CN103214040A - Comprehensive utilization method of rice hull ash - Google Patents
Comprehensive utilization method of rice hull ash Download PDFInfo
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- CN103214040A CN103214040A CN 201310143665 CN201310143665A CN103214040A CN 103214040 A CN103214040 A CN 103214040A CN 201310143665 CN201310143665 CN 201310143665 CN 201310143665 A CN201310143665 A CN 201310143665A CN 103214040 A CN103214040 A CN 103214040A
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- hull ash
- rice hull
- rice
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- filter cake
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Abstract
The three northeast provinces of China produce rice with an annual output of 5 billion kg, 15% of rice is rice hulls, and about 15% of rice hull ash is generated after the rice hulls are combusted, therefore, 112.5 million kg of rice hull ash can be generated after the rice hulls are combusted; the rice hull ash contains 56% of silica, 30% of alumina, 4.6% of ferric oxide, 3.5% of potassium hydroxide and 3.4% of calcium oxide; and once the rice hull ash is piled up everywhere, the rice hull ash occupies land, and because alkaline oxides contained in the rice hull ash become alkaline after meeting water, thereby contaminating water supplies. Aluminum hydroxide is obtained through carrying out magnetic separation, alkaline washing, alumina removal by washing, and dilution on the rice hull ash, potassium hydroxide is prepared through concentrating liquid, and calcium oxide is removed through acid-washing by using hydrochloric acid; and calcium chloride is prepared through concentrating, and the rest is silicon dioxide. Through the method, five chemical raw materials including ferric oxide, aluminum hydroxide, potassium hydroxide, calcium chloride and silica are separated from the rice hull ash, so that the comprehensive utilization of the rice hull ash is realized. Both an effect of protecting the environment and an effect of generating economic benefits are achieved.
Description
Technical field
What the present invention proposed is the rice hull ash comprehensive utilization method.
Background technology
5,000,000,000 kilograms in paddy rice is produced in the Three Eastern Provinces per year, paddy rice have 15% be rice husk, rice husk burning back produces 15% left and right sides rice hull ash.Can generate 1.125 hundred million kilograms of rice hull ash after these rice husk burnings, contain silicon-dioxide 56% in the rice hull ash, aluminum oxide 30%, ferric oxide 4.6%.Potassium oxide 3.5% and calcium oxide 3.4%, rice hull ash is stacked not only land occupation everywhere, and its contained basic oxide runs into water can become alkali, also can polluted source.
Through magnetic separation, alkali cleaning, flush away aluminum oxide, dilution obtains aluminium hydroxide rice hull ash for we, and liquid concentration obtains potassium hydroxide, chlorohydric acid pickling flush away calcium oxide.Concentrate and obtain calcium chloride, remaining is silicon-dioxide.Through aforesaid method rice hull ash is isolated ferric oxide, aluminium hydroxide, potassium hydroxide, calcium chloride and five kinds of industrial chemicals of silicon-dioxide, make rice hull ash obtain comprehensive utilization.It has not only protected environment to produce economic benefit again.
Summary of the invention
The present invention proposes be with rice hull ash through magnetic separation, screening, pulverizing, alkali cleaning, dilution, pickling, concentrate, operation such as crystallization, separate obtaining ferric oxide, aluminium hydroxide, potassium hydroxide, calcium chloride and five kinds of industrial chemicals of silicon-dioxide, concrete scheme of the present invention is:
The magnetic separation operation of rice hull ash
Ferric oxide is isolated in the rice hull ash magnetic separation.
The screening of rice hull ash, pulverizing process
Rice hull ash is crossed 180 order sub-sieves, and 5% is unsanctioned till pulverizing reaches 180 orders.
Alkali cleaning, filtration, washing step
Above-mentioned rice husk ashes is mixed stirring with 10% sodium hydroxide, and the mass ratio of sodium hydroxide and rice hull ash is 3:1, makes alumina dissolution enter liquid phase, filters, and water cleans filter cake, makes its pH=7.5.
Dilution, filtration operation
The aforesaid liquid thin up is filtered till fully to aluminum hydroxide precipitation, and filter cake is an aluminium hydroxide, and concentrating filter liquor gets potassium hydroxide.
Pickling, washing step
Filter cake after the washing with 3mol/L salt acid elution, is washed filter cake and obtained silicon-dioxide.
Concentrated, Crystallization Procedure
The aforesaid liquid heating is concentrated, and crystallisation by cooling obtains calcium chloride.
Description of drawings
Fig. 1 is a rice hull ash comprehensive utilization method process flow chart of the present invention
Embodiment
The magnetic separation operation of rice hull ash
Rice hull ash is isolated ferric oxide by the standing field magnetic separation.
The screening of rice hull ash, pulverizing process
With 180 order sub-sieves screening rice hull ash, 5% is unsanctioned till pulverizing reaches 180 orders.
Alkali cleaning, filtration, washing step
Above-mentioned 100 gram rice husk ashes are mixed stirring with 10% sodium hydroxide, 300 grams, make the dissolving of aluminum oxide and potassium oxide enter liquid phase, filter, water cleans filter cake, makes its pH=7.5.
Dilution, filtration operation
The aforesaid liquid thin up is filtered till fully to aluminum hydroxide precipitation, and filter cake is an aluminium hydroxide, and concentrating filter liquor gets potassium hydroxide.
Pickling, filtration operation
Filter cake after the washing with the 100 gram washings of 3mol/L hydrochloric acid, is filtered, and filter cake is a silicon-dioxide.
Concentrated, Crystallization Procedure
Above-mentioned filtrate heating is concentrated, and crystallisation by cooling obtains calcium chloride.
Claims (6)
1. the magnetic separation operation of rice hull ash
Ferric oxide is isolated in the rice hull ash magnetic separation.
2. the screening of rice hull ash, pulverizing process
Rice hull ash is crossed 180 order sub-sieves, and 5% is unsanctioned till pulverizing reaches 180 orders.
3. alkali cleaning, filtration, washing step
Above-mentioned rice husk ashes is mixed stirring with 10% sodium hydroxide, and the mass ratio of sodium hydroxide and rice hull ash is 3:1, makes alumina dissolution enter liquid phase, filters, and water cleans filter cake, makes its pH=7.5.
4. dilution, filtration operation
Above-mentioned filtrate thin up is filtered till fully to aluminum hydroxide precipitation, and filter cake is an aluminium hydroxide, and concentrating filter liquor gets potassium hydroxide.
5. pickling, washing step
Filter cake after the washing with 3mol/L salt acid elution, is washed filter cake and obtained silicon-dioxide.
6. concentrated, Crystallization Procedure
The aforesaid liquid heating is concentrated, and crystallisation by cooling obtains calcium chloride.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201310143665 CN103214040A (en) | 2013-04-24 | 2013-04-24 | Comprehensive utilization method of rice hull ash |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201310143665 CN103214040A (en) | 2013-04-24 | 2013-04-24 | Comprehensive utilization method of rice hull ash |
Publications (1)
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| CN103214040A true CN103214040A (en) | 2013-07-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN 201310143665 Pending CN103214040A (en) | 2013-04-24 | 2013-04-24 | Comprehensive utilization method of rice hull ash |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110724356A (en) * | 2019-09-26 | 2020-01-24 | 安徽自动化仪表有限公司 | Preparation method of polymer alloy plastic cable bridge |
-
2013
- 2013-04-24 CN CN 201310143665 patent/CN103214040A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110724356A (en) * | 2019-09-26 | 2020-01-24 | 安徽自动化仪表有限公司 | Preparation method of polymer alloy plastic cable bridge |
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Application publication date: 20130724 |