CN107324359B - Alkali amine industrial salt production technology - Google Patents
Alkali amine industrial salt production technology Download PDFInfo
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- CN107324359B CN107324359B CN201710681006.3A CN201710681006A CN107324359B CN 107324359 B CN107324359 B CN 107324359B CN 201710681006 A CN201710681006 A CN 201710681006A CN 107324359 B CN107324359 B CN 107324359B
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- evaporator
- thickener
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D3/00—Halides of sodium, potassium or alkali metals in general
- C01D3/04—Chlorides
- C01D3/06—Preparation by working up brines; seawater or spent lyes
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D3/00—Halides of sodium, potassium or alkali metals in general
- C01D3/14—Purification
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
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- Engineering & Computer Science (AREA)
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- Inorganic Chemistry (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
Abstract
The invention discloses a kind of alkali amine industrial salt production technologies, include the steps that using the salt manufacturing of multiple-effect vacuum vapo(u)rization system, multiple-effect vacuum vapo(u)rization system includes at least two evaporators, a brine input pipe is provided with and communicated on every evaporator, it is characterized in that: further including the steps that removing impurity, the step of removing impurity includes that pH value detection is adjusted with pH value, wherein pH value detection includes that the fixed pH sensor for being used to measure evaporator internal liquid pH value is sealed on every evaporator；PH value adjusting include on every evaporator sealing be fixedly mounted and for being fixedly installed with control valve on water supplying pipe to the water supplying pipe to supply water in evaporator；The pH value of each evaporation pot liquid after pH value is adjusted is 7.5-8.5.Alkali amine industrial salt production technology of the invention has the advantages of easy to implement, to can be improved the light transmittance of wet salt, improve sodium chloride content in wet salt, meets the requirement of alkali amine industrial salt.
Description
Technical field
The invention belongs to salt producing craft fields, and in particular to a kind of alkali amine industrial salt production technology.
Background technique
Salt is the raw material of alkali amine industrial production ammonia (hydrochloric acid is made with salt, after with hydrochloric acid ammonia is made) and soda ash, and
Ammonia and soda ash are again respectively the big chemical raw materials of consumption, so, the demand of alkali amine industrial salt is also larger (according to can look into
The data arrived are shown: 2012, national 86,600,000 tons of overall consumption salt amount, and alkali amine industrial salt ratio is more than 80%, is reached
70750000 tons).
Salt-making process is NaCl to be precipitated after being concentrated by evaporation using brine as raw material, then become qualified after dehydrating and produce
Product.Pass through existing technical literature " summary of salt manufacturing evaporative crystallization technique " (Chinese well mine salt, page 4 to the 7th of the 4th phase of July in 2013
Page) content recorded it is found that currently, salt manufacturing mainly uses " multiple-effect vacuum evaporation production technology ", should " multiple-effect vacuum evaporation production
Technique " is: evaporator number is two or more, and brine is added in each evaporator；The heating steam of head effect evaporator is heat
The saturated vapor that power station is sent, heat are successively transmitted by each effect secondary steam, the heat source as next effect evaporator.End
Effect steam exhaust is discharged in mixing condenser by circulating cooling water condensation, and fixed gas is then pumped to atmosphere by vacuum system.Multiple-effect is steamed
In hair, with the increase of effect number, the consumption of unit steam reduces, and reduces operating cost；On the other hand, effect number is more, device
Investment cost it is also bigger.Five effects are 10% compared with the raw quantity of steam of quadruple effect saving, be further added by effect number energy-saving effect be not it is obvious that and
Installation cost increase is more, therefore domestic Salt Industry is generally five effect vacuum vaporation systems at present.
But existing " multiple-effect vacuum evaporation production technology " still has shortcoming:
Wet salt is obtained after centrifuge separates using the salt that existing " multiple-effect vacuum evaporation production technology " is discharged, but is made
The wet salt that there are light transmittances is low (be lower than 60%), the phenomenon that sodium chloride content relatively low (being lower than 90%).
Based on this, applicant considers to design a kind of light transmittance that can be improved wet salt, improves sodium chloride content in wet salt
Alkali amine industrial salt production technology.
Summary of the invention
In view of the above shortcomings of the prior art, the technical problems to be solved by the present invention are: how providing one kind can mention
The light transmittance of high wet salt improves the alkali amine industrial salt production technology of sodium chloride content in wet salt.
In order to solve the above-mentioned technical problem, present invention employs the following technical solutions:
Alkali amine industrial salt production technology is included the steps that using the salt manufacturing of multiple-effect vacuum vapo(u)rization system, the multiple-effect vacuum
Vapo(u)rization system includes at least two evaporators, is provided with and communicated with a brine input pipe on every evaporator, it is characterised in that:
Further include the steps that removing impurity, the step of removal impurity includes pH value detection and pH value adjusting, wherein institute
Stating pH value detection includes that the fixed pH sensor for being used to measure evaporator internal liquid pH value is sealed on every evaporator；
The pH value adjusting includes sealing to be fixedly mounted and for the water supply supplied water in evaporator on every evaporator
It manages, is fixedly installed with control valve on the water supplying pipe；The pH value of each evaporation pot liquid after pH value adjusting is
7.5-8.5。
The working principle of alkali amine industrial salt production technology of the invention are as follows:
By " the pH value detection " in above-mentioned " the step of removal impurity " come every evaporator internal liquid pH of real-time detection
Value is controlled to water is added inside every evaporator so that every evaporator by water supplying pipe in time by above-mentioned " pH value adjustings "
The pH value of interior liquid maintains 7.5-8.5.
