Some simple introductions to the problem of determination of carbon and sulfur additives by combustion method - Database & Sql Blog Articles

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Multi-element analyzer

Multi-element analyzer is an important instrument for determining the chemical composition of metal materials such as steel and iron. It is widely used in industrial and mining enterprises such as metallurgy, minerals, machinery, foundry, chemical industry, scientific research institutes and technical quality supervision departments. Generally divided into computer multi-element analyzer, microcomputer high-speed analyzer, metal multi-element analyzer, carbon sulfur analyzer, infrared carbon sulfur analyzer, ore element analyzer, etc., carbon sulfur analyzer is widely used, the following introduction The combustion method is used to determine the problem of additives for carbon and sulfur.

Types of commonly used additives

Combustion method for the determination of carbon and sulfur, commonly used additives are

Sn

,

Cu

,

Fe

,

CuO

,

V2O5

,

Cr2O3

,

SiO2

,

SnO2

,

Si

,

W

,

Mo

,

MoO3

,

WO3

,

B2O3

Wait. There are also differences in the application of additives to different combustion systems. For example, high-frequency furnaces usually use tungsten particles, electric arc furnaces usually use iron powder and silicon molybdenum powder, while tube furnaces use tin particles.

V2O5

Wait. Different test samples, sometimes use some special additives or composite additives, electric arc furnace combustion selection

TH-100

additive. High-frequency furnace combustion uses tungsten particles containing tin, which are all composite additives. Since the composition of the additive is different and the properties are different, the effect is different in the combustion process.

The role of additives

Flux: the melting point of iron is about

1529

,in

1500K

It is difficult to melt at the temperature. Although the iron contains other elements, the freezing point is lowered, but the iron cannot be melted into a liquid.

CO2

with

SO2

It cannot escape in the solid phase and can only be released in the liquid phase. Therefore, it is necessary to add a flux to lower the melting point. Due to the importance of this point, additives have often been referred to as fluxes in the past.

Heating effect: Some of the additives used are metal and non-metal elements, which are oxidized and burned in the oxygen stream, which can release a large amount of heat, which can improve the furnace temperature, especially for the electric arc furnace combustion.

Adjusting the acidity and alkalinity of the medium: oxidative combustion

CO2

with

SO2

, all belong to acidic oxides, alkaline medium is not conducive to

CO2

with

SO2

The release, the selection of the right amount of acidic additives added to the combustion system, can make the medium become neutral or weakly acidic, which is beneficial to

CO2

with

SO2

Escaped. especially

SO2

More sensitive to acidity and alkalinity of the medium. Therefore, care should be taken to adjust the pH of the medium.

Stirring: Stirring can accelerate the diffusion of sulfur ions, facilitate contact with oxygen, accelerate the oxidation reaction, and additives (such as

SiO2

Because the liquid density is lower than that of iron oxide, the diffusion of sulfur ions can be accelerated in the process of floating upwards inside the system. Some additives generate gas substances after being heated, and can play a good stirring effect when the gas escapes.

Catalysis: such as copper oxide, carbon and sulfur can be captured during combustion

CuO

Oxygen generation

CO2

with

SO2

, then oxygen and copper generation

CuO

, catalytic acceleration.

Stable combustion: The burning of the electric arc furnace is sometimes unstable. If an appropriate amount of tin or silica is added to the electric arc furnace combustion, it will help to stabilize the combustion.

Anti-interference effect: generated after combustion

FeO3

,

SnO2

Waiting for dust, right

SO2

Adsorption, resulting in low test results, adding relevant additives to prevent adsorption and reduce dryness

Disturb.

Participate in chemical reactions: Additives participate in chemical reactions.

There are many kinds of multi-element analyzers, which play an important role in industrial and mining enterprises such as metallurgy, minerals, machinery, foundry, chemical industry, scientific research institutes and technical quality supervision departments. The application of carbon and sulfur analyzers in multi-element analyzers is more extensive. There are many aspects in use that require our attention. Some simple introductions to the problem of determining carbon and sulfur additives by the above combustion method are expected to be beneficial to everyone.