摘要:
A process for significantly improving the physical and catalytic properties of faujasite containing fluid cracking catalysts (FCC) employing a sol binder by incorporating acid stable surfactants into the catalyst component streams prior to spray drying.
摘要:
The present invention disclosed a magnesia clinker excellent in corrosion resistance, which is useful for a magnesia carbon refractory and also for a refractory for steel manufacturing furnace, and the magnesia clinker is characterized by:(a) having a purity of MgO of 97 wt. % or higher;(b) containing 2.0 wt. % or less of CaO;(c) containing 0.01 wt. % or more of B.sub.2 O.sub.3 ;(d) containing 0.3 wt. % or less of SiO.sub.2 ;(e) containing impurities other than MgO, CaO, B.sub.2 O.sub.3 and SiO.sub.2 of 2 wt. % or less;(f) having a bulk density of 3.35 (g/cc) or higher and an apparent porosity of 3.0 (vol. %) or less; and(g) having a mean crystal size of magnesia of 100 .mu.m or larger.
摘要:
The invention relates to a process for the production of sintered magnesite from magnesium hydroxide in which filter cake is size reduced in a stream of hot air to a certain particle size, after which the material is heated and calcined and the dehydrated powder thus obtained is hot briquetted and introduced hot into the sintering zone. This process is distinguished by its high economy on heat and by the production of a readily sinterable dehydrated powder.
摘要:
A method for improving the density and other properties of caustic magnesia and sintered periclase. To improve the density of sintered periclase, acid or acid salt is admixed with magnesium hydroxide, followed by caustic-firing, pressing and high-firing. If desired, the admixture is dried before caustic-firing. Alternatively, the step of caustic-firing may be omitted. To improve the density and compactability of caustic magnesia, acid or acid salt is admixed with magnesium hydroxide, followed by caustic-firing. If desired, the admixture is dried before caustic-firing. Preferably, acetic acid is used.
摘要:
This invention relates to stable, fluid magnesium-containing dispersions and the preparations thereof by the high temperature dehydration of Mg(OH).sub.2 to MgO in a dispersant-containing fluid.
摘要:
A process for removing boron contaminant from magnesium halide-containing brine wherein the brine is contacted with active magnesia to precipitate boron-containing magnesium hydrate and to remove at least 50%, and up to at least 95%, by weight of the total boron content of the untreated brine, without reduction of the magnesium halide content of said brine. The active magnesia is employed in an amount of from about 0.1% to about 10% by weight, preferably from about 2% to about 6% by weight, of the untreated brine, which may be heated e.g., from about 140.degree. F to the boiling point thereof, prior to contact with said active magnesia. Subsequently, the treated brine can be used, by reacting it with dolime, to form magnesium hydroxide which, in turn, can be calcined to produce MgO, each of which is a high-purity-low-boron product, i.e., less than 150 ppm boron on an oxide basis, and preferably less than 75 ppm. In addition, the MgO will contain less than 1.5% CaO and can contain, under proper processing conditions, less than 0.8% CaO impurity.
摘要:
A process for making magnesia wherein a sludge of magnesium hydroxide is simultaneously dewatered and compacted to give a cake of magnesium hydroxide containing at least 67.5% by weight of solids and having a green bulk density of at least 1.15 grams/cc and wherein the cake thereby obtained is converted by a suitable heat treatment into magnesium oxide.Refractory products produced from the magnesia of the invention are also described.
摘要:
Caustic magnesia and magnesium hydroxide slurry are mixed together with sufficient energy in a counter-current high energy mixer to form pellets of various sizes during hydration of the caustic magnesia. The pellets may be used as formed or may be calcined to caustic magnesia or deadburned in a kiln to refractory periclase.
摘要:
The device comprises a plurality of thin elastic strips distributed at equal angular intervals on a circle centered on the axis of the component. The large surface of the strips is positioned in the plane tangential to the circle parallel to the axis of the component, each of said strips having a tightly securing connection to the support (or the component) and a universal connection to the component (or the support). The device is particularly useful for fixing a component of an optical system in a satellite.