So, after the pH value for evaporating pot liquid when every maintains 7.5-8.5, i.e., so that brine in evaporator
PH value reduce (brine from storage brine storage halogen tank in conveying come, store up halogen tank in brine pH value be 9-9.5), so that every
The pH value of crude salt (crystal being precipitated after the heating by brine) inside evaporator reduces, the magnesium after crude salt is dissolved in water, in crude salt
Ion exists with ionic forms, and magnesium hydroxide suspended matter and precipitating would not be generated in this way inside evaporator, to be promoted each
The light transmittance of salt discharge in a evaporator, final promoted wash salt discharge in each evaporator into desalinization of soil by flooding or leaching device, then through centrifuge point
The light transmittance of wet salt from rear acquisition (wet salt light transmittance is promoted to 80% or more from 60% or less).
Preferably, the evaporator is five, so that the multiple-effect vacuum vapo(u)rization system is five effect vacuum vaporation systems,
And five evaporators are followed successively by I effect evaporator 2001, II effect evaporator 2002, III along the flow direction from front to back of heating steam
It imitates evaporator 2003, IV effect evaporator 2004 and V and imitates evaporator 2005.
Had using the five effect vacuum vaporation systems that five evaporators are constituted and makes full use of steam heat, comprehensive method of investment return
The optimal benefit of benefit.
Preferably, alkali amine industrial salt production technology further includes the steps that the step of salt slurry is concentrated, and the salt slurry is concentrated
Include the steps that obtaining and being fixedly mounted blowdown pump, the first thickener and centrifuge；The output of the bottom of the III effect evaporator
Mouth is respectively connected to the entrance of a blowdown pump by seal for pipe joints with the delivery outlet of the bottom of IV effect evaporator, the row
The outlet of salt pump is connected to the sealing of the feed inlet of first thickener, the feed inlet of the centrifuge and first thickening
The discharge port of device bottom seals connection.
Using above-mentioned salt slurry be concentrated the step of after, ensure obtain wet salt light transmittance it is up to standard while, promoted from from
The content of sodium chloride is higher than 90.5% in the wet salt being discharged in scheming.
Moreover, it takes from III and imitates the way that salt discharge salt discharge in evaporator and IV effect evaporator enters the first thickener
Also obtainable benefit is: under the premise of ensuring product light transmittance and sodium chloride content, to heating steam heat utilization more
To be scientific and reasonable, reason is that the caloric receptivity of III effect evaporator and IV effect evaporator imitates evaporator less than I effect evaporator and II, this
Sample enables the recept the caloric salt discharge of higher I effect evaporator and II effect evaporator to directly obtain more dry crude salt, thus
It is rapidly used for that salt is made；Enable and recepts the caloric that be quickly made can for the salt discharge of lower III effect evaporator and IV effect evaporator
For the industrial wet salt of alkali amine.So, this production technology realizes salt and alkali using single five effects vacuum vaporation system
The diversity of manufacture product is realized in the preparation of amine industrial salt, and the utilization efficiency of equipment and thermal energy is substantially improved, and reduces salt manufacturing work
The investment of skill, so that production technology has higher return benefit.
Preferably, being also fixedly connected between the outlet and the feed inlet of first thickener of every blowdown pump
One cyclone, the inlet pipe of the cyclone are connected to the exit seal of the blowdown pump, and the bottom of the cyclone sinks
It seals and is connected between drop object delivery outlet and the feed inlet of first thickener, the overflow pipe of the cyclone and the III
Imitate evaporator sealing connection.
The setting of above-mentioned cyclone, the salt discharge (salt slurry) that evaporator and IV effect evaporator can be imitated to III carry out solid-liquid point
From raising enters the concentration and purity of salt slurry in the first thickener.At the same time, the setting of above-mentioned cyclone enables to pass through
The mother liquor of cyclone isolated can be conveyed to III effect evaporator, maintain to have in (control) III effect evaporator relatively stable
Solid-to-liquid ratio, conducive to the lasting balance of production technology, it is ensured that production can be persistently reliable.
Preferably, integrally cylindrical structure, the shape of lower section are integrally in the shape of the upper section of first thickener
Up big and down small cone cylindrical structure；The feed inlet of first thickener is located at the upper section of first thickener, and described first
There is overflow port at the top of the upper section of thickener；
Sealing is fixedly installed with for the elutriation punching washed by water inside the first thickener on the outer wall of first thickener
Water pipe, the jet water spout of eluriating is at the upper end that the installation site on the outer wall of the first thickener is the neighbouring cone cylindrical structure
And the position of the feed inlet lower than first thickener.
After being provided with the first thickener of above-mentioned elutriation jet water spout, the feed inlet through the first thickener enters first and increases
Salt slurry inside thick device is in decanting zone (middle section of the first thickener short transverse), and then, salt slurry is under self gravitation effect
It can be rinsed by elutriation jet water spout during falling to the lower section (compressional zone) of the first thickener and make the stone wrapped up in salt slurry
Cream and impurity overflow that (gypsum and impurity are in salt water meeting through overflow port from separating and can voluntarily float up to from liquid level in salt slurry
It is floated to liquid level), thus the content for further helping the quality for improving final products and promoting sodium chloride in wet salt product.
Preferably, the jet water spout of eluriating is that uniform intervals are arranged in the circumferential direction of the side wall of first thickener
At least two, and the circle of the water spraying direction for eluriating jet water spout and the side wall of first thickener is tangent.
Above-mentioned multiple jet water spouts of eluriating can enhance to the flushing effect into the salt slurry in the first thickener.
