CN103172094A - Method for using waste aluminum ash and waste acid without causing pollution to environment - Google Patents
Method for using waste aluminum ash and waste acid without causing pollution to environment Download PDFInfo
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- CN103172094A CN103172094A CN2013100875437A CN201310087543A CN103172094A CN 103172094 A CN103172094 A CN 103172094A CN 2013100875437 A CN2013100875437 A CN 2013100875437A CN 201310087543 A CN201310087543 A CN 201310087543A CN 103172094 A CN103172094 A CN 103172094A
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Abstract
The invention discloses a method for using waste aluminum ash and waste acid without causing pollution to environment. The method comprises the following steps of: (1) preparing the 10-30% waste acid: (2) taking the waste aluminum ash, slowly adding the waste aluminum ash into the waste acid prepared in the step (1), and heating the waste acid in a water bath at the temperature of 80 DEG C for 3 hours while stirring slowly, wherein the solid-liquid volume ratio of the waste aluminum ash to the waste acid is 1-5; (3) carrying out reaction, and filtering while the product of reaction is hot to obtain a filter residue and a filtrate; and (4) adjusting the pH value of the filtrate to 12 by using an excess amount of NaOH, and standing for filtration to obtain an iron-containing filter residue and an aluminum-containing filtrate, washing NaOH precipitates repeatedly, drying, and calcining at a high temperature to obtain a NaOH product. Due to the adoption of the method, the wastes can be treated, and the waste of resources can be avoided. The method conforms to the concept of the circular economy and the concept of energy conservation and emission reduction.
Description
Technical field
The present invention utilizes the aluminium lime-ash different with the solubility rate of spent acid under different acidity, solid-to-liquid ratio, temperature condition, through repetition test repeatedly, and the highest technique of digesting efficiency of alumina that draws.This invention is through the processes such as a series of dissolving, filtration, ignition of precipitate, the highly purified aluminum oxide of output and iron oxide pigment.
Background technology
The higher flyash of aluminum content that produces at the boiler that reclaims metallic aluminium and smelt the aluminium lime-ash that produces and various fire coals at present all carries out waste treatment, not only occupies the forest land, contaminate environment, and the resource that contains in a large number aluminium is wasted.And iron and steel surface cleaning factory common acid leaching method is removed the iron rust on top layer, acid solution do not have cleanup action after concentration drops to a certain degree after is processed as spent acid, this spent acid solution contains a large amount of iron ions, present processing is mainly also by methods such as neutralization precipitations, not only waste resource, and produce a large amount of body refuses.
Summary of the invention
In order to overcome the deficiencies in the prior art, the invention provides a kind of method that environmental protection utilizes aluminium scrap lime-ash and spent acid, step is as follows:
1) mass percent concentration of preparation spent acid is 10 ~ 30%;
2) get aluminium scrap ash ground-slag, slowly join the spent acid of preparing in step 1), 80 ℃ of heating in water bath 3 hours slowly stirred between heating period; Described aluminium scrap ash ground-slag: spent acid, solid-liquid volume ratio are 1 ~ 5;
3) filter while hot after having reacted, obtain filter residue and filtrate;
4) with excessive NaOH, the pH of filtrate is transferred to 12, standing suction filtration obtains the iron content filter residue and contains aluminium filtrate, after iron content filter residue calcination washing ferric oxide;
5) will contain aluminium filtrate and transfer pH to 7 ~ 8 with concentrated hydrochloric acid, standing 1 hour, filter, obtain aluminum hydroxide precipitation, this aluminum hydroxide precipitation is rinsed repeatedly, obtain alumina product after the oven dry high-temperature calcination.
Spent acid in described step 1) is the spent acid (iron and steel surface cleaning factory common acid leaching method is removed the iron rust on top layer, and the acid solution do not have cleanup action after concentration drops to a certain degree after is processed as spent acid) after iron and steel cleans.
Described step 2) aluminium scrap in ash ground-slag is aluminium casting mold factory waste aluminium ash, and containing aluminium element content is 15%～35%, the silver gray fine powder.
The mass percent concentration of the spent acid described 1) is 20%, described step 2) middle aluminium scrap ash ground-slag: spent acid solid-liquid volume ratio is 1:4.
Filter residue main component in described step 3) is silicon-dioxide, as refractory brick material, cement or pavior.
Red iron oxide in described step 4) is as pigment.
