CN104561589A - Method for blowing matte through copper converter - Google Patents

Abstract

The invention discloses a method for blowing matte through a copper converter. The method comprises the following steps: 1) feeding materials; 2) slagging; 3) discharging slag; 4) roasting and blowing; 5) blowing in the second cycle; 6) closing slag and discharging. The method is characterized in that quartz is added to enable the SiO2 content of slag to be 18 to 21% before closing the slag and discharging. According to the method, the characteristic of high melting point of Fe3O4 is utilized, and the content of Fe3O4 is controlled to be within a proper range, so that Fe3O4 can be attached on the surface of furnace lining to protect the furnace lining under a high temperature state, and as a result, the service of the converter can be prolonged.

Description

A kind of copper bessemerizes the method for matte

Technical field

A kind of Copper making field, particularly relates to a kind of method that copper bessemerizes matte.

Background technology

The blowing refinement of the matte is the oxygen utilized in air, and the iron in matte (CuS and FeS) and sulphur are almost all oxidized removing, and other impurity of remove portion, to obtain blister copper.Bessemerize point two stages: first stage often claims slag forming period, except de-iron and sulphur; Subordinate phase is copper making period, carries out CuS oxidation, CuS and CuO reacts to each other, finally obtain blister copper.Bessemerize as periodic job, slag forming period, is the white matte (Cu obtaining sufficient amount ₂s), then the slag FeS remained in matte is removed, namely sieve stove.

Bessemerize in production process at copper, converter lining is damaged gradually under the effect of mechanical force, thermal stresses and chemical erosion.In actual production, the damage of converter lining roughly divides two stages: first stage, and when new stove blows for the first time (i.e. initial stage in furnace life), furnace lining is not too serious by the erosion action of impurity, at this moment falling block by the effect backup lining brick of thermal stresses, to fall sheet more, and tuyere brick is seriously impaired.Subordinate phase, stove work for some time (later stage in furnace life), furnace lining is comparatively large by contaminating erosion effect, goes bad in brick face.

Practice shows, the severity that furnace lining damages everywhere is different, and it is the above district in tuyere zone and air port that furnace lining damages the most serious position, is secondly near air port two headwall by the part of melt submergence, and furnace bottom and opposite, air port furnace wall damage lighter.

At copper making period, furnace lining damages more serious than slag forming period.When adopting oxygen-rich air blowing, furnace lining damages than serious during employing air.The reason that furnace lining damages is a lot, sums up to get up mainly by the result of mechanical force, thermal stresses and chemical erosion three kinds of power effects.

Summary of the invention

Copper bessemerizes a method for matte, comprises the following steps:

1) charging; 2) slag making; 3) clean slag; 4) stove blowing is hung; 5) two cycles blowing is entered; 6) close slag to come out of the stove;

It is characterized in that: close before slag is come out of the stove and add quartz.

According to aforesaid operations method, it is characterized in that: the add-on of described quartz should make SiO in slag ₂content 18% ~ 21%.

Beneficial effect of the present invention: method of the present invention utilizes Fe ₃o ₄fusing point high characteristic, controls its content in OK range, makes it adhere to furnace lining surface and plays the effect protecting furnace lining at high operating temperatures, improve the Converter life-span.

Embodiment

The present invention utilizes Fe ₃o ₄fusing point high characteristic, controls its content in OK range, makes it adhere to furnace lining surface and plays a kind of working method protecting the effect of furnace lining at high operating temperatures.

Fe3O4 furnace retaining ultimate principle chemical equation is:

1）、2FeS+3O2=2FeO+2SO ₂；

2）、2FeO+SiO ₂=2FeO·SiO ₂ ；

3）、6FeO+O ₂=2Fe ₃O ₄。

The blowing refinement of the matte is periodic job, and in slag forming period, FeS is oxidized by air blast:

2FeS+3O ₂=2FeO+2SO ₂(1)

The FeO generated is combined with quartzy flux and enters slag phase:

2FeO+SiO ₂=2FeO·SiO ₂(2)

In slag forming period, reaction (1) is carried out very rapid, and reacts (2) and carry out slower in temperature lower than when 1220 DEG C, and FeO melt and quartz (SiO ₂) solid contact is bad, causes the FeO slagging process of reaction (2) to become the weakest link.Those have little time the FeO of slag making, under blasting action, be further oxidized to martial ethiops:

6FeO+O ₂=2Fe ₃O ₄

Low white residue is in conjunction with Fe ₃o ₄furnace retaining methodology:

Charging → slag making → clean slag → extension stove blowing (generates Fe ₃o ₄→ enter two cycles blowing to close slag and come out of the stove (adding quartz).According to this flow process, cyclical operation, implements to hang stove operation.

Theory and combining is actual, through field practice, demonstration, sums up and finds out following work flow to implement low white residue in conjunction with Fe ₃o ₄hang furnace operating.

1) Fe ₃o ₄the concrete operation step of furnace retaining is as follows: add appropriate quartz when period 1 slag making terminates to come out of the stove, and concrete add-on must determine according to the working of a furnace, discard slag with copper, matte temperature situation, implements to close slag and comes out of the stove; Then enter following core, enter cycle blowing, slag making, FeS is oxidized and generates FeO, the quartz closing slag with upper stove carries out slag making reaction, generates 2FeOSiO ₂, control SiO in slag ₂content, between 18% ~ 21%, discharges slag, continues blowing, and the sieve campaign strictly controls quartzy add-on, and add-on is the target add-on after calculating, and error is no more than 1 ton.Opportunity of getting hold of clean slag, add refer to opportunity for made first pass slag and after drained slag for important opportunity, made second time slag to sieve stokehold slagging terminate after be crucial opportunity, remainder FeS is oxidized and generates FeO, further peroxidation generates Fe ₃o ₄protective layer covers refractory surface and forms protective layer, carries out extension furnace operating.

After hanging furnace accretion bundle, enter two cycles blowing, implement to close slag after blowing into qualified blister copper and come out of the stove.

According to above-mentioned flow process, sum up and after a upper stove reaches blow end point, to add quartz close slag and come out of the stove.Next stove one cycle implements the operation of low white residue, and the scope of low white residue is interval 18 to 21%, implements the quartzy add-on controlled when stove hung by Z 250.Strict control add-on implements Fe ₃o ₄hang stove, strict control blister copper blow end point FOUR EASY STEPS method.

Fe ₃o ₄the concrete operations flow process of furnace retaining is as follows:

Charging → slag making → clean slag → extension stove blowing (generates Fe ₃o ₄);

Enter the two cycles slag that blows → close to come out of the stove (adding quartz);

According to above-mentioned flow process, cyclical operation, implements to hang stove operation.

effect:

Within 2009, begin to take shape a set of fixing operation method, the Converter life-span in 2010 increases substantially, for 2#, 5# converter, 86t converter is when process electric furnace output grade is the matte of 30 ~ 35%, about furnace li` brings up to 800 heats of 2010 by 300 original heats, 110t converter when to process synthetic furnace output grade be the matte of more than 55%, about furnace li` rises to 1100 heats of 2010 by 450 original heats.

table one: furnace li` in the 2# converter time between overhaul

table two: furnace li` in the 5# converter time between overhaul

Claims (2)

1. copper bessemerizes a method for matte, comprises the following steps:

1) charging; 2) slag making; 3) clean slag; 4) stove blowing is hung; 5) two cycles blowing is entered; 6) close slag to come out of the stove;

It is characterized in that: close before slag is come out of the stove and add quartz.

2. a working method as described in the appended claim 1, is characterized in that: the add-on of described quartz should make SiO in slag ₂content 18% ~ 21%.