CN117185760A
The application relates to the technical field of gypsum blocks, and in particular discloses a calcination-free desulfurized gypsum block and a preparation method thereof. The calcination-free desulfurized gypsum block is prepared from the following raw materials in parts by weight: 50-60 parts of dihydrate desulfurized gypsum; 10-15 parts of fly ash; 5-10 parts of slag …
Device and method for producing type II anhydrous gypsum …
Anhydrous gypsum and desulfurized gypsum technology, applied in chemical instruments and methods, inorganic chemistry, calcium/strontium/barium sulfate, etc., can solve problems such as increased processing costs, poor stability, and close temperature, and improve resource utilization The effect of high efficiency, stable performance and stable quality
High value-added utilization of desulfurized building …
The utilization of desulfurized building gypsum as raw material for gypsum-based self-leveling mortar (GSL) is limited by its low strength and poor water resistance. ... calcination temperature of β -hemihydrate gypsum is signicantly lower than that of cement, usually within a range of 135–180°C, and it can be fully recycled (Lushnikova and ...
Effect of desulfurization gypsum on alternating-current …
Subsequently, the discs were dried and placed in a high-temperature furnace for calcination, as shown in Fig. 2. The temperature was increased to 900 °C at a rate of 10 °C/min, then raised to 1280 °C at 5 °C/min, and held for 40 min. After calcination, the discs were quickly cooled down after being removed from the furnace.
Effect of desulfurization gypsum on alternating-current …
The main hydrate phase C 4 A 3 S̄ in BSAC has a very fast hydration rate, and most of them complete the release of hydration heat in 2–12 h [20]. The main hydration products of BSAC are ettringite (AFt), monosulfide calcium sulphoaluminate hydrate (AFm) and amorphous aluminum hydroxide (AH 3).These hydration products make the microstructure of cement-based …
Effect of Industrial Byproduct Gypsum on the
Its main components include desulfurized gypsum (DG), phosphogypsum (PG), and titanium gypsum (TG), with smaller amounts of fluorogypsum, salt gypsum, and others [1,2,3]. ... (CSA) is a cementitious material formed through the low-temperature calcination of raw materials such as limestone and gypsum, and it consists mainly of anhydrous calcium ...
High value-added utilization of desulfurized building …
In addition, the calcination temperature of β-hemihydrate gypsum is significantly lower than that of cement, usually within a range of 135–180 °C, and it can be fully recycled …
Study on the system of calcined desulfurization gypsum
gypsum was calcined in the DRY-36 high temperature industrial furnace of Shanghai Kecheng Company. The calcination system was as follows: heating up from room temperature to 800 …
CN101265042A
A two-step process for producing desulfurized gypsum comprises: the first step: gypsum dihydrate is pre-dried under such conditions that the drying temperature is 120-160 DEG C and the drying time is 3-10 seconds; and the second step: the dried gypsum is fed into a calcining furnace. The second step also involves the following steps: firstly, the dried materials for …
Calcination-free desulfurized gypsum dry mixed mortar
A technology for desulfurized gypsum and dry-mixed mortar, which is applied in sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problems of low storage, large investment, huge supporting facilities, etc., and achieves low cost and easy implementation. Effect
Air-swept Desulfurized Gypsum Calcin– Zhengzhou Taida …
Zhengzhou Taida new type desulfurized gypsum calcination drying equipment fills the technology gap at home. This kind of new type drying machine can not only dry materials with 95% moisture content, but also can calcine materials with less moisture co
Calcination-free desulfurized gypsum brick
The invention discloses a calcination-free desulfurized gypsum brick, pertaining to the production field of building bricks. The gypsum brick is produced by the following ingredients by weight proportion: 25-35 portions of desulfurized dehydrate gypsum; 10-20 portions of cement, 50-65 portions of aggregate, 0.2-1.5 portions of intensifier and 3-5 portions of solid-phase …
CN102140027A
The invention discloses a novel calcination-free desulfurized gypsum brick, belonging to the production field of building bricks. The calcination-free desulfurized gypsum brick comprises the following components in parts by weight: 45-55 parts of desulfurized gypsum, 25-35 parts of coal ash, 5-10 parts of No. 32.5 cement, 4-10 parts of triethanolamine, 3-5 parts of sodium …
Optimization design and characterization of slag …
Optimization design and characterization of slag cementitious composites containing carbide slag and desulfurized gypsum based on response surface methodology. ... The paste was cured at room temperature (20 ± 2 °C) for 24 h, then removed from mold and transferred to a standard curing room (20 ± 2 °C, 95% RH) for curing, and the mechanical ...
