CN115786706A - Method for reducing and smelting lead, bismuth and the like by using biomass gas - Google Patents
Method for reducing and smelting lead, bismuth and the like by using biomass gas Download PDFInfo
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- 229910052797 bismuth Inorganic materials 0.000 title claims abstract description 79
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 title claims abstract description 73
- 238000003723 Smelting Methods 0.000 title claims abstract description 62
- 239000002028 Biomass Substances 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000007789 gas Substances 0.000 claims abstract description 64
- 239000000446 fuel Substances 0.000 claims abstract description 25
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000002309 gasification Methods 0.000 claims abstract description 16
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 16
- 239000001301 oxygen Substances 0.000 claims abstract description 16
- 230000033116 oxidation-reduction process Effects 0.000 claims abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 22
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 21
- 239000002893 slag Substances 0.000 claims description 19
- 239000002994 raw material Substances 0.000 claims description 17
- 239000000779 smoke Substances 0.000 claims description 17
- 239000000428 dust Substances 0.000 claims description 16
- 229910052742 iron Inorganic materials 0.000 claims description 11
- 229910001152 Bi alloy Inorganic materials 0.000 claims description 10
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 10
- 235000012239 silicon dioxide Nutrition 0.000 claims description 10
- 239000000377 silicon dioxide Substances 0.000 claims description 10
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 9
- 239000000292 calcium oxide Substances 0.000 claims description 9
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 9
- 239000002737 fuel gas Substances 0.000 claims description 9
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- 238000005868 electrolysis reaction Methods 0.000 claims description 6
- 230000005484 gravity Effects 0.000 claims description 6
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 5
- 239000003546 flue gas Substances 0.000 claims description 5
- 239000002023 wood Substances 0.000 claims description 5
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 4
- 239000001569 carbon dioxide Substances 0.000 claims description 4
- 238000000197 pyrolysis Methods 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 3
- 238000007664 blowing Methods 0.000 claims description 2
- 239000003638 chemical reducing agent Substances 0.000 claims description 2
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- 238000007670 refining Methods 0.000 claims description 2
- 238000001035 drying Methods 0.000 claims 1
- 239000000203 mixture Substances 0.000 claims 1
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 abstract description 14
- 239000000571 coke Substances 0.000 abstract description 12
- 238000002485 combustion reaction Methods 0.000 abstract description 4
- 239000003795 chemical substances by application Substances 0.000 abstract description 2
- 239000003344 environmental pollutant Substances 0.000 abstract description 2
- 231100000719 pollutant Toxicity 0.000 abstract description 2
- 238000005235 decoking Methods 0.000 abstract 1
- 238000010310 metallurgical process Methods 0.000 abstract 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000011593 sulfur Substances 0.000 description 4
- DLYUQMMRRRQYAE-UHFFFAOYSA-N tetraphosphorus decaoxide Chemical compound O1P(O2)(=O)OP3(=O)OP1(=O)OP2(=O)O3 DLYUQMMRRRQYAE-UHFFFAOYSA-N 0.000 description 4
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- 229910052751 metal Inorganic materials 0.000 description 2
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- 238000005245 sintering Methods 0.000 description 2
- 241000609240 Ambelania acida Species 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- AJZRPMVVFWWBIW-UHFFFAOYSA-N [Au].[Bi] Chemical compound [Au].[Bi] AJZRPMVVFWWBIW-UHFFFAOYSA-N 0.000 description 1
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- 239000010905 bagasse Substances 0.000 description 1
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- 238000004939 coking Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- TXKMVPPZCYKFAC-UHFFFAOYSA-N disulfur monoxide Inorganic materials O=S=S TXKMVPPZCYKFAC-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention provides a method for reducing and smelting lead, bismuth and the like by using biomass gas, which comprises the steps of preparing biomass fuel into combustible gas by using biomass gasification equipment, introducing the combustible gas and mixed air mixed with oxygen in advance into the reducing and smelting equipment for lead, bismuth and the like, wherein the mixed gas is a combustion improver, meeting the reduction agent amount and heat required by a smelting process by controlling the flow of the combustible gas, controlling the oxidation-reduction atmosphere of reducing and smelting by adjusting the ratio of the combustion improver gas and the combustible gas, realizing the reformation of a decoking metallurgical process of reducing and smelting lead and bismuth, reducing the metallurgical cost of the traditional lead, bismuth and the like which use coke as fuel, and reducing the emission amount of metallurgical sulfur dioxide pollutants of the traditional lead, bismuth and the like which use coke as fuel.
