CN106395947A - Dual-medium evaporative crystallization device and process - Google Patents
Dual-medium evaporative crystallization device and process Download PDFInfo
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- CN106395947A CN106395947A CN201610955433.1A CN201610955433A CN106395947A CN 106395947 A CN106395947 A CN 106395947A CN 201610955433 A CN201610955433 A CN 201610955433A CN 106395947 A CN106395947 A CN 106395947A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/26—Multiple-effect evaporating
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- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The invention discloses a dual-medium evaporative crystallization device and process. The device is a multi-effect evaporative crystallization device and comprises a first effector, a second effector to an N-th effector of an evaporative crystallizer (N is not smaller than 3 and is not greater than 10), wherein evaporation medium charging openings are formed in optional two effectors of the evaporative crystallization device, solid discharging openings are formed in optional two effectors of the evaporative crystallization device, and the first, second and N-th effectors of the evaporative crystallizer jointly use one steam system. The evaporative crystallization process disclosed by the invention is ingenious in design, one evaporative crystallization device is saved, and thus energy saving is facilitated; the evaporative crystallization process is applied to the field of recovery of high-salt wastewater, the integrated process is of an assembly type, and evaporative crystallization operation on two kinds of salt-containing wastewater of different purities is completed by one device.
Description
Technical field
The present invention relates to the processing technology field of high salinity waste water, more particularly, to a kind of pair of medium evaporated crystallization device and work
Skill.
Background technology
Vaporizer is primarily adapted for use in evaporation and the crystallization that crystalline solid separates out solution, is widely used in chemical industry, metal
The smelting of mining industry, the pickle liquor of large-scale steel mill, wet desulphurization liquid waste processing of power plant etc., evaporative crystallization technique is one and becomes very much
Ripe technology, the research of its correlation and application are all than wide.At present, vaporizer on the market mainly have common vaporizer, three
Effect vaporizer, MVR vaporizer etc., triple effect evaporator and MVR vaporizer, due to can make full use of heat, are commercially applied
More.
In conventional vaporizer, a set of vaporizer is equipped with a set of crystallizer, and evaporative medium only has one kind.Many for producing
Plant the enterprise of high salinity waste water, a kind of medium of evaporation needs a set of crystallizing evaporator.Meanwhile, in the production technology stream of some enterprises
Cheng Zhong, is related to twice or even above twice evaporation and concentration.In these cases, enterprise needs to cover vaporizer investment construction more
With crystallizer, to meet the needs of production.
During the high salinity waste water recycling in the industries such as pesticide, printing and dyeing, medicine, need high salinity is given up
Water carries out condensing crystallizing, obtains the danger abraum salt containing large amount of organic, and danger abraum salt is after a whole set of process for refining more again molten
Solution evaporation, obtains the Nacl clean, resourcebility utilizes.Need in this process to carry out twice evaporation crystallization.For
This situation, the design of existing evaporated crystallization device needs two sets of vaporizers.
For this design, the drawbacks of have very big.On the one hand, increase investment construction cost, increase the occupation of land face of equipment
Long-pending；On the other hand heat resources is not made full use of, comparatively cause the waste of heat, increased enterprise's evaporative crystallization
Operating cost.Therefore, application does not meet environmental protection concept, its design not optimizes.
Patent CN 201420752788.7 discloses a kind of feeding manner, imitates the variable multiple-effect evaporation experimental provision of number, should
Device can adjust the effect number of feeding manner and multiple-effect evaporation according to practical situation, but, it is mainly applied to test first
Room, in real enterprise produces, the production of extension, the combination of device and assembling are easy to generation problem；Simultaneously, from this
From the point of view of the device of patent and technique, simply there are multiple changes in device on feed entrance point, for single assembly itself, it also exists
Single charging aperture is fed, and at least there is certain change on flow direction of material, and, for multiple different media, its
Itself it is can not to be fed simultaneously and process it is impossible to meet fuel requirements while medium.
Content of the invention
For above-mentioned problem, present invention aim at providing a kind of structure simple, convenient and energy-saving, it is simultaneously suitable for
The device of two media evaporative crystallization simultaneously.
