Method to determine chemical composition of slag materials

FIELD: metallurgy.

SUBSTANCE: invention relates to ferrous metallurgy and can be used to determine chemical composition of materials containing lump metal and used as raw material in cast iron production. The method involves separation of material into metal and slag fractions, measurement of metal fraction weight, grinding of slag fraction down to the fineness of 5 mm at most and determination of weight ratio of total ferrum and of necessary components in it by complete acid digestion, calculation of weight ratio of total ferrum and of components in the material, after grinding a sample is taken with the fineness of from 0.16 mm to 5 mm at most and chemical analysis is performed.

EFFECT: improved information value and reliability of analysis.

 

The invention relates to metallurgy, and in particular to determine the chemical composition of the slag materials. The technical result of the invention is the possibility to obtain the chemical composition of the slag material containing a lump of metal, and on the basis of the received data to accurately calculate the flow of charge materials for iron smelting.

This is ensured by the separation of material on the metal and slag components, measuring the mass of a metal component, the grinding of the slag component to a particle size of 5 mm and defining, through full acid digestion, mass fraction of total iron and the necessary components, the calculation of the mass fraction of total iron and components in the material.

The slag material containing lumps of metal are used as the iron containing additive in the production of cast iron. For averaging the composition of the sample before chemical analysis is chopping. However, to grind material containing large inclusions of metallic iron, to a grain size of less than 0.16 mm, it is impossible.

There is a method of sample preparation GOST 15054-80 "iron Ore, concentrates, agglomerates and pellets. Sampling methods and sample preparation for chemical analysis and determination of moisture content". This standard establishes a method of sample preparation for chemical analysis of the multiple stages of crushing, mixing, reduction, screening, grinding to a grain size of less than 0.16 mm and, respectively, the chemical analysis of the material with grain size less than 0,16 mm This standard does not describe how to deal with the remnants of the sample having a grain size of more than 0.16 mm after repeated grinding.

Closest to the claimed method is a method of preparation of metallurgical slag samples for chemical analysis, which includes several sequentially performed steps of grinding, mixing and splitting up to a certain weight. Before the first, second, third and fourth stages manually select metal inclusions. On the fourth, sixth and seventh stages of the selection of metallic impurities is carried out by screening on the screens between screening (see RF patent 2263151).

This method does not allow to obtain the chemical composition of the original sample, as selected metal inclusions do not participate in chemical analysis and not included in the final chemical composition of the sample.

The aim of the invention is the determination of the mass fraction of components in the slag material containing lumps of metal required for the calculation of the charge in the production of cast iron, the development of new technologies, conducting scientific research.

This goal is istihaada when using the method, involving separation of the sample on the metal and slag components by selecting manually a large metal pieces (scrap), sample reduction, shredding in several stages depending on the size of the sample, screening and selection manually metal particle size greater than 5 mm, grinding the remaining portion size more than 5 mm, the separation from her by screening of metal particle size greater than 5 mm, screening class a particle size less than 5 mm after each grinding and separation of the two particles is less than 0.16 mm and 0.16 mm to 5 mm, determination of the mass fraction of components in classes of size less than 0.16 mm and 0.16 mm to 5 mm by complete acid digestion of the sample, the calculation of the mass fraction of total iron and components in the original sample.

The method of determining the chemical composition of the slag material containing a lump of metal, includes 3 stages.

1. Determining the amount of metallic impurities

2. Determination of mass fraction of total iron and components

2.1 Determination of mass fraction of total iron and components in the material of size less than 0.16 mm

2.1.1 Determination of mass fraction of total iron is based on the reduction of iron (III) solution douglasthe tin in slabosolenaja environment to iron (II) is the titration of the final solution dvuhromovokislyj potassium in the presence of the indicator diphenylimidazole sodium.

2.1.2 Determination of the remaining components is performed according to the existing methods of quantitative chemical analysis.

2.2 Determination of mass fraction of total iron and components in material size from 0.16 mm to 5 mm

2.2.1. Part of the sample, prepared by p. 1.17, dissolve by heating in hydrochloric acid, if you do not want the definition of SiO2added ammonium fluoride for better digestion of the sample. After reducing the volume of the solution is cooled, transferred to a volumetric flask by decantation, avoiding getting stuck in the flask, aristorenas part of the sample. Washed pretorious part of the sample with water, collecting the washing water in the flask. The processes of dilution and decantation is carried out before until all the sample has dissolved. The solution is brought up to the mark and mix.

