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Process for processing waste sulfuric acid by virtue of pyrite acid-making roasting furnace

A roasting furnace and pyrite technology, applied in the direction of sulfur compounds, inorganic chemistry, non-metallic elements, etc., can solve the problems of waste of resources, high energy required for heating, etc., to reduce cracking costs, improve the overall efficiency of the enterprise, and reduce losses Effect

Inactive Publication Date: 2016-04-20
李勇
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the energy required to heat the cracking furnace with fuel gas is high, resulting in waste of resources in the process

Method used

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  • Process for processing waste sulfuric acid by virtue of pyrite acid-making roasting furnace

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Effect test

Embodiment 1

[0016] Example 1: Heat the roaster with external heat, send the pyrite into the roaster for combustion when the temperature reaches above 400°C, and send the alkylated waste sulfuric acid through the acid pump when the temperature reaches 850-1000°C Roasting furnace, and control the temperature to maintain at 850-1000°C, waste sulfuric acid is cracked at this high temperature to produce SO 2 gas, the organic matter in which is simultaneously incinerated into CO 2 , the mixed gas and the SO produced by pyrite combustion 2 The gases form the furnace gas together, and then the obtained furnace gas is purified and refined, that is, cooled, washed, demisted and dried to obtain qualified SO 2 Furnace gas, the furnace gas is transformed and absorbed to produce qualified sulfuric acid.

Embodiment 2

[0017] Example 2: Heat the roasting furnace with external heat. When the temperature reaches above 400°C, send the pyrite mixed with waste sulfur as a combustion accelerant into the roasting furnace for combustion. When the temperature reaches 900-1100°C, the alkylation waste Sulfuric acid is sent into the roaster through an acid pump, and the temperature is controlled by adjusting the amount of waste sulfur added to keep it at 900-1100°C. At this high temperature, the waste sulfuric acid is cracked to produce SO 2 gas, the organic matter in which is simultaneously incinerated into CO 2 , the mixed gas and SO produced by burning pyrite and waste sulfuric acid 2 The gases form the furnace gas together, and then the obtained furnace gas is purified and refined, that is, cooled, washed, demisted and dried to obtain qualified SO 2 Furnace gas, the furnace gas is transformed and absorbed to produce qualified sulfuric acid.

Embodiment 3

[0018] Embodiment 3: heating the roaster by external heat, when the temperature reaches above 400°C, the pyrite is sent into the roaster for combustion, and when the temperature reaches 900-1000°C, the alkylation waste sulfuric acid is sent into Roasting furnace, and by adjusting one or more of the amount of pyrite ore, the sulfur content in the ore, the amount of waste sulfuric acid added, and the cooling area of ​​the cooling water tank to control the temperature to keep it at 900-1000 ° C, the waste sulfuric acid Cracked at this high temperature to produce SO 2 gas, the organic matter in which is simultaneously incinerated into CO 2 , the mixed gas and the SO produced by pyrite combustion 2 The gas forms furnace gas together, and a cracking furnace is added to the furnace gas pipeline at the outlet of the roasting furnace of the pyrite acid plant, and when the temperature of the furnace gas is used to raise the temperature of the cracking furnace to above 900°C, waste sulf...

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Abstract

The invention relates to a process for processing waste sulfuric acid by virtue of a pyrite acid-making roasting furnace. The process comprises the following steps: heating the roasting furnace by virtue of external heat, adding pyrite into the roasting furnace to burn when the temperature reaches above 400 DEG C, adding alkylated waste sulfuric acid into the roasting furnace through an acid pump when the temperature reaches 850-1100 DEG C, maintaining the temperature at 850-1100 DEG C until the waste sulfuric acid cracks to produce SO2 gas at the high temperature, wherein organic matters are simultaneously burnt into CO2, and mixed gas and SO2 gas produced during the burning of the pyrite form furnace gas; cooling, washing, demisting and drying the furnace gas, so as to produce qualified SO2 furnace gas, and converting and absorbing the furnace gas, so as to obtain qualified sulfuric acid. According to the process, the cracking of waste sulfuric acid is realized by virtue of heat of materials on a boiling layer of the pyrite acid-making roasting furnace, and natural gas does not need to be used as a heating source, so that the cracking cost is greatly lowered; and by taking waste sulfur produced by peripheral factories as a combustion improver, the cracking capacity is improved.

Description

technical field [0001] The invention relates to the field of waste sulfuric acid treatment, in particular to a process for treating waste sulfuric acid using a pyrite acid roasting furnace. Background technique [0002] At present, the low-concentration sulfuric acid produced in the production process of the petrochemical industry generally has the problem of being difficult to recycle. In particular, the sulfuric acid alkylation unit of my country's petrochemical refineries produces 80-100kg of sulfuric acid per ton of hydrocarbonized oil. It is 85-90% low-concentration sulfuric acid, and its composition contains about 5% organic matter and about 10% water in addition to sulfuric acid. The low-concentration sulfuric acid is a colloidal liquid with high viscosity, its color is black and red, its property is unstable, and it emits a special odor, which is difficult to handle. However, with the urgent need to upgrade the quality of gasoline, the alkylation unit not only needs ...

Claims

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Application Information

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IPC IPC(8): C01B17/74
CPCC01B17/74
Inventor 李勇
Owner 李勇
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