CN112629962A - Method for separating carbon-containing components from blast furnace fly ash - Google Patents
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Abstract
The invention discloses a method for separating carbon-containing components from blast furnace fly ash, which mainly solves the technical problem that unburned coal powder and coke powder in the existing blast furnace fly ash cannot be accurately separated. The invention relates to a method for separating carbon-containing components from blast furnace dust, which comprises the following steps: 500mL of zinc chloride solution with the mass volume concentration of 1.7-1.8g/mL is prepared; separating unburned coal powder in blast furnace dust; drying the unburned coal powder; separating unburned coke powder in blast furnace dust; drying the unburned coke powder; and calculating the content of the carbon-containing components in the blast furnace dust. The method realizes the separation of unburned coal powder and unburned coke powder of carbon-containing components in the ironmaking blast furnace ash, and the physical and chemical properties of the components are not influenced in the separation process; the method has the advantages of simple process, simple and convenient operation, low cost and good separation effect.
Description
Technical Field
The invention relates to a method for separating components in blast furnace fly ash, in particular to a method for separating carbon-containing components in blast furnace fly ash, and specifically relates to a method for separating unburned coal powder and coke powder from iron-making blast furnace fly ash, belonging to the technical field of blast furnace iron-making process and blast furnace fly ash treatment.
Background
The dust removed from the iron-smelting blast furnace is one of the main solid emissions in the steel industry. The blast furnace dust mainly comprises three parts of coke powder, coal powder and mineral powder. The carbon-containing substances in the blast furnace dust are mainly from coke used for iron making and unburned coal powder for injection, the research on the sources of the carbon-containing substances can provide technical parameters for reducing the carbon-containing substances in the blast furnace dust, and the method has high theoretical research and production guidance values on the production, high yield, sequential production and economic operation of the blast furnace.
The Chinese patent application publication No. CN103278505A discloses a blast furnace fly ash component analysis method based on multi-feature analysis, which adopts a digital camera to collect images and then utilizes a computer image processing system to analyze the components of the blast furnace fly ash. The images are processed by the computer system to obtain blast furnace dust component classification, and the separation and subsequent utilization of each component of the blast furnace dust are guaranteed. The main problem is that the detection accuracy depends on the characteristic judgment of each component, because the blast furnace ash contains coke, ash residue, unburned coal powder and the like, the components are complex, especially the unburned coal powder depends on manual experience under a microscope, and accurate data is difficult to obtain; only quantitative analysis can be carried out, and component separation cannot be carried out.
Chinese patent application publication No. CN100393420A discloses a method for separating iron and carbon from fly ash, which comprises a mixer, a water storage tank, a transfer pump, an electromagnetic separation tower, a filter and a dryer to form a separation system, so as to separate iron and carbon from fly ash. The main problem is that only iron and carbon can be analyzed, and the coke powder and coal powder contained in the carbon cannot be separated.
Determining the content of unburned coal powder and coke in the ironmaking blast furnace ash has very important theoretical guidance significance for coal type selection, coal injection quantity and coal injection process in the blast furnace ironmaking process.
The prior art can not realize the accurate separation of unburned coal powder and coke powder in the blast furnace dust.
Disclosure of Invention
The invention aims to provide a method for separating carbon-containing components from blast furnace fly ash, which mainly solves the technical problem that unburned coal powder and coke powder in the existing blast furnace fly ash cannot be accurately separated.
