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Method for preparing steel-making furnace burden from blast furnace gas dust zinc-extraction kiln slag

A blast furnace gas ash and steelmaking furnace technology, applied in the field of metallurgical solid waste resource recycling, to achieve the effects of wide selection range, environmental protection, and simplified process flow

Active Publication Date: 2020-05-08
HANDAN IRON & STEEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method for preparing steelmaking charge by using blast furnace gas ash to extract zinc kiln slag, which can realize the recycling of blast furnace gas ash to extract zinc kiln slag, and avoid the high energy consumption of the ball milling-magnetic separation process. The problem of secondary pollution is generated, the recovery efficiency is improved, and the cost of converter steelmaking is reduced at the same time

Method used

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  • Method for preparing steel-making furnace burden from blast furnace gas dust zinc-extraction kiln slag
  • Method for preparing steel-making furnace burden from blast furnace gas dust zinc-extraction kiln slag
  • Method for preparing steel-making furnace burden from blast furnace gas dust zinc-extraction kiln slag

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Experimental program
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Effect test

Embodiment 1

[0036] The method for preparing steelmaking charge by utilizing blast furnace gas ash to extract zinc kiln slag comprises the following steps:

[0037] a. The hot slag of the rotary kiln rotary kiln for zinc extraction from blast furnace gas ash falls from the kiln head, flushes the fire with water for slag flushing, granulates, and then sinks into the bottom of the slag pool; during the slag flushing process, the temperature of the water is 55°C and the water pressure is 1.5kg / cm 2 , the amount of water is 10 times the amount of slag;

[0038] b. The granulated kiln slag cooled at the bottom of the slag pool is taken out with a chain scraper conveyor, dehydrated and then dried naturally to obtain granulated rotary kiln slag; TFe: 52%; MFe: 16%; R 4 : 0.8; K: 0.19%; Na: 0.31%; Zn: 0.93%; carbon residue 3%; water content 4%;

[0039] c. Weigh the granulated rotary kiln slag, mineral powder, and desulfurized gypsum according to the mass ratio of 400:16:2, and mix them evenly ...

Embodiment 2

[0044] The method for preparing steelmaking charge by utilizing blast furnace gas ash to extract zinc kiln slag comprises the following steps:

[0045] a. The hot slag of the rotary kiln rotary kiln for zinc extraction from blast furnace gas ash falls from the kiln head, flushes the fire with water for slag flushing, granulates, and then sinks into the bottom of the slag pool; during the slag flushing process, the temperature of the water is 55°C and the water pressure is 1.5kg / cm 2 , the amount of water is 10 times the amount of slag;

[0046] b. The granulated kiln slag cooled at the bottom of the slag pool is taken out with a chain scraper conveyor, dehydrated and then dried naturally to obtain granulated rotary kiln slag; TFe: 52%; MFe: 16%; R 4 : 0.8; K: 0.19%; Na: 0.31%; Zn: 0.93%; carbon residue 3%; water content 4%;

[0047] c. Weigh the granulated rotary kiln slag, slag, and desulfurized gypsum according to the mass ratio of 450:18:6, and mix them evenly with a f...

Embodiment 3

[0052] The method for preparing steelmaking charge by utilizing blast furnace gas ash to extract zinc kiln slag comprises the following steps:

[0053] a. The hot slag of the rotary kiln rotary kiln for zinc extraction from blast furnace gas ash falls from the kiln head, flushes the fire with slag flushing water pipe, turns off the fire, granulates, and then sinks into the bottom of the slag pool; during the slag flushing process, the temperature of the water is 55°C and the water pressure is 1.2kg / cm 2 , the amount of water is 8 times the amount of slag;

[0054] b. The granulated kiln slag cooled at the bottom of the slag pool is taken out with a chain scraper conveyor, dehydrated and then dried naturally to obtain granulated rotary kiln slag; the granularity of granulated rotary kiln slag is between 2.5mm and 5mm, and the main components are TFe: 50%; MFe: 15%; R 4 : 0.9; K: 0.21%; Na: 0.35%; Zn: 0.94%; residual carbon 4%; water content 5%;

[0055] c. Weigh the granul...

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Abstract

The invention relates to a method for preparing steel-making furnace burden from blast furnace gas dust zinc-extraction kiln slag. The method comprises the following steps: a, flushing and pelletizing: flushing, flaming out and pelletizing after blast furnace gas dust zinc-extraction rotary kiln hot slag drops from a kiln head, and sinking the slag to the bottom of a slag bath; b, dehydrating anddrying in air: transferring out the pelletized kiln slag cooled on the bottom of the slag bath, and naturally drying the slag after the slag is dehydrated, thereby obtaining the pelletized rotary kilnslag; c, material dry-mixing: weighing the pelletized rotary kiln slag, mineral powder and desulfurized gypsum in a mass ratio being (400-650) to (16-26) to (2-6), and uniformly mixing; d, material wet-mixing: adding water into the uniformly mixed material of the pelletized rotary kiln slag, the mineral powder and the desulfurized gypsum to uniformly mix; and e, pressing and forming, and curing and drying in air: naturally curing after de-moulding, thereby obtaining a rotary kiln slag pressed product, namely steel-making furnace burden. The method can realize cyclic utilization of the blast furnace gas dust zinc-extraction kiln slag, avoids the problems of high energy consumption and secondary pollution of a ball-milling and magnetic-separating process, improves recovery efficiency, and also reduces converter steel-making cost.

Description

technical field [0001] The invention relates to a method for preparing steelmaking charge by using blast furnace gas ash to extract zinc kiln slag, and belongs to the technical field of metallurgical solid waste resource recycling technology. Background technique [0002] Blast furnace gas ash is the dust discharged from the ironmaking process. Usually, 10-150kg of furnace dust is produced per ton of pig iron smelting, which is a large amount. At the same time, blast furnace gas ash contains a large proportion of Fe, C and a small amount of Zn and Pb If resources such as resources cannot be effectively utilized, it will cause environmental pollution and waste of resources. In this regard, some enterprises adopt the rotary kiln volatilization and enrichment process to extract Zn, Pb and other metals in the ash for reuse, but the large amount of kiln slag produced cannot be well utilized because the zinc content of blast furnace gas ash in domestic steel enterprises is general...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B3/04C22B1/24
CPCC21B3/04C22B1/24Y02W30/50Y02P10/20
Inventor 卢建光贾国良李晓琪梁文特吴保华梁春海王利军贾振宇
Owner HANDAN IRON & STEEL GROUP
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