CN103740942A - Metal smelting slag separating and recycling production process - Google Patents

Abstract

The invention provides a metal smelting slag separating and recycling production process. The process comprises the following steps: separating slag of which the particle size is larger than a screen hole and block slag of which the particle size is smaller than the screen hole through natural pulverization, separating the pulverized large metal particles through a primary separator, conveying the metal particles to a smelting plant for recycling, separating small metal particles through centrifugal force according to a secondary separator, and conveying the small metal particles to the smelting plant for recycling; separating the particles through a bag type dust collector, taking the residual powdery slag into the bag type dust collector, allowing slag-containing gas to pass through the bag type dust collector so as to obtain clean gas, discharging the clean gas into air through a fan via a chimney, feeding the residual powdery slag of the bag type dust collector and the block slag screened by a bulk pit into a ball mill for grinding, and finally, conveying the final obtained slag into a cement plant for recycling. The potential safety hazard of explosion caused by non-uniformity coldness and heat in the process of washing the slag in a traditional process is avoided, and the process has the characteristics of small site area, low water consumption, low recycling energy consumption, safety and reliability.

Description

A kind of Metal smelting slag separates recycling production technique

Technical field

The present invention relates to a kind of Metal smelting slag and separate recycling technique.

Background technology

In Metal smelting process, insufficient owing to smelting, part metals is discharged smelting furnace with slag, causes the significant wastage of resource.Therefore, in modern Metal smelting process, all can add slag separating technology, improve efficiency.

It is appropriate water to be sprayed to high temperature furnace slag short it is cooling that traditional Metal smelting slag separates recycling production technique, isolates metal and slag, slag through drying, screening, recycle after drying, grinding, metal straight takes back receives that smeltery utilizes.This method has following shortcoming:

land area is large, and slag can not effectively separate, and takies a large amount of soils.

water loss is large, and the slag temperature just having dispatched from the factory is high, more than 700 ℃, make cooling of furnace slag, need to expend a large amount of water.

recovery energy consumption is high, needs to dry through special drying plant after recovery, has greatly increased the energy consumption of recycling, and can discharge the gases such as great amount of carbon dioxide, sulfurous gas in drying course simultaneously.

poor stability, high temperature easily causes equipment distortion, and slag to have metal content high, the characteristic of expanding with heat and contract with cold is very obvious; Adopt the mode of chilling easily to cause that slag surface condensation shrinks, and that fail slag inside is by the time cooling, outside interior heat, under cold state, very easily sets off an explosion.

Therefore, invent that a kind of land area is little, water loss is little, reclaiming low, the safe and reliable Metal smelting slag of energy consumption, to separate recycling production technique extremely urgent.

Summary of the invention

The object of the invention is to defect and deficiency for prior art, provide the Metal smelting slag that a kind of land area is little, water loss is little, recovery energy consumption is low, safe and reliable to separate recycling production technique.

For achieving the above object, Metal smelting slag separation recycling production craft step of the present invention comprises:

(1) natural degradation: the high temperature furnace slag of recovery is positioned over to the web plate on looseization hole, web plate contains equally distributed web plate hole, to be cooled to slag looseization, efflorescence naturally after 400～500 ℃, the slag that particle diameter is less than web plate hole falls to bottom, looseization hole by web plate hole, then by the handling equipment of bottom, be transported to initial separator, the block slag that particle diameter is greater than web plate hole proceeds in step (5).

(2) primary separation: initial separator by the macrobead metal separation of efflorescence out, is transported to smeltery's recycling.

(3) secondary separation: secondary separators by centrifugal force by small-particle metal separation out, is transported to smeltery's recycling.

(4) bag filter separates: remaining powdery slag is along with wind is brought in bag filter, by bag filter, reclaim, gas containing slag draws clean gas after bag filter, clean gas is discharged in air through chimney after blower fan, and bag filter is collected remaining powdery slag.

(5) slag grind: the powdery slag that step (4) is obtained with in by step (1) looseization cheat sift out block slag together with send into ball mill grinding, the slag after grinding is transported to cement mill and recycles processing.

Compared with prior art, outstanding advantages of the present invention is:

1, solved potential safety hazard uneven in temperature when traditional technology slag is washed and that generation is exploded.

2, the processing mode of the water-cooled of the present invention and traditional technology is different, and this new technique is by slag naturally cooling, separation, has greatly improved that metal is separation with slag, the efficiency of recovery.

3, novel process draws metal and pulverized slag water content are low, saved water consumption, and after reclaiming, without drying through special drying plant, greatly reduce the energy consumption of recycling, reduce the gas purgings such as carbonic acid gas in drying course, sulfurous gas.

Accompanying drawing explanation

Fig. 1 is that conventional metals smelted furnace cinder separates recycling production technological process.

Fig. 2 is process flow sheet of the present invention.