CN101549984A
The invention discloses a calcination-free desulfurized gypsum dry mixed mortar, pertaining to the production field of preblended dry mixed mortar used for building. The dry mixed mortar is produced by the following ingredients by weight proportion: 30-50 portions of desulfurized dehydrate gypsum; 10-15 portions of hydraulic cementing materials, 50-60 portions of …
Desulfurized-gypsum calcining device and method using …
A technology of desulfurized gypsum and calcining device, which is applied in chemical instruments and methods, separation methods, drying gas layout, etc., can solve the problems of low waste heat utilization efficiency and low gypsum calcination efficiency, and achieves the advantages of improving combustion efficiency and increasing heating area. Effect
Study of Desulfurized Gypsum Drying | Blog
The desulfurized gypsum from power plant flue gas is the largest resource of industrial by-product gypsum. By adopting advanced processes such as drying and calcination, it is applied in gypsum block production, developing new types of wall materials, and expanding the construction market. This represents a new approach to utilizing desulfurized gypsum …
CN110304852B
The invention relates to a method for whitening desulfurized gypsum, the obtained gypsum and application. The method for whitening the desulfurized gypsum comprises the following steps: (1) calcining the desulfurized gypsum; (2) mixing the calcined desulfurized gypsum-containing alkaline solution with a bleaching agent to obtain a pre-product; (3) and mixing the pre-product …
Method for preparing sulphoaluminate cement and co …
A technology of sulfoaluminate cement and desulfurization gypsum, applied in the direction of sulfur xide/sulfuric acid, etc., can solve the problems of high strength in the early stage, low utilization rate of desulfurization gypsum, and a large amount of limestone.
Production and resource utilization of flue gas desulfurized …
At present, due to the high decomposition temperature and complex composition of gypsum, only a small part of FGD gypsum is recycled; most of it is directly stored as solid …
Study on the influence mechanism of flue gas …
After calcination at 220 °C, anhydrous gypsum is the main component of desulphurisation gypsum. From the above results, it can be concluded that starting from 120 …
CN101549983A
The invention discloses a calcination-free desulfurized gypsum perfused dry mixed adhesive mortar, pertaining to the production field of adhesive mortar. The mortar is produced by the following ingredients by weight proportion: 15-25 portions of desulfurized dehydrate gypsum; 25-45 portions of hydraulic cementing materials, 40-60 portions of aggregate, 3-10 portions of …
CN116000500A
The application discloses the use of desulfurized gypsum. The modified desulfurized gypsum subjected to the thermal calcination treatment for removing the crystal water is applied to the hot-melt welding powder. The desulfurized gypsum can perform oxidation-reduction reaction with aluminum magnesium powder and the like at high temperature, and meanwhile, the …
Effect of Kal(So4)2 on the Morphology and Properties of Calcined Gypsum
By calcining the desulfurized gypsum with the addition of KAl(SO4)2, the calcined gypsum was obtained. The effects of calcination temperature and KAl(SO4)2 content on the properties of calcined gypsum were investigated, and the optimal calcination temperature and appropriate content of KAl(SO4)2 were determined.
Ball Mill_ Rotary Kiln_Henan Zhengzhou Mining Machinery …
Gypsum Rotary Dryer; Cement Rotary Dryer; Fly Ash Rotary Dryer; Other Equipment. ... HOT PRODUCTS. CONTACT US. E-mail： mic@zkcorp. Whatsapp：+86 . Send Message. Chat Now. Calcining equipment for desulfurized gypsum Date: 14:51 Author: ... 1.1 Airflow calcination equipment ...
CN102643107B
The perforated brick is mainly prepared from the following raw materials: 30-50 percent of calcination-free desulfurized gypsum, 10-30 percent of cinerite active material, 15-30 percent of ceramsite, 5-10 percent of sulfate exciting agent, 0.1-0.3 percent of retarder, 10-30 percent of coal cinder powder and 5-15 percent of ceramsite sand. ...
A method for preparing sulfoaluminate cement co …
A technology of sulfoaluminate cement and desulfurization gypsum, applied in the direction of sulfur xide/sulfuric acid, etc., can solve the problems of high strength in the early stage, low utilization rate of desulfurization gypsum, and a large amount of limestone.
Desulfurization gypsum used as a treatment process for building gypsum
The properties of dihydrate gypsum will continue to disappear with the increase of calcination time. The desulfurized gypsum is calcined for 1.5h After that, it can be converted into semi-hydrated gypsum. ... If the calcining temperature of desulfurized gypsum is at 185℃, 235℃ and 300℃, the main component of the calcined desulfurized ...
Effect of desulfurized gypsum whiskers on the adsorption …
The study investigated the impact of red mud / desulfurized gypsum whiskers mass ratio, coupling agent dosages and calcination temperature on the Pb(II) adsorption by desulfurized gypsum whiskers modified red mud ceramsites. The resulted optimum factor was …
High value-added utilization of desulfurized building …
calcination temperature of β -hemihydrate gypsum is signicantly lower than that of cement, usually within a range of 135–180°C, and it can be fully recycled (Lushnikova and Dvorkin 2016; Krejsova et al. ... In summary, desulfurized gypsum, an industrial by-product produced by ue gas desulfurization process, is the most practical engineering ...