CN1125193A - Production process for synthesizing high whiteness 4A zeolite using kaolin - Google Patents
Production process for synthesizing high whiteness 4A zeolite using kaolin Download PDFInfo
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- CN1125193A CN1125193A CN 94120152 CN94120152A CN1125193A CN 1125193 A CN1125193 A CN 1125193A CN 94120152 CN94120152 CN 94120152 CN 94120152 A CN94120152 A CN 94120152A CN 1125193 A CN1125193 A CN 1125193A
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- kaolin
- zeolite
- whiteness
- whitening
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Abstract
The present invention relates to an improvement on the production process for synthesizing 4A zeolite by using kaolin, and is characterized by adding flocculating agent carboxymethyl cellulose sodium in the course of elutriation to make the sedimentation time of kaolin suspension shortened to 1-2 h., adding vapourizing deironing agent sodium chloride and ammonium chloride in the course of high-temp. activation whitening reaction so as to make the whiteness of kaolin raised by 5-10%, and adding complex deironing whitening masking agent triethanolamine in the course of synthetic crystallization reaction so as to obtain the 4A zeolite with whiteness greater than 93.
Description
The invention relates to a method for producing a chemical product by taking kaolin as a raw material.
The 4A zeolite is an artificially synthesized sodium A zeolite, and the general formula of the zeolite is as follows: na (Na)2O·Al2O3·2SiO2·4.5H2O, it is a new-type adjuvant used as dewatering drying agent, gas cleaning agent and separating agent or detergent in chemical production instead of sodium tripolyphosphateThe low-phosphorus or non-phosphorus detergent can reduce the environmental pollution caused by residual phosphorus. In the prior art, the methods for producing 4A zeolite include chemical raw material preparation method and kaolin method. The cost for producing the 4A zeolite by the kaolin method is low, but because the kaolin clay raw material contains iron, the kaolin clay raw material shows red color as ferric iron at high temperature, the whiteness of the product is limited, and the quality is lower than that of the 4A zeolite obtained by the domestic and external chemical raw material preparation method. See "daily chemical industry" study of 4A zeolite for detergents in phase 1 of 88.
The invention aims to improve the production process of synthesizing high-whiteness 4A zeolite by using kaolin so as to obtain a high-whiteness product.
The known production process for synthesizing high-whiteness 4A zeolite from kaolin is to use natural kaolin (general formula is Al)2O3·2SiO2) Crushing, then treating with hydrochloric acid, elutriating with clear water to remove precipitated impurities, carrying out high-temperature activation whitening reaction on the selected kaolin at 600-900 ℃, then adding water and sodium hydroxide into the activated kaolin, stirring at 50-100 ℃ for 3.5-5.5 hours, and carrying out synthetic crystallization reaction to obtain 4A zeolite, wherein the reaction formula is as follows:
the invention improves the known prior production process by adding gasification de-ironing agents of sodium chloride and ammonium chloride when carrying out high-temperature activation whitening, which can improve the whiteness by 5-10 percent, wherein the dosage of the sodium chloride is 2-6 percent of the weight of the selected kaolin, the dosage of the ammonium chloride is 1-3 percent of the weight of the selected kaolin, and the reaction formula is as follows:
in the elutriation of the kaolin, in order to accelerate the precipitation of the kaolin suspension liquid after the impurities are removed, a flocculating agent sodium carboxymethyl cellulose can be added, the dosage of the flocculating agent sodium carboxymethyl cellulose is 0.02-0.2% of the weight of the kaolin, and the precipitation time can be shortened from original 8-10 hours to 1-2 hours.
The invention has the advantages that: the cheap and easily-obtained natural kaolin can be used for producing the 4A zeolite with high whiteness which is more than or equal to 93, the pentasodium tripolyphosphate can be effectively replaced to produce the detergent, and the pollution to the environment is greatly reduced.
Example (b):
taking 500 kg of natural kaolin to be fully elutriated by water in a water tank to precipitate impurities, pumping an upper layer of kaolin suspension liquid intoanother water tank, adding 0.5 kg of sodium carboxymethylcellulose, uniformly stirring, standing for 1.5 hours to ensure that the kaolin is completely precipitated at the bottom, extracting a supernatant, washing the precipitated selected kaolin for 2 times by using clear water, filtering, drying and crushing the cleaned kaolin slurry, adding 15 kg of sodium chloride and 10 kg of ammonium chloride, uniformly mixing, and then putting the mixture into a kiln at 830 +/-10 ℃ to calcine for 1.5 hours for high-temperature activation whitening.
And (2) moving the activated kaolin into a reactor, adding 4000 kg of deionized water, 16-20 kg of sodium hydroxide and 1 kg of triethanolamine, controlling the temperature to be 10-40 ℃, soaking for 12-24 hours, then stirring and heating to 55-65 ℃, reacting for 1 hour, continuously heating to 90-100 ℃, and reacting for 2-3 hours to complete the synthetic crystallization reaction to obtain the 4A zeolite.
