CN110040697A - The processing method of titanium dioxide waste acid by sulfuric acid process - Google Patents
The processing method of titanium dioxide waste acid by sulfuric acid process Download PDFInfo
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Abstract
The invention belongs to titanium dioxide technical fields, and in particular to a kind of processing method of titanium dioxide waste acid by sulfuric acid process.Technical problem to be solved by the invention is to provide the processing methods of titanium dioxide waste acid by sulfuric acid process, comprising the following steps: two-step method: step 1: anhydrous sulfate and spent acid are mixed, placing, separation of solid and liquid obtains solution, and h 2 so 4 concentration is 35~38% in solution；Step 2: anhydrous sulfate and first step solution are mixed, place, separation of solid and liquid obtains solution, and h 2 so 4 concentration is 60~70% in solution；One-step method: anhydrous sulfate and spent acid are mixed, and are placed, and separation of solid and liquid obtains solution, and h 2 so 4 concentration is 60~70% in solution；The anhydrous sulfate is any one in anhydrous sodium sulfate or dead plaster.Waste acid treatment method provided by the invention not only efficiently utilizes scrap feed material caused by Producing Titanium Dioxide, but also can reduce the pressure caused by environment, improves operating environment, great prospects for commercial application.
Description
Technical field
The invention belongs to titanium dioxide technical fields, and in particular to a kind of processing method of titanium dioxide waste acid by sulfuric acid process.
Background technique
Titanium dioxide is a kind of excellent white pigment, is widely used in paint, coating, papermaking, plastics and electric welding at present
The industries such as item.
Currently, the technique of production titanium dioxide mainly has sulfuric acid process and chloridising, two kinds of techniques are simultaneously deposited, and production capacity and yield
It is very huge.However both production technologies all have certain environmental pressure, and for Production By Sulfuric Acid Process technique, production
Green vitriol (FeSO by a large amount of hydrolysis spent acid is generated and containing seven crystallizations water in the process4·7H2O).When (main with ilmenite concentrate
Wanting ingredient is metatitanic acid iron FeTiO3, wherein content of titanium dioxide is 45~50 weight %) and when being raw material, generally produce 1 ton of titanium
3.5~4 ton of seven inkstone of output is generated 7~8 tons of hydrolysis spent acid containing about 20% sulfuric acid by white powder.
There is processing difficulty in view of a large amount of green vitriols in European countries, therefore turn to chloridising production to avoid.This
Outside, high titanium slag is used to carry out Production By Sulfuric Acid Process for raw material, though the problem of can avoid green vitriol, the utilization of hydrolysis Waste Sulfuric Acid is still
In the presence of.
Due to too big using the waste sulfuric acid solution quantum of output of method for producing gtitanium dioxide with sulphuric acid by-product, and contain a certain amount of sulphur
It is sour ferrous, so that this waste sulfuric acid solution can not be utilized in other fields using dilute sulfuric acid.Currently, generalling use lime
This waste sulfuric acid solution is handled with the method that generates calcium sulfate in stone, so obtained from calcium sulfate there is no a utility value and
It can only store up, this does not utilize raw material not only well, but also biggish pressure can be caused to environment.
Positive method is when first passing through preliminary evaporation and concentration to improve the concentration of sulfuric acid to 30%~40%, to isolate
Ferrous sulfate；Further evaporation and concentration becomes 60% or more sulfuric acid, returns to acidolysis operation, uses for interruption acidolysis, thus
Completely utilized.But the corrosivity of sulfuric acid solution at high temperature is extremely strong, it is desirable that is worth higher graphite material, steams simultaneously
Hair concentration needs the steam boiler of large capacity, so that the equipment investment of this method is high and production cost is also high.From each factory
From the point of view of the application effect of family, the processing cost that the sulfuric acid concentration in spent acid doubles is about 1000 yuan/t, gelled acid per ton
Cost is even than (500~800 yuan/t98%H of fresh sulfuric acid2SO4) also want it is expensive very much, lead to the middle-size and small-size sulfuric acid of most domestic
Method titanium powder plant is not dared to inquire, and lime neutralisation is all made of.Moreover, the graphite heater in the presence of evaporating concentration process blocks
Problem could not also be completely resolved so far.
Summary of the invention
The present invention in order to overcome existing method processing method for producing gtitanium dioxide with sulphuric acid by-product waste sulfuric acid solution existing at least
One technical problem, and provide a kind of processing method of titanium dioxide waste acid by sulfuric acid process.
