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Application of secondary air to process for reducing pyrolusite and producing sulfuric acid in fluidized bed furnace

A boiling furnace, pyrolusite technology, applied in manganese sulfate, sulfur compounds, inorganic chemistry, etc., can solve the problems of poor operating conditions, environmental pollution, and high equipment maintenance costs

Inactive Publication Date: 2012-01-18
湖南省泸溪县金旭冶化有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method also produces SO 2 and dust, pollute the environment, labor-intensive
[0006] The above-mentioned pyrolusite roasting and reduction process requires pulverized coal as a reducing agent, and the production process requires high energy consumption, long process, and produces a large amount of CO 2 , CO and SO 2 Exhaust gas and dust, poor operating conditions, serious environmental pollution
[0007] In addition, the Chinese patent whose publication number is CN101837959A introduces a new method of utilizing sulfur to reduce pyrolusite to co-produce sulfuric acid in a fluidized fluidized furnace. Combusting sulfur as a heat source and reducing agent provides the temperature required for manganese dioxide reduction, which greatly saves fuel and does not require will emit CO 2 and CO waste gas, but the reduced furnace gas contains more sublimated sulfur, which can easily cause blockage of purification equipment and pipelines, affect normal production, and cause high equipment maintenance costs; in addition, the tail gas still contains a small amount of SO 2 , easily pollute the environment
[0008] Although the upper part of the fluidized fluidized furnace is equipped with a supplementary air device, because in the production process of reducing manganese dioxide, the fluidized fluidized furnace is the main body of the reduction reaction, and the reaction is carried out in a reducing atmosphere with weak oxygen, and the temperature is relatively high, and the fine ore particles are brought to the furnace. Too much in the upper part, mainly due to the redox reaction between sulfur and manganese dioxide, the sulfur cannot be removed completely in the reducing atmosphere of weak oxygen (reaction of sulfur and oxygen), and the relative movement between it and the airflow in the upper part of the fluidized fluidized furnace is reduced, The driving force of the reaction (desulfurization) decreases, and the desulfurization efficiency is greatly reduced, so sublimed sulfur is bound to be produced
In the production process of acid production, sublimated sulfur is not allowed to be brought into the purification section, the temperature of the purification section is low, and the solidification of sublimated sulfur will cause problems such as blockage of purification equipment and pipelines.

Method used

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  • Application of secondary air to process for reducing pyrolusite and producing sulfuric acid in fluidized bed furnace
  • Application of secondary air to process for reducing pyrolusite and producing sulfuric acid in fluidized bed furnace
  • Application of secondary air to process for reducing pyrolusite and producing sulfuric acid in fluidized bed furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Mix 500kg of sulfur and 250kg of pyrolusite (proportion 1:0.5) into the fluidized fluidized furnace, and blow air into the lower part of the fluidized fluidized furnace to make the material boil and burn in the fluidized fluidized furnace under the action of the furnace bottom airflow and the negative pressure on the furnace top. , control the temperature of the boiling layer at about 850-950°C, control the oxygen content in the lower section of the fluidized furnace at about 10%, and burn the sulfur mixed in the pyrolusite to generate sulfur dioxide, which generates a lot of heat, and reduces the manganese dioxide in the pyrolusite to manganese monoxide . The manganese monoxide discharged from the outlet of the fluidized bed furnace falls into the water to isolate the air for cooling to prevent the manganese monoxide from being oxidized into manganese dioxide, and the manganese monoxide can also be directly discharged into the sulfuric acid solution (or electrolytic man...

Embodiment 2

[0037] Embodiment 2: no longer narrate with the similarity of embodiment 1, difference is:

[0038] Mix 400kg of sulfur and 800kg of pyrolusite (in a ratio of 1:2) into the fluidized furnace, control the temperature of the fluidized layer at 850-1000°C, and the outlet temperature of the fluidized furnace at 600-800°C. 6 branch pipes Φ89×4 are evenly distributed into the furnace in 6 directions, and the secondary air volume is controlled at 21m 3 / min, so that most of the sublimated sulfur is completely converted into sulfur dioxide, and the furnace gas is sent to the purification process after dedusting. The sulfur dioxide is catalyzed by the catalyst to form sulfur trioxide, which reacts with water to produce sulfuric acid. The amount of sulfuric acid produced is 1180kg, the utilization rate of sulfur is over 95%, and the output of manganese monoxide is 454kg. The results are shown in Table 1.

Embodiment 3

[0039] Embodiment 3: no longer narrate with the similarity of embodiment 1, difference is:

[0040] Mix 400kg of sulfur and 1600kg of pyrolusite (proportion 1:4) into the fluidized furnace, control the temperature of the fluidized layer to 7500-1000°C, and the outlet temperature of the fluidized furnace to 700-900°C. 6 branch pipes Φ89×4 are evenly distributed into the furnace in 6 directions, and the secondary air volume is controlled at 22m 3 / min, so that most of the sublimated sulfur is completely converted into sulfur dioxide, and the furnace gas is sent to the purification process after dedusting. The sulfur dioxide is catalyzed by the catalyst to form sulfur trioxide, which reacts with water to produce sulfuric acid. The amount of sulfuric acid produced is 1140kg, the utilization rate of sulfur is over 93%, and the output of manganese monoxide is 915kg. The results are shown in Table 1.

[0041] Table 1

[0042] sulfur

pyrolusite

Secondary air volume ...

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Abstract

The invention provides application of secondary air to a process for reducing pyrolusite and producing sulfuric acid in a fluidized bed furnace and belongs to the field of deep processing of minerals. When the temperature of sulfur in the fluidized bed furnace is high, sublimed sulfur is generated; in the acid production process, the sublimed sulfur enters the purification working section to block purification equipment and pipelines; and the sublimed sulfur is combusted completely by a measure of supplementing the secondary air at the expanding section of the fluidized bed furnace and a method for controlling the quantity of the secondary air, so the yield of the sulfuric acid can be increased, blockage of the purification equipment and pipelines caused by the sublimed sulfur of the sulfur can be avoided, and environmental pollution caused by treatment of the pyrolusite can be reduced. The method is simple and easy to operate.

Description

technical field [0001] The invention relates to a method for using secondary air to reduce pyrolusite and co-produce sulfuric acid in a fluidized fluidized furnace, which greatly improves the utilization efficiency of sulfur to increase the output of sulfuric acid and manganese sulfate, and belongs to the field of deep processing of mineral products. Background technique [0002] Manganese sulfate is an important basic chemical raw material, which is widely used in chemical fields such as medicine, papermaking, catalyst, feed additives, metallurgical fields such as the production of electrolytic manganese, and the production of other manganese salts. With the increasing use of manganese products in the world and abroad, its production capacity is expanding rapidly. As far as our country is concerned, the development of electrolytic manganese is very rapid, and the production capacity has reached more than 2.3 million tons per year. Many manganese products such as manganese s...

Claims

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Application Information

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IPC IPC(8): C01G45/10C01B17/74
Inventor 姚茂君
Owner 湖南省泸溪县金旭冶化有限责任公司