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Method for synthesizing P type zeolite from kaolin

A technology of kaolin and zeolite, which is applied in the field of synthesizing P-type zeolite from kaolin, can solve the problem of low synthesis process cost and achieve the effects of low quality requirements, good product quality and low energy consumption

Inactive Publication Date: 2013-03-13
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide the synthetic cost that can obviously reduce P-type zeolite, improve product quality, can realize and do not add silicon source and only use kaolin as raw material, overcome the high energy consumption in the traditional process and need to add silicon source, and the product contains quartz, Shortcomings such as mica and other mineral impurities, the cost of raw materials and synthesis processes used are low, and the obtained product has a method for synthesizing P-type zeolite from kaolin with good calcium ion exchange capacity.

Method used

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  • Method for synthesizing P type zeolite from kaolin
  • Method for synthesizing P type zeolite from kaolin

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Take 3g of kaolin and mix it with 16ml of 4mol / L sodium hydroxide solution and put it into an autoclave. The high-pressure reactor was kept at 240°C for 3 hours and then cooled naturally to obtain activated kaolin. Then, the activated kaolin was dissolved in 100 ml of hydrochloric acid with a concentration of 1.2 mol / L, stirred and reacted for 0.5 h, and then filtered to obtain a kaolin acid hydrolysis solution. Use NaOH to adjust the pH of the kaolin acid solution to 10 to obtain active silicon-aluminum raw materials, mix it with 50 mL of NaOH solution with a concentration of 1 mol / L, and put it into a high-pressure reactor. After the high-pressure reactor was kept at 90° C. for 48 hours, it was washed and filtered to obtain P-type zeolite. Its calcium ion exchange capacity is 211mg CaCO 3 / g, the whiteness is 91.

Embodiment 2

[0023] Take 3g of kaolin and mix it with 16ml of 5mol / L sodium hydroxide solution and put it into the autoclave. The high-pressure reactor was kept at 190°C for 9 hours, and then cooled naturally to obtain activated kaolin. Then, the activated kaolin was dissolved in 40 ml of hydrochloric acid with a concentration of 3 mol / L, stirred and reacted for 0.5 h, and then filtered to obtain a kaolin acid hydrolysis solution. Use NaOH to adjust the pH of the kaolin acid hydrolysis solution to 3 to obtain active silicon-alumina raw materials, mix it with 50 mL of NaOH solution with a concentration of 1 mol / L, and put it into a high-pressure reactor. After the high-pressure reactor was kept at 90° C. for 48 hours, it was washed and filtered to obtain P-type zeolite. Its calcium ion exchange capacity is 280mg CaCO 3 / g, the whiteness is 69.

Embodiment 3

[0025] Take 3g of kaolin and mix it with 16ml of 6mol / L sodium hydroxide solution and put it into the autoclave. The high-pressure reactor was kept at 160°C for 24 hours and then cooled naturally to obtain activated kaolin. Then, the activated kaolin was dissolved in 30 ml of hydrochloric acid with a concentration of 4 mol / L, stirred and reacted for 0.5 h, and then filtered to obtain a kaolin acid hydrolysis solution. Use NaOH to adjust the pH of the kaolin acid hydrolysis solution to 14 to obtain active silicon-aluminum raw materials, mix it with 80 mL of NaOH solution with a concentration of 0.67 mol / L, and put it into an autoclave. After the high-pressure reactor was kept at 90° C. for 72 hours, it was washed and filtered to obtain P-type zeolite. Its calcium ion exchange capacity is 261mg CaCO 3 / g, the whiteness is 90.

[0026] The X-ray diffraction spectrum of the embodiment of the present invention synthesizes P-type zeolite see figure 1 , the scanning electron micr...

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Abstract

The invention provides a method for synthesizing a P type zeolite from kaolin, and relates to a zeolite. The method comprises the following steps: mixing a kaolin material and an alkaline solution, reacting, and filtering to separate out activated kaolin; dissolving the obtained activated kaolin in hydrochloric acid, and reacting while stirring; filtering the obtained solution to obtain a kaolin acidolysis solution which contains no solid mineral impurities; regulating the pH value of the obtained kaolin acidolysis solution to 3-14 with NaOH, and filtering to obtain a stable flocculent activated silicon-aluminum material; and mixing the obtained stable flocculent activated silicon-aluminum material with the alkaline solution, performing hydrothermal synthesis reaction, washing, and filtering to obtain the P type zeolite. Thus, the synthesis cost of the P type zeolite can be obviously lowered; the product quality can be improved; the synthesis can be realized by only taking kaolin as the material without external silicon sources; the defects that the energy consumption is high, external silicon sources are required, the product contains quartz, mica and other mineral impurities, etc. in the traditional process are overcome; the used material and synthesis process are low in cost; and the obtained product has favorable calcium ion exchange capability.

Description

technical field [0001] The invention relates to a zeolite, in particular to a method for synthesizing P-type zeolite from kaolin. Background technique [0002] P-type zeolite belongs to phillipsite, a tetragonal phase zeolite with a channel system composed of eight-membered ring channels in a, b, and c directions. P-type zeolite can efficiently remove calcium and magnesium hard ions in water with its high specific surface area and good ion exchange capacity, so it is widely used in the production of phosphorus-free detergents to reduce the serious pollution of sodium tripolyphosphate in detergents to the environment. [0003] According to the source of P-type zeolite synthetic silicon-alumina raw materials, the synthesis method of P-type zeolite can be divided into chemical synthesis and mineral synthesis. The chemical synthesis method refers to the synthesis of chemical reagents such as sodium silicate, sodium aluminate and aluminum chloride as raw materials. The mineral ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/02
Inventor 宓锦校王景泉
Owner XIAMEN UNIV
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