CN106315634A - Method for preparing sodium aluminate from aluminum scruff ash - Google Patents
Method for preparing sodium aluminate from aluminum scruff ash Download PDFInfo
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- CN106315634A CN106315634A CN201510351927.4A CN201510351927A CN106315634A CN 106315634 A CN106315634 A CN 106315634A CN 201510351927 A CN201510351927 A CN 201510351927A CN 106315634 A CN106315634 A CN 106315634A
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Abstract
The invention relates to a harmless and recycling treatment method of aluminum ash. The method is also a method for preparing sodium aluminate from aluminum scruff ash, and belongs to the technical field of waste residue treatment and environment protection. The method provided by the invention comprises the following process steps: performing ammonia removal treatment on aluminum scruff ash, performing dehydration, adding NaOH for alkalization, adding a proper amount of deionized water, and leaching out a coarse sodium aluminate solution at 65-100 DEG C; performing filter pressing so as to obtain refined sodium aluminate liquid; adjusting the molecular ratio of Na2O to Al2O3 to be 1.2-1.6 by using 10% NaOH so as to obtain a stable sodium aluminate saturated solution, finally heating the stable sodium aluminate saturated solution to be 130-150 DEG C, and removing water, thereby obtaining anhydrous sodium aluminate crystal. The method provided by the invention is simple and convenient in process, low in production cost, capable of achieving harmless and recycling treatment of aluminum ash, and beneficial to environment protection.
Description
Technical field
A kind of method that the present invention relates to preparing sodium aluminate from waste aluminium ash, is also the innoxious and recycling processing method of a kind of aluminum ash, belongs to Solid state fermentation environmental protection technical field.
Background technology
Containing harmful substances such as zinc peroxides in aluminum ash, belong to hazardous waste, if producing corporate boss's ferrous metal smelting and rolling processing industry of aluminum slag, non-ferrous metal metallurgy and calendering processing industry.Aluminum Slag treatment mainly used the manual method smelted of local method to extract metallic aluminium in the past, and the aluminum ash of remaining 90% is delivered to other enterprises and done the raw material of cleanser or fill on the spot.Owing to aluminum ash containing substantial amounts of harmful substance, irrational recycling or process, all serious secondary pollution will be caused to environment.At present, Shanghai has had new development in terms of aluminum Slag treatment, Shanghai Xin Ge non-ferrous metal company limited provides funds 15,000,000 yuan to have built up and year processes the aluminum slag disposal system of more than 8 tons, after system installation, can reclaim unified for the aluminum slag of District of Shanghai, it is uniformly processed, so will be greatly improved disposal ability and decrease secondary pollution.But, aluminum slag is after magnetic separation, ball milling, screening, annual also can produce the granularity of the nearly 10,000 tons aluminum ash below 100 mesh, how aluminum ash the most safely, is reasonably acted upon and with environmentally friendly carry out recycling, this will become problem in the urgent need to address.
The method processing aluminum ash the most both at home and abroad is mainly method of chemical treatment and physical treatment process.
Method of chemical treatment is mainly with hydrochloric acid or sulfuric acid treatment aluminum ash so that it is in aluminum dissolution, be subsequently adding organic additive and carry out polyreaction, make aluminium polychlorid or polyaluminium sulfate.Polyaluminium sulfate is flocculant conventional in water treatment field.
Physical treatment process is that aluminum ash is made together with other materials building or fire-resistant brick.Generally requiring high temperature sintering during making ceramic tile or refractory brick, due to complicated component in aluminum ash, so the ceramic tile made or refractory brick often produce a large amount of pore, its physical and chemical index is extremely difficult to use requirement.Aluminum ash another one utilization ways is after pretreatment, then through high temperature sintering, makes Alpha-alumina, and can be fired into micropore ceramics filtrate after adding dispensing further.But this method is the highest due to complex process, equipment investment, the most applicable.
Summary of the invention
An object of the present invention is to provide a kind of innoxious and method of recycling treatment to aluminium scrap ash.The two of the purpose of the present invention are to provide a kind of method of preparing sodium aluminate from waste aluminium ash.
