CN101066825A - Capping material for treating eutrophic lake and its prepn process - Google Patents
Capping material for treating eutrophic lake and its prepn process Download PDFInfo
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- CN101066825A CN101066825A CN 200710038761 CN200710038761A CN101066825A CN 101066825 A CN101066825 A CN 101066825A CN 200710038761 CN200710038761 CN 200710038761 CN 200710038761 A CN200710038761 A CN 200710038761A CN 101066825 A CN101066825 A CN 101066825A
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Abstract
The present invention is capping material for eliminating soluble phosphate and other trophic salts from eutrophic lake and its preparation process, and belongs to the field of environment protecting technology. The granular capping material is prepared with natural carbonate or calcium industry side product 65-70 %, RE tailing with Ce salt, La salt or RE oxide 10-15 % and inorganic cementing material cement, lime, gypsum or organic polymer adhesive 15-25 %, and through mixing at 20 deg.c, washing, filtering and drying. The capping material can absorb most of soluble phosphate and other trophic salts from water to form insoluble compound depositing to the surface of bottom mud, and the formed blocking adsorption layer can avoid release of phosphate from bottom mud to water body.
Description
Technical field
The present invention relates to a kind of cap closure material that is used for the on-the-spot disposal lake eutrophication and preparation method thereof.More particularly, be cap closure material of removing by the nutritive salt such as soluble phosphate in the eutrophic lake and preparation method thereof.Belong to the environment protection processing technology field.
Background technology
The principal character of China's lake pollution is a body eutrophication, lake, city especially, because the interference of human activity, the eutrophication process is very rapid.The basic reason that causes body eutrophication is that the nutritive salt such as soluble phosphate in the water body exceed standard, and has surpassed the self-purification capacity in lake.Lake sediment (being called bed mud again) is the important storehouse of accumulating of nutritive salt such as lake soluble phosphate, after nutritive salt such as the soluble phosphate load of going into the lake reduces or cuts dirt fully, nutritive salt such as the soluble phosphate in the bed mud can progressively discharge, and become the endogenous dominant factor of lake eutrophication.
Doing a lot of explorations aspect the elimination endogenous pollution abroad: in the lake, add the inerting that chemical agent quickens phosphorus, thereby reduce the release rate of endogenous phosphorus.The chemical agent that uses comprises: aluminium salt, alum, calcium oxide etc.The weak point of known chemical medicament is that adsorptive capacity is all on the low side, only can partly remove the nutritive salt such as soluble phosphate in the water body, and therefore, the cap closure material that synthetic is developed high performance removal eutrophy salt more and more comes into one's own.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art part, a large amount of nutritive salt such as soluble phosphate in a kind of existing removal water body are provided, can intercept the cap closure material that nutritive salt such as soluble phosphate in the bed mud discharges again.
A kind of cap closure material that is used for the on-the-spot disposal lake eutrophication of the present invention is characterized in that the composition of this cap closure material and weight percent content thereof are as follows:
1. natural carbonate rock or calcium industrial by-products are 65～70%;
2. rare-earth tailing cerium salt or lanthanum salt or its rare earth oxide are 10～15%;
3. inorganic coagulation material cement, lime or gypsum, or the organic polymer binding agent is 15～25%.
Above-mentioned a kind of preparation method who handles the cap closure material of lake eutrophication, it is characterized in that having following process and step: take by weighing raw material by the afore mentioned rules composition of raw materials, i.e. 1. natural carbonate rock or calcium industrial by-products, 2. rare-earth tailing cerium or lanthanum salt or its rare earth oxide, 3. inorganic coagulation material cement, lime or gypsum, or organic polymer binding agent; Earlier 2. raw material is prepared into the certain density aqueous solution, adds alkaline matter subsequently and regulate pH value to 7～11, form basic solution; Add above-mentioned raw materials levigate powder 1. then, constant temperature stirred 30～60 minutes under 20 ℃ of temperature, generated a kind of throw out through reacting after, with this throw out through deionized water wash, filtration, drying then; Dry back adds 3. gelling material of raw material, and carries out uniform mixing, finally makes the cap closure material.
In the raw material of above-mentioned employing, described raw material 1. natural carbonate is calcite, rhombspar, limestone or clock mammary cancer; 2. rare earth oxide is optimum is Lanthanum trichloride for described raw material; 3. gelling material is optimum is cement for described raw material.