In addition, alkali amine industrial salt production technology further includes brine treatment step, the brine treatment step includes storage
The step of brine and into brine plus the step of alkali；Wherein, the step of storage brine is to store brine using storage halogen tank；
It is characterized by: it is described into brine plus the step of alkali in added alkali be lye, and the lye using lye storage tank come
Storage, the lye storage tank are connected to by lye delivery pipe with the storage halogen tank, and are sealed and fixed in the lye delivery pipe
Metering pump is installed.
When in brine treatment step using above-mentioned " lye storage tank ", " lye delivery pipe " and " metering pump " come to storage halogen tank
Middle addition lye also directly forms brine using storage halogen tank while can constituting brine storage equipment using storage halogen tank
With the mixing vessel (" reactor tank ") of alkali, to reduce the quantity of equipment, so that brine treatment step is more simple.
In addition, in above-mentioned brine treatment step also using above-mentioned " lye storage tank ", " lye delivery pipe " and " metering pump "
The additive amount of alkali is precisely controlled convenient for nearest or long-range control " metering pump ", so that the processing of brine is simpler efficient same
When；Also it can be precisely controlled the ratio of brine and alkali, and then optimally brine is handled, reduce calcium ion, magnesium in brine
The content of ion, sulfate ion, silica and suspended matter promotes the clarity of storage halogen tank middle and upper part clarification brine.
Preferably, the top generally openning shape of the storage halogen tank.
After structure using above-mentioned storage halogen tank, the complexity of storage halogen jar structure can reduce, reduce the cost of storage halogen tank.With
This after the structure using above-mentioned storage halogen tank, is also convenient for aloft rapidly to the inside (clarity of brine) of storage halogen tank simultaneously
It is observed, the sludge for being especially conducive to be quickly observed the bottom of storage halogen tank extracts situation.
Preferably, brine treatment step further includes blowdown step, the blowdown step includes the fixed peace on storage halogen tank
Dirt sucking tube is filled, one end of the dirt sucking tube is connected to the outer wall sealing of the interior bottom of the storage halogen tank, the fixed peace of other end sealing
Equipped with control valve.
It, can be after opening control valve, using the gravity of brine in storage halogen tank come so that storage halogen after above-mentioned dirt sucking tube is set
The sludge of pot bottom is directly excluded through dirt sucking tube, while saving electric energy, also can preferably help to maintain the clear of good storage halogen tank
Cleanliness and clarity.
Preferably, the dirt sucking tube also has the soil pick-up leading portion positioned at the interior bottom of the storage halogen tank, and before the soil pick-up
The soil pick-up mouth down of section.
Above-mentioned soil pick-up leading portion and be arranged, can accurately control the sewage discharge tube of dirt sucking tube at the interior bottom position of storage halogen tank
It sets, so that accurately the soil pick-up range of sewage discharge tube is positioned and be controlled.
Detailed description of the invention
Fig. 1 is that the structure of equipment used by the brine treatment step in alkali amine industrial salt production technology of the invention is shown
It is intended to.
Fig. 2 is the storage halogen in equipment used by the brine treatment step in alkali amine industrial salt production technology of the invention
The structural schematic diagram of the interior bottom of tank.
Fig. 3 is the structural schematic diagram of five effect vacuum vaporation systems in alkali amine industrial salt production technology of the invention.
In the figure, it is marked as
1 storage halogen tank；
2 lye storage tanks；
3 lye delivery pipes；
4 metering pumps；
5 dirt sucking tubes: 51 soil pick-up leading portions；；
6 control valves；
7 connecting branches；
8 delivery trunks.
2001-I imitates evaporator, and 2002-II imitates evaporator, and 2003-III imitates evaporator, and 2004-IV imitates evaporator, 2005-
V imitates evaporator；
201 water supplying pipes；
202 blowdown pumps；
203 first thickeners: 2031 eluriate jet water spout；
204 centrifuges；
205 cyclones.
300 mixed halogen pumps；
301-V effectiveness blowdown pump；
302-V effectiveness thickener: 3021 eluriate jet water spout；
303-V effectiveness centrifuge.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawing.Wherein, such as upper and lower, left for description use,
The exemplary terms such as right, it is therefore intended that help reader to understand, limited without being intended for.
When specific implementation: as shown in Figure 1 to Figure 3, alkali amine industrial salt production technology, including using multiple-effect vacuum evaporation system
The step of controlling salt, the multiple-effect vacuum vapo(u)rization system include at least two evaporators, are provided with and communicated on every evaporator
A piece brine input pipe,
Further include the steps that removing impurity, the step of removal impurity includes pH value detection and pH value adjusting, wherein institute
Stating pH value detection includes that the fixed pH sensor for being used to measure evaporator internal liquid pH value is sealed on every evaporator；
The pH value adjusting includes sealing to be fixedly mounted and for the water supply supplied water in evaporator on every evaporator
Pipe 201 is fixedly installed with control valve on the water supplying pipe 201；The pH of each evaporation pot liquid after pH value adjusting
Value is 7.5-8.5.
Well known to those skilled in the art when implementation, the delivery outlet of every evaporation pot bottom passes through pipeline and desalinization of soil by flooding or leaching device
Feed pipe is connected to clean through salt particle.
When implementation, brine input pipe will store up the brine transportation in halogen tank into evaporator.
The working principle of alkali amine industrial salt production technology of the invention are as follows:
By " the pH value detection " in above-mentioned " the step of removal impurity " come every evaporator internal liquid pH of real-time detection
Value, by above-mentioned " pH value adjustings " come in time by water supplying pipe 201 to inside every evaporator plus water controls so that every is steamed
The pH value of hair pot liquid maintains 7.5-8.5.
