CN206308025U - Mirabilite hydrate is dehydrated the device and involved molten nitre equipment of glauber salt processed in a kind of chlor-alkali production - Google Patents
Mirabilite hydrate is dehydrated the device and involved molten nitre equipment of glauber salt processed in a kind of chlor-alkali production Download PDFInfo
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Abstract
The utility model provides the device and involved molten nitre equipment of mirabilite hydrate dehydration glauber salt processed in a kind of chlor-alkali production, and the device passes through to introduce molten nitre liquid, coordinates and melt the purpose that nitre unit, intensification unit, salting-out crystallizer, solid-liquid separator etc. realize mirabilite hydrate dehydration production glauber salt.The molten nitre equipment for being used includes：Molten nitre groove inner chamber is divided into solid phase area and melting zone by molten nitre groove and molten nitre device, grid, and molten nitre device is connected with the bottom of melting zone, is melted nitre liquid and is entered melting mirabilite hydrate in melting zone all the way；Another road enters in molten nitre device starches consolute with the nitre from melting zone sedimentation.The utility model is chlor-alkali enterprises caustic soda, purified salt, glauber salt coproduction, the cheap SO high in underground together with whole chlor-alkali system globe area creatively this technique4 2‑Bittern large-scale use has started a brand-new production technology.Compared with the mirabilite hydrate dewatering process of existing operation, with serialization efficient stable operation, environmental protection and energy saving, production high-quality the characteristics of.
Description
Technical field
The utility model belongs to inorganic salts separation technology field, and in particular in a kind of ion film caustic soda production, embrane method
The mirabilite hydrate that denitration is isolated is separated through melting, heating, salting-out crystallization, reclaims salt made from earth containing a comparatively high percentage of sodium chloride saturated solution freezing denitration, dechlorination altogether
The mirabilite hydrate dehydration processing technology of the processes such as alkali production system production caustic soda.
Background technology
Contain Na in the raw material that ion-exchange membrane electrolysis saline solution production caustic soda is used2SO4As attendants all the time
It is present in crude salt.Certain Na is also added in light salt brine dechlorination process2SO3As the trip in reducing agent reduction light salt brine
From chlorine, a small amount of Na is generated again2SO4.During ion-exchange membrane electrolysis saline solution production caustic soda, the Na during brine recycling2SO4
Gradually accumulation the solubility of sodium chloride can be influenceed, and then the current efficiency of electrolysis can be reduced, prevent production from efficiently normally running,
Be must be driven off as objectionable impurities.With promoting the use of for light salt brine Nitrate removal technology by membrane, gradually washed in a pan in chlor-alkali production enterprise
Eliminate barium method（Ba2++SO4 2--=BaSO4↓）Except SO4 2-Technology is substituted by advanced Nitrate removal technology by membrane.Nitrate removal technology by membrane is light
Salt solution is separated into dense salt made from earth containing a comparatively high percentage of sodium chloride water and poor salt made from earth containing a comparatively high percentage of sodium chloride water, and poor salt made from earth containing a comparatively high percentage of sodium chloride Water Sproading to brine system is re-used, then with freezing from dense
Mirabilite hydrate is crystallized out in salt made from earth containing a comparatively high percentage of sodium chloride water.
At this stage in chlor-alkali devices light salt brine embrane method except nitre produce mirabilite hydrate process anhydrous sodium sulfate method have
Following several method：
1. the molten salt made from earth containing a comparatively high percentage of sodium chloride condensation for removing water method of autoclave, intermittent operation, disposably salting-out agents NaCl is added after mirabilite hydrate melting, is collected
Middle supersaturation separates out thenardite, salting-out agents NaCl input amounts, saltout after solution composition, reaction time control, reaction end
The factors such as determination do not know, and product crystalline solid particle is unstable, of poor quality.
2. evaporation concentration method, after mirabilite hydrate melting is isolated into thenardite, is concentrated by evaporation saturated solution production anhydrous
Saltcake, hypersaturated state is in solution during saltcake saturated solution separates out thenardite whole process is concentrated by evaporation, and operates root
Originally cannot carry out, be detected in report without industrialization example；
3. hot melt, thenardite is isolated after mirabilite hydrate melting, by saturated solution freezing separation mirabilite hydrate, ten again
The remelted separating anhydrous saltcake of water saltcake, one cycle saltcake eduction rate highest 33.79%, the recycle stock in whole device is all
In saturation state, operation difficulty is big, and each link blocks serious driving and parking frequently, the primary condition for not possessing continuous operation.
More than from the point of view of each processing technology, various mirabilite hydrate dewatering process are immature, do not possess industrialization continuous raw
The condition of product, mirabilite hydrate is quite big relative to the limitation that thenardite is used, and causes chlor-alkali enterprises embrane method denitration by-product ten
Water saltcake is seriously unsalable, substantially hopeless, largely also constrains cheap awns bittern high as caustic soda raw material
Use value.
The content of the invention
Technical assignment of the present utility model is to solve the deficiencies in the prior art, there is provided mirabilite hydrate takes off in a kind of chlor-alkali production
The device of water glauber salt and involved molten nitre equipment, scientifically and rationally solve the dehydration of chlor-alkali enterprises by-product mirabilite hydrate
Problem, for enterprise provides a kind of economic and practical mirabilite hydrate evaporation.
Term explanation：
Dense salt made from earth containing a comparatively high percentage of sodium chloride water described in the utility model is referred to：The concentrate that embrane method denitration is isolated.
Poor salt made from earth containing a comparatively high percentage of sodium chloride water described in the utility model is referred to：After the permeate that embrane method denitration is isolated, or freezing denitration
Solution.
