CN217498701U - Ferrous sulfate monohydrate apparatus for producing - Google Patents
Ferrous sulfate monohydrate apparatus for producing Download PDFInfo
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- CN217498701U CN217498701U CN202121499291.5U CN202121499291U CN217498701U CN 217498701 U CN217498701 U CN 217498701U CN 202121499291 U CN202121499291 U CN 202121499291U CN 217498701 U CN217498701 U CN 217498701U
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Abstract
The invention relates to a ferrous sulfate monohydrate production device in the field of waste recovery treatment, which comprises a crystal conversion tank, wherein the crystal conversion tank is provided with a stirrer, and a condenser, a steam compressor and a solid-liquid separator are matched with the crystal conversion tank; the inlet and outlet of the cooling medium of the condenser are respectively communicated with the middle part and the bottom part of the crystal conversion groove; the inlet of the vapor compressor is communicated with the upper part of the crystal transfer groove, and the outlet of the vapor compressor is connected with the condenser; an inlet of the solid-liquid separator is communicated with the bottom of the crystal rotating tank, a ferrous sulfate mother liquor outlet of the solid-liquid separator is communicated with the middle part of the crystal rotating tank, and the other outlet of the solid-liquid separator is used for discharging ferrous sulfate monohydrate crystals; the matched steam compressor and condenser pump the water vapor in the crystal conversion tank to form a vacuum state, and compress the water vapor into high-temperature high-pressure water vapor, and the heat of the high-temperature high-pressure water vapor is utilized to circularly heat the ferrous sulfate solution in the crystal conversion tank, thereby reducing the energy consumption; and the solid-liquid separator discharges the ferrous sulfate monohydrate crystals out of the crystal transfer tank, and the ferrous sulfate mother liquor flows back to the crystal transfer tank, so that energy is saved and emission is reduced.
Description
Technical Field
The invention relates to the field of waste recovery and treatment technology and equipment manufacturing, in particular to a ferrous sulfate monohydrate production device.
Background
Ferrous sulfate heptahydrate is a byproduct of producing metal oxides such as titanium dioxide by a sulfuric acid method, can only be used for water treatment, and is used as a flocculating agent, a precipitator and the like, and the value is not high; if the iron sulfate is converted into ferrous sulfate monohydrate, the value is multiplied, and the iron sulfate can be used as a supplement of iron in feed, and can be used for preparing iron salt, iron oxide pigment, mordant, water purifying agent, preservative, disinfectant and the like.
The traditional wet production process of ferrous sulfate monohydrate comprises the following steps: putting ferrous sulfate heptahydrate solid into a beating tank, heating, beating and dissolving the ferrous sulfate heptahydrate solid in the beating tank by using steam, adding a small amount of 25 percent dilute sulfuric acid to adjust the acidity of the beating slurry in the dissolving process, and then adding a small amount of iron powder; and then, conveying the dissolved ferrous sulfate solution to a wet-process crystal transfer tank by using a water pump for heating, evaporating water, gradually dehydrating the ferrous sulfate solution in the wet-process crystal transfer tank to convert the ferrous sulfate solution into grey ferrous sulfate monohydrate crystals, and performing solid-liquid separation on the converted liquid by using a basket centrifuge when the ferrous sulfate solution in the crystal transfer tank is completely converted into grey. And returning part of the ferrous sulfate mother liquor subjected to solid-liquid separation to the pulping tank for reuse, sending the rest of the ferrous sulfate mother liquor to a cooling tank for cooling, recovering ferrous sulfate monohydrate crystals by a basket centrifuge, and sending the rest of the ferrous sulfate cooling liquor to a sewage treatment station for neutralization treatment.
The problems of the traditional wet method for producing the ferrous sulfate monohydrate are as follows:
1. only part of the heptahydrate ferrous sulfate is converted into monohydrate ferrous sulfate, and the rest is poured out to be wasted, so that resources are wasted, and the sewage treatment cost is increased;
2. in each batch of production, part of high-temperature ferrous sulfate mother liquor after solid-liquid separation needs to be cooled to recover ferrous sulfate monohydrate crystals, a large amount of heat sources are wasted, and the proportion of the heat sources is large, so that the production cost of the ferrous sulfate monohydrate is basically high.
The above traditional technologies have large equipment investment, low operation efficiency and high production cost, and improvement is urgently needed.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a ferrous sulfate monohydrate production device.
