Method for recovering elemental phosphorus by mud phosphorus distillation
阅读说明：本技术 一种泥磷蒸馏回收单质磷方法 (Method for recovering elemental phosphorus by mud phosphorus distillation ) 是由 岳峰 岳凡迪 于 2020-07-20 设计创作，主要内容包括：本发明公开了一种泥磷蒸馏回收单质磷方法,涉及泥磷处理技术领域。本发明包括以下步骤：将待回收的泥磷输送至泥磷槽内,然后通过水泵将热水槽内的热水抽入泥磷槽内,使得泥磷槽内的泥磷变成糊状；通过泥磷泵将泥磷槽内的泥磷抽入至泥磷处理机上方的泥磷料斗内,然后通过泥磷料斗内的螺旋机将泥磷输送至泥磷处理机内。本发明工艺技术突出高效、环保、安全、热能利用率高、可连续生产的特点,生产过程火焰不外串、尾气有序排放并设置有变温吸附和除尘设备,排出的干灰无单质磷,水循环使用不外排,作业环境良好,生产过程实现连续进料和连续出灰,提高了蒸磷效率,热源采用磷炉尾气,高温烟气实现系统循环利用,装置能够24小时不间断生产。(The invention discloses a method for recovering elemental phosphorus by distilling phosphorus sludge, and relates to the technical field of phosphorus sludge treatment. The invention comprises the following steps: conveying the phosphorus sludge to be recovered into a phosphorus sludge groove, and pumping hot water in a hot water groove into the phosphorus sludge groove through a water pump to enable the phosphorus sludge in the phosphorus sludge groove to become pasty; and pumping the phosphorus sludge in the phosphorus sludge groove into a phosphorus sludge hopper above the phosphorus sludge treatment machine through a phosphorus sludge pump, and conveying the phosphorus sludge into the phosphorus sludge treatment machine through a screw conveyor in the phosphorus sludge hopper. The process technology of the invention has the characteristics of high efficiency, environmental protection, safety, high heat energy utilization rate and continuous production, flames do not cross outside in the production process, tail gas is orderly discharged, temperature swing adsorption and dust removal equipment is arranged, discharged dry ash does not contain elemental phosphorus, water is recycled and is not discharged, the operation environment is good, continuous feeding and continuous ash discharge are realized in the production process, the phosphorus steaming efficiency is improved, the heat source adopts phosphorus furnace tail gas, high-temperature flue gas is systematically recycled, and the device can realize 24-hour continuous production.)
1. A method for recovering elemental phosphorus by mud phosphorus distillation is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: conveying the phosphorus sludge to be recovered into a phosphorus sludge groove (1), and pumping hot water in a hot water groove (20) into the phosphorus sludge groove (1) through a water pump to enable the phosphorus sludge in the phosphorus sludge groove (1) to become pasty;
step two: pumping the phosphorus sludge in the phosphorus sludge groove (1) into a phosphorus sludge hopper (3) above a phosphorus sludge treatment machine (5) through a phosphorus sludge pump (2), and then conveying the phosphorus sludge into the phosphorus sludge treatment machine (5) through a screw conveyor (4) in the phosphorus sludge hopper (3);
step three: starting a driving mechanism of the phosphorus sludge treatment machine (5), wherein a speed regulating motor (21) drives a main shaft scraper to rotate at the moment, and the scraper uniformly stirs phosphorus sludge fixed on a plurality of layers of heating plates in the machine;
step four: coal materials are introduced into the mud phosphorus treatment machine (5) through a coal burning port to be burnt, a distillation pot in the mud phosphorus treatment machine (5) is heated, meanwhile, phosphorus furnace tail gas is purified by a first water seal tank (6) and then is mixed with hot air after heat exchange, and the mixture is sent into the mud phosphorus treatment machine (5) to be burnt outside the distillation pot of the mud phosphorus treatment machine (5) in an auxiliary mode, the distillation pot in the mud phosphorus treatment machine (5) is heated in an auxiliary mode, and the mud phosphorus treatment machine (5) is heated uniformly under the heating of the coal materials, the phosphorus furnace tail gas and the hot air to be heated;
step five: in the heating and heat preservation process, phosphorus in the phosphorus sludge on the heating plate of the phosphorus sludge treatment machine (5) is evaporated and escaped, and enters the spraying disc (8) along the anti-blocking screw (7), water in the spraying disc (8) is obtained by pumping water in the spraying water tank (9) into the spraying water tank through the spraying pump (10), and the phosphorus steam is subjected to rapid heat exchange and cooling treatment through the spraying system in the spraying disc (8);
