CN109705880A - A kind of chlor-alkali salt sludge recycling technology - Google Patents
A kind of chlor-alkali salt sludge recycling technology Download PDFInfo
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- CN109705880A CN109705880A CN201910125753.8A CN201910125753A CN109705880A CN 109705880 A CN109705880 A CN 109705880A CN 201910125753 A CN201910125753 A CN 201910125753A CN 109705880 A CN109705880 A CN 109705880A
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Abstract
The invention discloses a kind of chlor-alkali salt sludges to recycle technology, belongs to environment protection field.The chlor-alkali salt sludge recoverying and utilizing method first passes through filtering, dry, calcining is again after concentrated base and polyvinyl alcohol hydrothermal modification, air-flow crushing, with citric acid, sodium peroxydisulfate, amylose, after waste plant fiber is sufficiently mixed uniformly, can be obtained improves association of soil object.The association of soil object prepared by the present invention that improves can sufficiently improve the soil by hydro carbons and heavy metal pollution using discarded chlor-alkali salt sludge as main material.
Description
Technical field
The invention belongs to environment protection fields, and in particular to a kind of chlor-alkali salt sludge recycling technology.
Background technique
Chlorine industry salt slurry is generated pulpous state emission during caustic soda, soda manufacture salt refining, salt water warp
Resulting clarified brine is known as refined brine after refining spearation, and the emission of precipitating is known as salt slurry.It is main in generated salt slurry
Contain barium sulfate, calcium carbonate, magnesium hydroxide, soluble-salt and other insoluble matters.Soda industry production at present needs industry food every year
The salt slurry of 15,000,000 tons of salt (calculating by sodium chloride 100%), two alkali production discharge national in this way amounts up to hundreds of thousands ton.
As society and enterprise are to environmentally friendly pay attention to day by day, especially after China proposes the strategy of sustainable development, to salt slurry
Integrated treatment be urgent project that domestic soda industry faces, the discharge of a large amount of salt slurries can cause serious pollution to environment,
If being discharged into river, harbour and river can be silted up.It needs to occupy a large amount of place if stacking, after rain drop erosion, easily cause to ring
The secondary pollution in border.
Summary of the invention
The object of the present invention is to provide a kind of chlor-alkali salt sludges to recycle technology, by carrying out active processing to salt slurry
And modification, and after being compounded with other modifying agents, it can effectively improve soil environment, adsorb heavy metal ion and petroleum etc.
Hydrocarbons pollutant, and improve acid soil property.
In order to solve the above technical problems, the invention adopts the following technical scheme:
A kind of chlor-alkali salt sludge recoverying and utilizing method, which comprises the following steps: (1) waste residue salt slurry is prepared first
At slurry, through magnetic separation, strainer filtering, drying；(2) salt slurry dried first is calcined through rotary furnace, is ground to 300-400 mesh, then plus
Enter the slurry that water is configured to 1: 3-1: 4；(3) 30% sodium hydroxide solution in salt material-mud autoclave, will be added, then plus
Enter polyvinyl alcohol with low degree of polymerization, be warming up to 200 DEG C, enclosed system reacts 2 hours, and the additional amount of the sodium hydroxide is salt mud
0.2-0.4 times of quality of material, the additional amount of the polyvinyl alcohol with low degree of polymerization are 0.1-0.2 times of quality of salt material-mud；(4) will
Above-mentioned solution filtering, washing obtain ultra-fine salt slurry through air-flow crushing；(5) by salt slurry ultra-fine in (4), with citric acid, over cure
Sour sodium, amylose, after waste plant fiber is sufficiently mixed uniformly, can be obtained improves association of soil object.
Further, slurry is formulated as that the water of 5-10 times of quality is added in waste residue salt slurry in step (1), in 80-100
Turn/beater of min is beaten 2 hours.
Further, the strainer of strainer filtering is 300-400 mesh in step (1).
Further, revolution furnace temperature is 800 DEG C -900 DEG C in step (2), and calcination time is 40-60 minutes.
Further, the molecular weight of the polyvinyl alcohol with low degree of polymerization is 2-3 ten thousand.
Further, mass parts, 10-12 parts of ultra-fine salt slurry, 1-2 parts of citric acid, sodium peroxydisulfate are pressed in the step (5)
1-2 parts, 1-2 parts of amylose, 4-6 parts of waste plant fiber are sufficiently mixed.
Further, the waste plant fiber using husk, stalk, waste bacterium rod, peanut shell cellulosic plant waste material
It is obtained after crushing.
Further, the application method for improving association of soil object are as follows: by improvement association of soil object and soil volume ratio
After 0.1: 1 amount is sufficiently mixed, 80-100 DEG C of hot water is eluted, after 10-15 minutes.
