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Dimensional Changes of Select Ceramic Materials Exposed to Hcl, Hno3, and H2so4 Acid Environments.

Bennett JP; Maginnis MA

MISSING :10 pages

10006264

The Bureau of Mines investigated the dimensional changes of ceramic materials exposed to acid environments to evaluate construction materials for emerging technology in chemical and metallurgical processes. Six commercial ceramic materials (two red shale, two fireclay, one silica, and one silicon carbide (sic) were exposed to h2o, 20 and 30 wt pct hcl, 40 and 60 wt pct hno3, and 10 and 50 wt pct h2so4 at temperatures from 50 deg. to 90 deg. C for 300 days. Linear expansions ranged from a low of -0.02 pct for the silica to a high of 0.45 pct for the red shale. A general ranking of the volume expansion of the materials tested (from high to low) is as follows: high-porosity red shale a and fireclay b >> low-porosity red shale b and fireclay a > silicon carbide and silica. A general ranking (largest to smallest) of the effect of exposure environments is hcl > h2so4, hno3 > h2o. An autoclave test method was evaluated. Data obtained from 8- to 24-h exposures were compared with data obtained from the 300-day exposures. The relative expansion trends were similar, indicating that this method could be used as an accelerated test.

19880101

IH; Report of Investigations;

1988

RI 9185

SRC;

MISSING