It is described in the utility model to be referred to containing nitre solution admittedly high：Formed after molten nitre between mirabilite hydrate and molten nitre liquid
The solution for being precipitated with part glauber salt.
Nitre solution high described in the utility model is referred to：Containing the solution formed after the heated intensification of nitre solution admittedly high.
Saturated solution is referred to salt made from earth containing a comparatively high percentage of sodium chloride described in the utility model altogether：Nitre solution high is after salting-out crystallization, separation of solid and liquid
Supernatant.
The theory of Research Thinking of the present utility model and foundation is as follows：
First, we introduce heat-carrying, loading fluid of 40 DEG C -70 DEG C molten nitre liquid as the whole dehydration of mirabilite hydrate,
The uppity solid-liquid change occurred when mirabilite hydrate is melted（Melting, crystallization, precipitation glauber salt, saturated aqueous solution and water
Conversion between compound and containing the conversion between different hydrates）It is converted into the easily-controllable state of salt made from earth containing a comparatively high percentage of sodium chloride aqueous mixtures.It is mixed with salt made from earth containing a comparatively high percentage of sodium chloride water
Dissolving in and separating out for transfer that compound circulates to realize heat and material, completes the base that mirabilite hydrate is dehydrated glauber salt processed
This technological process.Secondly, we observe the whole process that mirabilite hydrate is melted with 40 DEG C -70 DEG C molten nitre liquid, ten certain water awns
Nitre is gradually added into molten nitre liquid, and the change procedure of mirabilite hydrate is softening, pulpous state fluid, stiff stratified fluid, temperature reduction, fluid
Phase stabilization, increases molten nitre liquid liquid measure, and mixing liquid solid-liquid is layered rapidly, as stabilization containing the common saturated solution of solid salt made from earth containing a comparatively high percentage of sodium chloride.The
The introducing of three, solid NaCl reduces the melt temperature of mirabilite hydrate, and caloric receptivity is big when mirabilite hydrate is melted, mirabilite hydrate melting
Amount is corresponding with caloric receptivity, melts molten nitre liquid temperature difference before and after nitre and Na in solution is determined after molten nitre2SO4Content.
The utility model solves the technical scheme that its technical problem used：
1st, mirabilite hydrate is dehydrated the molten nitre equipment involved by glauber salt processed in a kind of chlor-alkali production of the utility model offer, its
It is characterised by, including：Be divided into for its inner chamber by molten nitre groove, consolute device and molten nitre liquid pipe road, the grid in the molten nitre groove
Solid phase area and melting zone, and solid phase area is located at the top of melting zone, mirabilite hydrate is piled up in solid phase area, and consolute device is starched through nitre and flowed
Pipeline is connected with the bottom of melting zone, melts nitre liquid pipe road point two-way：
Wherein enter in melting zone all the way, contacted with the mirabilite hydrate being deposited in solid phase area from bottom to top, connect in solid-liquid
Melted at contacting surface, melt formed nitre slurry and enter melting zone from grid gap；Another road enters in consolute device, molten with oneself
The nitre slurry consolute of tabetisol sedimentation, forms containing solid nitre solution high, to enter subsequent processing in consolute device.
Further, it is salt made from earth containing a comparatively high percentage of sodium chloride saturated solution and/or dense salt made from earth containing a comparatively high percentage of sodium chloride water altogether that nitre liquid is melted in the molten nitre liquid pipe road.
Further, grid is additionally provided with the consolute device, nitre slurry flow channel stretches into the lower section of grid in consolute device, melts
Nitre liquid enters from grid bottom in consolute device all the way, is flowed out from grid top in consolute device containing nitre solution admittedly high.
Further, fluid level controller is connected with the molten nitre groove, to ensure the mirabilite hydrate in solid phase area with melting
Molten nitre liquid phase contact in area.
Further, differential temperature controller is connected between the molten nitre groove and consolute device, it is other on molten nitre liquid pipe road to be connected to stream
Amount adjuster, the shunting for realizing molten nitre liquid pipe road two-way flow.
2nd, the utility model separately provides a kind of device of mirabilite hydrate dehydration glauber salt processed in chlor-alkali production, including：
Molten nitre unit：The molten nitre being dehydrated involved by glauber salt processed based on mirabilite hydrate in a kind of above-mentioned chlor-alkali production is set
It is standby, under the conditions of additional molten nitre liquid, consolute after mirabilite hydrate is first melted, formation be precipitated with part glauber salt containing solid height
Nitre solution；
Intensification unit：It includes heater block and nitre NaOH solution tank NaOH high, and heater block is to molten nitre equipment outlet containing nitre admittedly high
Acid solution rises gentle temperature control, forms nitre solution high, and be stored in nitre NaOH solution tank NaOH high：
Salting-out crystallizer：For receiving the nitre solution high in nitre NaOH solution tank NaOH high, it is set to mix in proportion with solid NaCl, will
Mirabilite hydrate is separated out in the form of glauber salt；
Solid-liquid separator：For the material after salting-out crystallization to be carried out into separation of solid and liquid, wet glauber salt and bright containing a small amount of unit is obtained
The salt made from earth containing a comparatively high percentage of sodium chloride of powder saturated solution altogether, solid-liquid separator is provided with solid matter outlet and liquid material outlet, and wet glauber salt is from solid
Material outlet flows out, and saturated solution exports outflow to the salt made from earth containing a comparatively high percentage of sodium chloride containing a small amount of glauber salt from liquid material altogether；
And drier：For wet glauber salt to be dried, glauber salt is made.
Further, also include：Freezing denitration unit：For reclaiming settlement separator liquid material exit, salt made from earth containing a comparatively high percentage of sodium chloride is common
Undecomposed Na in saturated solution2SO4, the salt made from earth containing a comparatively high percentage of sodium chloride another molten nitre liquid as molten nitre unit of saturated solution altogether separates reuse all the way to melting
Nitre unit.
