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Waste treatment method of gas-phase method quartz product manufacturing process and waste treatment method of optical fiber preform rod manufacturing process

A technology for product manufacturing and waste treatment, applied in the direction of separation methods, chemical instruments and methods, water/sewage multi-stage treatment, etc., can solve the problems of large quantities and troubles of optical fiber enterprises, and achieve reduced investment, high production rate, and realization of the system The effect of zero emissions

Active Publication Date: 2018-05-04
HAWK SHANGHAI ENVIRONMENTAL TECH
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Problems solved by technology

[0026] Therefore, the waste treatment processes currently used in the optical fiber industry will produce waste that needs to be further processed or discarded, and the amount is large, which has brought great troubles to many optical fiber companies.

Method used

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  • Waste treatment method of gas-phase method quartz product manufacturing process and waste treatment method of optical fiber preform rod manufacturing process

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Embodiment Construction

[0048] The present invention will be further described in detail below in conjunction with the drawings.

[0049] Such as figure 1 As shown, the waste treatment method of the gas phase method quartz product manufacturing process includes the steps

[0050] The waste gas generated in the quartz deposition step of the vapor phase method is treated by the dust collector. Part of the HCl gas is washed with water to generate hydrochloric acid, and the remaining HCl gas reacts with NaOH to generate NaCl and H 2 O, the generated NaCl is added to the second reaction vessel.

[0051] Set up the first reaction vessel, such as figure 1 The 1# reaction cell shown, the exhaust gas produced by the gas phase method quartz deposition step is treated by the dust collector SiO 2 Is added to the first reaction vessel; at least a part of the waste liquid produced by the quartz etching process is added into the first reaction vessel, and the silicon dioxide reacts with the HF in the waste liquid produce...

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Abstract

The invention discloses a waste treatment method in the gas-phase method quartz product manufacturing process and a waste treatment method in the optical fiber preform rod manufacturing process. In the waste treatment method of the gas-phase process quartz product manufacturing process of the present invention, SiO2 micropowder is added in the first reaction container; waste liquid produced by quartz etching treatment is added in the first reaction container; H2SiF6 reacts with NaCl to generate Na2SiF6 and HCl; the HF and NaOH in the waste liquid produced by the quartz etching process react to generate NaF and water, and the H2SiF6 and NaOH in the waste liquid produced by the quartz etching process react to generate Na2SiF6 and water; Add Na2SiF6 and Na2SiF6 and NaF produced in the third reaction vessel into the fourth reaction vessel, and add Na2CO3 into the fourth reaction vessel, Na2SiF6 and Na2CO3 react to generate NaF, SiO2 and CO2. This comprehensive treatment process can completely replace the original CaF2 neutralization and precipitation process, reducing the investment in the wastewater treatment system. No residual fluoride ions. Able to achieve the goal of zero emissions from the system.

Description

Technical field [0001] The invention relates to a waste treatment method of a gas phase method quartz product manufacturing process and a waste treatment method of an optical fiber preform manufacturing process. Background technique [0002] Quartz products have a wide range of uses. According to different uses, they have various shapes such as rods and blocks. Especially in the field of optical fiber, optical fiber preform is one of the application forms of quartz products. [0003] There are many ways to manufacture quartz products. For example, vapor deposition is one of the common manufacturing processes. The optical fiber preform is the base material for optical fiber drawing, and the composition is high-purity silica. At present, vapor deposition methods are used to manufacture optical fiber preforms or high-purity quartz crystals. In OVD or VAD process, SiCl 4 The raw material undergoes high-temperature hydrolysis under a hydrogen-oxygen flame and deposits into a quartz g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04B01D53/78B01D53/68C01B33/10C01D3/02C02F101/14
CPCY02C20/30
Inventor 吴涛苏国雄杨吉耀
Owner HAWK SHANGHAI ENVIRONMENTAL TECH
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