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A method of mineralizing co with ironmaking blast furnace slag 2 Co-production method of alumina

A technology of blast furnace slag and alumina, which is applied in chemical instruments and methods, inorganic chemistry, cement production, etc. It can solve the problems of difficult use of water leaching slag, storage and transportation, etc., and achieve the effect of low cost and simple process

Inactive Publication Date: 2018-01-26
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problems of this method are: ① The main components of the water leaching residue are calcium sulfate and silica, and cement products have strict restrictions on the sulfur content, so the water leaching residue is difficult to use; ② Because the water leaching residue contains a large amount of Sulfate means that the amount of ammonia produced during the roasting process is much greater than that required for the precipitation of titanium and aluminum in the process. Therefore, this process will inevitably produce a large amount of ammonia by-product, making storage and transportation difficult

Method used

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  • A method of mineralizing co with ironmaking blast furnace slag <sub>2</sub> Co-production method of alumina
  • A method of mineralizing co with ironmaking blast furnace slag <sub>2</sub> Co-production method of alumina

Examples

Experimental program
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Effect test

example 1

[0026] The chemical composition (mass percentage) of ordinary blast furnace slag used in the test is 38.95% CaO, 10.58% MgO, 13.9% Al 2 o 3 , 34.61% SiO 2 , XRD analysis results show that the main phase in the blast furnace slag is Ca 2 Al 2 SiO 7 and Ca 2 MgSi 2 o 7 ;

[0027] ①. Grind the above-mentioned blast furnace slag to -150 μm and mix it with ammonium sulfate at a mass ratio of 1:2;

[0028] ②. Place the mixture obtained in step ① in a muffle furnace, heat up to 250°C with the furnace and keep it warm for 90 minutes. The ammonia gas generated by the decomposition of ammonium sulfate is absorbed with water. After the reaction is completed, the material is cooled to room temperature and taken out;

[0029] ③. The roasted slag obtained in step ② is soaked in water at 90°C for 60 minutes at a solid-to-liquid ratio (g / ml) of 1:2, and the water-immersed product is filtered to obtain the main component of CaSO 4 , SiO 2 The water leaching residue and the water leac...

example 2

[0038] 1. Adopt the same blast furnace slag as in Example 1. Grinding the blast furnace slag to -75 μm and mixing it with ammonium sulfate at a mass ratio of 1:8;

[0039] ②. Place the mixture obtained in step ① in a muffle furnace, heat up to 450°C with the furnace and keep it warm for 30 minutes. The ammonia gas generated by the decomposition of ammonium sulfate is absorbed with water. After the reaction is completed, the material is cooled to room temperature and taken out;

[0040] ③. The roasted slag obtained in step ② is soaked in water at 80°C for 10 minutes at a solid-to-liquid ratio (g / ml) of 1:4, and the water-immersed product is filtered to obtain the main component of CaSO 4 , SiO 2 The water leaching residue and the water leaching solution rich in Mg and Al;

[0041] 4. Add the ammoniacal liquor in step 2. to the Mg-rich and Al-rich solution in step 3. Control the pH value of the solution to 6, and filter to obtain aluminum hydroxide precipitation and filtrate 1...

example 3

[0049] 1. Adopt the same blast furnace slag as in Example 1. Grind the blast furnace slag to -45 μm and mix it with ammonium sulfate at a mass ratio of 1:5;

[0050] ②. Place the mixture obtained in step ① in a muffle furnace, heat up to 350°C with the furnace and keep it warm for 60 minutes. The ammonia gas generated by the decomposition of ammonium sulfate is absorbed by water. After the reaction is completed, the material is cooled to room temperature and taken out;

[0051] ③. Soak the roasted slag obtained in step ② in water at 20°C for 90 minutes at a solid-to-liquid ratio (g / ml) of 1:10, filter the water-soaked product, and obtain the main component of CaSO 4 , SiO 2 The water leaching residue and the water leaching solution rich in Mg and Al;

[0052] 4. Add the ammoniacal liquor in step 2. to the Mg-rich and Al-rich solution in step 3. Control the pH value of the solution to 7, and filter to obtain aluminum hydroxide precipitation and filtrate 1;

[0053] 5. Add th...

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Abstract

The invention discloses a method for mineralizing CO2 with blast iron slag and co-producing alumina. The method comprises the following steps: (1) evenly mixing blast furnace slag with ammonium sulfate; (2) roasting mixed materials in a muffle furnace to obtain roasted slag and ammonia water obtained by absorbing tail gas during absorption with water; (3) performing water logging to the roasted slag, and filtering to obtain water logging slag containing CaSO4 and SiO2 and water extract rich in Mg and Al; (4) adding ammonium water into liquid rich in Mg and Al, controlling the pH value to obtain parent liquor containing Al(OH)3, Mg(OH)2 and ammonium sulfate; (5) blending the water logging slag into pulp with ammonium water, introducing CO2 for mineralizing reaction, and filtering to obtain mineralized slag containing CaCO3 and SiO2 and mineralized parent liquor containing ammonium sulfate; (6) mixing Mg(OH)2 into slurry with water, mineralizing to obtain MgCO3; (7) calcining Al(OH)3 to obtain byproduct Al2O3; and (8) mixing and evaporating the parent liquor, cooling, crystalizing and recovering ammonium sulfate. According to the method, the conditions are mild, the process cost is low, not only can large-scale CO2 emission reduction be realized, but also valuable element in blast furnace slag can be recovered, and the high-value use of the blast furnace slag can be realized.

Description

technical field [0001] The invention belongs to the field of environmental protection, and more specifically, the invention relates to high-value utilization of blast furnace ironmaking slag and CO 2 emission reduction. Background technique [0002] Since the Industrial Revolution, the massive use of fossil fuels has contributed to atmospheric CO 2 The concentration has risen sharply, and the resulting greenhouse effect has caused global sea levels to rise. Droughts, floods, and extreme cold weather frequently occur, causing great harm to the earth's ecology and human life. At present, China has become the world's largest carbon emitter, and the Chinese government is facing enormous pressure from the national society to reduce emissions. Based on my country's "coal-rich, oil-deficient, and gas-poor" energy structure and the low proportion of non-fossil energy, terminal emission reduction is to achieve CO2 under the condition of maintaining my country's medium-to-high-speed...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00C01F7/26C01F11/18C04B7/14
CPCC01F7/26C01F11/18C04B7/14Y02P40/10
Inventor 李春胡金鹏梁斌岳海荣刘维燥汪霖吕莉谢和平
Owner SICHUAN UNIV