Device for concentrating and recovering strontium chloride in wastewater

Abstract

The utility model relates to the field of magnetic material equipment, and discloses a device for concentrating and recovering strontium chloride in waste water, which comprises a heat exchange kiln, which comprises a kiln body which is transversely arranged and can rotate, a feed port and a discharge port are respectively arranged at two ends of the kiln body, a spiral guide plate is arranged inside the kiln body, and a sectional type water cooling component is wound outside the kiln body; two interfaces of the steam generator are respectively communicated with the water inlet and the water outlet of the sectional type water cooling component; the triple heat exchange concentration device is communicated with the steam generator. According to the device, the strontium chloride in the bonded permanent magnetic ferrite production wastewater can be concentrated and recovered, and the obtained strontium chloride recovery solution can be repeatedly used for preparing the bonded permanent magnetic ferrite, so that the utilization rate of strontium resources can be remarkably improved, the waste of the strontium resources is effectively reduced, and the cost is greatly reduced. On the basis, steam used for concentrating and recycling strontium chloride also comes from the production process of the bonded permanent magnetic ferrite, and full utilization of heat energy can be realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to magnetic material equipment field especially relates to a strontium chloride concentration recovery device in wastewater. BACKGROUND

[0002] At present, the bonded permanent magnet ferrite is mostly strontium ferrite, and the main raw material of strontium is strontium carbonate. The raw ore celestite of strontium carbonate is not abundant in China, and most of the grade is not high, which leads to a high proportion of strontium carbonate in the cost of raw materials.

[0003] We found in the production process that the concentration of strontium chloride in the wastewater discharged by the bonded permanent magnet ferrite production can reach about 3%, and a large amount of strontium will exist in the solid waste for harmless treatment after the wastewater is treated. If this part of strontium chloride can be recycled as raw material, the cost-saving effect will be very obvious for large-scale enterprises.

[0004] In the prior art, patent CN201910898377.6 discloses a device for recovering sodium chloride from wastewater for preparing bonded permanent magnet ferrite powder, which mainly utilizes the heat generated in the process of preparing bonded permanent magnet ferrite powder to crystallize and concentrate the wastewater, and can separate the salt in the wastewater to obtain usable sodium chloride, but it does not involve the recycling of strontium chloride. UTILITY MODEL CONTENTS

[0005] To solve the above technical problems, the utility model provides a strontium chloride concentration recovery device in wastewater. The device can realize the concentration and recovery of strontium chloride in the wastewater of bonded permanent magnet ferrite production, and the obtained strontium chloride recovery solution can be repeatedly used for the preparation of bonded permanent magnet ferrite, so as to significantly improve the utilization rate of strontium resources, effectively reduce the waste of strontium resources, and greatly reduce the cost. On this basis, the steam used for strontium chloride concentration recovery is also derived from the production process of bonded permanent magnet ferrite, which can realize the full utilization of heat energy.

[0006] The specific technical scheme of the utility model is as follows: a strontium chloride concentration recovery device, which comprises:

[0007] The heat exchange kiln comprises a kiln body arranged transversely and capable of rotating, an inlet and an outlet at two ends of the kiln body respectively, a spiral guide plate arranged in the kiln body, and a segmented water cooling component coiled outside the kiln body.

[0008] The steam generator is connected to the water inlet and the water outlet of the segmented water cooling component through two interfaces, so as to realize the collection of hot water and the conversion of steam and the supply of cooling water (to the segmented water cooling component).

[0009] The triple heat exchange concentration device is communicated with the steam generator, so as to realize the delivery of steam to the triple heat exchange concentration device.

[0010] The production process of the bonded permanent magnet ferrite mainly includes: densification of iron red and strontium carbonate, balling, sintering, ball milling, tempering and cooling. Firstly, the bonded permanent magnet ferrite production wastewater contains a large amount of strontium chloride; secondly, the pre-sintered material ball can be obtained after sintering, and the temperature of the pre-sintered material ball is usually 800-1000℃. In the conventional technology, the pre-sintered material ball is cooled by cooling water, and the heat energy obtained by the cooling water is only used for ordinary flushing, which is often abundant and causes waste. In the utility model, the heat energy exchange between the pre-sintered material ball and the cooling water can be realized through the self-designed heat exchange kiln, and the steam form is used for heating the concentrated wastewater, so that the strontium chloride in the production wastewater is concentrated and used reversely in the production of the bonded permanent magnet ferrite.

