CN109970078A - A method of decomposing organic matter in chemical industry abraum salt - Google Patents
A method of decomposing organic matter in chemical industry abraum salt Download PDFInfo
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- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D3/00—Halides of sodium, potassium or alkali metals in general
- C01D3/04—Chlorides
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
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Abstract
The invention belongs to chemical industry abraum salt resource reclaim technical field of comprehensive utilization, and in particular to a method of decompose organic matter in chemical industry abraum salt.This method comprises the following steps: (1) dry: chemical industry abraum salt is dried and dehydrated, and obtains crude salt 1；(2) level-one is calcined: crude salt 1 is 450~550 DEG C in temperature, progress level-one calcining under conditions of the time is 3~5min；Obtain crude salt 2；(3) second level is calcined: crude salt 2 is 650~750 DEG C in temperature, and progress second level calcining, obtains crude salt 3 under conditions of the time is 15~30min；This method can reach in abraum salt 99.99% organic matter removal, and the calcination temperature time is short, and energy consumption is few.
Description
Technical field
The invention belongs to chemical industry abraum salt resource reclaim technical field of comprehensive utilization, and in particular in a kind of decomposition chemical industry abraum salt
The method of organic matter.
Background technique
The abraum salt generated in face of increasingly stringent environmental protection policy, chemical industry, residue and vinasse have been processed into urgently
Problem to be solved.The main component of chemical industry abraum salt is sodium chloride, is broadly divided into single abraum salt, mixed salt and giving up containing organic matter
Salt.Wherein it is mingled with a large amount of organic substance in the abraum salt containing organic matter, it is also possible to the objects such as metal ion, hetero atom in entrainment
Matter belongs to harmful substance.Currently, in terms of abraum salt processing, mainly solidification landfill, solidification is the pollution in abraum salt in order to prevent
Object is diffused into soil.And due to the large bulk density of abraum salt after solidifying, corrosivity is strong, and landfill will appear after a long time in underground
Concrete curing deformation causes abraum salt infiltration to leak into soil.Therefore, land-fill method not only waste of resource, can also bring environment
Great pollution risk.
For this purpose, the organic matter in abraum salt is decomposed, it is converted to innocuous substance and is recycled and have become at abraum salt
The main direction of studying of reason.For example, Chinese patent CN108278613A discloses a kind of industrial dangerous waste salt disposition and recycling is returned
Receive the apparatus and method utilized comprising the industrial dangerous waste salt of certain mass S1: is placed in drying and dehydrating in drying device；S2:
The dangerous waste salt that S1 is obtained successively is passed through level-one carbonizing plant and depth carbonizing plant；S3: it will be evaporated during S1 and S2
Organic matter be passed through heating incinerator, temperature control burned at 1000-1100 DEG C the time be 3s or more after obtained flue gas be passed through
Heat exchanger, flue gas enter the gas obtained after heat exchanger and are passed through flue gas processing device, and the hot wind that heat exchanger generates passes sequentially through depth
Carbonizing plant, level-one carbonizing plant and drying device are spent, then is entered in heat exchanger by circulating fan；S4: by S2 through depth
Carbonated product after carbonization enters the dissolution of dissolution filter device, filtering, and the concentration for obtaining salt is controlled between 280-320g/L
After be passed through filtrate removal of impurities and refilter the further removal filtration of device and obtain filtrate, filtrate is entered into ion-membrane electrolysis device electrolysis,
NaCl solution is obtained, NaCl solution is electrolysed by ion-membrane electrolysis device, obtains NaOH solution, H2And Cl2, NaOH solution passes through
Evaporative crystallization obtains NaOH solid.The above method realizes the processing of organic matter in chemical industry abraum salt, however forges in this method technique
The burning time is long, and energy consumption is high, at high cost.
Summary of the invention
In view of the problems of the existing technology, the purpose of the present invention is to provide organic matters in a kind of decomposition chemical industry abraum salt
Method, this method less energy-consuming is at low cost, and the dry salt of the above highly industry of second level can be prepared by the method in chemical industry abraum salt.
