CN212292841U - Equipment for producing lanthanum oxide by fluidized calcination - Google Patents
Equipment for producing lanthanum oxide by fluidized calcination Download PDFInfo
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- CN212292841U CN212292841U CN202020795523.0U CN202020795523U CN212292841U CN 212292841 U CN212292841 U CN 212292841U CN 202020795523 U CN202020795523 U CN 202020795523U CN 212292841 U CN212292841 U CN 212292841U
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Abstract
The utility model relates to a fluidized calcining lanthanum oxide production device, which comprises a feeding machine, a flash dryer, a dry material catcher, a bag filter, a preheater, a gas combustion furnace, a dynamic calcining furnace, a finished product catcher, a product conditioning processor, a draught fan and a pipeline system, wherein the feeding machine, the flash dryer, the dry material catcher, the bag filter and the draught fan are sequentially connected in a sealing way; the gas combustion furnace, the dynamic calcining furnace, the product catcher, the preheater and the flash dryer are sequentially connected in a closed manner; the dry material catcher and the bag filter are respectively connected with the preheater in a sealing way; the preheater is connected with the dynamic calciner; the product catcher is connected with a product conditioning processor. The equipment has a simple structure, and lanthanum oxide is produced in a fluidized state through the dynamic calcining furnace, so that the problems that the traditional static calcining process is overheated and underfired due to uneven radiation heating are avoided, the calcining time is short, the heating is even, the energy consumption is low, the product quality is stable, and the automatic control is easy to realize are solved.
Description
The technical field is as follows:
the utility model belongs to the technical field of rare earth material production, concretely relates to fluidization is calcined and is produced lanthanum oxide's equipment.
Background art:
lanthanum oxide is an important rare earth oxide, and is often used as an important raw material of industrial products such as optical glass, piezoelectric ceramics, fluorescent powder, catalysts and the like.
At present, lanthanum oxide is industrially produced by mainly taking lanthanum salts such as lanthanum carbonate, lanthanum oxalate and the like as production raw materials, and the lanthanum oxide is traditionally produced by adopting production equipment such as a pushed slab kiln, a roller kiln or a tunnel kiln and the like in a radiation heating and calcining process mode. The conventional process has a plurality of engineering technical problems. The material is in a static state in the kiln, is heated unevenly under the action of radiation heating, is easy to over-burn or under-burn, and has quality indexes such as product purity, granularity and the like which are difficult to guarantee, so that the defects of the main production process of the traditional lanthanum oxide calcination are overcome. The corresponding process equipment is also designed by matching with the conventional static calcination. Therefore, the search for a high-efficiency and energy-saving calcining device for producing lanthanum oxide becomes an important engineering technical key for improving the preparation level of lanthanum oxide.
The utility model has the following contents:
the utility model aims to overcome the defects of the prior art and provide equipment for producing lanthanum oxide by fluidization calcination. The equipment has simple structure, adopts the equipment to carry out fluidization calcination to produce lanthanum oxide, and has the advantages of uniform heating, short calcination time, low energy consumption, stable product quality, easy realization of automatic control and the like.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides an equipment of fluidization calcination production lanthanum oxide, includes feeder, flash dryer, dry material trap, bag filter, pre-heater, gas combustion furnace, dynamic calcining furnace, product trap, product quenching and tempering treater, draught fan and pipe-line system, wherein:
the feeder, the flash dryer, the dry material catcher, the bag filter and the induced draft fan are sequentially connected in a pipeline sealing way;
the gas combustion furnace, the dynamic calcining furnace, the product catcher, the preheater and the flash evaporation dryer are sequentially connected in a closed manner through pipelines;
the dry material catcher and the bag filter are respectively connected with the preheater in a sealing way through pipelines;
the preheater is also connected with the dynamic calciner in a closed way through a pipeline;
the product catcher is also connected with a product conditioning processor.
