CN101475999A

CN101475999A - Rapid stabilizing method for thermal state massive steel slag

Info

Publication number: CN101475999A
Application number: CNA2009100767313A
Authority: CN
Inventors: 廖洪强; 冯向鹏; 唐卫军; 时朝昆; 王金花; 余广炜
Original assignee: Shougang Corp
Current assignee: Shougang Group Co Ltd; Shougang Corp
Priority date: 2009-01-16
Filing date: 2009-01-16
Publication date: 2009-07-08

Abstract

A rapid stabilization processing method for thermal state massive steel slag pertains to the field of thermal state massive steel slag processing technique. Thermal state solid steel slag enters in a rapid stabilization processing apparatus, CO2 gas and water vapor are accessed at the same time when the rapid stabilization processing apparatus rotates, CO2 has a chemical reaction with f-CaO and f-MgO in the steel slag, and then covers the material granule surface of f-CaO and f-MgO that do not react in the steel slag; through massive the interaction between massive steel slag or the interaction between steel slag and grinding media, the steel slag is granulated and simultaneously the hard shell of newly generated CaCO3 and MgCO3 are damaged, to expose the f-CaO and f-MgO that do not react in the steel slag; through continuous reaction between CO2, water vapor and f-CaO, f-MgO, the f-CaO and f-MgO in the steel slag can have total overall reaction, and ultimately realize rapid stabilization of steel slag.

Description

A kind of rapid stabilizing method for thermal state massive steel slag

Technical field

The invention belongs to hot block slag processing technology field; a kind of rapid stabilizing method for thermal state massive steel slag particularly is provided; the rapid stabilization that is applicable to free calcium oxide (magnesium oxide) in the solid steel slag of all temps that produces in the ferrous metallurgy industry steelmaking process is handled, and can realize the separation and the recovery of metal in the granulation of slag and the slag simultaneously.

Background technology

Calcium oxide and water reaction generate calcium hydroxide volumetric expansion 96%, and magnesium oxide and water reaction generate magnesium hydroxide, volumetric expansion 148%.Owing to have higher free calcium oxide (f-CaO) in the slag, when slag being used for concrete preparing, after concrete hardening, the f-CaO in the slag continues hydration reaction takes place, and causes concrete to burst apart.Simultaneously, in the slag forming process because the boiling splash of molten steel often contains steel grit in the slag, in addition during slagging with the effusive molten steel of slag, contain 5%～10% steel in the general slag.Slag and abrasive grit are bundled together and are discharged out of the furnace, and the cooling back becomes block, bring difficulty for the utilization of steel scrap magnetic separation recovery and tailings, and the treatment technology of slag is the key subjects of steel slag resource utilization always.

Existing slag treatment technology adopts Mechanical Crushing and anxious hot and cold vexed method mostly.The Mechanical Crushing consumption of power is big, the cost height, and gained slag tailings stability is relatively poor.In the hot disintegration method, the slag that can only handle high basicity and high free calcium oxide that has (as CN 1 048374A); What have will under high pressure handle, and wants elder generation thick broken (as CN86104347); The then processing cycle that has is grown (as Japan clear 57-42599).

The patent No. is the patent " the comprehensive hot disintegration method of block slag " of CN 1073210A, has described a kind of comprehensive hot disintegration method of block slag, and the surface temperature that slag enters before the hot vexed groove is 400 ℃～600 ℃, the vexed 20～30min of heat in groove; The heat shock stage dropped to 160 ℃～200 ℃ in 30～45 minutes; The boiling stage kept slag 2～3 hours in the steam more than 110 ℃, make slag cracked; Enter the water logging stage again, slag was soaked in 70～100 ℃ water 10～12 hours.

Publication number is the patent " a kind of thermal air tight treatment method of hot state steel slag " of CN 1786200A, has described a kind of thermal air tight treatment method of hot state steel slag, mainly comprises spraying, stop-spraying, clears up.After in this treatment process the slag of 300～800 ℃ of temperature being put into hot vexed pond, the water spray painting drenched 3～7 hours, when temperature is 75～85 ℃, stopped spray, again with the static cooling of slag 3.5～4.5 hours, and the acquisition product.

Granted publication number is the patent " the vexed processing equipment of a kind of molten steel slag heat " of CN 201 IO2937Y, the vexed processing equipment of a kind of molten steel slag heat has been described, comprise concrete sump and appliance cover, produce steam by atomized water spray in concrete sump and realize stabilization treatment, can handle the temperature of discharging from converter and be 1600 ℃ liquid slag slag.

Publication number is the patent " a kind of technique for heating liquid steel scoria " of CN 101220399A, described and a kind ofly directly poured liquid steel slag into technology that heat is handled in vexed jar, realized liquid steel slag to all processes that forms the slag particle is all finished in vexed jar of heat.

Above-mentioned technology is longer to the stabilization treatment cycle of slag, and can only handle the slag of high basicity and high free calcium oxide, simultaneously owing to relatively poor to the granulation effect of slag in the treating processes, is unfavorable for that the slag of subsequent handling, steel separate.

Summary of the invention

The object of the present invention is to provide a kind of rapid stabilizing method for thermal state massive steel slag; solved the problem that existing slag treatment technology exists at aspects such as the processing of slag rapid stabilization, slag granulation and the separation of slag steel; can realize that the slag rapid stabilization handles, and realize that on this basis the slag granulation separates with the slag steel.