For this purpose, technical solution provided by the invention is as follows:
A kind of chemical industry abraum salt refining methd, include the following steps: that (1) is dry: chemical industry abraum salt is dried and dehydrated, and obtains
Crude salt 1；(2) level-one is calcined: the crude salt 1 is 450~550 DEG C in temperature, and progress level-one is forged under conditions of the time is 3~5min
It burns；Obtain crude salt 2；(3) second level is calcined: the crude salt 2 is 650~750 DEG C in temperature, under conditions of the time is 15~30min
Second level calcining is carried out, crude salt 3 is obtained.
Preferably, temperature dry in the step (1) is 180~230 DEG C, and the time is 15~30s.
Preferably, temperature dry in the step (1) is 195~215 DEG C, and the time is 18~25s.
It is further preferred that the temperature that level-one is calcined in the step (2) is 500~520 DEG C, the time is 2~4min.
It is further preferred that the temperature that second level is calcined in the step (3) is 700~730 DEG C, the time is 20~25min.
Preferably, the chemical industry abraum salt as mass fraction, including sodium chloride 82%~96%, moisture 2.5%~7%,
Organic matter 0.11%~4%, sodium sulphate and other impurities 0.4%~3%.
It is further preferred that the chemical industry abraum salt is as mass fraction, including sodium chloride 85%~92%, moisture 3~
5%, organic matter 0.85%~3%, sodium sulphate and other impurities 0.5%~2%.
Technical solution of the present invention has the advantages that
1. the method provided by the invention for decomposing organic matter in chemical industry abraum salt, including drying, level-one calcining, second level calcining and
Prepare crystal salt process, drying can evaporation water and oxidative decomposing section low molecule organic matter, it is dry after crude salt forged through level-one
Decomposable or carbonization most organic is burnt, second level calcining realization is thoroughly decomposed or carbonization organic matter, and can reach will be in abraum salt
99.9% organic matter removal, and the calcination temperature time is short, energy consumption is few.
2. the method provided by the invention for decomposing organic matter in chemical industry abraum salt, is dried, moisture at a suitable temperature
Evaporation efficiency highest, evaporation energy consumption is minimum, and while reaching removing moisture, it is low molecular organic can to decompose part
Object reduces subsequent calcination energy consumption.
3. temperature controls not since, comprising organic matter, low-temperature eutectic principle causes the fusing point of abraum salt to reduce in chemical industry abraum salt
Good, will lead to abraum salt melts in a device, and chemical industry abraum salt refining methd provided by the invention is by selecting suitable calcining temperature
Range is spent, the organic matter in abraum salt is made to avoid abraum salt in calciner while sufficiently decomposing or be carbonized in critical-temperature
Melting, and then equipment will not be damaged, extend service life of equipment.
4. the method provided by the invention for decomposing organic matter in chemical industry abraum salt, suitable for each containing sodium chloride and sodium sulphate
Kind of mixed salt abraum salt, and by compatibility sodium chloride, moisture, organic matter, the ratio of sodium sulphate and other impurities can make to be prepared
Content of organics in abraum salt is relatively stable, avoids abraum salt in calciner because content of organics is inconsistent, organic matter divides
In-furnace temperature is fluctuated caused by the heat discharged in solution preocess is different, and abraum salt softening coking or organic matter is caused to be decomposed
Not exclusively.
Specific embodiment
To make the purpose of the present invention, technical solution and advantage are clearer, will do below to embodiment of the present invention into one
The detailed description of step.
The present invention provides a kind of methods of organic matter in decomposition chemical industry abraum salt, are primarily adapted for use in containing sodium chloride and sulphur
The various mixed salt abraum salts of sour sodium.Refining methd includes drying and dehydrating, obtains crude salt 1；Level-one is calcined: the crude salt 1 is in temperature
450~550 DEG C, progress level-one calcining under conditions of the time is 3~5min；Obtain crude salt 2；Second level calcining: the crude salt 2 is in temperature
Degree is 650~750 DEG C, and progress second level calcining, obtains crude salt 3 under conditions of the time is 15~30min.Using method of the invention
Can be by abraum salt 99.9% organic matter removal, and the calcination temperature time is short, energy consumption is few.
