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Method for preparing high phosphorus pig iron

A high-phosphorus pig iron and pig iron technology, applied in the metallurgical field, can solve the problems of difficult to guarantee cost, serious environmental pollution, low activity, etc., and achieve the effects of reducing steel slag pollution and waste discharge, reducing environmental pollution and improving operating environment.

Inactive Publication Date: 2018-05-29
ANSTEEL GRP MINING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most enterprises treat their slag dumps, and perform magnetic separation on part of the slag after natural cooling and pulverization, and select a small proportion of metallic iron from it. useful resources
[0004] Limited by the cyclic accumulation effect of phosphorus, researchers at home and abroad have tried to remove phosphorus from converter slag. The disadvantage is that phosphorus exists stably in steel slag, and P in slag 2 o 5 The activity is low, and the removal of phosphorus must rely on high temperature to achieve the separation of slag and iron, which is difficult to guarantee in terms of cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Using molten pig iron as raw material, pour the converter dephosphorization slag into the pig iron water, then add coke powder and quartz sand, the mass ratio of converter dephosphorization slag to pig iron water is 0.5, and the mass ratio of coke powder to converter dephosphorization slag is 0.5, the addition of quartz sand is controlled to 1.0 according to the basicity of slag;

[0023] Blow oxygen to raise the temperature of the above materials, the reaction temperature is 1550°C, and the reaction time is 20 minutes. After the reaction is completed, the obtained slag is removed to obtain intermediate pig iron;

[0024] Using intermediate pig iron water as raw material, repeat the above steps once to obtain high phosphorus pig iron.

Embodiment 2

[0026] Using molten pig iron as raw material, pour the converter dephosphorization slag into the pig iron water, then add coke powder and quartz sand, the mass ratio of converter dephosphorization slag to pig iron water is 0.6, and the mass ratio of coke powder to converter dephosphorization slag is 0.4, the addition of quartz sand is controlled to 1.1 according to the basicity of slag;

[0027] Blow oxygen to raise the temperature of the above materials, the reaction temperature is 1540°C, and the reaction time is 25 minutes. After the reaction is completed, the obtained slag is removed to obtain intermediate pig iron;

[0028] Using intermediate pig iron water as raw material, repeat the above steps twice to obtain high phosphorus pig iron.

Embodiment 3

[0030] Using molten pig iron as raw material, pour the converter dephosphorization slag into the pig iron water, then add coke powder and quartz sand, the mass ratio of converter dephosphorization slag to pig iron water is 0.7, and the mass ratio of coke powder to converter dephosphorization slag is 0.3, the addition of quartz sand is controlled to 1.2 according to the basicity of slag;

[0031] Blow oxygen to raise the temperature of the above materials, the reaction temperature is 1530°C, and the reaction time is 30 minutes. After the reaction is completed, the obtained slag is removed to obtain intermediate pig iron;

[0032] Using intermediate pig iron water as raw material, repeat the above steps twice to obtain high phosphorus pig iron.

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Abstract

A method for preparing high phosphorus pig iron is conducted according to the following steps that (1) molten liquid pig iron serves as a raw material, converter dephosphorization slag is poured intothe liquid pig iron, and then powdered coke and quartz sand are added; (2) oxygen blowing is conducted for temperature increasing, the reaction temperature is 1530-1550 DEG C, the reaction time is 20-30 min, and intermediate liquid pig iron is obtained; and (3) the steps are repeated with the intermediate liquid pig iron as a raw material. Metallurgical steel slag resources are effectively utilized, the cost is low, and the problem, making people troubling all the time, that the converter dephosphorization slag cannot be utilized circularly in the metallurgical process is solved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, in particular to a method for preparing high-phosphorus pig iron. Background technique [0002] Steel slag is one of the main solid wastes discharged in the iron and steel metallurgical process. With the rapid development of my country's iron and steel industry, the discharge of steel slag is increasing year by year. In 2008, my country's crude steel output was 501 million tons, accounting for 37.7% of the world's total crude steel production. The discharge of steel slag is calculated according to the standard of 100kg / ton of steel. Add about 50 million tons of steel slag. If a large amount of steel slag cannot be recycled in time, the open-air stacking will not only occupy a large amount of land, but also seriously pollute the surrounding ecological environment. In addition, the large amount of heat energy carried by the steel slag and the rich valuable elements will also be lost in vain, res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B11/00C21B3/04
CPCC21B3/04C21B11/00Y02W30/50
Inventor 迟述义
Owner ANSTEEL GRP MINING CO LTD
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