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Comprehensive utilization method of NdFeB production wastewater

A technology for the production of waste water and products, applied in chemical instruments and methods, heating water/sewage treatment, flocculation/sedimentation water/sewage treatment, etc., can solve the problems of wasting hydrochloric acid and iron salt resources, polluting the environment, etc., and achieve the goal of improving resources Utilization rate, high economic benefits, effect of reducing environmental pollution problems

Inactive Publication Date: 2015-03-11
XIAN HUALU ENVIRONMENTAL PROTECTION EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large amount of acid-containing and iron-containing waste liquid is produced during production, which is discharged without treatment or simply neutralized with quicklime, which not only seriously pollutes the environment, but also wastes valuable hydrochloric acid and iron salt resources

Method used

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  • Comprehensive utilization method of NdFeB production wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Collect the acid-containing and iron-containing waste liquid after oxalic acid precipitation, distill the waste liquid at 100°C, condense and collect the distillate, and when 83% of the water is evaporated, cool and crystallize the evaporated mother liquid to form the first distillation crystallization The product, the crystallized mother liquor is evaporated and concentrated to 50% of the original volume, and then recrystallized to generate a re-distilled crystallized product, and the mixed condensed distillate is collected. The primary distillation and crystallization product is ferrous chloride with a content higher than 50% and neodymium oxalate containing about 1%, which can be sold as an industrial grade ferrous chloride product and used as a flocculant for wastewater treatment; the secondary distillation crystallization product is a content higher than 53 % ferrous chloride, which meets the specifications of reagent grade ferrous chloride, can be used as a chemica...

Embodiment 2

[0014] Embodiment two: processing effect

[0015] In a 1000mL three-neck flask, add 600mL of grass sediment filtrate (containing 0.5mol / L hydrochloric acid and 120g / L iron (calculated as ferrous chloride)) of a certain NdFeB production wastewater, connect a 30cm long snake-shaped condenser externally, and heat the mantle power It is 1000w. Use multiple 50mL volumetric flasks to collect the condensate, and each 50mL is a sample, which is used to analyze the change of the concentration of hydrochloric acid in the condensate with the amount of distillate. After 83% of the water is evaporated from the grass filtrate (the specific gravity of the mother liquor is 1.42), the evaporated mother liquor is cooled and crystallized, and the crystallization product is distilled for the first time. After the crystallized mother liquor is evaporated and concentrated to 50% of the original volume, the recrystallized product is re-distilled and crystallized. The composition of the crystalline...

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Abstract

The comprehensive utilization of the invention relates to a comprehensive utilization method of NdFeB production wastewater, and belongs to the fields of waste water treatment method and waste comprehensive utilization method. The comprehensive utilization method of the NdFeB production wastewater comprises the following steps: collecting waste liquid containing acid and iron after oxalate precipitation, distilling the waste liquid at 100 DEG C, condensing and collecting distilled liquid; when 83% of the water is evaporated, conducting cooling crystallization on the mother liquid after evaporation to generate a primary distillation crystallization product; re-evaporating the mother liquor after crystallization to concentrate to 50% of the original volume; recrystallizing to generate recrystallization distillation products; and collecting and mixing the condensation distilled liquid. The comprehensive utilization method of wastewater provided by the invention solves the problems of environmental pollution and resource waste caused by the traditional lime neutralization method; the by-product ferrous chloride can obtain high economic benefit, and recovered dilute hydrochloric acid can be used for rare earth extraction, thus greatly improving the utilization rate of resources and reducing environmental pollution. Therefore, the method can widely used in treatment and comprehensive utilization of similar acidic high-iron wastewater.

Description

technical field [0001] The invention relates to a comprehensive utilization method of NdFeB production wastewater, which belongs to the field of wastewater treatment methods and waste comprehensive utilization methods. Background technique [0002] Nd (25% to 30%) Fe (65% to 70%) B (1% to 1.5%) permanent magnet white has led to great changes in the permanent magnet material market in the world since it came out in 1985. There are more than 100 domestic enterprises producing and processing NdFeB magnets, with an annual production capacity of more than 4000t, ranking first in the world. During the production process of NdFeB magnets, the magnets need to be mechanically processed (such as cutting, polishing and drilling) to prepare magnetic products of different shapes. Waste materials account for more than 30% of the feed. At present, domestic small and medium-sized manufacturers use hydrochloric acid to dissolve NdFeB waste and oxalic acid to precipitate NdO to recover rare...

Claims

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Application Information

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IPC IPC(8): C02F1/04C01G49/10C01B7/07
CPCC02F1/04C01B7/0712C01G49/10C02F1/52C02F2001/5218
Inventor 陆强
Owner XIAN HUALU ENVIRONMENTAL PROTECTION EQUIP
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