摘要:
The invention relates to a solidification and hardening accelerator for hydraulic binding agents, containing aluminium sulfate Al2(SO4)3, aluminium hydroxide Al(OH)3, and a mineral acid, in an aqueous solution. Preferably, said solidification and hardening accelerator contains between 10 and 50 % of aluminium sulfate Al2(SO4)3, between 5 and 30 % of aluminium hydroxide Al(OH)3, and between 0.5 and 10 % of a mineral acid, in an aqueous solution.
摘要:
The basic idea of the invention is not only to dispense with the cross-linking of the solid dispersed phase in the dispersing agent, but to use the solid dispersed phase as matrix of matrices into which macro-particles are incorporated. The dispersing agent is then chemically set, but an excess of setting agent is added, so that the preproduct may be transformed into the desired material by adding dispersing agent at a later date. For that purpose, a body capable of forming a matrix is prepared and formed with filler-like macro-particles, soloxide (cross-linking agent) and a buffer for promoting the formation of the matrix of matrices. This body is then processed. It may be pigmented, so that a great variety of different compositions may be obtained by adding a variant mixture to the body. Two successive steps allow the appropriately prepared body to be transformed into the desired material: a hydrating and balancing step and a subsequent setting and stabilising step.
摘要:
A composition for treating toxic metals in solid waste, sludge or slurry is provided. The composition includes a reducing agent such as ferrous sulfate or sodium sulfite and a fixative containing solid calcium oxide or solid magnesium oxide. The composition may also include an acid such as sulfuric acid.
摘要:
An aqueous aluminum phosphate solution, comprising component (i) mono aluminum tris(dihydrogen phosphate) and component (ii) a salt of a metal selected from the group consisting of alkali metals, alkaline earth metals and aluminum and mixtures thereof, and an acid at least as strong as phosphoric acid, with the proviso that if the said metal consists of aluminum, then said acid is stronger than phosphoric acid and (iii) phosphoric acid. The phosphate solution is used to react with a metal oxide curing agent in the presence of an aggregate to form a set cement.
摘要:
Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung von gezielt abbindenden wäßrigen Calciumsulfat-Halbhydrat- Suspensionen, indem man entweder Calciumsulfat-Halbhydrat mit Pyrophosphat und Chloriden dreiwertiger Metalle vermischt und mit Wasser anmaischt oder einer vorliegenden Calciumsulfat-Halbhydrat- Suspension Pyrophosphate und Chloride zumischt, dadurch das Abbinden der Calciumsulfat-Halbhydrat- Suspension unterbindet und man erst nach einer gewünschten Zeit das Abbinden des Calciumsulfat-Halbhydrates auslöst, indem man den pH-Wert des erhaltenen Gemisches durch Zugabe von Säuren erniedrigt.