CN1045567A - Improved preparation process of sodium hydroxide with causticization - Google Patents
Improved preparation process of sodium hydroxide with causticization Download PDFInfo
- Publication number
- CN1045567A CN1045567A CN 89101305 CN89101305A CN1045567A CN 1045567 A CN1045567 A CN 1045567A CN 89101305 CN89101305 CN 89101305 CN 89101305 A CN89101305 A CN 89101305A CN 1045567 A CN1045567 A CN 1045567A
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- China
- Prior art keywords
- causticization
- lime
- sodium hydroxide
- preparation process
- raw material
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D1/00—Oxides or hydroxides of sodium, potassium or alkali metals in general
- C01D1/04—Hydroxides
- C01D1/20—Preparation by reacting oxides or hydroxides with alkali metal salts
- C01D1/22—Preparation by reacting oxides or hydroxides with alkali metal salts with carbonates or bicarbonates
Abstract
A kind of improved preparation process of sodium hydroxide with causticization, urao and unslaked lime are raw material to this technology preferably with soda ash or heavy alkali or quality, carry out the preceding raw materials pretreatment of causticizing reaction, remove impurity, process such as carry out successive secondary causticizing reaction and filtration, washing, evaporation, fusion, drying again, pulverize, sieve can make caustic soda and light calcium carbonate finished product simultaneously.Adopt this technology, can not only improve caustic soda quality and raw material availability, and the lime mud waste residue is fully used, to reduce environmental pollution.
Description
The invention relates to a kind of improvement of preparation process of sodium hydroxide with causticization.It is applicable to that with soda ash (or heavy alkali and quality urao) preferably and lime be the causticization process of raw material.
The causticization process process of existing causticization legal system caustic soda can be summarized as: soda ash dissolving back in the causticization pond, is heated to 90 ℃, stirs, add superfluous lime or milk of lime and carry out causticizing reaction, until the transformation efficiency that obtains expecting.Then, filter and wash.Filtrate is sent to evaporation, and fusion makes the NaOH finished product.Lime mud after washing is then abandoned it as waste residue.The shortcoming of existing causticization process is: because raw material (alkali and lime) is brought the impurity of a great deal of into to reaction system, so often there is the unstable and lower problem of raw material availability of caustic soda quality; Produce simultaneously the waste residue-lime mud of serious environment pollution again,,, be difficult to obtain purified CaCO so only depend on washing because of containing impurity and the remaining lime that raw material is brought in the lime mud
3Be to solve the pollution problem of lime mud, people seldom set about from causticization process itself, but lime mud are carried out complex process such as post rinse, back drying, and pulverizing is to make light calcium carbonate.But this kind method, investment is big, complex process, quality product is low, lessly is used for actual production, and most lime mud is abandoned it as waste residue, the lime mud that is discarded can damage the farmland, influence plant growth, causes the serious environmental pollution.
The objective of the invention is to be to provide a kind of causticization novel process that can produce caustic soda and light calcium carbonate simultaneously.This technology can make caustic soda quality and raw material availability be improved, and particularly in the causticization process process, can produce caustic soda and light calcium carbonate simultaneously, thereby can reduce environmental pollution, and refuse is fully used.
Detailed technology content of the present invention is: earlier with raw materials pretreatment; That is: alkali is made solution, filter, lime is made milk of lime, sieves with 120-200 mesh sieve.Carry out the continuous quadratic causticization again; A certain amount of alkaline solution is added in the causticization pond, is heated to 60-100 ℃, stir, adds excessive milk of lime and carry out causticization one time, until reach the expection transformation efficiency 94% or more till, clarify then, with the clear liquor taking-up evaporate, fusion makes caustic soda.Add excessive alkaline solution again in a lime mud, stir, the secondary causticization is carried out in heating, and (CaO) reacts completely to calcium oxide.Thereafter, secondary causticization thing is filtered, contain excessive N a in its filtrate
2CO
3, be difficult to direct evaporation, can be used for a causticization of next round, filter residue is washed again, washings is used for choline or ashing, and excess is moisture light calcium carbonate.At last, in 105-110 ℃ of oven dry, through pulverizing, sieve (120 order) promptly gets light calcium carbonate with moisture light calcium carbonate.
The present invention is because the pre-treatment of raw material before having carried out causticizing reaction, can reduce raw material and bring the impurity of reaction system into, the quality and the raw material availability of caustic soda all are improved, and the more important thing is has increased the secondary causticization, has eliminated the remaining lime in the lime mud, make lime mud only by washing like this, can obtain purified moisture light calcium carbonate, drying is pulverized again, sieve the light calcium carbonate finished product, refuse is fully used.Simultaneously, adopt this technology to produce the different light calcium carbonate of settling volume by red-tape operati condition (as temperature of reaction etc.).
Accompanying drawing is improved preparation process of sodium hydroxide with causticization schema.
The following examples further specify technological process of the present invention.
Embodiment 1: get weight ratio and be 212: 84 soda ash (Na
2CO
3) and unslaked lime (CaO), be dissolved in water the respectively soda ash solution of making 21 ° of Baumes and the milk of lime that contains calcium oxide (CaO) 150 grams per liters filter soda ash solution, and milk of lime sieves in (140 order), and is standby.Thereafter, the soda ash solution of getting half amount places the causticization pond, is heated to 85 ℃, stirs, and adds milk of lime and continues reaction, and to the transformation efficiency that reaches expection more than 94%, clear liquor is evaporated in clarification again, and fusion makes the NaOH finished product.In a lime mud, add the soda ash solution of second half amount again, carry out the secondary causticization, treat that calcium oxide (CaO) reacts completely after, filter, filtrate is used for a causticization of next round, and the secondary lime mud is washed with water totally.Then, with the lime mud of washes clean, place under 110 ℃ the condition and dry, through pulverizing, sieve (120 order) can make the light calcium carbonate finished product again.