The technical scheme adopted by the invention is as follows:
the production method of the ferrous sulfate monohydrate comprises the following steps:
1) dissolving, namely dissolving the ferrous sulfate heptahydrate solid by using water vapor to form a ferrous sulfate solution;
2) vacuum evaporation, namely performing vacuum evaporation on the ferrous sulfate solution, and gradually concentrating the ferrous sulfate solution;
3) the heat of the water vapor evaporated in the heating-vacuum state is used for heating the ferrous sulfate solution through heat exchange;
4) the temperature of the separated crystal-ferrous sulfate solution is raised, more water vapor is evaporated in vacuum, and the ferrous sulfate solution is further concentrated to separate out ferrous sulfate monohydrate crystals;
5) solid-liquid separation, namely separating ferrous sulfate monohydrate crystals, and refluxing the residual ferrous sulfate mother liquor into the ferrous sulfate solution in the step 1);
6) and (3) adding the ferrous sulfate heptahydrate solid and the water vapor into the ferrous sulfate mother liquor to dissolve the ferrous sulfate heptahydrate solid and the water vapor into a ferrous sulfate solution, and entering the step 1) to start the next cycle.
The ferrous sulfate monohydrate production device comprises a crystal conversion tank, wherein a stirrer is arranged in the crystal conversion tank, ferrous sulfate heptahydrate solids and a water vapor inlet are arranged at the upper part of the crystal conversion tank, and a condenser, a vapor compressor and a solid-liquid separator are matched with the crystal conversion tank.
Furthermore, a cooling medium inlet and a cooling medium outlet of the condenser are respectively communicated with the middle part and the bottom part of the crystal rotating groove;
the inlet of the steam compressor is communicated with the upper part of the crystal rotating groove, the outlet of the steam compressor and steam to be supplemented are connected with the inlet of the condenser, the outlet of the condenser is connected with a pressure regulating valve, and the pressure regulating valve discharges condensed water outwards;
the inlet of the solid-liquid separator is communicated with the bottom of the crystal rotating groove, the ferrous sulfate mother liquor outlet of the solid-liquid separator is communicated with the middle part of the crystal rotating groove, and the other outlet of the solid-liquid separator is used for discharging ferrous sulfate monohydrate crystals.
Further, a cooling medium outlet of the condenser is communicated with the middle part of the crystal transfer tank, a cooling medium inlet of the condenser is communicated with a ferrous sulfate mother liquor outlet of the solid-liquid separator;
the inlet of the solid-liquid separator is communicated with the bottom of the crystal tank, the ferrous sulfate mother liquor outlet of the solid-liquid separator is connected with the cooling medium inlet of the condenser, and the other outlet of the solid-liquid separator discharges ferrous sulfate monohydrate crystals.
The vapor compressor inlet communicates the upper part of the crystal conversion groove, the vapor compressor outlet and the steam to be supplemented are connected with the condenser inlet, the condenser outlet is connected with the pressure regulating valve, and the pressure regulating valve discharges condensed water outwards.
The invention has the beneficial effects that:
1) the crystal conversion groove is matched with a steam compressor to suck the water vapor in the crystal conversion groove, and the interior of the crystal conversion groove is in a vacuum state to accelerate the evaporation of the water vapor; the water vapor is compressed into high-temperature and high-pressure water vapor, so that the heat is conveniently recovered;
2) the matched condenser is used for recovering the heat of the high-temperature and high-pressure water vapor of the vapor compressor and is used for circularly heating the ferrous sulfate solution in the crystal conversion tank to raise the temperature of the ferrous sulfate solution and reduce the energy consumption;
3) the solid-liquid separator is matched, ferrous sulfate monohydrate crystals are discharged out of the crystal transfer tank in time, the ferrous sulfate mother liquor flows back to the crystal transfer tank, the feeding production is continued, the waste of raw materials is avoided, the waste discharge is eliminated, and the raw material cost is saved;
4) the crystal conversion tank is matched with a steam compressor, a condenser and a solid-liquid separator, so that the energy is saved, the emission is reduced, the production cost of ferrous sulfate monohydrate crystals is greatly reduced, and the popularization value is realized.
Drawings
FIG. 1 is a schematic diagram of a ferrous sulfate monohydrate production apparatus.
FIG. 2 is a second schematic diagram of a ferrous sulfate monohydrate production apparatus.
FIG. 3 is a third schematic view of a ferrous sulfate monohydrate production apparatus.
In the figure, 1-a crystal transfer tank, 2-a condenser, 3-a solid-liquid separator, 4-a steam compressor, 5-heptahydrate ferrous sulfate solid, 6-monohydrate ferrous sulfate crystal, 7-steam to be supplemented, 8-condensed water, 9-a stirrer, 10-a pressure regulating valve, 11-a filter and 12-a dissolving tank are shown, and arrows in the figure indicate the flowing directions of water, steam, solution, raw materials and finished products.
