The method of neutralization of chlorine-containing gases in magnesium production

 

(57) Abstract:

The objective of the invention is to eliminate the disadvantages and improving the reliability of the process of conversion of chlorine in hydrogen chloride. The method of neutralization of chlorine-containing gases in magnesium production involves mixing chlorine gas with the air getting chlorobutanol mixture, feeding the mixture into the flame of the burning fuel, the recovery in the combustion process the mixture until hydrogen chloride with subsequent disposal of the resulting hydrogen chloride. This chlorobutanol mixture prior to being fed into the torch burning continuously mixed with the fuel receiving gas fuel mixture, then the mixture is recycled chlorine-containing gas, such as anodic chlorine with chlorine 70-93%, and mix until the chlorine content of the mixture is not less than 200 g per 1 m3air. Chlorobutanol mixture is mixed with fuel at a ratio of 1 : (20-30), the concentration of chlorine in chlorobutanol mixture before mixing with the fuel support of 5-150 g per 1 m3air. As the chlorinated mixture supplied to the mixing with the fuel, use of gases santenots from the electrolysis process harmegnies raw material gases from the chlorination process dehydrated carnallite, exhaust gases ssenoga raw materials with the subsequent receipt of magnesium chloride or calcium hypochlorite with obtaining calcium chloride. 8 C.p. f-crystals.

The invention relates to ferrous metallurgy, to methods for neutralization of exhaust gases, in particular chlorine generated during the production of magnesium by electrolysis of molten salts.

Known methods of neutralization of chlorine-containing gases in magnesium production (ed.mon. USSR N 140211, publ. BI N 15 1961; ed.mon. N 197951 publ. BI N 13 1967; ed.mon. N 306861 published. BI 20 1971; 695685 publ. BI N 41 1979. by burning chlorine-containing gas in the torch burning fuel (gaseous or liquid). At high temperatures, chlorine gas when mixed with air interacts with the hydrocarbons into hydrogen chloride.

The disadvantage of these methods is that the combustion process takes place unstable, possible breakdowns the torch burning.

There is a method of neutralization of chlorine-containing gases in magnesium production (patent RF N 1629243, publ. BI 7 1991) - prototype, including the filing with the torch burning fuel mixture of chlorine with air to a concentration of 200-480 g of chlorine on the 13air recovery in the combustion mixture to hydrogen chloride at a thermal tension in the combustion zone 10-40 GJ/m3when the ratio of air flow rate of 1.1 to 1.6, with subsequent disposal of abrazos air to the concentration of chlorine in the mixture of 200-300 g per 1 m3air there is a "breakthrough" of the flame to the burner, claps, unstable combustion and disruption of the torch. This leads to heating of the burner.

The objective of the invention is to eliminate the disadvantages and improving the reliability of the process of conversion of chlorine in hydrogen chloride.

This task is solved in that in the method of neutralization of chlorine-containing gases in magnesium production, including mixing chlorine gas with the air getting chlorobutanol mixture, feeding the mixture into the flame of the burning fuel, the recovery in the combustion process the mixture until hydrogen chloride with subsequent disposal of the resulting hydrogen chloride, it is new that pre chlorobutanol mixture prior to being fed into the torch burning continuously mixed with the fuel receiving gas fuel mixture, then the mixture is recycled chlorine-containing gas and is mixed with gas fuel mixture to the chlorine content of not less than 200 g/m3.

In addition, chlorobutanol mixture is mixed with fuel at a ratio of 1: (20-30).

In addition, the concentration of chlorine in chlorobutanol mixture before mixing with the fuel support of 5-150 g per 1 m3air.

Also the ECCA electrolysis harmegnies raw materials, gases from the chlorination process dehydrated carnallite, exhaust gases from the fluidized bed furnaces.

In addition, after mixing with the fuel as a chlorine-containing gas using anodic chlorine from the electrolysis process with a concentration of 70-93%.

In addition, natural gas is fed to the mixing perpendicular to the motion chlorobutanol mixture.

In addition, chlorine gas is fed perpendicular to the flow of gas fuel mixture.

In addition, disposal of the resulting hydrogen chloride is carried suspension of magnesium-containing oxide materials with the subsequent receipt of magnesium chloride.

In addition, disposal of the resulting hydrogen chloride is carried hypochlorite calcium receipt of calcium chloride.

Mixing chlorobutanol mixture to the combustion of natural gas allows the reaction processes with a relatively low speed. This is determined by the diffusion processes in which the formation of intermediate reaction products:

CH4+ Cl2= CH3Cl + HCl (1)

CH3Cl + Cl2= CH2Cl2+ HCl (2)

CH2Cl2+ Cl2= CHCl3+ HCl (3)

CHCl3+ Cl2= CCl4+ HCl (4)

the efficiency of the interaction of the remaining portion of the fuel chlorobutanol mixture, reducing unsustainable burning torch, improves the reliability of the conversion process.

The fuel supply is perpendicular chlorobutanol mixture allows uniform mixing of components in the mixture and thereby improve the reliability of the process of conversion of hydrogen chloride.

The flow of chlorine gas perpendicular to the gas fuel mixture allows uniform mixing of components in the mixture and thereby improve the reliability of the process of conversion of hydrogen chloride.

