Novel process for synthesizing molecular sieve by calcining fly ash through wet alkalization
A fly ash and molecular sieve technology, applied in the direction of crystalline aluminosilicate zeolite, etc., can solve the problems of whiteness, crystallinity and low yield, and achieve the effect of improving whiteness, upgrading grades, and strengthening high-temperature activation reactions
Inactive Publication Date: 2010-09-01
张勤善 +2
View PDF1 Cites 1 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0007] The purpose of the present invention is to propose a process for synthesizing molecular sieves with fly ash, so as to overcome the problems of low whiteness, crystallinity and yield in the current synthetic molecular sieve products with fly ash
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0011] Weigh 500 grams of the fly ash dry material that is taken from the power plant, according to material; Ball stone; Below 0.03%, unload the slurry and use a high-strength magnet to remove iron, then add hydrochloric acid to the slurry to make the liquid-solid ratio about 0.5-5:1, and the concentration of hydrochloric acid reaches 5-15%, stirring and mixing to further acid-dissolve and remove iron , then filter and wash, wash the fly ash with deionized water so that the pH value of the washing water is close to neutral, and then press the fly ash; sodium hydroxide; Add sodium hydroxide to the slurry to dissolve it in the slurry, stir and mix evenly, put the slurry in a drying oven and dry it at 110°C, then put the dried material into a muffle furnace and heat it up to 600-900°C to keep it warm After 0.5 to 2.0 hours, immediately take out the calcined material and put it into weighed tap water for quenching, add other batching materials to the quenched slurry and put it in...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention belongs to the technical field of comprehensive utilization of fly ash, and particularly relates to a novel process for synthesizing a molecular sieve by adding alkali to calcine the fly ash by a wet method. The process comprises the following steps: the fly ash is ground, iron in the fly ash is removed by a high-strength magnet and acid dissolution, the fly ash is filtered and washed to be approximately neutral, then a proper amount of strong base is dissolved in water to be mixed with the fly ash to be dried, the calcination activation is performed at proper temperature, the quenching treatment is performed, a calcinated material and other auxiliary materials are ground into slurry and iron in the materials is removed by the high-strength magnet, and a molecular sieve product can be obtained through gel formation, crystallization synthesis, filtration, washing, and drying at the preset temperature. The adoption of the process can remarkably improve the whiteness, crystallinity degree and yield of the molecular sieve product synthesized by the fly ash by a hydro-thermal method, can also shorten the reaction time of the gel formation and the crystallization synthesis, improve production efficiency, reduce the consumption of acid and alkali raw materials, and reduce the activation calcination temperature of the fly ash and the consumption of thermal energy.
Description
technical field [0001] The invention belongs to the technical field of comprehensive utilization of fly ash, and in particular relates to a process for synthesizing molecular sieves by calcining fly ash with alkali in a wet method. Background technique [0002] Fly ash is a fine-grained dispersed residue produced by burning coal or pulverized coal in the production process of coal-fired power plants. With the development of economic construction, its emissions are increasing day by day. At present, fly ash is mostly used to produce construction materials such as cement, unburned bricks and blocks with low added value. [0003] The research on synthesizing molecular sieves with fly ash started in 1985 and has a history of only 21 years. Molecular sieve products are widely used in various departments of national economic construction, especially in petrochemical industry, fine chemical industry, medicine, gas separation, synthetic detergent, sewage treatment and so on. [0...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/02
Inventor 张勤善付克明朱虹
Owner 张勤善