CN104340982A - Production technique for preparing silica white from rice hull ash - Google Patents
Production technique for preparing silica white from rice hull ash Download PDFInfo
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- CN104340982A CN104340982A CN201410571008.3A CN201410571008A CN104340982A CN 104340982 A CN104340982 A CN 104340982A CN 201410571008 A CN201410571008 A CN 201410571008A CN 104340982 A CN104340982 A CN 104340982A
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Abstract
The invention discloses a production technique for preparing silica white from rice hull ash, which comprises the following steps: pretreating rice hull ash, preparing water glass, and preparing precipitation-process silica white. By using the rice hull ash as the raw material, the technique is low in cost, effectively utilizes the resources, and lowers the environmental pollution. The rice hull ash is baked twice, thereby enhancing the yield and purity of the product, greatly lowering copper, iron, manganese, calcium and other impurities, performing key functions on cleanness of water glass, and thus, enhancing the purity of the silica white finished product. After the slurry is filtered and washed, the filter cake is directly delivered to the rotary expansion drying machine for drying, and therefore, the coal consumption and power consumption can be respectively lowered by more than 20%.
Description
Technical field
The present invention relates to a kind of production technique utilizing rice hull ash production of silica white, belong to chemical technology field.
Background technology
Rice husk is the maximum by product in Rice producing, accounts for 18% ~ 22% of paddy kernel weight, and China is paddy rice kingdom, produce paddy per year more than 200,000,000 tons, account for 31.6% of world's paddy gross annual output amount, about 6,000 ten thousand tons, rice husk can be obtained after processing, mostly as primary fuel, comprehensive utilization ratio is less than 10%, and rice hull ash is the product of rice husk after burning and utilizing heat energy, is processed as waste, not only wasted resource, also pollute environment, also accounted for a large amount of soils simultaneously; White carbon black is a kind of auxiliary agent of environmental-protecting performance excellence, is mainly used in rubber item (comprising high-temperature silicon disulfide rubber), weaving, papermaking, agricultural chemicals, foodstuff additive field; White carbon black is divided into precipitated silica and thermal silica substantially by production method, the domestic white carbon black production of China is mainly based on the precipitator method, output is advanced by leaps and bounds for over ten years, according to precipitated silica application related industries development trend, prediction the coming five years China precipitated silica is about 10% in the average annual demand growth speed of traditional shoemaking, tire, medicine, feed, rubber item etc., has increase substantially in the demand of some emerging fields as green tire, silicon rubber, toothpaste, coating, new energy field etc.; Mostly three-stage process is adopted during existing rice husk/rice hull ash precipitated silica, through the multistage slurrying of pulper after slurry filtration washing, then slurry pipeline transport carries out drying to spray-drier, production process also exists many technical barriers, and the energy consumption in production process, secondary pollution, charcoal recovery, removal of impurities etc. constrain its development.
Summary of the invention
Object of the present invention aims to provide a kind of production technique utilizing rice hull ash production of silica white, is fully utilized rice hull ash, solves the pollution problem of a large amount of agricultural wastes, make full use of resource, improve product purity simultaneously, save coal consumption, power consumption, reduce production cost.
For achieving the above object, a kind of production technique of rice hull ash production of silica white that utilizes of the present invention comprises the following steps: rice hull ash pre-treatment-water glass processed-precipitated silica processed,
1) rice hull ash pre-treatment: rice husk is placed in roasting kiln kiln roasting and obtains rice hull ash first product, then the rice husk adding first time weight 10% carries out re-baking, obtains rice hull ash raw material;
2) water glass processed (sodium silicate solution): by 1-2t step 1) the rice hull ash raw material that obtains and 0.5-1.5t concentration is that the liquid caustic soda (sodium hydroxide solution) of 32-50% is placed in reactor and stirs, 100-170 DEG C, react under 2-7MPa condition, chemical equation is: xSiO
2+ 2nNaOH → nNa
2o.xSiO
2+ nH
2o, has reacted rear filtration, has obtained water glass;
3) precipitated silica processed: add water in synthesis reactor, stir, logical steam is warmed up to 60-100 DEG C, adding 8-20t step 2 simultaneously) water glass being mixed with 11-25% concentration that obtains and 0.2-1.2t concentration is the sulfuric acid of 45-98%, adjust ph is 4.0 ± 0.5, reaction, after slaking 0.5-1.5min, blowing enters cooling tank, Filter Press is pumped into after being cooled to normal temperature, washing, obtain filter cake, described filter cake is placed in hollander tub making beating and makes slip, by described slip after ultrasonic grinder is pulverized, be placed in Rotatingandflashstreamingdrier dry, metering packing after completing, obtain precipitated silica finished product.