Claims (2)
1. A production process for synthesizing high-whiteness 4A zeolite by using kaolin comprises the steps of crushing natural kaolin, treating with hydrochloric acid, elutriating with clear water to remove precipitated impurities, carrying out high-temperature activation whitening reaction on selected kaolin at 600-900 ℃, adding water and sodium hydroxide into the activated kaolin, stirring for 3.5-5.5 hours at 50-100 ℃ and carrying out synthetic crystallization reaction to obtain 4A zeolite, and is characterized in that: and (2) adding a gasification de-ironing agent during the high-temperature activation whitening reaction, wherein the dosage of sodium chloride is 2-6% of the weight of the selected kaolin, the dosage of ammonium chloride is 1-3% of the weight of the selected kaolin, and a complexing de-ironing whitening masking agent is added during the synthesis crystallization reaction, and the dosage of triethanolamine is 0.1-0.5% of the weight of the activated kaolin.
2. The process of claim 1, wherein the kaolin is used to synthesize high-whiteness 4A zeolite, and the process comprises the following steps: a flocculating agent can be added in the clear water elutriation process of the natural kaolin, and the dosage of the sodium carboxymethyl cellulose is 0.02-2% of the weight of the kaolin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94120152 CN1125193A (en) | 1994-12-20 | 1994-12-20 | Production process for synthesizing high whiteness 4A zeolite using kaolin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94120152 CN1125193A (en) | 1994-12-20 | 1994-12-20 | Production process for synthesizing high whiteness 4A zeolite using kaolin |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1125193A true CN1125193A (en) | 1996-06-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94120152 Pending CN1125193A (en) | 1994-12-20 | 1994-12-20 | Production process for synthesizing high whiteness 4A zeolite using kaolin |
Country Status (1)
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| CN (1) | CN1125193A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1103635C (en) * | 1998-01-22 | 2003-03-26 | 南京大学 | Synthesis of 4A zeolite by sei-synthesis |
| CN102351520A (en) * | 2011-07-04 | 2012-02-15 | 中国地质大学（武汉） | Method for preparing white ceramic by use of natural zeolite |
| CN103555005A (en) * | 2013-10-12 | 2014-02-05 | 河曲县正阳高岭土有限公司 | Preparation method of modified kaolin used as rubber reinforcing agent |
| CN104211082A (en) * | 2013-06-03 | 2014-12-17 | 中国石油大学(北京) | Synthetic method of 4A molecular sieve |
| CN106914039A (en) * | 2017-04-26 | 2017-07-04 | 揭阳恒成陶瓷科技有限公司 | Rapid precipitation technique after a kind of kaolin slurrying |
| CN108190909A (en) * | 2018-03-16 | 2018-06-22 | 淮阴工学院 | The method that 4A zeolites are prepared as raw material slightly soluble agent using kaolin |
| CN110436473A (en) * | 2019-08-27 | 2019-11-12 | 陕西国防工业职业技术学院 | A kind of coal slime activation method for capableing of iron-removal and whitening |
| CN114804133A (en) * | 2021-05-28 | 2022-07-29 | 内蒙古先进陶瓷设计院有限公司 | Method for calcining coal-series kaolin at low temperature and application thereof |
-
1994
- 1994-12-20 CN CN 94120152 patent/CN1125193A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1103635C (en) * | 1998-01-22 | 2003-03-26 | 南京大学 | Synthesis of 4A zeolite by sei-synthesis |
| CN102351520A (en) * | 2011-07-04 | 2012-02-15 | 中国地质大学（武汉） | Method for preparing white ceramic by use of natural zeolite |
| CN102351520B (en) * | 2011-07-04 | 2012-12-26 | 中国地质大学（武汉） | Method for preparing white ceramic by use of natural zeolite |
| CN104211082A (en) * | 2013-06-03 | 2014-12-17 | 中国石油大学(北京) | Synthetic method of 4A molecular sieve |
| CN103555005A (en) * | 2013-10-12 | 2014-02-05 | 河曲县正阳高岭土有限公司 | Preparation method of modified kaolin used as rubber reinforcing agent |
| CN106914039A (en) * | 2017-04-26 | 2017-07-04 | 揭阳恒成陶瓷科技有限公司 | Rapid precipitation technique after a kind of kaolin slurrying |
| CN108190909A (en) * | 2018-03-16 | 2018-06-22 | 淮阴工学院 | The method that 4A zeolites are prepared as raw material slightly soluble agent using kaolin |
| CN108190909B (en) * | 2018-03-16 | 2019-12-20 | 淮阴工学院 | Method for preparing 4A zeolite by using kaolin as raw material micro-solvent |
| CN110436473A (en) * | 2019-08-27 | 2019-11-12 | 陕西国防工业职业技术学院 | A kind of coal slime activation method for capableing of iron-removal and whitening |
| CN114804133A (en) * | 2021-05-28 | 2022-07-29 | 内蒙古先进陶瓷设计院有限公司 | Method for calcining coal-series kaolin at low temperature and application thereof |
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