Description
Technical Field
The invention belongs to the technical field of energy recycling of agricultural and forestry wastes and the like, relates to a reduction smelting technology of metals such as lead, bismuth and the like, and particularly relates to a method for reduction smelting of lead, bismuth and the like by using biomass gas.
Background
The biomass fuel is fuel which is formed by burning biomass materials, generally mainly agricultural and forestry wastes such as straw, sawdust, bagasse, rice chaff and the like, and is mainly different from fossil fuel. At present, biomass fuel is mainly applied to steam boiler heat supply, the difficulty of application in the metallurgical field is that the heat value is low, and the requirement of metal smelting is difficult to achieve, for example, the invention patent CN 115181597A discloses a biomass fuel and a preparation method thereof, and the application in iron ore sintering, biomass is carbonized under the condition of no oxygen and then mixed with dust mud for being used for iron ore sintering, but because the heat value is limited, the fuel gas production amount and the produced gas heat of the over-low heat value can not meet the gas process parameters required by the original smelting, the biomass fuel must be shared with coking coal, and a large amount of dust can be generated, the biomass fuel is prepared into combustible gas to be applied to the reducing smelting metallurgical industries of lead, bismuth and the like, on one hand, the application field of biomass fuel of agriculture and forestry wastes and the like is widened, on the other hand, the coke use in the traditional reducing smelting process of lead and bismuth is replaced, the smelting cost is reduced, meanwhile, because the biomass fuel does not contain sulfur and sulfur dioxide and phosphorus pentoxide are not generated during combustion, so acid rain can not be generated, and the environment can not be polluted. The coke used in the traditional reduction smelting of lead, bismuth and the like is used as fuel, so that the production cost is high, and meanwhile, the sulfur contained in the coke increases the emission of sulfur dioxide in flue gas.
Disclosure of Invention
Based on the current situation of the background, in order to solve the technical problems, the biomass gasification equipment is used for preparing the biomass fuel into the combustible gas and introducing the combustible gas into the reduction smelting equipment such as lead, bismuth and the like, so that the environmental pollution risk of the emission of sulfur dioxide and phosphorus pentoxide in the traditional reduction smelting process of lead, bismuth and the like is reduced, the consumption of coke metallurgical fuel is replaced, and the metallurgical cost is reduced.
The technical problem to be solved by the invention is realized by the following technical scheme:
a method for reducing and smelting lead, bismuth and the like by using biomass gas comprises the following steps:
s1: preparing combustible gas: the biomass fuel is converted into biomass fuel gas which is prepared into fuel gas with the temperature of 120-250 ℃ and the heat value of 10-12MJ/m < 3 > and is used as combustible gas;
s2: reduction smelting: adding furnace-entering raw materials containing lead and bismuth into lead-bismuth reduction smelting equipment, introducing combustible gas obtained in the step S1 and combustion-supporting gas containing oxygen into the lead-bismuth reduction smelting equipment, combusting in the lead-bismuth reduction smelting equipment, and reducing the lead and bismuth to obtain lead-bismuth alloy; the flow of combustible gas is controlled to meet the amount of the reducing agent and the heat required by the smelting process, and the proportion of the combustion-supporting gas and the combustible gas is adjusted to control the oxidation-reduction atmosphere of reduction smelting;
s3: carrying out an electrolysis process on the lead-bismuth alloy obtained in the step S2 to obtain refined lead and bismuth anode mud, and refining the bismuth anode to obtain refined bismuth;
s4: collecting dust: collecting the smoke dust with larger gravity from the smoke gas in the S2 by a gravity dust collector, filtering the smoke dust with smaller gravity by a bag-type dust collector to obtain common smoke gas and lead and bismuth containing smoke dust, and sending the lead and bismuth containing smoke dust into reduction smelting equipment such as lead, bismuth and the like in the S2; the common flue gas is purified and discharged after reaching the standard.