Further, also include：Salt Water circulation unit：Chlor-alkali devices are removed for reclaiming the poor salt made from earth containing a comparatively high percentage of sodium chloride water after freezing denitration
Salt dissolving, chlor-alkali system is entered as caustic soda raw material.
Further, the heater block is heat exchanger, and there is heat exchanger heat transfer medium inlet and heat transfer medium to go out
Mouthful, heat transfer medium inlet, heat transfer medium outlet are connected to electrolytic cell and go on the light salt brine pipeline of embrane method denitration unit.
Mirabilite hydrate is dehydrated the device of glauber salt processed in a kind of chlor-alkali production of the present utility model, and its course of work is described such as
Under：
A. nitre is melted：It is bright that molten nitre process is based on mirabilite hydrate dehydration system unit in a kind of chlor-alkali production described in claim 1 or 2
Molten nitre equipment involved by powder, comprises the following steps during molten nitre：1. by mirabilite hydrate heap to molten nitre groove solid phase area, 2. 40 DEG C -70
DEG C molten nitre liquid point two-way：Inject all the way in molten nitre groove melting zone, by from upper and solid mirabilite hydrate that come is melt into nitre slurry；It is another
Consolute device is removed on road, starches abundant consolute with the nitre from melting zone in consolute device, formation be precipitated with part glauber salt containing solid height
Nitre solution；
B. heat temperature raising：Using directly heating or indirect heating manner, will be heated to containing solid nitre solution high described in step a
60-70 DEG C, nitre solution high is formed, stored standby；
C. salting-out crystallization：After nitre solution high mixes in proportion with solid NaCl described in step b, salting-out crystallization, ten water awns
Nitre is separated out in the form of glauber salt；
D. separation of solid and liquid, drying：By the material after step c salting-out crystallizations through separation of solid and liquid, wet glauber salt is obtained and containing few
Measure the salt made from earth containing a comparatively high percentage of sodium chloride of glauber salt saturated solution altogether, wet glauber salt dry after product；
E. denitration is freezed：By salt made from earth containing a comparatively high percentage of sodium chloride described in step d, saturated solution divides two-way altogether, all the way as the molten nitre liquid of step a, melt back
Nitre equipment melts nitre again, and another road is gone to freeze denitration, reclaims undecomposed Na2SO4；
F. salt Water Sproading：The poor salt made from earth containing a comparatively high percentage of sodium chloride water that step e is freezed after denitration is gone into chlor-alkali devices salt dissolving, is entered as caustic soda raw material
Chlor-alkali system.
Tetra- steps of above-mentioned steps a to step d are steps necessary, and step e, step f are optional step.
Further, Na in dense salt made from earth containing a comparatively high percentage of sodium chloride water2SO4During the g/L of content≤70, using salt made from earth containing a comparatively high percentage of sodium chloride is reclaimed, saturated solution is followed step a altogether
Ring is used；Na in dense salt made from earth containing a comparatively high percentage of sodium chloride water2SO4During content 70 g/L of ＞, dense salt made from earth containing a comparatively high percentage of sodium chloride water or dense salt made from earth containing a comparatively high percentage of sodium chloride water and salt made from earth containing a comparatively high percentage of sodium chloride altogether saturated solution press than
Example is added.
Further, in step c：First nitre solution high described in step b is mixed with molten nitre liquid, solid NaCl is again with a constant speed
Degree is continuously added to, to reach the purpose that solid NaCl slowly dissolves in system.
Further, in step c：The addition of solid NaCl is so that in supernatant of saltouing during NaCl contents≤common saturation degree
The 1% of NaCl contents is Con trolling index, finely tunes NaCl additional proportions.
Further, the flow of melting mirabilite hydrate is controlled by the temperature difference t of solution before and after molten nitre in the melting zone, is melted
Solution before and after nitre（I.e. containing solid between nitre solution high and molten nitre liquid）Temperature difference t control at 5 DEG C -15 DEG C.
Further, in step b, the light salt brine that embrane method denitration is gone from electrolysis is introduced（78 DEG C or so）, will using its waste heat
60-70 DEG C is heated to containing solid nitre solution high described in step a, nitre solution high is formed, stored standby.
The device and involved molten nitre of mirabilite hydrate dehydration glauber salt processed set in a kind of chlor-alkali production of the present utility model
Standby, produced beneficial effect is compared with prior art：
1st, the utility model realizes mirabilite hydrate salt condensation for removing water, and molten nitre step is crucial, by introducing 40 DEG C of -70 DEG C of salt made from earth containing a comparatively high percentage of sodium chloride
Common heat-carrying, loading fluid of the saturated solution as the whole dehydration of mirabilite hydrate, what is occurred when mirabilite hydrate is melted is difficult
The solid-liquid change of control is converted into the easily-controllable state of salt made from earth containing a comparatively high percentage of sodium chloride aqueous mixtures.Circulated to realize heat with salt made from earth containing a comparatively high percentage of sodium chloride aqueous mixtures
Dissolving in and separating out for transfer and material, completes the typical process flow that mirabilite hydrate is dehydrated glauber salt processed；Set in special molten nitre
In standby, melt nitre amount using temperature difference control and then realize solution Na2SO4Content, sal prunella ratio are until product quality all realizes precisely control
System.
