CN111689745A - Dry-mixed mortar containing sintering dry-process desulfurized ash and recycled water plant sludge - Google Patents
Dry-mixed mortar containing sintering dry-process desulfurized ash and recycled water plant sludge Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
- C04B28/142—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements
- C04B28/144—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being a flue gas desulfurization product
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- Organic Chemistry (AREA)
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Abstract
The invention discloses dry powder mortar containing sintering dry-process desulfurized fly ash and recycled water plant sludge and a preparation method thereof, which solve the technical problem of high manufacturing cost of the conventional dry powder mortar. The technical scheme of the invention is that the dry powder mortar containing the sintering dry-method desulfurized ash and the recycled water plant sludge comprises the following raw material components in percentage by mass: 20-28% of sintering dry desulfurization ash, 30-40% of recycled water plant sludge, 20-28% of sand, 10-12% of cement, 6-7% of fly ash, 1-3% of nano aluminum powder and 0.1-0.6% of sodium sulfate, wherein the sum of the mass percentages of the raw material components is 100%. The dry powder mortar has simple preparation process and low production cost, and realizes the value-added utilization of the sintering dry desulfurization ash, the recycled water plant sludge and the fly ash.
Description
Technical Field
The invention relates to dry powder mortar, in particular to dry powder mortar containing sintered dry desulfurization ash and recycled waterworks sludge and a preparation method thereof, belonging to the field of comprehensive utilization of dry powder mortar and solid waste resources in the field of building materials.
Background
In the field of building materials, compared with masonry mortar, the plastering mortar has the following characteristics: firstly, the plastering layer does not bear load; secondly, the plastering layer and the basal layer have enough bonding strength, so that the plastering layer and the basal layer do not fall off or crack under the action of self weight and environment for a long time in construction; thirdly, the coating surface layer is mostly a thin layer and is coated in layers, and the surface layer is required to be smooth, bright, clean, fine and beautiful; fourthly, the paint is mostly used in dry environment and is exposed in air in large area.
In order to ensure the workability, sag resistance, early strength improvement, construction convenience and the like of the dry powder mortar and facilitate the improvement of the compactness and work efficiency of the masonry, a certain amount of calcareous materials are usually added into the dry powder mortarSuch as lime (main component slaked lime), sierozem powder (main component Ca (OH))2CaO and CaCO3) Heavy calcium powder (main component calcium carbonate) or fly ash and the like.
In the steel production process, sulfur dioxide is one of the main pollutants, mainly from flue gas generated by the sintering process. According to statistics, the sulfur dioxide discharged by the sintering process accounts for more than 60% of the total discharge amount of steel production. At present, the common flue gas desulfurization processes used by iron and steel enterprises include wet method, dry method, semi-dry method, ammonia method and the like. The dry desulfurization process has the advantages of low water consumption, low investment, high desulfurization rate, no wastewater, good matching property with a unit and the like, well overcomes some problems and defects of the wet desulfurization process, and is applied in a large range; however, the desulfurization by-products of the dry desulfurization process contain unstable calcium sulfite hydrate, calcium carbonate and other substances, which affect the utilization of the desulfurization by-products, and enterprises basically treat the sintered dry desulfurization ash in a landfill mode or a stacking mode.
Chinese patent application publication No. CN104059419A discloses a semidry desulfurized fly ash exterior wall putty, and discloses a method for preparing exterior wall putty powder by using semidry desulfurized fly ash, which comprises drying semidry desulfurized fly ash at 100 ℃, drying steel slag, and grinding into sand particles by using a ball mill; drying industrial slag, grinding the industrial slag into slag micro powder, and mixing 25-35% of semi-dry desulfurized fly ash, 30-50% of steel slag, 20-30% of slag micro powder, 10-25% of double flying powder, 0-5% of water-retaining agent and 0-5% of latex powder to obtain the slag-free desulfurized fly ash; the semi-dry desulfurized fly ash is dried at the temperature of 100 ℃ to remove free water, so that the activity of the semi-dry desulfurized fly ash is obviously reduced, and the original gelation effect is lost; the semi-dry desulfurized fly ash has a gelatinization function which is not utilized, the utilization value of the desulfurized fly ash is not effectively exerted, and meanwhile, the baking device is adopted in the technical scheme to consume heat energy, so that the production cost is increased; in addition, a large amount of steel slag, slag micropowder and other substances are used, and the steel slag and the slag micropowder can be processed into other high value-added products.