In order to achieve the above object, the technical solution used in the present invention is as follows：A kind of pair of medium evaporated crystallization device, described
Double medium evaporated crystallization devices be multiple-effect evaporation crystallization apparatus, described device includes the first effect body of crystallizing evaporator, the
Two effect bodies imitate body, 3≤N≤10 to N, and any two effect body of evaporated crystallization device is provided with evaporative medium charging aperture, evaporation
Any two effect body of crystallization apparatus is provided with solid outlet, the first effect body of described crystallizing evaporator, the second effect body and
N effect body shares a set of vapour system.
One solid outlet of evaporated crystallization device of the present invention connects thickener, equipment for separating liquid from solid and drying
Device, another solid outlet of evaporated crystallization device connects thickener, equipment for separating liquid from solid, danger abraum salt refining plant and remove impurity
Device.
The discharging opening of knot screen of the present invention is connected to any one stock media charging of evaporated crystallization device
On mouth.
The invention provides a kind of be used for double medium evaporative crystallization techniques, this technique comprises the steps：
1）Open steam pipework, be the first effect body of crystallizing evaporator, the second effect body, N effect body heat supply, two of which evaporation is situated between
Matter charging aperture is separately positioned on A effect body and B effect body, and two solid outlets are separately positioned on C effect body and D effect body,
Wherein 1≤A, B, C, D≤N；
2）The high salinity that enterprise is produced, high organic wastewater imitate body through the A that charging aperture is passed through crystallizing evaporator, sequentially pass through
Effect body between A-C concentrates, and obtains solidliquid mixture, divide through thickener and solid-liquid on the solid matter outlet that C imitates body
After device process, obtain the higher danger abraum salt of harmful organic substance content；
3）By step 2）In the danger abraum salt that obtains through danger abraum salt refining plant, obtain the essence that content of organics is less than 20ppm
Salt manufacturing；
4）By step 3）In the purified salt that obtains again dissolve, through knot screen remove breeze in danger abraum salt and impurity from
Son, obtains clean saline solution；
5）By step 4）In the clean saline solution that obtains by another evaporative medium charging aperture be passed through B imitate evaporate in body dense
Contracting, after concentrating through the effect body between B-D, imitates, from D, the solidliquid mixture obtaining the solid matter outlet of body and is passed into stiff
In device, then after precipitation, solid-liquid separation, drying, obtain the Nacl clean, resourcebility utilizes.
Step 2 of the present invention）、5）In solid-liquid separation using centrifugation in the form of carry out solid-liquid separation.
Step 3 of the present invention）In separating organic matters device in using one-level be dried, two grades of thermal desorptions and（Or）Three
The technique of level calcining carries out the refined of abraum salt of endangering.In technique, salt refining technique can effectively remove the Organic substance in danger abraum salt.Danger is useless
Poisonous and hazardous Organic substance and foreign ion in a large number is mainly contained in salt.In danger abraum salt process for refining, it is dried through one-level
Afterwards, can remove the moisture in danger abraum salt, increase the mobility of salt, it is to avoid the generation of hardened phenomenon；After two grades of thermal desorptions
Can remove major part Organic substance；After three-level calcining, the Organic substance that removable thermal desorption can not remove.Finally, in danger abraum salt
Content of organics reaches the standard of industrial salt.In process for refining, temperature raises step by step, and heat makes full use of, if in heat
Corresponding standard can be reached after desorption, high-temperature calcination technique can be removed, if can not be up to standard after thermal desorption, also can reduce height
The operating cost of temperature calcining, economizes on resources, and reduces the load of equipment
Step 4 of the present invention）In knot screen in using following processing methods one or more：Filter, magnesium salt sinks
Shallow lake method, resin adsorption method, alkaline precipitation, sulphide precipitation and break point chlorination refine danger abraum salt.In impurity removal process, can be effective
Remove breeze, phosphorus, ammonia nitrogen, calcium and magnesium, heavy metal ion.In the saline solution again dissolving, without removal foreign ion, this
A little ions can enter in Nacl with evaporative crystallization, causes the purity of salt to decline.Therefore, in this stage, foreign ion is gone
Except the purity that can effectively improve salt, strengthen degree and the approach of its recycling, improve the economic value added of salt.