The method that the present invention handles titanium dioxide waste acid by sulfuric acid process, two-step method or one-step method, comprising the following steps:
Two-step method:
Step 1: anhydrous sulfate and spent acid are mixed, place, separation of solid and liquid obtains solution, and sulfuric acid quality is dense in solution
Degree is 35~38%；
Step 2: anhydrous sulfate and first step solution are mixed, place, separation of solid and liquid obtains solution, sulfuric acid in solution
Mass concentration is 60~70%；
One-step method:
Anhydrous sulfate and spent acid are mixed, placed, separation of solid and liquid obtains solution, in solution h 2 so 4 concentration be 60~
70%；The anhydrous sulfate is any one in anhydrous sodium sulfate or dead plaster.
Specifically, the spent acid is method for producing gtitanium dioxide with sulphuric acid by-product in the method for above-mentioned processing titanium dioxide waste acid by sulfuric acid process
Waste sulfuric acid solution.
Further, in the method for above-mentioned processing titanium dioxide waste acid by sulfuric acid process, sulfuric acid and ferrous sulfate are contained in the spent acid.
Further, in the method for above-mentioned processing titanium dioxide waste acid by sulfuric acid process, h 2 so 4 concentration is 17 in the spent acid
~20%, ferrous sulfate mass concentration is 2~3%.
Specifically, in the method for above-mentioned processing titanium dioxide waste acid by sulfuric acid process, when anhydrous sulfate is anhydrous sodium sulfate, two steps
The first step in method, every 100 parts by weight spent acid is corresponding to be added 45~50 parts by weight anhydrous sodium sulfates.
Specifically, in the method for above-mentioned processing titanium dioxide waste acid by sulfuric acid process, when anhydrous sulfate is anhydrous sodium sulfate, two steps
Second step in method, every 100 parts by weight first step solution is corresponding to be added 15~20 parts by weight anhydrous sodium sulfates.
Specifically, in the method for above-mentioned processing titanium dioxide waste acid by sulfuric acid process, when anhydrous sulfate is anhydrous sodium sulfate, a step
In method, every 100 parts by weight spent acid is corresponding to be added 55~60 parts by weight anhydrous sodium sulfates.
Preferably, in the method for above-mentioned processing titanium dioxide waste acid by sulfuric acid process, when anhydrous sulfate is anhydrous sodium sulfate, a step
In method, corresponding 60~70% sulfuric acid solutions that 100~110 parts by weight are added and are saturated by sodium sulphate of every 100 parts by weight spent acid.
Specifically, in the method for above-mentioned processing titanium dioxide waste acid by sulfuric acid process, when anhydrous sulfate is dead plaster, two steps
The first step in method, every 100 parts by weight spent acid is corresponding to be added 188~192 parts by weight dead plasters.
Specifically, in the method for above-mentioned processing titanium dioxide waste acid by sulfuric acid process, when anhydrous sulfate is dead plaster, two steps
Second step in method, every 100 parts by weight first step solution is corresponding to be added 160~165 parts by weight dead plasters.
Preferably, in the method for above-mentioned processing titanium dioxide waste acid by sulfuric acid process, when anhydrous sulfate is dead plaster, two steps
Second step in method, corresponding 100~110 parts by weight are added and are saturated by calcium sulfate 65~70% of every 100 parts by weight first step solution
Sulfuric acid solution
Specifically, in the method for above-mentioned processing titanium dioxide waste acid by sulfuric acid process, when anhydrous sulfate is dead plaster, a step
In method, every 100 parts by weight spent acid is corresponding to be added 268~272 parts by weight dead plasters.
Preferably, in the method for above-mentioned processing titanium dioxide waste acid by sulfuric acid process, when anhydrous sulfate is dead plaster, a step
In method, corresponding 65~70% sulfuric acid solutions that 300~310 parts by weight are added and are saturated by calcium sulfate of every 100 parts by weight spent acid.
Preferably, in the method for above-mentioned processing titanium dioxide waste acid by sulfuric acid process, in two-step method or one-step method, the placement temperature is
Room temperature.Standing time is 4~8h.
Specifically, in the method for above-mentioned processing titanium dioxide waste acid by sulfuric acid process, when anhydrous sulfate is anhydrous sodium sulfate, two steps
In method or one-step method, separation of solid and liquid obtained solid is sal glauberi.Further, the dry removing 10 of gained sal glauberi
It returns and uses after the crystallization water.Further, the drying is in 100~105 DEG C of drying and dehydratings.