The prior dry powder mortar containing the sintering dry desulfurization ash adopts sand as main aggregate, but the exploitation of stones and sand in natural resources in China is gradually limited at present, so that the dry powder mortar containing the sand has high cost.
Disclosure of Invention
The invention aims to provide dry powder mortar containing sintered dry desulfurization ash and recycled water plant sludge and a preparation method thereof, and solves the technical problem of high manufacturing cost of the conventional dry powder mortar.
The invention adopts the technical scheme that the dry powder mortar containing the sintering dry-method desulfurized ash and the recycled water plant sludge comprises the following raw material components in percentage by mass: 20-28% of sintering dry desulfurization ash, 30-40% of recycled water plant sludge, 20-28% of sand, 10-12% of cement, 6-7% of fly ash, 1-3% of nano aluminum powder and 0.1-0.6% of sodium sulfate, wherein the sum of the mass percentages of the raw material components is 100%.
The sintering dry desulfurization ash adopted by the invention is sintering desulfurization ash produced by a circulating fluidized bed dry sintering desulfurization process with lime as a desulfurizing agent, is usually light red powder, has the particle diameter of about several microns to tens of microns, contains a small amount of bound water, is easy to form slurry by adding water and stirring, and has good viscosity. The desulfurization ash obtained by the sintering dry method contains calcium sulfite, limestone and a small amount of calcium hydroxide, calcium sulfate, calcium chloride, calcium fluoride and SiO2、MgO、Al2O3、Fe2O3The sintering dry-method desulfurized fly ash comprises the following main components in percentage by mass: CaSO3·1/2H2O 50～60％、CaCO320～30％、CaSO4·2H2O 0～2％、Ca(OH)25 to 6%, and a bulk density of 0.85 to 1.0t/m3The true density is 2.25 to 2.69t/m3。
Therefore, the main components of the sintering dry-method desulfurized fly ash are calcium base and fly ash. Wherein the calcium group comprises: calcium sulfite (CaSO)3·1/2H2O), calcium carbonate (CaCO)3) Slaked lime (Ca (OH)2) Calcium sulfate (CaSO4 & 2H)2O) and the like, the fly ash itself has no gelling property but is similar to Ca (OH) contained in the dry desulfurized fly ash2Act, a cementitious reaction occursThe reaction formula is as follows: ca (OH)2+SiO2+(n-1)H2O＝(CaO*SiO2*nH2O (calcium silicate)
The only difference between the dry desulfurized fly ash and other materials is that the dry desulfurized fly ash contains a certain amount of calcium sulfite (CaSO)3·1/2H2O), has certain activity. Theoretical analysis and experiment prove that the decomposition temperature of the calcium sulfite is 580 ℃, and the calcium sulfite is mixed with cement (pH) in an alkaline environment>12) The calcium sulfite is very stable, and the calcium sulfite is used as a blending material and added into the ready-mixed mortar, so that the use amounts of white ash, ash calcium powder, coarse whiting powder, fly ash and the like can be saved. The dry desulfurization ash is used as one of the raw material components of the dry powder mortar, and the prejudice of the prior art is overcome.
