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Method for improving iron removal effect of glass-phase coal-series waste by adopting microwave pretreatment

A pretreatment and glass phase technology, applied in chemical instruments and methods, magnetic separation, solid separation, etc., can solve the problems of large stockpiles, unbalanced development of comprehensive utilization areas, and low added value of products, and achieve simple and convenient operation methods Effect

Pending Publication Date: 2021-10-15
ZHENGZHOU MINERALS COMPOSITIVE UTILIZATION RES INST CHINESE GEOLOGICAL ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are still problems such as unbalanced regional development of comprehensive utilization, large stockpiles, and low added value of comprehensive utilization products, especially in Northwest my country, where the comprehensive utilization of fly ash is severely restricted by the low added value of its products

Method used

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  • Method for improving iron removal effect of glass-phase coal-series waste by adopting microwave pretreatment
  • Method for improving iron removal effect of glass-phase coal-series waste by adopting microwave pretreatment

Examples

Experimental program
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Effect test

Embodiment 1

[0031] A method for improving the iron removal effect of glass-phase coal-measure waste by using microwave pretreatment, comprising the following steps:

[0032] (1) The glass-phase coal waste is removed by a magnetic separator, and the magnetic separation operation adopts a periodic pulsating high-gradient magnetic separator with a magnetic field strength of 6000Gs to obtain non-magnetic products;

[0033] (2) Microwave pretreatment is performed on the non-magnetic products after magnetic separation using a microwave oven. Microwave oven pretreatment: heating to a temperature of 100°C, a processing time of 10 minutes, and a microwave power of 1000W;

[0034] (3) The microwave-treated product is finely ground, and the fine grinding method adopts shear force crushing. The equipment is a grinder, and the grinding time is 18 minutes. The finely ground product is pickled, and finally the product after pickling is washed and filtered to obtain the whole Low iron products with less ...

Embodiment 2

[0037] A method for improving the iron removal effect of glass-phase coal-measure waste by using microwave pretreatment, comprising the following steps:

[0038] (1) The glass-phase coal waste is removed by a magnetic separator, and the magnetic separation operation adopts a periodic pulsating high-gradient magnetic separator with a magnetic field strength of 10000Gs to obtain non-magnetic products;

[0039] (2) Microwave pretreatment is performed on the non-magnetic products after magnetic separation using a microwave oven. Microwave oven pretreatment: heating to a temperature of 500°C, a processing time of 5 minutes, and a microwave power of 700W;

[0040] (3) The microwave-treated product is finely ground, and the fine grinding method adopts shear force crushing. The equipment is a grinder, and the grinding time is 24 minutes. Low iron products with less than 0.2% iron.

[0041] In step (3), hydrochloric acid solution with a molar concentration of 0.5 mol / L is used for pic...

Embodiment 3

[0043] A method for improving the iron removal effect of glass-phase coal-measure waste by using microwave pretreatment, comprising the following steps:

[0044] (1) The glass-phase coal-based waste is passed through a magnetic separator to remove magnetic substances. The magnetic separation operation adopts a dry-type induction roller strong magnetic separator with a magnetic field strength of 15000Gs to obtain non-magnetic products;

[0045](2) Microwave pretreatment is performed on the non-magnetic products after magnetic separation using a microwave oven. Microwave oven pretreatment: heating to a temperature of 400°C, a processing time of 8 minutes, and a microwave power of 800W;

[0046] (3) The microwave-treated product is finely ground, and the fine grinding method adopts shear force crushing. The equipment is a grinder, and the grinding time is 24 minutes. Low iron products with less than 0.2% iron.

[0047] In step (3), hydrochloric acid solution with a molar concent...

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Abstract

The invention provides a method for improving the iron removal effect of glass-phase coal-series waste through microwave pretreatment. The glass-phase coal-series waste is mainly waste such as fly ash and coal-fired furnace slag which are generated after coal is used as fuel and subjected to high-temperature combustion. The method comprises the following steps: (1) removing magnetic substances from the glass-phase coal-series waste through magnetic separation operation to obtain a non-magnetic product; (2) performing microwave pretreatment on the non-magnetic product; and (3) performing fine grinding-acid pickling operation on the product subjected to microwave treatment to obtain a low-iron product of which the total iron content is lower than 0.2%. The method is used for removing iron from the glass-phase coal-series waste such as the fly ash and the furnace slag, the grade of TFe in a low-iron product can be reduced to 0.10%, the effect is remarkable, and the problem that the high value of the glass-phase coal-series waste such as the fly ash and the coal-series furnace slag is limited by too high iron impurity content is solved.

Description

technical field [0001] The invention relates to the technical field of non-metallic dressing and smelting, in particular to a method for improving the iron removal effect of glass-phase coal series waste by adopting microwave pretreatment. Background technique [0002] Glass-phase coal-based waste refers to coal ash and coal-fired slag produced during high-temperature combustion using coal as fuel, mainly fly ash from power plants, and is a large industrial solid waste. Fly ash refers to the fine ash collected from the flue gas after coal combustion, and is the main solid waste discharged from coal-fired power plants. my country is a large coal-producing country, and coal is used as the basic fuel for electric power production. The total amount of fly ash discharged by my country's coal-fired thermal power plants is increasing year by year. In 1995, the discharge of fly ash reached 125 million tons. In 2000, it was about 150 million tons. By 2010, it will reach 300 million ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03C1/30
CPCB03C1/30
Inventor 刘玉林刘长淼赵毅谭琦冯乃琦
Owner ZHENGZHOU MINERALS COMPOSITIVE UTILIZATION RES INST CHINESE GEOLOGICAL ACAD
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