In a further improvement, the specific steps of step S1 are as follows:
feeding biomass fuel with the heat value of 16-20MJ/kg into biomass gasification equipment, blowing air into the bottom of the biomass gasification equipment by a furnace bottom blower, fully combusting the air with carbon on an oxidation layer at the lowest part of a gasification furnace to generate carbon dioxide and a small amount of furnace slag, discharging the furnace slag from a furnace bottom slag discharge port, reacting the carbon dioxide with the carbon on a reduction layer from bottom to top to generate carbon monoxide, mixing the carbon monoxide with dry distillation wood gas and water vapor generated on an upper dry distillation layer and a middle dry distillation layer of the gasification furnace to form biomass fuel gas, and conveying the combustible gas to the reduction smelting furnace in S2 by a furnace top exhaust fan; the temperature of the combustible gas is adjusted through the blast volume at the bottom of the furnace and the air guiding volume at the top of the furnace, when the temperature is too high, the blast volume is reduced or the air guiding volume is increased at the same time, and when the temperature is too low, the blast volume is increased or the air guiding volume is reduced at the same time.
In a further improvement, the biomass fuel comprises wood chips and sawmilling powder; the biomass gasification equipment is a biomass gasification furnace; the combustion-supporting gas is air.
In a further improvement, in step S3, the electrolyte of the electrolysis process contains
Pb 2+ 70-130g/l,H 2 SiF 6 60-100g/l, and the conditions of the electrolysis process are as follows: current density of 130-180A/m 2 The voltage is 0.4-0.5V.
Further improvement, in step S2, 180-200Nm of raw material is added for each ton of raw material 3 Burner, 1200-1300Nm 3 Premixing air, wherein the flow of the premixed air is 6-7 times of the flow of gas, controlling the temperature of an air zone of the reduction smelting furnace to be 1050-1150 ℃, increasing the flow of combustible gas when the temperature is too low, reducing the flow of the combustible gas when the temperature is too high, controlling the CO concentration of flue gas at the outlet of the reduction smelting furnace to be 0.015-0.025%, if the CO concentration is too high, increasing the flow of the premixed air, and if the CO concentration is too low, reducing the flow of the premixed air.
In the S2, the oxygen concentration in the combustion-supporting gas is 22-24%.
In the step S2, the raw materials to be fed into the furnace comprise the following components in parts by weight: 18-25 parts of lead, 2-5 parts of bismuth, 18-22 parts of iron, 12-15 parts of silicon dioxide and 8-12 parts of calcium oxide.
Wherein, according to the component analysis result of the smelting raw material, the fluxing agents such as ferric oxide, quartz sand (the main component is silicon dioxide), calcium oxide and the like are supplemented properly.
If the content of lead and bismuth is lower than the lower limit, the unit metallurgical cost is too high, if the content of lead and bismuth is higher than the upper limit, the lead and bismuth are finally discharged out of the furnace, and the direct yield is reduced. When the iron is higher than the upper limit, the heat preservation effect of the slag is poor, the fluidity of the slag is poor when the iron is lower than the lower limit, the viscosity of the slag is increased when the silicon dioxide is higher than the upper limit, the slag is not easy to discharge, and the heat preservation effect of the slag is poor when the silicon dioxide is lower than the lower limit. The calcium oxide is higher than the upper limit, the melting point of the slag is too high, the metallurgical cost is increased, and the separation effect of lead and the slag is influenced when the melting point of the slag is lower than the lower limit.