step six: the cooled phosphorus vapor is converged by a collecting pipe, enters a phosphorus collecting tank (11) to be collected and stored, elemental phosphorus in the phosphorus collecting tank (11) is pumped to the next process to be refined under the action of a phosphorus pumping pump (12), water in the phosphorus collecting tank (11) enters a spraying water tank (9) again after being filtered by a filter screen, so that the recycling of the spraying water is realized, the gas at the outlet of a processor escaping from the phosphorus collecting tank (11) enters a second water seal tank (13) through a pipeline to be purified, and then enters a waste gas processor (14) to be purified together with tail gas generated by combustion of a sludge phosphorus processor (5);
step seven: in the heating and heat preservation process, tail gas generated by combustion of the sludge phosphorus treatment machine (5) is discharged from a tail gas pipe on the side surface of the upper end of the sludge phosphorus treatment machine (5) into a heat exchanger (18) under the action of a hot air fan (19), the tail gas subjected to temperature reduction enters an exhaust gas treatment machine (14) along a pipeline to be purified after heat exchange with external cold air, the purified tail gas enters a third water seal tank (16) under the action of a tail gas fan (15) and then is discharged, the heat-exchanged external cold air is changed into hot air and then is conveyed to a phosphorus furnace along the pipeline to be mixed with the tail gas, and heat is provided for the sludge phosphorus treatment machine (5) together.
2. The method for distilling and recovering the elemental phosphorus from the phosphorus sludge as claimed in claim 1, wherein the hot water in the hot water tank (20) in the first step flows into the phosphorus sludge tank (1), the phosphorus sludge hopper (3) and the phosphorus collection tank (11) through hot water pipelines, and the phosphorus sludge tank (1), the phosphorus sludge hopper (3), the phosphorus sludge treatment machine (5) and the phosphorus collection tank (11) are dredged and cleaned regularly through the hot water.
3. The method for distilling and recovering the elemental phosphorus from the phosphorus sludge as claimed in claim 1, wherein in the second step, the phosphorus sludge in the phosphorus sludge tank (1) is pumped into a phosphorus sludge hopper (3) above the phosphorus sludge treatment machine (5) through a phosphorus sludge pump (2), the phosphorus sludge in the phosphorus sludge tank (1) is detected through a pH meter, and if the phosphorus sludge is too acid, the alkaline neutralization method is adopted to adjust the meta-acid phosphorus sludge, so that the pH value of the phosphorus sludge entering the phosphorus sludge treatment machine (5) is about neutral.
4. The method for distilling and recovering the elemental phosphorus from the phosphorus sludge as claimed in claim 1, wherein the oxygen content of the tail gas of the phosphorus furnace purified by the first water seal box (6) in the fourth step is less than 0.5%.
5. The method for distilling and recovering the elemental phosphorus from the phosphorus sludge as claimed in claim 1, wherein the heating and heat preservation process in the phosphorus sludge treatment machine (5) is provided with two stages, the first stage is to heat the distillation pot in the phosphorus sludge treatment machine (5) to 100 ℃, keep the temperature for half an hour to evaporate water in the phosphorus sludge, and the second stage is to heat the distillation pot in the phosphorus sludge treatment machine (5) to about 450 ℃, keep the temperature for 7 hours to completely sublimate phosphorus in the phosphorus sludge into phosphorus vapor.
6. The method for recovering the elemental phosphorus by distillation of the phosphorus sludge as claimed in claim 1, wherein the dry ash of the waste residue left in the distillation pot in the phosphorus sludge treatment machine (5) is discharged out of the phosphorus sludge treatment machine (5) through a screw conveyor (17).
7. The method for distilling and recovering the elemental phosphorus from the phosphorus sludge as claimed in claim 1, wherein the rotation speed of the main shaft in the phosphorus sludge treatment machine (5) is set to be 5 rpm.
