CN108101089A - A kind of method that high-quality calcium carbonate albarium is prepared using paper white sludge - Google Patents
A kind of method that high-quality calcium carbonate albarium is prepared using paper white sludge Download PDFInfo
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- CN108101089A CN108101089A CN201711415968.0A CN201711415968A CN108101089A CN 108101089 A CN108101089 A CN 108101089A CN 201711415968 A CN201711415968 A CN 201711415968A CN 108101089 A CN108101089 A CN 108101089A
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- Prior art keywords
- paper white
- white sludge
- albarium
- calcium carbonate
- prepared
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Classifications
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/18—Carbonates
- C01F11/185—After-treatment, e.g. grinding, purification, conversion of crystal morphology
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/18—Carbonates
- C01F11/181—Preparation of calcium carbonate by carbonation of aqueous solutions and characterised by control of the carbonation conditions
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/60—Optical properties, e.g. expressed in CIELAB-values
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
- C01P2006/82—Compositional purity water content
Abstract
The invention discloses a kind of methods that high-quality calcium carbonate albarium is prepared using paper white sludge, comprise the following steps：(1) it is with slurry：Paper white sludge is added to the water, is stirred evenly, water addition is 0.5 5 times of paper white sludge；(2) clean：Auxiliary chemicals are added in into step (1) gains, heats up, is stirred to react；(3) separate：By step (2) gains plate compression or centrifugation；(4) cure：Quick lime is slowly added into filter cake obtained by step (3) to be cured；(5) it is dry：Filter cake after curing is obtained into whiting albarium through pneumatic conveying drying.Present invention process is easy to operate, equipment investment is small, chemical impurity easily removes, refined white clay quality is high, and most of physical and chemical index reaches light calcium carbonate powder quality standard, and low environmentally protective, safe and efficient of production cost.
Description
Technical field
It is specifically a kind of to be prepared using paper white sludge the present invention relates to a kind for the treatment of process of paper technology by-product white clay
The method of high-quality calcium carbonate albarium.
Background technology
Alkali recovery white slime is the secondary pollution solid waste that enterprises in pulp and paper industry alkali collection workshop generates, average often to produce
One ton paper meeting 0.8-1 tons of paper white sludges of output, main component are that the precipitation generated after causticizing reaction occurs for green liquor and lime
Calcium carbonate, in stronger alkalescence.According to incompletely statistics, the paper white sludge that China's paper industry is produced every year is up to 3,000,000 tons,
Only small part is utilized, and for significant portion all in outdoor stacking, it is huge to white clay landfill input to be on the one hand that enterprise needs
Human and material resources tissue place and transport etc., second is that also especially causing very strong secondary dirt to soil and water resource to environment
Dye.
Grass fiber slurrying is a big characteristic of China's papermaking, also complies with the fundamental realities of the country in China.It is returned in black liquor of pulp making alkali
In terms of accepting reason for medical treatment, since silicone content is higher in straw pulp white clay and the presence of soda salt, recycling can not be as wood pulp white clay also
Lime can be sintered into back to digestion direct reuse, means of flue gas desulfurization of power plant can not be sent to replace dicalcium powder.Minority is had ready conditions
Papermaking enterprise can be sent to cement plant of less demanding or brick field nearby sometimes to solve the outlet of fraction white clay, it is and big absolutely
Most enterprises treat white clay and outward transport are still taken to fill or directly discharge, continuous with slurrying alkali collection over time
Expand, resulting white clay secondary pollution will protrude increasingly, while waste substantial amounts of Calcium Carbonate resource.
Although the main component of paper white sludge is calcium carbonate, its still moisture containing 30-50% and a small amount of ferrous ion, two
The impurity such as silica, magnesium aluminium ion and free sodium hydroxide cause white clay to recycle cost than directly using new calcium oxide
Cost is high, causes current papermaking enterprise mostly using stockpiling and fills, larger pollution wind is caused to local groundwater resources
Danger.
