摘要:
A method for producing a porous ceramic article, which involves a step of kneading raw materials including a raw material for a ceramic and a processing aid, to prepare a body, a step of forming the body, to prepare a ceramic formed product, a step of drying the formed product, to prepare a ceramic dried article, and a step of firing the ceramic dried article, to preparing a porous ceramic article, characterized in that the processing aid is a starch having been subjected to a croslinking treatment or a material comprising a starch having been subjected to a croslinking treatment and an expanded resin. The method allows the production of a porous ceramic article which is suppressed in the deformation during drying and is excellent in dimensional accuracy.
摘要:
L'invention concerne principalement un procédé de préparation de granulats d'argile expansée comprenant les étapes de : a) granulation d'un mélange d'argile comprenant au moins 10 % en poids en matière sèche de boues organominérales et une quantité appropriée d'eau ; b) séchage du granulat obtenu ; et c) cuisson du granulat à une température appropriée pour assurer l'expansion de l'argile.
摘要:
The invention concerns a process for the production of aggregates starting from clay and from waste waters, dusts and/or muds deriving from the purification of industrial and/or civil wastes. According to said process, the waste waters, dusts and/or muds are mixed in ratios from 1 to 70% by volume with clay (from 99% to 30% by volume), the mixture is homogenized in the most uniform possible way, and then treated at high temperature in a rotary furnace. A foamed or not foamed aggregate is obtained which gives positive results to all washout tests, not only in the granular form but also after breaking or grinding. If the initial wastes contain metals, particular antipollution advantages are obtained.
摘要:
A method for producing a porous ceramic article involves a step of kneading raw materials including a raw material for a ceramic and a processing aid, to prepare a body, a step of forming the body, to prepare a ceramic formed product, a step of drying the formed product, to prepare a ceramic dried article, and a step of firing the ceramic dried article, to preparing a porous ceramic article, characterized in that the processing aid is a starch having been subjected to a crosslinking treatment or a material comprising a starch having been subjected to a crosslinking treatment and a foamed resin. The method allows the production of a porous ceramic article which is suppressed in the deformation during drying and is excellent in dimensional accuracy.
摘要:
The use of waste enamel, coagulated enamel or solid materials tarnished with waste enamel from enamelling installations is disclosed as components for the production of fired ceramic materials with improved heat insulation and/or improved mechanical properties. The amount of waste enamel, coagulated enamel or solid materials tarnished with waste enamel equals 0.1 to 30 % by weight of the mixture of non-fired ceramic materials. Also disclosed is a fired ceramic material produced by using such waste enamel.
摘要:
The present invention provides an improved process for treating effluents from yolky wool scouring processes, characterised by comprising the following four stages in the order given:
a) a first stage of flocculation/precipitation of the flocculable/precipitable contaminants and separation of the liquid phase from the solid phase, which consists of purification sludge; b) a stage of anaerobic treatment; c) a second stage of flocculation/precipitation and separation; and d) final aerobic treatment.