CN103408157A - Process and equipment for recycling filter pressing waste water in production of nano activated calcium carbonate - Google Patents
Process and equipment for recycling filter pressing waste water in production of nano activated calcium carbonate Download PDFInfo
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- CN103408157A CN103408157A CN201310174538XA CN201310174538A CN103408157A CN 103408157 A CN103408157 A CN 103408157A CN 201310174538X A CN201310174538X A CN 201310174538XA CN 201310174538 A CN201310174538 A CN 201310174538A CN 103408157 A CN103408157 A CN 103408157A
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Abstract
The invention discloses a process and equipment for recycling filter pressing waste water in production of nano activated calcium carbonate. The process and the equipment provided by the invention are capable of completely purifying filter pressing waste water in production of nano activated calcium carbonate so that the filter pressing waste water can be up to the standard of water used for the production of nano activated calcium carbonate; and therefore, recycling is realized. The process provided by the invention comprises the following steps of: slowly adding an organic flocculant to a burdening tank with clear water and stirring quickly to obtain an emulsion solution; diluting the obtained emulsion solution by using water until the concentration of the solution is 0.1-0.5%; activating carbonate sinter in an activation tank in the activation process of nano activated calcium carbonate, then introducing the diluted solution into the activation tank and then continuously and quickly stirring for 10-15 min; carrying out diaphragm filter pressing on the slurry which is quickly stirred for 10-15min; discharging filtrate into a production settling basin; adding an inorganic regulator to regulate the pH to 7-9; cyclically using the overflowing clear water in the production of nano activated calcium carbonate; and simultaneously, generating a little precipitate.
Description
Technical field
The present invention relates to the industrial production preparation of the nm-class active calcium carbonate in inorganic powder preparation field.
Background technology
Current most of nano-calcium carbonate and Production of Light Calcium Carbonate enterprise all adopt underground water, and the waste water of discharge is almost all absorbed by earth's surface, and directly polluted underground water, form vicious cycle; And existing production still exists amount of makeup water large (particularly digesting water), the problem such as cyclic utilization rate is low, produce adverse influence to production run and the production cost of enterprise.60 nanometers and light calcium carbonate enterprises average water loss of calcium carbonate ton product in 2007 is more than 10 tons according to statistics, in recent years, the waste water reclamation that is positioned at domestic advanced level of the same trade utilizes technology also only to make the water loss of ton nanometer and light calcium carbonate product be down to half (5 tons) left and right.
The reason that press filtration waste water in nano-calcium carbonate production can not directly apply to production process again mainly contains two aspects: the one, and the limitation of filtering equipment or other shrink equipment itself can not be held back nano level super fine calcium carbonate particle fully, and the filtrate that consequently is mixed with ultra-fine particles can not directly apply to front end production; The 2nd, to water soluble medicaments such as the SYNTHETIC OPTICAL WHITNER added in the calcium hydroxide refining, crystal formation directed agents, surface treatment agents, finally all enter filtrate, if this filtrate is not removed impurity and is reached producing harmful ion etc., crystalline form and the quality product of nano-calcium carbonate will be affected, so can not be for the maximum digestion section of water consumption (accounting for more than 90% of total water amount).
Summary of the invention
Technical problem to be solved by this invention is for above-mentioned deficiency of the prior art, utilization process and the equipment of press filtration waste water in a kind of nm-class active calcium carbonate production are provided, the present invention can purify the press filtration waste water in nm-class active calcium carbonate production fully, make it reach the water supply standard of can repeated application producing in nm-class active calcium carbonate, realize recycle.
The technical solution adopted for the present invention to solve the technical problems is: the utilization process of press filtration waste water in nm-class active calcium carbonate production comprises following steps:
(1) organic floculant is slowly added in the material-compound tank that clear water is housed, under rapid stirring, make emulsion state solution;
(2) the emulsion state solution with water made in step (1) being diluted to concentration is 0.1%～0.5%;
(3) after in the activation pot in the activating process of the ripe slurry of calcium carbonate at nm-class active calcium carbonate, having activated, the solution after dilution in step (2) is introduced to activation pot, continue rapid stirring 10-15min;
(4) slurry after rapid stirring 10-15min in step (3) is carried out to the barrier film press filtration, drainage enters the production settling bowl, adds inorganic conditioning agent, regulates between pH=7～9, and the clear water of overflow is just in the production that applies to nm-class active calcium carbonate capable of circulation; Produce simultaneously a small amount of throw out.
