Production system of spherical anhydrous calcium chloride

Abstract

The utility model relates to a spherical anhydrous calcium chloride production system and belongs to the technical field of anhydrous calcium chloride production. The production system comprises a limestone mill, a reaction device, a neutralizing device, a filtering device and a fluidized bed which are sequentially arranged, the limestone mill is connected with the reaction device through a solid material conveyor, and the reaction device is connected with a hydrochloric acid conveying device. The reaction device, the neutralizing device, the filtering device and the fluidized bed are sequentially connected through pipelines, each connecting pipeline is provided with a material pump, and the neutralizing device is provided with an alkaline material conveying device. According to the calcium chloride production system, the neutralizing device is added to adjust the PH value of a calcium chloride solution, it is ensured that the solution cannot be reduced to be acidic under the hydrolysis action in the subsequent working section, limestone enters the reaction device after being ground through the grinding machine, and the dissolution efficiency of the limestone is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of calcium chloride production, in particular to a production system of spherical anhydrous calcium chloride. Background Art

[0002] Calcium chloride is a very common industrial chemical, often used as a multi-purpose desiccant, refrigerant, building antifreeze, lubricant additive, etc.

[0003] In the existing industrial production of anhydrous calcium chloride, calcium chloride liquid is mostly prepared by the reaction of hydrochloric acid and limestone. The most widely used method is the immersion method, that is, adding blocky limestone and hydrochloric acid into the reaction device and letting it stand for dozens of hours to react. This process cannot be produced continuously and has low production capacity. Therefore, a large amount of cost needs to be invested in configuring the reaction device to increase production capacity. In order to meet subsequent production, the storage capacity of the calcium liquid needs to be increased, which is costly. Summary of the invention

[0004] In order to solve the problems in the prior art, the utility model patent designs a production system for spherical anhydrous calcium chloride to solve the problem of low production efficiency of calcium chloride solution in the existing anhydrous calcium chloride production device.

[0005] The technical solution adopted by the utility model is: the production system comprises a limestone mill, a reaction device, a neutralization device, a filtering device and a fluidized bed which are arranged in sequence, the limestone mill and the reaction device are connected via a solid material conveyor, the reaction device is connected with a hydrochloric acid conveying device, the reaction device, the neutralization device, the filtering device and the fluidized bed are connected in sequence via pipelines, each connecting pipeline is respectively provided with a material pump, and the neutralization device is provided with an alkaline material conveying device.

[0006] Furthermore, an atomizing feeding device is provided at the bottom side of the feeding end of the fluidized bed, and a return port is opened at the top. The atomizing feeding device includes a feeding pipe, and a plurality of atomizing nozzles are evenly arranged on the feeding pipe, and the nozzles of the atomizing nozzles are arranged upward.

[0007] Furthermore, a solution temporary storage tank is provided between the filtering device and the fluidized bed, and a discharge end of the solution temporary storage tank is connected to a feed pipe of the fluidized bed through a pressurized pipeline.

[0008] Furthermore, a screening and returning device is provided at the discharge end of the fluidized bed, and the screening and returning device comprises a two-stage screener, a returning material conveying device and a grinder.

[0009] Furthermore, the return material port is provided with a screw feeder, and the return material conveying device is connected to the screw feeder.

[0010] Furthermore, the exhaust port at the top of the fluidized bed is connected to a tail gas treatment system, which includes a cyclone dust collector, a spray tower and a fan connected in sequence, and the air inlet end of the cyclone dust collector is connected to the exhaust port of the fluidized bed.

[0011] Furthermore, the discharge port at the bottom of the cyclone dust collector is connected to the screw feeder at the return port of the fluidized bed through a conveying device.

[0012] Furthermore, the spray tower is provided with a circulating spray device, which includes a circulating pipeline, a circulating pump and a plurality of spray heads, and the liquid outlet end of the circulating pump is connected to the neutralization device through a three-way valve pipeline.

