CN108191364B - Modification method of phosphogypsum building gypsum product - Google Patents
Modification method of phosphogypsum building gypsum product Download PDFInfo
- Publication number
- CN108191364B CN108191364B CN201711349461.XA CN201711349461A CN108191364B CN 108191364 B CN108191364 B CN 108191364B CN 201711349461 A CN201711349461 A CN 201711349461A CN 108191364 B CN108191364 B CN 108191364B
- Authority
- CN
- China
- Prior art keywords
- phosphogypsum
- water
- building gypsum
- gypsum powder
- retarder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- C04B28/143—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 phosphogypsum
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00991—Uses not provided for elsewhere in C04B2111/00 for testing
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
The invention relates to a method for modifying a phosphogypsum building gypsum product, which comprises the following steps: (1) mixing phosphogypsum building gypsum powder with quick lime uniformly; (2) adjusting the pH value of the process water to 3-5, and adding a modified material, a water reducing agent and a retarder; (3) measuring the water consumption of standard consistency and the initial setting and final setting time when different additives are dissolved; (4) weighing the mixture prepared in the step (1), adding the mixture into standard-consistency water in which a modified material, a water reducing agent and a retarder are dissolved, and preparing a test piece; (5) the product was measured for 2h and oven dry strength. The method can effectively improve the strength of the gypsum product, improves the performance of the building gypsum powder produced by the phosphogypsum, and provides a feasible technical method for the phosphogypsum building gypsum product.
Description
Technical Field
The invention relates to a modification method of a phosphogypsum building gypsum product, belonging to the technical field of resource utilization of industrial solid wastes and preparation of building materials.
Background
The gypsum product has the functions of light weight, fire resistance, humidity regulation, decoration and the like, so the gypsum product has a very wide application market in the field of construction, and the phosphogypsum is solid waste associated in the production process of high-concentration phosphate fertilizer, generally mainly adopts a dihydrate process and mainly comprises CaSO as a main component4·2H2The O content is usually more than 85 percent and is similar to that of natural gypsum, but because the O content contains impurities such as soluble phosphorus, eutectic phosphorus, organic matters and the like, the crystal habit of dihydrate gypsum is seriously influenced when the hemihydrate gypsum prepared from the phosphogypsum is hydrated, and the crystal habit is the main reason for causing the phosphogypsum to be difficult to be effectively utilized in the traditional building field, so the resource utilization of the phosphogypsum is still a worldwide difficult problem and is one of key factors for restricting the sustainable development of the phosphorus chemical industry.
In order to solve the problem of influence of impurities in the phosphogypsum on the performance of building gypsum products, a great deal of research work is done by vast scientists, such as: CN201610400681.X discloses a catalyst for inducing refinement of gypsum crystal structure, which is prepared from the following raw materials in percentage by weight: 85-95% of dihydrate gypsum, 1-5% of modified starch, 1-5% of polyhydroxy carbohydrate and 1-5% of calcium formate; CN200910116180.9 discloses modified phosphogypsum powder and a product thereof, wherein the phosphogypsum accounts for 70-75%, the crystal transformation agent accounts for 1-5%, and the activating agent accounts for 20-25%; the crystal transformation agent is one or more than two of aluminum sulfate, ferric sulfate and sodium sulfate; the activating agent is one or more than two of slag, cement, quicklime, alum slag and high alumina; preparing raw materials of a crystal transition agent into an aqueous solution, mixing the raw materials of an activating agent, grinding the mixture into powder, scattering the agglomerated phosphogypsum, and carrying out rolling, mixing, curing and grinding on the powder to obtain modified phosphogypsum powder; CN201611008874.7 discloses a method for preparingThe method for preparing the modified phosphogypsum cementing material from the phosphogypsum comprises the steps of washing, dehydrating, crushing and ball-milling the phosphogypsum, and mixing the phosphogypsum with phosphorus tailings and industrial