摘要:
An insulation panel, particularly for fire-resistant doors, comprises mineral wool fibres and particles comprising calcium sulphate, notably having an average diameter of at least 5 mm.
摘要:
The present invention relates to a gypsum plasterboard, comprising a first outer layer, preferably paper layer (111), a first intermediate layer (112) formed by a second gypsum slurry S 2 , a core layer (113) formed by a first gypsum slurry S 1 a second intermediate layer (114) formed by third gypsum slurry S 3 and a second outer layer, in particular paper layer (115), wherein the first intermediate layer (112) is arranged between the first outer layer (111) and the core layer (113), and the second intermediate layer (114) is arranged between the second outer layer (115) and the core layer (113), wherein the intermediate layers (112, 114) have a (substantially) constant thickness from 0.1 mm and 3 mm, preferably from 0.2 mm to 1 mm, wherein the first gypsum slurry comprises at least 80% (by weight) of all gypsum slurries (S 1 , S 2 , S 3 ) : and wherein the first gypsum slurry is prepared and introduced with a lower water percentage (by weight) than the second S 2 and/or third S 3 gypsum slurry.
摘要:
The invention relates to a process for producing building elements (1) made of gypsum, which comprises the following steps: preparing a mixture containing a quantity of gypsum particles and a quantity of free water; feeding said mixture to a compression mould; compressing the mixture in the compression mould at a final pressure of between 20 and 60 MPa, a compressed mass being obtained in the process; and unmoulding the compressed mass, characterized in that: the quantity of free water in the mixture is essentially uniformly distributed and amounts to from 1 to 8% by weight, based on the dry solids of the mixture, and in that the step of the compressed mass being unmoulded is followed by the step of the compressed mass being allowed to set. The invention also relates to a building element consisting of compressed gypsum, fabricated by means of said process.
摘要:
The present invention relates to a method for producing a gypsum plasterboard comprising the steps of: Providing a first slurry (11) of a particular type of gypsum by use of a first mixer (10); providing a second slurry (13) of the particular type of gypsum by use of a separate second mixer (12); depositing a first part (22) of the second slurry (13) such that a lower layer of the second slurry (13) is formed; depositing a second part (23) of the second slurry (13) such that an upper layer of the second slurry (13) is formed; depositing at least a part of the first slurry (11) onto the lower and/or upper layer such that a core layer of the first slurry is formed between the lower and upper layer.
摘要:
A method of producing a nonfoamed formed article of a vinyl chloride resin by mixing a hydrated water-containing gypsum powder and a vinyl chloride resin powder together, and heating the obtained mixture at a temperature lower than a temperature at which the vinyl chloride resin starts decomposing thereby to remove the hydrated water of the gypsum and to form the mixture. The method makes it possible to obtain a nonfoamed formed article free of defective appearance by directly adding the hydrated gypsum (specifically dihydrate gypsum) to the vinyl chloride resin without converting it to the anhydrous gypsum, without requiring wasteful energy cost, without causing foaming or defective forming stemming from the hydrated water and maintaining stability.
摘要:
A process for neutralising exhausted sulphuric acid by means of production of di-hydrated calcium sulphate that provides the feeding of sulphuric acid (1) and of a soluble calcium salt (2) in a precipitator (3) for the precipitation of di-hydrated calcium sulphate, which is filtrated in a decantation plant (4), washed (5) and then dried (6,7,8). In the precipitator (4) a liquid acid phase and metal salts in solution remain. The calcium salt (2) can be obtained in a reactor (10) by a ion exchange reaction between a calcium ore (11) based on calcium carbonate and an exchanging acid that is stored (9) downstream the precipitator (3, 4) as liquid phase separated from the calcium sulphate (6) obtaining carbon dioxide (12). In a reactor (13) calcium hydroxide is added (14), whereby the metal hydroxides precipitate and decant in the plant (15). The calcium salt in solution is then stored in the starting reservoir (2). The di-hydrated calcium sulphate has acicular crystals of high quality, whereas the metal hydroxides can be calcinated and with the metal oxides resulting therefrom brick material can be obtained for the building industry.
摘要:
Die Komposition zur Herstellung von Gipserzeugnissen enthält als Gipskomponente gipshaltige Abfälle und außerdem Kalk und Wasser bei folgendem Vernhältnis der Komponenten (Masse%):
Die Komposition zur Herstellung von Gipserzeugnissen enthält ein Gipsbindemittel, Kalk, Wasser und Zusätze, und zwar Kaliumaluminiumalaun, Eisenvitriol, Mineralpigment, tierischen Leim, die zusammen zugesetzt werden, oder durch Kunstkautschuklatex oder durch ein wasserlösliches Polymerisationsharz modifzierte Glasfasern und Kaliumnatriumtartrat bei folgendem Verhältnis der Komponenten (Masse%):