A method for mixing and calcining heavy soda ash and light soda ash

Abstract

The present application provides a method for mixing and calcining heavy soda ash and light soda ash, including: a. distributing the wet heavy soda ash from the filtration process of the heavy soda ash workshop to the alkali chute pipe under the calciner and feeding it into the premixer; b. in the premixer, mixing the wet heavy soda ash with light soda ash, recycled alkali, and alkali dust to reduce the moisture content of the heavy soda ash; c. feeding the mixed alkali material into a light ash steam calciner for calcination to produce light soda ash and furnace gas; d. a part of the light soda ash coming out of the light ash steam calciner is returned to the premixer as recycled alkali; another part is transported and distributed to the heavy ash cooling alkali process by a scraper conveyor, and a scraper conveyor is arranged at the discharge port of the scraper conveyor to prevent foreign objects from entering the recycled alkali feeder; e. washing, cooling, and recovering ammonia from the furnace gas generated by calcination; f. using the hot alkali solution to wash the furnace gas, and after washing, the hot alkali solution flows back to the hot alkali solution storage tank for continuous circulation, and the qualified alkali solution is sent to brine refining. The method for mixing and calcining heavy soda ash and light soda ash provided by the present application can prevent foreign objects from entering the recycled alkali feeder.

Description

Technical Field

[0001] The present invention relates to the technical field of soda ash production, and particularly to a method for mixing and calcining heavy soda ash and light soda ash. Background Art

[0002] In the production process of soda ash, the light soda ash coming out of the calciner in the premixer needs to be transported by a discharge screw conveyor or a return alkali scraper conveyor. Part of the light soda ash is returned as return alkali to the premixer through a return alkali air seal valve. The heavy soda ash and the return alkali are fully mixed by a stirring shaft. After mixing, the moisture content of the heavy soda ash is reduced to within the range of 7-9% and then sent to the light ash calciner for calcination. During the process of the return alkali scraper conveyor transporting the return alkali to the return alkali feeder, since the return alkali contains foreign matters such as alkali scale, alkali balls, and ironware, after the foreign matters enter the return alkali feeder, it is easy to block or stop the alkali feeder, resulting in frequent failures of the return alkali feeder and seriously reducing the production efficiency. Summary of the Invention

[0003] The purpose of the present invention is to provide a method for mixing and calcining heavy soda ash and light soda ash to solve the technical problem that the return alkali feeder is easily blocked and stopped by foreign matters during the process of the return alkali scraper conveyor transporting the return alkali to the return alkali feeder, which seriously reduces the production efficiency.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is: to provide a method for mixing and calcining heavy soda ash and light soda ash, and the method for mixing and calcining heavy soda ash and light soda ash includes the following steps:

[0005] a. Distribute the wet heavy soda ash from the filtration process of the heavy soda ash workshop to the alkali chute under the calciner and send it into the premixer;

[0006] b. In the premixer, mix the wet heavy soda ash with light soda ash, return alkali, and alkali dust to reduce the moisture content of the heavy soda ash;

[0007] c. Send the mixed alkali material into the light ash steam calciner for calcination to generate light soda ash and furnace gas;

[0008] d. Part of the light soda ash coming out of the light ash steam calciner is returned to the premixer as return alkali; the other part is transported and distributed to the heavy ash cooling alkali process by a scraper conveyor, and the return alkali transported to the heavy ash cooling alkali process is filtered by a sieve grid device arranged at the discharge port of the scraper conveyor to prevent foreign matters from entering the return alkali feeder;

[0009] e. Wash, cool, and recover ammonia from the furnace gas generated by calcination;

[0010] f. Use the hot alkali solution to wash the furnace gas, and after washing, the hot alkali solution flows back to the hot alkali solution storage tank for continuous circulation, and the qualified alkali solution is sent to brine refining.

[0011] In one embodiment, the step of reducing the moisture content of the wet heavy soda ash is achieved by stirring with a stirring shaft in a premixer. During the stirring process, the wet heavy soda ash is fully mixed with light soda ash, recycled soda ash, and alkali dust, so that the moisture content of the heavy soda ash is reduced to within the range of 7-9%.