Conducted by the applicant's analysis of the prior art, including searching by the patent and scientific and technical information sources, and identify sources that contain information about the equivalents of the claimed invention, has allowed to establish that the applicant had not found the source, which is characterized by signs, identical all the essential features of the invention. The definition from the list of identified unique prototype, as the most similar set of features analogue, has allowed to establish the essential towards perceived by the applicant to the technical result of the distinctive features in the proposed method, set forth in the claims.

Examples of the method.

Example 1. Chlorine-containing gases in magnesium production (anode chlorine gas), consisting of 75% of chlorine and 20 vol.% air is mixed with air to a concentration of chlorine in chlorobutanol a mixture of 115 g/m3air. Chlorine consumption 100 m3/hour and air 2000 m3/hour. Chlorobutanol the mixture is continuously mixed in a tube with fuel, for example natural gas, containing, vol.%: CH495,8-99,7; C2H60.1 TO 6%; C3H80.1; CO2to 0.2; N20,2-4,0, in the ratio 1: (20-30), and fuel serves continuously and perpendicular to the motion chlorobutanol mixture in quantities of 1000 m3/hour. Then in the gas fuel mixture, which moves the second chlorine) with a concentration of 70-93%, mix with the gas fuel mixture to the concentration of chlorine of not less than 200 g/m3air and fed to the burner for combustion. The temperature in the combustion zone 1010-1600oC. the combustion Process is proceeding steadily, without explosion and leakage of chlorine. The products of combustion of the fuel and chlorine have a temperature of 1240oC and consist Society.%: CO26,1; H2O 2,4; N261,8; O29,3; HCl 20,4; Cl2O. the resulting hydrogen chloride utilized by passing through the magnesium oxide raw materials, such as brucite or through calcium hypochlorite.

Example 2.

As the chlorinated mixture supplied to the mixing with the fuel, use of gases santenots from the electrolysis process harmegnies raw materials (chlorine content in gases up to 6 g/m3), or gases from the chlorination process dehydrated carnallite (the chlorine content of not more than 20 g/m3), or exhaust gases from the fluidized bed furnaces (the chlorine content of not more than 0.5 g/m3). Chlorobutanol the mixture is continuously mixed in a tube with fuel, for example natural gas, containing, vol.%: CH495,8-99,7; C2H60.1 TO 6; C3H80.1; CO2to 0.2; N20,2-4,0, in the ratio 1:(20-30), and fuel serves continuously and perpendicular to the motion chlorobutanol mixture, again served perpendicular to the motion of the mixture of chlorine gas (anode chlorine) with a concentration of 70-93%, is mixed with the gas fuel mixture to a chlorine concentration of not less than 200 g/m3air and fed to the burner for combustion. The temperature in the combustion zone 1010-1600oC. the combustion Process is proceeding steadily, without explosion and leakage of chlorine. The products of combustion of the fuel and chlorine have a temperature of 1240oC and consist Society.%: CO26,1; H2O 2,4; N261,8; O29,3; HCl 20,4; Cl20. The resulting hydrogen chloride utilized by passing through the magnesium oxide raw materials, such as brucite or through calcium hypochlorite.

Thus, the proposed method of disposal of chlorine-containing gases in magnesium production will make the process stable and reliable, except for "slippage" of the flame to the burner, claps, unstable combustion and disruption of the torch.

1. The method of neutralization of chlorine-containing gases in magnesium production, including mixing chlorine gas with the air getting chlorobutanol mixture, feeding the mixture into the flame of the burning fuel, the recovery in the combustion process the mixture until hydrogen chloride with subsequent disposal of the resulting hydrogen chloride, ExC fuel with getting gas fuel mixture, then, the resulting mixture is recycled chlorine-containing gas, to mix the chlorine content of the mixture is not less than 200 g per 1 m3air.

2. The method according to p. 1, characterized in that chlorobutanol mixture is mixed with fuel at a ratio of 1 : (20 to 30).

3. The method according to p. 1, characterized in that the concentration of chlorine in chlorobutanol mixture before mixing with the fuel support 5 - 150 g per 1 m3air.

4. The method according to p. 1, characterized in that as the chlorinated mixture supplied to the mixing with the fuel, use of gases santenots from the electrolysis process harmegnies raw material gases from the chlorination process dehydrated carnallite, exhaust gases from the fluidized bed furnaces.

5. The method according to p. 1, characterized in that after mixing with the fuel as a chlorine-containing gas using anodic chlorine from the electrolysis process with a concentration of 70 to 93%.

6. The method according to p. 1, wherein the natural gas is fed to the mixing perpendicular to the motion chlorobutanol mixture.

7. The method according to p. 1, characterized in that the chlorine-containing gas is fed perpendicular to the flow of gas fuel mixture.

8. The method according to p. 1, characterized in that the recycling polum of magnesium chloride.

9. The method according to p. 1, characterized in that the recycling of the resulting hydrogen chloride is carried hypochlorite calcium with subsequent receipt of calcium chloride.

 

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SUBSTANCE: claimed method includes junk charge into premelted flux at ratio of 1:(5-10); heating up to melt temperature; smelting under flux layer, and separation of metal from flux. Equimolar mixture of sodium chloride and potassium chloride with addition of 2.9-52.6 % (in respect to total flux weight) magnesium fluoride is used as flux, and in melting process flux layer with thickness of 4.5-20 cm is maintained. Method affords the ability to conserve original composition and eliminate additional burdening with magnesium.

EFFECT: decreased burn-off loss, especially for magnesium, metal of improved quality.

4 cl, 3 tbl, 5 ex

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