Method for synthesizing 4A-type molecular sieve by utilizing aluminum-silicon tailings obtained in process of carrying out potassium extraction on potassium feldspar

A technology of potassium feldspar and molecular sieve, applied in the field of synthesizing 4A type molecular sieve, can solve the problems of limited source of raw materials, high production cost and high price, and achieve the effect of improving comprehensive utilization rate and increasing product added value.

Inactive Publication Date: 2012-07-18
CHINA UNIV OF GEOSCIENCES (BEIJING)
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Problems solved by technology

The quality of products using this method is stable, but the source of raw ma...

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  • Method for synthesizing 4A-type molecular sieve by utilizing aluminum-silicon tailings obtained in process of carrying out potassium extraction on potassium feldspar
  • Method for synthesizing 4A-type molecular sieve by utilizing aluminum-silicon tailings obtained in process of carrying out potassium extraction on potassium feldspar
  • Method for synthesizing 4A-type molecular sieve by utilizing aluminum-silicon tailings obtained in process of carrying out potassium extraction on potassium feldspar

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Embodiment

[0018] Table 1 Chemical composition analysis results of potassium-feldspar extraction potassium-aluminum-silicon tailings w B %

[0019]

[0020] Weigh 100g of potassium-aluminum-silicon tailings extracted from potassium feldspar (see Table 1 for chemical composition analysis results), 1103g of NaOH solution with a concentration of 2.57mol / L, mix the two evenly and stir for 1h at 25°C; The mixed material is placed in a hydrothermal crystallization reaction kettle, crystallized at 90-100°C for 4 hours, filtered after the crystallization reaction is completed; the filter cake is washed with distilled water until the pH value is 9-10; after drying, the 4A molecular sieve product is obtained . The calcium ion exchange capacity of the 4A type molecular sieve prepared by this method is 315mg CaCO 3 / g anhydrous 4A molecular sieve, which meets the quality requirements of 4A molecular sieve for detergents stipulated in the light industry standard QB / T1768-2003. The X-ray powder ...

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Abstract

The invention relates to a method for synthesizing a 4A-type molecular sieve by utilizing aluminum-silicon tailings obtained in the process of carrying out potassium extraction on potassium feldspar. The method comprises the following steps: uniformly mixing the residual aluminum-silicon tailings obtained in the process of carrying out potassium extraction on potassium feldspar and 2 to 5mol/L of NaOH solution according to a certain ratio and stirring for 1 to 3 hours under the condition of a temperature of 24 DEG C to 26 DEG C; then carrying out hydrothermal crystallization on the mixed materials for 3 to 6 hours under the condition of a temperature of 90 to 100 DEG C and filtering after the crystallization reaction is finished; washing a filter cake to the pH value of 9 to 10 by distilled water; and drying to obtain the 4A-type molecular sieve. According to the invention, the residual aluminum-silicon tailings obtained in the process of carrying out potassium extraction on potassium feldspar replaces conventional chemical raw materials and the raw material cost is obviously reduced; the synthesis process is simple; the synthesized 4A-type molecular sieve has calcium ion exchange capacity of over 310mg; and the CaCO3/g anhydrous 4A-type molecular sieve accords with the requirements of the 4A-type molecular sieve for a detergent, which are regulated by the light industry standard QB/T1768-2003. An effective approach is provided for efficiently and comprehensively utilizing the potassium feldspar resources by the process.

Description

technical field [0001] The invention relates to a method for synthesizing 4A molecular sieves by using potassium feldspar to extract potassium, aluminum and silicon tailings. Background technique [0002] 4A molecular sieve is an important inorganic microporous material with high efficiency, selective adsorption, catalytic and ion exchange properties, and is widely used in detergent, petrochemical, pharmaceutical and environmental protection industries. The method for preparing 4A-type molecular sieves in the existing industry is to use sodium silicate, aluminum hydroxide, and sodium hydroxide as raw materials and adopt hydrothermal synthesis. The product quality of adopting this method is stable, but the source of raw material is limited, and price is more expensive, thus production cost is higher. [0003] Potassium feldspar extraction of potassium, aluminum and silicon tailings is to use potassium feldspar powder, and through pretreatment to prepare kalpheline powder (in...

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Application Information

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IPC IPC(8): C01B39/14
Inventor 苏双青马鸿文蔡比亚
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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