The device that the present invention adopts hot block slag rapid stabilization to handle is handled, and hot solid slag enters slag rapid stabilization treatment unit by chute, rotates simultaneously at solid steel slag rapid stabilization treatment unit, feeds CO ₂Gas and water vapor pass through CO ₂With f-CaO, f-MgO in the slag chemical reaction taking place, generates the CaCO that is insoluble in water ₃And MgCO ₃, and cover unreacted f-CaO in the slag, f-MgO material particles surface; By the interaction between the interaction between the block slag or block slag and grinding medium, when making the slag granulation, make newly-generated CaCO ₃And MgCO ₃Duricrust destroys, and exposes unreacted f-CaO, f-MgO in the slag; Keep bringing in constant renewal in simultaneously by mechanical force unreacted f-CaO, f-MgO particle surface in making slag, pass through CO ₂, water vapor and f-CaO, f-MgO continuous reaction, make f-CaO in the slag, f-MgO be able to total overall reaction, realize that finally the rapid stabilization of slag is handled.

In the slag stabilization treatment simultaneously, because slag is carried out granulated processed, destroy CaCO that generated, that cover unreacted f-CaO, f-MgO particle surface ₃And MgCO ₃Duricrust makes f-CaO, f-MgO particle surface be able to continuous updating, thus guaranteed the slag stabilization treatment fast, continue, thoroughly carry out.

Owing to realized the granulation of slag in treating processes, the slag after rapid stabilization is handled can be directly by magnetic separation, and tailings and metal separates in the realization slag.

The device that hot block slag rapid stabilization of the present invention is handled comprises CO ₂Inlet mouth, water vapor import, solid steel slag slag inlet, rapid stabilization treatment unit, air outlet, slag notch, drive unit.

Among the present invention,, can shorten slag stabilization treatment required time along with the rising of processing solid steel slag temperature; The slag stabilization treatment is carried out granulated processed to slag simultaneously, thereby be beneficial to separating of tailings and metal in the slag.

Principal feature of the present invention is:

(1) with respect in the past water and the reaction between f-CaO, the f-MgO, the present invention passes through CO ₂, water vapor and f-CaO, f-MgO acid-base reaction, shortened slag stabilization treatment required time;

(2) in slag granulated processed process, destroy CaCO that generated, that be wrapped in unreacted f-CaO, f-MgO particle surface ₃And MgCO ₃Duricrust makes the particle surface continuous updating, thus guaranteed the slag stabilization treatment fast, continue, thoroughly carry out.

(3) can be through the slag after the stabilization treatment directly by magnetic separation, tailings and metal separates in the realization slag.

Description of drawings

As Fig. 1 is the setting drawing that a kind of hot block slag rapid stabilization involved in the present invention is handled.Wherein, CO ₂Inlet mouth 1, water vapor import 2, solid steel slag slag inlet 3, rapid stabilization treatment unit 4, air outlet 5, slag notch 6, drive unit 7.

Embodiment

The present invention relates to a kind of rapid stabilizing method for thermal state massive steel slag, implementation step is described below in conjunction with Fig. 1:

By the slag that slag ladle is discharged, the hot solid slag after preliminary cooling and granulation enters the solid steel slag rapid stabilization treatment unit 4 of rotation by slag inlet 3, simultaneously CO ₂Gas and water vapor pass through CO respectively ₂ Inlet mouth 1 and water vapor import 2 enter slag rapid stabilization treatment unit 4; the stabilization treatment device that drives by drive unit 7 is in rotary course; by the interaction between slag self or slag and the grinding medium; realizing the slag granulation simultaneously, the CaCO that generates in the stabilizing process, be wrapped in unreacted f-CaO, f-MgO particle surface ₃And MgCO ₃Duricrust destroys, and exposes unreacted f-CaO, f-MgO in the slag, passes through CO ₂, water vapor and f-CaO, f-MgO continuous reaction, make that f-CaO in the slag, f-MgO are able to all, rapid reaction, gas after the process stabilization treatment returns inlet mouth 1 recycle after being discharged by air outlet 5 again, after slag is discharged via slag notch 6, through realizing separating of slag tailings and metal after the magnetic separation.

Claims

1, a kind of rapid stabilizing method for thermal state massive steel slag, the device that adopts hot block slag rapid stabilization to handle is handled; It is characterized in that hot solid slag enters slag rapid stabilization treatment unit by chute, rotate simultaneously, feed CO at solid steel slag rapid stabilization treatment unit ₂Gas and water vapor pass through CO ₂With f-CaO, f-MgO in the slag chemical reaction taking place, generates the CaCO that is insoluble in water ₃And MgCO ₃, and cover unreacted f-CaO in the slag, f-MgO material particles surface; By the interaction between the interaction between the block slag or block slag and grinding medium, when making the slag granulation, make newly-generated CaCO ₃And MgCO ₃Duricrust destroys, and exposes unreacted f-CaO, f-MgO in the slag; Keep bringing in constant renewal in simultaneously by mechanical force unreacted f-CaO, f-MgO particle surface in making slag, pass through CO ₂, water vapor and f-CaO, f-MgO continuous reaction, make f-CaO in the slag, f-MgO be able to total overall reaction, realize that finally the rapid stabilization of slag is handled.

2, according to the described a kind of rapid stabilizing method for thermal state massive steel slag of claim 1, it is characterized in that: the device that described hot block slag rapid stabilization is handled comprises CO ₂Inlet mouth (1), water vapor import (2), solid steel slag slag inlet (3), rapid stabilization treatment unit (4), air outlet (5), slag notch (6), drive unit (7).