A type zeolite and preparation method thereof

A zeolite and paper-made technology, applied in the field of A-type zeolite and its preparation, can solve the problems of reduced performance stability of zeolite, high production cost of A-type zeolite, difficulty in controlling the quality of zeolite, etc., achieves fast crystallization speed and increases market competitiveness , the effect of superior performance

Inactive Publication Date: 2012-03-28
杨辉
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AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a type A zeolite and its preparation method; solve the problems of high production cost and complicated process steps of type A zeolite in the prior art, and It mainly solves the technical problems that the performance stability of the generated zeolite is reduced and it is difficult to control the quality of the zeolite when rice husk ash, bagasse ash, diatomaceous earth and other combustion ash are used as raw materials.

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  • A type zeolite and preparation method thereof
  • A type zeolite and preparation method thereof
  • A type zeolite and preparation method thereof

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preparation example Construction

[0014] The preparation of incineration ash also has an impact on the quality of subsequent A-type zeolite products. Continuous low-temperature incineration with an incineration temperature below 500 ° C will not cause SiO contained in the incineration ash 2 Crystallization occurs, and the solubility in alkaline solvents such as NaOH is improved, and the SiO contained in the incineration ash is effectively utilized to the maximum extent 2 ; In addition, the incineration ash should be stirred during incineration, so that the raw materials for incineration in the incinerator can be burned at a uniform temperature, so as to increase the SiO in the incineration ash. 2 non-crystalline nature. When stirring the incinerator, it can also reduce the content of unburned carbon element (C), providing good conditions for the synthesis of white zeolite;

[0015] Raw materials for incineration can be rice husk, bagasse, diatomaceous earth, coal or paper.

[0016] Proceed as follows:

[00...

Embodiment 1

[0035] (1) Dissolution: Put the modified rice husk in an incinerator and incinerate at a temperature of 500°C for 25 minutes to obtain incineration ash. After heating the 3N NaOH solution, the temperature was 98°C, and heated for 2.5 hours, the SiO in the obtained solution 2 The dissolution rate is more than 90%;

[0036] (2) Crystallization: aluminum hydroxide and sodium hydroxide in a weight ratio of 7:5, react at 90-100°C for 2 hours, and prepare sodium metaaluminate according to the added amount of modified rice husk ash The volume ratio of 1:5 is added to the solution of step (1) for crystallization, the crystallization time is 2 hours, and the crystallization temperature is 98°C; during the reaction process, continue to add 3N sodium metaaluminate to make the alkalinity in the reaction system The solution concentration is kept at 0.8 ~ 3N;

[0037] (3) Drying: Filter the crystallized solution and dehydrate it to obtain a type A zeolite paste with a water content of 40%...

Embodiment 2

[0038] Embodiment 2 Type A zeolite is to the adsorption test of heavy metal in water

[0039] Add the heavy metal in 500CC of water at a specified concentration and mix and stir evenly, then add the specified amount of A-type zeolite prepared in Example 1, and after stirring for 30 minutes, analyze the residual amount of heavy metal in the aqueous solution and calculate the adsorption rate (removal rate). Pb, Cd, Zn, and Hg ions were added in the form of nitric acid compounds at 10 ppm each, while dioxin and PCB were added in the form of sols at 10 ppm and 300 ppm because they were insoluble in water. A-type zeolite (Ca-type: CEC=260 / 100g) is added in an amount of 1%, 5%, and 10% of the aqueous solution. As shown in Table 1, type A zeolite has a strong adsorption and removal effect on heavy metals.

[0040] Table 1 Adsorption test of A-type zeolite to heavy metals in water

[0041]

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Abstract

The invention provides an A type zeolite and a preparation method thereof. The invention solves the problems of high manufacture cost and complex process step of the A type zeolite in the prior art and the technical problems of reduced performance stability of the generated zeolite and difficult control of zeolite quality when the combustion ash, such as paddy husk ash, bagasse ash, diatomite, and the like are adopted as raw materials. The A type zeolite is prepared from burning ash, the main component of which is SiO2, as a raw material in an alkaline solution through hydrothermal reaction. The method comprises the following steps of: hydrothermally dissolving the burning ash in the alkaline solution; adding sodium metaaluminate for crystallization; washing in water, filtering and dryingto obtain the A type zeolite. The method has shorter reaction time, high crystallizing speed, more favorable and stable performance of the generated A type zeolite and obvious economic benefit, obviously reduces the production cost, simplifies the preparation step, and improves the yield and the market competition of products.

Description

technical field [0001] The invention belongs to the technical field of A-type zeolite, and more specifically relates to an A-type zeolite and a preparation method thereof. Background technique [0002] Previously, zeolites were produced by various methods. Among them are production methods using industrial waste as raw materials. For example, using combustion ashes such as rice hull ash, bagasse ash, and diatomaceous earth as raw materials to produce zeolite, but due to the SiO in these combustion ash 2 with Al 2 o 3 The content ratio of zeolite is often uncertain and not a stable fixed value, so the performance stability of the generated zeolite is reduced, and it is difficult to control the quality of zeolite. Generally speaking, due to the SiO contained in these combustion ash 2 and Al 2 o 3 , if the hydrothermal reaction is carried out directly in the alkaline solution, when the initial reaction is carried out in the alkaline hot water, the two components are sele...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/14B09B3/00
Inventor 古川祖东
Owner 杨辉
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