Cobaltous sulfate evaporative crystallization equipment and process

A technology of evaporative crystallization and cobalt sulfate, applied in the direction of cobalt sulfate, solution crystallization, crystallization device general layout, etc., can solve the problems of high equipment investment cost, steam consumption, low production efficiency, etc., and reduce energy consumption, energy consumption, etc. The effect of low consumption and simple process steps

Inactive Publication Date: 2018-09-25
SHENZHEN SUNEVAP TECH
5 Cites 3 Cited by

AI-Extracted Technical Summary

Problems solved by technology

[0003] At present, cobalt sulfate is usually prepared by the process of evaporation concentration-cooling crystallization. In the traditional evaporation crystallization process, the evaporation process is mostly carried out by single-effect or multi-effect evaporation. Among them, the secondary steam of single-effect evaporation or the last stage of multi-effect evaporation The st...
View more

Abstract

The invention discloses cobaltous sulfate evaporative crystallization equipment. The cobaltous sulfate evaporative crystallization equipment comprises a stock solution preheating system, an evaporative concentration system, a cooling and crystallizing system and a filtering-separating system which are sequentially connected, and further comprises a control mechanism. The equipment automatically processes the cobaltous sulfate stock solution at each workshop stage of the stock solution preheating system, the evaporative concentration system, the cooling and crystallizing system and the filtering-separating system, is used for directly evaporating and crystallizing the cobaltous sulfate solution to prepare cobalt monosulfate heptahydrate, is production equipment with high degree of automation, is high in production efficiency, is simple in equipment structure, is small in floor space, is low in investment cost, is free of damage to environment, and is low-energy-consumption environment-friendly type production equipment. The invention further discloses an evaporative crystallization process, wherein the cobaltous sulfate solution is evaporated and concentrated after being pre-heated,is then cooled and crystallized to obtain a product, and the product is finally filtered and separated. The process is simple in step, is low in energy consumption, is low in production cost, and isan MVR evaporation technology in comparison with a conventional process, so that consumption of energy is further reduced.

Application Domain

Cobalt sulfatesSolution crystallization +1

Technology Topic

ChemistryCobaltous sulfate +7

Image

  • Cobaltous sulfate evaporative crystallization equipment and process

Examples

  • Experimental program(3)

Example Embodiment

[0026] Example 1
[0027] This embodiment provides a cobalt sulfate evaporation crystallization device, which is a device that uses MVR technology to directly prepare cobalt sulfate heptahydrate crystals from cobalt sulfate solution. The device is such as figure 1 As shown, it includes a raw liquid preheating system, an evaporation concentration system, a cooling crystallization system, and a filtration separation system connected in sequence, and also includes a control signal connection with the raw liquid preheating system, evaporation concentration system, cooling crystallization system, and filtration separation system. The control mechanism is a PLC, and the control mechanism is used to control the automatic processing process of the raw liquid preheating system, the evaporation concentration system, the cooling crystallization system, and the filtration separation system. All input and output signals can be controlled by a computer with PLC control software. carry out.
[0028] Specifically, the raw liquid preheating system includes a raw liquid storage tank 1, a distilled water preheater 2 and a fresh steam preheater 3 which are sequentially connected by pipelines, and the raw liquid storage tank 1 and the distilled water preheater 2 A raw liquid pump 4 is provided in the raw liquid storage tank 1, and the raw liquid storage tank 1 is filled with cobalt sulfate solution. The raw liquid pump 4 sequentially pumps the cobalt sulfate solution in the raw liquid storage tank 1 into the distilled water preheater 2 and the fresh steam preheater 3 , Exchange heat with the distilled water in the distilled water preheater 2 and the fresh steam in the fresh steam preheater 3. Wherein, the fresh steam preheater 3 is connected to the evaporation concentration system, and the distilled water preheater 2 is also connected to a distilled water storage tank 6 through a distilled water pump 5. The fresh steam preheater 3 is also connected to a non-condensable gas condenser 20 through a pipeline, and the non-condensable gas condenser 20 is connected to a vacuum pump 21.
[0029] The evaporative concentration system includes a gas-liquid separator 7 and a forced circulation heat exchanger 8 connected through a pipeline. The gas-liquid separator 7 and the fresh steam preheater 3 are connected through a pipeline and are preheated by fresh steam. The cobalt sulfate preheated by the fresh steam in the reactor enters the gas-liquid separator 7 for flash evaporation and concentration. The gas-liquid separator 7 is also connected to a secondary separator 9 through a pipeline, and the secondary separator 9 passes through A steam compressor 10 is connected to the pipeline, and the steam compressor 10 is connected to the forced circulation heat exchanger 8 at the same time. Further, the steam compressor 10 is also connected to a liquid accumulation tank 11, and the liquid accumulation tank 11 is connected with Effusion pump 19. A forced circulation pump 12 is also connected to the bottom of the forced circulation heat exchanger 8. The forced circulation pump 12 is connected to the gas-liquid separator 7 through a pipeline for pumping the concentrated liquid produced in the gas-liquid separator 7 into the forced The circulating heat exchanger 8 circulates and concentrates.
[0030] The cooling and crystallization system includes a first enamel cooling kettle 13 and a second enamel cooling kettle 14 connected by pipelines. The gas-liquid separator 7 is connected to the first enamel cooling kettle 13 and the second enamel cooling kettle 13 through a discharge pump 15 The enamel cooling kettle 14 is connected, and the first enamel cooling kettle 13 and the second enamel cooling kettle 14 cool the saturated cobalt sulfate solution to obtain cobalt sulfate heptahydrate crystals and its low-temperature saturated mother liquor.
[0031] The filtration and separation system includes a piston pushing centrifuge 16. The first enamel cooling kettle 13 and the second enamel cooling kettle 14 are connected to the piston pushing centrifuge 16, and the piston pushing centrifuge 16 passes through a pipeline. A mother liquor tank 17 for storing the filtrate filtered by the piston push centrifuge 16 is connected. The piston pushing centrifuge 16 has a piston pusher. After the mother liquor containing crystallization in the first enamel cooling kettle 13 and the second enamel cooling kettle 14 enters the piston pushing centrifuge 16, it will move along the piston pushing centrifuge 16. The inner wall of the conical feeding hopper flows to the filter screen of the rotating drum, and the filtrate is continuously discharged through the filter screen through the filtrate outlet, and the filter residue accumulated on the inner surface of the filter screen is pushed out along the inner wall of the rotating drum by the reciprocating piston pusher. The filtrate is stored in the mother liquor tank 17, and is connected to the raw liquor storage tank 1 through the mother liquor pump 18, so that the mother liquor is mixed with the raw liquor, after preheating, it is evaporated and concentrated again and cooled and crystallized.