A kind of production technique of rice hull ash production of silica white beneficial effect compared with the prior art that utilizes of the present invention is: 1, the present invention uses rice hull ash as raw material, with low cost, effectively make use of resource, reduces environmental pollution; 2, by the re-baking to rice hull ash, improve yield and the purity of product, the impurity such as copper, iron, manganese, calcium reduce greatly, serve keying action, also therefore improve the purity of white carbon black finished product to the cleaning of water glass; 3, after slurry filtration washing, filter cake is directly delivered to Rotatingandflashstreamingdrier and carries out drying, and therefore, coal consumption, power consumption all can reduce by more than 20%.
Embodiment
Below in conjunction with specific embodiment, a kind of production technique of rice hull ash production of silica white that utilizes of the present invention is described further.
A kind of production technique of rice hull ash production of silica white that utilizes of the present invention comprises the following steps: rice hull ash pre-treatment-water glass processed-precipitated silica processed,
1) rice hull ash pre-treatment: rice husk is placed in roasting kiln kiln roasting and obtains rice hull ash first product, then the rice husk adding first time weight 10% carries out re-baking, obtains rice hull ash raw material;
2) water glass processed (sodium silicate solution): by 1-2t step 1) the rice hull ash raw material that obtains and 0.5-1.5t concentration is that the liquid caustic soda (sodium hydroxide solution) of 32-50% is placed in reactor and stirs, 100-170 DEG C, react under 2-7MPa condition, chemical equation is: xSiO
2+ 2nNaOH → nNa
2o.xSiO
2+ nH
2o, has reacted rear filtration, has obtained water glass;
3) precipitated silica processed: add water in synthesis reactor, stir, logical steam is warmed up to 60-100 DEG C, adding 8-20t step 2 simultaneously) water glass being mixed with 11-25% concentration that obtains and 0.2-1.2t concentration is the sulfuric acid of 45-98%, adjust ph is 4.0 ± 0.5, reaction, after slaking 0.5-1.5min, blowing enters cooling tank, Filter Press is pumped into after being cooled to normal temperature, washing, obtain filter cake, described filter cake is placed in hollander tub making beating and makes slip, by described slip after ultrasonic grinder is pulverized, be placed in Rotatingandflashstreamingdrier dry, metering packing after completing, obtain precipitated silica finished product.
Embodiment 1:
Utilize a production technique for rice hull ash production of silica white, comprise the following steps:
1) rice hull ash pre-treatment: rice husk is placed in roasting kiln kiln roasting and obtains rice hull ash first product, then the rice husk adding first time weight 10% carries out re-baking, obtains rice hull ash raw material;
2) water glass processed (sodium silicate solution): by 1t step 1) the rice hull ash raw material that obtains and 0.5t concentration be 32% liquid caustic soda (sodium hydroxide solution) be placed in reactor and stir, 100 DEG C, react under 2MPa condition, chemical equation is: xSiO
2+ 2nNaOH → nNa
2o.xSiO
2+ nH
2o, has reacted rear filtration, has obtained water glass;
3) precipitated silica processed: add water in synthesis reactor, stir, logical steam is warmed up to 60 DEG C, adding 8t step 2 simultaneously) water glass being mixed with 11% concentration that obtains and 0.2t concentration is the sulfuric acid of 45%, adjust ph is 4.0 ± 0.5, reaction, after slaking 0.5min, blowing enters cooling tank, Filter Press is pumped into after being cooled to normal temperature, washing, obtain filter cake, described filter cake is placed in hollander tub making beating and makes slip, by described slip after ultrasonic grinder is pulverized, be placed in Rotatingandflashstreamingdrier dry, metering packing after completing, obtain precipitated silica finished product.
