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Modification technology of iron reduction and component reconstruction for molten slag

A steel slag and modification technology, applied in the manufacture of converters, furnace types, furnaces, etc., can solve the problems of ineffective utilization of steel slag thermal energy, restrict the utilization of steel slag, waste water resources, etc., to improve production profits, solve utilization problems, and save energy. energy effect

Inactive Publication Date: 2012-11-28
SHANGHAI MCC ENVIRONMENTAL ENG TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

f. CaO (free calcium oxide) is an important factor affecting the stability of steel slag, which seriously restricts the utilization of steel slag; due to the incomplete separation of slag and iron during smelting, slag-wrapped iron and iron-wrapped slag often appear in solid steel slag particles. Unless it is ground into powder, it is difficult to efficiently select iron from the steel slag particles through the magnetic separation process; at the same time, these steel slag treatment processes require a large amount of pure water to cool the molten steel slag to room temperature, which requires a lot of waste of water resources and the heat energy of the steel slag Unable to use effectively, serious waste of energy

Method used

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  • Modification technology of iron reduction and component reconstruction for molten slag

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Embodiment 1

[0023] Coke chips after drying, yellow sand (particle diameter all≤3mm) are dropped into molten steel slag in proportion, and the specific ratio of described molten steel slag, coke chips and yellow sand is:

[0024] Molten steel slag: coke chips: yellow sand=1:0.12:0.12;

[0025] Then raise the temperature of the steel slag to 1500°C, after it fully reacts (the boiling on the top surface of the slag tends to be calm, without up and down tumbling), and after natural cooling, analyze its chemical composition. The analysis results are shown in Table 1: the analysis method used is "YB / T 140-2009 Analysis Method for Steel Slag for Cement".

Embodiment 2

[0027] Coke chips after drying, yellow sand (particle diameter all≤3mm) are dropped into molten steel slag in proportion, and the specific ratio of described molten steel slag, coke chips and yellow sand is:

[0028] Molten steel slag: coke chips: yellow sand = 1: 0.10: 0.11;

[0029] Then raise the temperature of the steel slag to 1500°C, after it fully reacts (the boiling on the top surface of the slag tends to be calm, without up and down turbulence), and after natural cooling, analyze its chemical composition. The analysis results are shown in Table 1: the analysis method used is "YB / T 140-2009 Analysis Method for Steel Slag for Cement".

Embodiment 3

[0031] Coke chips after drying, yellow sand (particle diameter all≤3mm) are dropped into molten steel slag in proportion, and the specific ratio of described molten steel slag, coke chips and yellow sand is:

[0032] Molten steel slag: coke chips: yellow sand = 1: 0.08: 0.10;

[0033] Then raise the temperature of the steel slag to 1500°C, after it fully reacts (the boiling on the top surface of the slag tends to be calm, without up and down turbulence), and after natural cooling, analyze its chemical composition. The analysis results are shown in Table 1: the analysis method used is "YB / T 140-2009 Analysis Method for Steel Slag for Cement".

[0034] Table 1

[0035]

[0036] It can be seen from Table 1 that the steel slag raw material contains 22.84% iron, and after adding different proportions of coke and yellow sand, the iron content is significantly reduced to about 2%-3%. f. CaO content has been reduced from 9.70% to 0%.

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Abstract

The invention relates to the field of metallurgy waste residue treatment, particularly relates to a modification technology of iron reduction and component reconstruction for molten slag, comprising the following steps: adding a modified material in molten slag, wherein the modified material comprises coke and SiO2, the weight ratio of coke to SiO2 to the molten slag is 0.08-0.12:0.10-0.12:1; heating up the molten slag after mixing to 1500-1700 DEG C; after fully reaction of the modified material and the molten slag, separating molten iron from the molten slag, and then discharging the molten iron. The technology has simple process, is a short flow technology of modification and regeneration of resources, has no need for new devices, can be used directly in on line production, is a supplement for existing steel smelting technology, and only needs auxiliary production technologies.

Description

technical field [0001] The invention relates to the field of metallurgical slag treatment, in particular to a modification process for molten steel slag iron reduction and component reconstruction. Background technique [0002] Steel slag is a kind of industrial solid waste, which is the waste slag discharged during the steelmaking process. According to the furnace type, it can be divided into converter slag, open hearth furnace slag, and electric furnace slag. The discharge amount is about 15-20% of the crude steel output. Scientists around the world have begun to study the recycling of steel slag as early as the early 20th century, but due to its large fluctuations in composition, it has not been practically applied for a long time. In the early 1970s, the United States took the lead in utilizing all the 17 million tons of steel slag discharged every year. In the Federal Republic of Germany, the vast majority of steel slag has been used so far. The utilization rate of s...

Claims

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Application Information

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IPC IPC(8): C21B3/06C21C5/36C21C5/54
CPCY02W30/50
Inventor 金强王幼琴汪海龙杨刚
Owner SHANGHAI MCC ENVIRONMENTAL ENG TECH CO LTD
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