Embodiment

Below in conjunction with drawings and Examples, technical scheme of the present invention is further elaborated:

As Fig. 1, it is as follows that conventional metals smelted furnace cinder separates recycling production craft step:

(1) washing: high temperature furnace slag is transported to and processes field, appropriate water is sprayed to high temperature furnace slag.

(2) screening: the high temperature furnace slag after cooling, efflorescence is sieved, obtain metal and slag.

(3) metal recycling: the metal obtaining after screening is transported to smeltery's recycling.

(4) slag is dried: the slag obtaining after screening is transported to drying machine drying.

(5) slag grinds: the slag of drying is put into ball mill, draw the slag of needed specific size particles.

(6) slag recycling: the slag of specific size particles is transported to cement mill recycling.

As Fig. 2, processing step of the present invention is as follows:

(1) natural degradation: the high temperature furnace slag of recovery is first passed through to efflorescence processing.Because the temperature of slag is higher, design several looseization holes for this reason, on hole, there is web plate, web plate contains equally distributed web plate hole.Slag is positioned over to the web plate on looseization hole, until cooling of furnace slag after certain temperature, looseization, efflorescence naturally, the slag that particle diameter is less than web plate hole falls to bottom looseization cheat by web plate hole, then by the handling equipment of bottom, is transported to initial separator; The block slag that particle diameter is greater than web plate hole proceeds to step in.

(2) primary separation: initial separator by the macrobead metal separation of efflorescence out, is transported to smeltery's recycling.

(3) secondary separation: secondary separators by centrifugal force by small-particle metal separation out, is transported to smeltery's recycling.

(4) bag filter separates: remaining powdery slag can be brought in bag filter along with wind, by bag filter, reclaims.Gas containing slag draws clean gas after bag filter, and clean gas is discharged in air through chimney after blower fan, and bag filter is left powdery slag.

(5) slag grinds.The powdery slag that step (4) is obtained is sent into ball mill grinding together with sifting out next block slag with looseization hole in by step (1).Because the slag containing metal composition grinding out is lower, should not refine again, but with respect to slag cement, refractory brick, phosphate fertilizer, magneticsubstance etc., just right can the recycling of metallic element composition that it contains, therefore can be transported to this slag cement mill etc. and recycle.

Application Example:

High temperature furnace slag is placed in the web plate on looseization hole, and web plate contains the web plate hole that equally distributed particle diameter is 100mm.Until cooling of furnace slag, after certain temperature, slag is looseization, efflorescence naturally, and the slag that particle diameter is less than web plate hole falls to bottom, looseization hole by mesh, by the handling equipment of bottom, is transported to initial separator; Particle diameter is greater than the slag in web plate hole, proceeds in subsequent disposal.

Slag is transported to initial separator, and initial separator, by being less than metal separation that 100mm is greater than again 8mm out, is transported to smeltery's recycling, can effectively reduce the working load of secondary separators.

Slag is transported to secondary separators, and secondary separators will be less than 8 millimeters of metal separation that are greater than again 40 micron particle out by centrifugal force, is transported to smeltery's recycling.

The remaining slag that is less than 40 micron particle can be inhaled in bag filter along with wind, by bag filter, collects, and the clean gas drawing after bag filter containing the gas of slag, clean gas is discharged in air through chimney after blower fan; Remaining powdery slag is transported to ball mill grinding together with sifting out next block slag with looseization hole.Because the slag containing metal composition grinding out is lower, should not refine again, but with respect to slag cement, refractory brick, phosphate fertilizer, magneticsubstance etc., just right can the recycling of metallic element composition that it contains, therefore can be transported to cement mill by this slag and recycle.

Claims (1)

1. Metal smelting slag separates a recycling production technique, it is characterized in that comprising the following steps:

(1) natural degradation: the high temperature furnace slag of recovery is positioned over to the web plate on looseization hole, web plate contains equally distributed web plate hole, to be cooled to slag looseization, efflorescence naturally after 400～500 ℃ of temperature, the slag that particle diameter is less than web plate hole falls to bottom, looseization hole by web plate hole, then by the handling equipment of bottom, be transported to initial separator, the block slag that particle diameter is greater than web plate hole proceeds in step (5);

(2) primary separation: initial separator by the macrobead metal separation of efflorescence out, is transported to smeltery's recycling;

(3) secondary separation: secondary separators by centrifugal force by small-particle metal separation out, is transported to smeltery's recycling;

(4) bag filter separates: remaining powdery slag is along with wind is brought in bag filter, by bag filter, reclaim, gas containing slag draws clean gas after bag filter, clean gas is discharged in air through chimney after blower fan, and bag filter is collected remaining powdery slag;

(5) slag grind: the powdery slag that step (4) is obtained with in by step (1) looseization cheat sift out block slag together with send into ball mill grinding, the slag after grinding is transported to cement mill and recycles processing.

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