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Preparation method of silicon carbide from blast furnace water quenching slag and waste activated carbon

A technology of blast furnace water quenching slag and waste activated carbon, which is applied in the direction of silicon carbide and carbide, can solve the problems of high industrial value, large amount of industrial wastewater discharge, and potential safety hazards, so as to reduce production costs, large industrial application value, and use wide range of effects

Active Publication Date: 2018-04-20
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Activated carbon is used for industrial wastewater treatment, and the discharge of industrial wastewater in our country is huge. Most of the waste activated carbon after wastewater treatment is treated as garbage and chooses to be incinerated or landfilled, which directly causes economic and resource waste. At present, there are many reports in the literature It is the regeneration and utilization of activated carbon, but after repeated regeneration and activation, the adsorption performance of activated carbon will gradually decrease or even become invalid.
[0005] Combined with the status quo of blast furnace water quenching slag and waste activated carbon treatment, the simple and rough treatment method has caused huge economic losses and waste of resources. At the same time, there are certain safety hazards, which will damage the ecological environment and drinking water safety, etc.
At the same time, secondary resources such as gold mine tailings and waste activated carbon have not been efficiently utilized, and high industrial value has not been created.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1) Crushing and grinding the water-quenched slag of iron and steel smelting blast furnace to -400 mesh, drying at 300°C for 24h; Water-quenched slag: waste activated carbon = 1:2, mix the two powders evenly to obtain mixed powder;

[0037] 2) According to the mass ratio, the mixed powder: hydrochloric acid solution = 1:5; the mixed powder obtained in step 1) is dispersed in the hydrochloric acid solution (the concentration of hydrogen ions is 3mol / l), at a temperature of 90°C Stir for 10 hours at a stirring speed of 300r / min, filter for solid-liquid separation, and repeat the above operations several times for the filter residue, then clean the filter residue until the pH value of the lotion is 6.8-7.2, remove soluble ions and impurities from the mixture, and filter the obtained filter residue Dry at a temperature of 300°C for 24 hours, and wait for all the moisture inside to evaporate to obtain a spare filter residue;

[0038] 3) Put the spare filter residue obtained ...

Embodiment 2

[0040]1) Crushing and grinding the water-quenched slag of the iron and steel smelting blast furnace to -300—+400 mesh, drying at 100°C for 8 hours, treating the waste activated carbon at 1000°C for 1 hour under the protection of an inert atmosphere, and cooling it out Drying, water quenching slag according to the mass ratio: waste activated carbon = 1:0.5 and uniformly mix the two powders to obtain a mixed powder;

[0041] 2) According to the mass ratio, mixed powder: sulfuric acid solution = 1:5, disperse the mixed powder obtained in step 1) in sulfuric acid solution (the concentration of hydrogen ions is 5mol / l), at a temperature of 70°C Stir for 4 hours, the stirring speed is 100r / min, filter the solid-liquid separation, and repeat the above operation for the filter residue several times, clean the filter residue until the pH value of the lotion is 6.8-7.2, remove the soluble ions and impurities in the mixture, and the obtained powder The material was dried at a temperature...

Embodiment 3

[0044] 1) Crushing and grinding the water-quenched slag of the iron and steel smelting blast furnace to -300 mesh, drying at 200°C for 12 hours; treating the spent activated carbon at 1000°C for 1 hour under the protection of an inert atmosphere, cooling, taking out and drying. After its quality is no longer changed at the oven temperature, the two powders are uniformly mixed according to the mass ratio of water quenching slag: waste activated carbon=1:1.5 to obtain a mixed powder;

[0045] 2) According to the mass ratio, the mixed powder: sulfuric acid solution = 1:10, the mixed powder obtained in step 1) is dispersed in the sulfuric acid solution (the concentration of hydrogen ions is 4mol / l), at a temperature of 80°C Stir for 6 hours at a stirring speed of 200r / min, filter the solid-liquid separation, and repeat the above operation for the filter residue 3 times, clean the filter residue until the pH value of the washing liquid is 6.8-7.2, remove the soluble ions and impurit...

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Abstract

The invention discloses a preparation method of silicon carbide from blast furnace water quenching slag and waste activated carbon. The preparation method comprises the following steps: preparing materials of the blast furnace water quenching slag and the waste activated carbon in a mass ratio of 1: (0.5 to 2) and mixing uniformly to obtain a mixture A; placing the mixture A in an acid solution Bin a mass ratio of 1: (5 to 10), stirring at least for 4 h at the temperature of 70 to 90 DEG C, filtering and cleaning filter residues; and drying the filter residues to obtain backup filter residues, heating the backup filter residues to the temperature of 1400 to 1700 DEG C in inert or reducing atmosphere and carrying out heat preservation for 3 to 10 h and then lowering the temperature to 600to 900 DEG C, carrying out heat preservation for 3 to 5 h in oxidizing atmosphere, and performing acid pickling to obtain silicon carbide powder. The silicon carbide obtained by the invention has highpurity, small particle size, narrow distribution, and good industrial application values. Furthermore, the blast furnace water quenching slag and the waste activated carbon are taken as the raw materials, thereby being of positive significance in the aspects of reducing waste pollution, protecting environments and recycling resources.

Description

technical field [0001] The invention relates to a method for preparing silicon carbide from blast furnace water-quenched slag and waste activated carbon, in particular to the technical field of high-efficiency utilization of iron and steel blast furnace water-quenched slag combined with industrial waste. Background technique [0002] Blast furnace water quenching slag is a fusible mixture composed of gangue in ore, ash in fuel, non-volatile components in flux and other impurities that cannot enter pig iron during blast furnace ironmaking. scum. Of which SiO 2 , C content reaches more than 60%. In 2016, my country's steel output exceeded 250 million tons, and the annual output of blast furnace slag was close to 80 million tons. At present, the accumulated blast furnace slag in the slag field has exceeded 100 million tons, and metallurgical enterprises spend tens of millions of dollars every year due to the waste slag. The hoarded blast furnace water-quenched slag has many ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/97
CPCC01P2004/51C01P2004/61C01P2006/80
Inventor 肖劲张留运唐雷田忠良赖延清
Owner CENT SOUTH UNIV
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