Beneficial effect of the present invention: the present invention has not only processed waste and has also avoided the waste of resource, and meets the theory of recycling economy and energy-saving and emission-reduction.
Description of drawings
Fig. 1 is the method flow diagram that environmental protection utilizes aluminium scrap lime-ash and spent acid.
Fig. 2 is alumina product.
Fig. 3 is ferric oxide red colorant.
Embodiment
The present invention is described further below in conjunction with the drawings and specific embodiments.The present invention is directed in aluminium scrap ash ground-slag or flyash aluminium and compounds content thereof higher, clean acid-spending strength from iron and steel and be about 5%～8%, contain simultaneously a large amount of iron ions.Utilize two kinds of waste materials can produce two kinds of industrial chemicals ferric oxide and aluminum oxide, turn waste into wealth.Not high enough because of acid-spending strength, add a small amount of hydrochloric acid in experiment, dissolving aluminium scrap ash, wherein aluminum oxide is extracted, and aluminium and compound thereof are transformed into aluminium salt, cross to filter to remove filter residue, filtrate adds alkali to be made aluminium be transformed into meta-aluminate to enter solution, and the iron in spent acid becomes Fe (OH)
2Precipitation, after secondary filtration, filtrate acid adding adjust pH becomes Al (OH)
3The calcination after washing of Precipitation, precipitation gets pure Al
2O
3Precipitation Fe after secondary filtration (OH)
2Get croci through calcination, this powder can be done ferric oxide red colorant, and concrete technological line schema is seen Fig. 1.
Embodiment 1
Concrete steps are as follows:
One, 15% acid solution
1, the spent acid of getting 50ml adds the 30ml concentrated hydrochloric acid, is mixed with acidity and is 15% acid solution.
2, get 2g aluminium scrap ash ground-slag, add than slowly the acid solution of preparing in 1 by the 1:4 solid waste, 80 ℃ of heating in water bath 2h,, slowly stir between heating period.
3, filter while hot, filter residue is as materials such as refractory brick, and filtrate mensuration finds that the aluminium solubility rate is 65 ~ 70%.
4, the pH with filtrate transfers to 12 left and right, standing filtration, and filter residue is mainly ferrous hydroxide, gets the ferric oxide (see figure 3) after filter residue calcination washing, is used for doing pigment.Filtrate is carried out next step operation.
5, filtrate is transferred pH to 7 ~ 8, and standing 1h filters, and obtains aluminum hydroxide precipitation, and this precipitation is rinsed repeatedly, can obtain the alumina product (see figure 2) after oven dry.
Embodiment 2
Concrete steps are as follows:
One, 20% acid solution
1, the spent acid of getting 50ml adds appropriate industrial concentrated hydrochloric acid, is mixed with acidity and is 20% acid solution.
2, get 2g aluminium scrap ash ground-slag, add than slowly the acid solution of preparing in 1 by the 1:4 solid waste, 80 ℃ of heating in water bath 2h,, slowly stir between heating period.
3, filter while hot, filter residue is as materials such as refractory brick, and filtrate mensuration finds that the aluminium solubility rate is 70 ~ 75%.
4, the pH with filtrate transfers to 12 left and right, standing filtration, and filter residue is mainly ferrous hydroxide, gets ferric oxide after filter residue calcination washing, is used for doing pigment.Filtrate is carried out next step operation.
5, filtrate is transferred pH to 7 ~ 8, and standing 1h filters, and obtains aluminum hydroxide precipitation, and this precipitation is rinsed repeatedly, can obtain alumina product after oven dry.
Embodiment 3
Concrete steps are as follows:
One, 25% acid solution
1, the spent acid of getting 50ml adds 30ml industry concentrated hydrochloric acid, is mixed with acidity and is 25% acid solution.
2, get 2g aluminium scrap ash ground-slag, add than slowly the acid solution of preparing in 1 by the 1:4 solid waste, 80 ℃ of heating in water bath 2h slowly stirred between heating period.
3, filter while hot, filter residue is as materials such as refractory brick, and filtrate mensuration finds that the aluminium solubility rate is 70 ~ 75%.
4, the pH with filtrate transfers to 12 left and right, standing filtration, and filter residue is mainly ferrous hydroxide, gets ferric oxide after filter residue calcination washing, is used for doing pigment.Filtrate is carried out next step operation.
