CN105293586A - Method for preparing red iron oxide with sludge produced in neodymium-iron-boron waste recovery - Google Patents
Method for preparing red iron oxide with sludge produced in neodymium-iron-boron waste recovery Download PDFInfo
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- CN105293586A CN105293586A CN201410297162.6A CN201410297162A CN105293586A CN 105293586 A CN105293586 A CN 105293586A CN 201410297162 A CN201410297162 A CN 201410297162A CN 105293586 A CN105293586 A CN 105293586A
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Abstract
The invention discloses a method for preparing red iron oxide with sludge produced in neodymium-iron-boron waste recovery. According to the invention, a raw material which is a sludge waste produced during a neodymium-iron-boron waste recovery process is subjected to acid dissolution, oxidation, precipitation, filtration and firing, such that red iron oxide is obtained. According to the invention, the sludge is soaked for 1-4h with 10-35% hydrochloric acid under stirring and under a temperature of 40-80 DEG C, wherein a final pH value is controlled at 1-7; divalent iron is oxidized into trivalent iron with potassium chlorate, wherein a dose of potassium chlorate is 1-10% of the weight of dry sludge; the temperature is quickly increased to 50-100 DEG C by heating; ammonium bicarbonate is used for precipitation, wherein the addition amount of ammonium bicarbonate satisfies that the pH value of the solution reaches 7-14; and iron carbonate is fired in a firing kiln with a temperature of 200-800 DEG C. with the method provided by the invention, valuable elements can be completely recycled, mineral resources can be saved, ecological environment can be protected, and more importantly red iron oxide with extremely high purity can be recovered from waste sludge.
Description
Technical field
The present invention relates to a kind of trade waste recoverying and utilizing method, be specifically related to the method for the clay standby red iron oxide of slag produced during a kind of neodymium iron boron waste material reclaims.
Background technology
Domestic neodymium iron boron annual production has reached nearly 300,000 tons, be processed into the waste material of generation about 30% in various neodymium iron boron product process, and not only containing rare earth elements such as valuable high praseodymium, neodymium, terbium, dysprosium, gadoliniums in these waste materials, also contain the metallic iron of more than 70%, i.e. more than 70,000 ton of iron, and very high purity.Because the value of iron is compared with the value of rare earth, simply negligible, also this reason just, the slag mud of generation is often all thrown away by neodymium iron boron returned enterprise, not only cause environmental pollution, the more important thing is and wasted iron resources that is valuable, very high purity.
Summary of the invention
Technical problem to be solved by this invention is for the deficiencies in the prior art, provide a kind of can make full use of resource, organic efficiency high reclaim with neodymium iron boron waste material in the method for the clay standby red iron oxide of slag that produces.
Technical problem to be solved by this invention is realized by following technical scheme.The present invention is the method for the clay standby red iron oxide of the slag of generation during a kind of neodymium iron boron waste material reclaims, and being characterized in: the raw materials used slag mud waste material for producing in neodymium iron boron waste material removal process, forming through acid-soluble, oxidation, precipitation, filtration, calcination; Described acid-soluble be by the salt acid soak 1-4 hour of slag mud 10-35%, and constantly stir, temperature is 40 DEG C-80 DEG C, and controls final ph 1-7; Described oxidation is that Potcrate consumption is the 1-10% of dry slag mud weight, and is heated to 50-100 DEG C rapidly with Potcrate oxidation of ferrous iron to ferric iron, keeps 0.5-2 hour; Described precipitation precipitates with bicarbonate of ammonia, and bicarbonate of ammonia add-on reaches 7-14 to solution ph; Described calcination carries out calcination in calcination kiln iron carbonate being sent into 200-800 DEG C, and calcination time is 0.5-3 hour.
The method of the clay standby red iron oxide of the slag produced during a kind of neodymium iron boron waste material of the present invention reclaims, its most preferred technical scheme is: described acid-soluble be by slag mud with 20% salt acid soak 2 hours, and constantly stir, temperature is 60 DEG C, and controls final ph 3; Described oxidation is that Potcrate consumption is 5% of dry slag mud weight, and is heated to rapidly 70 DEG C, keeps 1 hour with Potcrate oxidation of ferrous iron to ferric iron; Described precipitation precipitates with bicarbonate of ammonia, and bicarbonate of ammonia add-on reaches 10 to solution ph; Described calcination carries out calcination in calcination kiln iron carbonate being sent into 500 DEG C, and calcination time is 2 hours.
Compared with prior art, the inventive method not only can realize whole recyclings of valuable element, saves Mineral resources, preserves the ecological environment, the more important thing is the red iron oxide that can be recovered to very high purity from castaway slag mud.