At present, the recycling of paper white sludge and purification techniques are broadly divided into calcination and chemical washing impurity removal method, such as：In
State patent CN 103739176 A, CN 103754918 A, CN 102553890 A, CN 105481294 A, CN
102786732 A, CN 104803406 of 105214471A, CN refines the processing of white clay disclosed in A and 106146937 A of CN
In method, screening is respectively adopted, water washing, inorganic acid and organic acid neutralize or are passed through in carbon dioxide and etc. modes
Remove impurity and free alkali.There are technology path is long, sour neutralizing device corrosion is big, quality is difficult to control, titanium dioxide for the above method
Carbon source is limited, is refined of high cost, and the impurity such as remaining ferrous ion, silica and magnesium aluminium ion do not remove in white clay, production
Product whiteness refines being limited using field for white clay without raising, can not carry out downstream as the resource of high-quality calcium and use.
The content of the invention
It is an object of the invention to provide a kind of methods that high-quality calcium carbonate albarium is prepared using paper white sludge, utilize
Auxiliary chemicals and quick lime effectively remove metal impurities ion and the free moistures such as ferrous iron, magnesium, the aluminium in paper white sludge, Ran Hou
In drying process calcium carbonate is fully converted to the carbon dioxide reaction in purifying smoke, calcium hydroxide.This method technological operation
Simply, equipment investment is small, chemical impurity easily removes, refined white clay quality is high, and most of physical and chemical index reaches light calcium carbonate powder quality mark
Standard, and environmentally protective, the safe and efficient paper white sludge process for purification that production cost is low.
To achieve the above object, the present invention provides following technical solution：
A kind of method that high-quality calcium carbonate albarium is prepared using paper white sludge, is comprised the following steps：
(1) it is with slurry：Paper white sludge is added to the water, is stirred evenly, water addition is 0.5-5 times of paper white sludge；
(2) clean：Auxiliary chemicals are added in into step (1) gains, heats up, is stirred to react；
(3) separate：By step (2) gains plate compression or centrifugation；
(4) cure：Quick lime is slowly added into filter cake obtained by step (3) to be cured；
(5) it is dry：Filter cake after curing is obtained into whiting albarium through pneumatic conveying drying.
As further embodiment of the present invention：The addition of the auxiliary chemicals is the 0.1-10% of paper white sludge weight,
The auxiliary chemicals are 2- hydroxyethylidene diphosphonic acids guanidine-acetic acid, five sodium of diethylene triamine pentacetic acid (DTPA), citric acid, sodium gluconate, hydroxyl second
Pitch one kind in di 2 ethylhexyl phosphonic acid, sodium potassium tartrate tetrahydrate, 2- phosphonobutanes -1,2,4- tricarboxylic acids sodium salt and maleic acid-acrylic acid copolymer
Or a variety of mixture.
As further embodiment of the present invention：The additive amount of auxiliary chemicals is the 0.1- of paper white sludge weight in step (2)
10%.
As further embodiment of the present invention：Step is warming up to 60-100 DEG C in (2), is stirred to react the time as 0.5-2h.
As further embodiment of the present invention：In step (5) pneumatic conveying drying, drying temperature are carried out using purified flue gas
For 110-200 DEG C.
As further embodiment of the present invention：Filter cake is uniformly added into etc. the life of calcium content >=57% of quality by step (4)
Lime is stirred to react 0.5-1h in batch mixer.
Compared with prior art, the beneficial effects of the invention are as follows：
The present invention effectively removed using auxiliary chemicals and quick lime the metal impurities such as ferrous iron, magnesium, the aluminium in paper white sludge from
Son and free moisture, then in the drying process with the carbon dioxide reaction in purifying smoke, calcium hydroxide is fully converted to carbon
Sour calcium；This method technological operation is simple, equipment investment is small, chemical impurity easily removes, refined white clay quality is high, and most of physics and chemistry refers to
Mark reaches light calcium carbonate powder quality standard, and low environmentally protective, safe and efficient of production cost.
Description of the drawings
Fig. 1 is the flow chart for the method that high-quality calcium carbonate albarium is prepared using paper white sludge.