5, filtrate is transferred pH to 7 ~ 8, and standing 1h filters, and obtains aluminum hydroxide precipitation, and this precipitation is rinsed repeatedly, can obtain alumina product after oven dry.
Our technique mainly adopt for pickling process, the filter residue after acidleach is as heat-stable material, littlely even can avoid further deslagging.Be mainly spent acid with acid in this technique, thereby lowered production cost, this technological operation simultaneously is simple, is applicable to industrial mass production.
Claims (6)
1. an environmental protection utilizes the method for aluminium scrap lime-ash and spent acid, it is characterized in that, its step is as follows:
1) mass percent concentration of preparation spent acid is 10 ~ 30%;
2) get aluminium scrap ash ground-slag, slowly join the spent acid of preparing in step 1), 80 ℃ of heating in water bath 3 hours slowly stirred between heating period; Described aluminium scrap ash ground-slag: spent acid, solid-liquid volume ratio are 1 ~ 5;
3) filter while hot after having reacted, obtain filter residue and filtrate;
4) with excessive NaOH, the pH of filtrate is transferred to 12, standing suction filtration obtains the iron content filter residue and contains aluminium filtrate, after iron content filter residue calcination washing ferric oxide;
5) will contain aluminium filtrate and transfer pH to 7 ~ 8 with concentrated hydrochloric acid, standing 1 hour, filter, obtain aluminum hydroxide precipitation, this aluminum hydroxide precipitation is rinsed repeatedly, obtain alumina product after the oven dry high-temperature calcination.
2. environmental protection as claimed in claim 1 utilizes the method for aluminium scrap lime-ash and spent acid, it is characterized in that, the spent acid in described step 1) is the spent acid after iron and steel cleans.
3. environmental protection as claimed in claim 1 utilizes the method for aluminium scrap lime-ash and spent acid, it is characterized in that described step 2) in aluminium scrap ash ground-slag be aluminium casting mold factory waste aluminium ash, containing aluminium element content is 15%～35%
,The silver gray fine powder.
4. environmental protection as claimed in claim 1 utilizes the method for aluminium scrap lime-ash and spent acid, it is characterized in that described 1) in the mass percent concentration of spent acid be 20%; Described step 2) aluminium scrap ash ground-slag in: spent acid solid-liquid volume ratio is 1:4.
5. environmental protection as claimed in claim 1 utilizes the method for aluminium scrap lime-ash and spent acid, it is characterized in that, the filter residue main component in described step 3) is silicon-dioxide, as refractory brick material, cement or pavior.
6. environmental protection as claimed in claim 1 utilizes the method for aluminium scrap lime-ash and spent acid, it is characterized in that, the red iron oxide in described step 4) is as pigment.
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| CN2013100875437A CN103172094A (en) | 2013-03-19 | 2013-03-19 | Method for using waste aluminum ash and waste acid without causing pollution to environment |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103435079A (en) * | 2013-09-04 | 2013-12-11 | 化工部长沙设计研究院 | Technology for producing aluminium oxide by decomposing mineral containing aluminosilicate at low temperature |
| CN104828915A (en) * | 2015-04-14 | 2015-08-12 | 贺州学院 | Method for synthesizing polyaluminum sulfate chloride water purifier by using aluminum foil corrosion waste acid and waste aluminum |
| CN106478020A (en) * | 2016-10-10 | 2017-03-08 | 浙江师范大学 | A kind of use waste aluminium lime-ash prepares non-burning brick method |
| CN106694514A (en) * | 2016-12-05 | 2017-05-24 | 三门峡华森新型材料商贸有限公司 | Resourceful treatment method for aluminum ash |
| CN106745130A (en) * | 2017-01-11 | 2017-05-31 | 西北农林科技大学 | A kind of method that aluminium lime-ash prepares aluminum oxide |
| CN106830025A (en) * | 2017-02-24 | 2017-06-13 | 南通大学 | aluminium ash recycling method |