Dry temperature is 180~230 DEG C, preferably 195~215 DEG C in the present invention；Drying time is 15~30s, excellent
It is selected as 18~25s, dry in this temperature and time section, moisture evaporation rate highest, evaporation energy consumption is minimum, and is reaching removing
While moisture, the low molecular organic matter in part can be decomposed, reduces subsequent calcination energy consumption.Expansion drying can be selected in drying equipment
Machine.
Level-one calcination temperature is 450~550 DEG C in the present invention, and preferably 500~520 DEG C, calcination time is 3~5min,
It is preferred that the time is 2~4min；Second level calcining temperature be 650~750 DEG C, preferably 700~730 DEG C, calcination time be 15~
30min, preferably 20~25min；Level-one, which is calcined, can be selected level-one fluidized bed incinerator, and second level, which is calcined, can be selected two-stage rotary kiln
Calcining furnace.Due to abraum salt with after the decomposition or carbonization of the impurity such as organic matter fusing point gradually promoted, until close to pure salt fusing point,
Thus, it is calcined by the way of being gradually warmed up, wherein level-one calcines decomposable or most of organic matter that is carbonized, and second level is forged
It burns achievable thorough decomposition or carbonization organic matter, the mode being gradually warmed up can be by abraum salt 99.9% organic matter removal.
In the present invention, the abraum salt as mass fraction, including sodium chloride 82~96%, moisture 2.5~7%, organic matter
0.11~4%, sodium sulphate and other impurities 0.4~3% are preferably in a proportion of sodium chloride 85%~92%, moisture 3~5% is organic
Object 0.85%~3%, sodium sulphate and other impurities 0.5%~2%.Since organic matter decomposable process is also a release heat
Process, by material combination, with abraum salt in content of organics it is relatively stable, can avoid abraum salt in calciner because
In-furnace temperature is fluctuated caused by content of organics is inconsistent, and then avoids the softening coking of abraum salt caused by temperature height,
Temperature is low to be unfavorable for the problem of organic matter decomposes carbonization.And ingredient in abraum salt is defined, into abraum salt processing system phase
To more stable, be conducive to the stable operation of system, and can stablize using the heat discharged in organic matter decomposable process, reaches section
The purpose of energy；And it can realize the processing of the multiple batches of abraum salt of different manufacturers.
Embodiment 1
A kind of chemical industry abraum salt refining methd is present embodiments provided, including the side for decomposing organic matter in chemical industry abraum salt
Method, abraum salt source Mr. Yu chemical plant company, it is as shown in table 1 below to be detected ingredient in its abraum salt:
Table 1
Note: " < (X) " indicates that test result is lower than detection limit (X), i.e., does not detect.
The method and abraum salt subtractive process for decomposing organic matter in chemical industry abraum salt are as follows:
(1) dry: abraum salt 100kg to be put into flash dryer, dry 30s, removing under conditions of temperature is 180 DEG C
Moisture in abraum salt simultaneously decomposes part low molecule organic matter and obtains crude salt 1；
(2) level-one calcine: crude salt 1 enters in level-one fluidized bed incinerator, temperature be 500 DEG C under conditions of carbonization or
3min is decomposed, most organic of decomposing or be carbonized obtains crude salt 2；
(3) second level is calcined: crude salt 2 is entered in two-stage rotary kiln calcining furnace and is calcined, and temperature is calcined under conditions of being 750 DEG C
15min obtains crude salt 3；
(4) crystal salt is prepared: dissolution: after crude salt 3 adds water to be completely dissolved；Divide salt: barium chloride solution is quantitatively added dropwise and forms sulphur
Sour precipitated barium；Filtering: clear liquid dispels impurity through nanometer scale ceramics membrane filter system, obtains salt water；Heavy metals removal: detection salt water
In heavy metal ion content select 12% sodium hydroxide solution to adjust the pH value of salt water to 7.5 as shown in table 1, it is quantitative plus
Enter the Na that mass fraction is 10%2S solution forms precipitating, by salt water by filtration system removing precipitating, removes removing heavy metals, obtains
To clear brine；Evaporative crystallization: clear brine enters multi-effect evaporation system, obtains crystal salt；
(5) crystal salt is dry: crystal salt enters back into fluid bed dryer evaporation after two-stage screw centrifuge gets rid of moisture removal
Moisture obtains Nacl.