2nd, it is impossible that the utility model solves mirabilite hydrate and directly heats melting mirabilite hydrate saturated solution and heat up again
Problem, circulation can reach 33.79% to the molten nitre yield of hot method every time, this technique one cycle just recyclable more than 90%
Na2SO4；Nitre crystallization is melted in saturated solution intensification to salt made from earth containing a comparatively high percentage of sodium chloride again altogether after solving the problems, such as to saltout；The common molten thing containing solid salt made from earth containing a comparatively high percentage of sodium chloride is solved to rise again
, there is solute transfer in Wen Shi, solution reaches the crystallization of saturation state firing equipment, blocks, produces and cannot continuously transport between solid liquid phase
Capable situation, realizes continuous, safe and stable running status.Reduced investment, operation temperature is low, and material corrosion is poor, equipment system
Make low cost.
3rd, the utility model technological operation is simple, plant running stabilization, creatively in embrane method denitration unit and whole chlorine
Alkali system globe area together, compensate for the part of production of its missing, be chlor-alkali enterprises caustic soda, purified salt, glauber salt coproduction,
The cheap SO high in underground4 2-Bittern large-scale use has started a brand-new production technology.
4th, the utility model energy-conservation, eliminates mirabilite hydrate and is dehydrated all of vapo(u)rization system, operation temperature（40-70℃）
It is low, using low-grade heat source（Electrolysis carrys out 78 DEG C or so of light salt brine）Melting heats up, can steam saving compared with evaporation concentration method
It is more than 1400 kg/T glauber salt, for the NaCl that saltouts as caustic soda raw material reuse, in the absence of the consumption of material and energy.
5th, the utility model environmental protection, the material for participating in circulation includes moisture, without any consumption and discharge.
6th, the utility model product crystalline particle control process stabilization is reasonable, and particle is big and uniform, can reach glauber salt I
Quality standard more than class goods of inferior quality.
Brief description of the drawings
Accompanying drawing 1 is the structural representation of molten nitre equipment of the present utility model；
Accompanying drawing 2 is the use flow chart of the utility model device；
Accompanying drawing 3 is the structural representation of the utility model device.
In figure, 1, molten nitre groove, 2, melting zone, 3, grid, 4, solid phase area, 5, molten nitre device, 6, nitre slurry flow channel, 7, molten nitre
Liquid pipe road.
Specific embodiment
1-3, the dress of glauber salt processed is dehydrated to mirabilite hydrate in a kind of chlor-alkali production of the present utility model below in conjunction with the accompanying drawings
Put and involved molten nitre equipment is described in detail below.
Embodiment one（Molten nitre equipment）
As shown in Figure 1, mirabilite hydrate is dehydrated melting involved by glauber salt processed in a kind of chlor-alkali production of the present utility model
Nitre equipment, including：Molten nitre groove 1, consolute device 5 and molten nitre liquid pipe road 7, the grid 3 in the molten nitre groove 1 separate its inner chamber
It is solid phase area 4 and melting zone 2, and solid phase area 4 is located at the top of melting zone 2, mirabilite hydrate is piled up in solid phase area 4, melts nitre device warp
Nitre slurry flow channel 6 is connected with the bottom of melting zone 2, described 7 points of two-way in molten nitre liquid pipe road：
Wherein enter in melting zone 2 all the way, contacted with the mirabilite hydrate being deposited in solid phase area 4 from bottom to top, in solid-liquid
Melted at contact surface, melt formed nitre slurry and enter melting zone 2 from the gap of grid 3；Another road enters in consolute device 5,
Consolute is starched with the nitre settled from melting zone 2, is formed in consolute device 5 containing solid nitre solution high, to enter subsequent processing.
Liquid is the salt made from earth containing a comparatively high percentage of sodium chloride common saturated solution of saturated solution, dense salt made from earth containing a comparatively high percentage of sodium chloride water or salt made from earth containing a comparatively high percentage of sodium chloride and dense nitre altogether in above-mentioned molten nitre liquid pipe road 7
The mixed liquor of salt solution.
On the basis of said structure, in order that abundant consolute between nitre liquid is starched and melted to nitre, grid is additionally provided with consolute device 5
3, nitre slurry flow channel 6 stretches into the lower section of grid 3 in consolute device 5, and molten nitre liquid enters from the bottom of grid 3 in consolute device 5, containing solid height
Nitre solution flows out from the top of grid 3 in consolute device 5.
On the basis of said structure, in order to ensure the mirabilite hydrate in solid phase area 4 connects with the molten nitre liquid phase in melting zone 2
Touch, fluid level controller is connected with molten nitre groove 1.
On the basis of said structure, for the ease of control containing Na in solid nitre solution high2SO4Content, melt nitre groove 1 and mixed
Differential temperature controller is connected between molten device 5.Flow regulator is serially connected with respectively on the two-way in molten nitre liquid pipe road 7, is used to adjust molten
Nitre liquid enters the flow of melting zone 2 and consolute device 5.
Embodiment two（Mirabilite hydrate is dehydrated the device of glauber salt processed in chlor-alkali production）
As shown in accompanying drawing 1,3, mirabilite hydrate is dehydrated the device of glauber salt processed, bag in a kind of chlor-alkali production of the present utility model
Include：
Molten nitre unit：Molten nitre equipment based on embodiment one, under the conditions of additional molten nitre liquid, mirabilite hydrate first being melted
Melt rear consolute, formation be precipitated with part glauber salt containing nitre solution admittedly high；
Intensification unit：It includes heater block and nitre NaOH solution tank NaOH high, and heater block is to molten nitre equipment outlet containing nitre admittedly high
Acid solution rises gentle temperature control, forms nitre solution high, and be stored in nitre NaOH solution tank NaOH high：
Salting-out crystallizer：For receiving the nitre solution high in nitre NaOH solution tank NaOH high, it is set to mix in proportion with solid NaCl, will
Mirabilite hydrate is separated out in the form of glauber salt；
Solid-liquid separator：For the material after salting-out crystallization to be carried out into separation of solid and liquid, wet glauber salt and bright containing a small amount of unit is obtained
The salt made from earth containing a comparatively high percentage of sodium chloride of powder saturated solution altogether, solid-liquid separator is provided with solid matter outlet and liquid material outlet, and wet glauber salt is from solid
Material outlet flows out, and saturated solution exports outflow to the salt made from earth containing a comparatively high percentage of sodium chloride containing a small amount of glauber salt from liquid material altogether；
And drier：For wet glauber salt to be dried, glauber salt is made.