[0013] Furthermore, the reaction device and the neutralization device are both provided with an electric stirrer.

[0014] Compared with the prior art, the production system of spherical anhydrous calcium chloride designed by the utility model patent has the following advantages:

[0015] First, the production system is equipped with a limestone mill, which grinds the limestone and then feeds it into the reaction device to react with hydrochloric acid, greatly increasing the reaction speed of the two and improving production efficiency. In addition, the limestone powder reacts more fully with hydrochloric acid, which improves the utilization rate of raw materials.

[0016] Second, the production system is equipped with a neutralization device to adjust the pH value of the calcium chloride solution to prevent the pH value of the solution from dropping to acidic due to hydrolysis in the subsequent process. At the same time, it neutralizes the excess hydrochloric acid in the calcium chloride solution and reduces the hydrochloric acid content in the tail gas of the drying section.

[0017] Third, a screening and returning device is set at the discharge end of the fluidized bed. The unqualified small-particle powder and oversized particles in the product are screened out through a two-stage screener. The small-particle powder is directly returned to the fluidized bed for re-granulation, and the oversized particles are crushed by the grinder and then returned to the fluidized bed for re-granulation, thereby improving the quality of the product.

[0018] Fourthly, the discharge end of the cyclone dust collector of the fluidized bed exhaust gas treatment system also returns the dust in the recovered exhaust gas to the fluidized bed through a conveying device for re-production of granulation; and the washing liquid of the spray tower has a higher concentration of calcium chloride after circulating the washing exhaust gas, and is conveyed to the neutralization device to realize the recovery and utilization of the material powder entrained in the exhaust gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the production system of spherical anhydrous calcium chloride.

[0020] In the figure, 1 is a limestone mill, 2 is a reaction device, 3 is a neutralization device, 4 is a filtering device, 5 is a solution temporary storage tank, 6 is a fluidized bed, 7 is a screening and returning device, 8 is an electric stirrer, 21 is a hydrochloric acid conveying device, 31 is a slaked lime conveying device, 61 is a cyclone dust collector, 62 is a spray tower, 63 is an induced draft fan, 64 is a circulating spraying device, 65 is a circulating pump, 66 is a heating and air supply device, 91 is a feeding pipe, 92 is an atomizing nozzle, and 93 is a pressurized feeding pipeline. DETAILED DESCRIPTION

[0021] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments. The technical solutions in the embodiments of the utility model are clearly and completely described, and the described embodiments are only embodiments of a part of the invention, not all of it. Based on the embodiments in the invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the invention.

[0022] like Figure 1 As shown, the utility model patent designs an embodiment of a production system of spherical anhydrous calcium chloride. In this embodiment, the production system includes a limestone mill 1, a reaction device 2, a neutralization device 3, a filter device 4, a solution temporary storage tank 5 and a fluidized bed 6 arranged in sequence. The limestone mill 1 is used to grind limestone blocks into limestone powder. Its discharge end is connected to the reaction device 2 through a solid material conveyor. The reaction device 2 is connected to a hydrochloric acid conveying device 21, which conveys hydrochloric acid to the reaction device 2 for soaking and dissolving limestone to prepare a calcium chloride solution. The reaction device 2, the neutralization device 3, the filter device 4, the solution temporary storage tank 5 and the fluidized bed 6 are connected in sequence through pipelines, and each connecting pipeline is respectively provided with a material pump to provide power for the circulation of the calcium chloride solution. The neutralization device 3 is provided with a slaked lime conveying device 31, and slaked lime is fed into the neutralization device 3 to adjust the pH value of the calcium chloride solution to alkaline. The neutralization device 3 is provided with an online pH meter to display the adjusted pH value in real time. At the same time, the reaction device 2 and the neutralization device 3 are both provided with an electric stirrer 8 for accelerating the reaction and ensuring that the materials in the device react fully. The filter device 4 is provided with multiple filter plates to filter the impurities in the solution, and is also provided with a backwash drainage pipeline to regularly clean the impurities on the filter plates. The filtered calcium chloride solution is stored in a solution temporary storage tank 5.

