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Recycling method of iron-making and steel-making manganese slag

A technology of resource utilization and manganese slag, applied in the fields of environmental protection and energy saving, can solve the problems of lack of further research, high added value of transformed products, and increased difficulty for enterprises to survive.

Pending Publication Date: 2021-05-07
CHENGDU UNIV OF INFORMATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] It can be seen from the announcement documents that the goal of the industry is to recover elements and use waste residue as raw materials to produce products, but there is no further research on the large-volume recycling of waste residue and the transformation into products with high added value.
[0007] Silicon dioxide is made into silica gel or micropowder needs to go through the process of sodium silicate manufacturing, acidizing, aging, washing, etc., which consumes a lot of energy, and by-product sodium sulfate solution causes water salinization
[0008] In order to reduce the pollution of sodium sulfate, a large amount of heat energy must be consumed to recover sodium sulfate by evaporating and crystallizing, but the value of sodium sulfate itself is not high, which leads to high production costs and makes it more difficult for enterprises to survive

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1: Manganese slag from ironmaking and steelmaking in a factory contains 50% silicon dioxide, 20% aluminum oxide, 0.5% iron oxide, 20% calcium oxide, 3% magnesium oxide, and 6.5% manganese oxide. Add soft water with a weight ratio of 2 times and salt extraction raffinate and stir to form a slag-water mixture, slowly add concentrated sulfuric acid solution with a weight ratio of 0.2, or 10% dilute sulfuric acid with a weight ratio of 2 times, and continue stirring after all the sulfuric acid is added 0.2 hours, when the reaction is completed, ensure that the silicic acid does not form a colloid; send the reaction mixture into a centrifugal separation device, separate the centrifuged insoluble matter and calcium sulfate precipitate, and take out the supernatant 1, the mixed precipitate of insoluble matter and calcium sulfate respectively Add excess sulfuric acid aqueous solution to the mixed sediment, send it to the centrifugal separation device after the reaction i...

Embodiment 2

[0015] Example 2: Manganese slag from ironmaking and steelmaking in a factory contains 45% silicon dioxide, 25% aluminum oxide, 0.5% iron oxide, 20% calcium oxide, 3% magnesium oxide, and 6.5% manganese oxide. Add soft water with a weight ratio of 2 times and salt extraction raffinate and stir to form a slag-water mixture, slowly add concentrated sulfuric acid solution with a weight ratio of 0.24, or 10% dilute sulfuric acid with a weight ratio of 2.4 times, and continue stirring after all the sulfuric acid is added 0.25 hours, when the reaction is completed, ensure that the silicic acid does not form a colloid; send the reacted mixture into a centrifugal separation device, separate the centrifuged insoluble matter and calcium sulfate precipitate, and take out the supernatant 1, the mixed precipitate of insoluble matter and calcium sulfate respectively Add excess sulfuric acid aqueous solution to the mixed sediment, send it to the centrifugal separation device after the reactio...

Embodiment 3

[0016] Example 3: Manganese slag from ironmaking and steelmaking in a factory contains 50% silicon dioxide, 15% aluminum oxide, 0.5% iron oxide, 25% calcium oxide, 3% magnesium oxide, and 6.5% manganese oxide. Add soft water with a weight ratio of 2 times and salt extraction raffinate and stir to form a slag-water mixture, slowly add concentrated sulfuric acid solution with a weight ratio of 0.2, or 10% dilute sulfuric acid with a weight ratio of 2 times, and continue stirring after all the sulfuric acid is added 0.2 hours, when the reaction is completed, ensure that the silicic acid does not form a colloid; send the reaction mixture into a centrifugal separation device, separate the centrifuged insoluble matter and calcium sulfate precipitate, and take out the supernatant 1, the mixed precipitate of insoluble matter and calcium sulfate respectively Add excess sulfuric acid aqueous solution to the mixed sediment, send it to the centrifugal separation device after the reaction i...

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PUM

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Abstract

The invention relates to a recycling method of iron-making and steel-making manganese slag, and belongs to the field of energy conservation and environmental protection. The method comprises the following steps: firstly, adding 1-10 parts by weight of soft water into manganese slag, stirring to form a slag-water mixture, slowly adding a certain weight ratio of concentrated sulfuric acid solution, continuously stirring for a certain time after sulfuric acid is completely added, feeding the reacted mixture into a centrifugal separation device, separating, respectively taking out supernatant liquid 1 and a mixed precipitate of insoluble substances and calcium sulfate, and drying to obtain the manganese slag; adding an excessive sulfuric acid aqueous solution into the mixed precipitate, after the reaction is completed, feeding the mixed precipitate into a centrifugal separation device for separation, respectively taking out supernatant 2, colloid and calcium sulfate, refining and purifying the product calcium sulfate, using a part of separated supernatant 2 for dissolving soluble salt in fresh manganese slag, adding a part of separated supernatant 2 and colloid into the supernatant 1, adjusting the pH value to 4-6, standing for 0.2-48 hours, condensing he clear liquid into gel, cutting the gel into gel blocks not larger than 5 cm, washing the gel blocks with water until the pH is 6-7, and then using the gel blocks for manufacturing silica gel.

Description

technical field [0001] The invention relates to the fields of energy saving and environmental protection, and is a method for effectively reducing the stacking of manganese slag waste from ironmaking, steelmaking, and resource recycling. Background technique [0002] The waste slag produced during the refining process of ferromanganese alloy is called manganese slag, which contains silicon dioxide, aluminum oxide, iron oxide, calcium oxide, magnesium oxide, manganese oxide, etc. Because manganese slag is difficult to apply to other industries as raw materials, it can only be stacked in the open air. Unreasonable stacking methods have caused serious pollution to surrounding surface water, groundwater, river sediment, and soil. A large amount of manganese slag is deposited in rivers and reservoirs, which affects the ecological environment of the river basin and the safety of drinking water sources. With the passage of time, the content of toxic substances in the sediment wil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/46C01B33/152C01G45/10C01F5/40C01G49/14C01F7/74
CPCC01F11/46C01B33/152C01G45/10C01F5/40C01G49/14C01F7/743C01P2004/60
Inventor 田黎霞徐成华刘建英杨鹏何俊良杨皓
Owner CHENGDU UNIV OF INFORMATION TECH