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...

Examples

example 1

[0043] (1) Combine 7.50gNaOH and 7.50gNaOH 2 CO 3 with 15.00gH 2 O mix well and add to 100ml polytetrafluoroethylene liner, then add 10.00gK 2 Potassium feldspar powder with an O content of 8.61% passed through a 150-mesh sieve, stirred evenly, put it into an autoclave, and fixed it in a homogeneous stirring reactor (HZ-6), and the reactor was heated to 200°C, Start timing, stop heating after 4 hours of reaction, take out the lining after the reaction kettle is cooled, filter and wash the sample until the filter cake is free of CO 3 2- Afterwards, dry at 105°C for 2 hours. The obtained filtrate is a potassium-containing filtrate, that is, the potassium feldspar decomposition mother liquor, and the dissolution rate of potassium ions in the potassium feldspar is measured to be 95.33wt%.

[0044] (2) Pass CO into the potassium-containing filtrate in step (1) 2 Perform acidification to control SiO in the filtrate 3 2- The concentration is about 0.5mol / L, CO 2 The flow rat...

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...

Examples

example 1

[0043] (1) Combine 7.50gNaOH and 7.50gNaOH 2 CO 3 with 15.00gH 2 O mix well and add to 100ml polytetrafluoroethylene liner, then add 10.00gK 2 Potassium feldspar powder with an O content of 8.61% passed through a 150-mesh sieve, stirred evenly, put it into an autoclave, and fixed it in a homogeneous stirring reactor (HZ-6), and the reactor was heated to 200°C, Start timing, stop heating after 4 hours of reaction, take out the lining after the reaction kettle is cooled, filter and wash the sample until the filter cake is free of CO 3 2- Afterwards, dry at 105°C for 2 hours. The obtained filtrate is a potassium-containing filtrate, that is, the potassium feldspar decomposition mother liquor, and the dissolution rate of potassium ions in the potassium feldspar is measured to be 95.33wt%.

[0044] (2) Pass CO into the potassium-containing filtrate in step (1) 2 Perform acidification to control SiO in the filtrate 3 2- The concentration is about 0.5mol / L, CO 2 The flow rat...

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