CN110975308B - Solution concentration method - Google Patents
Solution concentration method Download PDFInfo
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- CN110975308B CN110975308B CN201911199030.9A CN201911199030A CN110975308B CN 110975308 B CN110975308 B CN 110975308B CN 201911199030 A CN201911199030 A CN 201911199030A CN 110975308 B CN110975308 B CN 110975308B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
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- B01D1/30—Accessories for evaporators ; Constructional details thereof
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Abstract
The invention belongs to the technical field of copper smelting, and particularly relates to a solution concentration method. The density of the concentrated solution does not need to be monitored at regular time or on line, a radioactive densimeter measurement and control mode which can cause personal and environmental safety hazards and is high in price is completely abandoned, the investment cost of concentration equipment and manpower is greatly reduced, the concentration process is green and environment-friendly, equipment maintenance is simple and convenient, and economic benefits are greatly improved.
Description
Technical Field
The invention belongs to the technical field of copper smelting, and particularly relates to a solution concentration method.
Background
In the copper electrolysis process, the components of the electrolyte are continuously changed, the concentrations of impurities such as arsenic, antimony, bismuth, nickel and the like are higher and higher, and the concentration of sulfuric acid is gradually reduced, which is very unfavorable for the normal operation of the electrolysis process, so that the electrolyte needs to be purified. The electrolyte purification generally employs the following steps: extracting a part of electrolyte or waste electrolyte for evaporation and concentration, and cooling and crystallizing to obtain copper sulfateCrystallization (CuSO)4·5H2O) morphological output to obtain primary mother liquor enriched with impurities, and then carrying out impurity removal treatment on the primary mother liquor.
Wherein, the evaporation concentration is carried out by adopting a vacuum evaporator. The prior art generally uses a radioactive densitometer to measure the density of the concentrate to determine the evaporative concentration endpoint. However, the radioactive densitometer causes potential safety hazards to human bodies and production environment, and under the environment of high temperature and strong corrosivity, the service life of the radioactive densitometer is greatly shortened, the maintenance is difficult and the cost is high, so that the cost of an evaporation concentration link is high.
Disclosure of Invention
The invention aims to provide a solution concentration method which is low in cost and convenient and fast to maintain.
In order to realize the purpose, the invention adopts the technical scheme that: a method of concentrating a solution comprising the steps of:
step 1: obtaining water volume V to be evaporated and separated according to the concentration of the liquid to be concentrated and the target concentration of the concentrated liquid, setting a target temperature value of the concentrated liquid in the separation tank, obtaining saturated vapor pressure and water evaporation speed V of water at corresponding temperature, further setting a vacuum degree limit value, setting the capacity of the concentrated liquid in the separation tank, a liquid inlet speed and a liquid outlet speed, determining evaporation time t of the liquid to be concentrated, and enabling V to be equal to vt;
step 2: the liquid inlet regulating valve, the liquid outlet regulating valve and the vacuum pump are communicated with the inner cavity of the separation tank; and opening and adjusting the liquid inlet adjusting valve, the liquid outlet adjusting valve, the vacuum pump, the heat exchange medium inlet adjusting valve and the heat exchange medium outlet adjusting valve to enable the temperature value of the concentrated liquid in the separation tank, the vacuum degree in the tank, the liquid inlet speed and the liquid outlet speed to reach target limit values, and at the moment, the liquid inlet amount and the liquid outlet amount in unit time are consistent with the evaporation amount of water.
Compared with the prior art, the invention has the following technical effects: by adopting the method, the concentrated solution meeting the concentration requirement can be obtained as long as the reasonable concentration environment and the heating duration are set according to the concentration target, the temperature and the pressure in the concentration environment are kept stable, and the concentration time is ensured. The density of the concentrated solution does not need to be monitored regularly or on line, a radioactive densimeter measurement and control mode which can cause personal and environmental safety hazards and is high in price is completely abandoned, the investment cost of concentration equipment and manpower is greatly reduced, the concentration process is green and environment-friendly, the equipment maintenance is simple and convenient, and the economic benefit is greatly improved.
Drawings
The contents of the description and the references in the drawings are briefly described as follows:
FIG. 1 is a schematic of the present invention.