The invention has the following advantages:
By the present invention in that concentrated base and polyvinyl alcohol with low degree of polymerization is added, at high temperature with after pre-processing to salt slurry
Closed hydro-thermal reaction is carried out, the porosity and fluffy degree of the salt slurry that can effectively improve, and the surface of salt slurry is modified,
Group content is improved, to improve the degree of absorption to heavy metal ions in soil and hydrocarbons, while low polymerization degree is added
Polyvinyl alcohol, on the one hand can further improve pattern and the gap of salt slurry, while can be adsorbed onto the surface of salt slurry, in cooling
Afterwards, one layer of organogel layer film is formed, can be in soil modification, quick adsorption oily matter and heavy metal complex, and
And quickly desorption being acted in hot water, and take away, salt slurry increases adsorption activity and the rate of adsorption, so that the two can cooperate with promotion
Absorption.Simultaneously in water-heat process, it can effectively improve granularity by the way that polyvinyl alcohol with low degree of polymerization is added, be formed more uniform
Ultra-fine salt slurry.
The present invention passes through ultra-fine salt slurry and citric acid, sodium peroxydisulfate, amylose, waste plant fiber compounding, as soil
Earth improver can realize optimal adsorption efficiency and improve efficiency.Amylose peptide bond rich in, after the heating,
It can quickly dissolve, so that the gel structure of rapid damage polyvinyl alcohol with low degree of polymerization, increases mobility, promote elution efficiency,
It has certain absorption agglomerating effect to grease with reunion adsorption effect simultaneously.Sodium peroxydisulfate as initiator and oxidant,
Hydroxyl radical free radical ion is improved, citric acid improves complexing effect, and waste plant fiber is led to as soil dispersing agent and backing material
Compounding for above-mentioned a few persons and ultra-fine salt slurry is crossed, the optimal adsorption efficiency of cooperative achievement and efficiency can be improved.
Specific embodiment
To facilitate a better understanding of the present invention, it is illustrated by the following examples, these examples belong to protection of the invention
Range, but do not limit the scope of the invention.
Embodiment 1
A kind of chlor-alkali salt sludge recoverying and utilizing method, comprising the following steps: (1) 5-10 times of quality is added in waste residue salt slurry
Water is beaten 2 hours in the beater of 80-100 turns/min and is configured to slurry, filters through magnetic separation, 300-400 mesh filter screen, drying；
(2) salt slurry dried first is calcined through rotary furnace, and revolution furnace temperature is 850 DEG C, and calcination time is 50 minutes, is ground to 300-400
Mesh adds the slurry that water is configured to 1: 4；(3) by salt material-mud autoclave, 30% sodium hydroxide solution is added,
Polyvinyl alcohol with low degree of polymerization is added, the molecular weight of the polyvinyl alcohol with low degree of polymerization is 2-3 ten thousand, is warming up to 200 DEG C, obturator
System's reaction 2 hours, the additional amount of the sodium hydroxide are 0.3 times of quality of salt material-mud, the polyvinyl alcohol with low degree of polymerization
Additional amount is 0.15 times of quality of salt material-mud；(4) above-mentioned solution is filtered, washs, obtains ultra-fine salt slurry through air-flow crushing；
(5) by 11 parts of salt slurry ultra-fine in (4), 1.5 parts of citric acid, 1.5 parts of sodium peroxydisulfate, 1.5 parts of amylose, waste plant fiber
After 5 parts are sufficiently mixed uniformly, can be obtained improves association of soil object.
The waste plant fiber using husk, stalk, waste bacterium rod, peanut shell cellulosic plant waste material through crushing after
It obtains.The application method for improving association of soil object are as follows: abundant by the amount for improving association of soil object and soil volume ratio 0.1: 1
After mixing, 80-100 DEG C of hot water is eluted, after 10-15 minutes.
Comparative example 1
It is essentially identical with the preparation process of embodiment 1, it has only the difference is that lacking step in chlor-alkali salt sludge recoverying and utilizing method
Rapid one rotary furnace calcining.
Comparative example 2
It is essentially identical with the preparation process of embodiment 1, it has only the difference is that being added without in chlor-alkali salt sludge recoverying and utilizing method
Polyvinyl alcohol with low degree of polymerization.
Comparative example 3
It is essentially identical with the preparation process of embodiment 1, have only unlike oligomerization in chlor-alkali salt sludge recoverying and utilizing method
The additional amount for spending polyvinyl alcohol is 0.4 times of quality of salt material-mud.
Comparative example 4
It is essentially identical with the preparation process of embodiment 1, it has only the difference is that being added without in chlor-alkali salt sludge recoverying and utilizing method
Sodium hydroxide.
