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Method for recovering chromium from nickel-iron smelting slag and preparing geopolymer

A technology for smelting slag and geopolymer of ferronickel, applied in the field of metallurgy, can solve the problems of low recovery efficiency, secondary pollution of chromium, and high roasting temperature, and achieve the effects of high production efficiency, high chromium recovery rate, and efficient excitation

Active Publication Date: 2019-07-05
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] To sum up, 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 recovery 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

[0041]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. Grind the leaching slag to -37 μm in a planetary ball mill, control the ratio of water to leaching slag abrasive, pour into a shape, cure at room temperature after demoulding, and then cure in a curing box to prepare the geopolymer.

[0042] The mass ratio of nickel-iron smelting slag fine powder to sodium nitrite and sodium peroxide in the mixed material is 1:0.5:1.2.

[0043] The calcination temperature is 400°C.

[0044] The roasting time is 60min.

[0045] The leaching temperature is 70°C.

[0046] The leaching time is 40min.

[0047] The leaching liquid-solid ratio is 8mL / g.

[0048] The roasted sample is ground to an average particle size of 68 μm.

[0049] The water to leaching slag abrasiv...

Embodiment 2

[0055] 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. Grind the leaching slag to -37 μm in a planetary ball mill, control the ratio of water to leaching slag abrasive, pour into a shape, cure at room temperature after demoulding, and then cure in a curing box to prepare the geopolymer.

[0056] The mass ratio of nickel-iron smelting slag fine powder to sodium nitrite and sodium peroxide in the mixed material is 1:0.5:0.5.

[0057] The calcination temperature is 300°C.

[0058] The roasting time is 80min.

[0059] The leaching temperature is 25°C.

[0060] The leaching time is 40min.

[0061] The leaching liquid-solid ratio is 8mL / g.

[0062] The roasted sample is ground to an average particle size of 60 μm.

[0063] The water to leaching slag abrasi...

Embodiment 3

[0069] After uniformly mixing fine powder of ferronickel smelting slag with sodium nitrite and sodium peroxide to obtain a mixture, roasting in a muffle furnace, grinding the roasted sample, and immersing in water to obtain chromium-containing leachate and leaching slag. Grind the leaching slag to -37 μm in a planetary ball mill, control the ratio of water to leaching slag abrasive, pour into a shape, cure at room temperature after demoulding, and then cure in a curing box to prepare the geopolymer.

[0070] The mass ratio of nickel-iron smelting slag fine powder to sodium nitrite and sodium peroxide in the mixed material is 1:0.1:1.8.

[0071] The calcination temperature is 450°C.

[0072] The roasting time is 20min.

[0073] The leaching temperature is 25°C.

[0074] The leaching time is 20min.

[0075] The leaching liquid-solid ratio is 5mL / g.

[0076] The roasted sample is ground to an average particle size of 68 μm.

[0077] The water to leaching slag abrasive ratio ...

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Abstract

The invention discloses a method for recovering chromium from nickel-iron smelting slag and preparing a geopolymer. The method comprises the two processes of selectively recovering the chromium from the nickel-iron smelting slag and utilizing leaching residue after chromium extraction to prepare the geopolymer. Nickel-iron smelting slag fine powder is evenly mixed with sodium nitrite and sodium peroxide to obtain an evenly-mixed material, the evenly-mixed material is roasted and subjected to water leaching to obtain chromium-containing lixivium and the leaching residue, water is added into theleaching residue, pouring forming and curing are conducted, and thus the geopolymer is obtained. According to the method, the chromium recovering rate is high, full quantification utilizing of the nickel-iron smelting slag can be achieved, the strength of the obtained geopolymer is greatly improved compared with the strength of a geopolymer obtained through the nickel-iron smelting slag in the prior art, and the important environmental and economic benefits are achieved.

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 geopolymer. 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, and its utilization rate i...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B1/02C22B34/32C04B7/153
CPCC04B7/1535C04B12/005C22B1/02C22B7/001C22B7/006C22B7/04C22B34/32Y02P10/20Y02P40/10
Inventor 彭志伟张元波古佛全李光辉姜涛饶明军苏子键范晓慧郭宇峰杨永斌李骞徐斌杨凌志易凌云唐慧敏杨磊王连成
Owner CENT SOUTH UNIV
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