furnace slag according to the dry-basis mass ratio of 85: 3-5: 8-12 to obtain the modified phosphogypsum; CN106698988A discloses a carbonate rock modified phosphogypsum, which comprises 70-80% of phosphogypsum, 20-30% of carbonate rock powder and 100-140% of water, wherein the water comprises free water in the phosphogypsum; CN201410507628.0 discloses a modified phosphogypsum and a preparation method and application thereof, wherein 0.2-0.9 part of phosphogypsum, 0.9-8.1 parts of papermaking white mud and kiln dust: accounting for 0.5-3% of the total amount of the modified phosphogypsum; CN201510702127.2 discloses a preparation method of modified phosphogypsum, which is characterized in that the phosphogypsum is calcined for 1-5 hours at a flue gas temperature of 900-1100 ℃ in an inert gas atmosphere to obtain a product; CN201210242706.X discloses a modified phosphogypsum and a preparation method thereof, wherein the modified phosphogypsum is prepared by mixing, wetly grinding and then aging phosphogypsum, general purpose portland cement and water; CN201510017885.0 discloses an ardealite modified reinforced damp-proof gypsum block, 40-120 parts of semi-hydrated gypsum; 6-25 parts of gasified blast furnace slag superfine powder; 0.5-4 parts of an activator; 20-120 parts of water; CN201110188922.6 discloses a modification and harmless treatment method of phosphogypsum, which comprises the following steps: (1) cleaning, (2) neutralizing, (3) dehydrating, (4) calcining, and (5) packaging; CN200810058323.0 discloses a method for producing building gypsum by using modified phosphogypsum, which comprises crushing raw material phosphogypsum and carbide slag, and then mixing the crushed raw material phosphogypsum and carbide slag with modifier Al2O3And the rare earth metal are mixed according to the weight ratio of 76-88: 5-15: 3-10: 0.5-1.5, granulated and modified by calcination.
In order to solve the influence of impurities in the phosphogypsum on the performance of building gypsum products, a great deal of research work is done by scientists, but the phosphogypsum is mainly washed by water, and a modifier or a water-hardening cementing material such as slag, fly ash and the like is added in the product process to modify the prepared building gypsum products.
Disclosure of Invention
The invention aims to improve the performance of building gypsum powder by adding a modified material aiming at the actual condition of low strength of the building gypsum powder produced by the existing phosphogypsum on the premise of not changing the production process of the building gypsum powder, meet the requirements of the building material field on gypsum products and finally realize the large-scale utilization of the phosphogypsum.
The invention is completed by the following technical scheme:
a method for modifying a phosphogypsum building gypsum product comprises the following specific steps:
(1) adding quicklime according to 1-3% of the weight of the phosphogypsum building gypsum powder, and fully and uniformly mixing for later use;
(2) adjusting the acidity of the process water by using sulfuric acid, nitric acid or hydrochloric acid to enable the pH value of the process water to be 3-5, and then adding a modifying material, a water reducing agent and a retarder according to the process requirements;
(3) measuring the water consumption of standard consistency and the initial setting time and the final setting time when different additives are dissolved according to the GB/T17669.4-1999 standard, and meeting the requirements specified in GB/T9776-2008;
(4) weighing the mixture prepared in the step (1), adding the mixture into standard consistency water dissolved with a modified material, a water reducing agent and a retarder, and preparing a test piece according to GB/T9776-2008 building gypsum standard;
(5) the 2h and oven dry strength of the product were determined according to the GB/T17669.3-1999 Standard.
The phosphogypsum building gypsum powder is a commercially available beta-type hemihydrate gypsum produced by dehydrating phosphogypsum by a dry method; the phosphogypsum building gypsum product is a product obtained by hydrating phosphogypsum building gypsum powder with water.
In the step (1), the particle size of the quicklime is less than 2 percent of the sieve residue of 200 meshes.
The modified material in the step (2) is ferrous or aluminum strong acid salt, namely ferrous salt or aluminum salt corresponding to sulfuric acid, nitric acid and hydrochloric acid, which can be used singly or in a mixed way, and the addition amount of the modified material is 0.5-3.0% of the weight of the phosphogypsum building gypsum powder.