Detailed Description
FIG. 1 is a schematic diagram of a ferrous sulfate monohydrate production device, which comprises a crystal conversion tank, wherein a stirrer is arranged in the crystal conversion tank, ferrous sulfate heptahydrate solid and a water vapor inlet are arranged at the upper part of the crystal conversion tank, and a condenser, a steam compressor and a solid-liquid separator are matched with the crystal conversion tank.
A cooling medium inlet and outlet of the condenser are respectively communicated with the middle part and the bottom part of the crystal conversion groove; the inlet of the steam compressor is communicated with the upper part of the crystal rotating groove, the outlet of the steam compressor and steam to be supplemented are connected with the inlet of the condenser, the outlet of the condenser is connected with a pressure regulating valve, and the pressure regulating valve discharges condensed water outwards; the inlet of the solid-liquid separator is communicated with the bottom of the crystal rotating groove, the ferrous sulfate mother liquor outlet of the solid-liquid separator is communicated with the middle part of the crystal rotating groove, and the other outlet of the solid-liquid separator is used for discharging ferrous sulfate monohydrate crystals.
The cooling medium outlet of the condenser is communicated with the middle part of the crystal conversion tank, and the cooling medium inlet of the condenser is communicated with the ferrous sulfate mother liquor outlet of the solid-liquid separator; the inlet of the solid-liquid separator is communicated with the bottom of the crystal tank, the ferrous sulfate mother liquor outlet of the solid-liquid separator is connected with the cooling medium inlet of the condenser, and the other outlet of the solid-liquid separator discharges ferrous sulfate monohydrate crystals.
The inlet of the steam compressor is communicated with the upper part of the crystal rotating groove, the outlet of the steam compressor and steam to be supplemented are connected with the inlet of the condenser, the outlet of the condenser is connected with a pressure regulating valve, and the pressure regulating valve discharges condensed water outwards, which is shown as the second schematic diagram of the ferrous sulfate monohydrate production device in figure 2.
Fig. 3 is a third schematic diagram of a ferrous sulfate monohydrate production device, which is a schematic diagram of a large-scale production device, and is additionally provided with a dissolving tank specially used for dissolving ferrous sulfate heptahydrate solids, an original crystal transfer tank is specially used for crystallizing ferrous sulfate monohydrate, and the two are in work division and cooperation, so that the dissolving and crystallizing alternate production shown in fig. 1 and fig. 2 is changed, the production line is formed, the dissolving and crystallizing are carried out simultaneously, the yield is high, the quality is good, and the efficiency is high.
The crystal transformation tank is a sealed tank body, a stirrer is arranged in the crystal transformation tank, the dissolution of the ferrous sulfate heptahydrate solid can be accelerated, the ferrous sulfate heptahydrate solid is dissolved in water, the solubility is 48.6g/100ml water at 50 ℃, namely, water or water vapor only needs to be heated to more than 50 ℃; when the temperature rises to above 65 ℃, the ferrous sulfate solution begins to crystallize to separate ferrous sulfate monohydrate crystals.
The temperature of the crystal transition tank can be set between 75 ℃ and 115 ℃, and is preferably about 100 ℃.
The solid-liquid separator is used for crystallizing the ferrous sulfate monohydrate, separating the ferrous sulfate monohydrate from a ferrous sulfate solution and discharging the ferrous sulfate monohydrate; the solid-liquid separator works intermittently, and is started when the ferrous sulfate monohydrate is sufficiently crystallized, so that the solid-liquid separator can be set to start and stop at fixed time without continuously starting.
The steam compressor has the functions of firstly sucking the water vapor in the crystal conversion tank to enable the interior of the crystal conversion tank to form a vacuum state to accelerate the evaporation of the water vapor and secondly compressing the water vapor to enable the water vapor to become high-temperature and high-pressure water vapor, so that a foundation is laid for heat exchange of the water vapor entering the condenser.
The condenser is used for converting the heat of high-temperature and high-pressure steam output by the steam compressor into ferrous sulfate solution entering from the cooling medium inlet, namely heating the ferrous sulfate solution, and accelerating the evaporation of the steam in the crystal conversion tank. The high-temperature and high-pressure steam is discharged as condensed water and discharged out of the condenser, and the opening degree of the pressure regulating valve is regulated according to the quantity of the condensed water. The pressure regulating valve can regulate the outlet pressure of the steam compressor and control the steam pressure of the high-temperature and high-pressure steam.