So, after the pH value for evaporating pot liquid when every maintains 7.5-8.5, i.e., so that brine in evaporator
PH value reduce (brine from storage brine storage halogen tank in conveying come, store up halogen tank in brine pH value be 9-9.5), so that every
The pH value of crude salt (crystal being precipitated after the heating by brine) inside evaporator reduces, the magnesium after crude salt is dissolved in water, in crude salt
Ion exists with ionic forms, and magnesium hydroxide suspended matter and precipitating would not be generated in this way inside evaporator, to be promoted each
The light transmittance of salt discharge in a evaporator, final promoted wash salt discharge in each evaporator into desalinization of soil by flooding or leaching device, then through centrifuge 204
The light transmittance of the wet salt obtained after separation (wet salt light transmittance is promoted to 80% or more from 60% or less).
Wherein, the evaporator is five, so that the multiple-effect vacuum vapo(u)rization system imitates vacuum vaporation systems, and five for five
Platform evaporator is followed successively by I effect evaporator, II effect evaporator, III effect evaporator, IV effect along the flow direction from front to back of heating steam
Evaporator and V imitate evaporator.
Had using the five effect vacuum vaporation systems that five evaporators are constituted and makes full use of steam heat, comprehensive method of investment return
The optimal benefit of benefit.
Wherein, alkali amine industrial salt production technology further includes the steps that the step of salt slurry is concentrated, and the salt slurry is concentrated includes
The step of obtaining and be fixedly mounted blowdown pump 202, the first thickener 203 and centrifuge 204；The bottom of the III effect evaporator
Delivery outlet and IV effect evaporator bottom delivery outlet respectively with the entrance of a blowdown pump 202 by seal for pipe joints company
Logical, the outlet of the blowdown pump 202 is connected to the sealing of the feed inlet of first thickener 203, the centrifuge 204 into
Material mouth is connected to the sealing of the discharge port of 203 bottom of the first thickener.
When implementation, blowdown pump 202, the first thickener 203 and centrifuge 204 are respectively existing equipment, and therefore not to repeat here.
Wherein for details, reference can be made to the technical solutions that: notification number is CN202391749U by blowdown pump 202(), thickener (for details, reference can be made to: it is public
Accuse number be CN201257317Y or CN204502478U a technical solution) and centrifuge 204(for details, reference can be made to: notification number is
The technical solution of CN206139350U).
Using above-mentioned salt slurry be concentrated the step of after, ensure obtain wet salt light transmittance it is up to standard while, promoted from from
The content of sodium chloride is higher than 90.5% in the wet salt being discharged in scheming 204.
Moreover, it takes from III and imitates salt discharge salt discharge doing into the first thickener 203 in evaporator and IV effect evaporator
The also obtainable benefit of method is: under the premise of ensuring product light transmittance and sodium chloride content, to the heat utilization of heating steam
It is more scientific that rationally reason is that the caloric receptivity of III effect evaporator and IV effect evaporator is less than, I imitates evaporator and II imitates evaporator,
The recept the caloric salt discharge of higher I effect evaporator and II effect evaporator is enabled to directly obtain more dry crude salt in this way, from
And it is rapidly used for that salt is made；The recept the caloric salt discharge of lower III effect evaporator and IV effect evaporator is quickly made
For the industrial wet salt of alkali amine.So, this production technology using it is single five effect vacuum vaporation system i.e. realize salt and
The diversity of manufacture product is realized in the preparation of alkali amine industrial salt, and the utilization efficiency of equipment and thermal energy is substantially improved, and reduces salt manufacturing
The investment of technique, so that production technology has higher return benefit.
Wherein, it the outlet of every blowdown pump 202 and is also fixedly connected between the feed inlet of first thickener 203
There is a cyclone 205, the inlet pipe of the cyclone 205 is connected to the exit seal of the blowdown pump 202, the cyclone
It seals and is connected between the sediment delivery outlet of 205 bottom and the feed inlet of first thickener 203, the cyclone 205
Overflow pipe and the III effect evaporator sealing be connected to.
When implementation, cyclone 205 is that existing equipment (specifically can be referring to: the technical side that notification number is CN205217162U
Case), therefore not to repeat here.
The setting of above-mentioned cyclone 205, the salt discharge (salt slurry) that evaporator and IV effect evaporator can be imitated to III carry out solid-liquid
Separation improves the concentration and purity for entering salt slurry in the first thickener 203.At the same time, the setting of above-mentioned cyclone 205 can
Enable and III effect evaporator is conveyed to by the mother liquor of cyclone 205 isolated, maintains in (control) III effect evaporator
With relatively stable solid-to-liquid ratio, conducive to the lasting balance of production technology, it is ensured that production can be persistently reliable.
Wherein, the shape of the upper section of first thickener 203 integrally integrally present by cylindrical structure, the shape of lower section
Small cone cylindrical structure under big；The feed inlet of first thickener 203 is located at the upper section of first thickener 203, described
There is overflow port at the top of the upper section of first thickener 203；
Sealing is fixedly installed with for washing by water inside the first thickener 203 on the outer wall of first thickener 203
Jet water spout 2031 is eluriated, the installation site for eluriating jet water spout 2031 on the outer wall of the first thickener 203 is neighbouring described
Bore the position of the feed inlet at the upper end of cylindrical structure and lower than first thickener 203.