Above-mentioned molten nitre liquid is the mixing of the common saturated solution of salt made from earth containing a comparatively high percentage of sodium chloride common saturated solution, dense salt made from earth containing a comparatively high percentage of sodium chloride water or salt made from earth containing a comparatively high percentage of sodium chloride and dense salt made from earth containing a comparatively high percentage of sodium chloride water
Liquid.
On the basis of said structure, also include：Freezing denitration unit：For reclaiming the outlet of settlement separator liquid material
Place, undecomposed Na in the common saturated solution of salt made from earth containing a comparatively high percentage of sodium chloride2SO4, saturated solution is another as the molten nitre liquid for melting nitre unit altogether for salt made from earth containing a comparatively high percentage of sodium chloride, separates one
Road reuse is to molten nitre unit.
On the basis of said structure, also include：Salt Water circulation unit：Gone for reclaiming the poor salt made from earth containing a comparatively high percentage of sodium chloride water after freezing denitration
Chlor-alkali devices salt dissolving, chlor-alkali system is entered as caustic soda raw material.
On the basis of said structure, heater block is heat exchanger, and heat exchanger has heat transfer medium inlet and heat transfer
Media outlet, heat transfer medium inlet, heat transfer medium outlet are connected to electrolytic cell and go on the light salt brine pipeline of embrane method denitration unit.
Above-mentioned salting-out crystallizer, dryer configuration are known to the skilled person, intensification unit, freezing denitration unit and
Salt Water circulation cellular construction is also known to the skilled person, and will not be repeated here.
Embodiment three（Mirabilite hydrate is dehydrated the device course of work of glauber salt processed in chlor-alkali production）
As shown in accompanying drawing 1,2, the method that mirabilite hydrate is dehydrated glauber salt processed in a kind of chlor-alkali production of the present utility model should
Mirabilite hydrate that method isolates embrane method denitration through molten nitre, heat temperature raising to obtain nitre solution high, after through salting-out crystallization, solid
Liquid is separated, dry glauber salt, specifically includes following steps：
A. nitre is melted：Molten nitre process is based on the molten nitre equipment of embodiment one, comprises the following steps during molten nitre：1. by ten water awns
Nitre is by crane gear heap to the solid phase area 4 of molten nitre groove 1；2. 40 DEG C of molten nitre liquid are divided into two-way with the flow of 2.5 m3/h：Inject all the way
In the molten melting zone 2 of nitre groove 1, by from upper and solid mirabilite hydrate that come is immersed in molten nitre liquid, in molten nitre liquid infiltration from bottom to top
Under, mirabilite hydrate is melt into nitre slurry；Consolute device 5 is removed on another road, is fully carried out with the nitre slurry from melting zone 2 in consolute device 5
The exchange of heat and material, formation be precipitated with part glauber salt containing nitre solution admittedly high, the temperature difference t of solution before and after the molten nitre of control
=5 DEG C, it is made Na in solution2SO4Content is 83.26 g/L containing nitre solution admittedly high.
The selection principle of molten nitre liquid is in step a：Na in dense salt made from earth containing a comparatively high percentage of sodium chloride water2SO4During the g/L of content≤70, using recovery salt made from earth containing a comparatively high percentage of sodium chloride
Saturated solution is recycled altogether；Na in dense salt made from earth containing a comparatively high percentage of sodium chloride water2SO4During content 70 g/L of ＞, dense salt made from earth containing a comparatively high percentage of sodium chloride water or dense salt made from earth containing a comparatively high percentage of sodium chloride water are total to salt made from earth containing a comparatively high percentage of sodium chloride
Saturated solution is proportionally added into.
B. heat temperature raising：Mode is directly heated using heater, 60 will be heated to containing nitre solution admittedly high from consolute device 5
DEG C, nitre solution high is formed, it is stored in standby in nitre NaOH solution tank NaOH high.
C. salting-out crystallization：By the nitre solution high from nitre NaOH solution tank NaOH high and vacuum refined salt in salting-out crystallizer in proportion
It is sufficiently mixed, through salting-out crystallization, mirabilite hydrate is separated out in the form of glauber salt.
In step c：First nitre solution high described in step b is mixed with molten nitre liquid, vacuum refined salt is continuous with certain speed again
Add, to reach the purpose that vacuum refined salt slowly dissolves in system.The addition of vacuum refined salt is so that in supernatant of saltouing
The 1% of NaCl contents is Con trolling index during NaCl contents≤common saturation degree, finely tunes NaCl additional proportions, to ensure that thenardite is produced
Solid salt is free of in product.
Free of contamination vacuum refined salt is placed in refined salt feed bin, is accurately measured by screw feeder and is delivered to salting-out crystallization
In device, salt feeding quantity is set with nitre slurry flow proportional regulation control sal prunella ratio.A sal prunella presented below than reference value：According to every
M3 nitre solution high adds the proportioning of 21 kg solid NaCl salting-out agents, and solid NaCl is continuously added to salt with the speed of 158.49 kg/h
In analysis crystallizer.