It is an advantage of the current invention that：The evaporative crystallization technique design of the present invention is ingenious, saves a set of evaporation crystallization equipment.?
In this technological process, theoretically need two sets of evaporated crystallization devices, that is, danger abraum salt evaporated crystallization device, industrial salt refining steam
Send out crystallization apparatus.But, pass through cleverly to design by patent of the present invention, Nacl refining crystallization be placed on a vaporizer
In, it is passed in the 2nd effect evaporator of danger abraum salt crystallization using the steam heat that it produces.This design not only can save one
Set evaporated crystallization device, can also avoid the pollution of Nacl refining crystallization, while fully meeting evaporation and require, reduce enterprise
The equipment investment cost of industry.
The medium of evaporation is double medium, has two sets of crystallization segregation apparatuss.In patent of the present invention, evaporative medium is different,
Medium in a number crystallizing evaporator is the saline solution after purified salt remove impurity, and Crystallization Separation solid out is can direct resource
Using industrial salt；Medium in triple effect evaporation crystallizer is high salinity, high organic wastewater, Crystallization Separation consolidating out
Body is the danger abraum salt containing harmful organic substance.In a whole set of vaporising device, steam heat resource makes full use of, two kinds of steaming method media
Crystallization be independent of each other.
Brief description
Fig. 1 is assembly of the invention and process flow diagram.
Specific embodiment
The present invention is described in further detail with specific embodiment for explanation below in conjunction with the accompanying drawings.
Embodiment 1：As shown in Figure 1：Mainly the high saliferous of insecticide factory's generation, high organic wastewater is adopted in this experiment,
The salinity of wherein waste water is 10%, and the concentration of Organic substance is 11053mg/L.The purpose of this this experiment is will be organic to high salinity, height
Thing waste water is converted into can solve the problems, such as wastewater problem and solid waste with the industrial salt of recycling simultaneously.
In double medium evaporated crystallization devices, crystallizing evaporator have three effect bodies, respectively first effect body, second effect body and
Triple effect body.It is provided with evaporative medium charging aperture on first effect body and the second effect body, the first effect body and triple effect body are provided with
Solid outlet.Wherein, the solid outlet on the first effect body is sequentially connected thickener, centrifugal separating device, drying device；The
Solid outlet on triple effect body is sequentially connected thickener, equipment for separating liquid from solid, danger abraum salt refining plant, knot screen.
The specific operating procedure that using this suit, waste water is carried out with handling process is as follows：
1）Open steam pipework, be the first effect body of crystallizing evaporator, the second effect body, triple effect body heat supply；
2）The high salinity that enterprise is produced, high organic wastewater imitate body, warp successively through charging aperture is passed through crystallizing evaporator second
Cross the concentration of the second effect body and triple effect body, solidliquid mixture is obtained on the solid matter outlet on triple effect body, through feeding-up
After thick device and centrifugal separating device process, obtain the danger abraum salt containing harmful organic substance；
3）By step 2）In the danger abraum salt that obtains through danger abraum salt refining plant, danger abraum salt refining plant include one-level be dried, two
Level thermal desorption, three-level calciner plant, the temperature that wherein one-level is dried is 150 degree, and the time of staying is 40min, two grades of thermal desorptions
Temperature is 350 degree, and the time of staying is 60min, and the temperature of three-level calcining is 500 degree, and the time of staying is 40min, has finally given
Machine thing content is the purified salt of 8ppm；
4）By step 5）In the purified salt that obtains again dissolve, through knot screen remove breeze in danger abraum salt and impurity from
Son, obtains clean saline solution.Wherein, go out breeze initially with the method filtering, secondly gone out using the method for magnesium salt precipitation
Dephosphorization, adopts alkaline precipitation to remove heavy metal element and calcium and magnesium again, is finally gone out ammonia nitrogen with the method for breakpoint chlorination again.
5）By step 4）In the clean saline solution that obtains enter into the by the evaporative medium charging aperture on the first effect body
Evaporation and concentration in one effect body, the solidliquid mixture that the solid outlet from the first effect body obtains is passed in thickener, then leads to
Centrifugal separating device, drying device, obtain the Nacl clean, resourcebility utilizes.