Example Embodiment

[0032] Example 2
[0033] This embodiment provides a process for evaporative crystallization using the cobalt sulfate evaporative crystallization equipment described in Embodiment 1, which includes the following steps:
[0034] S1. Preheating the stock solution. The cobalt sulfate solution is heated to the evaporation temperature through the stock solution preheating system, and the cobalt sulfate stock solution stored in the stock solution storage tank 1 is sequentially injected into the distilled water preheater 2 and the fresh steam preheater 3 by the stock solution pump 4 , Sequentially heat exchange with the distilled water and fresh steam in each preheater to reach the evaporation temperature of the cobalt sulfate solution 93°C. The distilled water is the secondary steam condensed water obtained by evaporation of the distilled water in the distilled water storage tank 6. The fresh steam is saturated steam with a pressure of 0.1MpaG and a temperature of 120°C.
[0035] S2. Evaporation and concentration. The preheated cobalt sulfate solution enters the evaporation concentration system. After the temperature is raised and pressured, it is flashed and concentrated to obtain a cobalt sulfate solution with a concentration close to saturation and secondary steam. Specifically, the preheated cobalt sulfate solution enters the gas In the liquid separator 7, and under the action of the forced circulation pump 12, it enters the forced circulation heat exchanger 8 to raise the temperature and pressure, and then enters the gas-liquid separator 7 for flash evaporation and concentration. The concentrated liquid after gas-liquid separation is forced Under the action of the circulation pump 12 and gravity, it enters the forced circulation heat exchanger 8 again, and then enters the gas-liquid separator 7 again for concentration and flash evaporation after the temperature rises. The above process is cyclically carried out. The gas-liquid separator 7 provides a slight load of 70.1KPa. Pressure. After crystallization and separation, the secondary steam with a temperature of 85°C and a pressure of 57.8KPa will enter the secondary separator 9 after defoaming at the top of the gas-liquid separator, and the secondary steam will enter the steam after further gas-liquid separation. Compressor 10 obtains high-temperature and high-pressure steam with a temperature of 105°C and a pressure of 120.8KPa after compression. The high-temperature and high-pressure steam is reused in the forced circulation heat exchanger 8 to heat the material. In the process of heating the material, the high-temperature and high-pressure steam is condensed into water. The distilled water storage tank 6 is sent to the distilled water preheater 2 by the distilled water pump 5 to exchange heat with the raw material liquid, and is discharged out of the system after being cooled to 35°C. The steam compressor 10 is connected with a large secondary steam pipeline, and the condensed liquid remaining in the large pipeline flows to the liquid accumulation tank 11 during the startup process, and is sent to the distilled water storage tank 6 by the liquid accumulation pump 19, and is sent out of the system by the distilled water pump 5.
[0036] S3. Cooling and crystallization. The nearly saturated cobalt sulfate solution after evaporation and concentration is cooled by a cooling crystallization system. The temperature is reduced, and the cobalt sulfate heptahydrate crystals are saturated and precipitated. The cobalt sulfate solution in the gas-liquid separator 7 is concentrated by continuous evaporation and concentration. The saturated solution is sent to the first enamel cooling kettle 13 and the second enamel cooling kettle 14 by the discharge pump 15 after observing the density through the mass flowmeter. The two enamel cooling kettles are operated alternately, and the first enamel cooling kettle 13 and the second enamel cooling kettle are operated alternately. Cooling water with a temperature of about 25°C is passed into the jacket of the enamel cooling kettle 14, and the cobalt sulfate solution is gradually cooled to about 40°C. At this time, the solubility of cobalt sulfate decreases and cobalt sulfate heptahydrate crystals are precipitated to obtain cobalt sulfate heptahydrate. Crystal and its low temperature saturated mother liquor.
[0037] S4. Filtration and separation. The cooled and crystallized cobalt sulfate heptahydrate crystals are passed through the filtration separation system. The cooled solution containing cobalt sulfate heptahydrate crystals is centrifuged through the filtration separation system to obtain filtrate and cobalt sulfate heptahydrate crystals, and the filtrate is returned to The evaporative concentration system evaporates and concentrates again. The cobalt sulfate heptahydrate crystal grains produced by cooling and crystallization continuously grow in the first enamel cooling kettle 13 and the second enamel cooling kettle 14, and then the solution containing cobalt sulfate heptahydrate crystals and its low-temperature saturated mother liquor passes through the tube The path enters the piston pushing centrifuge 16, and flows along the inner wall of the cone feeding hopper of the piston pushing centrifuge 16 to the filter screen of the rotating drum. The filtrate is continuously discharged through the filter screen through the filtrate outlet, and the filter residue accumulated on the inner surface of the filter screen is pushed out along the inner wall of the drum by the reciprocating piston pusher, thereby separating the cobalt sulfate heptahydrate crystals and the low-temperature saturated mother liquor. The cobalt sulfate heptahydrate crystals are packaged and sent out of the system. The low-temperature saturated mother liquor flows out of the filtrate outlet of the piston pushing centrifuge 16, and flows into the connected mother liquid tank 17 through the pipeline, and then is transported to the connected raw liquid storage tank 1 through the mother liquid pump 18. After the mother liquor and the original liquor are mixed, the preheating is carried out again for evaporation and concentration and cooling and crystallization.