D. separation of solid and liquid, drying：By sedimentation separation, stiff in the material feeding settlement separator after step c salting-out crystallizations
Slurry enter centrifuge through nitre stock pump, centrifugation goes out wet glauber salt and the salt made from earth containing a comparatively high percentage of sodium chloride containing a small amount of glauber salt saturated solution, wet unit altogether
After bright dried bean noodles is dry sell outside product.
E. denitration is freezed：By salt made from earth containing a comparatively high percentage of sodium chloride described in step d, saturated solution divides two-way altogether, all the way as the molten nitre liquid of step a, melt back
Nitre equipment melts nitre again, and another road is gone to freeze denitration, reclaims undecomposed Na2SO4；
F. salt Water Sproading：The poor salt made from earth containing a comparatively high percentage of sodium chloride water that step e is freezed after denitration is gone into chlor-alkali devices salt dissolving, is entered as caustic soda raw material
Chlor-alkali system.
Example IV（Mirabilite hydrate is dehydrated the device course of work of glauber salt processed in chlor-alkali production）
As shown in accompanying drawing 1,2, the method that mirabilite hydrate is dehydrated glauber salt processed in a kind of chlor-alkali production of the present utility model should
Mirabilite hydrate that method isolates embrane method denitration through molten nitre, heat temperature raising to obtain nitre solution high, after through salting-out crystallization, solid
Liquid is separated, dry glauber salt, specifically includes following steps：
A. nitre is melted：Molten nitre process is based on the molten nitre equipment of embodiment one, comprises the following steps during molten nitre：1. by ten water awns
Nitre is by crane gear heap to the solid phase area 4 of molten nitre groove 1；2. 55 DEG C of molten nitre liquid are divided into two-way with the flow of 5 m3/h：Inject all the way molten
In the melting zone 2 of nitre groove 1, by from it is upper and come solid mirabilite hydrate be immersed in molten nitre liquid, from bottom to top molten nitre liquid infiltration under,
Mirabilite hydrate is melt into nitre slurry；Consolute device 5 is removed on another road, and heat is fully carried out with the nitre slurry from melting zone 2 in consolute device 5
With the exchange of material, formation be precipitated with part glauber salt containing nitre solution admittedly high, the temperature difference t=10 of solution before and after the molten nitre of control
DEG C, it is made Na in solution2SO4Content is 92.66 g/L containing nitre solution admittedly high.
The selection principle of molten nitre liquid is in step a：Na in dense salt made from earth containing a comparatively high percentage of sodium chloride water2SO4During the g/L of content≤70, using recovery salt made from earth containing a comparatively high percentage of sodium chloride
Saturated solution is recycled altogether；Na in dense salt made from earth containing a comparatively high percentage of sodium chloride water2SO4During content 70 g/L of ＞, dense salt made from earth containing a comparatively high percentage of sodium chloride water or dense salt made from earth containing a comparatively high percentage of sodium chloride water are total to salt made from earth containing a comparatively high percentage of sodium chloride
Saturated solution is proportionally added into.
B. heat temperature raising：The light salt brine that 78 DEG C of embrane method denitration or so are gone from electrolysis is introduced, will be from mixed using its waste heat
Melt device 5 is heated to 65 DEG C containing nitre solution admittedly high, forms nitre solution high, is stored in standby in nitre NaOH solution tank NaOH high.
C. salting-out crystallization：By the nitre solution high from nitre NaOH solution tank NaOH high and vacuum refined salt in salting-out crystallizer in proportion
It is sufficiently mixed, through salting-out crystallization, mirabilite hydrate is separated out in the form of glauber salt.
In step c：First nitre solution high described in step b is mixed with molten nitre liquid, vacuum refined salt is continuous with certain speed again
Add, to reach the purpose that vacuum refined salt slowly dissolves in system.The addition of vacuum refined salt is so that in supernatant of saltouing
The 1% of NaCl contents is Con trolling index during NaCl contents≤common saturation degree, finely tunes NaCl additional proportions, to ensure that thenardite is produced
Solid salt is free of in product.
Free of contamination vacuum refined salt is placed in refined salt feed bin, is accurately measured by screw feeder and is delivered to salting-out crystallization
In device, salt feeding quantity is set with nitre slurry flow proportional regulation control sal prunella ratio.A sal prunella presented below than reference value：According to every
M3 nitre solution high adds the proportioning of 21 kg solid NaCl salting-out agents, and solid NaCl is continuously added to the speed of 1116.98 kg/h
In salting-out crystallizer.
D. separation of solid and liquid, drying：By sedimentation separation, stiff in the material feeding settlement separator after step c salting-out crystallizations
Slurry enter centrifuge through nitre stock pump, centrifugation goes out wet glauber salt and the salt made from earth containing a comparatively high percentage of sodium chloride containing a small amount of glauber salt saturated solution, wet unit altogether
After bright dried bean noodles is dry sell outside product.
E. denitration is freezed：By salt made from earth containing a comparatively high percentage of sodium chloride described in step d, saturated solution divides two-way altogether, all the way as the molten nitre liquid of step a, melt back
Nitre equipment melts nitre again, and another road is gone to freeze denitration, reclaims undecomposed Na2SO4；
F. salt Water Sproading：The poor salt made from earth containing a comparatively high percentage of sodium chloride water that step e is freezed after denitration is gone into chlor-alkali devices salt dissolving, is entered as caustic soda raw material
Chlor-alkali system.
