Novel method for comprehensively utilizing potassium feldspar

Abstract

The invention discloses a novel method for comprehensively utilizing potassium feldspar. According to the method, NaOH-Na2CO3 is used for being mixed with sub-molten salt to decompose the potassium feldspar, and potassium feldspar decomposing mother liquid and kankrinite are obtained; the potassium feldspar decomposing mother liquid is subjected to carbonatation and filtration to obtain filter liquid containing potassium bicarbonate and salic filtering slag; filtering liquid is subjected to evaporation, crystallization and drying, and potassium carbonate can be obtained; meanwhile, the salic filtering slag is subjected to supplementing addition of KOH, Al(OH)3 and H2O for regulating the mixture ratio of the K2O / SiO2, the Al2O3 / SiO2 and the H2O / SiO2; at a certain temperature, aging and crystallization are performed for a period of time; W molecular sieves are synthesized. The method has the characteristics that the decomposing temperature is low; the potassium ion dissolving rate is high; the decomposing mother liquid can be easily acidified; the product added value is high; the raw material utilization rate is high; no waste liquid and no waste slag are produced. The method conforms to the green production principle, and has good potential economic benefits.

Description

technical field [0001] The invention belongs to the technical field of mineral resource processing, preparation of inorganic metal compounds and aluminosilicate compound preparation technology, and specifically relates to the utilization of potassium feldspar and the preparation of potassium carbonate, cancryptite and W molecular sieve. Background technique [0002] my country's soluble potassium ore resources are poor, accounting for only about 0.4% of the world's total reserves. With the steady improvement of the level of economic development, the country's demand for water-soluble potassium salts is increasing year by year, and the production capacity and demand are far apart. my country is rich in non-water-soluble potassium resources, among which potassium feldspar mines are widely distributed in 23 provinces and regions, and the proven reserves reach tens of billion tons. [0003] Potassium feldspar (KAlSi 3 o 8 ) theoretically with K 2 O16.9%, SiO 2 64.7%, Al 2 o...

AI Technical Summary

Problems solved by technology

Generally speaking, the above method has two disadvantages: first, the reaction temperature of roasting and decomposing potassium feldspar is above 500°C, and the energy consumption of the process is relatively large; second, the method reported above is mainly aimed at synthesizing molecular sieves, and the Potassium dissolution rate requirements are not high, resulting in a waste of potassium resources to a certain extent

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