Embodiment 2
A kind of chemical industry abraum salt refining methd is present embodiments provided, including the side for decomposing organic matter in chemical industry abraum salt
Method, abraum salt source Mr. Yu chemical plant company, it is as shown in table 2 below to be detected ingredient in its abraum salt:
Table 2
Note: " < (X) " indicates that test result is lower than detection limit (X), i.e., does not detect.
The method and abraum salt subtractive process for decomposing organic matter in chemical industry abraum salt are as follows:
(1) dry to make an uproar: abraum salt 100Kg to be put into flash dryer, dry 15s, removing under conditions of temperature is 230 DEG C
Moisture in abraum salt simultaneously decomposes part low molecule organic matter and obtains crude salt 1；
(2) level-one calcine: crude salt 1 enters in level-one fluidized bed incinerator, temperature be 520 DEG C under conditions of carbonization or
4min is decomposed, most organic of decomposing or be carbonized obtains crude salt 2；
(3) second level is calcined: crude salt 2 is entered in two-stage rotary kiln calcining furnace and is calcined, and temperature is calcined under conditions of being 700 DEG C
28min obtains crude salt 3；
(4) crystal salt is prepared: dissolution: after crude salt 3 adds water to be completely dissolved；Divide salt: quantitative chlorine adds barium chloride solution to form sulphur
Sour precipitated barium；Filtering: clear liquid dispels impurity through nanometer scale ceramics membrane filter system, obtains salt water；Heavy metals removal: detection salt water
In heavy metal ion content, as shown in table 2, select 10% hydrochloric acid solution adjust salt water pH value to 7.2, be quantitatively adding matter
Measure the Na that score is 12%2S solution forms precipitating, by salt water by filtration system removing precipitating, removes removing heavy metals, obtains pure
Net salt water；Clear brine enters multi-effect evaporation system, obtains crystal salt；
(5) crystal salt is dry: crystal salt enters back into fluid bed dryer evaporation after two-stage screw centrifuge gets rid of moisture removal
Moisture obtains Nacl.
Embodiment 3
A kind of chemical industry abraum salt refining methd is present embodiments provided, including the side for decomposing organic matter in chemical industry abraum salt
Method, abraum salt source Mr. Yu chemical plant company, it is as shown in table 3 below to be detected ingredient in its abraum salt:
Table 3
Note: " < (X) " indicates that test result is lower than detection limit (X), i.e., does not detect.
The method and abraum salt subtractive process for decomposing organic matter in chemical industry abraum salt are as follows:
(1) dry: abraum salt 100Kg to be put into flash dryer, dry 18s, removing under conditions of temperature is 200 DEG C
Moisture in abraum salt simultaneously decomposes part low molecule organic matter and obtains crude salt 1；
(2) level-one calcine: crude salt 1 enters in level-one fluidized bed incinerator, temperature be 480 DEG C under conditions of carbonization or
5min is decomposed, most organic of decomposing or be carbonized obtains crude salt 2；
(3) second level is calcined: crude salt 2 is entered in two-stage rotary kiln calcining furnace and is calcined, and temperature is calcined under conditions of being 720 DEG C
25min obtains crude salt 3；
(4) crystal salt is prepared: dissolution: after crude salt 3 adds water to be completely dissolved；Divide salt: barium chloride solution is quantitatively added dropwise and forms sulphur
Sour precipitated barium；Filtering: clear liquid dispels impurity through nanometer scale ceramics membrane filter system and obtains salt water；Heavy metals removal: detection salt water
In heavy metal ion content, as shown in table 3, select 7% hydrochloric acid melt adjust salt water pH value to 7.2, be quantitatively adding matter
Measure the Na that score is 8%2S solution forms precipitating, by salt water by filtration system removing precipitating, removes removing heavy metals, obtains pure
Salt water；Clear brine enters multi-effect evaporation system, obtains crystal salt；
(5) crystal salt is dry: crystal salt enters back into fluid bed dryer evaporation after two-stage screw centrifuge gets rid of moisture removal
Moisture obtains Nacl.