Embodiment five（Mirabilite hydrate is dehydrated the device course of work of glauber salt processed in chlor-alkali production）
As shown in accompanying drawing 1,2, the method that mirabilite hydrate is dehydrated glauber salt processed in a kind of chlor-alkali production of the present utility model should
Mirabilite hydrate that method isolates embrane method denitration through molten nitre, heat temperature raising to obtain nitre solution high, after through salting-out crystallization, solid
Liquid is separated, dry glauber salt, specifically includes following steps：
A. nitre is melted：Molten nitre process is based on the molten nitre equipment of embodiment one, comprises the following steps during molten nitre：1. by ten water awns
Nitre is by crane gear heap to the solid phase area 4 of molten nitre groove 1；2. 70 DEG C of molten nitre liquid are divided into two-way with the flow of 4 m3/h：Inject all the way molten
In the melting zone 2 of nitre groove 1, by from it is upper and come solid mirabilite hydrate be immersed in molten nitre liquid, from bottom to top molten nitre liquid infiltration under,
Mirabilite hydrate is melt into nitre slurry；Consolute device 5 is removed on another road, and heat is fully carried out with the nitre slurry from melting zone 2 in consolute device 5
With the exchange of material, formation be precipitated with part glauber salt containing nitre solution admittedly high, the temperature difference t=15 of solution before and after the molten nitre of control
DEG C, it is made Na in solution2SO4Content is 121.78 g/L containing nitre solution admittedly high.
The selection principle of molten nitre liquid is in step a：Na in dense salt made from earth containing a comparatively high percentage of sodium chloride water2SO4During the g/L of content≤70, using recovery salt made from earth containing a comparatively high percentage of sodium chloride
Saturated solution is recycled altogether；Na in dense salt made from earth containing a comparatively high percentage of sodium chloride water2SO4During content 70 g/L of ＞, dense salt made from earth containing a comparatively high percentage of sodium chloride water or dense salt made from earth containing a comparatively high percentage of sodium chloride water are total to salt made from earth containing a comparatively high percentage of sodium chloride
Saturated solution is proportionally added into.
B. heat temperature raising：The light salt brine that 78 DEG C of embrane method denitration or so are gone from electrolysis is introduced, will be from mixed using its waste heat
Melt device 5 is heated to 60 DEG C containing nitre solution admittedly high, forms nitre solution high, is stored in standby in nitre NaOH solution tank NaOH high.
C. salting-out crystallization：By the nitre solution high from nitre NaOH solution tank NaOH high and vacuum refined salt in salting-out crystallizer in proportion
It is sufficiently mixed, through salting-out crystallization, mirabilite hydrate is separated out in the form of glauber salt.
In step c：First nitre solution high described in step b is mixed with molten nitre liquid, vacuum refined salt is continuous with certain speed again
Add, to reach the purpose that vacuum refined salt slowly dissolves in system.The addition of vacuum refined salt is so that in supernatant of saltouing
The 1% of NaCl contents is Con trolling index during NaCl contents≤common saturation degree, finely tunes NaCl additional proportions, to ensure that thenardite is produced
Solid salt is free of in product.
Free of contamination vacuum refined salt is placed in refined salt feed bin, is accurately measured by screw feeder and is delivered to salting-out crystallization
In device, salt feeding quantity is set with nitre slurry flow proportional regulation control sal prunella ratio.A sal prunella presented below than reference value：According to every
M3 nitre solution high adds the proportioning of 44.83 kg solid NaCl salting-out agents, and solid NaCl is continuously added with the speed of 1212.54 kg/h
Enter in salting-out crystallizer.
D. separation of solid and liquid, drying：By sedimentation separation, stiff in the material feeding settlement separator after step c salting-out crystallizations
Slurry enter centrifuge through nitre stock pump, centrifugation goes out wet glauber salt and the salt made from earth containing a comparatively high percentage of sodium chloride containing a small amount of glauber salt saturated solution, wet unit altogether
After bright dried bean noodles is dry sell outside product.
E. denitration is freezed：By salt made from earth containing a comparatively high percentage of sodium chloride described in step d, saturated solution divides two-way altogether, all the way as the molten nitre liquid of step a, melt back
Nitre equipment melts nitre again, and another road is gone to freeze denitration, reclaims undecomposed Na2SO4；
F. salt Water Sproading：The poor salt made from earth containing a comparatively high percentage of sodium chloride water that step e is freezed after denitration is gone into chlor-alkali devices salt dissolving, is entered as caustic soda raw material
Chlor-alkali system.
It should be noted that mirabilite hydrate is dehydrated in the method for glauber salt processed in a kind of chlor-alkali production of the present utility model,
Tetra- steps of step a to step d are steps necessary, and step e, step f are optional step.The foregoing is only of the present utility model
Preferred embodiment, is not limited to the utility model.I.e. using step a to step d, step a to step e, step a extremely
The embodiment of step f should fall within protection domain of the present utility model.
The device and involved molten nitre of mirabilite hydrate dehydration glauber salt processed set in a kind of chlor-alkali production of the present utility model
Standby, its processing and fabricating is simple and convenient, processing and fabricating shown in by specification accompanying drawing.
In addition to the technical characteristic described in specification, the known technology of those skilled in the art is.
Claims (9)
1. mirabilite hydrate is dehydrated the molten nitre equipment involved by glauber salt processed in a kind of chlor-alkali production, it is characterised in that including：Molten nitre
Its inner chamber is divided into solid phase area and melting zone by groove, consolute device and molten nitre liquid pipe road, the grid in the molten nitre groove, and solid
Phase region is located at the top of melting zone, and mirabilite hydrate is piled up in solid phase area, and consolute device is through nitre slurry flow duct and the bottom of melting zone
It is connected, melts nitre liquid pipe road point two-way：
Wherein enter in melting zone all the way, contacted with the mirabilite hydrate being deposited in solid phase area from bottom to top, in solid-liquid contact face
Place melts, and melts formed nitre slurry and enters melting zone from grid gap；Another road enters in consolute device, and from melting zone
The nitre slurry consolute of sedimentation, forms containing solid nitre solution high, to enter subsequent processing in consolute device.
