Method for modifying red mud and method for decoking and desulfurizing in organic solid waste pyrolysis gasification process

A technology of organic solid waste, pyrolysis gasification, applied in chemical instruments and methods, solid waste removal, transportation and packaging, etc., can solve problems such as water and soil pollution, red mud metal waste and other problems

Active Publication Date: 2021-06-01
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the comprehensive utilization rate of red mud in my country is less than 5%, and it is still mainly stored in the form of damming. On the one hand, this has caused a waste of valuable metals in red mud; A large amount of stacking will cause serious water and soil pollution problems

Method used

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  • Method for modifying red mud and method for decoking and desulfurizing in organic solid waste pyrolysis gasification process
  • Method for modifying red mud and method for decoking and desulfurizing in organic solid waste pyrolysis gasification process
  • Method for modifying red mud and method for decoking and desulfurizing in organic solid waste pyrolysis gasification process

Examples

Experimental program
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Effect test

Embodiment 1

[0051] 1) The method of modifying red mud includes: weighing 5g of dry red mud powder and placing it in a 100mL beaker, according to the molar content of sodium in the red mud, accurately weigh 1.024g of Add calcium oxide into the beaker, pour 60.2mL deionized water into the beaker according to the solid-to-liquid mass ratio of 1:10, place the beaker containing the mixture of red mud and calcium oxide on a magnetic stirrer, and stir at 100r / min , fully stirred for 30 minutes; then pour the uniformly mixed suspension into a hydrothermal reaction kettle, and put the sealed reaction kettle in an oven at 80°C for 24 hours; then pour the hydrothermally treated product into the rotary evaporator Vacuum drying is carried out in the evaporating flask, the drying temperature is 50°C, and the rotation speed is 100r / min; the dried modified red mud is ground and sieved into particles with a particle size of less than 63 μm, and the modified red mud obtained through this process is named HT...

Embodiment 2

[0056] 1) The method of modifying red mud includes: weighing 4g of dry red mud powder and placing it in a 100mL beaker, and accurately weighing 1.638g of red mud according to the molar content of sodium in the red mud with a sodium / calcium molar ratio of 1:4 Add calcium oxide into the beaker, pour 58.8mL deionized water into the beaker according to the solid-to-liquid mass ratio of 1:10, place the beaker containing the mixture of red mud and calcium oxide on a magnetic stirrer, and stir at 100r / min , fully stirred for 30 minutes; then pour the uniformly mixed suspension into a hydrothermal reaction kettle, and put the sealed reaction kettle in an oven at 80°C for 24 hours; then pour the hydrothermally treated product into the rotary evaporator Vacuum drying is carried out in the evaporating flask, the drying temperature is 50°C, and the rotation speed is 100r / min; the dried modified red mud is ground and sieved into particles with a particle size of less than 63 μm, and the mod...

Embodiment 3

[0059] 1) The method of modifying red mud includes: weighing 3.5g of dry red mud powder and placing it in a 100mL beaker. According to the molar content of sodium in the red mud, accurately weigh 2.151g according to the sodium / calcium molar ratio of 1:6 Add calcium oxide into the beaker, pour 56.4mL deionized water into the beaker according to the solid-to-liquid mass ratio of 1:10, place the beaker containing the mixture of red mud and calcium oxide on a magnetic stirrer, and stir at 100r / min speed, fully stirred for 30 minutes; then pour the uniformly mixed suspension into a hydrothermal reaction kettle, put the sealed reaction kettle in an oven at 80°C for 24 hours; then pour the hydrothermally treated product into a rotary evaporator Vacuum drying is carried out in a evaporating flask, the drying temperature is 50°C, and the rotation speed is 100r / min; the dried modified red mud is ground and sieved into particles with a particle size of less than 63 μm, and the modified re...

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Abstract

The invention discloses a method for modifying red mud and a method for decoking and desulfurizing in an organic solid waste pyrolysis gasification process, wherein the method for modifying the red mud comprises the following steps of mixing the red mud, calcium oxide and/or calcium hydroxide and water, and carrying out hydrothermal reaction; and carrying out drying treatment on the mixed solution after the hydrothermal reaction so as to obtain modified red mud. According to the method, the alkaline catalytic activity of the red mud is improved by doping calcium oxide and/or calcium hydroxide into the red mud and reinforcing sodium displacement through a hydrothermal method, and meanwhile, the desulfurization performance of the red mud is also improved by introducing calcium, so that the modified red mud has double effects of catalytic decoking and desulfurization; and when the method is applied to the organic solid waste pyrolysis gasification process, the yield of combustible gas can be further increased, sulfur-containing gas pollutants such as H2S generated in the reaction can be reduced, a new way is opened up for resource utilization of the red mud, and the method is suitable for large-scale popularization.

Description

technical field [0001] The invention belongs to the technical field of organic solid waste pyrolysis, and specifically relates to red mud modification and a method for removing coke and desulfurization in the pyrolysis gasification process of organic solid waste. Background technique [0002] Red mud (red mud, RM) is a solid waste produced in the aluminum smelting industry. According to the red mud obtained without bauxite treatment process, it can be divided into Bayer red mud, sintering red mud, and mixed red mud. Among them, Bayer French red mud contains 10% to 60% Fe 2 o 3 , 5% to 20% Al 2 o 3 , 3% to 20% SiO 2 And some alkali metals, alkaline earth metals. At present, the comprehensive utilization rate of red mud in my country is less than 5%, and it is still mainly stored in the form of damming. On the one hand, this has caused a waste of valuable metals in red mud; A large number of piles will cause serious water and soil pollution problems. Therefore, it is of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00
CPCB09B3/00B09B2101/02B09B3/40
Inventor 赵明崔晓敏吕熠
Owner TSINGHUA UNIV
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