[0012] In one embodiment, the heating in the light ash steam calciner is carried out indirectly by medium-pressure steam. The medium-pressure steam enters the steam chamber from the central sleeve of the rotary joint and then enters the heating tubes to heat the heavy soda ash. The steam condensate is sent to different processes for reuse after one-time and secondary flashing.

[0013] In one embodiment, the steps of washing, cooling, and recovering ammonia from the furnace gas specifically include: the furnace gas first passes through a furnace gas separator to separate alkali dust, then enters an alkali dust scrubbing tower for washing, and then enters a furnace gas condensation tower to be indirectly cooled and cooled down by circulating water. The condensate is sprayed and washed to recover ammonia in the furnace gas. Part of the condensate returns to the furnace gas condensation tower to increase the condensate concentration, and part is sent to the distillation post.

[0014] In one embodiment, the steps of recycling and adjusting the concentration of the hot alkali solution specifically include: the alkali solution in the hot alkali solution storage tank is transported to the alkali dust scrubbing tower, where the hot alkali solution countercurrently washes the furnace gas in the tower. After washing, the hot alkali solution flows back to the hot alkali solution storage tank for continuous recycling. When the concentration of the hot alkali solution exceeds the parameter index, it is adjusted to a qualified concentration by supplementing soft water and then sent to brine refining.

[0015] In one embodiment, the sieve grid device is arranged at the discharge port of the scraper conveyor. The sieve grid device includes a plurality of sieve rods arranged in parallel at equal intervals. Both ends of the sieve rods are connected to the discharge port, and the length direction of the sieve rods is parallel to the conveying direction of the scraper conveyor.

[0016] In one embodiment, the cross-sectional dimension of the sieve rod is Ø26mm, the length of the sieve rod is 1200mm, and the spacing between the sieve rods is 60mm.

[0017] In one embodiment, a gap of 20-30mm is reserved between the top of the sieve grid device and the bottom of the scraper of the scraper conveyor.

[0018] In one embodiment, an elastic guide plate is further included. The top of the elastic guide plate is fixed to the rear end of the discharge port, and the top of the elastic guide plate is flush with the bottom plate of the lower box body of the scraper conveyor. The elastic guide plate has an inclined downward structure, and the elastic guide plate is provided with special-shaped holes, and the sieve rods are located in the special-shaped holes.

[0019] In one embodiment, a bumper rod is arranged at the bottom of the elastic guide plate. The bottom of the bumper rod is fixed to the elastic guide plate, and the top of the bumper rod closely adheres to the bottom surface of the sieve rod.

[0020] In one or more of the above technical solutions in the embodiments of the present invention, there are at least the following technical effects or advantages:

[0021] The method for mixing and calcining heavy soda ash and light soda ash provided by the embodiments of the present invention effectively avoids foreign objects from entering the return soda feeder by arranging a sieve grid device at the discharge port of the scraper conveyor. This greatly reduces the situation of blockage and stalling of the return soda feeder caused by foreign objects, thereby significantly improving the production efficiency of soda ash calcination and the stability of equipment operation. In addition, by arranging a sieve grid device at the discharge port of the scraper conveyor, the foreign objects separated by screening can be transported away from the discharge port through the scraper conveyor, avoiding the accumulation of foreign objects on the sieve grid device and reducing the screening efficiency of the sieve grid device or even blocking the sieve grid device, so that the sieve grid device can continuously carry out efficient screening work. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0023] Figure 1 is the process flow diagram of the method for mixing and calcining heavy soda ash and light soda ash provided by the embodiments of the present invention;

[0024] Figure 2 is the structural schematic diagram of the sieve grid device provided by the embodiments of the present invention;

[0025] Figure 3 is the structural schematic diagram of the sieve grid device provided by another embodiment of the present invention;

[0026] Figure 4 is Figure 3 the cross-sectional view of the sieve grid device in

[0027] Figure 5 is the schematic diagram when the elastic guide plate provided by the embodiments of the present invention guides foreign objects;

[0028] Figure 6 is the structural schematic diagram of the elastic guide plate provided by the embodiments of the present invention.