Crystallizing evaporator first imitate body, second effect body, triple effect body operational factor as shown in table 1.
The operational factor of each effect body of table 1 crystallizing evaporator is detailed
The purity index of the clean Nacl obtaining after treatment is as shown in table 2.
The purity analysis of table 2 refining industrial salt
.
Embodiment 2：The main high saliferous adopting insecticide factory to produce, high organic wastewater in this experiment, wherein waste water
Salinity is 10%, and the concentration of Organic substance is 11053mg/L.The purpose of this this experiment is will be direct to high salinity, high organic wastewater
It is converted into wastewater problem and solid waste can be solved the problems, such as with the industrial salt of recycling simultaneously.
In double medium evaporated crystallization devices, crystallizing evaporator have five effect bodies, respectively first effect body, second effect body,
Triple effect body, quadruple effect body and the 5th effect body.It is provided with evaporative medium charging aperture, the second effect body on first effect body and triple effect body
It is provided with solid outlet with the 5th effect body.Wherein, the solid outlet on the second effect body is sequentially connected thickener, centrifugation point
From device, drying device；Solid outlet on 5th effect body is sequentially connected thickener, equipment for separating liquid from solid, abraum salt of endangering refines
Device, knot screen.
The specific operating procedure that using this suit, waste water is carried out with handling process is as follows：
1）Open steam pipework, be the first effect body, the second effect body, triple effect body, quadruple effect body and the 5th effect of crystallizing evaporator
Body heat supply；
2）High salinity that enterprise is produced, high organic wastewater are passed through the triple effect body of crystallizing evaporator, warp successively through charging aperture
Cross the concentration of triple effect body, quadruple effect body and the 5th effect body, the solid matter outlet on the 5th effect body obtains solid-liquid mixing
Thing, after thickener and centrifugal separating device are processed, obtains the danger abraum salt containing harmful organic substance；
3）By step 2）In the danger abraum salt that obtains through danger abraum salt refining plant, danger abraum salt refining plant include one-level be dried, two
Level thermal desorption, three-level calciner plant, the temperature that wherein one-level is dried is 150 degree, and the time of staying is 40min, two grades of thermal desorptions
Temperature is 350 degree, and the time of staying is 40min, and the temperature of three-level calcining is 500 degree, and the time of staying is 30min, has finally given
Machine thing content is the purified salt of 9ppm；
4）By step 5）In the purified salt that obtains again dissolve, through knot screen remove breeze in danger abraum salt and impurity from
Son, obtains clean saline solution.Wherein, go out breeze initially with the method filtering, secondly gone out using the method for magnesium salt precipitation
Dephosphorization, adopts alkaline precipitation to remove heavy metal element and calcium and magnesium again, is finally gone out ammonia nitrogen with the method for breakpoint chlorination again.
5）By step 4）In the clean saline solution that obtains enter into the by the evaporative medium charging aperture on the first effect body
Evaporation and concentration in one effect body, through the evaporation and concentration of the first effect body and the second effect body, the solid outlet from the second effect body obtains
To solidliquid mixture be passed in thickener, more logical centrifugal separating device, drying device, obtain clean, resourcebility profit
Nacl.
The operational factor of each effect body of crystallizing evaporator is as shown in table 3.
The operational factor of each effect body of table 3 crystallizing evaporator is detailed
The purity index of the clean Nacl obtaining after treatment is as shown in table 4.
The purity analysis of table 4 refining industrial salt
.
Embodiment 3：High saliferous, the high organic wastewater, wherein waste water of pharmaceuticals's generation is mainly adopted in this experiment
Salinity be 13%, the concentration of Organic substance is 18755mg/L.The purpose of this this experiment is will be straight to high salinity, high organic wastewater
Switch through and turn to wastewater problem and solid waste can be solved the problems, such as with the industrial salt of recycling simultaneously.
