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. ...
The original desulfurization gypsum featured rhombic blocks as its main morphological characteristic and long and thick plates. After the calcination under 180 °C for …
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 ...
Key takeaway: 'The electric hearting fluidized bed effectively converts desulfurized gypsum into calcined gypsum, producing -type half-water calcium sulfate with satisfactory quality, meeting the technique index for architecture gypsum.' ... Experimental Research on Desulfurized Gypsum Calcination in Fluidized Bed. Yang Hairui. 2006. Cite ...
The invention provides a control system of natural gas for calcining desulfurized gypsum. The control system comprises a hot air formed by combustion of natural gas as a heat source, wherein the heat source comprises a flow controller for controlling flow of natural gas and air quantity; a drying and crushing device is a sealing chamber; the outlet of the drying and crushing device is ...
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 …
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 …
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.
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
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 …
In addition, the calcination temperature of β-hemihydrate gypsum is signi cantly lower than that of cement, usually within a range of 135–180°C, and it can be fully recycled (Lushnikova and …
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 ...
CN106145848A CN201510257522.4A CN201510257522A CN106145848A CN 106145848 A CN106145848 A CN 106145848A CN 201510257522 A CN201510257522 A CN 201510257522A CN 106145848 A CN106145848 A CN 106145848A Authority CN China Prior art keywords calcination desulfurized gypsum building mortar free desulfurized concrete Prior art date …
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 ...
The invention discloses a desulfurized gypsum calcination apparatus which comprises a hot gas source device, a gypsum conveying device, a calcination device and a tail gas absorption device, wherein the hot gas source device is connected with the inlet end of the calcination device through a first pipeline; the outlet end of the calcination device is connected with the …
The calcination temperature rises to 180 °C, 2 h flexural and compressive strength are respectively up to 2.6 and 4.3 MPa, conforming to the grade 2.0 requirements of building …
The results revealed that the maximum Cr (VI) removal rate of 99% can be obtained in the ceramsite with weight ratio bamboo to bentonite of 6:4, the annealing …
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 …
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 …
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 ...
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. The calcination process of desulfurized gypsum Date: 14:37 Author:ZK Corp. Views: 1. Low temperature slow calcination ...
The proper calcination equipment and processing technology should be used to produce FGD gypsum for different purposes. For the production of gypsum building materials such as various gypsum plasterboards and aerated blocks, rapid calcination equipment should be used, that is, the calcination method in which the temperature of raw materials is ...
The present invention relates to steam calcination kiln technical fields, and a kind of both ends are disclosed into vapour, the desulfurized gypsum steam calcination kiln of three layers of steam pipe network, including pedestal, mounting base is fixedly connected at the top of the pedestal, motor is fixedly connected at the top of the mounting base, rotating bar is fixedly …
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 …
In addition, the 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 ...
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 ...
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
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