| Abstract [eng] |
A compound fertilizer with boron was granulated employing laboratory equipment. As a boron component, boric acid and sodium tetraborate were used. Compound fertilizers of grade 14–18–18–6(S)–0,3(B) were obtained. The main physicochemical properties of the granulated products were determined. The optimal conditions of a compound fertilizer with boron granulation were determined as 7% humidity of the raw materials′ mixture, 65–85 °C of granulators, as well as acidified water used for irrigation. In these conditions, 14–18–18–6(S)– 0,3(B) commercial grade fertilizer fraction was obtained (approximately 30 percent, grain strength 40–46 N / gran). Analysis of the stability of the 14–18–18–6(S)–0,3(B) fertilizer grade showed that by heating at a temperature of 150 ºC material degradation started, and evaporation of ammonia and nitrogen losses were considerable. This process could be slowed down by a slight acidification of raw materials. The characteristics of the granulated product depended on the acidification solution quantity, granulation temperature and did not depend on any component of boron. |