8. The method for recovering the elemental phosphorus through the phosphorus slime distillation according to claim 1, wherein the treatment process of the waste gas treatment machine (14) in the sixth step adopts a mode of combining water washing with an activated carbon adsorption filtration technology process, and the phosphorus slime is orderly discharged after reaching the national allowable discharge concentration.
Technical Field
The invention belongs to the technical field of sludge phosphorus treatment, and particularly relates to a method for recovering elemental phosphorus by sludge phosphorus distillation.
Background
The process of producing yellow phosphorus by an electric heating method can generate sludge phosphorus, the sludge phosphorus accounts for 7-15% of the yellow phosphorus, the sludge phosphorus contains about 20-45% of phosphorus simple substance, the sludge phosphorus is generally called sludge phosphorus, the content of the simple substance phosphorus in the sludge phosphorus is 20-70%, the recovery of the simple substance phosphorus in the sludge phosphorus is an important thing which needs to be done by yellow phosphorus production plants, and the treatment method of the sludge phosphorus comprises a chemical method, a physical method and a method for preparing phosphoric acid or phosphate salt by the sludge phosphorus.
Recovering phosphorus from phosphorus sludge by a chemical method: the chemical method adopts the hydration of elemental phosphorus in the strong acid phosphorus oxide mud to generate the phosphoric acid, the waste liquid and the waste residue need to be subjected to secondary treatment, the pollution is eliminated, and the method cannot be widely applied to the present day because the method has long process route, the waste liquid and the waste residue need to be subjected to secondary treatment, the operation cost is high and the like.
Preparing phosphoric acid or phosphate from sludge phosphorus: the method is divided into a fixed furnace method and a rotary furnace method, the two methods adopt air to atomize, oxidize, absorb and hydrate the elemental phosphorus in the phosphorus sludge to generate the phosphoric acid, the method has harsh reaction conditions, is accompanied by side reactions, has complex process, great potential safety hazard and the like, and is rarely adopted by yellow phosphorus production plants at home and abroad.
Recovering simple substance phosphorus from the sludge phosphorus by a physical method: the physical method for recovering the simple substance phosphorus from the mud phosphorus is divided into a filtering method and a distillation method, wherein the filtering method adopts a filtering equipment filter screen or a filter screen attached with diatomite and filters out the simple substance phosphorus at a certain temperature and pressure; the distillation method adopts a rotary pot or a fixed pot to intermittently heat phosphorus sludge, evaporates phosphorus steam at a certain temperature and pressure, condenses the phosphorus steam to collect elemental phosphorus, and intermittently discharges dry ash, can realize intermittent feeding and continuous feeding at present, but cannot continuously discharge the dry ash, is one of the main domestic methods for recovering the elemental phosphorus sludge, but has the reasons of serious environmental pollution, great potential safety hazard, high comprehensive energy consumption of products, incapability of continuously discharging the dry ash and the like in the phosphorus sludge evaporation process.
