| Potassium is a very important resource and the soluble potassium ore is relatively lack in our country.Therefore, it is important to develop limited potassium with reasonable, and effective utilization. Big Wave Beach locate in the West Qaidam Basin, It is consisted of a number of small salt lake,and it has rich potassium resources and depositing rock salt resources.But the quality of potassium resources is not very high, so it is particular important to extract limited potassium resources by using reasonable technology.The solar pond effect of the Tibetan plateau is extremely obvious.At the same time,we can use the solar pond to get high-temperature brine,and the solubility of potash increases with increasing temperature.So we can use the solar pond to enrich potassium. In order to develop this feature of the solar pond, we try to combine it with the existing potash production. Big Wave Beach of Qinghai has abundant resources of low-grade potash. For this reason, This study want to combination the use of low-grade potash with Potash-riching of the solar pond. And we have carried out related basic research.It contained soluble potassium-rich mineral law, the evaporating and precipitation mineral (potassium) law of dissolved mineral brine, potassium salt mix at high temperature law, crystallization law study of rich potassium solution etc. According this, we propose a technique scheme of solar pond rich potassium,.The results are as follows:(a)In the study of soluble potassium-rich mineral law, for low grade potassium ore of Big Wave Beach,we have used the water, saturated brine, saturated Glauber’s salt solution, intergranular brine solvent to study dissolution equilibrium and dissolution kinetics experiments. We explore the concentration of each component with the dissolution and the dissolution rate with the change in the amount of solvent. In the dynamic leaching process monitoring,we explore the each component variation with time. We determined the optimum solvent to extract low-grade potash and best amount of solvent(b) In the experience of evaporating and precipitation mineral (potassium) law of dissolved mineral brine, we determined the rate of evaporation when the potash began to precipitate. Whe the evaporation rate close to 0.39, brine can enter the solar pond to evaporate in the solar pool surface,a nd to determine the precipitation of sylvite.(c)In the experience of potassium salt mix at high temperature law, we explore the solubility of potassium mixed salt. Finally, we think that it is feasible to let the potassium saturated solution which do not precipitate potassium as the thermosol solution at the bottom of thesolar pond.(d) In the study of crystallization law study of rich potassium solution, we explored the change of the ion concentration in solution during the cooling process.When the raw material is the hot brine of potassium saturation,it has a good effect of crystallization during cooling after hot melt. Potassium-rich liquid mainly precipitate potassium salt in cooling process.Potassium cooling mother liquor can be continued as solar pond feeding of saturated liquid at room temperature.(e) In the study of the distribution characteristics of temperature-concentration-density in potassium-rich solar pood,we indicate that the brine of Da lang tan can be used as a solar pond(f) According to the experiment, we propose the dual cycle technology solutions of the production of potassium based on the solar pond... |
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