In preparing dry mortar, slaked lime (Ca (OH)2) The calcium sulfite has the functions of gelation and slow coagulation respectively; among the two effects, the gelation effect is a functional effect, which has great influence on the strength and the working procedure, and the retardation effect is an auxiliary effect, which has little influence on the strength and the working procedure; therefore, the sintering dry desulphurization ash added into the dry powder mortar plays a role in adding slaked lime (Ca (OH)2) The definition is made as a leader. Based on the principle, the calcium sulfite of the sintering dry desulphurization ash has a gelling effect, and a great number of experiments show that the calcium sulfite can replace cement to play a role in dry powder mortar, so that the quantity of the replaced sand cannot be infinite, and the larger the replacement quantity is, the higher the layering degree is, the poorer the water retention property is and the poor wall plastering effect is, so that the certain addition quantity of the cement is also maintained in the invention; the sintering dry-method desulfurized ash containing calcium sulfite as a retarding material can prolong the construction time; through a large amount of experimental researches, the applicant finds that the mass percentage of the sintering dry-method desulfurized fly ash in the dry-mixed mortar is 20-28%, and the effect is good; the content of the sintering dry desulphurization ash in the dry powder mortar is higher than 28%, and the delayed coagulation of the calcium sulfite can not coagulate the dry powder mortar and can not form strength; sintering dry desulphurization in dry mortarThe ash content is lower than 20 percent, and the effect of fully utilizing solid wastes is not achieved.
The recycled water plant sludge is sludge in an industrial recycled water pool, and the recycled water plant sludge contains calcium oxide, silicon dioxide, aluminum oxide, MgO and Fe2O3And the mass percentage of the main components of the recycled water plant sludge is as follows: 20-25% of CaO and SiO215～30％、Al2O38～15％、MgO 20～35％、Fe2O325-35%; the forming process comprises the steps of drying the original recycled waterworks sludge, and grinding the dried recycled waterworks sludge into powder by using a powder machine, wherein the particle size of the recycled waterworks sludge is 1-3 mm, and the recycled waterworks sludge is a hydrophilic substance with a colloidal structure; the invention mainly utilizes the characteristics of alkalinity, water absorption and filling property of the desulfurized fly ash to be applied together with recycled waterworks sludge to play a role in bonding and solidifying; through a large number of experimental researches, the applicant finds that the addition amount of the sludge is less than 30%, the sludge cannot be consumed in a large amount, and the binding property of the sludge is higher than 40% and cannot meet the requirement after the sludge is used. The effect is good when 30 to 40 percent of the sludge of the water plant is recycled in the dry powder mortar.
The sand is common yellow sand, particularly river sand or river sand, the particle size of the yellow sand is 0.12-0.25 mm, the yellow sand is used as aggregate of dry powder mortar, and through a large amount of experimental researches, the applicant finds that the addition amount of the yellow sand is lower than 20%, the yellow sand cannot play a role of the aggregate, the cost of the product is higher after the yellow sand is used by more than 28%, and meanwhile, the exploitation of the river sand or the river sand is limited, and the cost is further increased due to the overhigh addition amount. The dry powder mortar has good effect when the mass content of the sand in the dry powder mortar is 20-28%.
The cement is ordinary portland cement, and through a large amount of experimental researches, the addition of the cement is less than 10%, the cement cannot play a role in bonding performance, the cost of the product is increased after the cement is used by more than 12%, and the cost can not be obviously improved by utilizing solid wastes. The applicant finds that the effect is good when the mass content of the cement in the dry-mixed mortar is 10-12%.
The fly ash is solid waste discharged from a coal-fired power plant, and the main components of the fly ash comprise the massThe percentage is as follows: SiO 2225～65％、Al2O320～40％、Fe2O31-6% of CaO and 10-16% of CaO, wherein SiO2、Al2O3And the sum of the mass percent of CaO and the mass percent of CaO is not less than 80 percent, and the fly ash and calcium hydroxide or other alkali metal hydroxides generate chemical reaction at normal temperature, particularly under the condition of hydrothermal treatment (steam curing), so as to generate a compound with hydraulic gelation performance, thereby becoming a material with increased strength and durability. Through a large number of experimental researches, the applicant finds that the effect is good when the mass content of the fly ash in the dry-mixed mortar is 6-7%.