Specifically, in the method for above-mentioned processing titanium dioxide waste acid by sulfuric acid process, when anhydrous sulfate is dead plaster, two steps
In method or one-step method, separation of solid and liquid obtained solid is calcium sulphate dihydrate.Further, the dry removing 2 of gained calcium sulphate dihydrate
It returns and uses after the crystallization water.Further, the drying is in 136~200 DEG C of drying and dehydratings.
Method provided by the invention using sodium sulphate or calcium sulfate concentration waste sulfuric acid solution, it is entirely avoided boiler and steaming
The use for sending out device, avoids the use of expensive resistant material, to reduce fixed investment, and the operation of every step is in room temperature
Lower progress, significantly improves operating condition in this way, but also the economy of Waste Sulfuric Acid concentration is improved.The method of the present invention is not
Useless raw material is only effectively utilized, but also can reduce the pressure caused by environment, improves operating environment, great industry is answered
Use prospect.
Specific embodiment
The method of sodium sulphate concentrated vitriol method titanium white waste acid, comprising the following steps:
Step 1: by anhydrous sodium sulfate (Na2SO4) be added in Waste Sulfuric Acid and mix and keep certain time, it is at this moment described useless
The concentration of sulfuric acid reaches 35~38 weight % in sulfuric acid, is then separated by solid-liquid separation the waste sulfuric acid solution, and solid phase is ten water
Sodium sulphate (Na2SO4·10H2O), use is returned after being removed the crystallization water；
Step 2: obtaining that anhydrous sodium sulfate (Na is added in liquid phase2SO4) mix and keep certain time, the at this moment sulfur waste
The concentration of sulfuric acid reaches 60~70 weight % in acid, is then separated by solid-liquid separation the waste sulfuric acid solution, and solid phase is ten water sulphur
Sour sodium (Na2SO4·10H2O), use is returned to after being removed the crystallization water, liquid phase returns to acidolysis and uses for interruption acidolysis.
The method of sodium sulphate concentrated vitriol method titanium white waste acid, comprising the following steps:
By anhydrous sodium sulfate (Na2SO4) be added in Waste Sulfuric Acid and mix and keep certain time, at this moment in the Waste Sulfuric Acid
The concentration of sulfuric acid reaches 60~70 weight %, is then separated by solid-liquid separation the waste sulfuric acid solution, and solid phase is sal glauberi
(Na2SO4·10H2O), use is returned to after being removed the crystallization water, liquid phase returns to acidolysis and uses for interruption acidolysis.It is solid in order to improve
1~1.1 times of Waste Sulfuric Acid of 60~70% sulfuric acid being saturated by sodium sulphate are added in mixing, in this way can for the performance of liquid separation
The rate of filtration is significantly increased.
Above-mentioned sal glauberi (Na2SO4·10H2O the crystallization water of 10 molecules of removing) is dried at 100~105 DEG C, becomes
It returns and uses for anhydrous sodium sulfate.
In the method for the present invention, 60~70% solution of gained h 2 so 4 concentration can return to acidolysis and use for interruption acidolysis.
In the method for the present invention, when sulfuric acid concentration reaches 35~38% or more in waste sulfuric acid solution, the sulfuric acid in solution is sub-
Iron forms crystallization water form, is present in solid by being separated by solid-liquid separation then to separate, gained sulphur last in the process of the present invention
Ferrous sulfate amount is few in acid solution, does not influence the subsequent return of acid solution and continues to use.
In the method for the present invention, in two-step method, improving sulfuric acid concentration by the first step is 35~38%, then sulphur in waste acid liquor
Sour ferrous formation crystallization water form, is present in solid by being separated by solid-liquid separation then to separate, and two-step method can reduce solid-to-liquid ratio, from
And improve strainability；It is in order to improve strainability, then preferred to need that 60~70% be saturated by sodium sulphate are added in one-step method
1~1.1 times of Waste Sulfuric Acid of 60~70% sulfuric acid being saturated by sodium sulphate are added in mixing for sulfuric acid solution, in this way can be substantially
Improve the rate of filtration in degree ground.60~70% sulfuric acid solution preparation methods being saturated by sodium sulphate are as follows: a certain amount of 60~
Sodium sulphate is dissolved in 70% sulfuric acid solution, until then preparing 60~70% sulfuric acid for obtaining being saturated by sodium sulphate when cannot dissolve
Solution.