The present invention is a kind of method of preparing sodium aluminate from waste aluminium ash, it is characterised in that have following technical process and a step:
A () removes ammonia treatment: adding appropriate dilute hydrochloric acid in aluminium scrap ash, keeping its pH value is 5～7；It is heated to 80～100 DEG C and keeps seething with excitement 2～3 hours, making the nitride in aluminum ash be fully converted into ammonia and be removed, Ammonia recovery；
(b) processed: except the aluminum ash after ammonia carries out dehydration extremely aqueous ＜ 5%；
(c) basification: add NaOH in aluminum ash after dewatering, and stir；
D () leaches: add appropriate water, and the leaching thick solution of sodium aluminate of heating in the aluminum ash of basification above-mentioned；Extraction temperature is 65～100 DEG C, and extraction time is 1～2 hour；
E () refines: thick for the sodium aluminate of leaching solution is carried out filter pressing, and removes impurity with activated carbon adsorption, obtain refined sodium aluminate solution；
F saturated solution is stablized in () preparation: take the NaOH of 10% concentration to the Na regulating in sodium aluminate solution2O and Al2O3Molecular proportion (on-line instrument mensuration) so that it is reach 1.2～1.6；Obtain stable saturated solution of sodium aluminate；And adding stabilizer, its addition is the 3 ‰～8 ‰ of above-mentioned saturated sodium aluminate solution weight；
G () crystallize: above-mentioned saturated sodium aluminate solution is heated to 130～150 DEG C, sloughs moisture, obtains anhydrous sodium aluminate crystal, conversion rate of products is 75%～85%.
The chemical composition of the aluminium scrap ash used by the present invention is: (wt%)
Al2O360～67%
SiO210～14%
MgO 10～14%
Fe2O32～5%
CaO 2～4%
ZnO 0.3～0.4%
Cl 3～4%
N 0.5～1.0%
Feature and the advantage of the inventive method are as follows:
(1) present invention process is simple, and production cost is low；By the inventive method, trade waste aluminum ash can be turned waste into wealth, the industrial refuse polluting environment is become useful raw material, it is achieved that the innoxious and recycling treatment of aluminium scrap ash.
(2) sodium aluminate typically all uses aluminium hydroxide alkaline hydrolysis to prepare at present, and this method production cost is higher, therefore the inventive method also can prepare sodium aluminate as a kind of householder method.
(3), in the inventive method, by adding stabilizer triethanolamine, saturated and solution the long term storage performance of sodium aluminate is made to be greatly improved.
(4) sodium aluminate is as a kind of important inorganic chemical product, is widely used in water purification, glass and the neutralizing treatment solution retardant of pottery etching, paper industry and makees filler, steel surface treatment protective agent etc..
Detailed description of the invention
After now the specific embodiment of the present invention being described in.
Embodiment 1
The concrete technology step of the inventive method is as follows:
(1) except ammonia treatment: 30 grams of aluminum ashes are put in reactor, add the dilute hydrochloric acid 100ml that concentration is 0.01N, be heated to 80 DEG C, and keep seething with excitement 2 hours, make the nitride in aluminum ash be fully converted into ammonia and be removed, Ammonia recovery；
(2) processed: except the aluminum ash after ammonia carries out dehydration extremely aqueous ＜ 5%；
(3) basification: add 10 grams of NaOH in aluminum ash after dewatering, and be stirred；
(4) leach: above-mentioned in the aluminum ash of basification, add 100ml deionized water, and the leaching thick solution of sodium aluminate of heating；Extraction temperature is 80 DEG C, and extraction time is 2 hours；
(5) refined: thick for the sodium aluminate of leaching solution to be carried out filter pressing, and removes impurity with activated carbon adsorption, obtain refined sodium aluminate solution；
(6) saturated solution is stablized in preparation: take the NaOH of 10% concentration to the Na regulating in sodium aluminate solution2O and Al2O3Molecular proportion so that it is reach 1.5；Obtain stable saturated solution of sodium aluminate；And adding stabilizer triethanolamine, its addition is the 5 ‰ of above-mentioned saturated sodium aluminate solution weight
(7) crystallize: above-mentioned saturated sodium aluminate solution is heated to 130 DEG C, sloughs moisture, obtains anhydrous sodium aluminate crystal 24.5g.
The chemical composition of aluminium scrap ash used in the present embodiment is: (wt%)
Al2O361.8%
SiO210.5%
MgO 10.7%
Fe2O32.2%
CaO 2.4%
ZnO 0.38%
Cl 3.7%
N 0.6%
Calcination loss 7.72%
Through XRD analysis, after alkali processes, the remaining residue of institute is magnesium Si oxide and calcium and magnesium Si oxide, and the aluminium oxide that few part is not dissolved, and environment will not be caused any pollution by the residue of these compositions, and is used directly for the preparation of construction material.