The mechanism of action of cap closure material of the present invention is as described below:
Carbonate rock or calcic industrial by-products that raw material is natural have physical and chemical adsorption and co-precipitation to nutritive salt such as lake soluble phosphates, form the calcium phosphorous compound of indissoluble on its surface by the minimizing of heterogeneous nucleation energy; Cerium salt, lanthanum salt or rare earth oxide have the specific adsorption effect to nutritive salt such as soluble phosphates.Cerium salt after the dissolving, lanthanum salt or its rare earth oxide, the surface hydroxyl in that its surface exists by the ion exchange of nutritive salt such as surface hydroxyl and soluble phosphate, forms the inner complex of a large amount of indissolubles.Can strengthen its specific adsorption effect with natural carbonate rock or calcic industrial by-products cerium-carrying salt, lanthanum salt or its rare earth oxide to nutritive salt such as soluble phosphates.In cap closure material settling process, inorganic coagulation material or high polymer binder can guarantee that the cap closure material does not scatter before arriving the bed mud surface, make wherein chemical stabilizer play effectiveness and not be subjected to ectocine, simultaneously phosphoric are also had efficient adsorptivity.
The advantage and the characteristics of cap closure material of the present invention are as follows:
(1) among the present invention used raw material natural carbonate rock or calcic industrial by-products except self having the effect of absorption phosphoric, simultaneously also be carrier function, and rare-earth salts is a critical material of removing and suppress the phosphoric migration as cerium salt, lanthanum salt or its rare earth oxide.
(2) solved the structure unicity of cap closure material, effectiveness unicity problem in the past, and the excessive problem of bringing thus of cap closure material consumption.
(3) cap closure material of the present invention is not only efficiently removed the solvable phosphorus in the water body, and can effectively suppress the release of phosphorus in the bed mud for a long time.
(4) use of cap closure material of the present invention does not influence and does not destroy aquatic ecosystem, and it is current not influence lake physical geography condition, the depth of water and ship.
Embodiment
After now specific embodiments of the invention being described in.
Embodiment 1
Cap closure material preparation process and step in the present embodiment are as described below:
1. raw material adopts calcite (Shanghai Unilever product), and it is crushed to the pellet that particle diameter is crossed 200 mesh sieves, and its weight percent proportioning is 78%;
2. raw material adopts Lanthanum trichloride (Shanghai Yuelong Chemical Plant's product), and its weight percent proportioning is 10%;
3. raw material adopts cement as the protection jointing compound, and its weight percent proportioning is 12%.Get above-mentioned Lanthanum trichloride and be prepared into the aqueous solution that concentration is 1mol/L, add the NH that concentration is 2mol/L subsequently
4Cl solution is regulated pH value to 9.0, and then is added above-mentioned calcite powder, stirred 30 minutes at 20 ℃ of following constant temperature, a kind of throw out of generation through reacting after, with this throw out through deionized water wash, filtration, drying then; Dry back adds consolidating material cement, and carries out uniform mixing, finally makes the cap closure material.
The prepared cap closure material of the foregoing description is done adsorption test:
At 25 ℃, initial pH value is 6 soluble phosphoric acid salts solution, and its initial phosphorus concentration is under the condition of 50mg/L, carries out adsorption test.When the phosphorus concentration when absorption reaches balance was 14mg/L, recording cap closure material balance phosphorus adsorptive capacity was 48.89mgP/g cap closure material (being average every gram cap closure material absorption 48.89mgP).As the reference comparative group, 200 purpose clinoptilolites are under similarity condition, and its adsorptive capacity is 4.34mgP/g zeolite (being average every gram zeolite adsorption 4.34mgP).The former phosphorus adsorptive capacity is more than 10 times of the latter.
The cap closure material can be added to the water body that needs processing with particle cap closure material by year instrument far away or dedicated transport pipeline, and be deposited to the surface of bed mud when actual treatment is operated.
Claims (3)
1. cap closure material that is used for the on-the-spot disposal lake eutrophication is characterized in that the composition of this cap closure material and weight percent content thereof are as follows:
1. natural carbonate rock or calcium industrial by-products are 65～70%;
2. rare-earth tailing cerium salt or lanthanum salt or its rare earth oxide are 10～15%;
3. inorganic coagulation material cement, lime or gypsum, or the organic polymer binding agent is 15～25%.