The technical scheme adopted by the invention is that the method for separating the carbon-containing components in the blast furnace dust comprises the following steps:
1) preparing 500mL of zinc chloride solution with the mass volume concentration of 1.7-1.8g/mL, adding 350-400g of zinc chloride powder into a beaker filled with 500mL of water, and uniformly stirring to completely dissolve the zinc chloride powder in the water to obtain the zinc chloride solution with the mass volume concentration of 1.7-1.8 g/mL;
2) separating unburned coal powder in blast furnace fly ash, weighing 100g of blast furnace fly ash sample, adding 100g of blast furnace fly ash into the zinc chloride solution in the step 1), stirring for 4-6min, standing for 25-35min, and layering the suspension; leading out and filtering the upper layer of the solution to obtain solid particles and filtrate, and fully washing the solid particles by deionized water to obtain unburned coal powder;
3) drying the unburned coal powder, and drying the separated unburned coal powder to obtain dried unburned coal powder with mass m1In units of g;
4) separating unburned coke powder in blast furnace dust, pouring the filtrate obtained by filtering the upper layer in the step 2) into an original beaker to be mixed with the solution of the lower layer, placing the beaker into a water bath to be heated to 85-95 ℃, adding 450g of zinc chloride powder into the beaker again, uniformly stirring to obtain a zinc chloride solution with the mass volume concentration of 2.1-2.3g/mL, continuously stirring for 4-6min, standing for 25-35min, and layering the suspension liquid; leading out the upper solution, filtering to obtain solid particles and filtrate, and fully washing the solid particles with deionized water to obtain unburned coke powder;
5) drying the unburned coke powder, and drying the separated unburned coke powder to obtain dried unburned coal powder with mass m2In units of g;
6) calculating the content of carbon-containing components in the blast furnace fly ash and the unburned coal powder in the blast furnace fly ashThe mass percentage of (A) is calculated according to a formula I, X1＝(m1/mTest for) X100%, formula one, wherein X1The mass percentage of unburned coal powder in the blast furnace dust removal ash is shown; m is1The content of unburned coal powder in the sample is g; m isTest forWeighing 100g of blast furnace dust sample; the mass percentage of unburned coke powder in the blast furnace fly ash is calculated according to a formula I, and X2＝(m1/mTest for) X100%, formula two, in formula two, X2Is the mass percentage of unburned coke powder in the blast furnace dust; m is1The content of unburned coke powder in the sample is g; m isTest forThe weight of the sample is 100 g.
The method of the invention is based on the following studies of the applicant:
the zinc chloride solution is used as the separation liquid, because the zinc chloride is easy to dissolve in water and has the highest solubility in solid salt, the solubility of the zinc chloride in water at normal temperature reaches 432g/100ml (25 ℃), the solubility of the zinc chloride in water at 100 ℃ reaches 612g/100ml (100 ℃), and the density of the zinc chloride solution can reach 1.10-3.00 g/ml; the density of the pulverized coal is detected to be 1.50-1.60mg/ml, and the density of the coke powder is detected to be 1.90-2.00 g/ml; the density of the mineral powder is 2.90-3.00 g/ml. The density of the zinc chloride solution covers the densities of three substances in the blast furnace dust, and the pulverized coal, the coke powder and the mineral powder can be separated by preparing the zinc chloride solution with different densities.
Firstly, ZnCl with the density of 1.70-1.80g/mL is prepared2The solution has the density between 1.50-1.60mg/ml of unburned coal powder and 1.90-2.00g/ml of unburned coke powder, and can separate the unburned coal powder from the blast furnace ash; then ZnCl with the density of 2.20-2.30g/mL is obtained by adding zinc chloride2The solution, which has a density between 1.90-2.00g/ml of unburned coke powder and 2.90-3.00g/ml of minerals, can separate the coke powder from the blast furnace dust.
The invention skillfully utilizes the large solubility of the zinc chloride solution to obtain the zinc chloride solution with different densities, so that the density of the zinc chloride solution can cover the density ranges of the unburned coal powder, the unburned coke powder and the mineral powder. By preparing zinc chloride solutions with different concentrations, the purpose of separating unburned coal powder and unburned coke powder is achieved. Theoretical support can be provided for the working condition optimization of the iron-making blast furnace through the analysis of each component.
Compared with the prior art, the invention has the following positive effects: 1. the method for separating the ironmaking blast furnace ash can separate unburned coal powder and unburned coke powder of carbon-containing components in the ironmaking blast furnace ash. 2. The separation process does not affect the physical and chemical properties of the components, and provides support for separately researching the properties of the unburned coal powder and the unburned coke powder. 3. The method has the advantages of simple process, simple and convenient operation, low cost, good separation effect and remarkable social benefit and economic value.
Detailed Description
The present invention will be further illustrated below with reference to specific embodiments, which are to be understood as merely illustrative and not limitative of the scope of the present invention.