After being provided with the first thickener 203 of above-mentioned elutriation jet water spout 2031, the feed inlet through the first thickener 203
Decanting zone (middle section of 203 short transverse of the first thickener), then, salt slurry are in into the salt slurry inside the first thickener 203
It can be rushed by elutriation jet water spout 2031 during falling to lower section (compressional zone) of the first thickener 203 under self gravitation effect
It washes and makes the gypsum wrapped up in salt slurry and impurity from separating and can be voluntarily floated up to from liquid level through overflow port in salt slurry
It overflows (gypsum and impurity in salt water can be floated to liquid level), to further help the quality for improving final products and be promoted wet
The content of sodium chloride in product salt.
Wherein, the elutriation jet water spout 2031 is that uniform intervals are set in the circumferential direction of the side wall of first thickener 203
At least two set, and the round phase of the water spraying direction and the side wall of first thickener 203 for eluriating jet water spout 2031
It cuts.
When implementation, preferably multiple bath directions for eluriating jet water spout 2031 are same hour hands direction of rotation.And using " institute
It states the round tangent of the side wall of the water spraying direction and first thickener 203 of eluriating jet water spout 2031 and is in same hour hands and turn
After the structure of dynamic direction ", the water sprayed through all elutriation jet water spouts 2031 is capable of forming an eddy-currents, and eddy-currents can make salt
Equal substance does not scatter density in slurry, to obtain better flushing effect.
Above-mentioned multiple jet water spouts 2031 of eluriating can enhance to the flushing effect into the salt slurry in the first thickener 203.
Brine treatment step includes the steps that the step of storing brine and adding alkali into brine；Wherein, the storage brine
The step of to store brine using storing up halogen tank 1；It is described into brine plus the step of alkali in added alkali be lye, and the alkali
Liquid is stored using lye storage tank 2, and the lye storage tank 2 is connected to by lye delivery pipe 3 with the storage halogen tank 1, and institute
It states sealing in lye delivery pipe 3 and is fixedly installed with metering pump 4.
When implementation, the diaphragm metering pump 4 of the metering pump 4 preferably band " non-return valve " function.In this way, metering pump 4 only can
Unidirectional water storage, it is ensured that the reliability of lye is added into brine.
When in brine treatment step using above-mentioned " lye storage tank 2 ", " lye delivery pipe 3 " and " metering pump 4 " come to storage
Lye is added in halogen tank 1, i.e., while can constituting brine storage equipment using storage halogen tank 1, also using storage halogen tank 1 come direct shape
At the mixing vessel (" reactor tank ") of brine and alkali, to reduce the quantity of equipment, so that brine treatment step is more simple.
In addition, using above-mentioned " lye storage tank 2 ", " lye delivery pipe 3 " and " metering pump 4 " in above-mentioned brine treatment step
Nearest or long-range control " metering pump 4 " is also convenient for be precisely controlled the additive amount of alkali, so that the processing of brine is simpler efficiently
While；Also the ratio of brine and alkali can be precisely controlled, and then optimally brine is handled, reduce brine in calcium from
The content of son, magnesium ion, sulfate ion, silica and suspended matter promotes the clarification of storage 1 middle and upper part of halogen tank clarification brine
Degree.
Wherein, the top generally openning shape of the storage halogen tank 1.
After structure using above-mentioned storage halogen tank 1, the complexity of storage 1 structure of halogen tank can reduce, reduce making for storage halogen tank 1
Valence.At the same time, after using the structure of above-mentioned storage halogen tank 1, be also convenient for aloft rapidly to storage halogen tank 1 inside (brine
Clarity) it is observed, the sludge for being especially conducive to be quickly observed the bottom of storage halogen tank 1 extracts situation.
Wherein, brine treatment step, it is characterised in that: further include blowdown step, the blowdown step is included in storage halogen tank 1
Upper fixed installation dirt sucking tube 5, one end of the dirt sucking tube 5 are connected to the outer wall sealing of the interior bottom of the storage halogen tank 1, the other end
Sealing is fixedly installed with control valve 6.
It, can be after opening control valve 6, using the gravity of brine in storage halogen tank 1 come so that storage after above-mentioned dirt sucking tube 5 is set
The sludge of 1 bottom of halogen tank is directly excluded through dirt sucking tube 5, while saving electric energy, also can preferably help to maintain good storage halogen tank 1
Cleannes and clarity.
Wherein, the dirt sucking tube 5 also has the soil pick-up leading portion 51 for the interior bottom for being located at the storage halogen tank 1, and before the soil pick-up
The soil pick-up mouth down of section 51.
Above-mentioned soil pick-up leading portion 51 and be arranged, can accurately control the sewage discharge tube of dirt sucking tube 5 in the interior bottom of storage halogen tank 1
Position, so that accurately the soil pick-up range of sewage discharge tube is positioned and be controlled.
Wherein, the dirt sucking tube 5 is horizontally spaced more, and the sewage discharge tube of more dirt sucking tubes 5 is in institute
It states and is evenly spaced in the interior bottom of storage halogen tank 1.
Above structure enables the sewage discharge tube of more dirt sucking tubes 5 to be evenly spaced in the interior bottom of storage halogen tank 1, so that
The soil pick-up range of the sewage discharge tube of more dirt sucking tubes 5 can substantially more cover the interior bottom of storage halogen tank 1, so as to be filled
Divide and efficiently filth-discharging effect.
Wherein, the more dirt sucking tubes 5 are located at the circumferential same side of the storage halogen tank 1, and every dirt sucking tube 5 is connected
The delivery outlet of the control valve 6 connect passes through a connecting branch 7 respectively and is connected to the sealing of same root delivery trunk 8.
After adopting the above structure, so that installation site of the more dirt sucking tubes 5 on storage halogen tank 1 is more concentrated, but also more
The assembling up on storage halogen tank 1 of root dirt sucking tube 5 can be more quick.
