| 摘要 |
Gelation and setting of desirably miscible and pumpable aqueous crutcher slurries comprising sodium bicarbonate, sodium silicate and sodium carbonate are retarded and often are prevented by the addition of sodium sesquicarbonate (which serves as a source of sodium carbonate and sodium bicarbonate) after admixing of sodium bicarbonate, sodium carbonate (if added earlier) and sodium silicate. Desirably, citric acid is dissolved in the crutcher medium before addition of the sodium sesquicarbonate but its presence is not necessary. The method of the invention appreciably increases workable crutcher time (stabilizes the mix against gelation) compared to prior methods of manufacturing similar crutcher mixes of similar contents of bicarbonate and carbonate (considering the sesquicarbonate of the present method as a source of carbonate and bicarbonate), whether all the carbonate and bicarbonate are separately added to the crutcher before the silicate or are added partially before and partially after silicate addition. The improved workability and stability of the crutcher mix permit the making of higher solids content crutcher slurries, thereby resulting in significant energy savings and increases in production rates when such slurries are subsequently spray dried to produce free flowing inorganic salt base beads, from which beads built or heavy duty detergent compositions may be made by post-spraying onto the base beads a nonionic synthetic organic detergent in liquid state.
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