Example 1 weighing a volume of 3200m3Blast furnace dust sample No. 1 of the blast furnace 100g, sample 1.
A method for separating carbon-containing components from blast furnace dust comprises the following steps:
1) 500mL of zinc chloride solution with the mass volume concentration of 1.8g/mL is prepared, 400g of zinc chloride powder is added into a beaker filled with 500mL of water, and the zinc chloride solution with the mass volume concentration of 1.8g/mL is obtained after uniform stirring;
2) separating unburned coal powder in blast furnace fly ash, weighing 100g of blast furnace fly ash sample, adding 100g of blast furnace fly ash into the zinc chloride solution in the step 1), stirring for 4-6min, standing for 25-35min, and layering the suspension; leading out and filtering the upper layer of the solution to obtain solid particles and filtrate, and fully washing the solid particles by deionized water to obtain unburned coal powder;
3) drying the unburned coal powder, and drying the separated unburned coal powder to obtain dried unburned coal powder with mass m1In units of g;
4) separating unburned coke powder in blast furnace dust, pouring the filtrate obtained after filtering the upper layer in the step 2) into an original beaker to be mixed with the solution of the lower layer, placing the beaker into a water bath kettle to be heated to 85-95 ℃, adding 400g of zinc chloride powder into the beaker again, uniformly stirring to obtain a zinc chloride solution with the mass volume concentration of 2.2g/mL, continuously stirring for 4-6min, standing for 25-35min, and layering the suspension liquid; leading out the upper solution, filtering to obtain solid particles and filtrate, and fully washing the solid particles with deionized water to obtain unburned coke powder;
5) drying the unburned coke powder, and drying the separated unburned coke powder to obtain dried unburned coal powder with mass m2In units of g;
6) calculating the content of carbon-containing components in the blast furnace fly ash, wherein the mass percentage of unburned coal powder in the blast furnace fly ash is calculated according to a formula I, and X1＝(m1/mTest for) X100%, formula one, wherein X1The mass percentage of unburned coal powder in the blast furnace dust removal ash is shown; m is1The content of unburned coal powder in the sample is g; m isTest forWeighing 100g of blast furnace dust sample; the mass percentage of unburned coke powder in the blast furnace fly ash is calculated according to a formula I, and X2＝(m1/mTest for) X100%, formula two, in formula two, X2Is the mass percentage of unburned coke powder in the blast furnace dust; m is1The content of unburned coke powder in the sample is g; m isTest forThe weight of the sample is 100 g.
Example 2 weighing volume 3200m3Blast furnace dust sample No. 2 of the blast furnace 100g, sample 2.
A method for separating carbon-containing components from blast furnace dust comprises the following steps:
1) 500mL of zinc chloride solution with the mass volume concentration of 1.7g/mL is prepared, 350g of zinc chloride powder is added into a beaker filled with 500mL of water, and the zinc chloride solution with the mass volume concentration of 1.7g/mL is obtained after uniform stirring;
2) separating unburned coal powder in blast furnace fly ash, weighing 100g of blast furnace fly ash sample, adding 100g of blast furnace fly ash into the zinc chloride solution in the step 1), stirring for 4-6min, standing for 25-35min, and layering the suspension; leading out and filtering the upper layer of the solution to obtain solid particles and filtrate, and fully washing the solid particles by deionized water to obtain unburned coal powder;
3) drying the unburned coal powder, and drying the separated unburned coal powder to obtain dried unburned coal powder with mass m1In units of g;
4) separating unburned coke powder in blast furnace dust, pouring the filtrate obtained after filtering the upper layer in the step 2) into an original beaker to be mixed with the solution of the lower layer, placing the beaker into a water bath kettle to be heated to 85-95 ℃, adding 450g of zinc chloride powder into the beaker again, uniformly stirring to obtain a zinc chloride solution with the mass volume concentration of 2.2g/mL, continuously stirring for 4-6min, standing for 25-35min, and layering the suspension liquid; leading out the upper solution, filtering to obtain solid particles and filtrate, and fully washing the solid particles with deionized water to obtain unburned coke powder;
5) drying the unburned coke powder, and drying the separated unburned coke powder to obtain dried unburned coal powder with mass m2In units of g;
6) calculating the content of carbon-containing components in the blast furnace fly ash, wherein the mass percentage of unburned coal powder in the blast furnace fly ash is calculated according to a formula I, and X1＝(m1/mTest for) X100%, formula one, wherein X1The mass percentage of unburned coal powder in the blast furnace dust removal ash is shown; m is1The content of unburned coal powder in the sample is g; m isTest forWeighing 100g of blast furnace dust sample; the mass percentage of unburned coke powder in the blast furnace fly ash is calculated according to a formula I, and X2＝(m1/mTest for) X100%, formula two, in formula two, X2Is the mass percentage of unburned coke powder in the blast furnace dust; m is1The content of unburned coke powder in the sample is g; m isTest forThe weight of the sample is 100 g.