The method of calcium sulfate concentrated vitriol method titanium white waste acid, comprising the following steps:
Step 1: by dead plaster (CaSO4) be added in Waste Sulfuric Acid and mix and keep certain time, it is at this moment described useless
The concentration of sulfuric acid reaches 35~38 weight % in sulfuric acid, is then separated by solid-liquid separation the waste sulfuric acid solution, and solid phase is two water
Calcium sulfate (CaSO4·2H2O), use is returned after being removed the crystallization water；
Step 2: obtaining that dead plaster (CaSO is added in liquid phase4) mix and keep certain time, the at this moment sulfur waste
The concentration of sulfuric acid reaches 60~70 weight % in acid, is then separated by solid-liquid separation the waste sulfuric acid solution, and solid phase is two water sulphur
Sour calcium (CaSO4·2H2O), use is returned to after being removed the crystallization water, liquid phase returns to acidolysis and uses for interruption acidolysis.In order to improve
1~1.1 times of first step solution of 65~70% sulfuric acid being saturated by calcium sulfate are added in mixing for the performance of separation of solid and liquid, this
The rate of filtration can be significantly increased in sample.
The method of calcium sulfate concentrated vitriol method titanium white waste acid, comprising the following steps:
By dead plaster (CaSO4) be added in Waste Sulfuric Acid and mix and keep certain time, at this moment in the Waste Sulfuric Acid
The concentration of sulfuric acid reaches 60~70 weight %, is then separated by solid-liquid separation the waste sulfuric acid solution, and solid phase is calcium sulphate dihydrate
(CaSO4·2H2O), use is returned to after being removed the crystallization water, liquid phase returns to acidolysis and uses for interruption acidolysis.In order to improve solid-liquid
3~3.1 times of Waste Sulfuric Acid of 65~70% sulfuric acid being saturated by calcium sulfate are added in mixing for isolated performance, in this way can be big
Improve the rate of filtration to amplitude.
Above-mentioned calcium sulphate dihydrate (CaSO4·2H2O the crystallization water of 2 molecules of removing) is dried at 136~200 DEG C, becomes
Dead plaster, which returns, to be used.
In the method for the present invention, 60~70% solution of gained h 2 so 4 concentration can return to acidolysis and use for interruption acidolysis.
In the method for the present invention, when sulfuric acid concentration reaches 35~38% or more in waste sulfuric acid solution, the sulfuric acid in solution is sub-
Iron forms crystallization water form, is present in solid by being separated by solid-liquid separation then to separate, gained sulphur last in the process of the present invention
Ferrous sulfate amount is few in acid solution, does not influence the subsequent return of acid solution and continues to use.
In the method for the present invention, in two-step method, improving sulfuric acid concentration by the first step is 35~38%, then sulphur in waste acid liquor
Sour ferrous formation crystallization water form, is present in solid by being separated by solid-liquid separation then to separate, and two-step method can reduce solid-to-liquid ratio, from
And improve strainability；It is in order to improve strainability, then preferred to need that 65~70% be saturated by calcium sulfate are added in one-step method
3~3.1 times of Waste Sulfuric Acid of 65~70% sulfuric acid being saturated by calcium sulfate are added in mixing for sulfuric acid solution, in this way can be substantially
Improve the rate of filtration in degree ground.65~70% sulfuric acid solution preparation methods being saturated by calcium sulfate are as follows: a certain amount of 65~
Calcium sulfate is dissolved in 70% sulfuric acid solution, until then preparing 65~70% sulfuric acid for obtaining being saturated by calcium sulfate when cannot dissolve
Solution.
Embodiment 1
100 grams of sulfate process titanium dioxides are hydrolyzed into spent acid, wherein containing 20% sulfuric acid and 2~3% ferrous sulfate.
The first step mixes at normal temperature with 48 grams of anhydrous sodium sulfates, keeps after a certain period of time, separation of solid and liquid obtains 59 grams of liquid
Phase, sulfuric acid concentration are increased to 35%；About 89 grams of solid phases are obtained, which is sal glauberi (Na2SO4·102O), at 100 DEG C
After the dry removing crystallization water, returns and use, be separated by solid-liquid separation and be very easy to.