Specific embodiment
Referring to Fig. 1, the present invention provides a kind of method that high-quality calcium carbonate albarium is prepared using paper white sludge, including
Following steps：
(1) it is with slurry：Paper white sludge is added to the water, is stirred evenly, water addition is 0.5-5 times of paper white sludge；
(2) clean：Auxiliary chemicals are added in into step (1) gains, 60-100 DEG C is warming up to, is stirred to react 0.5-2h,
The addition of the auxiliary chemicals be paper white sludge weight 0.1-10%, the auxiliary chemicals for 2- hydroxyethylidene diphosphonic acids guanidine-acetic acid,
Five sodium of diethylene triamine pentacetic acid (DTPA), citric acid, sodium gluconate, 1-hydroxy ethylidene-1,1-diphosphonic acid, sodium potassium tartrate tetrahydrate, 2- phosphonobutanes-
One or more mixtures in 1,2,4- tricarboxylic acids sodium salt and maleic acid-acrylic acid copolymer；
(3) separate：By step (2) gains plate compression or centrifugation；
(4) cure：Quick lime is slowly added into filter cake obtained by step (3) to be cured；Filter cake such as is uniformly added at the quality
Calcium content >=57% quick lime, 0.5-1h is stirred to react in batch mixer；
(5) it is dry：The purified flue gas of filter cake after curing is obtained into the white stone of whiting in 110-200 DEG C of pneumatic conveying drying
Powder.
The technical solution of this patent is described in more detail With reference to embodiment.
The paper white sludge quality index is as follows：
Embodiment 1
The paper white sludge 1000Kg of above-mentioned quality index is taken, stirring in 500Kg water is added in and, to pulpous state, then adds in chemical industry and help
Agent 1Kg, the auxiliary chemicals use 2- hydroxyethylidene diphosphonic acid guanidine-acetic acids, are warming up to 60 DEG C and are stirred to react 0.5h, filter, and filter cake addition contains
0.5h is stirred to react in the batch mixer of 1000Kg quick limes, then carrying out pneumatic conveying drying by 110 DEG C of purifying smokes obtains refining carbon
Sour calcium albarium, quality physical and chemical index are as follows：
| Project | CaCO3 | MgCO3 | Fe | Acid non-soluble substance | pH | H2O | Whiteness |
| Content (%) | 98.21 | 0.17 | 0.08 | 0.18 | 9.8 | 1.00 | 85 |
Embodiment 2
Paper white sludge 1000Kg (quality index is with embodiment 1) is taken, stirring in 5000Kg water is added in and, to pulpous state, then adds in
Auxiliary chemicals 100Kg, auxiliary chemicals use the mixture of five sodium of 2- hydroxyethylidene diphosphonic acids guanidine-acetic acid and diethylene triamine pentacetic acid (DTPA), heating
2h is stirred to react to 100 DEG C, is filtered, filter cake adds in the batch mixer of the quick lime containing 1000Kg and is stirred to react 1h, then passes through 200
DEG C purifying smoke carries out pneumatic conveying drying and obtains whiting albarium, and quality physical and chemical index is as follows：
| Project | CaCO3 | MgCO3 | Fe | Acid non-soluble substance | pH | H2O | Whiteness |
| Content (%) | 97.92 | 0.18 | 0.10 | 0.20 | 10.5 | 0.90 | 85 |
Embodiment 3
Paper white sludge 1000Kg (quality index is with embodiment 1) is taken, stirring in 2000Kg water is added in and, to pulpous state, then adds in
Auxiliary chemicals 4Kg, the auxiliary chemicals are using the mixed of 2- hydroxyethylidene diphosphonic acids guanidine-acetic acid, five sodium of diethylene triamine pentacetic acid (DTPA) and citric acid
Object is closed, 70 DEG C is warming up to and is stirred to react 1h, is filtered, filter cake adds in the batch mixer of the quick lime containing 1000Kg and is stirred to react 0.7h,
Then carry out pneumatic conveying drying by 130 DEG C of purifying smokes and obtain whiting albarium, quality physical and chemical index is as follows：
| Project | CaCO3 | MgCO3 | Fe | Acid non-soluble substance | pH | H2O | Whiteness |
| Content (%) | 98.08 | 0.19 | 0.10 | 0.25 | 10.2 | 0.87 | 85 |
Embodiment 4
As different from Example 3, auxiliary chemicals 10Kg is added in, the auxiliary chemicals are using sodium gluconate, hydroxyl second
Pitch the mixture of di 2 ethylhexyl phosphonic acid, sodium potassium tartrate tetrahydrate and 2- phosphonobutane -1,2,4- tricarboxylic acids sodium salts.