In the equipment for producing lanthanum oxide by fluidized calcination, a material discharge port of a feeder is connected with a material feed port of a flash dryer;
the air outlet of the gas combustion furnace is connected with the air inlet of the dynamic calcining furnace through a pipeline;
the air outlet of the dynamic calciner is connected with the air inlet of the product catcher through a pipeline; the air outlet of the product catcher is connected with the air inlet of the preheater through a pipeline; the air outlet of the preheater is connected with the air inlet of the flash dryer through a pipeline; the flash dryer carrier gas outlet is connected with the dry material catcher gas inlet through a pipeline; the air outlet of the dry material catcher is connected with the air inlet of the bag filter through a pipeline; the air outlet of the bag filter is connected with the air inlet of the induced draft fan;
the discharge port of the dry material catcher and the discharge port of the bag filter are respectively connected with an air inlet pipeline of the preheater through pipelines; the discharge hole of the preheater is connected with the feed hole of the dynamic calciner through a pipeline;
and the discharge hole of the product catcher is connected with the feed inlet of the product conditioning processor.
A material scattering device is arranged in the flash drying machine.
And a product heat-insulating tempering chamber is arranged in the product tempering processor.
And the product quenching and tempering products discharged by the product quenching and tempering processor are cooled by a product cooling system, packaged and warehoused.
The method for producing lanthanum oxide by fluidized calcination adopts the technical equipment, and comprises the following steps:
(1) sending the raw material of the lanthanum carbonate filter cake into a flash dryer through a feeder, scattering and drying until free moisture is removed, and obtaining dry lanthanum carbonate powder;
(2) collecting the dried lanthanum carbonate powder by a dried material catcher, sending the collected dried lanthanum carbonate powder into a preheater, preheating and removing part of crystal water to obtain preheated lanthanum carbonate powder;
(3) feeding the preheated lanthanum carbonate powder into a dynamic calcining furnace, and performing decomposition and calcination at 950-1100 ℃ to obtain calcined lanthanum oxide powder and carbon dioxide;
(4) and (3) conveying the lanthanum oxide powder into a product conditioning processor through a product catcher for heat preservation and conditioning, wherein the heat preservation temperature is 750-850 ℃, the time is 7-8 hours, obtaining the conditioned lanthanum oxide, cooling, packaging and warehousing.
In the step (1), the TREO of the lanthanum carbonate filter cake raw material is more than or equal to 49.2%, and the water content is less than or equal to 20%.
In the step (1), the drying temperature of the materials in the flash dryer is 300-450 ℃ so as to remove the free moisture of the materials.
In the step (2), the preheating temperature of the materials of the preheater is 500-850 ℃, so that the temperature of the lanthanum carbonate powder materials reaches 400-750 ℃, and 5-8 crystal water in the materials are decomposed.
In the step (2), after the dry lanthanum carbonate powder is trapped by the dry material trap, the separated gas is filtered by the bag filter to obtain the filtered lanthanum carbonate powder, and the filtered lanthanum carbonate powder is sent to a preheater to carry out the same preheating operation.
In the step (3), the calcination decomposition temperature of the material is 950-1100 ℃. Lanthanum carbonate decomposes into lanthanum oxide and carbon dioxide.
In the method for producing lanthanum oxide by calcination, materials exist in a fluidized state, namely the materials are heated by dilute phase current in heating gas, and the drying, preheating and calcination process treatment of the materials are sequentially, continuously and automatically completed from the raw materials to the products by the working procedures.