In the figure: 10. the system comprises a separation tank, 11, a liquid inlet adjusting valve, 12, a liquid outlet adjusting valve, 13, a circulating pump, 14, a hot concentrated liquid inlet pipe, 15, a hot concentrated liquid outlet pipe, 20, a heating part, 21, a heat exchange medium inlet adjusting valve, 22, a heat exchange medium outlet adjusting valve, 31, a negative pressure measuring instrument, 32, a negative pressure adjusting valve, 33, a vacuum pump, 41, a thermometer, 42, a liquid level meter, 43 and a demister.
Detailed Description
The following description of the embodiments of the present invention will be made in detail with reference to the accompanying drawings.
A method of concentrating a solution comprising the steps of:
step 1: obtaining water volume V to be evaporated and separated according to the concentration of the liquid to be concentrated and the target concentration of the concentrated solution, setting a target temperature value of the concentrated solution in the separation tank 10, obtaining saturated vapor pressure and water evaporation speed V of water at a corresponding temperature, further setting a vacuum degree limit value, setting the capacity of the concentrated solution in the separation tank 10, a liquid inlet speed and a liquid outlet speed, determining the evaporation time t of the liquid to be concentrated, and enabling V to be equal to vt;
step 2: the liquid inlet regulating valve 11, the liquid outlet regulating valve 12 and the vacuum pump 33 are communicated with the inner cavity of the separation tank 10; and opening and adjusting the liquid inlet adjusting valve 11, the liquid outlet adjusting valve 12, the vacuum pump 33, the heat exchange medium inlet adjusting valve 21 and the heat exchange medium outlet adjusting valve 22 to enable the temperature value of the concentrated liquid in the separation tank 10, the vacuum degree in the tank, the liquid inlet speed and the liquid outlet speed to reach target limit values, and at the moment, the liquid inlet amount and the liquid outlet amount in unit time are consistent with the evaporation amount of water.
In this way, during the specific implementation, after the reasonable concentration environment and the heating time are set by the technical personnel, the concentrated solution meeting the concentration requirement can be obtained only by maintaining the stability of the temperature and the pressure in the concentration environment and ensuring the concentration time of the concentrated solution by the operating personnel, the density of the concentrated solution does not need to be monitored regularly or on line, and the concentration operation is simplified.
In specific implementation, the method can further comprise the step 3: and (5) monitoring the temperature value of the liquid to be concentrated in the separation tank 10 and the vacuum degree in the tank, and returning to the step 2 if the temperature value exceeds the limit value.
The step 2 comprises the following steps:
step 21: maintaining the level of the liquid to be concentrated in the separation tank 10 at the tank level
Step 22: closing the liquid inlet regulating valve 11 and the liquid outlet regulating valve 12, starting the vacuum pump 33 to enable the vacuum degree in the separation tank 10 to meet the requirement of a limit value, and heating the liquid to be concentrated;
step 23: sampling at regular time to measure the concentration of the concentrated solution after the temperature of the solution to be concentrated in the separation tank 10 reaches a set target temperature;
step 24: when the concentrated solution sampled and measured reaches the target concentration, the liquid inlet regulating valve 11 and the liquid outlet regulating valve 12 are opened, and at the moment, the liquid inlet amount and the liquid outlet amount in the tank cavity of the separation tank 10 in unit time accord with the water evaporation amount.
In this embodiment, step 1 sets: the mass concentration of copper ions in the solution to be concentrated is 35X 10-3g/cm3The target concentration of the concentrated solution is 1.38-1.42 g/cm3The temperature limit value of the concentrated solution in the separation tank 10 is 70-90 ℃, the vacuum degree limit value is 60-73K/Pa, and the liquid inlet amount is 9cm3H, liquid output of 6cm3H is used as the reference value. In step 21, the liquid level of the liquid to be concentrated in the tank 10 is at the height of the tank 10
As shown in fig. 1, the heating unit for heating the liquid to be concentrated may be disposed at the tank body of the separation tank 10, and the heat exchange medium inlet regulating valve 21 and the heat exchange medium outlet regulating valve 22 are communicated with the heating chamber coated outside the separation tank 10. The heating unit for heating the liquid to be concentrated can also be arranged in the tank of the separation tank 10, and the heat exchange medium inlet regulating valve 21 and the heat exchange medium outlet regulating valve 22 are communicated with the pipeline arranged in the separation tank 10.