Example 3 weighing the volume to 1280m3Blast furnace dust sample No. 3 of the blast furnace 100g, sample No. 3.
A method for separating carbon-containing components from blast furnace dust comprises the following steps:
1) 500mL of zinc chloride solution with the mass volume concentration of 1.8g/mL is prepared, 400g of zinc chloride powder is added into a beaker filled with 500mL of water, and the zinc chloride solution with the mass volume concentration of 1.8g/mL is obtained after uniform stirring;
2) separating unburned coal powder in blast furnace fly ash, weighing 100g of blast furnace fly ash sample, adding 100g of blast furnace fly ash into the zinc chloride solution in the step 1), stirring for 4-6min, standing for 25-35min, and layering the suspension; leading out and filtering the upper layer of the solution to obtain solid particles and filtrate, and fully washing the solid particles by deionized water to obtain unburned coal powder;
3) drying the unburned coal powder, and drying the separated unburned coal powder to obtain dried unburned coal powder with mass m1In units of g;
4) separating unburned coke powder in blast furnace dust, pouring the filtrate obtained after filtering the upper layer in the step 2) into an original beaker to be mixed with the solution of the lower layer, placing the beaker into a water bath kettle to be heated to 85-95 ℃, adding 450g of zinc chloride powder into the beaker again, uniformly stirring to obtain a zinc chloride solution with the mass volume concentration of 2.3g/mL, continuously stirring for 4-6min, standing for 25-35min, and layering the suspension liquid; leading out the upper solution, filtering to obtain solid particles and filtrate, and fully washing the solid particles with deionized water to obtain unburned coke powder;
5) drying the unburned coke powder, and drying the separated unburned coke powder to obtain dried unburned coal powder with mass m2In units of g;
6) calculating the content of carbon-containing components in the blast furnace fly ash, wherein the mass percentage of unburned coal powder in the blast furnace fly ash is calculated according to a formula I, and X1＝(m1/mTest for) X100%, formula one, wherein X1The mass percentage of unburned coal powder in the blast furnace dust removal ash is shown; m is1The content of unburned coal powder in the sample is g; m isTest forWeighing 100g of blast furnace dust sample; the mass percentage of unburned coke powder in the blast furnace fly ash is calculated according to a formula I, and X2＝(m1/mTest for) X100%, formula two, in formula two, X2Is the mass percentage of unburned coke powder in the blast furnace dust; m is1The content of unburned coke powder in the sample is g; m isTest forThe weight of the sample is 100 g.
The blast furnace fly ash samples in examples 1-3 were respectively detected by the chemical analysis method specified in the Chinese national standard GB/T223.71-1997 determination of carbon content by gravimetric method after combustion in tube furnace to obtain the carbon content, which is the sum of unburned coal powder and unburned coke powder; the blast furnace fly ash samples in examples 1 to 3 were respectively examined by an optical microscope to obtain the ratio of unburned coal powder to unburned coke powder, as shown in table 1;
the blast furnace dust was quantitatively analyzed by the above three methods, and the obtained data of unburned coal powder and unburned coke powder are shown in table 1.
Table 1, the carbon-containing components in the blast furnace dust of the examples of the present invention, in units: and (4) weight percentage.
