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Method for preparing red iron oxide with sludge produced in neodymium-iron-boron waste recovery

A technology of waste recycling and iron oxide red, which is applied in the direction of iron oxide, iron oxide/iron hydroxide, solid waste removal, etc., can solve the problems of wasting iron resources, environmental pollution, etc., and achieve the goal of protecting the ecological environment and saving mineral resources Effect

Inactive Publication Date: 2016-02-03
郭耀
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the value of iron is negligible compared with the value of rare earth, it is for this reason that NdFeB recycling companies often throw away the generated sludge, which not only causes environmental pollution, but more importantly, wastes it in vain. Valuable and extremely high-purity iron resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0007] Embodiment 1, a method for preparing red iron oxide from slag produced in the recovery of NdFeB waste: the raw material used is the slag waste produced in the recovery process of NdFeB waste, which is acid-dissolved, oxidized, precipitated, filtered, It is formed by burning; the acid dissolution is to soak the sludge with 10-35% hydrochloric acid for 1-4 hours, and keep stirring, the temperature is 40°C-80°C, and the final pH value is controlled to 1-7; the oxidation The divalent iron is oxidized to ferric iron with potassium chlorate, the amount of potassium chlorate is 1-10% of the weight of the dry sludge, and the temperature is rapidly raised to 50-100°C and kept for 0.5-2 hours; the precipitation is carried out with ammonium bicarbonate For precipitation, add ammonium bicarbonate until the pH value of the solution reaches 7-14; the burning is to send the iron carbonate into a burning kiln at 200-800°C for burning, and the burning time is 0.5-3 hours.

Embodiment 2

[0008] Example 2, a method for preparing iron oxide red from slag produced in the recovery of NdFeB waste: the acid dissolution is to soak the slag with 20% hydrochloric acid for 2 hours and keep stirring at a temperature of 60°C. And control the final pH value of 3; the oxidation is to use potassium chlorate to oxidize ferrous iron to ferric iron, and the amount of potassium chlorate is 5% of the dry sludge weight, and it is heated rapidly to 70 ° C and kept for 1 hour; the precipitation is Ammonium bicarbonate is used for precipitation, and the amount of ammonium bicarbonate is added until the pH value of the solution reaches 10; the burning is to send iron carbonate into a burning kiln at 500°C for burning, and the burning time is 2 hours.

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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 [0001] The invention relates to a method for recycling industrial waste, in particular to a method for preparing red iron oxide from slag generated in recycling NdFeB waste. Background technique [0002] The domestic annual output of NdFeB has reached nearly 300,000 tons, and about 30% of the waste will be generated in the process of being processed into various NdFeB products, and these wastes not only contain extremely valuable praseodymium, neodymium, terbium, dysprosium, Rare earth elements such as gadolinium also contain more than 70% metallic iron, that is, more than 70,000 tons of iron, and the purity is extremely high. Because the value of iron is negligible compared with the value of rare earth, it is for this reason that NdFeB recycling companies often throw away the generated sludge, which not only causes environmental pollution, but more importantly, wastes it in vain. The precious and extremely high-purity iron resources have been obtained. Co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/06B09B3/00
Inventor 郭耀
Owner 郭耀
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