6. The process of calcining gypsum which comprises heating a mass of finely ground gypsum in a kettle to a temperature sufficient to convert said gypsum to calcium sulfate hemihydrate, maintaining a substantially continuous supply of gypsum being fed to said kettle, allowing a substantially continuous flow of calcined gypsum at the top of said …

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 a specific calcining zone inside the kettle.

the gypsum industry Single-stage calcining in the gypsum kettle Fine natural gypsum, mixtures of natural gypsum and FGD gypsum, as well as FGD gypsum are dried and calcined in the Pfeiffer gypsum kettle which can be run continuously or batchwise. Normally the kettle is followed by a grinding-separating plant comprising high-speed

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1. Apparatus for continuously calcining finely ground gypsum comprising a gypsum calcining kettle, means for heating material in said kettle, inlet means for con-tinuously feeding said gypsum to said kettle, and an overflow discharge opening directly from the interior through the sidewall of said kettle in the upper half thereof, said inlet means for …

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.

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 …

n Tailor-made gypsum calcining systems n Natural gypsum & synthetic gypsum n Post-calcining treatment n Stucco handling and packaging n Raw material preparation 3. Maintenance-free ... Claudius Peters Kettle Calciner systems, in combination with the Claudius Peters mills are characterized by their homogeneous product qualities – …

Our lab kettle is an 80 L electrically heated calciner that produces stucco at a rate of 10 kg/ hour. The calcination is controlled by a thermocouple within the stucco bed that changes …

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.

 — 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 …

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 calcining mill. GPSE. GPSE. 6 The crystal water content is reduced by a rising exhaust gas temperature. GPSE. GPSE.

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 …

Grinding and calcining of gypsum with Pfeiffer grinding plants. For the production of plaster products natural gypsum, synthetic gypsum or a mixture of both are calcined. Depending on the production process two …

The U.S. Department of Energy's Office of Scientific and Technical Information

 — 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.

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 ...

 — 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 ...

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 ...

GB1165717A - Gypsum Calcining Kettle and method - Google Patents Gypsum Calcining Kettle and method Info Publication number GB1165717A ... kettle conduit gypsum nov discharging Prior art date 1965-11-15 Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no ...

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 plaster. Subsequently, the ground and dried gyp-sum is delivered to the gypsum kettle ( Fig. 3). The kettle filled with finely ground gypsum is

 — Grenzebach provides a wide range of calcining processes for optimally coordinated further processing of gypsum. From directly to indirectly heated long-time or short-time calcining systems, Grenzebach covers all processes used in the gypsum …

 — Grenzebach has supplied flash calcining systems for natural gypsum, utilizing roller mills with simultaneous grinding and calcining. Stucco produced in a gypsum kettle …

the present invention is an improved kettle for the calcination of gypsum which comprises a vessel of generally cylindrical form having a bottom and a side wall of heat conducting material, walls defining a heating chamber surrounding the bottom and side wall of said vessel, a substantially vertical conduit communicating at its lower end with the interior of …

new and useful Kettle for Calcining Gypsum, of which the following is a specification. My invention relates to a kettle for calcin ing gypsum by means of artificial heat, The objects of my invention are, first, to convert the raw gypsum into calcined gypsum Or stucco by a continuous drying process, the raw material being continually fed to the ket

 — According to Lippard (1949), a gypsum kettle consists of a cylindrical steel shell with a rounded bottom, which contains some kind of mechanically operated stirring device on the inside, and is heated from the bottom. Diameters range from 8 to 15 feet, and depths from 6 to 14 feet. ... Calcining in gypsum kettles is a batch process. Ground ...

MPS vertical roller mill and the first gypsum kettle to the gypsum industry. The first whizzer-type classifier, SUV, followed 10 years later. In 1998, the MPS-GC roller mill for drying, grinding and calcination in one step was introduced (Figure 1). Up to now, 26 gypsum calcining mills have been sold, among them

FIG. 1 is a perspective view, partially broken away, of a gypsum calcining kettle showing one embodiment of the present invention. FIG. 2 is a flow diagram illustrating the heat flow through the embodiment shown in FIG. 1. FIG. 3 is a horizontal sectional view taken at the line 3 -- 3 of FIG. 1, looking in the direction of the arrows. ...

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 …

 — 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. ...