In addition, after adopting the above structure, also making the arrangement of more dirt sucking tubes 5 more regular, to facilitate using above-mentioned
" delivery trunk 8 " come collect and efficiently remotely output sludge.
Wherein, the soil pick-up leading portion 51 of adjacent two dirt sucking tubes 5 is the straight pipeline section for two straights that one is long and the other is short.
After adopting the above structure, not only have the advantages that structure is most simple, consequently facilitating implementing.It can also ensure more suctions
While the soil pick-up range of the sewage discharge tube of dirty pipe 5 is adequately coated the interior bottom of storage halogen tank 1；It is also possible that each dirt sucking tube 5
Soil pick-up leading portion 51 length it is most short and straight, to be conducive to the quick discharge of sludge, further help to improve the discharge of sludge
Efficiency.
Wherein, be additionally provided with brine suction pipe (not shown) in the storage halogen tank 1, one end of the brine suction pipe be with
The external deferent segment being connected to of the storage halogen tank 1, the other end are the suction casing inside the storage halogen tank 1.
The setting of above-mentioned brine suction pipe carrys out salt manufacturing convenient for the brine for storing up halogen tank 1 is delivered to evaporator outward.
Wherein, the suction casing generally hose, and it is fixedly connected with one piece of floating block at neighbouring port on the suction casing,
The floating block is used to enable on the suction casing at the liquid level for swimming in the brine in the storage halogen tank 1 at neighbouring port.
When implementation, the port of the suction casing is fixedly connected with a density greater than brine and is used for the end so that suction casing
The connector of mouth down.Block made from piece of stainless steel or aluminium alloy can be used in connector.
After adopting the above structure, enable to hose that can swim in the top of brine at the water surface, so, i.e.,
It can ensure that the port of suction casing can be located at for a long time in the clarification part of the brine in storage halogen tank 1, it is clear to draw more storage halogen tank 1
Clear brine is used for salt manufacturing, to better assure the quality of obtained salt.
In addition, can also implement ion film caustic soda technology of threonates using five effect vacuum vaporation systems, which burns
Alkali technology of threonates includes content of iodine rate-determining steps, and the content of iodine rate-determining steps include choosing V to imitate evaporator as ionic membrane
Caustic soda salt produces tank, and V effect evaporator directly into former halogen the step of；The content of iodine rate-determining steps further include that control V effect is steamed
The step of solid-to-liquid ratio in hair tank is 7-15%.
When implementation, V imitate evaporator directly into former halogen the step of, imitate evaporator directly into the brine stored in storage halogen tank for V
(former halogen).
When implementation, the method for measurement " V imitates the solid-to-liquid ratio in evaporator " is the prior art, for example, technical literature " is brief talked true
The method of empty salt manufacturing evaporator level gauging " (Wang Tianhe, " salt industry and chemical industry ", in the April, 2015 of page 52 to 54) and " tuning fork vibration
Application of the dynamic density meter in solid-to-liquid ratio measurement " (Wang Liang, Zhu Le, " salt industry and chemical industry ", page 40 to 44 of in September, 2012).Control
Solid-to-liquid ratio in V effect evaporator processed is also existing technological means, for example, the heating time of control V effect evaporator, or control
V imitates the water supply etc. of the water supplying pipe of evaporator.
The existing technique using five effect vacuum vaporation system salt manufacturing, because containing iodine in brine, and without going out in production technology
Iodine technique, each mother liquor imitated in evaporator production process to reuse (" mother liquor " be isolated in crystallization process precipitating or
Remaining saturated solution after crystal) and be gradually concentrated, so that the content of iodine in liquid in pipe is increased to 10-20mg/L, Wu Faman
The requirement (iodine≤1mg/kg) of sufficient ionic membrane film caustic soda salt.
After above-mentioned ion film caustic soda technology of threonates, firstly, directly feeding from former halogen, mother is recycled in elimination
The problem that liquid causes content of iodine higher.
Secondly, control " it is 7-15% that V, which imitates the solid-to-liquid ratio in evaporator, ", so that mother liquor when V imitates evaporator salt discharge in salt slurry
Content can reach 50-70%, so, i.e., enable i.e. salt discharge when salt discharge to arrange mother liquor again by solid-to-liquid ratio, to make
The mother liquor content of iodine (or gypsum content) obtained in V effect evaporator will not be gathered or be increased, thus preferably by iodine in the salt of discharge
Content mouth controls in the range of requiring.At the same time, choosing V effect evaporator is the benefit that ion film caustic soda salt produces tank, V
Effect is the most end effect for absorbing steam heat, therefore the vapor in V effect evaporator volatilizees, efficiency (heating efficiency) is most slow, to be easy to
Preferably control " it is 7-15% that V, which imitates the solid-to-liquid ratio in evaporator, ", so that the technique requires to be easier to realize.
In addition, above-mentioned ion film caustic soda technology of threonates using it is single five effect vacuum vaporation system i.e. realize salt and
The preparation of ion film caustic soda technology of threonates realizes the diversity of manufacture product, the utilization of equipment and thermal energy is substantially improved
Efficiency reduces the investment of salt producing craft, so that production technology has higher return benefit.
Wherein, the content of iodine rate-determining steps further include the steps that obtaining a mixed halogen pump 300, the mixed halogen pump 300
For extracting the mother liquor in V effect evaporator.
When implementation, the mixed halogen pump 300 is mixed-flow pump, and mixed-flow pump is that therefore not to repeat here for the prior art.