Embodiment 2: get weight ratio and be 168: 84 heavy alkali (NaHCO
3) and unslaked lime (CaO), be dissolved in water the respectively heavy alkaline solution of making 22 ° of Baumes and the milk of lime that contains calcium oxide (CaO) 150 grams per liters, following steps are then identical with embodiment 1.
Claims (3)
1, a kind of improved preparation process of sodium hydroxide with causticization comprises that alkaline solution heats, stirs, adds steps such as causticization of superfluous lime breast, filtration, washing, evaporation, fusion and makes the caustic soda finished product and produce the lime mud waste residue, it is characterized in that following steps,
(1) alkaline solution is filtered, milk of lime sieves, and carries out raw materials pretreatment, removes impurity,
(2) pretreating raw material is carried out a causticization (milk of lime is excessive), clear liquor makes the caustic soda finished product, meanwhile, in a lime mud, add excessive alkaline solution again, stir, heat, carry out the secondary causticization, after reacting completely to calcium oxide (CaO), filter, filter residue is washed again, get moisture light calcium carbonate, drying, pulverize, sieve (120 order) make the light calcium carbonate finished product again.
2, improved according to claim 1 preparation process of sodium hydroxide with causticization is characterized in that, the raw material sieve that pre-treatment adopts that sieves is the 120-200 order.
3, improved according to claim 1 preparation process of sodium hydroxide with causticization, the Heating temperature that it is characterized in that causticizing reaction is 60-100 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89101305 CN1022557C (en) | 1989-03-11 | 1989-03-11 | Improved preparation process of sodium hydroxide with causticization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89101305 CN1022557C (en) | 1989-03-11 | 1989-03-11 | Improved preparation process of sodium hydroxide with causticization |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1045567A true CN1045567A (en) | 1990-09-26 |
| CN1022557C CN1022557C (en) | 1993-10-27 |
Family
ID=4854221
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 89101305 Expired - Fee Related CN1022557C (en) | 1989-03-11 | 1989-03-11 | Improved preparation process of sodium hydroxide with causticization |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1022557C (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003066961A1 (en) * | 2002-02-09 | 2003-08-14 | Tianzhao Ai | A process of recovering alkali from black liquor of papermaking |
| CN101020182B (en) * | 2006-02-16 | 2010-09-08 | 王梅林 | Process of comprehensively utilizing caustic sludge from papermaking industry |
| CN101591029B (en) * | 2008-05-28 | 2011-01-12 | 北京紫光英力化工技术有限公司 | Novel process for preparing caustic soda and ultrafine calcium carbonate through caustification method |
| CN101811706B (en) * | 2009-12-17 | 2012-02-22 | 曲靖众一精细化工股份有限公司 | Causticized alkali liquor efficient separation method |
| CN105600806A (en) * | 2016-03-10 | 2016-05-25 | 河南工程学院 | Reaction device for preparing industrial sodium hydroxide from carbide slag |
| CN107337216A (en) * | 2017-07-18 | 2017-11-10 | 昊青薪材（北京）技术有限公司 | A kind of method that potassium feldspar hydro-thermal alkaline process prepares potassium hydroxide |
| EP3646938A4 (en) * | 2018-05-19 | 2020-11-04 | Sentec Co. Ltd. | Treatment method for reducing carbon dioxide discharge amount of combustion exhaust gas |
-
1989
- 1989-03-11 CN CN 89101305 patent/CN1022557C/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003066961A1 (en) * | 2002-02-09 | 2003-08-14 | Tianzhao Ai | A process of recovering alkali from black liquor of papermaking |
| US7291245B2 (en) | 2002-02-09 | 2007-11-06 | Tianzhao Ai | Process for causticizing green liquor in chemical recovery from black liquor in alkaline pulping |
| CN101020182B (en) * | 2006-02-16 | 2010-09-08 | 王梅林 | Process of comprehensively utilizing caustic sludge from papermaking industry |
| CN101591029B (en) * | 2008-05-28 | 2011-01-12 | 北京紫光英力化工技术有限公司 | Novel process for preparing caustic soda and ultrafine calcium carbonate through caustification method |
| CN101811706B (en) * | 2009-12-17 | 2012-02-22 | 曲靖众一精细化工股份有限公司 | Causticized alkali liquor efficient separation method |
| CN105600806A (en) * | 2016-03-10 | 2016-05-25 | 河南工程学院 | Reaction device for preparing industrial sodium hydroxide from carbide slag |
| CN105600806B (en) * | 2016-03-10 | 2017-06-06 | 河南工程学院 | Carbide slag prepares industrial sodium hydroxide reaction unit |
| CN107337216A (en) * | 2017-07-18 | 2017-11-10 | 昊青薪材（北京）技术有限公司 | A kind of method that potassium feldspar hydro-thermal alkaline process prepares potassium hydroxide |
| EP3646938A4 (en) * | 2018-05-19 | 2020-11-04 | Sentec Co. Ltd. | Treatment method for reducing carbon dioxide discharge amount of combustion exhaust gas |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1022557C (en) | 1993-10-27 |
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