MANUFACTURING OF LIQUID COMPOUND FERTILIZERS FROM WASTE POTASSIUM DIHYDROGEN PHOSPHATE PRODUCTION
In the production of many products in various industries, especially chemical, the positive aspect is the creation and use of a waste-free technology. It has been found that the content of a liquid phase after interaction between NH4H2PO4 and KCl (the molar ratio of the starting materials was 0.8 : 0.2) depends on the conversion temperatures. The chemical composition of the liquid phase can vary from 1.19 to 1.45 % of N, from 14.96 to 26.55 % of K2O, from 1.06 to 2.55 % of P2O5 and from 13.42 to 13.71 % of Cl. The other properties of the solutions, such as pH, density and viscosity, are almost independent of temperature and meet the requirements for liquid compound fertilizers. This means that it is possible to produce a liquid fertilizer 4–5–15 grade in the post-crystallization of potassium dihydrogen phosphate remaining solution (when the molar ratio of the starting materials is 0.8 : 0.2) by adding 6 % of CO(NH2)2 wherein the crystallization temperature is 15 °C. It has been discovered that the liquid fertilizers 4–5–15 grade are efficient and give a bigger yield of plants. It increased the test plate dry weight by 78.2 %, the ash content by 41.6 % and the height of the plants by 31.2 %.