10.5 grams of anhydrous sodium sulfates are added in second step in 59 grams of liquid phases, mix under room temperature, keep after a certain period of time, solid-liquid
Isolated 31 grams of liquid phases, sulfuric acid concentration are increased to 65%；About 38.5 grams of solid phases are obtained, which is sal glauberi
(Na2SO4·10H2O), after 100 DEG C of dry removing crystallizations water, return and use, be separated by solid-liquid separation and be easy.
The liquid phase for the h 2 so 4 concentration 65% that second step obtains can return to acidolysis and use for interruption acidolysis.
Embodiment 2
100 grams of sulfate process titanium dioxides are hydrolyzed into spent acid, wherein containing 20% sulfuric acid and 2~3% ferrous sulfate, with 58.9 grams
Anhydrous sodium sulfate mixes at normal temperature, keeps after a certain period of time, separation of solid and liquid obtains 31 grams of liquid phases, and sulfuric acid concentration is increased to
65%；About 127.9 grams of solid phases are obtained, which is sal glauberi (Na2SO4·10H2O), in 100 DEG C of dry removing crystallizations water
Afterwards, it returns and uses, but be separated by solid-liquid separation more difficult.
The liquid phase of the concentration 65% of acquisition can return to acidolysis and use for interruption acidolysis.
Embodiment 3
In order to improve separation of solid and liquid performance, 70% sulfuric acid is first prepared, and is saturated by sodium sulphate.
100 grams this 70% of sulfuric acid is added in sulfate process titanium dioxide hydrolysis spent acid to be mixed together.When suction filtration, the rate of filtration
Ten times or more are improved, after obtaining 100 grams of liquid phase deduction, the acid having more returns to acidolysis and uses for interruption acidolysis.
Embodiment 4
100 grams of sulfate process titanium dioxides are hydrolyzed into spent acid, wherein containing 20% sulfuric acid and 2~3% ferrous sulfate.
The first step mixes at normal temperature with 189 grams of dead plasters, keeps after a certain period of time, separation of solid and liquid obtains 50 grams of liquid
Phase, sulfuric acid concentration are increased to 35%；About 139 grams of solid phases are obtained, which is calcium sulphate dihydrate (CaSO4·2H2O), 136~
After 200 DEG C of dry removing crystallizations water, returns and use, be separated by solid-liquid separation and be very easy to.
81 grams of dead plasters are added in second step in 50 grams of liquid phases, mix under room temperature, keep after a certain period of time, solid-liquid point
From 28.5 grams of liquid phases are obtained, sulfuric acid concentration is increased to 65~70%；About 102.5 grams of solid phases are obtained, which is calcium sulphate dihydrate
(CaSO4·2H2O), after 136~200 DEG C of dry removing crystallizations water, return and use, it is more difficult to be separated by solid-liquid separation.
The liquid phase for the h 2 so 4 concentration 65% that second step obtains can return to acidolysis and use for interruption acidolysis.
Embodiment 5
100 grams of sulfate process titanium dioxides are hydrolyzed into spent acid, wherein containing 20% sulfuric acid and 2~3% ferrous sulfate, with 270 grams
Dead plaster (CaSO4) mix at normal temperature, it keeps after a certain period of time, separation of solid and liquid obtains 28.5 grams of liquid phases, sulfuric acid concentration
It is increased to 65~70%；About 341.5 grams of solid phases are obtained, which is calcium sulphate dihydrate (CaSO4·2H2O), at 136~200 DEG C
It after the dry removing crystallization water, returns and uses, but be separated by solid-liquid separation more difficult.
The liquid phase of the h 2 so 4 concentration 65% of acquisition can return to acidolysis and use for interruption acidolysis.
Embodiment 6
In order to improve separation of solid and liquid performance, 65~70% sulfuric acid is first prepared, and is saturated by calcium sulfate.
300 grams this 65~70% of sulfuric acid is added in 100 grams of sulfate process titanium dioxide hydrolysis spent acid to be mixed together.It filters
When, the rate of filtration improves ten times or more, and after obtaining 300 grams of liquid phase deduction, the acid having more returns to acidolysis and uses for interruption acidolysis.