As can be seen from Table 1, the difference between the unburned coal powder in the method of the invention and the method of the microscope is less than 1.0%, and the difference between the unburned coke powder is less than 1.0%; compared with a chemical method and a microscopic method, the difference value of the sum of unburned coal powder and coke powder in the method is less than 2.0 percent. According to the coke optical tissue determination method of the industrial standard YB/T077-2008, the precision of the components is 2% when the components are less than 10%, and the precision of the components is 3% when the components are 10-30%. Therefore, the detection result of the method is consistent with that of the national standard chemical analysis method.
The method for separating the ironmaking blast furnace ash can separate the ironmaking blast furnace ash into unburned coal powder and unburned coke powder, and the unburned coal powder and the unburned coke powder can be measured by a microscope method but cannot be separated; the chemical rule is only able to measure the carbon content, i.e. the sum of the unburned coal powder and the unburned coke powder. The invention separates the unburned coal powder and the unburned coke powder, is beneficial to analyzing the physical and chemical properties of each component independently, and can provide theoretical support for the working condition optimization of the iron-making blast furnace.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (1)
1. A method for separating carbon-containing components from blast furnace dust is characterized by comprising the following steps:
1) preparing 500mL of zinc chloride solution with the mass volume concentration of 1.7-1.8g/mL, adding 350-400g of zinc chloride powder into a beaker filled with 500mL of water, and uniformly stirring to completely dissolve the zinc chloride powder in the water to obtain the zinc chloride solution with the mass volume concentration of 1.7-1.8 g/mL;
2) separating unburned coal powder in blast furnace fly ash, weighing 100g of blast furnace fly ash sample, adding 100g of blast furnace fly ash into the zinc chloride solution in the step 1), stirring for 4-6min, standing for 25-35min, and layering the suspension; leading out and filtering the upper layer of the solution to obtain solid particles and filtrate, and fully washing the solid particles by deionized water to obtain unburned coal powder;
3) drying the unburned coal powder, and drying the separated unburned coal powder to obtain dried unburned coal powder with mass m1In units of g;
4) separating unburned coke powder in blast furnace dust, pouring the filtrate obtained by filtering the upper layer in the step 2) into an original beaker to be mixed with the solution of the lower layer, placing the beaker into a water bath to be heated to 85-95 ℃, adding 450g of zinc chloride powder into the beaker again, uniformly stirring to obtain a zinc chloride solution with the mass volume concentration of 2.1-2.3g/mL, continuously stirring for 4-6min, standing for 25-35min, and layering the suspension liquid; leading out the upper solution, filtering to obtain solid particles and filtrate, and fully washing the solid particles with deionized water to obtain unburned coke powder;
5) drying the unburned coke powder, and drying the separated unburned coke powder to obtain dried unburned coal powder with mass m2In units of g;
6) calculating the content of carbon-containing components in the blast furnace fly ash, wherein the mass percentage of unburned coal powder in the blast furnace fly ash is calculated according to a formula I, and X1＝(m1/mTest for) X100%, formula one, wherein X1The mass percentage of unburned coal powder in the blast furnace dust removal ash is shown; m is1The content of unburned coal powder in the sample is g; m isTest forWeighing 100g of blast furnace dust sample; the mass percentage of unburned coke powder in the blast furnace fly ash is calculated according to a formula I, and X2＝(m1/mTest for) X100%, formula two, in formula two, X2Is the mass percentage of unburned coke powder in the blast furnace dust; m is1The content of unburned coke powder in the sample is g; m isTest forThe weight of the sample is 100 g.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1414116A (en) * | 2002-09-19 | 2003-04-30 | 宝山钢铁股份有限公司 | Detecting and analyzing method of unburned coal powder content in blast furnace dust |
| CN101929995A (en) * | 2009-06-25 | 2010-12-29 | 宝山钢铁股份有限公司 | Method for determining content of pulverized coal, coke and iron-containing charge in blast furnace dust |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1414116A (en) * | 2002-09-19 | 2003-04-30 | 宝山钢铁股份有限公司 | Detecting and analyzing method of unburned coal powder content in blast furnace dust |
| CN101929995A (en) * | 2009-06-25 | 2010-12-29 | 宝山钢铁股份有限公司 | Method for determining content of pulverized coal, coke and iron-containing charge in blast furnace dust |
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