 parts of CaO, 1.27 parts of MgO, 13.1 parts of SiO2, 2.37 parts of Al2O3 and 3.35 parts of Fe2O3. According to the method for stably controlling the content of C3A in the clinker in the road getting out of the kiln, disclosed by the invention, the defects of large mud content, unstable quality, unreasonable mixture ratio and the like in the prior art can be overcome, and the advantages of large mud content, stable quality and reasonable mixture ratio are further realized.

The carbon furnace has several alternately arranged combustion channels and calcination channels inside the furnace body; burner below the body with mouth communicated with the first layer of combustion channels via shutter; volatile component recovering channel inside the body connected to all the combustion channels; and air preheating channel communicated via air regulating board to the first layer of combustion channels. Normally, the carbon furnace may be closed to utilize the recovered volatile component as fuel for maintaining production. It has the advantags of homogeneous calcination temperature, saving in fuel, high yield and quality of product.

The invention discloses a process for stably controlling C3A content in road clinker taking out of a kiln. The process comprises the following steps: when materials are spread, reducing material mixing; cleaning the road clinker, drying after cleaning, and reducing silt content; additionally arranging an air duct in the material poking field, ensuring that the materials are fed smoothly, and improving the calcining quality; adjusting the ratio of the road clinker, wherein the road clinker comprises the following constituents in parts by weight after adjustment: 2.8 parts of C3A, 50.18 parts of CaO, 1.15 parts of MgO, 13.3 parts of SiO2, 2.8 parts of Al2O3, and 3.4 parts of Fe2O3. The process for stably controlling the C3A content road clinker taking out of the kiln, disclosed by the invention, can overcome the defects of high silt content, unstable quality and unreasonable ratio in the prior art, so as to achieve the advantages of low silt content, stable quality and reasonable ratio.

The invention provides a method and device for controlling negative pressure in calcining furnace, and calcining furnace.The method comprises the steps that a pressure value at an outlet of the calcining furnace is collected; the opening degree of an outlet gate plate of the calcining furnace is adjusted according to the pressure value so as to adjust a negative pressure value in the calcining furnace to a preset negative pressure threshold. According to the method, the negative pressure in the calcining furnace can be adjusted to the suitable negative pressure threshold in real time, materialspraying is avoided, and meanwhile the calcination quality is improved.

The invention discloses a novel feeding device for a decomposing furnace for a cement kiln. The novel feeding device comprises an area I, an area II, an area III and an area IV, wherein the area I comprises a blanking pipe with the round top and the square bottom, and the blanking pipe is arranged obliquely; the area II is positioned below the feeding port of the area I, the area III is positionedunder the area II, and the area III and the area II are positioned on the oblique plane with the same gradient; and the area IV is connected to the bottom end of the area III and comprises a materialscattering plate which is tilted downwards. The novel feeding device for the decomposing furnace enhances the dispersion of materials to ensure the effective mixing of the materials with the rising high-temperature airflow in the decomposing furnace, so that all the materials are taken to a 5-stage preheater and deposited into the kiln. Thus, raw materials can be fully and uniformly decomposed, which is conducive to the calcination quality and an energy saving effect.

The invention discloses a calcination container and method, and relates to the technical field of calcination. The calcination container comprises a flange, at least two air inlet passages and a vessel body, wherein the flange is provided with at least two air inlets; the air inlet passages and the air inlets are connected in one-to-one correspondence for introducing gas; the container body is used for performing calcination and comprises a large quartz tube and at least two small quartz tubes, wherein the small quartz tubes are located in the large quartz tube, and the small quartz tubes arein one-to-one correspondence with the air inlets. The calcination container has the advantages that two samples can be separately placed in the small quartz glass tubes, so that the samples cannot bemixed with each other during experiments and operation; different atmospheres are introduced through the two air inlets of the flange respectively to meet different reaction conditions required for the experiments; the flow rate of the gas in different air inlets can be controlled respectively, and the ratio of the amount of two substances can be adjusted by adjusting the flow rate; the placementpositions of the samples and the temperature zone position of the reaction between the two samples can be controlled by designing the length of different small quartz tubes.

The invention discloses a stable control method of a C3A content in drawn road clinker. The stable control method comprises the steps of reducing a mixed material on a flat material warehouse, cleaning road clinker, then drying to reduce a silt content, additionally arranging an air pipe on a poking site to ensure smooth material blanking and improve roasting quality, and adjusting a matching ratio of ingredients of the road clinker to be as follows (in parts by weight): 2.6 parts of C3A, 50.26 parts of CaO, 1.24 parts of MgO, 12.21 parts of SiO2, 2.34 parts of Al2O3, and 3.23 parts of Fe2O3. The stable control method of the C3A content in the drawn road clinker can overcome defects such as a high silt content, unstable quality and the unreasonable matching ratio in the prior art to achieve the advantages of low silt content, stable quality and reasonable matching ratio.