[0011] The working principle of the strontium chloride concentration and recovery device is that the pre-sintered material ball after sintering is introduced into the kiln body of the heat exchange kiln, and under the action of self-rotation and spiral guide plate, the pre-sintered material ball is transported from the feeding port to the discharging port. At the same time, the segmented water cooling component outside the kiln body is passed through the cooling water; in the above conveying process, the heat energy of the pre-sintered material ball is absorbed by the cooling water, so as to be converted into hot water. After the hot water is heated by the steam generator, it is transported to the triple heat exchange and concentration device, and at the same time, the wastewater containing strontium chloride is also introduced into the triple heat exchange and concentration device. The wastewater is concentrated by steam heating, and finally the strontium chloride concentrated solution is obtained, which can be used for the production of the bonded permanent magnet ferrite.

[0012] As a preferred, the kiln body is arranged at an angle of 3-5° with the horizontal line, and is arranged on the support through the rotating bearing.

[0013] As a preferred, the kiln body is arranged at an angle of 3-5° with the horizontal line, and is arranged on the support through the rotating bearing.

[0014] As a preferred, the kiln body is arranged at an angle of 3-5° with the horizontal line, and is arranged on the support through the rotating bearing.

[0015] As a preferred, the cross section of the preheating pipe section and the heating pipe section is semicircular.

[0016] As a preferred, the pipe diameter ratio of the preheating pipe section and the heating pipe section is 1.5-2:1, and the coil number ratio per unit kiln body length is 2-3 turns per 10cm2. The above design ratio is to increase the water flow rate in the pipeline and improve the heat exchange effect.

[0017] As a preference, the pipe diameter of the heating pipe section decreases along the water flow direction.

[0018] As a preference, the triple heat exchange concentration device comprises a first heat exchange concentration device, a second heat exchange concentration device and a third heat exchange concentration device connected in series.

[0019] As a preference, each heat exchange concentration device comprises a vertical wastewater container and a steam chamber wrapped outside the wastewater container; the top and bottom of the wastewater container are respectively provided with a wastewater inlet and a wastewater outlet; the top of the steam chamber is provided with a steam inlet and a condensate outlet, and the bottom of the steam chamber is provided with a steam outlet; the wastewater outlet of a previous heat exchange concentration device is communicated with the wastewater inlet of a subsequent heat exchange concentration device; the steam outlet and the condensate outlet of the previous heat exchange concentration device are communicated with the steam inlet of the subsequent heat exchange concentration device.

[0020] For further more efficient recovery of heat energy, the wastewater concentration is divided into three-stage evaporation: the first stage uses the first steam generated by the heat exchange kiln to heat, and the wastewater is concentrated to 40-60% of the original volume; the second stage uses the second steam generated by the wastewater concentration in the first stage to heat and the condensed hot water of the first steam to heat, and the wastewater is concentrated to 20-30% of the original volume; the third stage uses the third steam generated by the wastewater concentration in the second stage to heat, and the wastewater is concentrated to the target concentration. The scheme can reduce the equipment pressure, and the heating uniformity of the steam is good, which can ensure the uniform heating in the concentration process, and the three-time concentration can better utilize the waste heat.

[0021] Compared with the prior art, the beneficial effects of the utility model are:

[0022] (1) The device of the utility model can realize the concentration and recovery of strontium chloride in the production wastewater of bonded permanent magnet ferrite, and the obtained strontium chloride recovery solution can be repeatedly used for the preparation of bonded permanent magnet ferrite, so that the utilization rate of strontium resources can be significantly improved, the waste of strontium resources can be effectively reduced, and the cost can be greatly reduced.

[0023] (2) The steam used for the concentration and recovery of strontium chloride in the utility model comes from the production process of bonded permanent magnet ferrite, and the full utilization of heat energy can be realized. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1The figure is a schematic diagram of the connection of the strontium chloride concentration recovery device.

[0025] Figure 2 The figure is a schematic diagram of the structure of the heat exchange kiln.

[0026] Figure 3 The figure is a schematic diagram of the cross-section of the heat exchange kiln.

[0027] Figure 4 The figure is a schematic diagram of the water inlet of the sectional water cooling component.

[0028] Figure 5 The figure is a schematic diagram of the structure of the single heat exchange concentration device.