[0029] Among them, the respective reference numerals are as follows:

[0030] 1. Scraper conveyor; 2. Sieve grid device; 3. Elastic guide plate; 4. Bumping rod; 5. Foreign object; 11. Chain plate; 12. Lower box body; 13. Discharge port; 31. Special-shaped hole; 32. Material dropping hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0032] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

[0033] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality of" means two or more unless otherwise specifically defined.

[0034] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] Please refer to Figure 1 , the embodiments of the present application provide a method for mixing and calcining heavy soda ash and light soda ash, which specifically includes the following processes:

[0036] The wet heavy soda ash from the filtration process of the heavy soda ash workshop is respectively distributed to the 1# and 2# lower soda chutes by the heavy soda ash belt conveyor through the unilateral electro-hydraulic plow-type tripper and sent into the pre-mixer through the heavy soda ash gas seal valve; in the pre-mixer, it is fully mixed with the returned soda ash sent through the returned soda ash gas seal valve and the soda ash dust sent by the soda ash dust screw conveyor by the stirring shaft of the pre-mixer, reducing the moisture content of the heavy soda ash (reducing the moisture content of the heavy soda ash to 7-9%) and sending it to the light ash calciner.

[0037] The mixed alkali from the premixer enters the light ash steam calciner through the feeding screw conveyor. The heavy alkali is indirectly heated by medium-pressure steam in the calciner. The medium-pressure steam from the pipe network enters the steam chamber through the central sleeve of the rotary joint, then enters the four rows of heating tubes from the steam chamber. The steam condensate enters the water storage tank through the sleeve at the rotary joint and then goes to the flash evaporator for the first flash evaporation. The vapor is sent to the heavy ash process for use, and the condensate is sent to the secondary flash evaporator for the second flash evaporation. The steam from the second flash evaporation is sent to the 0.5 MPa pipe network to the steam absorption post, and the condensate enters the process return water pipe network to the waste heat recovery power generation system.

[0038] The wet heavy alkali is heated and decomposed in the light ash calciner to produce light soda ash and furnace gas. The light soda ash coming out of the calciner, through the discharge screw conveyor and the return alkali scraper conveyor, part of it enters the return alkali air seal valve as the return alkali, and the other part is distributed to the heavy ash cooling alkali process through the scraper conveyor. A sieve grid device 2 for filtering the material is arranged at the discharge port of the scraper conveyor.

[0039] The furnace gas generated by the decomposition of the light ash calciner enters the dust separator after separating the alkali dust, and then enters the alkali dust scrubbing tower. After the hot alkali solution washes the alkali dust, it enters the furnace gas condensation tower and is indirectly cooled by circulating water. The condensate is sprayed and washed to recover ammonia in the furnace gas. Part of the generated condensate is sent to the distillation post by the condensate pump; the other part returns to the furnace gas condensation tower to circulate and cool the furnace gas and increase the concentration of the condensate. The furnace gas coming out of the furnace gas condensation tower enters the furnace gas scrubbing tower. The furnace gas is directly countercurrently washed by the ammonia-free washing water in the tower and then sent to carbonization for soda making by compression; the ammonia-free washing water comes from the filtration post, and the washing liquid is sent to the filtration post by the washing liquid pump after washing the furnace gas. The alkali solution in the hot alkali solution storage tank is transported to the alkali dust scrubbing tower by the hot alkali solution pump. In the tower, the hot alkali solution countercurrently washes the furnace gas, and after washing, the hot alkali solution flows back to the hot alkali solution storage tank to continue circulating (when the concentration of the hot alkali solution is higher than the parameter index, soft water is supplemented), and the qualified alkali solution is sent to brine refining.