The working process of the invention is as follows:
1) dissolving: introducing steam or hot water into a crystal transfer tank, stirring and uniformly adding ferrous sulfate heptahydrate solid at the temperature of more than 50 ℃ to obtain a ferrous sulfate solution;
2) vacuum evaporation: a steam compressor is started, the steam compressor sucks the water vapor in the crystal conversion groove, a vacuum state is formed in the crystal conversion groove, and the evaporation of the water vapor is accelerated;
3) heating: opening a condenser, inputting high-temperature and high-pressure steam from a steam compressor, allowing a ferrous sulfate solution to enter from a cooling medium inlet, and allowing heat of the high-temperature and high-pressure steam to be exchanged heat through the condenser to heat the ferrous sulfate solution, wherein the heated ferrous sulfate solution returns to a rotary crystal tank from a cooling medium outlet; the heat released by the high-temperature and high-pressure water vapor is changed into condensed water to be discharged out of the condenser;
4) and (3) crystal precipitation: the temperature of the ferrous sulfate solution in the crystal conversion tank is raised to 65 ℃, more steam is evaporated, the ferrous sulfate solution is further concentrated, and ferrous sulfate monohydrate crystals are separated out;
5) solid-liquid separation: starting a solid-liquid separator at regular time, separating ferrous sulfate monohydrate crystals, and refluxing the residual ferrous sulfate mother liquor into a crystal transfer tank;
6) and (3) adding materials again: adding ferrous sulfate heptahydrate solid and a proper amount of water vapor into a crystal transfer tank to dissolve the ferrous sulfate heptahydrate solid into ferrous sulfate solution, and starting the next cycle.
When the capacity is large, ferrous sulfate heptahydrate solid can be continuously supplemented, solid-liquid separation of ferrous sulfate monohydrate crystals can be continuously carried out, and the production efficiency is improved.
Claims (3)
1. Ferrous sulfate monohydrate apparatus for producing, including changeing brilliant groove, characterized by:
the device is characterized in that a stirrer is arranged in the crystal conversion tank, a ferrous sulfate heptahydrate solid and a water vapor inlet are arranged at the upper part of the crystal conversion tank, and the crystal conversion tank is matched with a condenser, a vapor compressor and a solid-liquid separator.
2. The apparatus for producing ferrous sulfate monohydrate as claimed in claim 1, wherein:
a cooling medium inlet and a cooling medium outlet of the condenser are respectively communicated with the middle part and the bottom part of the crystal conversion groove;
the inlet of the steam compressor is communicated with the upper part of the crystal conversion groove, the outlet of the steam compressor and steam to be supplemented are connected with the inlet of the condenser, the outlet of the condenser is connected with a pressure regulating valve, and the pressure regulating valve discharges condensed water outwards;
and an inlet of the solid-liquid separator is communicated with the bottom of the crystal rotating groove, a ferrous sulfate mother liquor outlet of the solid-liquid separator is communicated with the middle part of the crystal rotating groove, and the other outlet of the solid-liquid separator discharges ferrous sulfate monohydrate crystals.
3. The apparatus for producing ferrous sulfate monohydrate as claimed in claim 1, wherein:
the cooling medium outlet of the condenser is communicated with the middle part of the crystal transfer tank, and the cooling medium inlet of the condenser is communicated with the ferrous sulfate mother liquor outlet of the solid-liquid separator;
an inlet of the solid-liquid separator is communicated with the bottom of the crystal tank, a ferrous sulfate mother liquor outlet of the solid-liquid separator is connected with a cooling medium inlet of the condenser, the other outlet of the solid-liquid separator discharges ferrous sulfate monohydrate crystals,
the inlet of the steam compressor is communicated with the upper part of the crystal conversion groove, the outlet of the steam compressor and steam to be supplemented are connected with the inlet of the condenser, the outlet of the condenser is connected with a pressure regulating valve, and the pressure regulating valve discharges condensed water outwards.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121499291.5U CN217498701U (en) | 2021-07-03 | 2021-07-03 | Ferrous sulfate monohydrate apparatus for producing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121499291.5U CN217498701U (en) | 2021-07-03 | 2021-07-03 | Ferrous sulfate monohydrate apparatus for producing |
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| Publication Number | Publication Date |
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| CN217498701U true CN217498701U (en) | 2022-09-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202121499291.5U Active CN217498701U (en) | 2021-07-03 | 2021-07-03 | Ferrous sulfate monohydrate apparatus for producing |
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2021
- 2021-07-03 CN CN202121499291.5U patent/CN217498701U/en active Active
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