In the process of the method for producing lanthanum oxide by calcination, the heat required by material drying, preheating, decomposition and calcination is provided by high-temperature hot gas generated by a gas combustion furnace, and the method for producing lanthanum oxide by calcination comprises the following specific process flows:
(1) the combustion of combustion gas of the gas combustion furnace produces combustion flue gas, namely high-temperature hot gas enters the dynamic calcining furnace, so that the preheated materials in the furnace form a fluidized state, are mixed with the preheated materials and exchange heat, and the decomposition and calcination treatment of the materials are completed in the dynamic operation process;
(2) the dynamic calcining furnace discharges carrier gas, gas-solid separation is completed through the product catcher, calcining separation gas and calcining separation solid are obtained, wherein:
the calcining separation gas enters a preheater to enable the dried material to form a fluidized state, the fluidized state is mixed with the dried material and exchanges heat, the preheating treatment of the material is completed in the dynamic operation process, the preheated material is subjected to gas-solid separation to obtain preheating separation gas and preheating separation solid, and the preheating separation solid enters a dynamic calciner to be calcined;
calcining and separating solid, namely a calcined lanthanum oxide product, and sending the calcined lanthanum oxide product into a product conditioner for heat preservation and conditioning;
(3) preheating the separated gas to enter a flash evaporation dryer to enable the lanthanum carbonate raw material scattered in the flash evaporation dryer to form a fluidized state, mixing the fluidized state with the lanthanum carbonate raw material, exchanging heat, and realizing dehydration and drying treatment of the material in the dynamic operation process;
(4) the flow-carrying gas discharged from the flash dryer passes through a dry material catcher and a bag filter, and secondary gas-solid separation is carried out according to the sequence: the dried material collected by the dried material collector and the dried material obtained by filtering by the bag filter are respectively sent into a preheater for carrying out crystallization water removal and preheating treatment;
(5) the separated gas obtained by filtering the bag filter is purified by a gas purification system, and is led out by a draught fan and discharged in an environment-friendly way.
In the step (2), the dry lanthanum carbonate powder undergoes the following pyrolysis reaction in the preheater to remove part of the crystal water:
La2(CO3)3.xH2O→La2(CO3)3.x-nH2O+nH2O
in the step (3), the preheated lanthanum carbonate powder undergoes the following pyrolysis reaction in the dynamic calcining furnace:
La2(CO3)3.x-nH2O→La2O3+CO2+x-nH2O
the utility model has the advantages that:
the utility model discloses a fluidization is calcined production lanthanum oxide equipment and is collected the drying, preheat, calcine in an organic whole, adopts this equipment to avoid traditional static state calcination technology to lead to the overheated and the technical drawback of short burning of material because of the radiant heating inequality, has that the calcination time is short, makes the material in calcining the temperature, the instantaneous operation of accomplishing calcining, heats advantages such as even, the energy consumption is low, product quality is stable, easy realization automated control. The method specifically comprises the following steps:
(1) and after the dry powder material is fully mixed with hot gas in the furnace, the specific surface area of the material subjected to heat is maximum, and the material is heated in a very short time to complete the calcination decomposition process. The calcination temperature of the material is stable and has no gradient change, the material can not be over-burnt or under-burnt, and the quality of the calcined product is uniform and stable.
(2) A flash evaporation dryer is adopted for drying the lanthanum carbonate filter cake, the multistage rotating blades in the flash evaporation dryer can fully break up the filter cake material, and the filter cake material is mixed and heated under the action of hot air and wind power, so that the material drying treatment is dynamically realized. The materials are dried fully and quickly.
(3) On the basis of the whole equipment structure, the process flow adopts the combination of the working procedures of material calcination, preheating and drying to be applied in sequence, so that the heat energy is utilized in a stepped manner, and the heat efficiency of the system is improved to the maximum extent.
(4) And (4) quenching and tempering the calcined product by adopting a product quenching and tempering processor so as to quench and temper the product property and stabilize the product quality.
(5) And obtaining a high-quality lanthanum oxide powder product.
Description of the drawings:
FIG. 1 is a schematic structural view of an apparatus for producing lanthanum oxide by fluidized calcination according to embodiment 1 of the present invention; wherein:
the method comprises the following steps of 1-feeding machine, 2-rotary flash evaporation dryer, 3-dry material catcher, 4-bag filter, 5-cyclone preheater, 6-gas combustion furnace, 7-dynamic calciner, 8-product catcher, 9-product modifying processor and 10-induced draft fan.
The specific implementation mode is as follows:
the present invention will be described in further detail with reference to examples.
In the following examples:
lanthanum oxide raw material produced by Nemengda chemical company is used as lanthanum carbonate filter cake, the TREO lanthanum oxide content is 49.53%, the water content is 20%, and Cl is added-＝0.029％，SO4 2-＝0.028％，CaO＝0.015％。
The dynamic calcining furnace is SD30 type, and the flash dryer is SZ45 type.
