China drying wire Reuters Qinghai Salt Lake Industry Co., Ltd. announced the end of June, the world's first 100,000 tons / year of hot-melt process potash production plant put into operation, the first trial production of about 30,000 tons of potassium chloride products have been put into the market. This indicates that the hot-melt process for producing high-quality potassium chloride from low-grade ore has matured, and the utilization rate of potassium resources in salt lake has been greatly improved. At present, Salt Lake has a world-class level of anti-flotation - cold crystallization process, with the halogen process, positive flotation process and hot-melt process technology, has formed a high, medium and low-end four kinds of production technology, which anti-floating The cooling-crystallization process is the mainstream and its production capacity accounts for about 85%.
According to Zhu Jinyi, the person in charge of the hot melt process, the process can convert low-grade ore into potash salt as a raw material for the production of potassium chloride by the hot-melt process without dissolving any chemicals. With the same low-grade raw ore as raw material, the potassium chloride grade produced by the hot-dissolving process is 5 to 7 percentage points higher than that of the positive flotation process, reaching about 98%, with a grain size of 0.4 mm or more, and a beneficiation recovery rate of 95 % or more (more than 60% for other processes), and the economic benefits increase significantly. At the same time, the process can also use tailings that are not available to the company's existing processes. In addition, the device is very energy-efficient in design, and can achieve energy-saving benefits of tens of millions of yuan per year only in the utilization of waste heat and recycling of production waste water.
In 2007, Salt Lake Co., Ltd. resumed the research on the hot-melt process technology from the perspective of the sustainable exploitation and utilization of potassium resources and effectively utilized the technology research agenda. It established a 10,000-ton/year experimental workshop at Sanyuan Company and started the process amplification in 2009. , to build 100,000 tons / year hot solution device.
Due to the difference in the quality of the brine in the Salt Lake mining area, the potassium content of the carnallite raw ore produced varies from high to low. There are high quality ore mines with high grades (about 22% potassium chloride and less than 1.5% calcium sulfate) and low levels. Grade ore (potassium chloride content around 7%, calcium sulfate content greater than 5%). From the beginning of this century, Salt Lake Co., Ltd. will supply high-quality raw ore mainly to the reverse flotation-cold crystallization process plant, producing more than 98% of high-end products. A considerable amount of low-grade ore is supplied to a positive flotation device, producing a low-end product with a taste of about 90%. In addition, each year, at the corner of Yantian, there will be four or five million tons of low-potassium (KCl content less than 5%) and high-grade calcium (more than 5% of the content of calcium sulfate) inferior raw ore, which is limited by the production process. In the past few decades, they were basically treated as salt or paved roads or abandoned mining areas, and even polluted the mining environment.
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