"The reserves of potassium feldspar in China are at least 20 billion tons or more, and the conversion of potassium oxide to at least 2.4 billion tons. If potash feldspar is used to make potash fertilizer, it will rewrite the history of China's long-term dependency on potash fertilizer imports." Mineral materials at China University of Geosciences at the weekend Professor Ma Hongwen, director of the National Professional Laboratory, said in an interview with reporters that the potassium feldspar hydrothermal alkaline process developed by them to produce potassium sulphate can efficiently and cleanly use potassium feldspar resources to produce potash fertilizer products. It is estimated that this process can reduce the cost of potash by about one-third compared to the existing process using salt lake potassium chloride as a raw material and using the Mannheim process to produce potassium sulfate. According to Professor Ma Hongwen's analysis, if the technology is promoted throughout the country, large-scale and efficient use of water-insoluble potash resources to form new potash fertilizer capacity, with an average potassium oxide ore content of 12.0%, potassium oxide recovery rate of 85% is estimated , the annual development and utilization of about 30 million tons of water-insoluble potassium ore, to meet the demand for all potassium oxide consumption. By then, the consumption of potassium chloride as a chemical raw material can be reduced by 5.258 million tons, making up for 57.2% of China's potash shortage in 2020, and reducing the external dependence of potassium fertilizer (salt) to 20% or less. Prof. Ma Hongwen introduced that the process can decompose potassium feldspar at relatively low temperatures and convert all of the potassium feldspar ore into potassium sulphate, calcium silicate and kaolin, and realize the elimination of “three wastes†emissions at the same time. The production of potash fertilizer from non-water-soluble potash resources has the disadvantages of large pollution, high energy consumption, and low effective potassium oxide content in the product. In addition, the technology has strong applicability. “The K-feldspar mine in Luonan County, Shangluo City, Shaanxi Province is a typical example. The successful application of this technology means that other K-feldspar mines are also suitable. Only the process parameters can be adjusted at that time, and its main product is still Potassium sulphate is only slightly different from the by-products,†said Professor Ma Hongwen. It is understood that the laboratory implemented the National Science and Technology Support Program Project - New High-Efficiency Fertilizer Innovation Process, taking K-feldspar as a sample from Luonan County to study the comprehensive utilization technology of potash from K-feldspar, and innovating the development of potassium feldspar hydrothermal Alkaline production of potassium sulfate process, and in June 2011 to determine the final process and product solutions. The appraisal expert review organized by the Ministry of Education believes that this technology for the efficient use of water-insoluble potash resources has no precedent at home and abroad and has completely independent intellectual property rights, which has reached the international advanced level. At present, the industrialization project of comprehensive utilization of potash feldspar has been started in Luonan County. The Shaanxi Daqin Potash Industry Co., Ltd. responsible for the implementation of the project is conducting a pilot test of 40,000 tons of potash feldspar mines, and will invest RMB 1.2 billion in industrialization. Production and construction of a project that will treat 1.2 million tons of potash feldspar or potassium sulfate production capacity of 300,000 tons.
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