Potash feldspar deep processing
Potassium feldspar is a feldspar mineral, is a potassium-rich silicate minerals. Feldspar extremely stable chemical structure, the melting temperature of 1100-1200 deg.] C, melted at longer intervals, with a strong co-soluble, melt to form a glass state at a high temperature material having transparent characteristics, it is widely used in glass, Ceramic industry. However, the use of K-feldspar is far more than this. In this article, we will introduce you to the further processing of K-feldspar.
1, potassium feldspar made potassium fertilizer
It is well known that potassium is an important element in the growth of crops. China's potassium resources are abundant , and soluble potassium resources are very scarce. Since the beginning of the 1960s, China has started to use potassium feldspar to prepare potassium fertilizer. It has carried out dozens of technological studies, which can be divided into: sintering method, high temperature melting method, hydrothermal method, blast furnace smelting method. And low temperature decomposition method.
2, potassium feldspar purification
In recent years, with the development of glass and ceramics industry, improving people's living standards, more and more products gentrification, more and more demand for high-purity potassium feldspar amount of low iron, high-quality potassium feldspar trend was in short supply. K-feldspar rich domestic resources, but excessive iron content, therefore, is the key to K-feldspar in addition to iron purification. Iron is a magnetic object, and potassium feldspar is a non-magnetic substance that is easily separated in a magnetic field.
Now generally used: potassium feldspar raw material - hand selection - crushing - grinding - grading - dehydration - finished product process iron removal, the process is suitable for low iron content, good quality raw materials . The jaw crusher is used for coarse crushing and fine crushing. In order to prevent the pollution of iron to potassium feldspar during processing, it is easy to use a turbine, a gravel mill or a porcelain ball mill as a grinding equipment when selecting grinding equipment , and adopting spiral classification. The machine guarantees the granularity of the product. The process is simple and the investment is small. The disadvantage of this process is that the iron content index of the product is difficult to meet the requirements of high quality ceramic products. In order to overcome the shortcomings of the process and increase the magnetic separation process, it has been proved that the wet selection process of the wet high gradient magnetic separator is good. The iron removal efficiency reaches 70%-90%.
3, potassium feldspar fire retardant calcium silicate board
Calcium silicate board manufactured using feldspar, its principle is a good raw material slurry, to scale (potassium feldspar: Lime: Fiber = 229: 91: 80) uniformly mixed slurry prepared using the headbox system board The slab is made into a slab, and the slab is stacked and sent to an autoclave. The high temperature and high pressure steam is used to maintain the calcium oxide in the aluminum and lime in the material to form hydrated calcium silicate under high temperature hydrothermal reaction. Calcium silicate crystalline mineral, cemented with fibers to form a whole. Potassium feldspar powder for producing calcium silicate board, a good way to use local resources, to reduce production costs.
4, using potassium feldspar to make potassium fertilizer while making carbon black
Potassium feldspar contains 13.6% potassium. It is economically unreasonable to extract only potassium, because potassium feldspar minerals have not been fully utilized, which has been proved in practice. For the characteristics of the remaining mineral stone after potassium extraction, comprehensive research is carried out. Preparation of white carbon principle is based on the structure of K-feldspar have been destroyed after extracting potassium, and then, at a certain temperature and the reaction water glass NaOH, diluted with water while adding an appropriate amount of electrolyte, and neutralized with an acid and constant temperature After aging, it is filtered and washed to obtain white carbon black.
I would like to remind you that from the past experience, the economic benefits of simply extracting potassium from potassium are not significant. Only by combining local resources, the comprehensive utilization of potassium feldspar can have broader development prospects.
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