[0029] Figure 6 The figure is a schematic diagram of the cross-section of the single heat exchange concentration device.

[0030] In the figure: 1 heat exchange kiln, 2 steam generator, 3 first heat exchange concentration device, 4 second heat exchange concentration device, 5 third heat exchange concentration device, 1-1 rotating bearing, 1-2 support, 1-3 kiln body, 1-3-1 spiral guide plate, 1-4 feed inlet, 1-5 discharge outlet, 1-6 sectional water cooling component, 1-6-1 preheating pipe section, 1-6-2 heating pipe section, 1-6-3 water inlet, 1-6-4 water inlet pipe, 1-6-5 water outlet, 3-1 waste water cavity, 3-2 steam cavity, 3-3 waste water inlet, 3-4 waste water outlet, 3-5 steam inlet, 3-6 condensate water outlet, 3-7 steam outlet. DETAILED DESCRIPTION

[0031] The utility model will be further described below in combination with examples.

[0032] Overall example

[0033] A strontium chloride concentration recovery device, which comprises a heat exchange kiln, a steam generator and a triple heat exchange concentration device.

[0034] The heat exchange kiln comprises a kiln body arranged transversely and capable of rotating, the kiln body has a feed inlet and a discharge outlet at two ends respectively, the kiln body is internally provided with a spiral guide plate, and the kiln body is externally wound with a sectional water cooling component.

[0035] The two interfaces of the steam generator are connected with the water inlets and outlets of the sectional water cooling component respectively to realize the collection of hot water and the conversion of steam and the supply of cooling water (to the sectional water cooling component).

[0036] The triple heat exchange concentration device is communicated with the steam generator to realize the delivery of steam to the triple heat exchange concentration device.

[0037] In some preferred embodiments, the kiln body is arranged at an angle of 3-5° with the horizontal line and is placed on the support through a rotating bearing.

[0038] In some preferred embodiments, the kiln body is provided with a feed inlet at the lower end of the horizontal position and a discharge outlet at the upper end of the horizontal position; the water flow direction of the sectional water cooling component is opposite to the material flow direction in the kiln body. The cooling water moves downward in a spiral from top to bottom in the horizontal reference system, while the direction of the pre-fired material balls is opposite, so the spiral guide plate arrangement is counterclockwise relative to the preheating pipe section and the heating pipe section outside the coiled kiln body.

[0039] In some preferred embodiments, the sectional water cooling component includes, from high to low in the horizontal position of the kiln body, a preheating pipe section and a heating pipe section; the preheating pipe section is provided with a water inlet connected to the steam generator through a water inlet pipe; the heating pipe section is provided with a water outlet connected to the steam generator.

[0040] In some preferred embodiments, the cross section of the preheating pipe section and the heating pipe section is semicircular.

[0041] In some preferred embodiments, the pipe diameter ratio of the preheating pipe section and the heating pipe section is 1.5-2:1, and the number of coiled turns per 10 cm of kiln body length is 2-3 turns. The above design ratio is to increase the water flow rate in the pipe and improve the heat exchange effect.

[0042] In some preferred embodiments, the pipe diameter of the heating pipe section decreases with the water flow direction.

[0043] In some preferred embodiments, the triple heat exchange concentration device includes a first heat exchange concentration device, a second heat exchange concentration device and a third heat exchange concentration device connected in series.

[0044] In some preferred embodiments, each heat exchange concentration device includes a vertical wastewater container cavity and a steam cavity wrapped outside the wastewater container cavity; the top and bottom of the wastewater container cavity are respectively provided with a wastewater inlet and a wastewater outlet; the top of the steam cavity is provided with a steam inlet and a condensate outlet, and the bottom is provided with a steam outlet; the wastewater outlet of the previous heat exchange concentration device is connected to the wastewater inlet of the subsequent heat exchange concentration device; the steam outlet and the condensate outlet of the previous heat exchange concentration device are connected to the steam inlet of the subsequent heat exchange concentration device. Specific embodiments

[0046] Example 1

[0047] A strontium chloride concentration and recovery device, as shown in Figure 1 , includes a heat exchange kiln 1, a steam generator 2 and a triple heat exchange concentration device. Among them:

