Method for recovering magnesium from ferronickel slag

A technology of ferronickel slag and seed crystals, which is applied in the field of magnesium recovery, can solve the problems of high equipment, reduction conditions and safety requirements, and the inability to carry out industrial application, so as to improve comprehensive utilization rate, high added value of products, and avoid dissolution loss Effect

Active Publication Date: 2020-11-13
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

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  • Method for recovering magnesium from ferronickel slag
  • Method for recovering magnesium from ferronickel slag
  • Method for recovering magnesium from ferronickel slag

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Embodiment 1

[0050] Such as figure 1 Shown, present embodiment relates to a kind of method that reclaims magnesium from ferronickel slag, comprises the following steps:

[0051] S1. Pretreatment: Dry the ferronickel slag at 105°C for 12 hours, set the rotation speed on the planetary ball mill to 300r / min, the revolution speed to 600r / min, and the grinding time for 3 hours. After ball milling, pass through a 300-mesh sieve to obtain the particle size The ferronickel slag powder smaller than 38μm, 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 milling, and so on, and finally all the batches of sieved materials are mixed evenly, and the obtained Ferronickel slag fine powder as solute.

[0052] S2, leaching: take by weighing 20g ferronickel slag fine powder and place in the there-necked flask, under the condition that the liquid-solid ratio is 20:1 (ml / g), add the sulfuric acid...

Embodiment 2

[0058] Present embodiment relates to a kind of method that reclaims magnesium from ferronickel slag, comprises the following steps:

[0059] S1. Pretreatment: Dry the ferronickel slag at 105°C for 8 hours, set the rotation speed on the planetary ball mill to 250r / min, the revolution speed to 500r / min, and the grinding time for 6 hours. After ball milling, pass through a 300-mesh sieve to obtain the particle size The ferronickel slag powder smaller than 38μm, 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 milling, and so on, and finally all the batches of sieved materials are mixed evenly, and the obtained Ferronickel slag fine powder as solute.

[0060] S2, leaching: Weigh 20g of ferronickel 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 1...

Embodiment 3

[0064] Present embodiment relates to a kind of method that reclaims magnesium from ferronickel slag, comprises the following steps:

[0065] S1. Pretreatment: Dry the ferronickel slag at 130°C for 6 hours, set the rotation speed on the planetary ball mill to 200r / min, the revolution speed to 400r / min, and the grinding time for 5 hours. After ball milling, pass through a 300-mesh sieve to obtain a particle size 38μm ferronickel 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 milling, and so on. Iron slag fine powder is used as solute.

[0066] S2. Leaching: Weigh 20g of ferronickel 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 without adding a cosolvent, and then put the flask Move it into a constant temperature heating ma...

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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. The method comprises the following steps of impregnating the ferronickel slag in concentrated sulfuric acid at normal pressure, adding a seed crystal, and crystallizing to precipitate magnesium sulfate. The magnesium in the ferronickel slag is converted into magnesiumsulfate for magnesium recovery through a full-wet process, the process is simple, operation is easy, the requirement for equipment is low, the magnesium recovery rate is high, the application range ofmagnesium sulfate is wide, the added value of products is high, and the comprehensive utilization rate of the ferronickel slag can be increased.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a method for recovering magnesium from ferronickel slag. Background technique [0002] Ferronickel slag is an industrial waste slag produced during the production of ferronickel, and it is the fourth largest metallurgical waste 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 for 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 poses severe challenges to the sustainable development of ferronickel smelting. Therefore, it is necessary to vigorously carry out scientific r...

Claims

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Application Information

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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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