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A method for recovering chromium from ferronickel smelting slag and preparing lightweight heat insulating material

A technology of ferronickel smelting slag and light heat insulation, which is applied in the field of metallurgy, can solve the problems of secondary pollution of chromium, low utilization efficiency, high roasting temperature, etc., and achieve the effects of high production efficiency, high added value of products and simple process

Active Publication Date: 2021-04-02
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a large amount of leaching slag is produced, and the potential secondary pollution problem is serious
[0005] In summary, the chromium content in ferronickel slag is an important factor affecting its application in the building materials industry. However, the recovery of chromium from ferronickel slag currently has problems such as high roasting temperature, low utilization efficiency, and secondary pollution of chromium. More efficient recycling processes need to be developed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The fine powder of ferronickel smelting slag is uniformly mixed with sodium nitrite and sodium peroxide to obtain a mixture, which is roasted in a muffle furnace, and the roasted sample is ground and soaked in water to obtain chromium-containing leachate and leach residue. After the leaching slag is evenly mixed with humic acid and water, it is pressed and dried, fired in a muffle furnace, and the heating and cooling rate is controlled to prepare a lightweight heat insulating material.

[0045] The mass ratio of nickel-iron smelting slag fine powder to sodium nitrite and sodium peroxide in the mixed material is 1:0.3:0.8.

[0046] The calcination temperature is 380°C.

[0047] The roasting time is 55min.

[0048] The leaching temperature is 60°C.

[0049] The leaching time is 60min.

[0050] The leaching liquid-solid ratio is 7mL / g.

[0051] The roasted sample is ground to an average particle size of 66 μm.

[0052] The amount of humic acid is 5wt.%, and the amount...

Embodiment 2

[0059] The fine powder of ferronickel smelting slag is uniformly mixed with sodium nitrite and sodium peroxide to obtain a mixture, which is roasted in a muffle furnace, and the roasted sample is ground and soaked in water to obtain chromium-containing leachate and leach residue. After the leaching slag is evenly mixed with humic acid and water, it is pressed and dried, fired in a muffle furnace, and the heating and cooling rate is controlled to prepare a lightweight heat insulating material.

[0060] The mass ratio of nickel-iron smelting slag fine powder to sodium nitrite and sodium peroxide in the mixed material is 1:0.3:0.8.

[0061] The calcination temperature is 360°C.

[0062] The roasting time is 55min.

[0063] The leaching temperature is 55°C.

[0064] The leaching time is 70min.

[0065] The leaching liquid-solid ratio is 6mL / g.

[0066] The roasted sample is ground to an average particle size of 66 μm.

[0067] The amount of humic acid is 3wt.%, and the amount...

Embodiment 3

[0074] The fine powder of ferronickel smelting slag is uniformly mixed with sodium nitrite and sodium peroxide to obtain a mixture, which is roasted in a muffle furnace, and the roasted sample is ground and soaked in water to obtain chromium-containing leachate and leach residue. After the leaching slag is evenly mixed with humic acid and water, it is pressed and dried, fired in a muffle furnace, and the heating and cooling rate is controlled to prepare a lightweight heat insulating material.

[0075] The mass ratio of nickel-iron smelting slag fine powder to sodium nitrite and sodium peroxide in the mixed material is 1:0.2:1.0.

[0076] The calcination temperature is 400°C.

[0077] The roasting time is 50min.

[0078] The leaching temperature is 75°C.

[0079] The leaching time is 80min.

[0080] The leaching liquid-solid ratio is 7mL / g.

[0081] The roasted sample is ground to an average particle size of 66 μm.

[0082] The amount of humic acid is 10wt.%, and the amoun...

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Abstract

The invention discloses a method for recovering chromium from ferronickel smelting slags and preparing a light-weight thermal insulating material. The method comprises two processes of selectively recovering chromium from the ferronickel smelting slags and preparing a light-weight thermal insulating material by using leaching residues after chromium extraction. The ferronickel smelting slag fine powder is used as a raw material, sodium nitrite and sodium peroxide are used as additives, the mass ratio of the ferronickel smelting slags to the sodium nitrite to the sodium peroxide is controlled to be 1 to (0.2-0.4) to (0.3-1.0), the ferronickel smelting slag fine powder is mixed with the sodium nitrite and the sodium peroxide uniformly, and then is roasted, the roasted materials are leached through water, and chromium-containing lixivium and leaching residues are obtained. The leaching residues are uniformly mixed with humic acid and water to obtain a mixture, and then the mixture is pressed, formed, dried and roasted, so that the light-weight thermal insulating material is obtained. According to the method for recovering chromium from the ferronickel smelting slags and preparing thelight-weight thermal insulating material, the selective recovery of chromium in the ferronickel smelting slags and the efficient value-added utilization of leaching residues can be realized; and the method has the advantages of being high in production efficiency, green and environment-friendly, high in product additional value and the like, and provides a new direction for the resource utilization of the ferronickel smelting slags and the chromium-containing waste residues.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for recovering chromium from ferronickel smelting slag and preparing a lightweight heat insulating material. Background technique [0002] my country is the world's largest consumer of chromium resources, and its chromium consumption exceeds one-third of the world's chromite ore output, but my country's annual chromite ore output is less than 1% of the world's annual output. The huge demand makes chromium become a One of the metals with the highest dependence on foreign countries in my country, the contradiction between supply and demand is very prominent. [0003] On the other hand, with the rapid development of laterite nickel ore smelting ferronickel technology, the discharge of ferronickel smelting slag has increased sharply. According to incomplete statistics, the annual production of ferronickel smelting slag in my country has exceeded 30 million tons...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/04C22B1/02C22B34/32C04B33/138C04B38/02C04B33/13
CPCC04B33/1305C04B33/138C04B35/634C04B38/02C04B2235/77C04B2235/96C04B2235/9607C22B1/02C22B7/006C22B7/04C22B34/32C04B38/0067C04B38/0074Y02P10/20Y02P40/60
Inventor 彭志伟张元波李光辉古佛全姜涛饶明军苏子键杨磊范晓慧郭宇峰杨永斌李骞徐斌杨凌志易凌云唐慧敏王连成
Owner CENT SOUTH UNIV
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