According to the area of a hearth and the adding amount of raw materials, combustible gas for biomass gasification is introduced, mixed air oxygen of premixed oxygen is introduced as a combustion improver, mixed air (the oxygen concentration is 22% -24%) is controlled, if the oxygen concentration is lower than the lower limit combustion-supporting effect, the requirement cannot be met, the oxygen concentration is higher than the upper limit, and the service life of a tuyere pipe is shortened. The flow of combustible gas and combustion-supporting gas is controlled, the excess concentration of carbon monoxide in the tuyere area is required to be controlled to be (2% -5%), if the concentration is lower than the lower limit, the reducing atmosphere is insufficient, the recovery rate of lead and bismuth-gold is influenced, if the concentration is higher than the upper limit, fuel waste is caused, and the production cost is increased.
The beneficial effects of the invention comprise the following aspects:
1. the biomass fuel is prepared into combustible gas by using biomass gasification equipment and is introduced into lead, bismuth and other reduction smelting equipment, so that the application field of the biomass is widened, and the emission amount of metallurgical sulfur dioxide pollutants of the traditional lead, bismuth and other fuels taking coke as fuel is reduced.
2. The metallurgical cost of coke as fuel such as the traditional lead, bismuth and the like is reduced, the production cost of lead per ton can be reduced by 800-1000 yuan, the consumption of the metallurgical coke such as the traditional lead, bismuth and the like is greatly reduced, and the method makes a contribution to the national realization of the targets of carbon neutralization and carbon peak-reaching.
Drawings
Fig. 1 is a process flow diagram of a method for reducing and smelting lead, bismuth and the like by using biomass gas according to the invention.
Detailed Description
The invention is further illustrated by the following specific examples, which are not intended to be limiting and whose scope is indicated in the claims.
Example 1
120 tons of raw materials (5.2 percent of water, 20.2 percent of lead, 3.6 percent of bismuth, 21.4 percent of iron, 12.3 percent of silicon dioxide and 8.9 percent of calcium oxide) which are prepared and pressed into blocks are added into a furnace according to the feeding speed of 5 tons per hour, and the area of an air zone is 4m 2 6500 Nm/hr of mixed air containing 23% oxygen 3 1050Nm of fuel gas produced from biomass 3 . (the energy consumption of gas required by each ton of raw materials is 2310 MJ)
And (3) output: 24.3 tons of lead-bismuth alloy (83.8 percent of lead and 16 percent of bismuth), 6.5 tons of smoke (29 percent of lead and 2 percent of bismuth) and 75 tons of slag (0.97 percent of lead and 0.1 percent of bismuth).
Lead smelting direct yield: 88.6 percent, direct yield of bismuth smelting: 94.88 percent.
Example 2
128 tons of raw materials (5.10 percent of water, 21.60 percent of lead, 3.22 percent of bismuth, 22.51 percent of iron, 13.70 percent of silicon dioxide and 9.39 percent of calcium oxide) which are prepared and pressed into blocks are added into a furnace according to the feeding speed of 5.33 tons per hour, and the area of a wind zone is 4m 2 In a smelting furnace, oxygen content of 23 percent is introduced every hourMixed air 6610m 3 1090m fuel gas prepared by biomass 3 。
And (3) output: 27.8 tons of lead-bismuth alloy (containing 85.1% of lead and 13.6% of bismuth), 6.7 tons of smoke (containing 26% of lead and 1.8% of bismuth) and 79 tons of slag (containing 1.06% of lead and 0.1% of bismuth).
Lead smelting direct yield: 90.17%, direct yield of bismuth smelting: 93.57 percent.