Embodiment 2:
Utilize a production technique for rice hull ash production of silica white, comprise the following steps:
1) rice hull ash pre-treatment: rice husk is placed in roasting kiln kiln roasting and obtains rice hull ash first product, then the rice husk adding first time weight 10% carries out re-baking, obtains rice hull ash raw material;
2) water glass processed (sodium silicate solution): by 2t step 1) the rice hull ash raw material that obtains and 1.5t concentration be 50% liquid caustic soda (sodium hydroxide solution) be placed in reactor and stir, 170 DEG C, react under 7MPa condition, chemical equation is: xSiO
2+ 2nNaOH → nNa
2o.xSiO
2+ nH
2o, has reacted rear filtration, has obtained water glass;
3) precipitated silica processed: add water in synthesis reactor, stir, logical steam is warmed up to 100 DEG C, adding 20t step 2 simultaneously) water glass being mixed with 25% concentration that obtains and 1.2t concentration is the sulfuric acid of 98%, adjust ph is 4.0 ± 0.5, reaction, after slaking 1.5min, blowing enters cooling tank, Filter Press is pumped into after being cooled to normal temperature, washing, obtain filter cake, described filter cake is placed in hollander tub making beating and makes slip, by described slip after ultrasonic grinder is pulverized, be placed in Rotatingandflashstreamingdrier dry, metering packing after completing, obtain precipitated silica finished product.
Embodiment 3:
Utilize a production technique for rice hull ash production of silica white, comprise the following steps:
1) rice hull ash pre-treatment: rice husk is placed in roasting kiln kiln roasting and obtains rice hull ash first product, then the rice husk adding first time weight 10% carries out re-baking, obtains rice hull ash raw material;
2) water glass processed (sodium silicate solution): by 1.5 steps 1) the rice hull ash raw material that obtains and 1t concentration be 41% liquid caustic soda (sodium hydroxide solution) be placed in reactor and stir, 135 DEG C, react under 5MPa condition, chemical equation is: xSiO
2+ 2nNaOH → nNa
2o.xSiO
2+ nH
2o, has reacted rear filtration, has obtained water glass;
3) precipitated silica processed: add water in synthesis reactor, stir, logical steam is warmed up to 80 DEG C, adding 14t step 2 simultaneously) water glass being mixed with 18% concentration that obtains and 0.7t concentration is the sulfuric acid of 76%, adjust ph is 4.0 ± 0.5, reaction, after slaking 1min, blowing enters cooling tank, Filter Press is pumped into after being cooled to normal temperature, washing, obtain filter cake, described filter cake is placed in hollander tub making beating and makes slip, by described slip after ultrasonic grinder is pulverized, be placed in Rotatingandflashstreamingdrier dry, metering packing after completing, obtain precipitated silica finished product.
The precipitated silica finished product that above embodiment obtains, all reaches following technical indicator:
Dioxide-containing silica is greater than 96.5%; Screenings (45um) is less than 0.12%; Burning decrement is less than 3.2%; Total copper content is less than 0.6mg/kg; Total manganese content is less than 0.8mg/kg; Total iron-holder is less than 45.3mg/kg; DBP absorption value 3.4ml/g; CTAB adsorption specific surface area 161m
2/ g; Arsenic (As) content % < 0.0001; Heavy metal content % < 0.0001.Apparent density 0.2-0.3g/ml.
Claims (4)
1. utilize a production technique for rice hull ash production of silica white, comprise the following steps: rice hull ash pre-treatment-water glass processed-precipitated silica processed, is characterized in that
(1) rice hull ash pre-treatment: rice husk is placed in roasting kiln kiln roasting and obtains rice hull ash first product, then the rice husk adding first time weight 10% carries out re-baking, obtains rice hull ash raw material;
(2) water glass processed (sodium silicate solution): by 1-2t step 1) the rice hull ash raw material that obtains and 0.5-1.5t concentration is that the liquid caustic soda (sodium hydroxide solution) of 32-50% is placed in reactor and stirs, 100-170 DEG C, react under 2-7MPa condition, chemical equation is: xSiO
2+ 2nNaOH → nNa
2o.xSiO
2+ nH
2o, has reacted rear filtration, has obtained water glass;
(3) precipitated silica processed: add water in synthesis reactor, stir, logical steam is warmed up to 60-100 DEG C, adding 8-20t step 2 simultaneously) water glass being mixed with 11-25% concentration that obtains and 0.2-1.2t concentration is the sulfuric acid of 45-98%, adjust ph is 4.0 ± 0.5, reaction, after slaking 0.5-1.5min, blowing enters cooling tank, Filter Press is pumped into after being cooled to normal temperature, washing, obtain filter cake, described filter cake is placed in hollander tub making beating and makes slip, by described slip after ultrasonic grinder is pulverized, be placed in Rotatingandflashstreamingdrier dry, metering packing after completing, obtain precipitated silica finished product.
