CN105621457A - Regeneration recycling method of sodium hydroxide - Google Patents
Regeneration recycling method of sodium hydroxide Download PDFInfo
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- CN105621457A CN105621457A CN201410592913.7A CN201410592913A CN105621457A CN 105621457 A CN105621457 A CN 105621457A CN 201410592913 A CN201410592913 A CN 201410592913A CN 105621457 A CN105621457 A CN 105621457A
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- sodium
- solution
- calcium carbonate
- sodium hydroxide
- sodium bicarbonate
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Abstract
The invention discloses a regeneration recycling method of sodium hydroxide. The method is mainly used for regeneration recycling use after usage of sodium hydroxide in metallurgical and chemical engineering process. The technological process is as follows: firstly adding calcium carbonate into a sodium sulfate salt solution, adjusting pH value of the solution by introducing carbon dioxide or adding sulfuric acid to convert sodium sulfate salt to sodium bicarbonate, filtering to obtain gypsum and a sodium bicarbonate solution, causticizing by adding lime into the sodium bicarbonate solution, filtering to obtain a regenerated sodium hydroxide solution and calcium carbonate, and continuously using calcium carbonate by returning calcium carbonate to sodium sulfate salt conversion process. The method of the invention has a simple technology, is convenient to operate and is economic and environmentally friendly.
Description
Technical field
The invention belongs to chemical technology field, be specifically related to a kind of method for recycling sodium hydroxide.
Background technology
Method for recycling sodium hydroxide at least includes the basic process such as extraction, decompression distillation, crystallization, filtration. In current method for recycling sodium hydroxide, technological process is not easy to implement, and the sodium hydroxide purity of generation is low, and reactant conversion per pass is low, and manufacturing process is complicated, and production efficiency is low.
Summary of the invention
For the above-mentioned technical problem overcoming prior art to exist, it is an object of the invention to, it is provided that a kind of method for recycling sodium hydroxide, the present invention not only manufacturing process is simple, improve work efficiency, and the product purity generated is big.
Method for recycling sodium hydroxide provided by the invention, comprises the following steps:
(1) first in metabisulfite solution, sodium bisulfate or sodium sulfate and sodium bisulfate mixed solution, the particle diameter calcium carbonate powder less than 420 ��m is added by forming sodium bicarbonate chemical reaction stoichiometric number 2.0-5.0 times, and pass into carbon dioxide or add the pH value 4.0-8.0 of sulfuric acid regulation solution, make sodium sulfate salt become sodium bicarbonate transition, be filtrated to get Gypsum Fibrosum and sodium bicarbonate solution;
(2) then calcium oxide or calcium hydroxide are added in sodium bicarbonate solution by sodium bicarbonate causticization chemical reaction stoichiometric number 1.0-2.5 times again, carry out causticizing reaction, it is filtrated to get calcium carbonate and regeneration sodium hydroxide solution, calcium carbonate returns in (1) step and is continuing with, the sodium hydroxide solution that regeneration obtains directly returns required process cycles and uses, or uses with the process cycles that the form return of soda lye or sodium hydrate solid is required after concentration.
Method for recycling sodium hydroxide provided by the invention, it has the beneficial effects that, overcomes operation in the technical process of prior art production sodium hydroxide process more, and the problem that workload is big improves work efficiency; Improve reactant thing conversion per pass.
Detailed description of the invention
Below in conjunction with an embodiment, method for recycling sodium hydroxide provided by the invention is described in detail.