2. mirabilite hydrate is dehydrated the molten nitre equipment involved by glauber salt processed in a kind of chlor-alkali production according to claim 1,
Characterized in that, it is salt made from earth containing a comparatively high percentage of sodium chloride saturated solution and/or dense salt made from earth containing a comparatively high percentage of sodium chloride water altogether that nitre liquid is melted in the molten nitre liquid pipe road.
3. the molten nitre that mirabilite hydrate is dehydrated involved by glauber salt processed in a kind of chlor-alkali production according to claim 1 and 2 sets
Standby, it is characterised in that grid is additionally provided with the consolute device, nitre slurry flow channel stretches into the lower section of grid in consolute device, melts nitre
Liquid enters from grid bottom in consolute device all the way, is flowed out from grid top in consolute device containing nitre solution admittedly high.
4. the molten nitre that mirabilite hydrate is dehydrated involved by glauber salt processed in a kind of chlor-alkali production according to claim 1 and 2 sets
It is standby, it is characterised in that to be connected with fluid level controller on the molten nitre groove.
5. the molten nitre that mirabilite hydrate is dehydrated involved by glauber salt processed in a kind of chlor-alkali production according to claim 1 and 2 sets
It is standby, it is characterised in that to be connected with differential temperature controller between the molten nitre groove and consolute device, it is other on molten nitre liquid pipe road to be connected to for reality
Now melt the flow regulator of nitre liquid pipe road two-way flow shunt.
6. mirabilite hydrate is dehydrated the device of glauber salt processed in a kind of chlor-alkali production, it is characterised in that including：
Molten nitre unit：It is dehydrated involved by glauber salt processed based on mirabilite hydrate in a kind of chlor-alkali production described in claim 1 or 2
Molten nitre equipment, under the conditions of additional molten nitre liquid, consolute after the mirabilite hydrate come from embrane method denitration is first melted to form analysis
Go out to have part glauber salt containing nitre solution admittedly high；
Intensification unit：It includes heater block and nitre NaOH solution tank NaOH high, and heater block is to melting the molten containing nitric acid admittedly high of nitre equipment outlet
Liquid rises gentle temperature control, forms nitre solution high, and be stored in nitre NaOH solution tank NaOH high：
Salting-out crystallizer：For receiving the nitre solution high in nitre NaOH solution tank NaOH high, it is set to mix in proportion with solid NaCl, Jiang Shishui
Saltcake is separated out in the form of glauber salt；
Solid-liquid separator：For the material after salting-out crystallization to be carried out into separation of solid and liquid, wet glauber salt is obtained and containing a small amount of glauber salt
Salt made from earth containing a comparatively high percentage of sodium chloride saturated solution altogether, solid-liquid separator is provided with solid matter outlet and liquid material outlet, and wet glauber salt is from solid material
Outlet outflow, saturated solution exports outflow to the salt made from earth containing a comparatively high percentage of sodium chloride containing a small amount of glauber salt from liquid material altogether；
And drier：For wet glauber salt to be dried, glauber salt is made.
7. mirabilite hydrate is dehydrated the device of glauber salt processed in a kind of chlor-alkali production according to claim 6, it is characterised in that
Also include：
Freezing denitration unit：It is undecomposed in the common saturated solution of salt made from earth containing a comparatively high percentage of sodium chloride for reclaiming settlement separator liquid material exit
Na2SO4, saturated solution is another as the molten nitre liquid for melting nitre unit altogether for salt made from earth containing a comparatively high percentage of sodium chloride, separates reuse all the way to molten nitre unit.
8. mirabilite hydrate is dehydrated the device of glauber salt processed in a kind of chlor-alkali production according to claim 7, it is characterised in that
Also include：
Salt Water circulation unit：Chlor-alkali devices salt dissolving is gone for reclaiming the poor salt made from earth containing a comparatively high percentage of sodium chloride water after freezing denitration, is entered as caustic soda raw material
Chlor-alkali system.
9. mirabilite hydrate is dehydrated the device of glauber salt processed in a kind of chlor-alkali production according to claim 6, it is characterised in that
The heater block is heat exchanger, and heat exchanger has heat transfer medium inlet and heat transfer medium outlet, and heat transfer medium enters
Mouthful, electrolytic cell is gone on the light salt brine pipeline of embrane method denitration unit during heat transfer medium outlet is connected to chlor-alkali production.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621387976.XU CN206308025U (en) | 2016-12-17 | 2016-12-17 | Mirabilite hydrate is dehydrated the device and involved molten nitre equipment of glauber salt processed in a kind of chlor-alkali production |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621387976.XU CN206308025U (en) | 2016-12-17 | 2016-12-17 | Mirabilite hydrate is dehydrated the device and involved molten nitre equipment of glauber salt processed in a kind of chlor-alkali production |
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| CN206308025U true CN206308025U (en) | 2017-07-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106745093A (en) * | 2016-12-17 | 2017-05-31 | 朱发彬 | Mirabilite hydrate is dehydrated the method and involved molten nitre equipment of glauber salt processed in a kind of chlor-alkali production |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106745093A (en) * | 2016-12-17 | 2017-05-31 | 朱发彬 | Mirabilite hydrate is dehydrated the method and involved molten nitre equipment of glauber salt processed in a kind of chlor-alkali production |
| CN106745093B (en) * | 2016-12-17 | 2019-04-30 | 朱发彬 | Mirabilite hydrate is dehydrated the method and related molten nitre equipment of anhydrous sodium sulphate processed in a kind of chlor-alkali production |
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