Be further: the organic floculant in above-mentioned steps (1) is the PAM analog derivative of molecular weight in 800-1200 ten thousand scopes.
Be further: in above-mentioned steps (2) concentration be the weight of 0.1%～0.5% organic floculant be the ripe slurry of calcium carbonate admittedly contain 0.01%～0.1%.
Be further: the inorganic conditioning agent of the adjusting pH value in above-mentioned steps (4) is vitriol, and calcium ion and hydroxide ion a small amount of in this vitriol and filtrate are produced throw out.
Be further: above-mentioned vitriol is Tai-Ace S 150 or zinc sulfate.
Be further: also comprise that the throw out of producing in step (4) is sent into to the slag stock pump squeezes into the step that pressure filter reclaims.
The invention also discloses the equipment that adopts the utilization process of press filtration waste water in above-mentioned nm-class active calcium carbonate production, comprise the PAM material-compound tank connected successively by pipeline, activation pot, pressure filter, settling bowl, clean water basin; On settling bowl, also by pipeline, be connected with the vitriol material-compound tank.
The present invention compared with prior art has the following advantages:
The present invention, by adding a small amount of organic floculant (polyacrylamide) and mineral sulfates, can improve the solid content of pressure filter water, saves drying cost, recycles press filtration water, saves water source, protection of the environment, Resource Recycling Utilization; The pH value of the final water reclaimed and indices all are able to be directly used in the requirement that nm-class active calcium carbonate is produced; Operating process is simple, and the quality of production is easy to control, and the present invention can bring good economic benefit, social benefit and environmental benefit.
The accompanying drawing explanation
Fig. 1 is device structure schematic diagram of the present invention.
Description of reference numerals:
The 1-PAM material-compound tank, 2-activation pot, 3-pressure filter, 4-settling bowl, 5-vitriol material-compound tank, 6-clean water basin.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the invention is described:
In the present invention, in the calcium carbonate activation pot, add PAM analog derivative flocculation agent.Polyacrylamide (PAM) is polymerized by acrylamide monomer, it is a kind of water-soluble linear macromolecule polymkeric substance, in water, can most of ionize, belong to polymer electrolyte, non-dangerous goods, nontoxic, non-corrosiveness, be heated to 100 ℃ and have good stability, can derive other many kinds of substances by hydroxylating, sulfo group reaction, crosslinking reaction etc.
The nonpolar charged group of flocculation agent can in and the electrokinetic potential of suspended particle surface and foreign ion, foreign ion can and be adsorbed on surface between the reduction suspended particle makes their flocculations, polar group again can with the crosslinked winding of the polar group of activator, form the three-dimensional netted interpolymer of calcium carbonate-activator non-polar group-activator polar group-flocculation agent polar group-linking agent non-polar group-calcium carbonate, the settling rate of quickening calcium carbonate slurry under the ordering about of action of gravity, and then form water sludge interface clearly with the upper strata primary water, when the barrier film press filtration, not only can improve consolidating of filter cake contains, the clear press filtration water obtained stages that is applied to nano-calcium carbonate production capable of circulation also after adjusting pH, turn waste into wealth, realize the recycling of sewage.
The present invention comprises following steps:
(1) by molecular weight, be that the PAM analog derivative flocculation agent of 800-1200 ten thousand slowly adds in the material-compound tank 1 that clear water is housed, under rapid stirring, make emulsion state solution;
(2) concentration of adjustment flocculant solution is 0.1-0.5%, and consumption is the 0.01-0.1% of the ripe slurry weight of calcium carbonate;
(3) after calcium carbonate emulsion (ripe slurry) has activated, emulsion state solution is introduced to activation pot 2, continue rapid stirring 10-15min;
(4) slurry is pumped into to pressure filter 3, the water outlet of carrying out after the barrier film press filtration enters settling bowl 4, after the filter cake press filtration that adds polyacrylamide flocculant, the filter cake solid content is by the 45-48% that does not add polyacrylamide flocculant, be reduced to 40-42%, moisture has reduced 3-5%, can save the oven dry cost.