Claims (10)
1. by a method for preparing sodium aluminate from waste aluminium ash, including preparing sodium aluminate fluid product and solid product, it is characterised in that have following technical process and a step: (a) physical treatment；B () leaches the thick solution of sodium aluminate；C () solution refines；D saturated solution is stablized in () preparation；E () prepares solid sodium aluminate product.
The method of a kind of preparing sodium aluminate from waste aluminium ash the most as claimed in claim 1, it is characterised in that described aluminium scrap ash
Chemical composition be: (wt%) Al2O360～67% SiO210～14% MgO 10～14% Fe2O32～5% CaO 2～4% ZnO 0.3～0.4% Cl 3～4% N 0.5～1.0%
。
The method of a kind of preparing sodium aluminate from waste aluminium ash the most as claimed in claim 1, physical treatment include aluminum ash screening,
Remove impurity, process except ammonia etc..
The method of a kind of preparing sodium aluminate from waste aluminium ash the most as claimed in claim 1, uses NaOH to the aluminum after processing
Ash carries out basification, and leaches the thick solution of sodium aluminate.
5. the method leaching the thick solution of sodium aluminate as claimed in claim 4, extraction temperature is 65～100 DEG C, and extraction time is 1～2 hour.
The method of a kind of preparing sodium aluminate from waste aluminium ash the most as claimed in claim 1, will carry out refinement treatment by solution thick to sodium aluminate.
7. the method for the refined thick solution of sodium aluminate as claimed in claim 6, the thick solution of sodium aluminate of leaching needs to press
Filter, remove impurity process, and it is to select the impurity having the material such as ceramic grain filter of absorbability, activated carbon, active phosphorus lime stone etc. to remove in solution that remove impurity processes.
The method of a kind of preparing sodium aluminate from waste aluminium ash the most as claimed in claim 1, by adjusting Na2O and Al2O3Molecular proportion and add stabilizer, prepare stable saturated sodium aluminate solution.
9. prepare the method stablizing saturated sodium aluminate solution as claimed in claim 8, use NaOH to regulate Na2O and Al2O3Molecular proportion (on-line instrument mensuration) in the range of 1.2～1.6.
10. prepare the method stablizing saturated sodium aluminate solution as claimed in claim 8, add stabilizer and make solution keep steady
Fixed, stabilizer can select triethanolamine, polyvinyl alcohol, Polyethylene Glycol etc., and addition is the 3 ‰～8 ‰ of above-mentioned saturated sodium aluminate solution weight.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110026413A (en) * | 2018-04-27 | 2019-07-19 | 南通大学 | The multiple stage circulation of aluminium lime-ash denitrogenates demineralizer and method |
| CN111348669A (en) * | 2020-03-16 | 2020-06-30 | 郑州轻工业大学 | Preparation method of sodium hexafluoroaluminate |
| CN112974476A (en) * | 2021-02-06 | 2021-06-18 | 达州励志环保科技有限公司 | Method for treating aluminum ash by using caustic soda |
| TWI760226B (en) * | 2021-05-19 | 2022-04-01 | 釔銪鑫應用材料有限公司 | Treatment method of metal oxide slag |
| CN115321568A (en) * | 2022-01-21 | 2022-11-11 | 重庆龙健金属制造有限公司 | Method for preparing sodium aluminate by resource utilization of aluminum ash |
-
2015
- 2015-06-24 CN CN201510351927.4A patent/CN106315634A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110026413A (en) * | 2018-04-27 | 2019-07-19 | 南通大学 | The multiple stage circulation of aluminium lime-ash denitrogenates demineralizer and method |
| CN111348669A (en) * | 2020-03-16 | 2020-06-30 | 郑州轻工业大学 | Preparation method of sodium hexafluoroaluminate |
| CN111348669B (en) * | 2020-03-16 | 2022-09-30 | 郑州轻大产业技术研究院有限公司 | Preparation method of sodium hexafluoroaluminate |
| CN112974476A (en) * | 2021-02-06 | 2021-06-18 | 达州励志环保科技有限公司 | Method for treating aluminum ash by using caustic soda |
| TWI760226B (en) * | 2021-05-19 | 2022-04-01 | 釔銪鑫應用材料有限公司 | Treatment method of metal oxide slag |
| CN115321568A (en) * | 2022-01-21 | 2022-11-11 | 重庆龙健金属制造有限公司 | Method for preparing sodium aluminate by resource utilization of aluminum ash |
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Application publication date: 20170111 |