As shown in fig. 2, the heating unit for heating the liquid to be concentrated may be disposed outside the separation tank 10, the separation tank 10 is communicated with the heating portion 20 through a hot concentrated liquid inlet pipe 14 and a hot concentrated liquid outlet pipe 15, a circulation pump 13 is disposed on the hot concentrated liquid inlet pipe 14 and/or the hot concentrated liquid outlet pipe 15, and the circulation pump 13 provides power to drive the concentrated liquid to be transported or circularly flow in the heating portion 20, the hot concentrated liquid inlet pipe 14, the separation tank 10, and the hot concentrated liquid outlet pipe 15; the inlet liquid regulating valve 11 is located upstream of the heating part 20, and the outlet liquid regulating valve 12 is communicated with the hot concentrated liquid outlet pipe 15.
A demister 43 is arranged at a steam outlet on the separation tank 10, and the separated steam flows through the demister 43 and is discharged out of the tank body under the action of the vacuum pump 33; a negative pressure measuring instrument 31 and a negative pressure regulating valve 32 are arranged on a pipeline between the separating tank 10 and the vacuum pump 33; a thermometer 41 is arranged in the separating tank 10, and the bottom end of the thermometer 41 is positioned below the liquid level of the liquid to be concentrated; a liquid level meter 42 is arranged in the separation tank 10 or a window is arranged on the tank body of the separation tank 10 so as to observe the liquid level in the tank.
Claims (7)
1. A method of concentrating a solution comprising the steps of:
step 1: obtaining water volume V to be evaporated and separated according to the concentration of the liquid to be concentrated and the target concentration of the concentrated solution, setting a target temperature value of the concentrated solution in a separation tank (10), obtaining saturated vapor pressure and water evaporation speed V of water at corresponding temperature, further setting a vacuum degree limit value, setting the capacity, liquid inlet speed and liquid outlet speed of the concentrated solution in the separation tank (10), determining evaporation time duration t of the liquid to be concentrated, and enabling V to be equal to vt;
step 2: the liquid inlet regulating valve (11), the liquid outlet regulating valve (12) and the vacuum pump (33) are communicated with the inner cavity of the separation tank (10); opening and adjusting a liquid inlet adjusting valve (11), a liquid outlet adjusting valve (12), a vacuum pump (33), a heat exchange medium inlet adjusting valve (21) and a heat exchange medium outlet adjusting valve (22) to enable the temperature value of the concentrated liquid in the separation tank (10), the vacuum degree in the tank, the liquid inlet speed and the liquid outlet speed to reach target limit values;
the method specifically comprises the following steps of,
step 21: maintaining the level of the liquid to be concentrated in the separation tank (10) at the tank level
Step 22: closing the liquid inlet regulating valve (11) and the liquid outlet regulating valve (12), starting the vacuum pump (33) to enable the vacuum degree in the separating tank (10) to meet the requirement of a limit value, and heating the liquid to be concentrated;
step 23: when the temperature of the liquid to be concentrated in the separating tank (10) reaches a set target temperature, sampling at regular time to measure the concentration of the concentrated liquid;
step 24: when the concentrated solution sampled and measured reaches the target concentration, the liquid inlet regulating valve (11) and the liquid outlet regulating valve (12) are opened, and at the moment, the liquid inlet amount and the liquid outlet amount in the tank cavity of the separation tank (10) accord with the water evaporation amount in unit time.
2. The solution concentration method according to claim 1, characterized in that: further comprising the step 3: and (3) monitoring the temperature value of the liquid to be concentrated in the separation tank (10) and the vacuum degree in the tank, and returning to the step (2) if the temperature value exceeds the limit value.
3. The solution concentration method according to claim 1, characterized in that: in the step 1, the mass concentration of copper ions in the solution to be concentrated is 35 multiplied by 10-3g/cm3The target concentration of the concentrated solution is 1.38-1.42 g/cm3The temperature limit value of the concentrated solution in the separating tank (10) is 70-90 ℃, the vacuum degree limit value is 60-73K/Pa, and the liquid inlet amount is 9cm3H, liquid output of 6cm3/h。
4. The solution concentration method according to claim 1, characterized in that: in step 21, the liquid level of the liquid to be concentrated in the separation tank (10) is at the level of the separation tank (10)
5. The solution concentration method according to claim 1, characterized in that: the heating unit for heating the solution to be concentrated is arranged at/in the tank body of the separating tank (10), and the heat exchange medium inlet regulating valve (21) and the heat exchange medium outlet regulating valve (22) are communicated with the heating cavity coated outside the separating tank (10) and/or a pipeline arranged in the separating tank (10).