Embodiment 4
A kind of chemical industry abraum salt refining methd is present embodiments provided, including the side for decomposing organic matter in chemical industry abraum salt
Method, abraum salt source Mr. Yu chemical plant company, it is as shown in table 4 below to be detected ingredient in its abraum salt:
Table 4
Note: " < (X) " indicates that test result is lower than detection limit (X), i.e., does not detect.
The method and abraum salt subtractive process for decomposing organic matter in chemical industry abraum salt are as follows:
(1) dry: abraum salt 100kg to be put into flash dryer, dry 17s, removing under conditions of temperature is 220 DEG C
Moisture in abraum salt simultaneously decomposes part low molecule organic matter and obtains crude salt 1；
(2) level-one calcine: crude salt 1 enters in level-one fluidized bed incinerator, temperature be 550 DEG C under conditions of carbonization or
2min is decomposed, most organic of decomposing or be carbonized obtains crude salt 2；
(3) second level is calcined: crude salt 2 is entered in two-stage rotary kiln calcining furnace and is calcined, and temperature is calcined under conditions of being 730 DEG C
22min obtains crude salt 3；
(4) crystal salt is prepared: dissolution: after crude salt 3 adds water to be completely dissolved；Divide salt: barium chloride solution is quantitatively added dropwise and forms sulphur
Sour precipitated barium；Filtering: clear liquid dispels impurity through nanometer scale ceramics membrane filter system and obtains salt water；Heavy metals removal: detection salt water
In heavy metal ion content select 12% sodium hydroxide solution to adjust the pH value of salt water to 7.5 as shown in table 4, it is quantitative plus
Enter the Na that mass fraction is 10%2S solution forms precipitating, by salt water by filtration system removing precipitating, removes removing heavy metals, obtains
To clear brine, clear brine enters multi-effect evaporation system, obtains crystal salt；
(5) crystal salt is dry: crystal salt enters back into fluid bed dryer evaporation after two-stage screw centrifuge gets rid of moisture removal
Moisture obtains Nacl.
Embodiment 5
A kind of chemical industry abraum salt refining methd is present embodiments provided, including the side for decomposing organic matter in chemical industry abraum salt
Method, abraum salt source Mr. Yu chemical plant company, it is as shown in table 5 below to be detected ingredient in its abraum salt:
Table 5
Note: " < (X) " indicates that test result is lower than detection limit (X), i.e., does not detect.
The method and abraum salt subtractive process for decomposing organic matter in chemical industry abraum salt are as follows:
(1) dry: abraum salt 100g to be put into flash dryer, dry 19s, removing under conditions of temperature is 215 DEG C
Moisture in abraum salt simultaneously decomposes part low molecule organic matter and obtains crude salt 1；
(2) level-one calcine: crude salt 1 enters in level-one fluidized bed incinerator, temperature be 450 DEG C under conditions of carbonization or
4min is decomposed, most organic of decomposing or be carbonized obtains crude salt 2；
(3) second level is calcined: crude salt 2 is entered in two-stage rotary kiln calcining furnace and is calcined, and temperature is calcined under conditions of being 650 DEG C
30min obtains crude salt 3；
(4) crystal salt is prepared: dissolution: after crude salt 3 adds water to be completely dissolved；Divide salt: barium chloride solution is quantitatively added dropwise and forms sulphur
Sour precipitated barium；Filtering: clear liquid dispels impurity through nanometer scale ceramics membrane filter system, obtains salt water；Heavy metals removal: detection salt water
In heavy metal ion content, as shown in table 5, select 20% sodium hydroxide solution adjust salt water pH value to 7, be quantitatively adding
The Na that mass fraction is 10%2S solution forms precipitating, by salt water by filtration system removing precipitating, removes removing heavy metals, obtains
Clear brine；Clear brine enters multi-effect evaporation system, obtains crystal salt；
(5) crystal salt is dry: crystal salt enters back into fluid bed dryer evaporation after two-stage screw centrifuge gets rid of moisture removal
Moisture obtains Nacl.