Example 1
A pilot plant for producing lanthanum oxide by fluidized calcination has a system throughput of 160kg/h and a system temperature error controlled within a range of +/-5 ℃ of a set temperature. The structure of the device is shown in a schematic diagram 1, and the device comprises a feeder 1, a rotary flash evaporation dryer 2, a dry material catcher 3, a bag filter 4, a preheater 5, a gas combustion furnace 6, a dynamic calciner 7, a product catcher 8, a product conditioning processor 9, an induced draft fan 10, a pipeline system, an air purification system, a product cooling and packaging system and an automatic control system; wherein:
the material outlet of the feeder 1 is connected with the material inlet of the flash dryer 2; a combustion gas outlet of the gas combustion furnace 6 is connected with a gas inlet of the dynamic calcining furnace 7 through a pipeline; a carrier gas outlet of the dynamic calcining furnace 7 is connected with a gas inlet of the product catcher 8 through a pipeline; the gas outlet of the product catcher 8 is connected with the gas inlet of the preheater 5 through a pipeline; the gas outlet of the preheater 5 is connected with the gas inlet of the flash dryer 2 through a pipeline; a carrier gas outlet of the flash dryer 2 is connected with a gas inlet of the dry material catcher 8 through a pipeline; the gas outlet of the dry material catcher 8 is connected with the gas inlet of the bag filter 4 through a pipeline; a discharge port of the dry material catcher 8 and a discharge port of the bag filter 4 are connected with an air inlet pipeline of the preheater 5 through pipelines; a gas outlet of the bag filter 4 for filtering gas is connected with an air inlet of an induced draft fan 10, and tail gas discharged by the induced draft fan 10 passes through a gas purification system and is discharged in an environment-friendly way; the discharge hole of the product catcher 8 is connected with the feed inlet of the product conditioning processor.
The method for producing lanthanum oxide by fluidized calcination by adopting the equipment for producing lanthanum oxide by fluidized calcination comprises the following steps:
(1) taking the lanthanum carbonate filter cake, sending the lanthanum carbonate filter cake into a flash dryer 2 through a feeding machine 1, scattering and drying the lanthanum carbonate filter cake in the flash dryer 2 to obtain dry lanthanum carbonate powder subjected to flash drying treatment, wherein the drying temperature is 420 ℃, the drying heat is provided by preheated separation gas, and the lanthanum carbonate raw material scattered in the flash dryer is fluidized;
(2) collecting and collecting the flash-dried carrier gas-form dried lanthanum carbonate powder by a dry material collector 3, simultaneously obtaining a collector separated gas, filtering the collector separated gas by a bag filter 4 to collect a dry material, and sending the material collected by the dry material collector 3 and the dry material filtered and collected by the bag filter 4 into a preheater 5; the bag filter 4 filters and collects the dry materials, and the obtained separated gas (exhaust gas) is led out for purification and evacuation by the induced draft fan 10.
(1) the dried material is sent into a preheater 5 for preheating, the preheating heat is provided by calcining separation gas, the preheating temperature is 700 ℃, the dried material is fluidized, meanwhile, the temperature of the preheated lanthanum carbonate powder material reaches 520 ℃, and 5-8 crystal water is removed;
(2) and (3) gas-solid separation is carried out on the preheated material through a preheater 5 to obtain preheated separation gas and preheated separation solid, the separated preheated lanthanum carbonate powder material is sent into a dynamic calciner 7, and the preheated separation gas enters a flash evaporation drier to provide heat for drying.
(1) the gas enters a dynamic calciner 7, the material calcination decomposition temperature of the dynamic calciner 7 is 1000 ℃, and lanthanum carbonate powder is decomposed to obtain calcined lanthanum oxide;
(2) and (3) carrying out gas-solid separation on the calcined lanthanum oxide by a product catcher 8 to obtain calcined separation gas and calcined separation solid, and sending the calcined separation solid into a product conditioning processor 9 for thermal insulation conditioning treatment, wherein the thermal insulation temperature is 760 ℃ and the conditioning time is 7 hours. Obtaining a product lanthanum oxide, discharging, cooling, bagging and warehousing; the calcining separation gas enters a preheater to provide heat for preheating the dry materials.