The nano aluminum powder further enhances the early-stage gelation effect of the nano aluminum powder, prevents the dry powder mortar from falling off due to no early-stage gelation effect in use and further cannot be constructed, but has higher cost and small addition amount. Through a large number of experimental researches, the applicant finds that the effect is good when the mass content of the nano aluminum powder in the dry-mixed mortar is 1-3%.
The sodium sulfate is used as an air entraining agent, and aims to introduce micro bubbles into mortar through physical action, reduce the density of the mortar and ensure better construction performance; through a large number of experimental researches, the applicant finds that the effect is good when the mass content of the sodium sulfate in the dry-mixed mortar is 0.1-0.6%.
The preparation method of the dry powder mortar containing the sintering dry-method desulfurized fly ash and the recycled waterworks sludge comprises the following steps:
1) respectively weighing raw materials according to the proportion, sintering the dry desulfurization ash, recycling the water plant sludge, the sand, the cement, the fly ash, the nano aluminum powder and the sodium sulfate, and simultaneously putting the materials into a stirrer;
2) and (3) uniformly mixing the components for 35-40 min by using a stirrer to obtain the dry powder mortar.
According to the use method of the dry powder mortar containing the sintering dry desulfurization ash and the recycled water plant sludge, water is added into the dry powder mortar and uniformly stirred, and the mass ratio of the water to the dry powder mortar is 2/10-3/10.
The control of the water adding amount in the use of the dry powder mortar directly influences the use effect, the performance of the mortar is influenced when the water amount is too high or too low, the consistency, namely the thickness degree of the mortar is mainly influenced, the mortar becomes thin when too much water is added into the mortar, the thickness is too low, the mortar is easy to flow when the mortar is too thin and is smeared, and the layering is easy to occur; the mortar becomes thick and has high consistency when the water is added into the mortar too little, and the mortar is not easy to be leveled when the mortar is too thick and is plastered. When the dry powder mortar is used, the effect that the mass ratio of water to the dry powder mortar is 2/10-3/10 is good.
Compared with the prior art, the invention has the following positive effects: 1. compared with the common dry powder mortar, the consumption of cement and sand in the raw material components of the dry powder mortar is obviously reduced, the preparation process is simple, the production cost is low, and the value-added utilization of the sintering dry desulfurization ash, the recycled water plant sludge and the fly ash is realized. 2. The dry powder mortar has good use effect and stable performance, and meets the performance requirement of the national standard GB/T25181-2010. 3. The method utilizes the sintering dry-method desulfurized fly ash and the recycled water plant sludge of the iron and steel enterprises, consumes the solid waste in the enterprises, and achieves the aim of treating the waste by utilizing the complementary performance of the dry-method desulfurized fly ash and the recycled water plant sludge. 4. The invention does not need to calcine the sintering dry-method desulfurized fly ash, thereby saving energy.
Detailed Description
The present invention will be further described with reference to examples 1 to 5.
A dry powder mortar containing sintering dry desulfurization ash and recycled waterworks sludge comprises the following raw material components in percentage by mass: 20-28% of sintering dry desulfurization ash, 30-40% of recycled water plant sludge, 20-28% of sand, 10-12% of cement, 6-7% of fly ash, 1-3% of nano aluminum powder and 0.1-0.6% of sodium sulfate, wherein the sum of the mass percentages of the raw material components is 100%. The raw material ratio of the embodiment of the invention is shown in table 1.
The sand adopted in the embodiment is common river sand, and the particle size is 0.12-0.25 mm.
The preparation method of the dry powder mortar containing the sintered dry desulfurization ash and the recycled water plant sludge comprises the following steps:
1) respectively weighing raw materials according to the proportion, namely sintering dry-process desulfurized fly ash, recycled water plant sludge, sand, cement, fly ash, nano aluminum powder and sodium sulfate, and simultaneously putting into a stirrer;
2) and (3) uniformly mixing the components for 35-40 min by using a stirrer to obtain the dry powder mortar.
Table 1 raw material components of the dry-mixed mortar of the examples of the present invention, unit: and (4) percent by mass.
