Übersetzung für "Lime hydrate" in Deutsch

This shows that clays or mixtures of clay and lime hydrate can absorb gaseous mercury compounds.

As sulfur acceptors limestone, burnt lime, lime hydrate and dolomite may, for instance, be used.

As already stated, the quicklime may be completely or partially replaced by hydrate of lime and the hydrate of lime may be completely or partially replaced by quicklime.

The present invention relates more particularly to a process for making calcium carbide by reacting an excess of coke with quicklime in the presence of oxygen in an oxygen-thermal furnace, which comprises: using precrushed coal as a starting material for coke and precrushed lime hydrate (Ca(OH)2) or precrushed limestone (CaCO3) as a starting material for quicklime; mixing the precrushed materials, introducing the resulting mixture into a drying zone and freeing it therein at 80° to 120° C. from adhering water; introducing the warm mixture coming from the drying zone, and air, into a calcining apparatus the coal constituent being coked and the lime constituent being simultaneously dehydrated or decarbonized therein at temperatures of 900° to 1400° C.; directly delivering the thermally pretreated mixture of starting materials with an inherent temperature of 900° to 1000° C. to the oxygen-thermal furnace; and reacting it with oxygen to produce calcium carbide therein.

In the process described in DE-PS No. 18 08 541 for the work up of waste water having phosphorus sludge contained therein, lime hydrate is added to the waste water so as to establish a pH-value of 4 to 6.

In a process for reduction of pollutant emissions during thermal processes, particularly sintering processes, in which a combustible mixture, particularly a coke bed, is ignited, the fuel-containing mixture, particularly the coke is rolled with Ca(oH)2 or impregnated with a lime hydrate sludge before feeding the fuel-containing mixture.

To solve this task, the invention basically consists of the fact that the porous fuel portion, particularly the coke, of the mixture before feeding the fuel-containing mixture is rolled with Ca(OH)2 or impregnated with a lime hydrate sludge.

The process of rolling the porous fuel portion with Ca(OH)2, particularly the coke, of the mixture before feeding the fuel-containing mixture or of impregnating it with a lime hydrate sludge did not suggest itself at all since the prejudgment of the technical world was that this type of addition to porous fuel portions, particularly coke, has a sensitive influence on the ignition temperature and particularly results in an increase in the ignition temperature.

It has proven to be particularly advantageous if before rolling and/or before treatment with the lime hydrate sludge, the sinter coke to be used is dried, whereby temperatures around 100° C. appear particularly suitable as drying temperatures.

Each of the mixtures produced in examples 1 to 5 of coke and lime sludge and/or coke and lime hydrate as well as a test sample consisting of 1000 g untreated coke were subjected to the following procedure.

A sample quantity of the coke mixed with lime sludge and/or lime hydrate was placed in a retort and heated in a rotary oven with forced air having a heating rate of approx. 5° C./min.

In FIG. 1, the percent of sulfur binding is represented on the ordinate and on the abscissa, arranged next to each other, the results of the three incineration tests executed with untreated coke and with the sinter coke fine treated with lime hydrate.

Quicklime (CaO), lime hydrate (Ca(OH)2) or more preferably granulated phosphorus furnace slag which essentially consists of calcium metasilicate can successfully be used as agents for precipitating gypsum.

Particularly high sulfur binding values in the ashes could be achieved during incineration of the mixture of coke fine and dry lime hydrate produced according to Example 5.

By impregnating the sinter coke with milk of lime and/or rolling same with lime hydrate, an optimum distribution of the sulfide-with the sulfur in the fuel.

Numerous additives can be added to the base material which is especially lime hydrate or fine white lime or to the water used for slaking the unslaked lime. Such additives include especially powdered clay, burnt clay, bentonites, thixotropic bentonites with a high montmorillonite content, gas concrete dust, expanded clay, ground fines from production of limestone bricks or production of yalistone (translated from the German "yalisteinherstellung"), powdered trass, trass lime, bleaching earths, cements, calcium aluminates, sodium aluminates, calcium sulfide, organic sulfides, calcium sulfite, carbonaceous sorbents such as blast furnace coke, lignite dust, activated carbon and ground or untreated flue ash from burning hard coal as well as water glass and accelerators and/or retarders of hydraulic setup such as those conventionally used in the cement industry (for example, such pore-forming substances as Addiment LP1 and LP2, foaming agents 1 TM and 4 TM or retarder VZ).

These reagents and compositions are mixtures of lime hydrate and/or calcium hydroxide with one or more additives and are characterized by an especially large specific surface area and/or an especially small particle size.

For example, it has been found that when activated carbon alone is added to lime hydrate, for example, binding of mercury is improved, but then substantial levels of mercury are found in the eluates of the residues.

This is achieved by a process for manufacturing calcium hydrosilicate bound fiberboard. In particular, the present invention includes a process for making double-deck board, in which a fiber-binder-filler mixture (having a water content of 40 to 45% by weight and a solids content of 55 to 60% by weight) is prepared by digesting cellulose fibers in an amount of from 2 to 12% by weight of the solids content with water and mixing them with fillers and with a binder that includes cement and/or lime hydrate and substances containing reactive calcium silicates to form a thick pasty mixture.

In the course of the process, the binder cement, for example Portland, iron Portland or blast furnace cement, reacts (through its lime content, or the free lime used as lime hydrate) with reactive calcium silicate during autoclaving to form strength-producing CsH phases.

German Auslegeschrift No. 1,142,442 discloses a process for briquetting fine ores, in which the ore is mixed with a basic aggregate, such as magnesium hydrate, lime hydrate, limestone or dolomite, and the mixture, without a special binder having been added and in the absence of clay, is briquetted under a high pressure.