[0048] As shown in Figures 2-4As shown, the heat exchange kiln comprises a kiln body 1-3 arranged transversely and rotatable, a spiral material guide plate 1-3-1 arranged inside the kiln body, and a segmented water cooling component 1-6 wound outside the kiln body. Specifically, the kiln body is arranged at an angle of 4° with the horizontal line and is placed on a support 1-2 through a rotating bearing 1-1. The kiln body is provided with a feed inlet 1-4 at the lower end in the horizontal position and a discharge outlet 1-5 at the higher end in the horizontal position; the water flow direction of the segmented water cooling component is opposite to the material flow direction in the kiln body. More specifically, the segmented water cooling component comprises a preheating pipe segment 1-6-1 and a heating pipe segment 1-6-2 from high to low in the horizontal position of the kiln body; the preheating pipe segment is provided with a water inlet 1-6-3, and the water inlet is communicated with a steam generator through a water inlet pipe 1-6-4; the heating pipe segment is provided with a water outlet 1-6-5 connected with the steam generator. The cooling water moves downward in a spiral from top to bottom in the horizontal reference system, while the direction of the pre-burning material ball is opposite, so the spiral material guide plate is arranged in a reverse spiral relative to the preheating pipe segment and the heating pipe segment wound outside the kiln body. In addition, in this embodiment, the cross sections of the preheating pipe segment and the heating pipe segment are designed as semicircles; the pipe diameter ratio of the preheating pipe segment to the heating pipe segment is 1.5:1, and the winding number ratio per unit kiln body length is 2 turns per 10 cm. The above design ratio is to increase the water flow rate in the pipe and improve the heat exchange effect; further, the pipe diameter of the heating pipe segment decreases with the water flow direction.

[0049] The two interfaces of the steam generator are connected with the water inlet and the water outlet of the segmented water cooling component respectively to realize the supply of cooling water (to the segmented water cooling component) and the recovery of steam.

[0050] As shown in Figure 1 and Figures 5-6 The triple heat exchange concentration device is communicated with the steam generator to realize the delivery of steam to the triple heat exchange concentration device. Specifically, the triple heat exchange concentration device comprises a first heat exchange concentration device 3, a second heat exchange concentration device 4 and a third heat exchange concentration device 5 connected in series. Each heat exchange concentration device comprises a vertical wastewater container cavity 3-1 and a steam cavity 3-2 wrapped outside the wastewater container cavity; the top and the bottom of the wastewater container cavity are respectively provided with a wastewater inlet 3-3 and a wastewater outlet 3-4; the top of the steam cavity is provided with a steam inlet 3-5 and a condensate outlet 3-6, and the bottom is provided with a steam outlet 3-7; the wastewater outlet of the previous heat exchange concentration device is communicated with the wastewater inlet of the subsequent heat exchange concentration device; the steam outlet and the condensate outlet of the previous heat exchange concentration device are communicated with the steam inlet of the subsequent heat exchange concentration device.

[0051] The working principle of the strontium chloride concentration and recovery device is as follows: the pre-sintered material balls after sintering are introduced into the kiln body of the heat exchange kiln, and under the action of self-rotation and the spiral guide plate, the pre-sintered material balls are transported from the feeding port to the discharging port. At the same time, cooling water flows in the segmented water cooling component outside the kiln body; during the above transportation process, the heat energy of the pre-sintered material balls is absorbed by the cooling water, thereby being converted into steam. After the steam is separated by the steam generator, pure steam is input into the triple heat exchange concentration device, and at the same time, wastewater containing strontium chloride is also input into the triple heat exchange concentration device. The wastewater is concentrated by steam heating, and finally strontium chloride concentrated solution is obtained, which can be used for the production of bonded permanent ferrite.

[0052] In addition, the triple heat exchange concentration device divides the wastewater concentration into three stages of evaporation, which can further more efficiently recover heat energy: the first stage uses the first steam generated by the heat exchange kiln to heat and concentrate the wastewater to 40-60% of the original volume; the second stage uses the second steam generated by the first stage of wastewater concentration and the heat of the condensed water generated by the first steam to heat and concentrate the wastewater to 20-30% of the original volume; the third stage uses the third steam generated by the second stage of wastewater concentration to heat and concentrate the wastewater to the target concentration. This scheme can reduce the pressure of the equipment, and the heating uniformity of the steam is good, which can ensure the uniform heating of the concentration process, and the concentration is divided into three times, which can better utilize the waste heat.

