No. 1688, Gaoke East Road, Pudong new district, Shanghai, China.
No. 1688, Gaoke East Road, Pudong new district, Shanghai, China.
An apparatus for calcining gypsum including a housing having a bottom wall, open top, and a plurality of side walls extending therebetween. A fixture is located adjacent the open top for receiving gypsum from a source and transferring the gypsum into the housing. At least one burner is connected to the housing and operable for combusting an air-fuel mixture to heat the gypsum.
Method and apparatus for calcining gypsum in a kettle (10) in which the calcined mass is fluidized. Heat for the calcination is supplied by heating rods (46) which are immersed in said bed. Said heating rods (46) supply about 1 British Thermal Unit (Btu) of heat per minute per square inch of surface area of rod. Heat is also supplied to the calcined mass by a hot gas produced by …
An apparatus for calcining gypsum including a housing having a bottom wall, open top, and a plurality of side walls extending therebetween. A fixture is located adjacent the open top for receiving gypsum from a source and transferring the gypsum into the housing. At least one burner is connected to the housing and operable for combusting an air-fuel mixture to heat the …
FIG. 1 is a vertical section of a conventional gypsum calcining kettle modified in accordance with the present invention. FIG. 2 is a horizontal sectional view of a portion of the kettle of FIG. 1, taken on line 2--2 thereof. Referring to the drawings, there is shown a hollow cylindrical calcining kettle 10, including cylindrical sidewall 12 ...
In a kettle, the gypsum is heated indirectly by combustion gases passed through flues in the kettle and discharged into a pit below. In a flash calciner, it contacts hot gases directly and the …
The housing can be constructed and arranged to receive and process gypsum-based products. An agitator frame (64) having a similarly shaped cross-section to the cross-section of the …
U.S. Patent Nos. 5,743,954 and 5,927,968 disclose a method and apparatus for the continuous calcining of gypsum material in a refractoryless kettle preferably heated by a multiple series of separate immersion tube coils, each coil operating within …
In kettle calciners, gypsum is heated outwardly by hot gases passing through flues. Such indirect heating ensures a constant temperature; overburning and contamination of gypsum with combustion products are avoided. ... Another effective method for synthetic gypsum calcining is the use of a horizontal impact calciner. It provides calcination of ...
The old calcining plant from the early 1970s was based on Russian kettle calcining technology with a heavy fuel oil hot gas generator and electrostatic filter. To fulfil …
A gypsum calcining apparatus 10 includes a housing with an open top, a bottom wall 52 and side walls extending from the bottom to the top, a fixture 104 at the top to receive the raw gypsum into the housing, a support floor near the bottom wall to hold the gypsum in the housing, a burner 22 connected to the housing to combust an air/fuel mixture 24, 26 and a serpentine burner …
The key component of this system is the calcining plant where Claudius Peters supply a range of calcining systems customised for each application. A Claudius Peters EM Mill is at the heart of a gypsum processing system combining the functions of grinding drying calcining and classifying the gypsum in one unit.
The old calcining plant from the early 1970s was based on Russian kettle calcining technology with a heavy fuel oil hot gas generator and electrostatic filter. ... To enable plaster production in Koshava, the plant is equipped with an innovative Claudius Peters Gypsum Calcining System using a ball ring type mill and a new homogeniser. The EM ...
the sum of the roller mill and kettle calciner output rates. k References 4-5,11,13-14. Emission factors based on the kettle and the hot pit do not apply to batch kettle calciners. mReferences 3,6,10. n References 3,6,9. p References 9,15. As used here, an impact mill is a process unit used to dry, grind, and calcine gypsum simultaneously. q ...
Calcination of Gypsum was an accidental discovery as were its rehydration characteristics. Ancient man probably used lumps of Gypsum to enclose his fire. Some degree …
We deliver medium to large-scale engineering projects for clients in the agricultural, recycling, waste recovery and renewables sectors.
A vessel is mounted above a furnace, and is used for retaining gypsum as it is calcined to prepare it for making wallboard or plaster. A feed of crushed gypsum supplies the vessel-kettle regulated by the temperature required to calcine gypsum. Calcined gypsum flows from the kettle while maintaining a predetermined level of gypsum in the kettle.
THETECHNOLOGYOFTHEMANUFACTUREOF GYPSUMPRODUCTS* ABSTRACT In1904thevalueofcrudeandcalcinedgypsumproducedintheUnitedStates was$2,750,000,withatonnageoflessthan1,000,000 ...
Gypsum is further pulverized for feed into a calcining kettle or flash calciner. For most of the last 100 years, the most commonly used mill for reducing gypsum to a fine powder has been the Raymond mill.
Use of such forced aeration within a calcining kettle helps the gypsum material 42 flow better within the kettle. This gives more assurance that there are no so-called "heating dead spots" within the kettle. This modification would be particularly helpful with material fluidity in those areas in kettle 22 where the burner tubes straight ...
The preparation of natural and synthetic gypsum prior to calcination, such as drying and grinding. The various calcination methods for β-hemihydrate and α-hemihydrate are reviewed, such as …
a Pfeiffer GK gypsum calcining kettle. In this process, the natural gypsum is first fed to a Pfeiffer MPS mill where the material is dried and simultaneously ground to the required fineness for …
The calcining is typically performed in a container conventionally referred to as a calcining kettle, in which ground gypsum can be held during the calcining. Calcination occurs at approximately 250° F. to 325° F. (120° C. to 162° C.), and 1 ton (0.908 megagrams (Mg)) of gypsum calcines to about 0.85 ton (0.77 Mg) of stucco. ...
The addition of CaO can broaden the temperature range for calcining FGD gypsum into β-HH. In addition, with the increase of CaO addition, the quality of the converted β-HH is better. The high-performance building gypsum can be prepared by calcining the FGD gypsum with 3–5 wt% of CaO addition at 160–220 °C for 1.5–2 h.
Calcining of gypsum comprises converting calcium sulfate dihydrate by heating itinto calcium sulfate hemihydrate, better known as stucco. Prior calcining apparatus and methods have taken various forms. Traditionally, the calcining of gypsum has occurred in a large kettle, having a thickened dome-shaped bottom, against which a gas-fired flame is ...
5 Schematic diagram of the kettle – the introduced heat is very uniformly distributed. GPSE. GPSE. Tab 1 The specific thermal energy requirement is about 20 % higher than when the gypsum is calcined directly in the gypsum …
A method and apparatus is disclosed for the continuous calcining of gypsum material in a high-efficiency, refractoryless kettle preferably heated by a multiple series of separate immersion tube burner coils, each coil operating within a specific calcining zone inside the kettle. The lowest, i.e., initial, burner tube coil is formed with a low profile to permit use of a …
Gypsum is commonly found in sedimentary rock formations. It's extracted from open-pit mines or underground mines using large drills and blasting with explosives. The way gypsum is mined depends on the hardness of the gypsum and the size and depth of the deposit. ... The resultant plaster mixture is pumped into a plaster calcining kettle where ...
A calcining kettle includes a cylindrical housing having a hot air chamber at one end, a dust collecting chamber at an opposite end and a calcining chamber between the hot air chamber and the dust collecting chamber, at least one air pad disposed between the hot air chamber and the calcining chamber, each air pad being supported by air pad supports for passage of hot air …
Referring to FIG. 1, an improved apparatus, generally 10, for calcining gypsum, also referred to herein as a calcining kettle, includes a housing, generally designated 12. The housing 12 includes a cylindrical wall 14 and two ends, namely, a bottom end 16 and an open top end 18.