Embodiment
Embodiment 1, a kind of method of the clay standby red iron oxide of the slag of generation during neodymium iron boron waste material reclaims: the raw materials used slag mud waste material for producing in neodymium iron boron waste material removal process, forms through acid-soluble, oxidation, precipitation, filtration, calcination; Described acid-soluble be by the salt acid soak 1-4 hour of slag mud 10-35%, and constantly stir, temperature is 40 DEG C-80 DEG C, and controls final ph 1-7; Described oxidation is that Potcrate consumption is the 1-10% of dry slag mud weight, and is heated to 50-100 DEG C rapidly with Potcrate oxidation of ferrous iron to ferric iron, keeps 0.5-2 hour; Described precipitation precipitates with bicarbonate of ammonia, and bicarbonate of ammonia add-on reaches 7-14 to solution ph; Described calcination carries out calcination in calcination kiln iron carbonate being sent into 200-800 DEG C, and calcination time is 0.5-3 hour.
Embodiment 2, the method for the clay standby red iron oxide of the slag produced during a kind of neodymium iron boron waste material reclaims: described acid-soluble be that and constantly stir, temperature is 60 DEG C, and controls final ph 3 by the slag mud salt acid soak 2 hours of 20%; Described oxidation is that Potcrate consumption is 5% of dry slag mud weight, and is heated to rapidly 70 DEG C, keeps 1 hour with Potcrate oxidation of ferrous iron to ferric iron; Described precipitation precipitates with bicarbonate of ammonia, and bicarbonate of ammonia add-on reaches 10 to solution ph; Described calcination carries out calcination in calcination kiln iron carbonate being sent into 500 DEG C, and calcination time is 2 hours.
Claims (2)
1. in reclaiming with neodymium iron boron waste material, a method for the clay standby red iron oxide of the slag of generation, is characterized in that: the raw materials used slag mud waste material for producing in neodymium iron boron waste material removal process, forming through acid-soluble, oxidation, precipitation, filtration, calcination; Described acid-soluble be by the salt acid soak 1-4 hour of slag mud 10-35%, and constantly stir, temperature is 40 DEG C-80 DEG C, and controls final ph 1-7; Described oxidation is that Potcrate consumption is the 1-10% of dry slag mud weight, and is heated to 50-100 DEG C rapidly with Potcrate oxidation of ferrous iron to ferric iron, keeps 0.5-2 hour; Described precipitation precipitates with bicarbonate of ammonia, and bicarbonate of ammonia add-on reaches 7-14 to solution ph; Described calcination carries out calcination in calcination kiln iron carbonate being sent into 200-800 DEG C, and calcination time is 0.5-3 hour.
2. the method for the clay standby red iron oxide of slag produced in a kind of neodymium iron boron waste material recovery according to claim 1, it is characterized in that: described acid-soluble be by slag mud with 20% salt acid soak 2 hours, and constantly stir, temperature is 60 DEG C, and controls final ph 3; Described oxidation is that Potcrate consumption is 5% of dry slag mud weight, and is heated to rapidly 70 DEG C, keeps 1 hour with Potcrate oxidation of ferrous iron to ferric iron; Described precipitation precipitates with bicarbonate of ammonia, and bicarbonate of ammonia add-on reaches 10 to solution ph; Described calcination carries out calcination in calcination kiln iron carbonate being sent into 500 DEG C, and calcination time is 2 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410297162.6A CN105293586A (en) | 2014-06-28 | 2014-06-28 | Method for preparing red iron oxide with sludge produced in neodymium-iron-boron waste recovery |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410297162.6A CN105293586A (en) | 2014-06-28 | 2014-06-28 | Method for preparing red iron oxide with sludge produced in neodymium-iron-boron waste recovery |
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| CN105293586A true CN105293586A (en) | 2016-02-03 |
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| CN201410297162.6A Pending CN105293586A (en) | 2014-06-28 | 2014-06-28 | Method for preparing red iron oxide with sludge produced in neodymium-iron-boron waste recovery |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105734296A (en) * | 2016-04-20 | 2016-07-06 | 南阳东方应用化工研究所 | Comprehensive utilization method of neodymium iron boron waste acid leaching slag |
| CN108018430A (en) * | 2017-12-28 | 2018-05-11 | 长春工程学院 | A kind of device and method of neodymium iron boron powdered scrap room temperature wet oxidation iron removaling |
-
2014
- 2014-06-28 CN CN201410297162.6A patent/CN105293586A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105734296A (en) * | 2016-04-20 | 2016-07-06 | 南阳东方应用化工研究所 | Comprehensive utilization method of neodymium iron boron waste acid leaching slag |
| CN108018430A (en) * | 2017-12-28 | 2018-05-11 | 长春工程学院 | A kind of device and method of neodymium iron boron powdered scrap room temperature wet oxidation iron removaling |
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Application publication date: 20160203 |
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