Method for treating blast furnace slag

A technology of blast furnace slag and storage tank, which is applied in the field of blast furnace slag treatment in iron and steel plants, can solve the problems that cannot fundamentally change the water consumption process characteristics of granulated slag, affect the performance of blast furnace slag, and lose physical heat of slag, so as to save slag flushing water resources, improve the level of comprehensive utilization, and improve the effect of benefits

Inactive Publication Date: 2012-03-21
WISDRI ENG & RES INC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The water flushing slag method cannot fundamentally change the process characteristics of water consumption of granulated slag, the physical heat of the slag is basically lost, and the SO 2 、H 2 The discharge of pollutants such as S not only affects the working environment but also pollutes the air.
[0004] In terms of waste heat recovery from blast furnace slag, the recovery and utilization of waste heat from water flushing slag in C...

Method used

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  • Method for treating blast furnace slag
  • Method for treating blast furnace slag

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Effect test

Embodiment 1

[0017] A method for processing blast furnace slag, the steps of which are:

[0018] 1) The chemical composition and weight percentage are: SiO 2 : 35%, CaO: 40%, Al 2 o 3 : 15%, MgO: 9%, S: 0.9%, FeO: 0.4%, the rest are other trace elements and impurities, and the blast furnace slag melt whose temperature is 1450°C is mixed with quicklime containing 53% by weight of calcium oxide at the same time Put it into a storage tank with a heat exchanger and mix it; the temperature in the storage tank is kept at 1200-1210 °C; and the basicity R of the mixed material is controlled at 2.0, and the weight percentage of magnesium oxide is 9.8%; according to the mixed The basicity R of the material is required to be 2.0. After calculation, quicklime containing 53% by weight of calcium oxide is added at 580 kg per ton of blast furnace slag; the composition of the slag phase falls between CaO-SiO 2 -Al 2 o 3 - the calcium orthosilicate phase region of the MgO phase diagram;

[0019] 2) C...

Embodiment 2

[0022] A method for processing blast furnace slag, the steps of which are:

[0023] 1) The chemical composition and weight percentage are: SiO 2 : 36%, CaO: 39%, Al 2 o 3 : 13%, MgO: 10%, S: 0.6%, FeO: 0.5%, and the rest are other trace elements and impurities, and the blast furnace slag melt whose temperature is 1430°C is mixed with quicklime containing 90% by weight of calcium oxide at the same time Put it into a storage tank with a heat exchanger and mix it; the temperature in the storage tank is kept at 1250-1260 °C; and the basicity R of the mixed material is controlled at 2.05, and the weight percentage of magnesium oxide is 9.2%; according to the mixed The basicity R of the material is required to be 2.05. After calculation, quicklime containing 90% by weight of calcium oxide is added at 380 kg per ton of blast furnace slag; the composition of the slag phase falls within the range of CaO-SiO 2 -Al 2 o 3 - the calcium orthosilicate phase region of the MgO phase diag...

Embodiment 3

[0027] A method for processing blast furnace slag, the steps of which are:

[0028] 1) The chemical composition and weight percentage are: SiO 2 : 36%, CaO: 41%, Al 2 o 3 : 12%, MgO: 9%, S: 0.9%, FeO: 0.4%, the rest are other trace elements and impurities, and the blast furnace slag melt whose temperature is 1485°C is mixed with quicklime containing 99% by weight of calcium oxide Put it into a storage tank with a heat exchanger and mix it; the temperature in the storage tank is kept at 1285~1295 °C; and the basicity R of the mixed material is controlled at 2.1, and the weight percentage of magnesium oxide is 9.2%; according to the mixed The basicity R of the material is required to be 2.1. After calculation, quicklime containing 99% by weight of calcium oxide is added at 350 kg per ton of blast furnace slag; the composition of the slag phase falls between CaO-SiO 2 -Al 2 o 3 - the calcium orthosilicate phase region of the MgO phase diagram;

[0029] 2) Carry out stewing ...

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Abstract

The invention relates to a method for treating blast furnace slag in a steel and iron plant. The method comprises the following steps of: mixing blast furnace slag melt and calcined lime in a storage tank provided with a heat exchanger; keeping the temperature in the storage tank between 1,200 and 1,295 DEG C; keeping the alkalinity R of the mixed materials between 2.0 and 2.1; performing sealing treatment on the storage tank till the mixed materials are completely pulverized; reclaiming waste heat in the storage tank through the heat exchanger; and taking out the pulverized materials from which the heat is reclaimed. Because water quenching treatment is not needed in the method, the water slag drying cost of a cement plant is saved, the problem of equipment abrasion during flushing the slag with water is avoided, and the operating environment and the quality of air are affected little; because large blast furnace slag granulating equipment is not needed, the energy consumption is low, the process is simple, and performance and additional value of the blast furnace slag are not affected; and the method is energy-saving and environment-friendly, is favorable for improving the comprehensive utilization level of resources, and has good economic and social benefits.

Description

technical field [0001] The invention relates to a method for treating blast furnace slag in iron and steel works. Specifically, it belongs to adding quicklime to high-temperature slag and utilizing 2CaO·SiO generated at high temperature 2 During the cooling process of the slag, crystal transformation and volume expansion occur, and the blast furnace slag is naturally pulverized to obtain granular blast furnace slag for cement production. Background technique [0002] Blast furnace slag is the main by-product in the iron and steel smelting process. About 300-350 kg of blast furnace slag is produced for every 1 ton of pig iron smelted. According to the calculation of my country's annual pig iron production of 563.16 million tons, the slag production amounted to 197.1 million tons. The slag discharge temperature of blast furnace slag is about 1450°C, and each ton of slag contains heat equivalent to 60kg of standard coal. Therefore, doing a good job in the treatment of blast f...

Claims

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Application Information

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IPC IPC(8): C21B3/06C04B5/06
CPCY02P10/20Y02W30/50
Inventor 李菊艳唐恩周强刘谭璟张庆喜
Owner WISDRI ENG & RES INC LTD
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