| CN106865586A (en) * | 2017-02-24 | 2017-06-20 | 西北农林科技大学 | A kind of method for preparing alumina type aeroge |
| CN106892441A (en) * | 2017-02-24 | 2017-06-27 | 南通大学 | Aluminium ash Application way |
| CN109987639A (en) * | 2019-03-22 | 2019-07-09 | 昆明理工大学 | A kind of method that aluminium strengthens red mud dealkalization and separates and recovers aluminium, iron |
| CN110436498A (en) * | 2019-08-09 | 2019-11-12 | 湖北新金洋资源股份公司 | The method of high purity aluminium oxide is recycled in a kind of Quadratic aluminum dust of secondary aluminium melting end |
| CN110526268A (en) * | 2019-03-26 | 2019-12-03 | 河南科技大学 | A kind of recycling aluminium electroloysis aluminium ash preparation α-Al2O3Method |
| CN111017970A (en) * | 2019-12-26 | 2020-04-17 | 西北农林科技大学 | Method for extracting aluminum oxide from secondary aluminum ash |
| CN111547751A (en) * | 2020-05-29 | 2020-08-18 | 西北农林科技大学 | Method for preparing porous alumina by using solid waste |
| CN112553470A (en) * | 2020-12-08 | 2021-03-26 | 广西博世科环保科技股份有限公司 | Method for recovering aluminum hydroxide powder by using titanium dioxide waste acid and secondary aluminum ash |
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Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103435079A (en) * | 2013-09-04 | 2013-12-11 | 化工部长沙设计研究院 | Technology for producing aluminium oxide by decomposing mineral containing aluminosilicate at low temperature |
| CN103435079B (en) * | 2013-09-04 | 2015-03-18 | 化工部长沙设计研究院 | Technology for producing aluminium oxide by decomposing mineral containing aluminosilicate at low temperature |
| CN104828915A (en) * | 2015-04-14 | 2015-08-12 | 贺州学院 | Method for synthesizing polyaluminum sulfate chloride water purifier by using aluminum foil corrosion waste acid and waste aluminum |
| CN106478020A (en) * | 2016-10-10 | 2017-03-08 | 浙江师范大学 | A kind of use waste aluminium lime-ash prepares non-burning brick method |
| CN106694514A (en) * | 2016-12-05 | 2017-05-24 | 三门峡华森新型材料商贸有限公司 | Resourceful treatment method for aluminum ash |
| CN106694514B (en) * | 2016-12-05 | 2019-01-29 | 三门峡华森新型材料商贸有限公司 | A kind of aluminium ash recycling processing method |
| CN106745130A (en) * | 2017-01-11 | 2017-05-31 | 西北农林科技大学 | A kind of method that aluminium lime-ash prepares aluminum oxide |
| CN106892441A (en) * | 2017-02-24 | 2017-06-27 | 南通大学 | Aluminium ash Application way |
| CN106865586A (en) * | 2017-02-24 | 2017-06-20 | 西北农林科技大学 | A kind of method for preparing alumina type aeroge |
| CN106830025B (en) * | 2017-02-24 | 2018-06-19 | 南通大学 | aluminium ash recycling method |
| CN106865586B (en) * | 2017-02-24 | 2018-07-06 | 西北农林科技大学 | A kind of method for preparing alumina type aeroge |
| CN106830025A (en) * | 2017-02-24 | 2017-06-13 | 南通大学 | aluminium ash recycling method |
| CN109987639A (en) * | 2019-03-22 | 2019-07-09 | 昆明理工大学 | A kind of method that aluminium strengthens red mud dealkalization and separates and recovers aluminium, iron |
| CN109987639B (en) * | 2019-03-22 | 2021-07-02 | 昆明理工大学 | Method for dealkalizing aluminum-reinforced red mud and separating and recovering aluminum and iron |
| CN110526268A (en) * | 2019-03-26 | 2019-12-03 | 河南科技大学 | A kind of recycling aluminium electroloysis aluminium ash preparation α-Al2O3Method |
| CN110436498A (en) * | 2019-08-09 | 2019-11-12 | 湖北新金洋资源股份公司 | The method of high purity aluminium oxide is recycled in a kind of Quadratic aluminum dust of secondary aluminium melting end |
| CN111017970A (en) * | 2019-12-26 | 2020-04-17 | 西北农林科技大学 | Method for extracting aluminum oxide from secondary aluminum ash |
| CN111547751A (en) * | 2020-05-29 | 2020-08-18 | 西北农林科技大学 | Method for preparing porous alumina by using solid waste |
| CN112553470A (en) * | 2020-12-08 | 2021-03-26 | 广西博世科环保科技股份有限公司 | Method for recovering aluminum hydroxide powder by using titanium dioxide waste acid and secondary aluminum ash |
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Application publication date: 20130626 |