[0053] Example 2

[0054] As shown in Figure 1 and Figures 5-6 , the strontium chloride concentration and recovery device of example 1 is applied to the concentration and recovery of strontium chloride in bonded permanent ferrite production wastewater, and the main steps are as follows:

[0055] (1) 1 volume of bonded permanent ferrite production wastewater with a strontium chloride mass concentration of 3% is introduced into the wastewater cavity 3-1 of the first heat exchange concentration device 3, and is concentrated by evaporation to obtain concentrated liquid A and second steam after 0.5 volumes; the first heat exchange concentration device 3 is heated by the first steam, and the first steam is heated by the heat exchange kiln 1, specifically, the hot water of the heat exchange kiln 1 enters the steam generator 2 to generate steam, and the steam enters the steam cavity 3-2 from the steam inlet 3-5 to heat the wastewater cavity 3-1; the first steam temperature is 120℃, and the second steam temperature is 95℃; the impurity metal content of the bonded permanent ferrite production wastewater is 0.12%.

[0056] (2) Concentrated liquid A is introduced into the wastewater cavity of the second heat exchange concentration device 4, and the second heat exchange concentration device 4 is heated by the second steam. Specifically, the hot water in the wastewater cavity 3-1 of the first heat exchange concentration device 3 flows out of the condensate outlet 3-6 and mixes with the steam flowing out of the steam outlet 3-7, and then enters the steam cavity 3-2 of the second heat exchange concentration device. After concentrated liquid A is concentrated to 0.25 volume, concentrated liquid B and third steam are obtained, and the temperature of the third steam is 75°C.

[0057] (3) Concentrated liquid B is introduced into the wastewater cavity of the third heat exchange concentration device 5, and the third heat exchange concentration device 5 is heated by the third steam. Specifically, the hot water in the wastewater cavity 3-1 of the second heat exchange concentration device 3 flows out of the condensate outlet 3-6 and mixes with the steam flowing out of the steam outlet 3-7, and then enters the steam cavity 3-2 of the third heat exchange concentration device. After concentrated liquid B is concentrated to a strontium chloride solution mass concentration of 18%, a strontium chloride recovery solution is obtained; the impurity metal content of the strontium chloride recovery solution is 0.16%.

[0058] As shown in Figures 2-4 The heat exchange kiln 1 includes a kiln body 1-3 placed on a support 1-2 through a rotating bearing 1-1 at an angle of 4° with the horizontal line. The kiln body 1-3 is provided with a spiral guide plate 1-3-1. The lower end of the horizontal position of the kiln body 1-3 is provided with a feeding port 1-4, and the higher end of the horizontal position of the kiln body 1-3 is provided with a discharging port 1-5. The outer surface of the kiln body 1-3 is fixedly coiled with a segmented water cooling component 1-6. The segmented water cooling component 1-6 includes a preheating pipe segment 1-6-1 and a heating pipe segment 1-6-2 coiled on the outer side of the kiln body 1-3 from high to low according to the horizontal position of the kiln body. The preheating pipe segment 1-6-1 is provided with a water inlet 1-6-3, and the water inlet 1-6-3 is communicated with a steam generator 2 through a water inlet pipe 1-6-4. The steam generator 2 is connected with the first heat exchange concentration device 1 of step (b-1). The first heat exchange concentration device 3, the second heat exchange concentration device 4, and the third heat exchange concentration device 5 have similar basic structural principles. The cross section of the preheating pipe segment 1-6-1 and the heating pipe segment 1-6-2 is semicircular. The pipe diameter ratio of the preheating pipe segment 1-6-1 and the heating pipe segment 1-6-2 is 1.5:1, and the coiling number per unit kiln body length is 2 per 10 cm. In the segmented water cooling component 1-6, the heating pipe segment 1-6-2 is densely arranged in the direction of water flow with a decreasing diameter, in order to improve the heat exchange efficiency. The cooling water moves downward in a spiral from top to bottom in the horizontal reference system, while the direction of the pre-burning material ball is opposite. Therefore, the spiral guide plate 1-3-1 is arranged in an anti-spiral relative to the cooling water of the preheating pipe segment 1-6-1 and the heating pipe segment 1-6-2 coiled on the outer side of the kiln body. The pre-burning material ball is cooled and then enters the next process from the discharging port.

[0059] Example 3

[0060] The application relates to a strontium chloride concentration recovery device which comprises a heat exchange kiln, a steam generator and a triple heat exchange concentration device.

