摘要:
A raw material with a high content of aluminum oxide has the following composition, in weight-percent, based on dry weight: 1 Al2O3null50-80% MgOnullnull2-15% SiO2nullnull1-15% CaO0.5-20% Fe2O30.5-2% Na2O0.5-2% Al (metallic)0.1-2% AlN0.1-1% K2O0.1-1.5% F0.1-2% Cl0.1-0.8% balance in total, not to exceednull5% loss on ignition, not to exceed15% The main mineral constituents of the raw material are, in weight-percent 2 aluminum hydroxide20-60% corundum null-Al2O310-40% spinel MgAl2O4null5-40% Specifically, the aluminum hydroxide is present as aluminum mono-hydroxide Al2O3.H2O and aluminum tri-hydroxide Al2O3.3H2O in a weight ratio exceeding 0.25.
摘要:
Steel mill waste containing iron, iron oxides and polluting compounds are treated with a strong alkali to raise the Ph to 14 to allow more alkali to solubilize silica. The mixture of materials and silica gels is then reacted with alkaline silicic compounds and allowed to cure and form hard sedimentary rock-like materials, solidified into a non-polluting solid which can be recycled in a steel-making furnace to produce iron and non-polluting slag.
摘要:
The invention provides a binder composition comprising: (a) ground granulated blast furnace slag (GGBS), (b) basic oxygen slag (BOS), and (c) an alkaline inorganic waste material selected from by-pass dust (BPD), cement kiln dust (CKD), and mixtures thereof. The use of such a composition as a binder in a concrete mix, concrete mixes comprising such a composition, methods of manufacturing concrete articles, and concrete articles such as paving blocks are also provided.
摘要:
The present invention relates to a process for manufacturing a soil treatment composition, to soil treatment compositions and to the use of such compositions. The process according to the invention comprises a step of selecting one or more slags having a predetermined free lime content of greater than or equal to a first threshold value, a step (B1) of adding free lime to the slag or slags and a step of grinding the slag or slags in order to obtain a soil treatment composition having a predetermined free lime content of greater than or equal to a second value.
摘要:
A method of making a cementitious composition comprises (a) selecting at least one pozzolanic particulate material; (b) selecting and grinding at least one feldspar material to a fineness of at least 3000 Blaine; (c) mixing calcium oxide or calcium hydroxide with gypsum; (d) mixing the ground feldspar with the lime-gypsum mixture to produce an activator; (e) conditioning the pozzolanic particulate material with an aqueous solution; (f) adding the activator to the conditioned material to produce a slurry; and (g) curing the slurry in a sealed container. The pozzolanic particulate material can be slag, fly ash, or siliceous rock. A cementitious composition of the invention comprises a pozzolanic particulate material, a ground feldspar material, a lime compound and gypsum, and uses readily available materials, as an economic replacement for Portland cement, fly ash or other materials in filling, backfilling and paving, particularly for backfilling or stabilizing mine sites.
摘要:
The present invention relates to a process for manufacturing a soil treatment composition, to soil treatment compositions and to the use of such compositions. The process according to the invention comprises a step of selecting one or more slags having a predetermined free lime content of greater than or equal to a first threshold value, a step (B1) of adding free lime to the slag or slags and a step of grinding the slag or slags in order to obtain a soil treatment composition having a predetermined free lime content of greater than or equal to a second value.
摘要:
A process and apparatus by which blast-furnace slag can be added to the feedstock materials fed into the feed-end of a rotary cement kiln to form cement clinkers. The blast-furnace slag is crushed and screened to provide blast-furnace slag particles having particles with a predominant size of up to a maximum diameter of substantially 2" or less.
摘要:
The present invention provides settable compositions that comprise water and cement kiln dust. The settable compositions optionally may comprise an additive that comprises at least one of the following group: fly ash; shale; slag cement; zeolite; metakaolin; and combinations thereof. The settable compositions optionally may be foamed with a gas. Methods of cementing also are provided that comprise: providing the settable composition; introducing the settable composition into a location to be cemented; and allowing the settable composition to set therein. The location to be cemented may be above ground or in a subterranean formation.
摘要:
The present invention provides settable compositions that comprise water and cement kiln dust. The settable compositions optionally may comprise an additive that comprises at least one of the following group: fly ash; shale; slag cement; zeolite; metakaolin; and combinations thereof. The settable compositions optionally may be foamed with a gas. Methods of cementing also are provided that comprise: providing the settable composition; introducing the settable composition into a location to be cemented; and allowing the settable composition to set therein. The location to be cemented may be above ground or in a subterranean formation.
摘要:
A method for treating a raw steel plant slag to transform it into a hydraulic binder at least equivalent to a Portland cement clinker, comprises the following steps: oxidizing treatment with input of oxygen, air or a mixture thereof at a pressure ranging between 1 to 15 bars, at a temperature ranging between 1650 and 1400° C., of raw steel slag containing, relative to the raw slag total weight, at least 45 wt. % of CaO and less than 30 wt. % of Fe2O3; and adding to the slag a lime source optionally with silica and/or alumina, so that the slag, after tranformation and at room temperature, has a propotion of Fe2O3 of less than 13 wt. % and a mineralogical composition comprising at least 40 wt. % in C3S mineralogical phase and more than 10 wt. %, of calcium ferrite, relative to the final slag total weight.
摘要翻译:一种用于处理生钢厂渣以将其转化成至少与波特兰水泥熟料相当的水硬性粘合剂的方法包括以下步骤:在1至15的压力范围内输入氧气,空气或其混合物进行氧化处理 在1650〜1400℃的温度范围内,生钢渣相对于原渣总重量至少为45重量%。 CaO的%和小于30wt。 %的Fe 2 O 3 3%; 以及任选地用二氧化硅和/或氧化铝将石灰源添加到炉渣中,使得炉渣在转化和室温后具有Fe 2 O 3 O 3 小于13wt。 %和包含至少40wt。%的矿物组合物。 在C 3 S矿物相中的%,超过10wt。 %的铁素体相对于最终的炉渣总重量。