(5) in material-compound tank 5, dissolve the vitriol such as Tai-Ace S 150, zinc sulfate, in settling bowl, add the vitriol dissolved until between pH=7-9, the vitriol such as while Tai-Ace S 150, zinc sulfate, can with a small amount of calcium ion (Ca2+) and hydroxide ion (OH-) in filtrate, generate throw out, Al (OH) 3, Zn (OH) 2, CaSO4, by the slag stock pump, squeeze into pressure filter and reclaim, the stages that the clear water after overflow can be used for producing.
In above-mentioned inorganic conditioning agent, the medicament of regulating the pH value is the vitriol such as Tai-Ace S 150, zinc sulfate, can with a small amount of calcium ion (Ca2+) and hydroxide ion (OH-) in filtrate, generate throw out, Al (OH) 3, Zn (OH) thus 2 make press filtration water become clear.The chemical formula of its reaction is:
3Ca2++6OH-+Al2(SO4)3=?2Al(OH)3+3CaSO４
3H2O+3CaCO3+Al2(SO4)3=?2Al(OH)3+3CaSO４+3CO2
Ca2++2OH-+ZnSO4=?Zn(OH)2+CaSO４
H2O+CaCO3+ZnSO4=?Zn(OH)2+CaSO４+CO2
According to thinking of the present invention, we have been following experiment and contrast experiment:
Experiment 1:
In material-compound tank, add 50 kilograms of clear water, slowly adding 100 gram molecular weights is the PAM class flocculation agent of 800-1200 ten thousand, under rapid stirring, makes emulsion state solution after 10 minutes.Joining volume is 5m3, contain in 500 kilograms of calcium carbonate slurries that activated, consumption is 0.02% of the ripe slurry weight of calcium carbonate, and after pressure filter, filter cake moisture is 42%, press filtration water flows into settling bowl, settling bowl is added in 0.2 kilogram, the Tai-Ace S 150 that dissolved in material-compound tank, stirs after 10 minutes, records the water overflowed, range estimation, for suspension free clear water, records pH=7.3.
Experiment 2:
In material-compound tank, add 200 kilograms of clear water, slowly adding 500 gram molecular weights is the PAM class flocculation agent of 800-1200 ten thousand, under rapid stirring, makes emulsion state solution after 10 minutes.Joining volume is 10m3, contain in 1500 kilograms of calcium carbonate slurries that activated, consumption is 0.033% of the ripe slurry weight of calcium carbonate, and after pressure filter, filter cake moisture is 41%, press filtration water flows into settling bowl, settling bowl is added in 0.3 kilogram, the zinc sulfate that dissolved in material-compound tank, stirs after 10 minutes, records the water overflowed, range estimation, for suspension free clear water, records pH=7.5.
The contrast experiment 1:
Joining volume is 10m3, contains in 1500 kilograms of calcium carbonate slurries that activated, and does not add PAM class flocculation agent, and after pressure filter, filter cake moisture is 46%, and press filtration water flows into settling bowl, records the water overflowed, and estimates as micro-milky clear water, records pH=9.6.
The above is explained in detail the preferred embodiment for the present invention by reference to the accompanying drawings, but the invention is not restricted to above-mentioned embodiment, in the ken that those of ordinary skills possess, can also under the prerequisite that does not break away from aim of the present invention, make a variety of changes.
Do not break away from the spirit and scope of the present invention and can make many other changes and remodeling.Should be appreciated that and the invention is not restricted to specific embodiment, scope of the present invention is defined by the following claims.
Claims (7)
- Nm-class active calcium carbonate produce in the utilization process of press filtration waste water, comprise following steps:(1) organic floculant is slowly added in the material-compound tank that clear water is housed, under rapid stirring, make emulsion state solution;(2) the emulsion state solution with water made in step (1) being diluted to concentration is 0.1%～0.5%;(3) after in the activation pot in the activating process of the ripe slurry of calcium carbonate at nm-class active calcium carbonate, having activated, the solution after dilution in step (2) is introduced to activation pot, continue rapid stirring 10-15min;(4) slurry after rapid stirring 10-15min in step (3) is carried out to the barrier film press filtration, drainage enters the production settling bowl, adds inorganic conditioning agent, regulates between pH=7～9, and the clear water of overflow is just in the production that applies to nm-class active calcium carbonate capable of circulation; Produce simultaneously a small amount of throw out.