Example Embodiment

[0038] Experimental example
[0039] The processing capacity and operating energy consumption of the acid cobalt evaporation crystallization equipment described in Example 1 were tested, and the results are shown in Table 1:
[0040] Table 1
[0041] Serial number
[0042] The above test results show that the evaporation crystallization device described in Example 1 has the advantages of low energy consumption, high output, simple process, small number of equipment, and low construction investment.

PUM

no PUM

Description & Claims & Application Information

We can also present the details of the Description, Claims and Application information to help users get a comprehensive understanding of the technical details of the patent, such as background art, summary of invention, brief description of drawings, description of embodiments, and other original content. On the other hand, users can also determine the specific scope of protection of the technology through the list of claims; as well as understand the changes in the life cycle of the technology with the presentation of the patent timeline. Login to view more.

Similar technology patents

Method for detecting relaxation time of carrier on optically activated deep level for mercury cadmium telluride material

InactiveCN101706428AOptimized design and performance improvementsThe process steps are simple
Owner:SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI

Classification and recommendation of technical efficacy words

  • The process steps are simple
  • reduce energy consumption

Preparation method of silver coated copper powder for electronic slurry

InactiveCN102328076ARaw material components are simpleThe process steps are simple
Owner:NINGBO GUANGBO NEW NANOMATERIALS STOCK

Method for preparing ordered coaxial structural micro and nano fibers

InactiveCN102443870AHigh degree of orderly arrangement of fibersThe process steps are simple
Owner:QINGDAO UNIV

Method for extracting and separating components of osmanthus flower or arabian jasmine flower

ActiveCN103695175AAvoid Enzyme BrowningThe process steps are simple
Owner:仙芝科技(福建)股份有限公司 +1

Apparatus and method for controlling fluid flow

InactiveUS6948697B2reduce energy consumptionincrease battery longevity
Owner:SLOAN VALVE COMPANY

Preparation method of high-strength hydrogel

InactiveCN103739861AThe preparation process takes a short timeReduce energy consumption
Owner:HENAN POLYTECHNIC UNIV

Catalyst for gas phase hydrogenation of acetic acid to prepare ethanol

Owner:DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI +1
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products