Example 3
110 tons of raw materials (4.6 percent of water, 24.2 percent of lead, 4.6 percent of bismuth, 23.45 percent of iron, 12.70 percent of silicon dioxide and 11.5 percent of calcium oxide) which are prepared and pressed into blocks are added into a furnace according to the feeding speed of 4.58 tons per hour, and the area of a wind zone is 4m 2 The smelting furnace is filled with mixed air 5960m with the oxygen content of 22 percent per hour 3 960m fuel gas prepared from biomass 3 。
And (3) output: 26.8 tons of lead-bismuth alloy (containing 82.9% of lead and 16.4% of bismuth), 5.7 tons of smoke (containing 28.4% of lead and 2.3% of bismuth) and 68 tons of slag (containing 2.3% of lead and 0.4% of bismuth).
Lead smelting direct yield: 87.48 percent, and direct yield of bismuth smelting: 91.10 percent.
Example 4
120 tons of raw materials (5.2 percent of water, 20.2 percent of lead, 3.6 percent of bismuth, 21.4 percent of iron, 12.3 percent of silicon dioxide and 8.9 percent of calcium oxide) which are prepared and pressed into blocks are added into a furnace according to the feeding speed of 5 tons per hour, and the area of a wind zone is 4m 2 The smelting furnace is filled with mixed air 6500m with oxygen content of 23 percent per hour 3 500 kg of coke is added per hour. (the energy consumption of coke required by each ton of raw material is 2840 MJ) is more than 530MJ consumed by using combustible gas, the sulfur content of the coke is 0.6 percent, 3 kilograms of sulfur are required to be fed into the furnace for each ton of raw material to generate 6 kilograms of sulfur dioxide, and 29 kilograms of sulfur dioxide are generated for each ton of lead-bismuth alloy
And (3) output: 24.5 tons of lead-bismuth alloy (83.7% of lead and 15.9% of bismuth), 6.4 tons of smoke (27.7% of lead and 2.1% of bismuth) and 77 tons of slag (0.96% of lead and 0.09% of bismuth).
Lead smelting direct yield: 88.6 percent, direct bismuth smelting yield: 94.88 percent.
Example 5
Mixing 120 tons of raw materialsCharging raw materials (5% of water, 16.2% of lead, 1.9% of bismuth, 26.4% of iron, 16.2% of silicon dioxide and 13.1% of calcium oxide) which are pressed into blocks after being prepared into blocks are charged into a furnace, and the area of a charging area is 4m according to the charging speed of 5 tons per hour 2 The smelting furnace is filled with mixed air 4930Nm with oxygen content of 23 percent per hour 3 Biomass produced gas 850Nm 3 。
And (3) output: 17 tons of lead-bismuth alloy (containing 88.4% of lead and 10.2% of bismuth), 6 tons of smoke (containing 27.4% of lead and 0.8% of bismuth) and 84 tons of slag (containing 1.4% of lead and 0.46% of bismuth).
Lead smelting direct yield: 81.37%, direct yield of bismuth smelting: 79.72 percent.
The above-described series of detailed descriptions are merely specific to possible embodiments of the present invention, and they are not intended to limit the scope of the present invention, and various changes made without departing from the gist of the present invention within the knowledge of those skilled in the art are included in the scope of the present invention.
Claims (7)
1. A method for reducing and smelting lead, bismuth and the like by using biomass gas is characterized by comprising the following steps:
s1: preparing combustible gas: converting the biomass fuel into biomass fuel gas which is prepared to have the temperature of 120-250 ℃ and the heat value of 10-12MJ/m < 3 > and is used as combustible gas;
s2: reduction smelting: adding furnace-entering raw materials containing lead and bismuth into lead-bismuth reduction smelting equipment, introducing combustible gas obtained in the step S1 and combustion-supporting gas containing oxygen into the lead-bismuth reduction smelting equipment, combusting in the lead-bismuth reduction smelting equipment, and reducing the lead and bismuth to obtain lead-bismuth alloy; the flow of combustible gas is controlled to meet the amount of the reducing agent and the heat required by the smelting process, and the proportion of the combustion-supporting gas and the combustible gas is adjusted to control the oxidation-reduction atmosphere of reduction smelting;
s3: carrying out an electrolysis process on the lead-bismuth alloy obtained in the step S2 to obtain refined lead and bismuth anode mud, and refining the bismuth anode to obtain refined bismuth;
s4: collecting dust: collecting the smoke dust with larger gravity from the smoke gas in the S2 by a gravity dust collector, filtering the smoke dust with smaller gravity by a bag-type dust collector to obtain common smoke gas and lead and bismuth containing smoke dust, and sending the lead and bismuth containing smoke dust into reduction smelting equipment such as lead, bismuth and the like in the S2; the common flue gas is purified and discharged after reaching the standard.
