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Microwave strengthening method for recovering chromium from ferronickel smelting slag and preparing light heat insulation material

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

Active Publication Date: 2019-07-02
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

[0045] Mix the fine powder of nickel-iron smelting slag with sodium nitrite and sodium peroxide evenly to obtain the mixture, roast it in a microwave oven, grind the roasted sample finely, immerse it in microwave reactor and filter to obtain chromium-containing leaching solution leaching slag . After the leaching residue is evenly mixed with humic acid and water, it is pressed and dried, fired in a microwave oven, and the heating and cooling rate is controlled to prepare a lightweight heat insulating material.

[0046] The mass ratio of nickel-iron smelting slag fine powder to sodium nitrite and sodium peroxide in the mixed material is 1:0.2:0.6.

[0047] The calcination temperature is 350°C.

[0048] The roasting time is 15min.

[0049] The leaching temperature is 50°C.

[0050] The leaching time is 15min.

[0051] The leaching liquid-solid ratio is 8mL / g.

[0052] The roasted sample is ground to an average particle size of 66 μm.

[0053] The amount of humic acid is 5w...

Embodiment 2

[0060] Mix the fine powder of nickel-iron smelting slag with sodium nitrite and sodium peroxide evenly to obtain the mixture, roast it in a microwave oven, grind the roasted sample finely, immerse it in microwave reactor and filter to obtain chromium-containing leaching solution leaching slag . After the leaching residue is evenly mixed with humic acid and water, it is pressed and dried, fired in a microwave oven, and the heating and cooling rate is controlled to prepare a lightweight heat insulating material.

[0061] The mass ratio of nickel-iron smelting slag fine powder to sodium nitrite and sodium peroxide in the mixed material is 1:0.2:0.3.

[0062] The calcination temperature is 450°C.

[0063] The roasting time is 20min.

[0064] The leaching temperature is 80°C.

[0065] The leaching time is 30min.

[0066] The leaching liquid-solid ratio is 8mL / g.

[0067] The roasted sample is ground to an average particle size of 66 μm.

[0068] The amount of humic acid is 3w...

Embodiment 3

[0075] Mix the fine powder of nickel-iron smelting slag with sodium nitrite and sodium peroxide evenly to obtain the mixture, roast it in a microwave oven, grind the roasted sample finely, immerse it in microwave reactor and filter to obtain chromium-containing leaching solution leaching slag . After the leaching residue is evenly mixed with humic acid and water, it is pressed and dried, fired in a microwave oven, and the heating and cooling rate is controlled to prepare a lightweight heat insulating material.

[0076] The mass ratio of nickel-iron smelting slag fine powder to sodium nitrite and sodium peroxide in the mixed material is 1:0.4:1.0.

[0077] The calcination temperature is 300°C.

[0078] The roasting time is 5min.

[0079] The leaching temperature is 25°C.

[0080] The leaching time is 5min.

[0081] The leaching liquid-solid ratio is 2mL / g.

[0082] The roasted sample is ground to an average particle size of 58 μm.

[0083] The amount of humic acid is 2wt....

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Abstract

The invention discloses a microwave strengthening method for recovering chromium from ferronickel smelting slag and preparing a light heat insulation material. The microwave strengthening method includes the two processes of selective recovery of the chromium from the ferronickel smelting slag through microwave strengthening and preparation of the light heat insulation material through leaching slag after chromium extraction. Ferronickel smelting slag powder is used as a raw material, sodium nitrite and sodium peroxide are used as additives, the mass ratio of the ferronickel smelting slag powder to the sodium nitrite to the sodium peroxide is controlled to be 1:(0.2 to 0.4):(0.3 to 1.2), after the ferronickel smelting slag powder, the sodium nitrite and the sodium peroxide are mixed well,microwave roasting is conducted, roasting materials are immersed in water assisted by microwaves, and leaching liquid and leaching slag containing the chromium are obtained after filtration; and afterthe leaching slag is evenly mixed with humic acid and water, compression moulding and drying are conducted, and the light heat insulation material can be obtained after microwave roasting. The methodcan achieve selective recovery of the chromium from the ferronickel smelting slag and efficient value-added utilization of the leaching slag, and the multiple advantages of high production efficiency, environmental protection, high added value of products and the like are achieved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a microwave-intensified method for recovering chromium from ferronickel smelting slag and preparing a light 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...

Claims

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Application Information

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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 彭志伟李光辉张元波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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