In the step (2), the water reducing agent is calcium lignosulphonate and polycarboxylic acid, and the adding amount of the water reducing agent is 0.1-0.5% of the weight of the phosphogypsum building gypsum powder.
In the step (2), the retarder is bone collagen, and the addition amount of the retarder is 0.01-0.1% of the mass of the phosphogypsum building gypsum powder.
The theoretical basis is as follows: after the building gypsum is added with water, the building gypsum is firstly dissolved in the water, then the building gypsum is subjected to hydration reaction with the water to generate calcium sulfate dihydrate, the generated colloidal particles of the dihydrate gypsum are continuously increased along with the continuous progress of hydration, meanwhile, the free water in the slurry is continuously reduced along with the hydration and the evaporation, the consistency of the slurry is continuously increased, the cohesive force among the colloidal particles is gradually enhanced, the plasticity of the slurry is gradually lost, and the slurry is gradually coagulated. The continuous hydration, the colloid is transformed into crystal and the particle grows up gradually, the plasticity of the slurry is completely lost, and the strength is generated, namely the slurry is hardened. The process is continuously carried out until the hemihydrate gypsum is completely hydrated to generate dihydrate gypsum, and the strength is not increased any more, so that the gypsum product is obtained.
On one hand, the water consumption of the building gypsum prepared from the phosphogypsum in the standard consistency is more than 70 percent, the theoretical water demand of the building gypsum hydration is 18.6 percent, and a large amount of capillary pores are formed in the building gypsum product due to the evaporation of a large amount of free water, so that the porosity of the gypsum product is large; on the other hand, the existence of eutectic phosphorus and soluble phosphorus in phosphogypsum can seriously affect the crystallinity and the shape and the size of hydrate of the building gypsum product prepared by the phosphogypsum, so that dihydrate gypsum crystals are fine, and the product strength is low.
By combining the gypsum hardening mechanism and the reason that the strength of the phosphogypsum product is low, the invention adds ferrous and aluminum strong acid salts to ensure that the concentration of the ferrous and aluminum strong acid salts is continuously increased along with the evaporation of the water in the gypsum product and then hydrolyzed to form colloids, and the colloids fill the gaps caused by the evaporation of the water on one hand, and on the other hand, the inorganic macromolecules can provide a cementing network for hydrated dihydrate gypsum crystals to increase the bonding force, thereby improving the strength of the gypsum product.
The invention has the beneficial effects that:
1. the invention does not need to change the production process of producing the building gypsum powder by the phosphogypsum, and only when the product is prepared by using the phosphogypsum building powder, the modified material, the water reducing agent and the retarder are added into the process water with the pH value adjusted to the specified range, so that the aim of improving the strength of the gypsum product can be achieved, and the production equipment and the process of the gypsum product do not need to be changed;
2. compared with a comparative experiment (without adding any additive), the gypsum product produced by the method has the advantages that the bending strength and the compressive strength are obviously improved within 2 hours, the oven-dry bending strength is improved by more than 48 percent, the compressive strength is improved by more than 55 percent, and the modification effect is very obvious;
3. after the building gypsum powder prepared from the phosphogypsum is modified by the method, the flexural strength and the compressive strength of 2h can meet the requirements of grade 1.6 and above in the GB/T9776-2008 specification, and the bottleneck problem of low strength of the building gypsum prepared from the phosphogypsum is fundamentally solved.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
In order to compare the modification effect, the commercially available phosphogypsum building gypsum powder is respectively used for measuring the water consumption of the standard consistency, the initial setting time and the final setting time according to the relevant national standard, test pieces are prepared and tested for 2h and absolute dry strength, and the result is shown in table 1.
