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Method for preparing sulfuric acid by utilizing enriched flue gas through high-temperature desulphurization of electrolytic manganese residue

An electrolytic manganese slag, high temperature technology, applied in chemical instruments and methods, sulfur compounds, inorganic chemistry, etc., can solve the problems of land resource consumption, access, increase in production costs, etc., and achieve the effect of reducing environmental pollution

Active Publication Date: 2016-01-06
湘西蒙成科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For every ton of electrolytic manganese powder produced, about 7-8 tons of acid leaching waste with fine particles and a certain amount of harmful elements are discharged. On the one hand, these acid leaching wastes increase the cost of land requisition and site disposal for enterprises to pile up waste. It will increase the production cost of enterprises and consume a lot of land resources; on the other hand, long-term storage of waste residue will cause some harmful elements to penetrate through the soil layer and enter the surface and groundwater, affecting groundwater resources and seriously polluting the environment

Method used

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  • Method for preparing sulfuric acid by utilizing enriched flue gas through high-temperature desulphurization of electrolytic manganese residue
  • Method for preparing sulfuric acid by utilizing enriched flue gas through high-temperature desulphurization of electrolytic manganese residue

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) Dry 90.0 parts of electrolytic manganese slag at 350°C, add 5.0 parts of activator A and 5.0 parts of activator B, grind and stir to make it uniform;

[0042] (2) Feed the product obtained in step (1) into a rotary kiln, heat up to 700°C-1350°C for calcination, and control the residence time of the material in the kiln to 75-120min;

[0043] (3) After the sulfur dioxide gas produced at the kiln tail passes through the settling chamber and the special electric precipitator to remove dust, the temperature of the flue gas is 200°C-300°C, and the concentration of sulfur dioxide in the flue gas is 5.5-7.5%;

[0044] (4) The high-temperature furnace gas from the electrostatic precipitator enters the re-nozzle scrubber, contacts with 10% dilute sulfuric acid, and is washed by adiabatic evaporation. The temperature of the furnace gas is lowered from about 300°C to 65°C, and then the furnace gas enters the packed scrubber. It is washed by circulating dilute acid in the washi...

Embodiment 2

[0049] (1) Dry 90.0 parts of electrolytic manganese slag at 350°C, add 10.0 parts of activator A, grind and stir to make it uniform;

[0050] (2) Feed the product obtained in step (1) into a rotary kiln, heat up to 700°C-1350°C for calcination, and control the residence time of the material in the kiln to 75-120min;

[0051] (3) After the sulfur dioxide gas produced at the kiln tail passes through the settling chamber and the special electric precipitator to remove dust, the temperature of the flue gas is 200°C-300°C, and the concentration of sulfur dioxide in the flue gas is 5.5-7.5%;

[0052] (4) The high-temperature furnace gas from the electrostatic precipitator enters the re-nozzle scrubber, contacts with ~10% dilute sulfuric acid, and is washed by adiabatic evaporation. The temperature of the furnace gas is lowered from about 300°C to ~65°C, and then the furnace gas enters the packing for washing The tower is washed by the washing tower with circulating dilute acid to fu...

Embodiment 3

[0057] (1) Dry 90.0 parts of electrolytic manganese slag at 350°C, add 10.0 parts of activator B, grind and stir to make it uniform;

[0058] (2) Feed the product obtained in step (1) into a rotary kiln, heat up to 700°C-1350°C for calcination, and control the residence time of the material in the kiln to 75-120min;

[0059] (3) After the sulfur dioxide gas produced at the kiln tail passes through the settling chamber and the special electric precipitator to remove dust, the temperature of the flue gas is 200°C-300°C, and the concentration of sulfur dioxide in the flue gas is 5.5-7.5%;

[0060] (4) The high-temperature furnace gas from the electrostatic precipitator enters the re-nozzle scrubber, contacts with ~10% dilute sulfuric acid, and is washed by adiabatic evaporation. The temperature of the furnace gas is lowered from about 300°C to ~65°C, and then the furnace gas enters the packing for washing The tower is washed by the washing tower with circulating dilute acid to fu...

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Abstract

The invention discloses a method for preparing sulfuric acid by utilizing enriched flue gas through high-temperature desulphurization of an electrolytic manganese residue. The method comprises: adding an activating agent and a reducing agent according to a certain ratio into the electrolytic manganese residue; performing uniform grinding; and feeding the obtained product to a rotary kiln after metering for high-temperature calcination desulphurization. The desulphurization rate of the acid leaching residue can be improved to more than 85%; the concentration of SO2 in the enriched flue gas can be improved to more than 5.5%; and an acid preparation process by means of one conversion and one absorption is adopted to produce 93% or 98% of industrial sulfuric acid. According to the method, the electrolytic manganese residue is utilized to prepare sulfuric acid; reuse of waste resource is realized, that is, the electrolytic manganese residue is recycled; and environmental pollution is reduced. The method has a wide industrial application.

Description

technical field [0001] The invention relates to a method for preparing sulfuric acid by using electrolytic manganese slag, in particular to a method for preparing sulfuric acid by using electrolytic manganese slag to desulfurize and enrich flue gas at high temperature. Background technique [0002] Electrolytic manganese slag is to add sulfuric acid solution to manganese carbonate ore powder to electrolyze to produce manganese dioxide filter residue. The production process is to add sulfuric acid solution and manganese carbonate ore powder to react in the reactor to generate manganese sulfate. A small amount of iron sulfide ore powder is used as a reducing agent to oxidize Fe2+ into Fe3+ in the solution, and hydrolyze to form Fe(OH))3 precipitate, then neutralize the excess acid with lime milk, when the pH value is close to 7, add SDD to saturate solution, so that the heavy metal ions in the solution generate corresponding sulfide precipitates, and then filter with a filter ...

Claims

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Application Information

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IPC IPC(8): C01B17/74
Inventor 石朝军邵万库魏英庆谢勇雷崇刚于江石成勇
Owner 湘西蒙成科技有限责任公司
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