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Method for comprehensively treatment of pyrite and desulphurized gypsum by utilizing coal and system thereof

A desulfurized gypsum, comprehensive treatment technology, applied in chemical instruments and methods, sulfur compounds, carbon compounds, etc., can solve the problems of single treatment quality, complex process system, high treatment temperature, and achieve a wide range of applications, low energy consumption, and treatment. large amount of effect

Inactive Publication Date: 2010-10-27
NANJING NORMAL UNIVERSITY
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the problems of complex process system, high processing temperature, single processing quality and long reaction time existing in the comprehensive utilization of desulfurized gypsum, and to provide a comprehensive treatment of pyrite and desulfurized gypsum based on thermochemical technology using coal. method and system

Method used

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  • Method for comprehensively treatment of pyrite and desulphurized gypsum by utilizing coal and system thereof
  • Method for comprehensively treatment of pyrite and desulphurized gypsum by utilizing coal and system thereof

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Embodiment 1

[0035] This embodiment consists of a fluidized bed pyrite decomposition device, a fluidized bed desulfurization gypsum reaction device, two reduction reaction decomposition devices and their corresponding auxiliary systems. figure 1 A schematic diagram of the system structure and process flow of this embodiment is given.

[0036] After the coal is pulverized by the coal mill 1, it is stored in the pulverized coal bin 2, and then the pulverized coal is sent to the fluidized bed pyrite decomposition device 5 through the feeding device 201; 2 Store in the pyrite bin 4 after being pulverized by the pyrite grinding machine 3, and then feed the FeS by the feeding device 401 2 The powder is sent into the fluidized bed pyrite decomposition device 5. The starting combustion chamber 6 (for starting the fluidized bed), the high-temperature non-mechanical valve 7 (for conveying high-temperature solid materials) and the slagging device 8 (for discharge solid ash). Coal, FeS 2 , and CaO...

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Abstract

The invention discloses a method for comprehensively treatment of pyrite and desulphurized gypsum by utilizing coal and a system thereof. Coal and CO produced by the same are taken as reducing agents, the pyrite is directly reduced into reduced ferrum Fe and simple substance sulphur S, the desulphurized gypsum is reduced and decomposed into lime CaO and SO2, SO2 is used for preparing sulphuric acid or simple substance sulphur, and the lime CaO can be returned to a desulphurization system to be used as desulphurizing agent or ferrous metallurgy auxiliary material, thus sulphur and ferrum resources are recycled. The system is composed of a fluidized bed pyrite decomposing device, a fluidized bed desulphurized gypsum reaction device, a pyrite feeding device, a coal feeding device, a CO rapid cooling device, a high temperature non-mechanical valve, a desulphurized gypsum drying and feeding device, an ash cooling device, a Fe / CaO collecting and sorting device, a CaO returning device, a combustion starting chamber, a CO combustion device, a CO2 / SO2 cooling and sulphuric acid producing device, a CO2 storage tank, a fan and pipelines.

Description

technical field [0001] The invention relates to a method and system for comprehensively treating pyrite and desulfurized gypsum by using coal, belonging to the technical field of solid waste treatment. technical background [0002] The extensive use of coal-based fossil energy has brought serious environmental pollution, such as the emission of SO from coal-fired power stations 2 , NO x , CO 2 and heavy metals, causing a series of environmental problems such as acid rain and global climate change. Currently, calcium-based absorbents (CaO, Ca(OH) 2 , CaCO 3 )-based dry / wet flue gas desulfurization technology (Flue Gas Desulphurization) has become the mainstream desulfurization technology for large-scale application in the world. The main components of desulfurization ash are CaSO 3 ,, CaO(OH) 2 , CaCO 3 , fly ash, etc., due to their complex composition, large fluctuations, and impurities such as phosphorus, fluorine, and heavy metals, most of them are disposed of by t...

Claims

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Application Information

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IPC IPC(8): C01F11/04C01B31/20C01B17/50C21B13/10C01B32/50
CPCY02A50/20Y02P10/122Y02P10/20
Inventor 王宽王习钦朱婷曹乾王晓楠杭程卢平
Owner NANJING NORMAL UNIVERSITY
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