When the dry-mixed mortar is used, water is added into the dry-mixed mortar and uniformly stirred, the mass ratio of the water to the dry-mixed mortar is 2/10, after the dry-mixed mortar is used, the correlation performance is detected according to 'premixed mortar' GB/T25181-containing 2010, and the result is shown in Table 2.
TABLE 2 Performance parameters of the dry-mixed mortars according to the invention after use
As can be seen from Table 2, according to the formulations in examples 1-5, the four performance indexes of the obtained samples, namely the water retention rate, the setting time, the 14d tensile bonding strength and the 28d shrinkage rate, meet the requirements of the national standard GB/T25181-; the sintering dry-method desulfurized fly ash and the recycled water plant sludge in the raw material components of the dry-powder mortar can replace part of sand and cement, so that the application range of the sintering dry-method desulfurized fly ash is expanded, the solid waste in an enterprise is consumed, the aim of treating the waste by the waste is fulfilled by utilizing the complementary performance of the dry-method desulfurized fly ash and the recycled water plant sludge, the sand and the cement are saved, and the production cost of the enterprise is reduced.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (7)
1. A dry powder mortar containing sintering dry desulfurization ash and recycled waterworks sludge comprises the following raw material components in percentage by mass: 20-28% of sintering dry desulfurization ash, 30-40% of recycled water plant sludge, 20-28% of sand, 10-12% of cement, 6-7% of fly ash, 1-3% of nano aluminum powder and 0.1-0.6% of sodium sulfate, wherein the sum of the mass percentages of the raw material components is 100%.
2. The dry-mixed mortar containing the sintered dry-process desulfurized fly ash and the recycled waterworks sludge as set forth in claim 1, wherein the sintered dry-process desulfurized fly ash comprises the following main components in percentage by mass: CaSO3·1/2H2O 50～60％、CaCO320～30％、CaSO4·2H2O 0～2％、Ca(OH)25 to 6%, and a bulk density of 0.85 to 1.0t/m3The true density is 2.25 to 2.69t/m3。
3. The dry-mixed mortar containing sintered dry-process desulfurized ash and recycled waterworks sludge according to claim 1, wherein said fly ash component is SiO2、Al2O3And the sum of the CaO and the water content is not less than 80 percent.
4. The dry-mixed mortar containing sintered dry-process desulfurized ash and recycled water plant sludge according to claim 1, wherein the recycled water plant sludge comprises the following main components in percentage by mass: 20-25% of CaO and SiO215～30％、Al2O38～15％、MgO 20～35％、Fe2O325-35% and the grain diameter of the recycled waterworks sludge is 1-3 mm.
5. The dry-mixed mortar containing sintered dry-process desulfurized ash and recycled water plant sludge according to claim 1, wherein said river sand or river sand has a particle size of 0.12 to 0.25 mm.
6. The use method of the dry powder mortar containing the sintered dry desulfurization ash and the recycled water plant sludge according to any one of claims 1 to 5, comprising the step of adding water to the dry powder mortar and uniformly stirring, wherein the mass ratio of the water to the dry powder mortar is 2/10-3/10.
7. The process for preparing a dry mortar containing a sintered dry desulfurized fly ash and recycled waterworks sludge according to any one of claims 1 to 5, comprising the steps of:
1) weighing the sintering dry-process desulfurized fly ash, the sand, the cement, the fly ash and the nano aluminum powder according to the proportion, and putting the materials into a stirrer simultaneously;
2) and (3) uniformly mixing the components for 20min-30min by using a stirrer to obtain the dry powder mortar.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115231885A (en) * | 2022-08-03 | 2022-10-25 | 湖北省成美建材股份有限公司 | Novel dry-mixed masonry mortar |
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2019
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| DE4014553A1 (en) * | 1990-05-07 | 1991-11-14 | Wethmar Herbert Dipl Kaufm | Dry mortar mixt. prodn. - by simultaneous calcination of gypsum, drying moist additives and homogenisation of the mixt. |
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