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A kind of method of recovering magnesium from nickel iron slag

A technology of ferronickel slag and seed crystals, which is applied in the field of magnesium recovery, can solve the problems of high requirements for equipment, reduction conditions and safety, and the impossibility of industrial application, so as to achieve improved comprehensive utilization rate, high added value of products, and wide application range Effect

Active Publication Date: 2022-07-05
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defects in the prior art that the process of preparing magnesium metal by vacuum reduction of ferronickel slag to recover magnesium has high requirements for equipment, reduction conditions and safety, and cannot be applied industrially, thereby providing A kind of method that recovers magnesium from ferronickel slag

Method used

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  • A kind of method of recovering magnesium from nickel iron slag
  • A kind of method of recovering magnesium from nickel iron slag
  • A kind of method of recovering magnesium from nickel iron slag

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Embodiment 1

[0050] like figure 1 As shown, the present embodiment relates to a method for recovering magnesium from ferronickel slag, comprising the following steps:

[0051] S1. Pretreatment: Dry the nickel-iron slag at 105°C for 12h, set the rotation speed on the planetary ball mill to 300r / min, the revolution speed to 600r / min, the grinding time is 3h, pass through a 300-mesh sieve after ball milling, and obtain the particle size For the nickel-iron slag powder smaller than 38 μm, in order to ensure that the nickel slag used in each group of tests has the same composition, the particles larger than 38 μm are returned to the next batch of ball mills, and the process is repeated. The fine powder of nickel iron slag is used as the solute.

[0052] S2, leaching: Weigh 20g of nickel-iron slag fine powder and place it in a three-necked flask, under the condition that the liquid-solid ratio is 20:1 (ml / g), add a sulfuric acid solution with a concentration of 15N (N represents the equivalent ...

Embodiment 2

[0058] The present embodiment relates to a method for recovering magnesium from ferronickel slag, comprising the following steps:

[0059] S1. Pretreatment: Dry the nickel-iron slag at 105°C for 8h, set the rotation speed on the planetary ball mill to 250r / min, the revolution speed to 500r / min, the grinding time is 6h, pass through a 300-mesh sieve after ball milling, and obtain the particle size For the nickel-iron slag powder smaller than 38 μm, in order to ensure that the nickel slag used in each group of tests has the same composition, the particles larger than 38 μm are returned to the next batch of ball mills, and the process is repeated. The fine powder of nickel iron slag is used as the solute.

[0060] S2, leaching: Weigh 20g of nickel-iron slag fine powder and place it in a three-necked flask. Under the condition that the liquid-solid ratio is 10:1 (ml / g), add a sulfuric acid solution with a concentration of 11N, without adding a cosolvent, and then add The flask wa...

Embodiment 3

[0064] The present embodiment relates to a method for recovering magnesium from ferronickel slag, comprising the following steps:

[0065] S1. Pretreatment: Dry the nickel-iron slag at 130°C for 6h, set the rotation speed on the planetary ball mill to 200r / min, the revolution speed to 400r / min, the grinding time is 5h, pass through a 300-mesh sieve after ball milling, and obtain a particle size smaller than 38μm nickel-iron slag powder, in order to ensure that the nickel slag used in each group of tests has the same composition, the particles larger than 38μm are returned to the next batch of ball mills, and the process is repeated. Finally, all batches of sieved materials are mixed uniformly. Iron slag fines are used as the solute.

[0066] S2, leaching: Weigh 20g of nickel-iron slag fine powder and place it in a three-necked flask, under the condition that the liquid-solid ratio is 20:1 (ml / g), add a 15N sulfuric acid solution with a concentration of 15N, without adding a co...

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Abstract

The invention relates to the field of chemical industry, in particular to a method for recovering magnesium from ferronickel slag, which comprises the steps of immersing the ferronickel slag in concentrated sulfuric acid at atmospheric pressure, adding crystal seeds, and crystallizing out magnesium sulfate. The magnesium in the ferronickel slag is converted into magnesium sulfate for recovery of magnesium by adopting the all-wet process. The process is simple, easy to operate, requires low equipment, and has a high recovery rate of magnesium. Magnesium sulfate has a wide range of applications and high added value. It can improve the comprehensive utilization rate of nickel-iron slag.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a method for recovering magnesium from nickel-iron slag. Background technique [0002] Ferronickel slag is an industrial waste slag produced during the production of ferronickel, and is the fourth largest metallurgical waste slag after iron slag, steel slag and red mud. Compared with other metallurgical slags, ferronickel slag has a low recovery value of valuable metals and a large amount of slag discharge, which has gradually become a major problem in the treatment of metallurgical waste slag. The common treatment methods of ferronickel slag are mainly storage and landfill. However, these two treatment methods will cause a large amount of accumulation of ferronickel slag, which not only occupies land and pollutes the environment, but also brings serious challenges to the sustainable development of ferronickel smelting. Promoting the value-added utilization of ferronickel slag i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/04C22B1/00C22B26/22C30B29/22C30B28/04C30B7/00
CPCC22B7/04C22B7/007C22B1/005C22B26/22C30B29/22C30B28/04C30B7/00Y02P10/20
Inventor 高锋韦悦周黄治成
Owner GUANGXI UNIV
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