Method for recycling waste alkali liquor generated by absorbing HCl and application of the method

A technology for waste lye and absorbing liquid, applied in chemical instruments and methods, alkali metal fluoride, preparation with chloride, etc., can solve the problems of increased cost, waste, environmental pollution, etc., and save the cost of waste disposal and production and operation. cost, cost-saving effect

Pending Publication Date: 2020-06-12
HAWK SHANGHAI ENVIRONMENTAL TECH
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Problems solved by technology

[0011] Therefore, in the process of manufacturing quartz products or optical fiber preforms and other products, the optical fiber industry is constantly generating waste, and the waste treatment process adopted will also generate waste that needs to be disposed of or needs to be further processed in order to make the discharge meet the standard ; This not only increases the cost and causes waste, but also causes serious pollution to the environment

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  • Method for recycling waste alkali liquor generated by absorbing HCl and application of the method

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Embodiment Construction

[0034] The present invention will be described in detail below in conjunction with the drawings.

[0035] The present invention provides a method for reusing waste lye produced by absorbing HCl. The method includes the following steps:

[0036] (1) Add the waste liquid produced by quartz etching treatment to the waste lye produced by absorbing HCl, HF, H 2 SiF 6 React with NaCl and NaOH to produce NaF and Na 2 SiF 6 And dilute hydrochloric acid;

[0037] (2) Combine the NaF and Na obtained in step (1) 2 SiF 6 Add excess Na 2 CO 3 In the solution, heat and stir well, Na 2 SiF 6 And Na 2 CO 3 Reaction to produce NaF, SiO 2 And CO 2 .

[0038] In the method for reusing the waste lye produced by absorbing HCl provided by the present invention, the effects of treating waste with waste and reusing waste are achieved. Firstly, after absorbing the HCl gas through the NaOH solution, a waste lye containing NaCl and NaOH is obtained. In order to avoid the discharge of a large amount of absorbed ...

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Abstract

The invention discloses a method for recycling waste alkali liquor generated by absorbing HCl and an application of the method. The recycling method of the waste alkali liquor generated by absorbing HCl comprises the following steps: (1) adding waste liquor generated by quartz etching treatment, HF, H2SiF6, NaCl and NaOH into the waste alkali liquor generated by absorbing HCl, and carrying out a reaction to generate NaF, Na2SiF6 and diluted hydrochloric acid; and (2) adding the NaF and Na2SiF6 obtained in the step (1) into excessive Na2CO3 solution, heating and fully stirring the mixed solution, and carrying out a reaction on the Na2SiF6 with the Na2CO3 to generate NaF, SiO2 and CO2. According to the invention, the problem of outward discharge is avoided, further treatment is not requiredto be considered to reach the discharge standard, and the cost is saved; not only can the effect of treating waste with waste be achieved, but also by-products with market value can be generated to achieve the effect of converting waste into things of value.

Description

Technical field [0001] The invention relates to a method for reusing waste lye produced by absorbing HCl and its application. Background technique [0002] In general, the waste gas containing HCl is first absorbed by water to form a hydrochloric acid solution, and the remaining HCl is then finally absorbed by NaOH lye as shown in Reaction Formula 1 to produce a waste liquid containing NaCl; alternatively, excess NaOH is used directly The lye absorbs the waste gas containing HCl to produce waste lye containing NaCl. In the manufacturing process of optical fiber preforms or high-purity quartz products, the commonly used vapor deposition method places the raw material silicon tetrachloride under a hydrogen-oxygen flame for high-temperature hydrolysis as shown in Reaction Equation 2, which will produce HCl and SiO 2 Exhaust gas of fine powder. SiO 2 After the fine powder is removed, it is then used the above treatment method to absorb the waste gas containing HCl. [0003] HCl+NaOH→...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/02C01B33/18C01B7/03C01B7/07C02F1/66C02F101/14C02F103/18
CPCC01D3/02C01B33/186C01B7/035C01B7/0706C02F1/66C02F2101/14C02F2103/18
Inventor 吴涛
Owner HAWK SHANGHAI ENVIRONMENTAL TECH
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