[0040] Please refer to Figure 2 , the embodiment of the present application provides a scraper conveyor 1 and a sieve grid device 2. Among them, the scraper conveyor 1 is used to convey materials, and a discharge port 13 is arranged on the scraper conveyor 1. The discharge port 13 is communicated with the inlet of the return alkali feeder; the sieve grid device 2 is arranged on the discharge port 13 of the scraper conveyor 1, and the sieve grid device 2 is used to screen the materials entering the discharge port 13.

[0041] Specifically, the scraper conveyor 1 includes a lower box body 12 and a chain plate 11 (including a scraper and a chain connecting the scraper) located inside the lower box body 12. The discharge port 13 is arranged at the bottom of the lower box body 12; the cross-sectional dimension of the sieve rod is Ø26mm, the length of the sieve rod is 1200mm, and the distance between the sieve rods is 60mm. The sieve rods are made of round steel.

[0042] The soda ash calcination return soda material conveying device provided by this embodiment effectively avoids foreign objects from entering the return soda feeder by setting a sieve grid device 2 at the discharge port 13 of the scraper conveyor 1. This greatly reduces the situation of the return soda feeder being blocked and stopped due to foreign objects 5, thereby significantly improving the production efficiency of soda ash calcination and the stability of equipment operation. In addition, by setting a sieve grid device 2 at the discharge port 13 of the scraper conveyor 1, the separated foreign objects 5 can be transported away from the discharge port 13 through the scraper conveyor 1, avoiding the accumulation of foreign objects 5 on the sieve grid device 2, which reduces the screening efficiency of the sieve grid device 2 or even blocks the sieve grid device 2, enabling the sieve grid device 2 to continuously carry out efficient screening work.

[0043] In one embodiment, it further includes a post-system crushing device. The post-system crushing device is connected to the scraper conveyor 1, and the post-system crushing device of the scraper conveyor 1 is located behind the discharge port 13. The scraper conveyor 1 transports foreign objects 5 (alkali scale, alkali balls, ironware) to the post-system crushing device, and the post-system crushing device crushes and separates the foreign objects 5. Optionally, a magnetic separation screening device can be set at the connection position between the scraper conveyor 1 and the post-system crushing device to sort the foreign objects 5 entering the post-system crushing device, pick out the ironware in the foreign objects 5, so that the foreign objects 5 entering the post-system crushing device are basically alkali scale and alkali balls, and then use the post-system crushing device to crush the alkali scale and alkali balls to facilitate the recovery of alkali in the foreign objects 5.

[0044] In one embodiment, the scraper conveyor 1 is arranged obliquely upward along the material transportation direction.

[0045] In one embodiment, the sieve grid device 2 includes multiple sieve rods arranged equidistantly and parallelly. Both ends of the sieve rods are connected to the discharge port 13, and the length direction of the sieve rods is parallel to the conveying direction of the scraper conveyor 1. By setting the length direction of the sieve rods parallel to the conveying direction of the scraper conveyor 1, it avoids the phenomenon that the scraper conveyor 1 is blocked or damaged due to the sieve rods blocking the movement of the chain plate 11, making the transportation of the scraper conveyor 1 smooth.

[0046] Furthermore, a gap of 20 - 30 mm is reserved between the top of the sieve grid device 2 and the bottom of the scraper of the scraper conveyor 1. By reserving enough gap between the sieve grid device 2 and the bottom of the scraper, it avoids the sieve grid device 2 from hindering the movement of the scraper, and avoids the phenomenon that the scraper conveyor 1 is blocked or damaged due to the sieve rods blocking the movement of the chain plate 11, further ensuring the smooth transportation of the scraper conveyor 1.

[0047] Such as Figures 3 - 6As shown, the scraper conveyor 1 in the attached drawings all transports from right to left. When the lower half of the foreign object 5 extends into the gap between the sieve rods, and the upper half of the foreign object 5 is above the sieve rods, at this time, when the scraper of the scraper conveyor 1 transports the foreign object 5, the scraper pushes the foreign object 5 to slide along the length direction of the sieve rods until the rear end of the sieve grid device 2 (the left side of the sieve grid device 2). At this time, since the bottom of the foreign object 5 is still below the bottom plate of the lower box body 12, it will cause the foreign object 5 to get stuck at the edge of the sieve grid device 2 and restrict the movement of the scraper, resulting in the phenomenon that the scraper conveyor 1 stalls or is damaged by pulling.