The product lanthanum oxide has the following quality: TREO is more than or equal to 99.10 percent, Cl-＝0.055％，SO4 2-0.037 percent and 0.024 percent of CaO; the density was 1.2g/cm3Particle size D5020 μm, and the ignition loss is less than or equal to 1 percent. Through the quality analysis of the product, the product quality is the grade of the superior product of the enterprise.
Claims (4)
1. The utility model provides an equipment of fluidization calcination production lanthanum oxide, its characterized in that, includes feeder, flash dryer, dry material catcher, bag filter, pre-heater, gas combustion furnace, dynamic calcining furnace, finished product catcher, product quenching and tempering treater, draught fan and pipe-line system, wherein:
the feeder, the flash dryer, the dry material catcher, the bag filter and the induced draft fan are sequentially connected in a pipeline sealing way;
the gas combustion furnace, the dynamic calcining furnace, the product catcher, the preheater and the flash evaporation dryer are sequentially connected in a closed manner through pipelines;
the dry material catcher and the bag filter are respectively connected with the preheater in a sealing way through pipelines;
the preheater is also connected with the dynamic calciner in a closed way through a pipeline;
the product catcher is also connected with a product conditioning processor.
2. The apparatus for producing lanthana by fluidized calcination according to claim 1, characterized in that:
the material outlet of the feeder is connected with the material inlet of the flash dryer;
the air outlet of the gas combustion furnace is connected with the air inlet of the dynamic calcining furnace through a pipeline;
the air outlet of the dynamic calciner is connected with the air inlet of the product catcher through a pipeline; the air outlet of the product catcher is connected with the air inlet of the preheater through a pipeline; the air outlet of the preheater is connected with the air inlet of the flash dryer through a pipeline; the gas outlet of the flash dryer is connected with the gas inlet of the dry material catcher through a pipeline; the air outlet of the dry material catcher is connected with the air inlet of the bag filter through a pipeline; the air outlet of the bag filter is connected with the air inlet of the induced draft fan;
the discharge port of the dry material catcher and the discharge port of the bag filter are respectively connected with an air inlet pipeline of the preheater through pipelines; the discharge hole of the preheater is connected with the feed hole of the dynamic calciner through a pipeline;
and the discharge hole of the product catcher is connected with the feed inlet of the product conditioning processor.
3. The apparatus for producing lanthana by fluidized calcination according to claim 1, wherein a material scattering device is provided in the flash dryer.
4. The apparatus for producing lanthana by fluidized calcination according to claim 1, wherein a product heat-insulating conditioning chamber is provided in the product conditioning apparatus.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111453757A (en) * | 2020-05-14 | 2020-07-28 | 辽宁东大粉体工程技术有限公司 | Equipment and method for producing lanthanum oxide through fluidized calcination |
| CN113003600A (en) * | 2021-03-09 | 2021-06-22 | 淄博包钢灵芝稀土高科技股份有限公司 | Preparation method of rare earth oxide |
| CN115010164A (en) * | 2022-05-31 | 2022-09-06 | 张绪祎 | System and method for preparing cerium dioxide by dehydrating and burning wet cerium carbonate material |
-
2020
- 2020-05-14 CN CN202020795523.0U patent/CN212292841U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111453757A (en) * | 2020-05-14 | 2020-07-28 | 辽宁东大粉体工程技术有限公司 | Equipment and method for producing lanthanum oxide through fluidized calcination |
| CN113003600A (en) * | 2021-03-09 | 2021-06-22 | 淄博包钢灵芝稀土高科技股份有限公司 | Preparation method of rare earth oxide |
| CN115010164A (en) * | 2022-05-31 | 2022-09-06 | 张绪祎 | System and method for preparing cerium dioxide by dehydrating and burning wet cerium carbonate material |
| CN115010164B (en) * | 2022-05-31 | 2024-04-19 | 华清燚能(北京)科技有限公司 | System and method for preparing cerium dioxide by adopting cerium carbonate wet material through dehydration and burning |
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