Reaction with calcium hydroxide

The reaction with calcium hydroxide is rather slow, so agitation should go on for some time (5-15 min). The mixture is then allowed to remain at rest for clarification. Treatment with milk of lime neutralized the acids and caused the precipitation of several coloured compounds, among others the products of the reaction of trinitrotoluene with calcium hydroxide. The amount of calcium oxide consumed in the process is 700 tons monthly, at an output of 4000 tons of TNT a month. 

DOT CLASSIFICATION 5.1 Label Oxidi2er SAFETY PROFILE Poison by intravenous route. Moderately toxic by ingestion. An experimental teratogen. Experimental reproductive effects. Mutation data reported. Ingestion of large quantities may cause gastroenteritis. Chronic exposure can cause anemia, nephritis, and methemoglobinemia. When heated, reaction with calcium hydroxide + polychlorinated phenols forms extremely toxic chlorinated benzodioxins. 

EXPLOSION and FIRE CONCERNS flammable liquid NFPA rating Health 1, Flammability 3, Reactivity 1 very dangerous fire hazard containers may explode in fire vapor may explode if ignited in enclosed area flashback along vapor trail may occur violent reaction with calcium hydroxide, hydrocarbons, hydroxides, and inorganic bases may ignite on contact... 

According to Jawed et al. [35] the elongation of induction period is the function of calcium ions concentration growth until the required supersaturation in relation to Ca(OH)2 is reached. The zinc hydroxide reaction with calcium hydroxide leads to the formation of complex hydroxyanion the latter is further precipitated as a calcium salt poorly soluble. As a consequence the concentrations of OH" and Ca ions decrease and the hydration is retarded. 

Precaution Oxidizer explosive and violent reactions possible when heated, reaction with calcium hydroxide + polychlorinated phenols forms highly toxic chlorinated benzodioxins Hazardous Decomp. Prods. Heated to decomp., emits very toxic fumes NOx, K2O HMIS Health 1, Flammability 0, Reactivity 3 Storage Store R.T. 

In the system Portland cement-fly ash-water the initial hydration of the clinker phases, especially those of tricalcium silicate and tricalcium aluminate, progresses much faster than that of the ash. Just as in the hydration of pure Portland cement, a C-S-H phase, ettringite, and calcium hydroxide are formed as the first hydration products. Any alkali sulfate salts, commonly present in the clinker, also dissolve and convert to alkaU hydroxides and calcium sulfate in a reaction with calcium hydroxide. The alkalinity of the liquid phase increases, and may exceed pH=13. 

The texture of cement pastes containing microsilica is characterized by the presence of agglomerates of individual microsilica particles. Such agglomerates are present even when a superplasticizer has been added to the mix (Mitchell et al., 1998), but in smaller numbers. Within these agglomerates a reaction with calcium hydroxide and formation of the C-SH phase also occurs, but the rate of this process is significantly reduced, especially in the central part, and the reaction is not completed even after 180 days. 

Carbonization of concrete caused by the penetration of carbon dioxide into concrete leads initially to the formation of calcium carbonate as a result of reaction with calcium hydroxide, and then to calcium hydrogen carbonate, which is washed out by rain water from concrete capillaries. A decrease of the pH of the concrete environment to 8-8.5 is the result and it causes destruction... 

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