Ignition, loss

The best indirect, but seldom used, method is to determine the total moisture separately in a Penfteld tube, determine the loss on ignition in air at 825—875°C, and report graphitic carbon as percent loss on ignition (100 — %moisture — %ash). It is desirable to use a platinum dish for ignition loss and it... 

Concentrations (in ng/g Ignition Loss) of Several PBDEs in Sediment and Suspended Particulate Samples... 

Friability is of interest primarily because friable coals yield smaller proportions of the coarse sizes that may (depending on use) be more desirable, and there may also be an increased amount of surface in the friable coals. This surface allows more rapid oxidation hence, conditions are more favorable for spontaneous ignition, loss in coking quality in coking coals, and other changes that accompany oxidation. These economic aspects of the friability of coal have provided the incentive toward development of laboratory friability tests. 

Powers and Brownyard (P20) called the water lost from the C S-H on passing from the saturated to the D-dry condition gel water . It comprises part of the pore water plus an arbitrarily defined fraction of the interlayer water. Whatever procedure is used to dry or equilibrate a paste, COj-free conditions are essential, and the amount of water retained can be obtained accurately only if the ignition loss and COj content are also determined. Calculations based on the initial w/s ratio are often unreliable due to changes in the water content during curing. 

This dilemma can be resolved partly by treating the minerals with hydrochloric acid. Carbonates dissolve, whereas silica and combustible matter do not. But the presence of bitumen and even vegetal matter interferes more or less with the reaction with hydrochloric acid, so the cleanest way to carry out acid treatment is on ignition residues. The ratio of acid solubles to ignition loss will then be below 56 44 in proportion to the amount of combustibles present. But because some common minerals dissolve in hydrochloric acid whereas other do not, the conventional method of mineral analysis is approximate at best. 

Ignition loss Tab 2.2.2 Result of Evaluation of Synthesized Zeolite ... 

Figure 2. Variation of ignition loss of residue and decomposition ratio of com bustibles with loading rate of dried cake...

Ignition loss Net specific gravity Bulk specific gravity Mean particle size pH value 1.83% 2.51 0.53 18.1 yu 9.83 [-]... 

The ignition loss of the pyrolytic ash and the slag and their volumetric reduction ratio are shown in Table V. The tabulated figures show that in the slag solubility-test, the quantities of individual harmful substances liberated are all below the control limits which are set in Japan for land reclaiming work. 

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