When implementation, the mother liquor for being used to extract in V effect evaporator of the mixed halogen pump 300, i.e., the inlet tube mouth of mixed halogen pump 300
It is connected to bottom in V effect evaporator.The mother liquor that halogen pump 300 is extracted by V effect evaporator is mixed by this and imitates evaporation to I effect evaporator, II
Tank, III effect evaporator charging.
In ion film caustic soda technology of threonates, extracted in V effect evaporator using above-mentioned acquisition one mixed halogen pump 300
Mother liquor the step of, can be avoided V effect evaporator in mother liquor accumulation and concentration, imitate evaporator through V to be better protected from
Content of iodine is arranged to increase.
Wherein, ion film caustic soda technology of threonates, it is characterised in that: further include V effectiveness blowdown pump 301, the thickening of V effectiveness
Machine 302 and V effectiveness centrifuge 303；
The entrance of the V effectiveness blowdown pump 301 is connected to by pipeline with the V delivery outlet sealing for imitating evaporation pot bottom,
The outlet of the V effectiveness blowdown pump 301 is connected to the sealing of the feed inlet of the V effectiveness thickener 302, the V effectiveness centrifuge
303 feed inlet is connected to the sealing of the discharge port of 302 bottom of V effectiveness thickener.
When implementation, V effectiveness blowdown pump 301 is blowdown pump, V effectiveness thickener 302 as thickener, V effectiveness centrifuge
303 be centrifuge；And blowdown pump (for details, reference can be made to the technical solutions that: notification number is CN202391749U), thickening implement body
Can be found in: notification number is the technical solution of CN201257317Y or CN204502478U) and centrifuge (for details, reference can be made to: bulletin
Number be CN206139350U technical solution) be existing equipment, therefore not to repeat here.
The use of above-mentioned V effectiveness blowdown pump 301, V effectiveness thickener 302 and V effectiveness centrifuge 303, can be effectively to V
The salt discharge of effect evaporator carries out storage and concentration, and the salt discharge of V effect evaporator and other I to IV effect can be effectively prevent to steam
The mixing for sending out tank salt discharge more reliably maintains to imitate the requirement that evaporator row's content of iodine is lower than 1mg/kg by V, it is ensured that be made
The quality of product.
Wherein, also fixed between the outlet and the feed inlet of the V effectiveness thickener of every V effectiveness blowdown pump 301
It is connected with a V effectiveness cyclone, the exit seal company of the inlet pipe of the V effectiveness cyclone and the V effectiveness blowdown pump 301
It is logical, it seals and is connected between the sediment delivery outlet of the bottom of the V effectiveness cyclone and the feed inlet of the V effectiveness thickener,
The overflow pipe of the V effectiveness cyclone is connected to V effect evaporator sealing.
When implementation, V effectiveness cyclone is that existing equipment (specifically can be referring to: the technical side that notification number is CN205217162U
Case), therefore not to repeat here.
The setting of above-mentioned V effectiveness cyclone, can to V imitate evaporator salt discharge (salt slurry) be separated by solid-liquid separation, improve into
Enter the concentration and purity of salt slurry in V effectiveness thickener.At the same time, the setting of above-mentioned V effectiveness cyclone enables to imitate by V
It can be conveyed to V effect evaporator with the mother liquor of cyclone isolated, preferably had more in maintenance (control) V effect evaporator
Stable solid-to-liquid ratio, conducive to the lasting balance of production technology, it is ensured that production can be persistently reliable.
Wherein, the shape of the upper section of the V effectiveness thickener integrally integrally present greatly by cylindrical structure, the shape of lower section
Under small cone cylindrical structure；The feed inlet of the V effectiveness thickener is located at the upper section of the V effectiveness thickener, and the V effectiveness increases
There is overflow port at the top of the upper section of thick device；
Sealing is fixedly installed with for the elutriation washed by water inside V effectiveness thickener on the outer wall of the V effectiveness thickener
Jet water spout 3021, the installation site for eluriating jet water spout 3021 on the outer wall of V effectiveness thickener are the neighbouring cone cylinder type
The position of feed inlet at the upper end of structure and lower than the V effectiveness thickener.
After being provided with the V effectiveness thickener of above-mentioned elutriation jet water spout 3021, the feed inlet through V effectiveness thickener enters
Salt slurry inside V effectiveness thickener is in decanting zone (middle section of V effectiveness thickener short transverse), and then, salt slurry is in itself weight
It can be rinsed by elutriation jet water spout 3021 during falling to the lower section (compressional zone) of V effectiveness thickener under power effect and make salt
The iodine wrapped up in slurry from separated in salt slurry and can voluntarily float up to from liquid level through overflow port overflow (iodine can be floated to liquid
Face), so that further help improves the quality of final products.
Wherein, the elutriation jet water spout 3021 is that uniform intervals are arranged in the circumferential direction of the side wall of the V effectiveness thickener
At least two, and the water spraying direction for eluriating jet water spout 3021 and the side wall of the V effectiveness thickener is round tangent.
When implementation, preferably multiple bath directions for eluriating jet water spout 3021 are same hour hands direction of rotation.And using " institute
It states the round tangent of the side wall of the water spraying direction and the V effectiveness thickener of eluriating jet water spout 3021 and is in same hour hands and rotate
Direction " after structure, the water sprayed through all elutriation jet water spouts 3021 are capable of forming an eddy-currents, and eddy-currents can make salt slurry
Equal substance does not scatter middle density, to obtain better flushing effect.
Above-mentioned multiple jet water spouts 3021 of eluriating can enhance to the flushing effect into the salt slurry in V effectiveness thickener, more
The content of iodine in salt discharge is reduced well.