Comparative example 5
It is essentially identical with the preparation process of embodiment 1, it has only the difference is that being added without in chlor-alkali salt sludge recoverying and utilizing method
Citric acid, sodium peroxydisulfate, amylose.
Comparative example 6
It is essentially identical with the preparation process of embodiment 1, it has only the difference is that being added without in chlor-alkali salt sludge recoverying and utilizing method
Citric acid.
Comparative example 7
It is essentially identical with the preparation process of embodiment 1, it has only the difference is that being added without in chlor-alkali salt sludge recoverying and utilizing method
Sodium peroxydisulfate.
Comparative example 8
It is essentially identical with the preparation process of embodiment 1, it has only the difference is that being added without in chlor-alkali salt sludge recoverying and utilizing method
Amylose.
Effect assessment, the method for effect assessment are carried out to product made from embodiment 1 and comparative example 1-8 are as follows: selection soil
It is the contaminated soil of 15000mg/kg and 200PPm heavy metal Hg pollution for crude oil pollution concentration TPH.
| Experimental project | TPH removal rate % | Hg removal rate % |
| Embodiment 1 | 83 | 93 |
| Embodiment 2 | 81 | 92 |
| Embodiment 3 | 82 | 91 |
| Comparative example 1 | 74 | 85 |
| Comparative example 2 | 70 | 81 |
| Comparative example 3 | 81 | 90 |
| Comparative example 4 | 52 | 61 |
| Comparative example 5 | 59 | 68 |
| Comparative example 6 | 72 | 83 |
| Comparative example 7 | 71 | 82 |
| Comparative example 8 | 73 | 84 |
By the present invention in that concentrated base and polyvinyl alcohol with low degree of polymerization is added, at high temperature with after pre-processing to salt slurry
Closed hydro-thermal reaction is carried out, the porosity and fluffy degree of the salt slurry that can effectively improve, and the surface of salt slurry is modified,
Group content is improved, to improve the degree of absorption to heavy metal ions in soil and hydrocarbons, while low polymerization degree is added
Polyvinyl alcohol, on the one hand can further improve pattern and the gap of salt slurry, while can be adsorbed onto the surface of salt slurry, in cooling
Afterwards, one layer of organogel layer film is formed, can be in soil modification, quick adsorption oily matter and heavy metal complex, and
And quickly desorption being acted in hot water, and take away, salt slurry increases adsorption activity and the rate of adsorption, so that the two can cooperate with promotion
Absorption.Simultaneously in water-heat process, it can effectively improve granularity by the way that polyvinyl alcohol with low degree of polymerization is added, be formed more uniform
Ultra-fine salt slurry.
The present invention passes through ultra-fine salt slurry and citric acid, sodium peroxydisulfate, amylose, waste plant fiber compounding, as soil
Earth improver can realize optimal adsorption efficiency and improve efficiency.Amylose peptide bond rich in, after the heating,
It can quickly dissolve, so that the gel structure of rapid damage polyvinyl alcohol with low degree of polymerization, increases mobility, promote elution efficiency,
It has certain absorption agglomerating effect to grease with reunion adsorption effect simultaneously.Sodium peroxydisulfate as initiator and oxidant,
Hydroxyl radical free radical ion is improved, citric acid improves complexing effect, and waste plant fiber is led to as soil dispersing agent and backing material
Compounding for above-mentioned a few persons and ultra-fine salt slurry is crossed, the optimal adsorption efficiency of cooperative achievement and efficiency can be improved.
The above content is it cannot be assumed that present invention specific implementation is only limited to these instructions, for the technical field of the invention
Those of ordinary skill for, under the premise of not departing from present inventive concept, a number of simple deductions or replacements can also be made, all answers
When being considered as belonging to present invention scope of patent protection determined by the appended claims.
Claims (8)
1. a kind of chlor-alkali salt sludge recycles process, which comprises the following steps:
(1) waste residue salt slurry is configured to slurry first, through magnetic separation, strainer filtering, drying；
(2) salt slurry dried first is calcined through rotary furnace, is ground to 300-400 mesh, is added the slurry that water is configured to 1: 3-1: 4；
(3) by salt material-mud autoclave, 30% sodium hydroxide solution is added, adds polyvinyl alcohol with low degree of polymerization,
200 DEG C are warming up to, enclosed system reacts 2 hours, and the additional amount of the sodium hydroxide is 0.2-0.4 times of quality of salt material-mud,
The additional amount of the polyvinyl alcohol with low degree of polymerization is 0.1-0.2 times of quality of salt material-mud；
(4) above-mentioned solution is filtered, washs, obtains ultra-fine salt slurry through air-flow crushing；
(5) by salt slurry ultra-fine in step (4), with citric acid, sodium peroxydisulfate, amylose, waste plant fiber is sufficiently mixed
After uniformly, can be obtained improves association of soil object.
