| 摘要 |
A process for producing potassium silicate fertilizer soluble in citric acid comprises kneading a mixture consisting essentially of potassium carbonate, fly ash, pulverized coal, other necessary starting materials and a potassium hydroxide solution and then granulating the kneaded mixture, drying the granulated product to a nearly absolutely dry state, and calcining the dried granular product, whereby a chemical reaction takes place between potassium and the silicon present in fly ash to convert them into potassium silicate soluble in citric acid. Apparatus for performing the foregoing process comprises a plurality of continuous quantitative feeders (1a to 1f) a continuous kneader (2), an extruder (3) for forming granules, a fluid drier (4), a fluid calcining furnace (6), and a cooler (8) for cooling the calcined product <IMAGE> |