2.2.2 From the resulting solution is determined by the total iron. To do this, select the aliquot part of the solution and placed in a flask. Analysis method based on the reduction of iron (III) solution douglasthe tin to iron (II) and the titration of the final solution dvuhromovokislyj potassium in the presence of the indicator diphenylimidazole sodium.

2.2.3. From the solution obtained in paragraph 2.2.1, it is possible to identify other components.

3 calculation of the mass fraction of total iron and components in the slag material containing lumpy metal

3.1 Calculation of massovogo total iron

3.1.1 Mass fraction of total iron (Fetotal,%) is calculated by the formula:

where mFeRCDsthe amount of iron in the scrap, g;

mFecorthe amount of iron in the "Regulus", g;

mFe<0,16the amount of iron in the material of size less than 0.16 mm, g;

mFe0,16-5the amount of iron in the material size from 0.16 mm to 5 mm, g;

mCRthe sample mass, g

3.1.2 Amount of iron in the scrap (mFeRCDs, g) is calculated by the formula:

mFeRCDs=0,9·mRCDs,

where 0,9 - correction factor taking into account the slagging scrap;

mRCDs.- weight of scrap, ,

3.1.3 the Amount of iron in the "Regulus" (mFecor, g) is calculated by the formula:

where 0,9 - correction factor taking into account the slagging "Wren" metal;

mcor(UAI)- mass "Wren" of metal in the sample, g;

mOSTis the mass of the remaining material after separation of the scrap, g;

mUAI- the mass of a sample obtained after reduction of the remaining material (scrap), ,

3.1.4 the Amount of iron in the material particles less than 0.16 mm (mFe<0,16, g) is calculated by the formula:

mFe<0,16=k1·m<0,16

where k1- coefficient taking into account the content of iron in the material coarsely the ti less than 0.16 mm;

m<0,16- the mass of material of size less than 0.16 mm in the sample, ,

K1taking into account the content of iron in the material of size less than 0.16 mm, is determined by the formula:

where FeGeneral<0,16- mass fraction of total iron in the material of size less than 0.16 mm, obtained by chemical means, %.

The mass of material of size less than 0.16 mm in the original sample (m<0,16, g) is determined by the formula:

3.1.5 the Amount of iron in the material fractions from 0.16 mm to 5 mm (mFe 0,16-5, g) is calculated by the formula:

mFe 0,16-5=k2·(mCR-mFe TFR-mFe cor-m<0,16),

where k2- coefficient taking into account the content of iron in the material size from 0.16 mm to 5 mm

K2taking into account the content of iron in the material of size less than 0.16 mm, is determined by the formula:

where FeGeneral 0,16-5- mass fraction of total iron in the material size from 0.16 mm to 5 mm, obtained by chemical means, %.

3.2 Calculation of the mass fraction of components in the original sample

Mass fraction of components (X, %) is calculated by the formula:

where X'0,16-5- mass fraction of the component in the material size from 0.16 mm to 5 mm, obtained by chemical means, %,

where X'<0,16mA is Sova proportion of the component in the material of size less than 0.16 mm, obtained by chemical means, %.

The proposed method is publicly available, does not require complex and expensive laboratory equipment.

Distinctive features of the proposed method are:

- grinding samples for chemical analysis particle size up to 5 mm;

- decomposition of the sample material, uniform in grain composition, grain size from 0.16 mm to 5 mm;

- determination of the mass fraction of total iron and components in the material, taking into account neizlechimoj fraction more than 5 mm.

Sources of information

1. GOST 15054-80 "iron Ore concentrates. Agglomerates and pellets. Sampling methods and sample preparation for chemical analysis and determination of moisture content".

2. Patent 2263151. The method of preparation of metallurgical slag samples for chemical analysis. Publ. 27.10.2005 St,

The method of determining the chemical composition of the slag material containing a lump of metal, including the separation of material on the metal and slag components, measurement of the mass of a metal component, the grinding of the slag component to a particle size of not more than 5 mm and defining it through a full acid digestion mass fraction of total iron and the necessary components, the calculation of the mass fraction of total iron and components in the material, wherein after grinding away the sample size from 0.16 mm, is about less than 5 mm, and perform chemical analysis.



 

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