Disclosure of Invention
The invention aims to provide a method for recovering elemental phosphorus by distillation of phosphorus sludge, which has the characteristics of high efficiency, environmental protection, safety, high heat energy utilization rate and continuous production, flames are not connected outside in the production process, tail gas is orderly discharged and temperature swing adsorption and dust removal equipment is arranged, the discharged dry ash has no elemental phosphorus, water is recycled and is not discharged, the operation environment is good, continuous feeding and continuous ash discharge are realized in the production process, the phosphorus steaming efficiency is improved, a yellow phosphorus furnace tail gas is used as a heat source, high-temperature flue gas is recycled systematically, the device can feed materials continuously for 24 hours and produce continuously, and the problems that the conventional process for recovering elemental phosphorus by treating phosphorus sludge in a rotary pot is difficult to produce continuously, the safety and the environmental protection are insufficient, and the recovery rate is low are solved.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the invention relates to a method for recovering elemental phosphorus by distilling phosphorus sludge, which comprises the following steps:
the method comprises the following steps: conveying the phosphorus sludge to be recovered into a phosphorus sludge groove, and pumping hot water in a hot water groove into the phosphorus sludge groove through a water pump to enable the phosphorus sludge in the phosphorus sludge groove to become pasty;
step two: pumping the phosphorus sludge in the phosphorus sludge groove into a phosphorus sludge hopper above the phosphorus sludge treatment machine through a phosphorus sludge pump, and conveying the phosphorus sludge into the phosphorus sludge treatment machine through a screw conveyor in the phosphorus sludge hopper;
step three: starting a driving mechanism of the phosphorus sludge treatment machine, driving a main shaft scraper to rotate by a speed regulating motor, and uniformly stirring phosphorus sludge fixed on a multilayer heating plate in the machine by the scraper;
step four: introducing a coal material into the phosphorus sludge treatment machine through a coal burning port for combustion, heating a distillation pot in the phosphorus sludge treatment machine, purifying phosphorus furnace tail gas by a first water seal box, mixing the purified phosphorus furnace tail gas with hot air after heat exchange, and feeding the mixture into the phosphorus sludge treatment machine to assist the combustion of the coal material outside the distillation pot of the phosphorus sludge treatment machine and assist the heating of the distillation pot in the phosphorus sludge treatment machine, wherein the phosphorus sludge treatment machine is uniformly heated and heated under the heating of the coal material, the phosphorus furnace tail gas and the hot air;
step five: in the heating and heat preservation process, phosphorus in the phosphorus sludge on the heating plate of the phosphorus sludge treatment machine is evaporated and escaped, and enters the spraying disc along the anti-blocking screw, water flow in the spraying disc is obtained by pumping water in the spraying water tank into the spraying disc through the spraying pump, and the phosphorus steam is subjected to rapid heat exchange and cooling treatment through the spraying system in the spraying disc;
step six: the cooled phosphorus vapor is converged by a collecting pipe and then enters a phosphorus collecting tank to be collected and stored, elemental phosphorus in the phosphorus collecting tank is pumped into the next process to be refined under the action of a phosphorus pumping pump, water in the phosphorus collecting tank enters a spraying water tank again after being filtered by a filter screen, so that the recycling of the spraying water is realized, the outlet gas of a processor escaping from the phosphorus collecting tank enters a second water seal tank through a pipeline to be purified, and then enters a waste gas processor to be purified together with tail gas generated by combustion of a sludge phosphorus processor;
step seven: in the heating and heat preservation process, tail gas generated by combustion of the sludge phosphorus treatment machine is discharged from a tail gas pipe on the side face of the upper end of the sludge phosphorus treatment machine into the heat exchanger under the action of the hot air fan, and after heat exchange with external cold air, the cooled tail gas enters the waste gas treatment machine along a pipeline to be purified, and the purified tail gas enters the third water seal tank under the action of the tail gas fan and then is discharged, and after the heat-exchanged external cold air is changed into hot air, the hot air is conveyed to the phosphorus furnace along the pipeline to be mixed with the tail gas, so that heat is provided for the sludge phosphorus treatment machine together.
Furthermore, hot water in the hot water tank in the first step flows into the phosphorus sludge tank, the phosphorus sludge hopper and the phosphorus collecting tank through hot water pipelines respectively, and the phosphorus sludge tank, the phosphorus sludge hopper, the phosphorus sludge treatment machine and the phosphorus collecting tank are dredged and cleaned at regular time through the hot water.
Further, in the second step, the phosphorus sludge in the phosphorus sludge groove is pumped into a phosphorus sludge hopper above the phosphorus sludge treatment machine through a phosphorus sludge pump, the phosphorus sludge in the phosphorus sludge groove is detected through a pH meter, and if the phosphorus sludge is too acid, the acid sludge is adjusted by adopting an alkali neutralization method, so that the pH value of the phosphorus sludge entering the phosphorus sludge treatment machine is about neutral, the problem that the pH value of the traditional phosphorus sludge is too acid, combustible gases of PH3 and H2 can be generated in production, and the phosphorus sludge can explode seriously is solved.
Furthermore, the oxygen content of the phosphorus furnace tail gas purified by the first water seal tank in the fourth step is less than 0.5%, so that the phosphorus furnace tail gas is prevented from being ignited to explode and cause safety accidents.