Embodiment 6
A kind of chemical industry abraum salt refining methd is present embodiments provided, including the side for decomposing organic matter in chemical industry abraum salt
Method, abraum salt source Mr. Yu chemical plant company, it is as shown in table 6 below to be detected ingredient in its abraum salt:
Table 6
The method and abraum salt subtractive process for decomposing organic matter in chemical industry abraum salt are as follows:
(1) dry: by abraum salt 100Kg under conditions of temperature is 195 DEG C dry 25s, remove the moisture in abraum salt and point
Solution part low molecule organic matter obtains crude salt 1；
(2) level-one is calcined: crude salt 1 is carbonized under conditions of temperature is 470 DEG C or decomposes 4min, and decompose or be carbonized big portion absolutely
Divide organic matter, obtains crude salt 2；
(3) second level is calcined: crude salt 2 calcines 20min under conditions of temperature is 690 DEG C, obtains crude salt 3；
(4) crystal salt is prepared: dissolution: after crude salt 3 adds water to be completely dissolved；Divide salt: quantitative chlorine adds barium chloride solution to form sulphur
Sour precipitated barium；Filtering: clear liquid dispels impurity after filtering, obtains salt water；Heavy metals removal: the heavy metal ion in detection salt water contains
Amount selects the pH value of 10% hydrochloric acid solution adjusting salt water to 7.2, being quantitatively adding mass fraction is 12% as shown in table 6
Na2S solution forms precipitating, and brine filter is removed and is precipitated, removing heavy metals is removed, obtains clear brine；Clear brine evaporation, obtains
To crystal salt；
(5) crystal salt is dry: crystal salt evaporation water obtains Nacl.
Experimental example 1
The obtained Nacl of embodiment 1-5 is detected, obtains that the results are shown in Table 8, Nacl physical and chemical standards are such as
Shown in table 7.By table 7 and table 8 it is found that chemical industry abraum salt refining methd provided by the invention can prepare standard compliant second level and level-one
Refining industrial salt.
Table 7
Table 8
Obviously, the above embodiments are merely examples for clarifying the description, and does not limit the embodiments.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of variation or
It changes.There is no necessity and possibility to exhaust all the enbodiments.And it is extended from this it is obvious variation or
It changes still within the protection scope of the invention.
Claims (7)
1. a kind of method for decomposing organic matter in chemical industry abraum salt, which comprises the steps of:
(1) dry: chemical industry abraum salt is dried and dehydrated, and obtains crude salt 1；
(2) level-one is calcined: the crude salt 1 is 450~550 DEG C in temperature, and progress level-one is forged under conditions of the time is 3~5min
It burns；Obtain crude salt 2；
(3) second level is calcined: the crude salt 2 is 650~750 DEG C in temperature, and progress second level is forged under conditions of the time is 15~30min
It burns, obtains crude salt 3.
2. the method according to claim 1 for decomposing organic matter in chemical industry abraum salt, which is characterized in that in the step (1)
Dry temperature is 180~230 DEG C, and the time is 15~30s.
3. the method according to claim 2 for decomposing organic matter in chemical industry abraum salt, which is characterized in that in the step (1)
Dry temperature is 195~215 DEG C, and the time is 18~25s.
4. the method according to claim 1 for decomposing organic matter in chemical industry abraum salt, which is characterized in that in the step (2)
The temperature of level-one calcining is 500~520 DEG C, and the time is 2~4min.
5. the method according to claim 1 for decomposing organic matter in chemical industry abraum salt, which is characterized in that in the step (3)
The temperature of second level calcining is 700~730 DEG C, and the time is 20~25min.
6. the method according to claim 1 for decomposing organic matter in chemical industry abraum salt, which is characterized in that the chemical industry abraum salt is pressed
Mass fraction meter, including sodium chloride 82%~96%, moisture 2.5%~7%, organic matter 0.11%~4%, sodium sulphate and other
Impurity 0.4%~3%.
7. the method according to claim 6 for decomposing organic matter in chemical industry abraum salt, which is characterized in that the chemical industry abraum salt is pressed
Mass fraction meter, sodium chloride 85%~92%, moisture 3~5%, organic matter 0.85%~3%, sodium sulphate and other impurities
0.5%~2%.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111468516A (en) * | 2020-04-27 | 2020-07-31 | 浙江红狮环保股份有限公司 | Medium-temperature pyrolysis resource utilization treatment process for medical waste salt |
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