6. The solution concentration method according to claim 1, characterized in that: the heating unit for heating the to-be-concentrated solution is arranged outside the separation tank (10), the separation tank (10) is communicated with the heating part (20) through a hot concentrated solution inlet pipe (14) and a hot concentrated solution outlet pipe (15), a circulating pump (13) is arranged on the hot concentrated solution inlet pipe (14) and/or the hot concentrated solution outlet pipe (15), and the circulating pump (13) provides power to drive the concentrated solution to be conveyed or circularly flow in the heating part (20), the hot concentrated solution inlet pipe (14), the separation tank (10) and the hot concentrated solution outlet pipe (15); the liquid inlet regulating valve (11) is positioned at the upstream of the heating part (20), and the liquid outlet regulating valve (12) is communicated with the hot concentrated liquid outlet pipe (15).
7. The solution concentration method according to claim 1, characterized in that: a demister (43) is arranged at a steam outlet on the separating tank (10), and the steam obtained by separation flows through the demister (43) and is discharged out of the tank body under the action of a vacuum pump (33); a negative pressure measuring instrument (31) and a negative pressure regulating valve (32) are arranged on a pipeline between the separating tank (10) and the vacuum pump (33); a thermometer (41) is arranged in the separating tank (10), the bottom end of the thermometer (41) is positioned below the liquid level of the liquid to be concentrated, and a liquid level meter (42) is arranged in the separating tank (10) or a window is arranged on the body of the separating tank (10).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911199030.9A CN110975308B (en) | 2019-11-29 | 2019-11-29 | Solution concentration method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911199030.9A CN110975308B (en) | 2019-11-29 | 2019-11-29 | Solution concentration method |
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| CN110975308A CN110975308A (en) | 2020-04-10 |
| CN110975308B true CN110975308B (en) | 2021-09-28 |
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| CN114177638A (en) * | 2021-12-28 | 2022-03-15 | 东莞市恒建环保科技有限公司 | Single-steaming treatment process for copper sulfate mother liquor |
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| CN103977584A (en) * | 2014-05-12 | 2014-08-13 | 江西众合装备技术有限公司 | Automatic feeding and discharging control method of copper sulfate vacuum evaporator |
| CN107298463A (en) * | 2017-07-24 | 2017-10-27 | 江西省修水赣北钨业有限公司 | A kind of control method for producing small particle order of ammoniumparatungstate crystal crystallization process |
| CN109457059A (en) * | 2018-12-12 | 2019-03-12 | 中国轻工业南宁设计工程有限公司 | Horizontal continuous sugar boiling process intelligence control system |
| CN109470546A (en) * | 2018-12-26 | 2019-03-15 | 吴小峰 | A kind of precision low-temp concentrating instrument |
| CN110496413A (en) * | 2019-07-10 | 2019-11-26 | 浙江龙基节能装备有限公司 | A kind of Increasing Production and Energy Saving technological transformation method and device of vulcanized sodium multi-effect evaporation system |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103977584A (en) * | 2014-05-12 | 2014-08-13 | 江西众合装备技术有限公司 | Automatic feeding and discharging control method of copper sulfate vacuum evaporator |
| CN107298463A (en) * | 2017-07-24 | 2017-10-27 | 江西省修水赣北钨业有限公司 | A kind of control method for producing small particle order of ammoniumparatungstate crystal crystallization process |
| CN109457059A (en) * | 2018-12-12 | 2019-03-12 | 中国轻工业南宁设计工程有限公司 | Horizontal continuous sugar boiling process intelligence control system |
| CN109470546A (en) * | 2018-12-26 | 2019-03-15 | 吴小峰 | A kind of precision low-temp concentrating instrument |
| CN110496413A (en) * | 2019-07-10 | 2019-11-26 | 浙江龙基节能装备有限公司 | A kind of Increasing Production and Energy Saving technological transformation method and device of vulcanized sodium multi-effect evaporation system |
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