Table 1 phosphogypsum construction gypsum powder physical property test result table
Example 1
(1) Weighing 2000g of phosphogypsum building gypsum powder, adding 20g of 1% of quicklime, and fully and uniformly mixing;
(2) adjusting the pH value of the process water to 5.0 by using sulfuric acid for later use;
(3) the modified material is ferrous chloride, the addition amount of the modified material is 0.5 percent of the mass of the gypsum powder, the water reducing agent is polycarboxylic acid, the amount of the polycarboxylic acid is 0.5 percent of the mass of the gypsum powder, the addition amount of the retarder bone collagen is 0.01 percent of the mass of the gypsum powder, the water consumption (based on the gypsum powder) of standard consistency is predicted according to a comparative experiment and is weighed as process water, and the materials are added into the process water to be dissolved;
(4) the water consumption, initial setting and final setting time for the experimental standard consistency were measured, and then test pieces were prepared and measured for 2h and oven dry strength, and the results are shown in table 2.
Table 2 physical property test result table of modified phosphogypsum building gypsum powder
Example 2
(1) Weighing 2000g of phosphogypsum building gypsum powder, adding 40g of 2% quicklime, and fully and uniformly mixing;
(2) adjusting the pH value of the process water to 3.0 by using hydrochloric acid for later use;
(3) the modified material is ferrous nitrate and aluminum chloride, the adding mass ratio of the ferrous nitrate to the aluminum chloride is 1:2, the adding total amount is 3.0 percent of the mass of the gypsum powder, the water reducing agent is calcium lignosulfonate, the adding amount of the calcium lignosulfonate is 0.1 percent of the mass of the gypsum powder, the adding amount of the retarder bone collagen is 0.1 percent of the mass of the gypsum powder, the water consumption of standard consistency (taking the gypsum powder as the reference) is predicted according to a comparative experiment, the process water is weighed, and the substances are added into the process water to be dissolved;
(4) the water consumption, initial setting and final setting time for the experimental standard consistency were measured, and then test pieces were prepared and measured for 2h and oven dry strength, and the results are shown in table 3.
Table 3 physical property test result table of modified phosphogypsum building gypsum powder
Example 3
(1) Weighing 2000g of phosphogypsum building gypsum powder, adding 60g of 3% quicklime, and fully and uniformly mixing;
(2) adjusting the pH value of the process water to 4.0 by using nitric acid for later use;
(3) the modified material is ferrous sulfate and aluminum sulfate, the adding mass ratio of the ferrous sulfate to the aluminum sulfate is 1:1, the adding amount is 2.0 percent of the mass of the gypsum powder, the water reducing agent is polycarboxylic acid, the adding amount is 0.3 percent of the mass of the gypsum powder, the adding amount of the retarder bone collagen is 0.05 percent of the mass of the gypsum powder, the water consumption of standard consistency (based on the gypsum powder) is predicted according to a comparative experiment, the process water is weighed, and the materials are added into the process water to be dissolved;
(4) the water consumption, initial setting and final setting time for the experimental standard consistency were measured, and then test pieces were prepared and measured for 2h and oven dry strength, and the results are shown in table 4.
Table 4 modified phosphogypsum building gypsum powder physical property test result table
Example 4
(1) Weighing 2000g of phosphogypsum building gypsum powder, adding 40g of 2% quicklime, and fully and uniformly mixing;
(2) adjusting the pH value of the process water to 3.5 by using sulfuric acid for later use;
(3) the modified material is aluminum nitrate, the total addition amount is 1.5 percent of the mass of the gypsum powder, the water reducing agent is calcium lignosulfonate, the amount of the calcium lignosulfonate is 0.4 percent of the mass of the gypsum powder, the addition amount of the retarder bone collagen is 0.03 percent of the mass of the gypsum powder, the water consumption (based on the gypsum powder) for standard consistency is predicted according to a comparison experiment, the process water is weighed, and the substances are added into the process water for dissolution;
(4) the water amount, initial setting and final setting time for the experimental standard consistency were measured, and then test pieces were prepared and 2h and oven dry strength were measured, and the results are shown in table 5.