2. chlor-alkali salt sludge recoverying and utilizing method according to claim 1, which is characterized in that the preparation of slurry in step (1)
For the water that 5-10 times of quality is added in waste residue salt slurry, it is beaten 2 hours in the beater of 80-100 turns/min.
3. chlor-alkali salt sludge recoverying and utilizing method according to claim 1, which is characterized in that strainer filtering in step (1)
Strainer is 300-400 mesh.
4. chlor-alkali salt sludge recoverying and utilizing method according to claim 1, which is characterized in that turn round furnace temperature in step (2)
It is 800 DEG C -900 DEG C, calcination time is 40-60 minutes.
5. chlor-alkali salt sludge recoverying and utilizing method according to claim 1, which is characterized in that the polyvinyl alcohol with low degree of polymerization
Molecular weight be 2-3 ten thousand.
6. chlor-alkali salt sludge recoverying and utilizing method according to claim 1, which is characterized in that press quality in the step (5)
Part, 10-12 parts of ultra-fine salt slurry, 1-2 parts of citric acid, 1-2 parts of sodium peroxydisulfate, 1-2 parts of amylose, waste plant fiber 4-6
Part is sufficiently mixed.
7. chlor-alkali salt sludge recoverying and utilizing method according to claim 1, which is characterized in that the waste plant fiber uses
Husk, stalk, waste bacterium rod, peanut shell cellulosic plant waste material through crushing after obtain.
8. chlor-alkali salt sludge recoverying and utilizing method according to claim 1, which is characterized in that the improvement association of soil object
Application method are as follows: after being sufficiently mixed by the amount for improving association of soil object and soil volume ratio 0.1: 1,80-100 DEG C of hot water is eluted,
After 10-15 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910125753.8A CN109705880A (en) | 2019-02-20 | 2019-02-20 | A kind of chlor-alkali salt sludge recycling technology |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910125753.8A CN109705880A (en) | 2019-02-20 | 2019-02-20 | A kind of chlor-alkali salt sludge recycling technology |
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| CN109705880A true CN109705880A (en) | 2019-05-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111204780A (en) * | 2020-01-09 | 2020-05-29 | 西安交通大学 | Resource utilization process of salt mud in chlor-alkali industry |
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|---|---|---|---|---|
| JPH10180300A (en) * | 1996-12-25 | 1998-07-07 | Kurita Water Ind Ltd | Treatment of heavy metal-containing sludge or mud |
| CN1554588A (en) * | 2003-12-25 | 2004-12-15 | 华东理工大学 | Process for producing super fine barium sulfate and calcium carbonate using chloralkali salt mud |
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| CN102040250A (en) * | 2010-11-17 | 2011-05-04 | 辽宁工程技术大学 | Method for comprehensively utilizing chlor-alkali salt sludge |
| CN105923646A (en) * | 2016-05-05 | 2016-09-07 | 中盐金坛盐化有限责任公司 | Resource comprehensive utilization for salty mud |
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2019
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|---|---|---|---|---|
| JPH10180300A (en) * | 1996-12-25 | 1998-07-07 | Kurita Water Ind Ltd | Treatment of heavy metal-containing sludge or mud |
| CN1554588A (en) * | 2003-12-25 | 2004-12-15 | 华东理工大学 | Process for producing super fine barium sulfate and calcium carbonate using chloralkali salt mud |
| CN101429079A (en) * | 2008-12-04 | 2009-05-13 | 南宁市化工研究设计院 | Production of alkalescent fertilizer with abandoned salty mud of alkali-chloride factory and producing method thereof |
| CN102040250A (en) * | 2010-11-17 | 2011-05-04 | 辽宁工程技术大学 | Method for comprehensively utilizing chlor-alkali salt sludge |
| CN106316480A (en) * | 2016-03-12 | 2017-01-11 | 福建洋屿环保科技股份有限公司 | Method for preparing soil organic fertilizer by mixing salty mud and sludge |
| CN105923646A (en) * | 2016-05-05 | 2016-09-07 | 中盐金坛盐化有限责任公司 | Resource comprehensive utilization for salty mud |
Non-Patent Citations (3)
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| 中国环境保护产业协会: "《国家重点环境保护实用技术及示范工程汇编 2014版》", 31 December 2015, 中国环境出版社 * |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111204780A (en) * | 2020-01-09 | 2020-05-29 | 西安交通大学 | Resource utilization process of salt mud in chlor-alkali industry |
| CN111204780B (en) * | 2020-01-09 | 2021-04-27 | 西安交通大学 | Resource utilization process of salt mud in chlor-alkali industry |
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