In double medium evaporated crystallization devices, crystallizing evaporator have seven effect bodies, respectively first effect body, second effect body,
Triple effect body, quadruple effect body, the 5th effect body, the 6th effect body and the 7th effect body.It is provided with evaporation on triple effect body and the 7th effect body
Feed pipe inlet, the first effect body and quadruple effect body are provided with solid outlet.Wherein, the solid outlet on quadruple effect body according to
Secondary connection thickener, centrifugal separating device, drying device；Solid outlet on first effect body is sequentially connected thickener, solid-liquid
Segregation apparatuss, danger abraum salt refining plant, knot screen.
The specific operating procedure that using this suit, waste water is carried out with handling process is as follows：
1）Open steam pipework, be crystallizing evaporator first effect body, second effect body, triple effect body, quadruple effect body, the 5th effect
Body, the 6th effect body and the 7th effect body heat supply；
2）High salinity that enterprise is produced, high organic wastewater are passed through the triple effect body of crystallizing evaporator, warp successively through charging aperture
Cross the concentration of triple effect body, the second effect body and the first effect body, the solid matter outlet on the first effect body obtains solid-liquid mixing
Thing, after thickener and centrifugal separating device are processed, obtains the danger abraum salt containing harmful organic substance；
3）By step 2）In the danger abraum salt that obtains through danger abraum salt refining plant, danger abraum salt refining plant include one-level be dried, two
Level thermal desorption, three-level calciner plant, the temperature that wherein one-level is dried is 200 degree, and the time of staying is 30min, two grades of thermal desorptions
Temperature is 400 degree, and the time of staying is 50min, and the temperature of three-level calcining is 500 degree, and the time of staying is 50min, has finally given
Machine thing content is the purified salt of 7ppm；
4）By step 5）In the purified salt that obtains again dissolve, through knot screen remove breeze in danger abraum salt and impurity from
Son, obtains clean saline solution.Wherein, go out breeze initially with the method filtering, secondly gone out using the method for magnesium salt precipitation
Dephosphorization, adopts alkaline precipitation to remove heavy metal element and calcium and magnesium again, is finally gone out ammonia nitrogen with the method for breakpoint chlorination again.
5）By step 4）In the clean saline solution that obtains enter into the by the evaporative medium charging aperture on the 7th effect body
Evaporation and concentration in seven effect bodies, through the 7th evaporation and concentration imitating body, the 6th effect body, the 5th effect body and quadruple effect body, from quadruple effect
The solidliquid mixture that solid outlet on body obtains is passed in thickener, more logical centrifugal separating device, drying device, obtains
The Nacl clean, resourcebility utilizes.
The operational factor of each effect body of crystallizing evaporator is as shown in table 5.
Each effect running body parameter of table 5 crystallizing evaporator is detailed
The purity index of the clean Nacl obtaining after treatment is as shown in table 6.
The purity analysis of table 6 refining industrial salt
.
It should be noted that above-mentioned is only presently preferred embodiments of the present invention, not it is used for limiting the protection model of the present invention
Enclose, the combination in any made on the basis of above-described embodiment or equivalents belong to protection scope of the present invention.
Claims (9)
1. a kind of pair of medium evaporated crystallization device, described double medium evaporated crystallization devices are multiple-effect evaporation crystallization apparatus, and it is special
Levy and be, described device includes the first effect body of crystallizing evaporator, the second effect body imitates body, 3≤N≤10, evaporative crystallization to N
Any two effect body of device is provided with evaporative medium charging aperture, and any two effect body of evaporated crystallization device is provided with solid and goes out
Material mouth, the first of described crystallizing evaporator imitates body, and the second effect body and N effect body share a set of vapour system.
2. according to claim 1 pair of medium evaporated crystallization device it is characterised in that described evaporated crystallization device one
Individual solid outlet connects thickener, equipment for separating liquid from solid and drying device, and another solid outlet of evaporated crystallization device is even
Connect thickener, equipment for separating liquid from solid, danger abraum salt refining plant and knot screen.
3. according to claim 2 pair of medium evaporated crystallization device is it is characterised in that the discharging opening of described knot screen
It is connected on any one stock media charging aperture of evaporated crystallization device.
