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Method for removing impurity iron in gasification slag

A gasification slag and impurity technology, applied in chemical instruments and methods, solid separation, magnetic separation, etc., can solve problems such as reducing product performance and quality, hindering high-value conversion of resources, affecting product appearance and color, and achieving economic and environmental protection. Significant benefits, no waste liquid discharge effect

Active Publication Date: 2020-04-24
CHINA PETROLEUM & CHEM CORP +3
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  • Claims
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Problems solved by technology

However, in the material preparation process, excessive iron content not only affects the appearance and color of the product, but also seriously reduces the product performance and quality, hindering the high-value conversion of its resources
In view of the high iron content in gasification slag, due to the complex and uniform distribution of iron mineral phases in gasification slag, no systematic and reliable iron removal method has been formed yet.

Method used

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  • Method for removing impurity iron in gasification slag

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Effect test

Embodiment 1

[0022] Such as figure 1 As shown, the removal method of impurity iron in gasification slag in the present embodiment comprises the following steps:

[0023] High-temperature carbothermal reduction process: put the gasification slag in a high-temperature furnace, pass in argon to ensure that it is in a reducing atmosphere, raise the temperature from room temperature to 800°C at a rate of 9°C / min, and keep it for 1 hour; further increase the temperature at 4°C / min The heating rate was raised to 1250°C in min, kept for 3 hours, and cooled to room temperature;

[0024] Magnetic separation process: Magnetic separation and iron removal are carried out under the condition of a magnetic field strength of 3000Gs;

[0025] The iron content in the iron removal slag obtained is reduced from 9% to 1.82%, the iron removal rate is as high as 80%, and the slag loss is 17%.

Embodiment 2

[0027] Such as figure 1 As shown, the removal method of impurity iron in gasification slag in the present embodiment comprises the following steps:

[0028] High-temperature carbothermal reduction process: put the gasification slag in a high-temperature furnace, pass in argon to ensure that it is in a reducing atmosphere, raise the temperature from room temperature to 650 °C at a rate of 8 °C / min, and keep it for 1 hour; further increase the temperature at 3 °C / min The heating rate was raised to 1250°C in min, kept for 2.5 hours, and cooled to room temperature;

[0029] Magnetic separation process: Magnetic separation and iron removal are carried out under the condition of a magnetic field strength of 3500Gs;

[0030] The iron content in the iron removal slag obtained is reduced from 9% to 2.33%, the iron removal rate is as high as 74%, and the slag loss is 21%.

Embodiment 3

[0032] Such as figure 1 As shown, the removal method of impurity iron in gasification slag in the present embodiment comprises the following steps:

[0033] High-temperature carbothermal reduction process: put the gasification slag in a high-temperature furnace, pass in hydrogen to ensure that it is in a reducing atmosphere, raise the temperature from room temperature to 750°C at a rate of 6°C / min, and keep it for 1.5h; further increase the temperature at 4°C / min The heating rate was raised to 1200°C in min, kept for 3 hours, and cooled to room temperature;

[0034] Magnetic separation process: Magnetic separation and iron removal are carried out under the condition of a magnetic field strength of 4000Gs;

[0035] The iron content in the iron removal slag obtained is reduced from 9% to 1.74%, the iron removal rate is as high as 81%, and the slag loss is 18%.

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Abstract

The invention relates to a method for removing impurity iron in gasification slag. The method sequentially comprises a high-temperature carbon thermal reduction process and a magnetic separation ironremoval process. According to the invention, the mineral phase structure and element composition characteristics of the gasification slag are utilized; carbon contained in the gasification slag is used as a reducing agent; the iron element in the gasification slag is efficiently dissociated and fully reduced through staged temperature rise control, so that the mineral phase is converted into a stable mullite-quartz mineral phase; the impurity iron is separated out through magnetic separation treatment; the method is rapid and efficient; in the whole process, no toxic or harmful components areused, and no waste liquid is discharged; and the economic and environmental benefits are remarkable.

Description

technical field [0001] The invention relates to the technical field of resource utilization of inorganic chemical industry solid waste, in particular to a method for removing impurity iron in gasification slag. Background technique [0002] Coal is mainly used for thermal power generation, and its proportion is as high as more than 60%. The added value of organic resource utilization is low, and it has caused serious problems such as air, soil, and water pollution. Based on the above problems, coal gasification technology has received extensive attention in recent years. The organic carbon in coal is synthesized into organic products (such as ethanol, methane, etc.) through gasification modification technology, which greatly improves the utilization rate and added value of organic resources. The waste slag produced by this process has complex composition / mineral phase structure and is difficult to utilize. [0003] At present, the utilization of gasification slag is mainly ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/00B03C1/015B03C1/02
CPCB03C1/015B03C1/02C21B13/00
Inventor 李少鹏孙志刚杨宏泉郭强李会泉张建波胡文豪胡力蒋超邵迪
Owner CHINA PETROLEUM & CHEM CORP
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