Flotation technology of coal gasification fine slag

A technology of coal gasification and fine slag, applied in flotation, solid separation and other directions, can solve the problems of pollution, waste of energy, consumption of large cultivated land and so on

Inactive Publication Date: 2017-10-31
张晓峰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, coal gasification fine slag is generally disposed of by landfill, which wastes energy, causes pollution, and consumes a lot of cultivated land

Method used

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  • Flotation technology of coal gasification fine slag

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Embodiment Construction

[0025] Combine below figure 1 Describe its specific implementation, a kind of flotation process of coal gasification fine slag, comprises the following steps:

[0026] 1. Coal gasification fine slag enters the pre-processor through belt conveyor or bucket elevator, add 0.05% potassium persulfate, add 0.01% ferrous sulfate heptahydrate, and add water to make the slurry concentration of coal gasification fine slag 20 %, adjust the pH value between 2-11, and the residence time is 15 minutes.

[0027] 2. Remove particles larger than 0.5 through the drum slag separator (rotary sieve).

[0028] 3. Enter the first after-preprocessor, add the diesel oil of 0.5% (diesel oil / slurry weight percent); Then enter the second post-processor and add 0.5% (secondary octanol / slurry weight percent) secondary octanol .

[0029] 4. Coal gasification fine slag slurry and reused filtrate enter the mixing tank at the same time to reduce the concentration of the slurry to 10%. After stirring evenly,...

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Abstract

A flotation process for coal gasification fine slag, comprising the following steps: the coal gasification fine slag enters the preprocessor, adding a flocculant degradation agent and water; after stirring evenly, the particles larger than 0.3-0.5 mm are removed by a drum slag separator ; Then in post-preprocessor, add collector and foaming agent, then enter the flotation machine through the mixing tank for roughing; After dehydration, it enters the refined carbon storage yard through a belt conveyor; while the tail ash of rough selection is swept once to obtain refined carbon and tail ash; the tail ash is concentrated and dehydrated and sent to the wet ash storage yard. The flotation process adopted in the invention can make reasonable use of coal gasification fine slag, and the obtained fine carbon can be used as fuel or for producing active carbon, and the tail ash can be used for building material production. This saves energy and reduces arable land waste.

Description

technical field [0001] The invention relates to a comprehensive utilization method of coal gasification fine slag, in particular to a flotation process of coal gasification fine slag. Background technique [0002] During the coal gasification process, two kinds of slag are produced. One is discharged from the bottom of the gasifier, called coarse slag; the other floats out of the gasifier with the gas, called fly ash. There are two ways to remove fly ash, one is to get fly ash through bag dust removal from coal gas; the other is to remove slag by wet method, such as after flash evaporation and concentration, dehydration by filter press to obtain filter cake, which is called coal gas Fine slag. [0003] At present, coal gasification fine slag is generally disposed of by landfill, which wastes energy, causes pollution, and consumes a lot of cultivated land. [0004] During the settling process of the coal gasification fine slag, a flocculant is added to make the residual ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03D1/02
CPCB03D1/025
Inventor 张晓峰
Owner 张晓峰
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