- Nm-class active calcium carbonate as claimed in claim 1 produce in the utilization process of press filtration waste water, it is characterized in that: the organic floculant in step (1) is the PAM analog derivative of molecular weight in 800-1200 ten thousand scopes.
- Nm-class active calcium carbonate as claimed in claim 1 or 2 produce in the utilization process of press filtration waste water, it is characterized in that: in step (2) concentration be the weight of 0.1%～0.5% organic floculant be the ripe slurry of calcium carbonate admittedly contain 0.01%～0.1%.
- Nm-class active calcium carbonate as claimed in claim 1 produce in the utilization process of press filtration waste water, it is characterized in that: the inorganic conditioning agent of the adjusting pH value in step (4) is vitriol, and calcium ion and hydroxide ion a small amount of in this vitriol and filtrate are produced throw out.
- Nm-class active calcium carbonate as claimed in claim 4 produce in the utilization process of press filtration waste water, it is characterized in that: described vitriol is Tai-Ace S 150 or zinc sulfate.
- 6. as the utilization process of press filtration waste water in claim 1 or 4 or 5 described nm-class active calcium carbonates productions, it is characterized in that: also comprise that the throw out of producing in step (4) is sent into to the slag stock pump squeezes into the step that pressure filter reclaims.
- 7. adopt the equipment of the utilization process of press filtration waste water in the described nm-class active calcium carbonate production of claim 1～6, it is characterized in that: comprise the PAM material-compound tank (1) connected successively by pipeline, activation pot (2), pressure filter (3), settling bowl (4), clean water basin (6); On settling bowl (4), also by pipeline, be connected with vitriol material-compound tank (5).
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| CN201310174538.XA CN103408157B (en) | 2013-05-13 | 2013-05-13 | Nm-class active calcium carbonate produce in the utilization process of press filtration waste water and equipment |
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| CN201310174538.XA CN103408157B (en) | 2013-05-13 | 2013-05-13 | Nm-class active calcium carbonate produce in the utilization process of press filtration waste water and equipment |
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| CN103408157B CN103408157B (en) | 2015-10-07 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105461113A (en) * | 2015-12-25 | 2016-04-06 | 安徽省宣城市华纳新材料科技有限公司 | Nano-calcium carbonate filter-pressing wastewater treatment device |
| CN105540813A (en) * | 2015-12-25 | 2016-05-04 | 广西华纳新材料科技有限公司 | Nano calcium carbonate filter pressing wastewater treatment method and equipment |
| CN110697754A (en) * | 2019-10-31 | 2020-01-17 | 山西兰花华明纳米材料股份有限公司 | Method for preparing industrial precipitated calcium carbonate by recycling nano calcium carbonate filter pressing water |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1110253A (en) * | 1994-04-15 | 1995-10-18 | 轻工业部造纸工业科学研究所 | Method for preparation of superfine ground calcium carbonate |
| CN102602973A (en) * | 2012-01-13 | 2012-07-25 | 中国中材国际工程股份有限公司 | Method for synthesizing ultrafine calcium carbonate by utilizing carbide slag |
-
2013
- 2013-05-13 CN CN201310174538.XA patent/CN103408157B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1110253A (en) * | 1994-04-15 | 1995-10-18 | 轻工业部造纸工业科学研究所 | Method for preparation of superfine ground calcium carbonate |
| CN102602973A (en) * | 2012-01-13 | 2012-07-25 | 中国中材国际工程股份有限公司 | Method for synthesizing ultrafine calcium carbonate by utilizing carbide slag |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105461113A (en) * | 2015-12-25 | 2016-04-06 | 安徽省宣城市华纳新材料科技有限公司 | Nano-calcium carbonate filter-pressing wastewater treatment device |
| CN105540813A (en) * | 2015-12-25 | 2016-05-04 | 广西华纳新材料科技有限公司 | Nano calcium carbonate filter pressing wastewater treatment method and equipment |
| CN110697754A (en) * | 2019-10-31 | 2020-01-17 | 山西兰花华明纳米材料股份有限公司 | Method for preparing industrial precipitated calcium carbonate by recycling nano calcium carbonate filter pressing water |
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