2. the described a kind of preparation method who handles the cap closure material of lake eutrophication of claim 1, it is characterized in that having following process and step: take by weighing raw material by the afore mentioned rules composition of raw materials, i.e. 1. natural carbonate rock or calcium industrial by-products, 2. rare-earth tailing cerium or lanthanum salt or its rare earth oxide, 3. inorganic coagulation material cement, lime or gypsum, or organic polymer binding agent; Earlier 2. raw material is prepared into the certain density aqueous solution, adds alkaline matter subsequently and regulate pH value to 7～11, form basic solution; Add above-mentioned raw materials levigate powder 1. then, stirred 30～60 minutes, through reacting after, generate a kind of throw out at 20 ℃ of following constant temperature, with this throw out through deionized water wash, filtration, drying then; Dry back adds 3. gelling material of raw material, and carries out uniform mixing, finally makes the cap closure material.
3. a kind of preparation method who handles the cap closure material of lake eutrophication as claimed in claim 2, it is characterized in that described raw material 1. natural carbonate be calcite, rhombspar, limestone or clock mammary cancer; 2. rare earth oxide is optimum is Lanthanum trichloride for described raw material; 3. gelling material is optimum is cement for described raw material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100387616A CN100534607C (en) | 2007-03-29 | 2007-03-29 | Capping material for treating eutrophic lake and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100387616A CN100534607C (en) | 2007-03-29 | 2007-03-29 | Capping material for treating eutrophic lake and preparation method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN101066825A true CN101066825A (en) | 2007-11-07 |
| CN100534607C CN100534607C (en) | 2009-09-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2007100387616A Expired - Fee Related CN100534607C (en) | 2007-03-29 | 2007-03-29 | Capping material for treating eutrophic lake and preparation method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102775035A (en) * | 2012-08-06 | 2012-11-14 | 山东建筑大学 | River/lake heavy metal pollution sediment in-situ coverage method and device |
| CN102866238A (en) * | 2012-09-17 | 2013-01-09 | 河海大学 | Apparatus for researching bottom mud suspending mechanism and release of nutritive salt and operation method of apparatus |
| CN106186247A (en) * | 2015-04-29 | 2016-12-07 | 郑伟 | A kind of water body control phosphorus preparation and application thereof |
| CN115124205A (en) * | 2022-06-23 | 2022-09-30 | 中交第二航务工程局有限公司 | Polluted bottom mud repairing covering agent prepared from building waste mud and using method |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102267788B (en) * | 2011-05-05 | 2012-10-31 | 中国科学院广州地球化学研究所 | Nitrate slow-release material and preparation method thereof |
-
2007
- 2007-03-29 CN CNB2007100387616A patent/CN100534607C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102775035A (en) * | 2012-08-06 | 2012-11-14 | 山东建筑大学 | River/lake heavy metal pollution sediment in-situ coverage method and device |
| CN102775035B (en) * | 2012-08-06 | 2013-09-18 | 山东建筑大学 | River/lake heavy metal pollution sediment in-situ coverage method and device |
| CN102866238A (en) * | 2012-09-17 | 2013-01-09 | 河海大学 | Apparatus for researching bottom mud suspending mechanism and release of nutritive salt and operation method of apparatus |
| CN102866238B (en) * | 2012-09-17 | 2015-08-26 | 河海大学 | A kind of bed mud of studying works the device and method of operating thereof that hang machine-processed and Nutrient release |
| CN106186247A (en) * | 2015-04-29 | 2016-12-07 | 郑伟 | A kind of water body control phosphorus preparation and application thereof |
| CN115124205A (en) * | 2022-06-23 | 2022-09-30 | 中交第二航务工程局有限公司 | Polluted bottom mud repairing covering agent prepared from building waste mud and using method |
| CN115124205B (en) * | 2022-06-23 | 2023-06-20 | 中交第二航务工程局有限公司 | Repairing covering agent for polluted bottom mud prepared from building waste mud and use method thereof |
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| Publication number | Publication date |
|---|---|
| CN100534607C (en) | 2009-09-02 |
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Granted publication date: 20090902 Termination date: 20120329 |