Table 5 modified phosphogypsum construction gypsum powder physical property test result table
Claims (5)
1. A method for modifying a phosphogypsum building gypsum product comprises the following specific steps:
(1) fully and uniformly mixing phosphogypsum building gypsum powder and quick lime;
(2) adjusting the pH value of the process water to 3-5, and then adding a modified material, a water reducing agent and a retarder;
(3) measuring the water consumption of standard consistency and the initial setting and final setting time when different additives are dissolved;
(4) weighing the mixture prepared in the step (1), adding the mixture into standard-consistency water in which a modified material, a water reducing agent and a retarder are dissolved, and preparing a test piece;
(5) 2h and absolute dry strength of the product are measured;
the modified material is any one or more of ferrous nitrate, ferrous chloride, aluminum nitrate and aluminum trichloride;
the water reducing agent is calcium lignosulphonate or polycarboxylic acid;
the retarder is bone glue protein.
2. The method according to claim 1, wherein the amount of quicklime is 1-3% of the weight of the phosphogypsum building gypsum powder.
3. A method according to claim 1 or 2, characterized in that the quicklime is in powder form and has a particle size of < 2% in the remaining 200 mesh sieve.
4. The process according to claim 1, characterized in that the pH of the process water is adjusted with sulfuric acid, nitric acid or hydrochloric acid.
5. The method according to claim 1, wherein the amount of the modifying material is 0.5-3.0% of the weight of the phosphogypsum building gypsum powder, the amount of the water reducing agent is 0.1-0.5% of the weight of the phosphogypsum building gypsum powder, and the amount of the retarder is 0.01-0.1% of the weight of the phosphogypsum building gypsum powder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711349461.XA CN108191364B (en) | 2017-12-15 | 2017-12-15 | Modification method of phosphogypsum building gypsum product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711349461.XA CN108191364B (en) | 2017-12-15 | 2017-12-15 | Modification method of phosphogypsum building gypsum product |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108191364A CN108191364A (en) | 2018-06-22 |
| CN108191364B true CN108191364B (en) | 2021-08-10 |
Family
ID=62574553
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711349461.XA Active CN108191364B (en) | 2017-12-15 | 2017-12-15 | Modification method of phosphogypsum building gypsum product |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108191364B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108892467B (en) * | 2018-10-10 | 2021-03-16 | 河南理工大学 | Building material product prepared from building gypsum and carbide slag and method thereof |
| CN109437640A (en) * | 2018-10-25 | 2019-03-08 | 昆明理工大学 | Composite modifier for ardealite building gypsum plaster |
| CN109384403A (en) * | 2018-12-04 | 2019-02-26 | 兰州宏方新型建材科技有限公司 | A kind of building gypsum that enhancing is modified |
| CN110451829B (en) * | 2019-08-21 | 2022-02-08 | 苏州市兴邦化学建材有限公司 | Phosphogypsum modifier and preparation method thereof |
| CN112324016A (en) * | 2020-11-16 | 2021-02-05 | 扬州工业职业技术学院 | Production method of recombined bamboo-phosphogypsum composite partition board |
| CN112479670A (en) * | 2021-01-12 | 2021-03-12 | 江苏顺丽成建筑新材料有限公司 | Gypsum thermal insulation interface agent |
| CN113979659A (en) * | 2021-10-25 | 2022-01-28 | 赵源 | Modified beta-phosphogypsum and modification method thereof, modifier for beta-phosphogypsum and application method thereof |
| CN116040971A (en) * | 2022-11-16 | 2023-05-02 | 中国建筑西南设计研究院有限公司 | Phosphogypsum-based binding gypsum powder, preparation method thereof and gypsum |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101475329A (en) * | 2009-02-09 | 2009-07-08 | 安徽德嘉新型建材有限公司 | Modified phosphogypsum powder and product thereof |
| KR100999354B1 (en) * | 2010-06-24 | 2010-12-09 | 청암산업건설 주식회사 | Mortar composition and constructing method thereof |