4. a kind of device according to claim 1 is used for double medium evaporative crystallization techniques it is characterised in that described technique
Comprise the steps：
1）Open steam pipework, be the first effect body of crystallizing evaporator, the second effect body, N effect body heat supply, two of which evaporation is situated between
Matter charging aperture is separately positioned on A effect body and B effect body, and two solid outlets are separately positioned on C effect body and D effect body,
Wherein 1≤A, B, C, D≤N；
2）The high salinity that enterprise is produced, high organic wastewater imitate body through the A that charging aperture is passed through crystallizing evaporator, sequentially pass through
Effect body between A-C concentrates, and obtains solidliquid mixture, divide through thickener and solid-liquid on the solid matter outlet that C imitates body
After device process, obtain the higher danger abraum salt of harmful organic substance content；
3）By step 2）In the danger abraum salt that obtains through danger abraum salt refining plant, obtain the essence that content of organics is less than 20ppm
Salt manufacturing；
4）By step 3）In the purified salt that obtains again dissolve, through knot screen remove breeze in danger abraum salt and impurity from
Son, obtains clean saline solution；
5）By step 4）In the clean saline solution that obtains by another evaporative medium charging aperture be passed through B imitate evaporate in body dense
Contracting, after concentrating through the effect body between B-D, imitates, from D, the solidliquid mixture obtaining the solid matter outlet of body and is passed into stiff
In device, then after precipitation, solid-liquid separation, drying, obtain the Nacl clean, resourcebility utilizes.
5. according to claim 4 pair of medium evaporative crystallization technique is it is characterised in that described step 2）、5）In consolidate
Liquid separates and carries out solid-liquid separation in the form of centrifugation.
6. according to claim 4 pair of medium evaporative crystallization technique is it is characterised in that described step 4）In danger abraum salt
In refining plant adopt one-level be dried, two grades of thermal desorptions and（Or）The technique of three-level calcining carries out refined danger abraum salt.
7. according to claim 4 pair of medium evaporative crystallization technique is it is characterised in that described step 4）In danger abraum salt
In refining plant：The temperature that one-level is dried is 100-200 degree, and the time of staying is 30-120min；The temperature of two grades of thermal desorptions is
300-400 degree, the time of staying is 30-120min；The temperature of three-level calcining is 400-600 degree, and the time of staying is 20-120min.
8. according to claim 4 pair of medium evaporative crystallization technique is it is characterised in that described step 4）In remove impurity dress
Put one or more using following processing methods middle：Filtration, the magnesium salt sedimentation method, resin adsorption method, alkaline precipitation, sulfide sink
Shallow lake method and break point chlorination remove foreign ion.
9. according to the double medium evaporative crystallization techniques described in claim 4 it is characterised in that described step 4）In knot screen
In, breeze adopts Filtration to remove；Phosphate anion adopts the magnesium salt sedimentation method to remove；Heavy metal ion is gone using alkaline precipitation
Remove；Calcium ions and magnesium ions adopt resin adsorption method to remove；Ammonia nitrogen adopts break point chlorination to remove.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018082343A1 (en) * | 2016-11-03 | 2018-05-11 | 南京格洛特环境工程股份有限公司 | Process for using organic high-salt wastewater to prepare industrial refined salt |
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| CN104649495A (en) * | 2015-02-13 | 2015-05-27 | 江苏中丹集团股份有限公司 | Chemical industrial waste salt refining process |
| CN204454673U (en) * | 2014-12-29 | 2015-07-08 | 上海神农机械有限公司 | Be applicable to the MVR evaporative crystallizer of saliferous containing the crystallization of organism Waste water concentrating |
| CN105254099A (en) * | 2015-10-22 | 2016-01-20 | 东华工程科技股份有限公司 | High-purity crystallization and salt-withdrawal process for coal chemical industry high-salinity waste water |
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| WO2000007945A1 (en) * | 1998-08-06 | 2000-02-17 | Federalnoe Gosudarstvennoe Unitarnoe Predpriyatie 'issledovatelsky Tsentr Imeni M.V.Keldysha' | Method for processing mineralised water |
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| WO2018082343A1 (en) * | 2016-11-03 | 2018-05-11 | 南京格洛特环境工程股份有限公司 | Process for using organic high-salt wastewater to prepare industrial refined salt |
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Application publication date: 20170215 |