Silicon-containing wastewater treatment method, silicon-containing wastewater utilization system, molecular sieve preparation method and molecular sieve preparation system

A treatment method, molecular sieve technology, applied in ceramic wastewater treatment, molecular sieve and alkali exchange compound, natural water treatment, etc., can solve the problems such as adverse effects of molecular sieve quality, achieve high silicon recovery rate, high waste water utilization rate effect

Active Publication Date: 2016-05-04
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0017] However, the above-mentioned method must use a flocculant when reclaiming the silicon element in the silicon-containing washing wastewater, which causes the reclaimed silicon to also contain a flocculant, and may have an adverse effect on the quality of the molecular sieve when the reclaimed silicon is recycled for the preparation of molecular sieves. And the actual operation shows that the silicon recovery rate of the above method still needs to be further improved
In addition, the above method only realizes partial reuse of silicon-containing washing wastewater, and still produces a certain amount of external drainage

Method used

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  • Silicon-containing wastewater treatment method, silicon-containing wastewater utilization system, molecular sieve preparation method and molecular sieve preparation system
  • Silicon-containing wastewater treatment method, silicon-containing wastewater utilization system, molecular sieve preparation method and molecular sieve preparation system
  • Silicon-containing wastewater treatment method, silicon-containing wastewater utilization system, molecular sieve preparation method and molecular sieve preparation system

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preparation example Construction

[0065] The silicon-containing wastewater comes from the preparation process of molecular sieves, and the molecular sieves can be various common silicon-containing molecular sieves, such as Y-type molecular sieves, X-type molecular sieves, A-type molecular sieves, MCM-type molecular sieves, ZSM-type molecular sieves (such as ZHP molecular sieves) ), mordenite-type molecular sieves, β-type molecular sieves and titanium-silicon molecular sieves.

[0066] The silicon-containing waste water can be the crystallization mother liquor in the molecular sieve preparation process, the washing waste water produced in the washing step, and the ion exchange waste liquid produced in the ion exchange process. The method of the present invention is particularly suitable for treating silicon-containing waste liquids with higher silicon content, for example, silicon-containing waste liquids with a silicon element content of more than 10 mg / L (such as 10-15000 mg / L), preferably more than 50 mg / L F...

Embodiment 1

[0149] The silicon-containing wastewater treated in this example is the first stage of washing wastewater generated during the preparation of hydrogen-type ZHP molecular sieves, and the types and contents of the elements contained therein are listed in Table 1.

[0150] The bipolar membrane used in this embodiment is commercially available from Aston Corporation, Japan, and the model is BP-1; the cation exchange membrane is a styrene-type homogeneous cation exchange membrane (the ion exchange capacity is 2.51meq / g dry film, film surface resistance (25°C, 0.1mol / L NaCl aqueous solution, the same below) is 4.59Ω·cm 2 ); anion-exchange membrane commercially purchased from the styrene-type homogeneous anion-exchange membrane of Hebei Guangya Company (the ion exchange capacity is 2.45meq / g dry film, and the membrane surface resistance is 9.46Ω·cm 2 ).

[0151] In this embodiment, the following technological process is adopted to treat silicon-containing wastewater.

[0152] (1) ...

Embodiment 2

[0161] Silicon-containing wastewater is treated in the same manner as in Example 1. The difference is that in step (1), sulfuric acid (mass concentration is 3.5%) is added to silicon-containing wastewater to adjust the pH value of silicon-containing wastewater to 4.8, then stirred and reacted at room temperature (25°C, the same below) for 5 hours to obtain a mixture containing colloidal silica. The content of silicon dioxide in the filter residue obtained in step (2) is 96% by weight, which can be used as a silicon source in the molecular sieve synthesis process. The experimental results are listed in Table 1 and Table 2.

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Abstract

The invention discloses a treatment method of silicon-containing wastewater in a molecular sieve preparation process. The treatment method comprises the following steps: allowing the silicon-containing wastewater to be in contact with at least one acid or at least one alkali in order to make at least parts of elemental silicon in the silicon-containing wastewater form colloid in order to obtain a colloid-containing mixture, carrying out solid-liquid separation to obtain a silicon-containing solid phase and a first liquid phase, precipitating at least parts of metal elements in the first liquid phase, carrying out solid-liquid separation to obtain a solid and a second liquid phase, and optionally carrying out electrodialysis on at least parts of the second liquid phase to obtain an acid solution and/or an alkali solution, wherein the silicon-containing solid phase can be used in molecular sieve synthesis as a raw material, the second liquid phase can be used in a molecular sieve washing process as washing water, the acid solution can be used in a molecular sieve ion exchange process, and the alkali solution can be used in the molecular sieve synthesis as an alkali source. The method treatment method has the advantages of obtaining of high silicon recovery rate and high wastewater utilization rate, basic no generation or only generation of an extremely small amount of water discharge, and low solid material discharge amount.

Description

technical field [0001] The invention relates to the field of waste water treatment, in particular to the treatment of waste water produced in the molecular sieve preparation process. Specifically, the present invention relates to a treatment method and comprehensive utilization method for silicon-containing wastewater generated during the preparation of molecular sieves. The present invention also relates to a method for preparing molecular sieves. The present invention further relates to a molecular sieve preparation system. Background technique [0002] Molecular sieves have structural characteristics such as high specific surface area, good thermal stability and water stability, and uniform pore size. They are widely used as catalytic materials, adsorption separation materials and ion exchange materials, and have a wide range of uses in the petrochemical field. Generally, after the crystallization process is completed, the crystallized product needs to be washed to remove...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C01B33/12
CPCC01B33/12C02F9/00C02F1/66C02F1/5236C02F1/4693C02F2103/12C02F2101/10C02F2301/08C01B39/00Y02A20/124C02F2103/34
Inventor 周丽娜刘中清罗一斌舒兴田
Owner CHINA PETROLEUM & CHEM CORP
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