Claims (8)
1. the method for handling titanium dioxide waste acid by sulfuric acid process, it is characterised in that: the following steps are included: two-step method or one-step method:
Two-step method:
Step 1: anhydrous sulfate and spent acid are mixed, place, separation of solid and liquid obtains solution, and h 2 so 4 concentration is in solution
35~38%；
Step 2: anhydrous sulfate and first step solution are mixed, place, separation of solid and liquid obtains solution, sulfuric acid quality in solution
Concentration is 60~70%；
One-step method:
Anhydrous sulfate and spent acid are mixed, placed, separation of solid and liquid obtains solution, in solution h 2 so 4 concentration be 60~
70%；The anhydrous sulfate is any one in anhydrous sodium sulfate or dead plaster.
2. the method for processing titanium dioxide waste acid by sulfuric acid process according to claim 1, it is characterised in that: the spent acid is sulfuric acid process
Prepare the waste sulfuric acid solution of titanium dioxide by-product；Further, sulfuric acid and ferrous sulfate are contained in the spent acid；Further,
H 2 so 4 concentration is 17~20% in the spent acid, and ferrous sulfate mass concentration is 2~3%.
3. the method for processing titanium dioxide waste acid by sulfuric acid process according to claim 1 or 2, it is characterised in that: work as anhydrous sulfate
When for anhydrous sodium sulfate, the first step in two-step method, every 100 parts by weight spent acid is corresponding to be added 45~50 parts by weight anhydrous sodium sulfates；
Second step in two-step method, every 100 parts by weight first step solution is corresponding to be added 15~20 parts by weight anhydrous sodium sulfates；
In one-step method, every 100 parts by weight spent acid is corresponding to be added 55~60 parts by weight anhydrous sodium sulfates；Or every 100 parts by weight are useless
Corresponding 60~70% sulfuric acid solutions that 100~110 parts by weight are added and are saturated by sodium sulphate of acid.
4. the method for processing titanium dioxide waste acid by sulfuric acid process according to claim 1 or 2, it is characterised in that: work as anhydrous sulfate
When for dead plaster, the first step in two-step method, every 100 parts by weight spent acid is corresponding to be added 188~192 parts by weight anhydrous slufuric acids
Calcium；Second step in two-step method, every 100 parts by weight first step solution is corresponding to be added 160~165 parts by weight dead plasters；Or
Corresponding 65~70% sulfuric acid solutions that 100~110 parts by weight are added and are saturated by calcium sulfate of every 100 parts by weight first step solution；
In one-step method, every 100 parts by weight spent acid is corresponding to be added 268~272 parts by weight dead plasters；Or every 100 parts by weight
Corresponding 65~70% sulfuric acid solutions that 300~310 parts by weight are added and are saturated by calcium sulfate of spent acid.
5. the method for processing titanium dioxide waste acid by sulfuric acid process according to any one of claims 1 to 4, it is characterised in that: two-step method
Or in one-step method, the placement temperature is room temperature；Standing time is 4~8h.
6. according to claim 1~3, method of 5 described in any item processing titanium dioxide waste acid by sulfuric acid process, it is characterised in that: work as nothing
When water sulfate is anhydrous sodium sulfate, in two-step method or one-step method, separation of solid and liquid obtained solid is sal glauberi；Further
, it returns and uses after gained sal glauberi 10 crystallizations water of dry removing；Further, the drying is 100~105
DEG C drying and dehydrating.
7. according to claim 1 or 2,4,5 it is described in any item processing titanium dioxide waste acid by sulfuric acid process methods, it is characterised in that: when
When anhydrous sulfate is dead plaster, in two-step method or one-step method, separation of solid and liquid obtained solid is calcium sulphate dihydrate；Further
, it returns and uses after gained calcium sulphate dihydrate 2 crystallizations water of dry removing；Further, the drying is 136~200
DEG C drying and dehydrating.
8. the method for described in any item processing titanium dioxide waste acid by sulfuric acid process according to claim 1~7, it is characterised in that: gained sulphur
Sour mass concentration is that 60~70% solution are directly returned for interruption acidolysis use.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114053759A (en) * | 2020-07-29 | 2022-02-18 | 北京紫光英力化工技术有限公司 | New process for adding salt and dehydrating water-containing organic matter |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114053759A (en) * | 2020-07-29 | 2022-02-18 | 北京紫光英力化工技术有限公司 | New process for adding salt and dehydrating water-containing organic matter |
| CN114053759B (en) * | 2020-07-29 | 2023-05-05 | 北京紫光英力化工技术有限公司 | New process for salt-adding and dehydration of water-containing organic matter |
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