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Dry separation process and system for gasification furnace slag

A sorting system and slag technology, applied in chemical instruments and methods, solid waste removal, transportation and packaging, etc., can solve the problem of poor hydrophobicity of unburned carbon, low recovery efficiency, and failure of high-purity recovery of remaining ash components Utilization and other issues, to achieve the effect of strong process adjustability, improve utilization efficiency, and promote coordinated development

Inactive Publication Date: 2021-06-04
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a gasification slag dry separation process and system to solve the problem of low recovery efficiency of unburned charcoal with poor hydrophobicity in gasification slag and failure of high residual ash components in the existing wet technology. The problem with pure recycling

Method used

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  • Dry separation process and system for gasification furnace slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Pass the gasification slag through a grading sieve with an aperture of 74 μm for particle size classification, the oversize is sent to a ball mill, and the undersize is directly entered into a stage of sorting to separate coarse slag > 74 μm and fine slag ≤ 74 μm;

[0030] (2) Send the coarse-grained slag > 74 μm to a ball mill to grind it below 74 μm;

[0031] (3) Feed the fine-grained slag of ≤74μm into the first-stage sorting system, adopt the friction charging of the electrification chamber, the electrification material is aluminum, adopt the free-falling plate high-voltage electric separation equipment, and set the high-voltage power supply to 40kv to obtain a first-stage separation system. For clean coal, the first-stage tailing coal is sent to the second-stage separation system, and the first-stage medium coal is returned to the electrification device of the first-stage separation to form a circular separation;

[0032] (4) Send a section of tailings coal to ...

Embodiment 2

[0035] (1) Pass the gasification slag through a grading sieve with an aperture of 74 μm for particle size classification, the oversize is sent to a ball mill, and the undersize is directly entered into a stage of sorting to separate coarse slag > 74 μm and fine slag ≤ 74 μm;

[0036] (2) Send the coarse-grained slag > 74 μm to a ball mill to grind it below 74 μm;

[0037] (3) Difference with embodiment 1, the electrification equipment of one section sorting adopts electrification chamber to add friction bar friction electrification, and electrification material is stainless steel, and separation equipment adopts strip separation type, and high-voltage power supply is set to 50kv, obtains a section Clean coal, the tailings of the first stage are sent to the second stage separation system;

[0038] (4) difference with embodiment 1, the electrification equipment of two-stage sorting adopts swirl type friction electrification, and electrification material is copper, and separation e...

Embodiment 3

[0041] (1) Pass the gasification slag through a grading sieve with an aperture of 74 μm for particle size classification, the oversize is sent to a ball mill, and the undersize is directly entered into a stage of sorting to separate coarse slag > 74 μm and fine slag ≤ 74 μm;

[0042] (2) Send the coarse-grained slag > 74 μm to a ball mill to grind it below 74 μm;

[0043] (3) The difference with embodiment 1 is that the electrification equipment of one section of sorting adopts insulating belt corona electrification, the separation equipment adopts strip-shaped separation type, and the high voltage power supply is set to 45kv to obtain one section of clean coal, and one section of tailing coal is sent to the second section sorting system;

[0044] (4) difference with embodiment 1, the electrification equipment of two stage sorting adopts swirling flow type friction electrification, and electrification material is stainless steel, and separation equipment adopts strip separatio...

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Abstract

The invention discloses a dry separation process and system for gasification furnace slag. The dry separation process comprises the following steps of carrying out size grading on the gasification furnace slag, and dividing the gasification furnace slag into the coarse-grain furnace slag of which the particle size is greater than 74 microns and the fine-grain furnace slag of which the particle size is less than or equal to 74 microns according to a separation particle size requirement; crushing the coarse-grain slag and then returning to the size grading step until the coarse-grain slag is changed into the fine-grain slag meeting the separation requirement, and enabling the fine-grain slag to enter a first-section separation system; separating the fine-grain slag into first-section clean coal and first-section tailing coal through an electrification device and separation device for first-section separation, and eanbling first-section middling coal to return in front of the electrification device for first-section separation to form circulating separationon; and separating the first-section tailing coal into second-section clean coal and second-section tailing coal through an electrification device and separation device for second-section separation, and eanbling the second-section middling coal to return in front of the electrification device for second-section separation to form circulating separationon. According to the process, a dry-method electric separation means is adopted, three separation products including the first-section clean coal, the second-section clean coal and the second-section tailing coal can be obtained at the same time, the waste of a large amount of water resources is avoided, and the expensive sewage treatment and product filtering and drying process cost is saved.

Description

technical field [0001] The invention relates to the fields of solid waste treatment and resource recycling, in particular to a gasification furnace slag dry separation system and process. Background technique [0002] Based on my country's basic energy structure characteristics of "more coal, less oil, and gas" and the sustainable development needs of the social economy, under the guidance of the country's new energy strategy, the coal chemical industry continues to grow rapidly, and the output scale is increasing, which is inevitable The area has brought environmental pollution problems such as waste gas, waste water, and waste solids. Among them, the volume of solid waste (90% is coal gasification slag) is huge, and the coal gasification project with a daily processing capacity of one million tons, the total annual gasification slag discharge is as high as 500,000 tons. However, compared with industrial wastewater and waste gas, the utilization and management of solid wast...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00B09B5/00
CPCB09B3/00B09B5/00B09B2101/30
Inventor 何鑫王文峰章新喜杨奕涛孙浩
Owner CHINA UNIV OF MINING & TECH
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