[0048] To solve the above problems, in one embodiment, the conveying device further includes an elastic guide plate 3. The top of the elastic guide plate 3 is fixed to the rear end of the discharge port 13, and the top of the elastic guide plate 3 is flush with the bottom plate of the lower box body 12 of the scraper conveyor 1. The elastic guide plate 3 has an inclined downward structure, and a special-shaped hole 31 is provided on the elastic guide plate 3. The sieve rods are located in the special-shaped hole 31. The elastic guide plate 3 can specifically be a metal plate.

[0049] When the lower half of the foreign object 5 extends into the gap between the sieve rods, during the process of the scraper pushing the foreign object 5 to slide along the length direction of the sieve rods (the foreign object 5 moves towards the direction close to the elastic guide plate 3), the lower half of the foreign object 5 will first contact the upper surface of the elastic guide plate 3, and under the guiding action of the elastic guide plate 3, while the foreign object 5 slides horizontally along the plane where the sieve rods are located, it can also gradually move upward along the upper surface of the elastic guide plate 3. When the foreign object 5 is close to the rear end of the sieve grid device 2, at this time, the foreign object 5 has risen to a position flush with the height of the bottom plate of the lower box body 12 (the top of the elastic guide plate 3 is flush with the bottom plate of the lower box body 12 of the scraper conveyor 1), so that the foreign object 5 can smoothly pass through the rear end of the sieve grid device 2, avoiding the phenomenon that the scraper conveyor 1 is stalled or damaged by the foreign object 5 due to the foreign object 5 getting stuck at the edge of the sieve grid device 2.

[0050] In addition, the elastic guide plate has a certain degree of flexibility and can be deformed and adjusted according to the height position and movement speed of the bottom of the foreign object 5, so that the elastic guide plate 3 can guide foreign objects 5 of different shapes and sizes, further reducing the probability of the phenomenon that the scraper conveyor 1 is stalled or damaged by the foreign object 5 due to the foreign object 5 getting stuck at the edge of the sieve grid device 2.

[0051] In one embodiment, a bumper rod 4 is provided at the bottom of the elastic guide plate 3. The bottom of the bumper rod 4 is fixed to the elastic guide plate 3, and the top of the bumper rod 4 is closely attached to the bottom surface of the sieve rod.

[0052] When the elastic guide plate 3 guides the foreign object 5, due to the force exerted on the elastic guide plate 3 by the foreign object 5, the elastic guide plate 3 bends downward (as Figure 5As shown in the figure, at this time, the striker 4 moves downward and disengages from the sieve rod. When the foreign object 5 leaves the sieve grid device 2, the elastic guide plate 3 at this time loses the pressure given by the foreign object 5, thereby causing the elastic guide plate 3 to rebound and reset, and further causing the striker 4 to move upward and strike the bottom of the sieve rod, causing the sieve rod to vibrate, which is conducive to dredging the materials stuck between the sieve rods and improving the screening efficiency of the sieve grid device 2.

[0053] Optionally, the top of the striker 4 can be set as an arc surface adapted to the bottom surface of the sieve rod, so as to facilitate the striker 4 to better strike the sieve rod and cause the sieve rod to vibrate.

[0054] As Figure 6 shown, in one embodiment, a plurality of material dropping holes 32 are further provided on the elastic guide plate 3. Through the material dropping holes 32 on the elastic guide plate 3, the materials screened by the sieve grid device 2 can fall from the material dropping holes 32 of the elastic guide plate 3, reducing the obstruction of the elastic guide plate 3 to the material dropping and ensuring the screening efficiency.

[0055] In addition, by providing a plurality of material dropping holes 32, the material used for manufacturing the elastic guide plate 3 can also be reduced, and the cost of setting the elastic guide plate 3 can be reduced.

