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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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the energy required to heat the cracking furnace with

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

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[0016] Example 1: The roasting furnace is heated by external heat. When the temperature reaches 400°C or higher, the pyrite is sent to the roasting furnace for combustion. When the temperature reaches 850-1000°C, the alkylated waste sulfuric acid is sent through an acid pump Roaster, and keep the temperature at 850~1000℃, waste sulfuric acid is cracked at this high temperature to produce SO 2 Gas, the organic matter in it is also incinerated into CO 2 , The mixed gas and SO produced by the combustion of pyrite 2 The gas forms furnace gas together, and then the obtained furnace gas is purified and refined, that is, cooled, washed, defogged and dried to obtain qualified SO 2 The furnace gas is transformed and absorbed to obtain qualified sulfuric acid.

Example Embodiment

[0017] Example 2: The roasting furnace is heated by external heat. When the temperature reaches 400°C or higher, the pyrite mixed with the combustion-supporting waste sulfur is sent to the roasting furnace for combustion. When the temperature reaches 900-1100°C, the alkylated waste Sulfuric acid is sent to the roasting furnace through an acid pump, and the temperature is controlled to keep it at 900~1100℃ by adjusting the amount of waste sulfur added. The waste sulfuric acid is cracked at this high temperature to produce SO 2 Gas, the organic matter in it is also incinerated into CO 2 , SO produced by the combustion of the mixed gas with pyrite and waste sulfuric acid 2 The gas forms furnace gas together, and then the obtained furnace gas is purified and refined, that is, cooled, washed, defogged and dried to obtain qualified SO 2 The furnace gas is transformed and absorbed to obtain qualified sulfuric acid.

Example Embodiment

[0018] Example 3: The roasting furnace is heated by external heat. When the temperature reaches 400℃ or higher, the pyrite is sent to the roasting furnace for combustion. When the temperature reaches 900~1000℃, the alkylated waste sulfuric acid is sent into the furnace through an acid pump. Roaster, 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, the temperature is controlled to keep it at 900-1000°C. Waste sulfuric acid Cracking at this high temperature to produce SO 2 Gas, the organic matter in it is also incinerated into CO 2 , The mixed gas and SO produced by the combustion of pyrite 2 The gas forms the furnace gas together. A cracking furnace is added to the gas pipeline at the outlet of the roasting furnace of the pyrite sulphuric acid plant. The temperature of the furnace gas is used to increase the temperature of the cracking furnace to 900℃ ...

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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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