2. the production technique utilizing rice hull ash production of silica white according to claim 1, is characterized in that
(1) rice hull ash pre-treatment: rice husk is placed in roasting kiln kiln roasting and obtains rice hull ash first product, then the rice husk adding first time weight 10% carries out re-baking, obtains rice hull ash raw material;
(2) water glass processed (sodium silicate solution): by 1t step 1) the rice hull ash raw material that obtains and 0.5t concentration be 32% liquid caustic soda (sodium hydroxide solution) be placed in reactor and stir, 100 DEG C, react under 2MPa condition, chemical equation is: xSiO
2+ 2nNaOH → nNa
2o.xSiO
2+ nH
2o, has reacted rear filtration, has obtained water glass;
(3) precipitated silica processed: add water in synthesis reactor, stir, logical steam is warmed up to 60 DEG C, adding 8t step 2 simultaneously) water glass being mixed with 11% concentration that obtains and 0.2t concentration is the sulfuric acid of 45%, adjust ph is 4.0 ± 0.5, reaction, after slaking 0.5min, blowing enters cooling tank, Filter Press is pumped into after being cooled to normal temperature, washing, obtain filter cake, described filter cake is placed in hollander tub making beating and makes slip, by described slip after ultrasonic grinder is pulverized, be placed in Rotatingandflashstreamingdrier dry, metering packing after completing, obtain precipitated silica finished product.
3. the production technique utilizing rice hull ash production of silica white according to claim 1, is characterized in that
(1) rice hull ash pre-treatment: rice husk is placed in roasting kiln kiln roasting and obtains rice hull ash first product, then the rice husk adding first time weight 10% carries out re-baking, obtains rice hull ash raw material;
(2) water glass processed (sodium silicate solution): by 2t step 1) the rice hull ash raw material that obtains and 1.5t concentration be 50% liquid caustic soda (sodium hydroxide solution) be placed in reactor and stir, 170 DEG C, react under 7MPa condition, chemical equation is: xSiO
2+ 2nNaOH → nNa
2o.xSiO
2+ nH
2o, has reacted rear filtration, has obtained water glass;
(3) precipitated silica processed: add water in synthesis reactor, stir, logical steam is warmed up to 100 DEG C, adding 20t step 2 simultaneously) water glass being mixed with 25% concentration that obtains and 1.2t concentration is the sulfuric acid of 98%, adjust ph is 4.0 ± 0.5, reaction, after slaking 1.5min, blowing enters cooling tank, Filter Press is pumped into after being cooled to normal temperature, washing, obtain filter cake, described filter cake is placed in hollander tub making beating and makes slip, by described slip after ultrasonic grinder is pulverized, be placed in Rotatingandflashstreamingdrier dry, metering packing after completing, obtain precipitated silica finished product.