The above is only the preferred embodiment of the present invention, need to point out it is that this skill is not being departed from for those skilled in the art
Under the premise of art scheme, several modifications and improvements can also be made, the technical solution of above-mentioned modification and improvement, which should equally be considered as, to be fallen
Enter the claimed range of the claims.
Claims (10)
1. alkali amine industrial salt production technology includes the steps that, using the salt manufacturing of multiple-effect vacuum vapo(u)rization system, the multiple-effect vacuum steams
Hair system includes at least two evaporators, is provided with and communicated with a brine input pipe on every evaporator, it is characterised in that:
Further include the steps that removing impurity, the step of removal impurity includes pH value detection and pH value adjusting, wherein the pH
Value detection includes that the fixed pH sensor for being used to measure evaporator internal liquid pH value is sealed on every evaporator；
The pH value adjusting includes sealing to be fixedly mounted and for the water supplying pipe to supply water in evaporator, institute on every evaporator
It states and is fixedly installed with control valve on water supplying pipe；The pH value of each evaporation pot liquid after pH value adjusting is 7.5-8.5；
So that magnesium ion exists in crude salt inside every evaporator with ionic forms, hydrogen-oxygen would not be generated in this way inside evaporator
Change magnesium suspended matter and precipitating, helps the light transmittance for promoting salt discharge in each evaporator.
2. alkali amine industrial salt production technology according to claim 1, it is characterised in that: the evaporator is five, is made
Obtaining the multiple-effect vacuum vapo(u)rization system is five effect vacuum vaporation systems, and five evaporators are along the stream from front to back of heating steam
Evaporator is imitated to I effect evaporator, II effect evaporator, III effect evaporator, IV effect evaporator and V is followed successively by.
3. alkali amine industrial salt production technology according to claim 2, it is characterised in that: further include the step of salt slurry concentration
Suddenly, the step of salt slurry is concentrated includes the steps that obtaining and blowdown pump, the first thickener and centrifuge is fixedly mounted；It is described
III imitates the respective entrance with a blowdown pump of delivery outlet of the delivery outlet of the bottom of evaporator and the bottom of IV effect evaporator
It is connected to by seal for pipe joints, the outlet of the blowdown pump is connected to the sealing of the feed inlet of first thickener, the centrifugation
The feed inlet of machine is connected to the sealing of the discharge port of first thickener bottom.
4. alkali amine industrial salt production technology according to claim 3, it is characterised in that: the outlet of every blowdown pump
A cyclone, the inlet pipe of the cyclone and the row are also fixedly connected between the feed inlet of first thickener
The exit seal of salt pump is connected to, between the sediment delivery outlet of the bottom of the cyclone and the feed inlet of first thickener
Sealing connection, the overflow pipe of the cyclone are connected to III effect evaporator sealing.
5. alkali amine industrial salt production technology according to claim 3, it is characterised in that: the upper section of first thickener
Shape integrally cylindrical structure, the shape of lower section are integrally in up big and down small cone cylindrical structure；First thickener
Feed inlet is located at the upper section of first thickener, has overflow port at the top of the upper section of first thickener；
Sealing is fixedly installed with for the elutriation jet water spout washed by water inside the first thickener on the outer wall of first thickener,
The elutriation jet water spout is at the upper end that the installation site on the outer wall of the first thickener is the neighbouring cone cylindrical structure and low
In the position of the feed inlet of first thickener.
6. alkali amine industrial salt production technology according to claim 5, it is characterised in that: the elutriation jet water spout is in institute
State uniform intervals in the circumferential direction of the side wall of the first thickener are arranged at least two, and the water spraying direction for eluriating jet water spout with
The circle of the side wall of first thickener is tangent.
7. alkali amine industrial salt production technology according to claim 1, it is characterised in that: it further include brine treatment step,
The brine treatment step includes the steps that the step of storing brine and adding alkali into brine；Wherein, the step of the storage brine
Rapid is to store brine using storage halogen tank；Added alkali is lye in described the step of adding alkali into brine, and the lye is adopted
It is stored with lye storage tank, the lye storage tank is connected to by lye delivery pipe with the storage halogen tank, and the lye is defeated
Sealing on pipe is sent to be fixedly installed with metering pump.
8. alkali amine industrial salt production technology according to claim 7, it is characterised in that: the top of the storage halogen tank is whole
For openning shape.
9. alkali amine industrial salt production technology according to claim 7, it is characterised in that: it further include blowdown step, it is described
Blowdown step includes that dirt sucking tube is fixedly mounted on storage halogen tank, outside the interior bottom of one end of the dirt sucking tube and the storage halogen tank
Wall sealing connection, other end sealing are fixedly installed with control valve.
10. alkali amine industrial salt production technology according to claim 9, it is characterised in that: the dirt sucking tube also has position
Soil pick-up leading portion in the interior bottom of the storage halogen tank, and the soil pick-up mouth down of the soil pick-up leading portion.
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| CN201710681006.3A CN107324359B (en) | 2017-08-10 | 2017-08-10 | Alkali amine industrial salt production technology |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1053045A (en) * | 1989-12-30 | 1991-07-17 | 中南工业大学 | The method of removing magnesium from sodium chloride solution |
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2017
- 2017-08-10 CN CN201710681006.3A patent/CN107324359B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1053045A (en) * | 1989-12-30 | 1991-07-17 | 中南工业大学 | The method of removing magnesium from sodium chloride solution |
Non-Patent Citations (1)
| Title |
|---|
| 制盐蒸发结晶技术简述;米云龙，蒋道利;《中国井矿盐》;20130731;第44卷;第5页 |
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