Flotation column process for separating carbon residue in fly ash

A flotation column, fly ash technology, applied in flotation, solid separation and other directions

Inactive Publication Date: 2005-06-29
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is to provide a flotation column process for separating residual carbon in fly ash, which solves the corresponding environmental problems caused by excessive residual carbon content in fly ash and the problem of comprehensive utilization of fly ash, and proposes a Low-cost, simple process and high-efficiency fly ash flotation carbon removal process

Method used

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  • Flotation column process for separating carbon residue in fly ash
  • Flotation column process for separating carbon residue in fly ash

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Embodiment Construction

[0023] Here, the present invention is further illustrated by examples. The fly ash of a certain coal-fired power plant in Shanxi is selected, which is characterized by a high loss on ignition index (18%-20%), and its chemical composition is shown in Table 1. Attached figure 2 The process flow shown is for flotation separation.

[0024] Table 1 The chemical composition and ignition loss of the fly ash used

[0025] SiO 2 (%) Al 2 o 3 (%) CaO (%) Fe 2 o 3 (%) MgO (%) SO 3 (%) LOI

[0026] 56.24 28.70 2.08 3.89 0.79 0.23 16.98

[0027] slurry preparation

[0028]To prepare materials in the slurry mixing tank, first add a given amount of clear water, and then turn on the power of the agitator for stirring. During this process, add the pre-measured feed fly ash, and the feed concentrations are 2.75, 5.43, 7.67 and 12.79wt. .%. Stir for 5 minutes first, then add collector (light diesel oil) during the stirring process, continue stirring for 5 minutes, st...

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Abstract

The invention offers a kind of craft for separating pillars in the coal powder. It includes three parts of mineral liquid preparation, pillar separate choosing, and product off water. It uses double liquid pillar and material and water-off equipment, and then makes the pillar-box press filter craft, taking off the carbon grains not fired in the coal powder. Put the high carbon coal and water into the mixing bucket, through mixing the mineral liquid is made, transfer it to the entrance of pillar, by the separating choosing, we get pure mineral and the mineral coal powder, through box press filter machine, we get the carbon product and coal powder product. The advantages of the invention are: simple craft, little cost, little energy, and repair little, operating cost little.

Description

technical field [0001] The invention belongs to the technical field of mineral separation, and in particular provides a flotation column technology for separating residual carbon in fly ash. Background technique [0002] The design of the invention is based on the prevention and control technology of environmental pollution and the practical technology of comprehensive utilization of mineral resources, mainly the technology and process of removing unburned residual carbon in fly ash. As a product of pulverized coal combustion, fly ash is affected by raw materials and combustion conditions, and the undisturbed ash will more or less contain unburned organic matter, that is, unburned residual carbon. The excessive unburned carbon content in fly ash not only brings corresponding environmental problems, but also restricts the application of fly ash in many fields. [0003] The total annual discharge of fly ash in the world is more than 500 million tons. And our country is more ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03D1/00
Inventor 王立刚谢华
Owner UNIV OF SCI & TECH BEIJING
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