[0061] The heat exchange kiln comprises a kiln body which is horizontally arranged and can rotate, the inside of the kiln body is provided with a spiral material guide plate, and a segmented water cooling component is coiled outside the kiln body. Specifically, the kiln body is arranged at an angle of 3 with the horizontal line and is arranged on a support through a rotating bearing. The lower end of the horizontal position of the kiln body is provided with a feeding port, and the higher end of the horizontal position of the kiln body is provided with a discharging port; the water flow direction of the segmented water cooling component is opposite to the material flow direction in the kiln body. More specifically, the segmented water cooling component comprises a preheating pipe section and a heating pipe section from high to low according to the horizontal position of the kiln body; the preheating pipe section is provided with a water inlet which is communicated with the steam generator through a water inlet pipe; and the heating pipe section is provided with a water outlet which is connected with the steam generator. The cooling water moves spirally from top to bottom in the horizontal reference system, and the direction of the pre-burning material ball is opposite, so that the spiral material guide plate is arranged reversely to the preheating pipe section and the heating pipe section which are coiled outside the kiln body. In addition, in the embodiment, the cross sections of the preheating pipe section and the heating pipe section are designed as semicircles; the pipe diameter ratio of the preheating pipe section and the heating pipe section is 2:1, and the coiling number ratio per unit kiln body length is 3 per 10 cm. The above design ratio is to increase the water flow rate in the pipeline and improve the heat exchange effect; further, the pipe diameter of the heating pipe section decreases along the water flow direction.

[0062] The two interfaces of the steam generator are connected with the water inlet and the water outlet of the segmented water cooling component respectively, so that the supply of the cooling water (to the segmented water cooling component) and the recovery of the steam are realized.

[0063] The triple heat exchange concentration device is communicated with the steam generator, so that the steam is delivered to the triple heat exchange concentration device. Specifically, the triple heat exchange concentration device comprises a first heat exchange concentration device, a second heat exchange concentration device and a third heat exchange concentration device which are sequentially connected in series. Each heat exchange concentration device comprises a vertical waste water container cavity and a steam cavity which is wrapped outside the waste water container cavity; the top and the bottom of the waste water container cavity are respectively provided with a waste water inlet and a waste water outlet; the top of the steam cavity is provided with a steam inlet and a condensate water outlet, and the bottom of the steam cavity is provided with a steam outlet; the waste water outlet of the previous heat exchange concentration device is communicated with the waste water inlet of the subsequent heat exchange concentration device; and the steam outlet and the condensate water outlet of the previous heat exchange concentration device are communicated with the steam inlet of the subsequent heat exchange concentration device.

[0064] Embodiment 4

[0065] The application relates to a strontium chloride concentration recovery device which comprises a heat exchange kiln, a steam generator and a triple heat exchange concentration device. Wherein:

[0066] The heat exchange kiln comprises a kiln body arranged transversely and rotatable, a spiral material guide plate arranged inside the kiln body, and a segmented water cooling component wound outside the kiln body. Specifically, the kiln body is arranged at an angle of 5° with the horizontal line and is arranged on a support through a rotating bearing. The lower end of the horizontal position of the kiln body is provided with a feeding port, and the higher end of the horizontal position of the kiln body is provided with a discharging port. The water flow direction of the segmented water cooling component is opposite to the material flow direction in the kiln body. More specifically, the segmented water cooling component comprises a preheating pipe section and a heating pipe section from high to low in the horizontal position of the kiln body. The preheating pipe section is provided with a water inlet, and the water inlet is communicated with a steam generator through a water inlet pipe. The heating pipe section is provided with a water outlet connected with the steam generator. The cooling water moves downward in a spiral manner in the horizontal reference system, and the direction of the pre-burning material ball is opposite, so that the spiral material guide plate is arranged in a reverse spiral relative to the preheating pipe section and the heating pipe section wound outside the kiln body. In addition, in the embodiment, the cross sections of the preheating pipe section and the heating pipe section are designed as semicircles. The pipe diameter ratio of the preheating pipe section to the heating pipe section is 1.75:1, and the winding number ratio per unit kiln body length is 2.5 turns per 10 cm. Further, the pipe diameter of the heating pipe section decreases along the water flow direction.

[0067] The two interfaces of the steam generator are connected with the water inlet and the water outlet of the segmented water cooling component, so as to realize the supply of cooling water (to the segmented water cooling component) and the recovery of steam.