Embodiment 5
As different from Example 3, auxiliary chemicals 20Kg is added in, the auxiliary chemicals are using sodium gluconate, hydroxyl second
Pitch the mixture of di 2 ethylhexyl phosphonic acid, sodium potassium tartrate tetrahydrate, 2- phosphonobutanes -1,2,4- tricarboxylic acids sodium salt and maleic acid-acrylic acid copolymer.
Embodiment 6
As different from Example 3, auxiliary chemicals 40Kg is added in, the auxiliary chemicals use diethylene triamine pentacetic acid (DTPA) five
Sodium, citric acid, sodium gluconate, 1-hydroxy ethylidene-1,1-diphosphonic acid, sodium potassium tartrate tetrahydrate and 2- phosphonobutane -1,2,4- tricarboxylic acids sodium salts
Mixture.
Embodiment 7
As different from Example 3, auxiliary chemicals 50Kg is added in, the auxiliary chemicals use diethylene triamine pentacetic acid (DTPA) five
Sodium, citric acid, sodium gluconate, 1-hydroxy ethylidene-1,1-diphosphonic acid, sodium potassium tartrate tetrahydrate, 2- phosphonobutanes -1,2,4- tricarboxylic acids sodium salt and
The mixture of maleic acid-acrylic acid copolymer.
Embodiment 8
As different from Example 3, add in auxiliary chemicals 80Kg, the auxiliary chemicals using 2- hydroxyethylidene diphosphonic acids guanidine-acetic acid,
Five sodium of diethylene triamine pentacetic acid (DTPA), citric acid, sodium gluconate, 1-hydroxy ethylidene-1,1-diphosphonic acid, sodium potassium tartrate tetrahydrate, 2- phosphonobutanes-
The mixture of 1,2,4- tricarboxylic acids sodium salt and maleic acid-acrylic acid copolymer.
The present invention operation principle be：The present invention effectively removes the Asia in paper white sludge using auxiliary chemicals and quick lime
The metal impurities such as iron, magnesium, aluminium ion and free moisture, then in the drying process with the carbon dioxide reaction in purifying smoke,
Calcium hydroxide is fully converted to calcium carbonate；This method technological operation is simple, equipment investment is small, chemical impurity easily removes, refined white
Mud quality is high, and most of physical and chemical index reaches light calcium carbonate powder quality standard, and low environmentally protective, safe and efficient of production cost.
The better embodiment of this patent is explained in detail above, but this patent is not limited to above-mentioned embodiment party
Formula, can also be on the premise of this patent objective not be departed from the knowledge that one skilled in the relevant art possesses
Various changes can be made.
Claims (6)
- A kind of 1. method that high-quality calcium carbonate albarium is prepared using paper white sludge, which is characterized in that comprise the following steps：(1) it is with slurry：Paper white sludge is added to the water, is stirred evenly, water addition is 0.5-5 times of paper white sludge；(2) clean：Auxiliary chemicals are added in into step (1) gains, heats up, is stirred to react；(3) separate：By step (2) gains plate compression or centrifugation；(4) cure：Quick lime is slowly added into filter cake obtained by step (3) to be cured；(5) it is dry：Filter cake after curing is obtained into whiting albarium through pneumatic conveying drying.
- 2. the method according to claim 1 that high-quality calcium carbonate albarium is prepared using paper white sludge, which is characterized in that The addition of the auxiliary chemicals be paper white sludge weight 0.1-10%, the auxiliary chemicals for 2- hydroxyethylidene diphosphonic acids guanidine-acetic acid, Five sodium of diethylene triamine pentacetic acid (DTPA), citric acid, sodium gluconate, 1-hydroxy ethylidene-1,1-diphosphonic acid, sodium potassium tartrate tetrahydrate, 2- phosphonobutanes- One or more mixtures in 1,2,4- tricarboxylic acids sodium salt and maleic acid-acrylic acid copolymer.
- 3. the method according to claim 1 that high-quality calcium carbonate albarium is prepared using paper white sludge, which is characterized in that The additive amount of auxiliary chemicals is the 0.1-10% of paper white sludge weight in step (2).
