Abstract
In this preliminary investigation, the production of liquid fertilizer from rock phosphate and dolomite in Nigeria using the nitrophosphate is evaluated. Rock phosphate was obtained from Sokoto state, Nigeria. Dolomite was obtained from Edo state, Nigeria. This work contains a detailed description of the procedure and the associated chemical reactions. There are also important explanations of some physical observations and their possible implications in a large scale process. The time frame for each batch should not exceed 1 h considering the reaction rates and the temperatures are likely not to exceed 80oC at any point in the process. It was observed that the potassium, phosphorus and nitrogen content of both fertilizers are similar but the calcium content of the product from dolomite was higher than the other products. Furthermore, possible process design modifications based on these physical observations are proposed in line with product quality, safety, cost and other considerations. The process was ultimately successful and recommendations were made based on several aspects of the process.
Highlights
Due to the increasing global population, the use of fertilizers is gaining more popularity as the demand for food keeps rising [1]
Chemical compositionof the fertilizer The chemical compositions of ions of Calcium, Potassium, Phosphorus and Nitrogen in the liquid fertilizer produced is given in Table 1 part per million of the solvent
It can be observed that the potassium, phosphorus and nitrogen content of both fertilizers are similar
Summary
Materials All reagents used in this study were of analytical grade. Rock phosphate was obtained from Sokoto state, Nigeria. Implementing some form of cooling at this stage (preferably taking it down to about 25oC) will have 3 major advantages It will speed of the rate of the rock dissolution as lower temperatures favour exothermic reactions. It will prevent the degradation of the nitric acid (and release of harmful NOx gases) due to the high temperature thereby making the process safer for operators. The solution was cooled to 0oC in a deep freezer and the crystallisation of the salts was achieved, the obtained crystals were filtered out The filtration for this case was much more rapid when compared to that of the rock phosphate process. Just as in the rock phosphate process, the acidic solution was neutralized using liquid ammonia. The effluent quality of wastewater treatment was monitored for several months
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