[0068] The triple heat exchange concentration device is communicated with the steam generator, so as to realize the delivery of steam to the triple heat exchange concentration device. Specifically, the triple heat exchange concentration device comprises a first heat exchange concentration device, a second heat exchange concentration device and a third heat exchange concentration device connected in sequence. Each heat exchange concentration device comprises a vertical wastewater container cavity and a steam cavity wrapped outside the wastewater container cavity. The top and the bottom of the wastewater container cavity are respectively provided with a wastewater inlet and a wastewater outlet. The top of the steam cavity is provided with a steam inlet and a condensate outlet, and the bottom of the steam cavity is provided with a steam outlet. The wastewater outlet of the previous heat exchange concentration device is communicated with the wastewater inlet of the subsequent heat exchange concentration device. The steam outlet and the condensate outlet of the previous heat exchange concentration device are communicated with the steam inlet of the subsequent heat exchange concentration device.

[0069] The raw materials and equipment used in the utility model are the commonly used raw materials and equipment in the field, unless otherwise specified. The methods used in the utility model are the conventional methods in the field, unless otherwise specified.

[0070] The above description is only a preferred embodiment of the utility model, and does not limit the utility model. Any simple modification, change and equivalent transformation of the above embodiment according to the technical essence of the utility model still belong to the protection scope of the technical scheme of the utility model.

Claims

1. A device for concentrating and recovering strontium chloride from wastewater, characterized by The application relates to a heat-exchange kiln, a steam generator and a triple heat-exchange concentration device. The heat-exchange kiln comprises a kiln body arranged transversely and rotatable, a feeding port and a discharging port arranged at two ends of the kiln body respectively, a spiral material guide plate arranged in the kiln body, and a segmented water cooling component wound outside the kiln body. The steam generator is connected with the water inlet and the water outlet of the segmented water cooling component. The triple heat-exchange concentration device is communicated with the steam generator.

2. The apparatus for concentrating and recovering strontium chloride in wastewater according to claim 1, characterized by: The kiln body is arranged at an angle of 3-5 degrees with the horizontal line and is arranged on a support through a rotating bearing.

3. The device for concentrating and recovering strontium chloride in wastewater according to claim 2, wherein: The feeding port is arranged at the lower end of the horizontal position of the kiln body, and the discharging port is arranged at the higher end of the horizontal position of the kiln body. The water flow direction of the segmented water cooling component is opposite to the material flow direction in the kiln body.

4. The apparatus for concentrating and recovering strontium chloride in wastewater according to claim 3, characterized by: The segmented water cooling component comprises a preheating pipe section and a heating pipe section from high to low according to the horizontal position of the kiln body.

5. The apparatus for concentrating and recovering strontium chloride in wastewater according to claim 4, characterized by: The preheating pipe section is provided with a water inlet communicated with the steam generator through a water inlet pipe.

6. The apparatus for concentrating and recovering strontium chloride in wastewater according to claim 4, characterized by: The cross section of the preheating pipe section and the heating pipe section is semicircular.

7. The apparatus for concentrating and recovering strontium chloride in wastewater according to claim 4, characterized by: The pipe diameter ratio of the preheating pipe section and the heating pipe section is 1.5-2:1, and the coil number ratio per unit kiln body length is 2-3 coils per 10 cm.

8. The apparatus for concentrating and recovering strontium chloride in wastewater according to claim 1, characterized by: The pipe diameter of the heating pipe section decreases along the water flow direction. The triple heat-exchange concentration device comprises a first heat-exchange concentration device, a second heat-exchange concentration device and a third heat-exchange concentration device connected in sequence.

9. The device for concentrating and recovering strontium chloride in wastewater according to claim 8, wherein: Each heat-exchange concentration device comprises a vertical wastewater container and a steam chamber wrapped outside the wastewater container. The top and the bottom of the wastewater container are respectively provided with a wastewater inlet and a wastewater outlet. The top of the steam chamber is provided with a steam inlet and a condensate outlet, and the bottom is provided with a steam outlet. The wastewater outlet of the previous heat-exchange concentration device is communicated with the wastewater inlet of the subsequent heat-exchange concentration device. The steam outlet and the condensate outlet of the previous heat-exchange concentration device are communicated with the steam inlet of the subsequent heat-exchange concentration device.

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