Phase Equilibrium Diagram Of Water-soluble Fertilizer Containing Three Trace Elements And Its Applications

This paper introduced the development of water-soluble fertilizers and the research progress of water-salt phase diagram, studied the phase diagrams of Mn-Cu,Zn-Mn, Zn-Mn-Cu water-salt system, a new method to prepare trace elements water-soluble fertilizers by combining water-salt phase diagram and soil-testing fertilizer, investigated the effects of Mn-Cu, Zn-Mn and Zn-Mn-Cu trace elements water-soluble fertilizers on crops, the design and industrialization of 300 tons/year of trace elements water-soluble fertilizers were studied.By adopting isothermal dissolution equilibrium method, researched the phase equilibrium of MnSO₄-CUSO₄-H₂O?ZnSO₄-MnSO₄-H₂O?ZnSO₄-MnSO₄-CuSO₄-H₂O system under 0 ??10 ??25 °??pH=2 and pH=3, and drawn phase diagrams of MnSO₄-CuSO₄-H₂O and ZnSO₄-MnSO₄-H₂O by Origin software, and drawn phase diagrams of ZnSO₄-MnSO₄-CuSO₄-H₂O by Matlab software. By comparing the phase diagram of MnSO₄-CuSO₄-H₂O and ZnSO₄-MnSO₄-H₂O at different temperatures under the same pH,the saturated solubility of ZnSO₄·H₂O?MnSO₄·H₂O and CuSO₄·5H₂O increased with the increase of temperature; by comparing the phase diagram of MnSO₄-CuSO₄-H₂O and ZnSO₄-MnSO₄-H₂O at different pH under the same temperatures,the saturated solubility of ZnSO₄·H₂o and CuSO₄·H₂O increased with the increase of pH, however the saturated solubility of MnSO₄·H₂O decreased with the increase of pH.According to the phase diagrams of MnSO₄-CuSO₄-H₂O?ZnSO₄-MnSO₄-H₂O?ZnSO₄-MnSO₄-CuSO₄-H₂O under different temperatures?pH and trace elements water-soluble fertilizer agriculture industry standard technical indicators, obtained Mn-Cu?Zn-Mn?Zn-Mn-Cu trace elements water-soluble fertilizer formulations areas of different temperatures and pH; when the temperature is 10 degrees, formulated Mn-Cu, Zn-Mn trace elements water-soluble fertilizer with good storage properties.Through example analysis, the combination of soil-testing and manure compounding with Mn-Cu?Zn-Mn and Zn-Mn-Cu water-soluble fertilizers could provide the theoretical basis for the preparation of trace element water-soluble fertilizers.Studied the effect of Mn-Cu and Zn-Mn trace element water-soluble fertilizers on maize by hydroponics, the result shows: compared with CK, the Mn-Cu and Zn-Mn trace element water-soluble fertilizers could increase plant height, increase shoot fresh weight and root fresh weight, and decrease root length of maize. Foliar spraying Zn-Mn-Cu trace elements water-soluble fertilizer, corn growing well, dark green leaves, plant growth robust, compared with the water control, the yield per acre was 13.1%; compared with the CK, the yield per acre was 13%, 135.5 yuan per mu of new income, economic efficiency was significant.The technical scheme and production scheme of 300 tons/year of trace element water-soluble fertilizer process design and industrialization project were discussed,and the environmental impact and economic benefit of the project were analyzed.