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Disposal method for hot converter slag

A converter steel slag and disposal method technology, applied in recycling technology and other directions, can solve the problems of prolonging the cooling time, reducing the added value of cold steel slag for iron selection, and reducing the disposal efficiency, so as to reduce the content of free oxides and reduce the difficulty of subsequent disposal. , the effect of increasing the amount of recycling

Inactive Publication Date: 2015-07-15
MCC ENERGY SAVING & ENVIRONMENTAL PROTECTION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The slag discharge temperature of hot converter steel slag is as high as 1300°C, and the sensible heat per ton of slag is about 50-60kg standard coal. Therefore, a large amount of heat energy is released during the cooling process, and the temperature drop is slow. Part of the CaO and MgO in the converter steel slag is composed of free calcium oxide ( In the presence of f-CaO) and free magnesia (f-MgO), it is easy to absorb water and expand (f-CaO and f-MgO expand by 98% and 148% respectively) in steel slag brick making and paving, leading to cracking, which leads to the utilization of steel slag. The root cause of low rate and large stockpile
In addition, the slag discharge temperature of hot steel slag is high, and the cooling process is carried out in the air (mostly water is used as the cooling medium). The heat will prolong the cooling time and reduce the disposal efficiency; the metal Fe in the hot slag will react with the water vapor to produce H 2 , there is a safety hazard in the air
[0005] After searching the literature and patents, no related information about CO containing 2 Relevant literature research and related patents on the disposal method of improving the performance of steel slag after the waste gas is passed into hot steel slag (slag discharge temperature above 1300°C)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Pour 1 ton of hot steel slag at 1550°C produced by the converter into the hot simmering pool, cover it, and pass CO 2 Cylinder will CO 2 Gas (at 25°C, CO 2 The volume content of the composition is 100%) into the heating pool, the inlet pipe is connected to a corner of the heating pool, and the exhaust pipe of the heating pool is arranged at a corner opposite to the heating pool (diagonal to the inlet). While the steel slag is being heated and stewed in water, the CO 2 The total gas flow rate is 20 cubic meters, the gas flow rate is 0.111 cubic meters per minute, the steel slag heating time is 3 hours, and the ventilation is stopped when the temperature of the hot steel slag drops to 25 °C. The test results show that the content of free calcium oxide in the steel slag after thermal stewing is 2.95%, and the recovery of metallic iron is increased by 1%.

Embodiment 2

[0021] Pour 150 tons of 1500°C hot steel slag produced by the converter into the hot simmering tank, cover it, and use the induced draft fan to blow the slag containing CO 2 Composition of exhaust gas (exhaust gas temperature is 200°C, CO 2 The volume content of the composition is 25%) into the hot stew pool, the inlet pipes are connected to the symmetrical four corners of the hot stew pool, and the exhaust pipe of the hot stew pool is arranged in the middle of the hot stew pool. While the steel slag is being heated and stewed in water, the designed waste gas intake is 1200 cubic meters in total, and the gas flow rate is 40 cubic meters per 0.5h; the rate of intake is 8 cubic meters. m / min, and the ventilation is completed within 10 minutes; the steel slag heating time is 15 hours, and the ventilation is stopped when the temperature of the hot slag drops to 200°C. The test results show that the content of free calcium oxide in the steel slag after thermal stewing is 2.0%, and...

Embodiment 3

[0023] Pour 30 tons of 1300°C hot steel slag produced by the converter into the unloadable pool, then transport the small pool to a cylindrical hollow container through the transportation equipment, seal it, and use the induced draft fan to drain the small pool containing CO 2 Composition of exhaust gas (exhaust gas temperature is 80°C, CO 2 The composition volume content is 52.8%) into the hollow container, the inlet pipe is connected to the middle of the bottom of the cylindrical equipment on one side, and the exhaust pipe is arranged on the other side of the middle of the cylindrical equipment. At the same time as the hot steel slag is soaked in water, the design waste gas intake is 900 cubic meters in total, the gas flow rate is 2.5 cubic meters per minute, the steel slag is simmered for 6 hours, and the hot slag temperature drops to 180 ° C. Stop ventilation. The test results show that the content of free calcium oxide in the steel slag after thermal stewing is 1.95%, an...

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Abstract

The invention relates to a disposal method for hot converter slag, in particular to a disposal method for introducing a gas containing CO2 into hot converter slag, so as to improve the performance of the slag. A certain amount of gas containing CO2 is introduced in a cooling disposal process of the hot converter slag according to the components of the slag, so that dual targets of reducing the free calcium oxide content in the slag and improving the metal recovery amount are realized; the disposal efficiency of the hot converter slag is improved; and the application performance of the slag is improved, so that disposal of the hot converter slag is realized, and the overall performance of subsequent product utilization is improved.

Description

technical field [0001] The invention belongs to the fields of metallurgy, environmental protection and building materials, in particular to a 2 A disposal method for improving the properties of steel slag after waste gas is fed into hot converter steel slag. Background technique [0002] Greenhouse gases are the main cause of global climate change, CO 2 Gases account for the largest proportion of greenhouse gases. In 2013, my country's carbon emissions reached 10 billion tons, making it the country with the largest carbon emissions. my country attaches great importance to carbon emission reduction. At the Copenhagen Conference, it promised to the world that by 2020, carbon emissions per unit of GDP will be reduced by 40% to 50% compared with 2005, and carbon emissions per unit of GDP will be reduced by 17% during the "Twelfth Five-Year Plan" period. However, carbon emission reduction does not mean reducing the speed of economic development. The development of "low-carbon e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B3/06
CPCY02W30/50
Inventor 岳昌盛杨景玲彭犇夏春韩志强吴龙张硕郑琦李正东王帅
Owner MCC ENERGY SAVING & ENVIRONMENTAL PROTECTION
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