2. The method for reducing and smelting lead, bismuth and the like by using the biomass gas as claimed in claim 1 is characterized in that the specific steps of the step S1 are as follows:
feeding biomass fuel with the heat value of 16-20MJ/kg into biomass gasification equipment, blowing air into the bottom of the biomass gasification equipment by a furnace bottom blower, fully combusting with carbon on an oxidation layer at the lowest part of a gasification furnace to generate carbon dioxide and a small amount of furnace slag, discharging the furnace slag from a furnace bottom slag discharge port, reacting the carbon dioxide with the carbon on a reduction layer from bottom to top to generate carbon monoxide, mixing the carbon monoxide with wood gas and water vapor generated on a dry distillation layer and a drying layer at the middle upper part of the gasification furnace to form biomass fuel gas, and conveying combustible gas to the reduction smelting furnace in S2 by a furnace top exhaust fan; the temperature of the combustible gas is adjusted through the blast volume at the bottom of the furnace and the air guiding volume at the top of the furnace, when the temperature is too high, the blast volume is reduced or the air guiding volume is increased at the same time, and when the temperature is too low, the blast volume is increased or the air guiding volume is reduced at the same time.
3. The method for the reduction smelting of lead, bismuth and the like by using the biomass gas as claimed in claim 2, wherein the biomass fuel comprises wood chips, sawn wood powder; the biomass gasification equipment is a biomass gasification furnace; the combustion-supporting gas is air.
4. The method for reduction smelting of lead, bismuth and the like by using biomass gas as claimed in claim 1, wherein in the step S3, the electrolyte of the electrolysis process contains Pb 2+ 70-130g/l,H 2 SiF 6 60-100g/l, and the conditions of the electrolysis process are as follows: current density of 130-180A/m 2 And the voltage is 0.4-0.5V.
5. The method for reduction smelting of lead, bismuth and the like by using biomass gas as claimed in claim 1, wherein in the step S2, 180-200 Nm/ton of raw material is fed 3 Burner, 1200-1300Nm 3 Premixing air, wherein the flow of the premixed air is 6-7 times of the flow of gas, controlling the temperature of an air zone of the reduction smelting furnace to be 1050-1150 ℃, increasing the flow of combustible gas when the temperature is too low, reducing the flow of the combustible gas when the temperature is too high, controlling the CO concentration of flue gas at the outlet of the reduction smelting furnace to be 0.015-0.025%, if the CO concentration is too high, increasing the flow of the premixed air, and if the CO concentration is too low, reducing the flow of the premixed air.
6. The method for reducing smelting of lead, bismuth and the like by using the biomass gas as claimed in claim 1, wherein in S2, the oxygen concentration in the combustion-supporting gas is 22% -24%.
7. The method for reducing and smelting lead, bismuth and the like by using the biomass gas as claimed in claim 1, wherein the components and the mixture ratio thereof of the raw materials to be fed into the furnace in the S2 are as follows by weight: 18-25 parts of lead, 2-5 parts of bismuth, 18-22 parts of iron, 12-15 parts of silicon dioxide and 8-12 parts of calcium oxide.
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1093411A (en) * | 1993-03-29 | 1994-10-12 | 英国氧气集团有限公司 | Metallurgical method and equipment |
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