EVALUATION OF GRANULATION PARAMETERS OF PULTERED FRACTION OF POTASSIUM CHLORIDE IN THE PRESENCE OF LIGNOSULFONATE ADDITIVE
Abstract
The problem of processing and disposal of the pulverized fraction of flotation potassium chloride formed at the stage of dehydration of the finished product in fluidized bed furnaces is quite acute. A high content of small particles of KCl with a diameter of less than 0.25 mm significantly worsens the consumer characteristics of the finished product, leads to an increase in caking and dustiness of the mineral fertilizer. Studies of the process of granulation of the pulverized fraction of KCl using a technical lignosulfonate solution as a binder were presented in the article. The effect of binder consumption, pelleting time, temperature of the granulation and drying process on the static strength and fractional composition of the granulated product was evaluated. It was shown that the maximum share of the commercial fraction with a granule size of 0.7 ÷ 5 mm is formed using a 20% solution of technical lignosulfonate, added in the amount of a 12% additive to the total mass of the granulated mixture. At the same time, the average static strength of the product turned out to be 63% higher than that of potassium chloride granules obtained with a 12% addition of water. It was found that the maximum strength of the granulate was formed during a 3-min treatment of the initial mixture of cyclone dust and a binder in a drum granulator at a temperature of 90 °C. The optimal time and temperature parameters for drying the granular product were determined, which contribute to the formation of its high strength characteristics without oxidation of the binder additive. It has been established that the process of dehydrating granules at a temperature of 150 °C for 30 min allows achieving extreme strength of the product. The transition to the drying temperature range of 200-300 °C leads to an increase in the porosity of the granules, deformation of the crystalline bridges formed during the granulation of cyclone dust, oxidation of the binder and, as a result, loss of strength of the target product.
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