Embodiment
The method for recycling sodium hydroxide of the present embodiment, comprises the following steps:
(1) first in metabisulfite solution, sodium bisulfate or sodium sulfate and sodium bisulfate mixed solution, the calcium carbonate powder that particle diameter is 420 ��m is added by forming sodium bicarbonate chemical reaction stoichiometric number 30 times, and pass into carbon dioxide or add the pH value 60 of sulfuric acid regulation solution, make sodium sulfate salt become sodium bicarbonate transition, be filtrated to get Gypsum Fibrosum and sodium bicarbonate solution;
(2) then press sodium bicarbonate causticization chemical reaction stoichiometric number 2.5 times again and add calcium oxide or calcium hydroxide in sodium bicarbonate solution, carry out causticizing reaction, it is filtrated to get calcium carbonate and regeneration sodium hydroxide solution, calcium carbonate returns in (1) step and is continuing with, the sodium hydroxide solution that regeneration obtains directly returns required process cycles and uses, or uses with the process cycles that the form return of soda lye or sodium hydrate solid is required after concentration.
Method for recycling sodium hydroxide, it is not necessary to be processed further, operation is simple, greatly reduces cost, it is easy to implement.
Claims (1)
1. a method for recycling sodium hydroxide, it is characterised in that: said method comprising the steps of:
(1) first in metabisulfite solution, sodium bisulfate or sodium sulfate and sodium bisulfate mixed solution, the particle diameter calcium carbonate powder less than 420 ��m is added by forming sodium bicarbonate chemical reaction stoichiometric number 2.0-5.0 times, and pass into carbon dioxide or add the pH value 4.0-8.0 of sulfuric acid regulation solution, make sodium sulfate salt become sodium bicarbonate transition, be filtrated to get Gypsum Fibrosum and sodium bicarbonate solution;
(2) then calcium oxide or calcium hydroxide are added in sodium bicarbonate solution by sodium bicarbonate causticization chemical reaction stoichiometric number 1.0-2.5 times again, carry out causticizing reaction, it is filtrated to get calcium carbonate and regeneration sodium hydroxide solution, calcium carbonate returns in (1) step and is continuing with, the sodium hydroxide solution that regeneration obtains directly returns required process cycles and uses, or uses with the process cycles that the form return of soda lye or sodium hydrate solid is required after concentration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410592913.7A CN105621457A (en) | 2014-10-30 | 2014-10-30 | Regeneration recycling method of sodium hydroxide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410592913.7A CN105621457A (en) | 2014-10-30 | 2014-10-30 | Regeneration recycling method of sodium hydroxide |
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| CN105621457A true CN105621457A (en) | 2016-06-01 |
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| CN201410592913.7A Pending CN105621457A (en) | 2014-10-30 | 2014-10-30 | Regeneration recycling method of sodium hydroxide |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110563007A (en) * | 2019-09-29 | 2019-12-13 | 上海交通大学 | Method for converting sodium sulfate into sodium bicarbonate by using calcium oxide and carbon dioxide |
| CN112758959A (en) * | 2021-03-12 | 2021-05-07 | 自贡鸿鹤制药有限责任公司 | Preparation method of sodium bicarbonate |
| CN115403059A (en) * | 2022-09-02 | 2022-11-29 | 东方电气集团东方锅炉股份有限公司 | Method and system for recycling sodium bicarbonate dry-process desulfurized fly ash |
-
2014
- 2014-10-30 CN CN201410592913.7A patent/CN105621457A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110563007A (en) * | 2019-09-29 | 2019-12-13 | 上海交通大学 | Method for converting sodium sulfate into sodium bicarbonate by using calcium oxide and carbon dioxide |
| CN110563007B (en) * | 2019-09-29 | 2021-11-26 | 上海交通大学 | Method for converting sodium sulfate into sodium bicarbonate by using calcium oxide and carbon dioxide |
| CN112758959A (en) * | 2021-03-12 | 2021-05-07 | 自贡鸿鹤制药有限责任公司 | Preparation method of sodium bicarbonate |
| CN115403059A (en) * | 2022-09-02 | 2022-11-29 | 东方电气集团东方锅炉股份有限公司 | Method and system for recycling sodium bicarbonate dry-process desulfurized fly ash |
| CN115403059B (en) * | 2022-09-02 | 2023-07-07 | 东方电气集团东方锅炉股份有限公司 | Method and system for recycling baking soda dry desulfurization ash |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160601 |
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| WD01 | Invention patent application deemed withdrawn after publication |