Modified red mud, its modification method and catalyst suitable for direct coal liquefaction

A technology of modifier and catalytic aid, applied in the field of direct coal liquefaction catalyst and modified red mud, can solve problems such as unsatisfactory utilization effect of red mud, and achieve cheap and efficient catalyst, large specific surface area and good dispersion. Effect

Active Publication Date: 2018-05-25
CHNA ENERGY INVESTMENT CORP LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But most of them are still in the experimental stage, and the utilization effect of red mud is not ideal

Method used

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  • Modified red mud, its modification method and catalyst suitable for direct coal liquefaction
  • Modified red mud, its modification method and catalyst suitable for direct coal liquefaction
  • Modified red mud, its modification method and catalyst suitable for direct coal liquefaction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Take 100g of Guangxi No. 1 red mud, add 400g of deionized water, stir evenly, slowly add sulfuric acid solution with a mass concentration of 50%, until the pH value of the slurry is less than 0.5 and does not rise anymore, transfer the slurry to a centrifuge for centrifugation Filter to collect the acidic filtrate.

[0052] To this acidic filtrate was added 78.5 g FeSO 4 ·7H 2 O, after stirring and dissolving, slowly add 2wt% ammonia solution dropwise, and feed air at the same time until the pH value of the solution remains constant at 8.0, filter the slurry, and wash the filter cake until the conductivity of the filtrate is less than 1000 μm / cm. Place in a 120-degree drying oven to dry for 12 hours, grind to less than 50um, and prepare 1# modified red mud catalyst.

Embodiment 2

[0054] The implementation method is similar to Example 1, the difference is that the Guangxi No. 2 red mud is used, and 45.8g FeSO is added in the acidic filtrate 4 ·7H 2 O, the modified red mud catalyst number is 2#.

Embodiment 3

[0056] The implementation method is similar to Example 1, the difference is that Shandong red mud is used, and 23.6g FeSO is added in the acidic filtrate 4 ·7H 2 O, the number of the modified red mud catalyst is 3#.

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Abstract

The invention provides a modified red mud, its modification method and a catalyst suitable for direct coal liquefaction. The modified red mud includes FeOOH; and a hydroxide mixture dispersed between FeOOH, wherein the content of Fe element in FeOOH in the modified red mud is 30wt% to 55wt%, and the hydroxide mixture consists of Al element, Ca element and the hydroxide composition of Mg element respectively. By converting iron in red mud into iron oxyhydroxide, and controlling the content of iron in the range of 30wt% to 55wt%, while removing Si and Ti elements in red mud, while retaining elements such as Al, Ca and Mg and It is converted into hydroxide and dispersed between FeOOH to play the role of separation and dispersion, so that the particle size of FeOOH is smaller, the specific surface area is larger, and the dispersion is good, so that the modified red mud has a higher Catalytic activity for direct coal liquefaction.

Description

technical field [0001] The invention belongs to the field of comprehensive treatment of red mud, and specifically relates to a modified red mud, a modification method thereof and a catalyst suitable for direct coal liquefaction. Background technique [0002] Red mud is the polluting waste slag discharged when the aluminum industry extracts alumina. Generally, for every ton of alumina produced, 0.8 to 1.5 tons of red mud are incidentally produced. my country is the fourth largest producer of alumina in the world, and produces more than 30 million tons of red mud every year. At present, the comprehensive utilization rate of red mud in our country is only about 4%, and most of them can only be stacked in large-area storage yards, occupying a lot of land and causing serious pollution to the environment, so the output and harm of red mud should be minimized , It is imminent to realize multi-channel and large-scale resource utilization. [0003] A lot of research has been done o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/78B01J23/888B01J23/887C10G1/06
Inventor 谢晶李克健章序文王洪学高山松
Owner CHNA ENERGY INVESTMENT CORP LTD
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