4. the production technique utilizing rice hull ash production of silica white according to claim 1, is characterized in that
(1) rice hull ash pre-treatment: rice husk is placed in roasting kiln kiln roasting and obtains rice hull ash first product, then the rice husk adding first time weight 10% carries out re-baking, obtains rice hull ash raw material;
(2) water glass processed (sodium silicate solution): by 1.5 steps 1) the rice hull ash raw material that obtains and 1t concentration be 41% liquid caustic soda (sodium hydroxide solution) be placed in reactor and stir, 135 DEG C, react under 5MPa condition, chemical equation is: xSiO
2+ 2nNaOH → nNa
2o.xSiO
2+ nH
2o, has reacted rear filtration, has obtained water glass;
(3) precipitated silica processed: add water in synthesis reactor, stir, logical steam is warmed up to 80 DEG C, adding 14t step 2 simultaneously) water glass being mixed with 18% concentration that obtains and 0.7t concentration is the sulfuric acid of 76%, adjust ph is 4.0 ± 0.5, reaction, after slaking 1min, blowing enters cooling tank, Filter Press is pumped into after being cooled to normal temperature, washing, obtain filter cake, described filter cake is placed in hollander tub making beating and makes slip, by described slip after ultrasonic grinder is pulverized, be placed in Rotatingandflashstreamingdrier dry, metering packing after completing, obtain precipitated silica finished product.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107697920A (en) * | 2017-11-21 | 2018-02-16 | 安徽伊法拉电气有限公司 | A kind of method that hydrophobic nano white carbon is prepared using sol-gal process |
| CN107720766A (en) * | 2017-10-12 | 2018-02-23 | 中昊黑元化工研究设计院有限公司 | A kind of method of rice hull ash dry production sodium polysilicate |
| CN109437213A (en) * | 2018-12-10 | 2019-03-08 | 四川绿沃创新环保工程有限公司 | A kind of process for reclaiming producing white carbon black using rice hull ash as raw material |
| CN109911904A (en) * | 2019-03-20 | 2019-06-21 | 高铭鸿 | A kind for the treatment of process preparing new material using the reclaiming energy |
| CN110305519A (en) * | 2019-06-12 | 2019-10-08 | 王银梅 | A kind of preparation method of high grade of transparency flatting silica |
| CN110526252A (en) * | 2019-10-16 | 2019-12-03 | 广西马中粮油有限公司 | The method of rice husk coproduction waterglass, white carbon black and active carbon |
| CN110562992A (en) * | 2019-10-16 | 2019-12-13 | 广西马中粮油有限公司 | Method for producing rubber reinforcing agent by using rice husk as raw material |
| CN111573681A (en) * | 2020-04-07 | 2020-08-25 | 南昌航空大学 | White carbon black polymer coating modification method |
| CN111704143A (en) * | 2020-03-06 | 2020-09-25 | 宣全 | Production process for preparing composite calcium silicate by using rice hull ash |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107720766A (en) * | 2017-10-12 | 2018-02-23 | 中昊黑元化工研究设计院有限公司 | A kind of method of rice hull ash dry production sodium polysilicate |
| CN107697920A (en) * | 2017-11-21 | 2018-02-16 | 安徽伊法拉电气有限公司 | A kind of method that hydrophobic nano white carbon is prepared using sol-gal process |
| CN109437213A (en) * | 2018-12-10 | 2019-03-08 | 四川绿沃创新环保工程有限公司 | A kind of process for reclaiming producing white carbon black using rice hull ash as raw material |
| CN109911904A (en) * | 2019-03-20 | 2019-06-21 | 高铭鸿 | A kind for the treatment of process preparing new material using the reclaiming energy |
| CN109911904B (en) * | 2019-03-20 | 2021-11-02 | 高铭鸿 | Treatment process for preparing new material by utilizing recycled renewable energy |
| CN110305519A (en) * | 2019-06-12 | 2019-10-08 | 王银梅 | A kind of preparation method of high grade of transparency flatting silica |
| CN110526252A (en) * | 2019-10-16 | 2019-12-03 | 广西马中粮油有限公司 | The method of rice husk coproduction waterglass, white carbon black and active carbon |
| CN110562992A (en) * | 2019-10-16 | 2019-12-13 | 广西马中粮油有限公司 | Method for producing rubber reinforcing agent by using rice husk as raw material |
| CN110562992B (en) * | 2019-10-16 | 2022-12-06 | 广西马中粮油有限公司 | Method for producing rubber reinforcing agent by using rice husk as raw material |
| CN111704143A (en) * | 2020-03-06 | 2020-09-25 | 宣全 | Production process for preparing composite calcium silicate by using rice hull ash |
| CN111573681A (en) * | 2020-04-07 | 2020-08-25 | 南昌航空大学 | White carbon black polymer coating modification method |
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Application publication date: 20150211 |