[0023] The bottom side of the feed end of the fluidized bed 6 is provided with an atomizing feed device, a return port is provided at the top, an air inlet is provided at the bottom, a spiral feeder is provided at the return port, and the air inlet is connected to a heating air supply device 66. The atomizing feed device includes a feed pipe 91, on which a plurality of atomizing nozzles 92 are evenly arranged, and the nozzles of the atomizing nozzles 92 are arranged upward. The feed end of the feed pipe 91 is connected to the solution temporary storage tank 5 through a pressurized feed line 93. The exhaust port at the top of the fluidized bed 6 is connected to an exhaust gas treatment system, which includes a cyclone dust collector 61, a spray tower 62 and an induced draft fan 63 connected in sequence, and the air inlet end of the cyclone dust collector 61 is connected to the exhaust port of the fluidized bed 6. The discharge end of the cyclone dust collector 61 is provided with a conveying mechanism connected to the spiral feeder at the return port of the fluidized bed 6. The spray tower 62 is provided with a circulating spray device 64, which includes a circulating pump 65 and a plurality of spray heads connected by a circulating pipeline. The liquid outlet of the circulating pump 65 is connected to the neutralization device 3 through a three-way valve pipeline to regularly transport the spray liquid with increased concentration to the neutralization device 3.

[0024] The discharge end of the fluidized bed 6 is provided with a screening and returning device 7, which includes a two-stage screener, a returning conveyor and a grinder. The two-stage screener first screens out the unqualified small-particle powder with a particle size less than 1 mm in the product, and then screens out the unqualified large-particle material with a particle size greater than 10 mm. The calcium chloride crystals with a particle size between 1 mm and 10 mm are collected as finished products and packaged. The screened small-particle powder is transported back to the screw feeder at the return port of the fluidized bed 6 by the returning conveyor and re-entered into the fluidized bed 6. The screened large-particle material is sent to the grinder for grinding and crushing, and then transported to the screw feeder at the return port of the fluidized bed 6 and re-entered into the fluidized bed 6.

[0025] When the production system of spherical anhydrous calcium chloride disclosed in the utility model patent is used, its production process includes the following steps:

[0026] (1) Production of calcium liquid: limestone blocks are placed in a limestone mill 1, which can crush the limestone blocks. Limestone powder and hydrochloric acid enter a reaction device 2. An electric stirrer 8 is provided in the reaction device 2 to keep the solution in the reaction device 2 in a turbulent state, thereby reducing the sedimentation of limestone powder, accelerating the reaction, and improving the utilization rate of limestone and hydrochloric acid.

[0027] (2) Neutralization of calcium solution: The calcium chloride solution after the reaction is discharged into the neutralization device 3, and slaked lime powder is added to adjust the pH value of the solution to alkaline. The neutralization device 3 is also provided with an electric stirrer 8 to make the solution in the neutralization device 3 in a turbulent state, reduce the sedimentation of slaked lime powder, accelerate hydrolysis and reaction, improve the utilization rate of slaked lime, and ensure that it will not be reduced to acidity under the hydrolysis effect in the subsequent process. The liquid discharged from the neutralization device 3 enters the filtering device 4, and the insoluble matter and impurities are discharged. The filtered calcium chloride clear liquid enters the solution temporary storage tank 5.

[0028] (3) Liquid atomization and fluidized drying: The fluidized bed 6 is provided with an air distribution plate. The air is heated by the heating and air supply device 66 and then fed into the fluidized bed through the air inlet. The air distribution plate forms a stable fluidized wind, which blows up the small calcium chloride crystal particles in the bed to form a fluidized state. The calcium chloride liquid is atomized by the spray feeding device and fed into the fluidized bed 6. After atomization, the liquid evenly covers the fluidized calcium chloride seed crystals and gradually grows to form particles. At the same time, the calcium chloride particles are dried. After the heat exchange and drying are completed, the gas takes away the moisture and is discharged from the exhaust port in the form of tail gas. After the particles are dried, they are discharged from the fluidized bed 6 from the discharge port.

