Method for recycling coal ashes in power plant

A technology for power plant fly ash and carbon powder, applied in the directions of silicon dioxide, calcium/strontium/barium oxide/hydroxide, iron oxide, etc., can solve the problems of low price and insufficient recycling degree.

Inactive Publication Date: 2012-07-04
贵州绿水青山环保科技有限公司
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Problems solved by technology

In the prior art, fly ash is usually used as an admixture for concrete and a fille...

Method used

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Embodiment Construction

[0008] Embodiment 1 of the present invention. Power plant fly ash recycling method, the power plant fly ash is crushed, ball milled, passed through a 24-mesh sieve, and flotation is carried out through the existing flotation equipment to separate carbon powder, and a reducing agent is added to the raw material after flotation to remove iron The particles are reduced to magnetite particles, and iron-containing products are obtained through magnetic separation by existing magnetic separation equipment. The reducing agent added may be sodium dithionate, zinc dithionate or sodium borohydride. After testing, sodium dithionate has the best reduction effect, preferably sodium dithionite.

[0009] The remaining material after magnetic separation is finely ground again, passed through a 60-mesh sieve, and separated by flotation to separate silicon dioxide and calcium oxide, and obtain alumina as the rest. Ability to separate silica and calcium oxide by flotation.

[0010] Embodiment...

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Abstract

The invention discloses a method for recycling coal ashes in a power plant, wherein the coal ashes in the power plant are crushed, ball-milled and sieved by a 24-mesh sieve; the method is characterized in that carbon dust is separated by floatation, reducing agent is added into a floated raw material, particles containing iron are reduced into magnetite particles, and an iron-containing product is obtained by magnetic separation. According to the method for recycling the coal ashes in the power plant, the carbon dust is firstly separated by floatation, then the coal ashes are reduced to reduce iron oxide into magnetite, the magnetite is then separated by magnetic separation, the iron oxide is effectively separated, and the product obtained by separation can be sold as an iron-making raw material. Excess materials subjected to magnetic separation are then finely grinded again, so that silica, calcium oxide and aluminum oxide are then separated by floatation. The silica and the calcium oxide can be used as building materials, and the aluminum oxide can be sold to an electrolytic aluminium factory. According to the method for recycling the coal ashes in the power plant, after main constituents of the coal ashes are separated, various materials can be conveniently processed for a second time, so that the value of the product is greatly improved.

Description

technical field [0001] The invention relates to a method for recycling fly ash of a power plant, and belongs to the technical field of fly ash recycling of a power plant. Background technique [0002] Power plant fly ash refers to the dust waste collected during the production process of power plants. my country is a large coal-producing country, and coal is used as the basic fuel for electric power production. In recent years, my country's energy industry has developed steadily, with an annual growth rate of 7.3% in power generation capacity. The rapid development of the power industry has brought about a sharp increase in fly ash emissions. The total fly ash emitted by coal-fired thermal power plants every year The amount of fly ash is increasing year by year. In 1995, the discharge of fly ash reached 125 million tons, in 2000 it was about 150 million tons, and by 2010 it will reach 300 million tons, which has caused huge pressure on my country's national economic construc...

Claims

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Application Information

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IPC IPC(8): C01B33/12C01F7/02C01F11/02C01G49/06B09B3/00
Inventor 邹建明阮正林
Owner 贵州绿水青山环保科技有限公司
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