- 4. the method according to claim 1 that high-quality calcium carbonate albarium is prepared using paper white sludge, which is characterized in that Step is warming up to 60-100 DEG C in (2), is stirred to react the time as 0.5-2h.
- 5. the method according to claim 1 that high-quality calcium carbonate albarium is prepared using paper white sludge, which is characterized in that Pneumatic conveying drying is carried out using purified flue gas in step (5), drying temperature is 110-200 DEG C.
- 6. the method according to claim 1 that high-quality calcium carbonate albarium is prepared using paper white sludge, which is characterized in that Filter cake is uniformly added into etc. the quick lime of calcium content >=57% of quality by step (4), and 0.5-1h is stirred to react in batch mixer.
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| CN201711415968.0A CN108101089A (en) | 2017-12-25 | 2017-12-25 | A kind of method that high-quality calcium carbonate albarium is prepared using paper white sludge |
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| CN201711415968.0A CN108101089A (en) | 2017-12-25 | 2017-12-25 | A kind of method that high-quality calcium carbonate albarium is prepared using paper white sludge |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110106738A (en) * | 2019-05-17 | 2019-08-09 | 陕西科技大学 | A kind of preparation method of low AKD adsorption rate alkali recovery white slime whiting filler |
| CN116375072A (en) * | 2023-04-11 | 2023-07-04 | 重庆碳福森环保科技有限公司 | Method for producing modified calcium carbonate by aid method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101391794A (en) * | 2008-10-24 | 2009-03-25 | 魏湘 | Novel method for preparing light calcium carbonate by recovering solid white slime through alkaline pulping |
| CN101759220A (en) * | 2009-11-03 | 2010-06-30 | 武汉晨鸣汉阳纸业股份有限公司 | Method for self-production of calcium carbonate filler by white mud obtained by alkali recovery |
| CN102161495A (en) * | 2011-02-28 | 2011-08-24 | 广东工业大学 | Method for recycling soda waste mud from soda plant |
| CN102659161A (en) * | 2012-05-08 | 2012-09-12 | 山东轻工业学院 | Process for preparing white mud calcium carbonate from green liquor recovered from wood pulp sulfate-method pulping alkali |
| CN106925088A (en) * | 2015-12-29 | 2017-07-07 | 天津市英派克石化工程有限公司 | A kind of modified technique with white clay desulfurizing agent |
-
2017
- 2017-12-25 CN CN201711415968.0A patent/CN108101089A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101391794A (en) * | 2008-10-24 | 2009-03-25 | 魏湘 | Novel method for preparing light calcium carbonate by recovering solid white slime through alkaline pulping |
| CN101759220A (en) * | 2009-11-03 | 2010-06-30 | 武汉晨鸣汉阳纸业股份有限公司 | Method for self-production of calcium carbonate filler by white mud obtained by alkali recovery |
| CN102161495A (en) * | 2011-02-28 | 2011-08-24 | 广东工业大学 | Method for recycling soda waste mud from soda plant |
| CN102659161A (en) * | 2012-05-08 | 2012-09-12 | 山东轻工业学院 | Process for preparing white mud calcium carbonate from green liquor recovered from wood pulp sulfate-method pulping alkali |
| CN106925088A (en) * | 2015-12-29 | 2017-07-07 | 天津市英派克石化工程有限公司 | A kind of modified technique with white clay desulfurizing agent |
Non-Patent Citations (2)
| Title |
|---|
| 李仲明等: "利用碱回收白泥制备轻质碳酸钙", 《CHINA PULP &PAPER》 * |
| 郝翊翔等: "造纸白泥制备碳酸钙的方法研究", 《非金属矿》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110106738A (en) * | 2019-05-17 | 2019-08-09 | 陕西科技大学 | A kind of preparation method of low AKD adsorption rate alkali recovery white slime whiting filler |
| CN116375072A (en) * | 2023-04-11 | 2023-07-04 | 重庆碳福森环保科技有限公司 | Method for producing modified calcium carbonate by aid method |
| CN116375072B (en) * | 2023-04-11 | 2024-02-27 | 重庆碳福森环保科技有限公司 | Method for producing modified calcium carbonate by aid method |
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Application publication date: 20180601 |