[0029] (4) Screening, returning and discharging: The material discharged from the fluidized bed 6 passes through the screening and returning device 7. The material with a qualified particle size is discharged as a finished product. The remaining oversized particles are crushed and returned to the fluidized bed 6 together with the small particles. They are put into the bed through the return port and participate in granulation again as seeds. The process of step (3) is repeated.

[0030] (5) Dust collection and utilization: The tail gas discharged from the fluidized bed 6 contains calcium chloride dust, which is recovered by the cyclone dust collector 61 and returned to the fluidized bed 6 as a seed to participate in the granulation work. The remaining dust entrained in the tail gas enters the spray tower 62 and is washed by the spray liquid and then quickly dissolved. When the solution concentration of the spray liquid in the spray tower 62 increases to a certain value, it will be discharged to the calcium chloride liquid neutralization device 3 and participate in the granulation work again.

[0031] The above contents are only preferred embodiments of the present invention and cannot be used to limit the scope of implementation of the present invention. That is, any simple equivalent changes and modifications made according to the claims and description of the present invention are still within the scope of the present invention.

Claims

1. A production system for spherical anhydrous calcium chloride, characterized in that, The production system comprises a limestone mill, a reaction device, a neutralization device, a filtering device and a fluidized bed which are arranged in sequence. The limestone mill is connected to the reaction device via a solid material conveyor, the reaction device is connected to a hydrochloric acid conveying device, the reaction device, the neutralization device, the filtering device and the fluidized bed are connected in sequence via pipelines, each connecting pipeline is respectively provided with a material pump, and the neutralization device is provided with an alkaline material conveying device.

2. A production system for spherical anhydrous calcium chloride according to claim 1, characterized in that, An atomizing feeding device is arranged at the bottom side of the feeding end of the fluidized bed, and a return port is opened at the top. The atomizing feeding device comprises a feeding pipe, and a plurality of atomizing nozzles are evenly arranged on the feeding pipe, and the nozzles of the atomizing nozzles are arranged upward.

3. A production system for spherical anhydrous calcium chloride according to claim 2, characterized in that, A solution temporary storage tank is arranged between the filtering device and the fluidized bed, and the discharge end of the solution temporary storage tank is connected with the feed pipe of the fluidized bed through a pressurized pipeline.

4. A production system for spherical anhydrous calcium chloride according to claim 3, characterized in that, The discharge end of the fluidized bed is provided with a screening and returning device, which comprises a two-stage screener, a returning material conveying device and a grinder.

5. A production system for spherical anhydrous calcium chloride according to claim 4, characterized in that, The return material port is provided with a screw feeder, and the return material conveying device is connected to the screw feeder.

6. A production system for spherical anhydrous calcium chloride according to claim 5, characterized in that, The exhaust port at the top of the fluidized bed is connected to an exhaust gas treatment system, which includes a cyclone dust collector, a spray tower and a fan connected in sequence, and the air inlet end of the cyclone dust collector is connected to the exhaust port of the fluidized bed.

7. A production system for spherical anhydrous calcium chloride according to claim 6, characterized in that, The discharge port at the bottom of the cyclone dust collector is connected to the screw feeder at the return port of the fluidized bed through a conveying device.

8. A production system for spherical anhydrous calcium chloride according to claim 7, characterized in that, The spray tower is provided with a circulating spray device, which includes a circulating pipeline, a circulating pump and a plurality of spray heads. The liquid outlet end of the circulating pump is connected to the neutralizing device through a three-way valve pipeline.

9. A production system for spherical anhydrous calcium chloride according to claim 1, characterized in that, The reaction device and the neutralization device are both provided with electric stirrers.

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