| CN103435302A (en) * | 2013-08-19 | 2013-12-11 | 四川省建材工业科学研究院 | Preparation method of high-performance composite gypsum cementing slurry |
| CN103496934A (en) * | 2013-09-18 | 2014-01-08 | 武汉理工大学 | Phosphogypsum-based surface layer plastering gypsum material and preparation method thereof |
| CN106145726A (en) * | 2016-05-24 | 2016-11-23 | 成都市斯贝佳科技有限公司 | The process of high-strength building gypsum prepared by a kind of ardealite |
-
2017
- 2017-12-15 CN CN201711349461.XA patent/CN108191364B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101475329A (en) * | 2009-02-09 | 2009-07-08 | 安徽德嘉新型建材有限公司 | Modified phosphogypsum powder and product thereof |
| KR100999354B1 (en) * | 2010-06-24 | 2010-12-09 | 청암산업건설 주식회사 | Mortar composition and constructing method thereof |
| CN103435302A (en) * | 2013-08-19 | 2013-12-11 | 四川省建材工业科学研究院 | Preparation method of high-performance composite gypsum cementing slurry |
| CN103496934A (en) * | 2013-09-18 | 2014-01-08 | 武汉理工大学 | Phosphogypsum-based surface layer plastering gypsum material and preparation method thereof |
| CN106145726A (en) * | 2016-05-24 | 2016-11-23 | 成都市斯贝佳科技有限公司 | The process of high-strength building gypsum prepared by a kind of ardealite |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108191364A (en) | 2018-06-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108191364B (en) | Modification method of phosphogypsum building gypsum product | |
| CN103086620B (en) | Gelatinizing agent suitable for unclassified tailing filling | |
| CN104987117B (en) | Environment protection architecture heat-barrier material | |
| CN112919854A (en) | Coal-based solid waste geopolymer cementing material and preparation method thereof | |
| CN101121579A (en) | Method for producing concrete active admixture by iron tailings | |
| CN110606722B (en) | Building wallboard and preparation method thereof | |
| CN113336516A (en) | Cementing material prepared from multi-element solid wastes and cooperative regulation and control method thereof | |
| Garg et al. | Development of alpha plaster from phosphogypsum for cementitious binders | |
| CN105174887A (en) | Modified desulphurization gypsum-based mater batch and preparation method therefor | |
| CN103274655A (en) | Solid sulfur ash masonry mortar | |
| CN103723988A (en) | Light and high strength aerated concrete prepared with glass powder and preparation method thereof | |
| CN101684675B (en) | Autoclaved phosphogypsum brick and method for preparing same | |
| CN113121138A (en) | Gypsum-based baking-free aggregate | |
| CN114890693B (en) | Solid waste base gelling material and preparation method and application thereof | |
| CN110790553A (en) | Alkali-activated slag well cementation cement system capable of being regulated and controlled and method for regulating and controlling thickening time | |
| CN114605121B (en) | Tungsten tailing autoclaved aerated concrete and preparation method thereof | |
| WO2019232687A1 (en) | Ultra-rapid-hardening special inorganic cement material and preparation method therefor | |
| CN113292306A (en) | Roadside filling material | |
| CN113149551B (en) | Superfine sulfur-containing tailing concrete | |
| CN108911614A (en) | A method of air entrained concrete is prepared with modified quicklime-gangue and iron tailings | |
| CN103332875B (en) | A kind of industry by-product gypsum base composite gelled material and preparation method thereof | |
| CN102936121A (en) | Composite material used in mine roadway filling | |
| KR20120044014A (en) | Geopolymer composition having high strength and manufacturing method thereof | |
| CN101462864B (en) | Novel composite gel material and preparation | |
| CN106673574A (en) | Non-calcined desulfurized gypsum hydraulic composite gel system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20211014 Address after: 430000 No.8 Nanniwan Avenue, Qiaokou District, Wuhan City, Hubei Province Patentee after: Hubei Shenglong Recycling Resources Utilization Co.,Ltd. Address before: 650093 No. 253, Xuefu Road, Wuhua District, Yunnan, Kunming Patentee before: Kunming University of Science and Technology |