Furthermore, the heating and heat preservation process in the phosphorus sludge treatment machine is provided with two stages, the first stage heats a distillation pot in the phosphorus sludge treatment machine to 100 ℃, the temperature is preserved for half an hour, water in phosphorus sludge is evaporated, the second stage heats the distillation pot in the phosphorus sludge treatment machine to about 450 ℃, the temperature is preserved for 7 hours, and phosphorus in the phosphorus sludge is completely sublimated into phosphorus vapor.
Furthermore, the residual dry waste ash in the distillation pot in the sludge phosphorus treatment machine is discharged out of the sludge phosphorus treatment machine through a screw conveyor, the feeding and ash discharging designs of the sludge phosphorus treatment machine are all carried out through the screw conveyor, the potential safety hazards caused by the fact that atmospheric air enters the sludge phosphorus treatment machine are prevented, and the discharged dry waste ash is black-grey powder and does not contain elemental phosphorus.
Further, the rotation speed of the main shaft in the sludge phosphorus treatment machine is set to be 5 revolutions per minute.
Furthermore, the treatment process of the waste gas treatment machine in the sixth step adopts a mode of combining water washing with an activated carbon adsorption filtration technology process, and the waste gas is orderly discharged after the national allowable discharge concentration is reached.
The invention has the following beneficial effects:
the invention has the advantages that by arranging the phosphorus sludge treatment machine, the anti-blocking screw and the spraying disc, flames are not mixed outside in the production process, tail gas is orderly discharged, the quick spraying cooling system and the dust removing equipment are arranged, spraying water is recycled without being discharged outside, the operation environment is good, phosphorus steam is evaporated by heat exchange at a certain temperature, phosphorus in the phosphorus sludge can escape to the maximum extent, meanwhile, dry ash can be smoothly discharged, the distillation area is large, the heat treatment time is short, the efficiency is high, the recovery rate of the phosphorus sludge is more than 98 percent and is greatly superior to 86 percent of the rotary pot production, and the situation of large dust, serious pollution and disordered discharge of smoke in the rotary pot production is ended.
By arranging the mud phosphorus hopper, the screw conveyor and the screw conveyor, continuous feeding and continuous ash discharging are realized in the production process, the phosphorus steaming efficiency is improved, the device can continuously produce for 24 hours, and the production efficiency is greatly improved compared with the rotary pot adopted by most yellow phosphorus plants at present.
The invention adopts phosphorus furnace tail gas and hot air for auxiliary heating, heating medium enters from a coal burning port for burning, waste heat after burning passes through a heat exchanger of a waste heat recovery device, and heat is brought into the combustion furnace again through fresh cold air for recycling, thereby reducing the burning cost and improving the burning efficiency.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic process flow diagram of the present invention;
in the drawings, the components represented by the respective reference numerals are listed below:
1. a phosphorus sludge tank; 2. a sludge phosphorus pump; 3. a phosphorus sludge hopper; 4. a screw machine; 5. a sludge phosphorus processor; 6. a first water seal tank; 7. anti-blocking screws; 8. spraying a disc; 9. a spray water tank; 10. a spray pump; 11. a phosphorus collection tank; 12. a phosphorus pump; 13. a second water seal tank; 14. an exhaust gas treating machine; 15. a tail gas fan; 16. a third water seal tank; 17. a screw conveyor; 18. a heat exchanger; 19. a hot air blower; 20. a hot water tank; 21. an adjustable speed motor.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention is a method for recovering elemental phosphorus by distillation of phosphorus sludge, comprising the following steps:
the method comprises the following steps: conveying the phosphorus sludge to be recovered into a phosphorus sludge groove 1, and pumping hot water in a
step two: pumping the phosphorus sludge in the phosphorus sludge groove 1 into a phosphorus sludge hopper 3 above a phosphorus sludge processor 5 through a phosphorus sludge pump 2, and then conveying the phosphorus sludge into the phosphorus sludge processor 5 through a screw conveyor 4 in the phosphorus sludge hopper 3, wherein the phosphorus sludge in the phosphorus sludge groove 1 is pumped into the front of the phosphorus sludge hopper 3 above the phosphorus sludge processor 5 through the phosphorus sludge pump 2, the phosphorus sludge in the phosphorus sludge groove 1 is detected through a pH meter, and if the phosphorus sludge is peracid, the alkaline neutralization method is adopted to adjust the meta-acid phosphorus sludge, so that the pH value of the phosphorus sludge entering the phosphorus sludge processor 5 is about neutral;
