Driving And Dissolving Exploitation Of Low-grade Solid Potassium Research In Qarhan Salt Lake

Sylvite is the raw material of agricultural potash. China is a large agriculturalcountry, but the dependence on foreign potash was as high as70%or more. Thepotash shortage has become a bottleneck that restricting the development of China’sagricultural factor.Some research(Wang Shijun,1995) suggest that solid potassium in Qarhan saltlake have been dissolved into liquid brine due to the devastating floods of1989.Natural low-grade solid potash liquefied into the brine proved that it is possible toconvert solid potassium to liquid potassium. The same time, the previous series oftheoretical studies(Li Wenpeng,1991) and laboratory experiments studies(Sun Dapeng,1995; Hao Aibing,1997; Hao Aibing,2003) confirmed solid potassium ore is solubleThe author choosed Bieletan Area as the main study area and carried out2experiments in june,2007to september,2007and November,2011to March,2012respectively. The experiment area is about1km2, and the experiment last for3to4months.This paper introduces geological conditions in Qarhan Salt Lake and overview oftwo field tests. The paper analysed the monitoring data in the experiment and studiedthe change of hydrodynamic field and hydro-chemical field in the process ofdissolving and driving. This paper also compares the similarities and differences ofthe two experiments. Study shows that,50meters away from complement drains,intergranular brine flow has become horizontal.Studies shows that, within a certaindepth, the ion concentrations are same in different depth in the driving and dissolvingprocess. The same disstance to the drain, the same ion concentrations. The dissolvingand driving process in the field experiment conform to Li Wenpeng’s (Li Wenpeng,1991) and Hao Aibing’s (Hao Aibing,1997) stage in their doctoral thesis, but somedifferences also exists. Halite, sylvite, carnallite activity product in solvent is low,afterthe solvent goes into the formation, the formation of dissolved minerals, the activityof three minerals elevated. The hydraulic gradient improved in the driving and dissolving process, so the karst streams become more apparent. Liquefied stratapotassium levels were significantly lower average grade of0.47percent lower,dissolved minerals rate of21.9%The extended-range driving and dissolving modecan effectively improve the intergranular brine water level. The field tests confirmedthat the Seniehu lake is very effictive as solvent to dissolve solid mineral.