Batch precipitation of alkaline earth carbonates. Effect of reaction conditions on the filterability of resulting suspensions

Crystallization of calcium carbonate accompanying chemical absorption

“…An, Bn = constants used in eq 9 and 15 c = correction factor for noncontinuous effects L = granular bed length, m Pn = nth-order Legendre polynomial Re = Reynolds number St = Stokes number 170 = superficial/face gas velocity, m s'1 a = bed granule radius, m l = unit-cell radius, m rt0 = inlet concentration of fine particles, m~3 r, d = polar coordinates rp = fine particle radius, m t = time, s u = local gas velocity, m s_1 ur, U) = radial and tangential components of local gas velocity, m s_1 v = fine particle velocity, m s"1 v" vs = radial and tangential components fine particle velocity, The gas-liquid reaction which produces a sparingly soluble material is an important process in the chemical, electronic, and metallugical industries. Well-known examples of its large-scale use include wet gas desulfurization, the production of calcium carbonate as a rubber filler, and ferrite production by the goethite method-The control of crystal size and shape is important for the subsequent separation process (Sohnel and Matejckova, 1981) and the quality of the product. It is probable, though it has not been confirmed experimentally, that the rate of gas absorption influences, and is influenced by, the habit of crystals produced by the gas-liquid reaction.…”

Design of solids processes: production of potash

“…However, there has been a growing interest in the integration between crystallization and sedimentation/ filtration in the production of inorganic compounds (Sohnel and Matejckova, 1981;Jones, 1985) and between feed preparation, reaction, and solid-liquid separation for coal li-* To whom correspondence should be addressed. input information batch versus continuous process input-output structure of the flow sheet recycle structure of the flow sheet separation system general structure vapor recovery system liquid separation system solids recovery system energy integration evaluation of process alternatives quefaction processes (Leu and Tiller, 1984).…”