[0056] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for mixing and calcining heavy alkali and light soda ash, characterized in that The following steps are involved: a. Distribute the wet heavy alkali from the filtration process of the heavy alkali workshop to the alkali chute under the calciner and send it to the premixer; b. In the premixer, the wet heavy caustic soda is mixed with light soda ash, return caustic soda and caustic soda dust to reduce the moisture content of the heavy caustic soda; c. Sending the mixed alkali material into a light ash steam calcining furnace for calcination to generate light soda ash and furnace gas; d. A part of the light soda ash coming out of the light ash steam calcining furnace is returned to the premixer as return alkali; the other part is transported to the heavy ash cooling alkali process through a scraper conveyor. The return alkali transported to the heavy ash cooling alkali process is filtered by a sieve device installed at the discharge port of the scraper conveyor to prevent foreign matter from entering the return alkali feeder; e. washing, cooling and recovering ammonia from the furnace gas produced by calcination; f. Use hot alkali liquid to wash furnace gas. After washing, the hot alkali liquid flows back to the hot alkali liquid storage tank for continuous circulation. The qualified alkali liquid is sent to brine for refining; The steps of washing, cooling and recovering ammonia of the furnace gas specifically include: the furnace gas first passes through a furnace gas separator to separate alkali dust, then enters an alkali dust washing tower for washing, then enters a furnace gas condensing tower to be indirectly cooled by circulating water, and the condensate is sprayed and washed to recover ammonia in the furnace gas, part of the condensate is returned to the furnace gas condensing tower to increase the concentration of the condensate, and part is sent to a distillation station; The sieve device is arranged on the discharge port of the scraper conveyor, and the sieve device comprises a plurality of equidistant and parallel sieve bars, both ends of which are connected to the discharge port, and the length direction of the sieve bars is parallel to the conveying direction of the scraper conveyor; The screen device also includes an elastic guide plate, the top of which is fixed to the rear end of the discharge port, and the top of which is flush with the bottom plate of the lower box of the scraper conveyor, the elastic guide plate is inclined downward, and a special-shaped hole is provided on the elastic guide plate, and the screen rod is located in the special-shaped hole; A striker is arranged at the bottom of the elastic guide plate, the bottom of the striker is fixed on the elastic guide plate, and the top of the striker is in close contact with the bottom surface of the screen rod.

2. The method for mixing and calcining heavy alkali and light soda ash according to claim 1, characterized in that: The step of reducing the moisture content of the wet weight alkali is achieved by stirring the stirring shaft in the premixer. During the stirring process, the wet weight alkali is fully mixed with light soda ash, return alkali and alkali dust, so that the moisture content of the heavy alkali is reduced to the range of 7-9%.

3. The method for mixing and calcining heavy alkali and light soda ash according to claim 1, characterized in that: The heating in the light ash steam calcining furnace is carried out indirectly through medium-pressure steam. The medium-pressure steam enters the steam chamber from the central sleeve of the rotary joint, and then enters the heating pipe to heat the heavy alkali. The steam condensate is sent to different processes for reuse after primary and secondary flash.

4. The method for mixing and calcining heavy alkali and light soda ash according to claim 1, characterized in that: The steps of recycling and adjusting the concentration of hot alkali solution specifically include: the alkali solution in the hot alkali solution storage tank is transported to the alkali dust washing tower, the hot alkali solution in the tower countercurrently washes the furnace gas, and the hot alkali solution after washing is returned to the hot alkali solution storage tank for continued recycling. When the concentration of the hot alkali solution exceeds the parameter index, it is adjusted to a qualified concentration by adding soft water, and then sent to brine for refining.

5. The method for mixing and calcining heavy alkali and light soda ash according to claim 1, characterized in that: The cross-sectional dimension of the sieve rod is Ø26mm, the length of the sieve rod is 1200mm, and the spacing between the sieve rods is 60mm.

6. The method for mixing and calcining heavy alkali and light soda ash according to claim 1, characterized in that: A gap of 20-30 mm is reserved between the top of the screen device and the bottom of the scraper of the scraper conveyor.

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