step three: starting a driving mechanism of the phosphorus sludge treatment machine 5, wherein the
step four: coal materials are introduced into the mud phosphorus treatment machine 5 through a coal burning port to be combusted, a distillation pot in the mud phosphorus treatment machine 5 is heated, meanwhile, phosphorus furnace tail gas is purified by the first water seal box 6 and then is mixed with hot air after heat exchange, the oxygen content of the phosphorus furnace tail gas purified by the first water seal box 6 is less than 0.5 percent and is sent into the mud phosphorus treatment machine 5, the coal materials are assisted to be combusted outside the distillation pot of the mud phosphorus treatment machine 5, the distillation pot in the mud phosphorus treatment machine 5 is assisted to be heated, and the mud phosphorus treatment machine 5 is uniformly heated and heated under the heating of the coal materials, the phosphorus furnace tail gas and the hot air;
step five: in the heating and heat preservation process, phosphorus in the phosphorus sludge on the heating plate of the phosphorus sludge treatment machine 5 is evaporated and escaped, and enters the spraying disc 8 along the anti-blocking screw 7, water flow in the spraying disc 8 is obtained by pumping water in the spraying water tank 9 into the spraying water tank through the spraying pump 10, and the phosphorus vapor is subjected to rapid heat exchange and cooling treatment through a spraying system in the spraying disc 8;
step six: the cooled phosphorus vapor is converged by a collecting pipe, enters a
step seven: in the heating and heat preservation process, tail gas generated by combustion of the sludge phosphorus treatment machine 5 is discharged from a tail gas pipe on the side surface of the upper end of the sludge phosphorus treatment machine 5 under the action of a
In the first step, hot water in the
The heating heat preservation process in the phosphorus sludge treatment machine 5 is provided with two stages, the retort in the phosphorus sludge treatment machine 5 is heated to 100 ℃ in the first stage, keep warm for half an hour, evaporate the water in the phosphorus sludge, the retort in the phosphorus sludge treatment machine 5 is heated to about 450 ℃ in the second stage, keep warm for 7 hours, completely sublime the phosphorus in the phosphorus sludge as phosphorus vapor, evaporate the water in the phosphorus sludge through the first stage, avoid phosphorus vapor and water interact to form phosphine and hydrogen, there is the danger that leads to the explosion, avoid further oxidation of phosphine to phosphoric acid, aggravate the corruption of equipment.
The residual dry waste residue ash in the distillation pot in the sludge phosphorus treatment machine 5 is discharged out of the sludge phosphorus treatment machine 5 through the
When the sludge phosphorus treatment machine 5 works, water in sludge phosphorus evaporates at 100 ℃, yellow phosphorus evaporates at 281 ℃, yellow phosphorus is converted into red phosphorus when the yellow phosphorus is heated to 260 ℃ in an air-isolated mode, the red phosphorus is sublimated into phosphorus vapor when the red phosphorus is heated to 416 ℃, the phosphorus vapor is cooled and converted into the yellow phosphorus, all evaporated gas enters the spraying disc 8 through the anti-blocking spiral 7 and is cooled into the yellow phosphorus and the water, and the recovery of the yellow phosphorus is completed.
The process technology of the invention has the characteristics of high efficiency, environmental protection, safety, high heat energy utilization rate and continuous production, flames are not mixed outside in the production process, tail gas is orderly discharged, discharged dry ash has no elemental phosphorus, water is recycled and is not discharged, the operation environment is good, continuous feeding and continuous ash discharge are realized in the production process, the phosphorus steaming efficiency is improved, the device can realize 24-hour continuous production, the heat source adopts the recovery heat of phosphorus furnace tail gas and combustion medium, the combustion cost is reduced, the combustion efficiency is improved, the mud phosphorus recovery rate is more than 98 percent and is greatly superior to 86 percent of rotary pot production.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above are only preferred embodiments of the present invention, and the present invention is not limited thereto, and any modifications to the technical solutions described in the above embodiments, and equivalents of some technical features are included in the scope of the present invention.
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