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A system and method for producing sulfur and iron oxide from pyrite

A technology of iron oxide and pyrite, applied in the preparation/purification of iron oxide, iron oxide/iron hydroxide, sulfur, etc., can solve the problems of high cost and stop use of sulfur, achieve low production cost and eliminate pollution problems , the effect of strong implementability

Active Publication Date: 2017-03-22
刘慧南
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The use of pyrite to produce sulfur appeared in China before the 1980s, mainly using pyrite and coal to obtain sulfur under oxygen-poor conditions, and the utilization rate of sulfur generally does not exceed 70%. Therefore, it has caused extremely serious environmental problems. , so the process of producing sulfur from pyrite is basically out of service
There is a patent in China that uses a two-step method to produce sulfur, first oxidizing the sulfur in pyrite to sulfur dioxide, and then reducing it with coal, but it has not been used in production because of its high cost
So far, there is no low-cost, economical and environmentally friendly technical solution to use pyrite to produce sulfur and iron oxide

Method used

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  • A system and method for producing sulfur and iron oxide from pyrite
  • A system and method for producing sulfur and iron oxide from pyrite
  • A system and method for producing sulfur and iron oxide from pyrite

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Embodiment 1

[0041] This embodiment provides a system for producing sulfur and iron oxide from pyrite, which includes: primary desulfurization equipment, oxidation equipment and secondary desulfurization equipment;

[0042] Among them, such as figure 1 As shown, the primary desulfurization equipment includes a closed desulfurization furnace 3, a waste heat utilization device 5, a waste heat power generation device 6, a dust removal device 7 and a sulfur recovery device 8; the lower part of the closed desulfurization furnace 3 is connected to the opposite side. The feed hopper 1 and the discharge hopper 4, the closed desulfurization furnace 3 is provided with a heat supply device 2, and the bottom of the furnace body of the closed desulfurization furnace 3 is provided with an air inlet pipe 9; One interface is connected to the upper part of the furnace body of the closed desulfurization furnace 3 through a pipeline, and the second interface of the waste heat utilization device 5 is connecte...

Embodiment 2

[0048] The present embodiment provides a kind of method that utilizes pyrite to manufacture sulfur and iron oxide, and it is the method that adopts the system of embodiment 1 to utilize pyrite to manufacture sulfur and iron oxide, and the method comprises the following steps:

[0049] Step (1): Pyrite is delivered to the feed hopper 1 of the closed desulfurization furnace 3 of the primary desulfurization equipment and carried out in the feed hopper 1 (conventional methods can be used, such as feeding nitrogen and / or nitrogen into the feed hopper 1 or water vapor, etc.), and then sent to the closed desulfurization furnace 3, and at the same time pass the non-oxidizing gas into the closed desulfurization furnace 3 through the air inlet pipe 9, and use the heat supply device 2 to make The temperature in the closed desulfurization furnace 3 reaches 445-1000°C (preferably 600-700°C), so that pyrite is desulfurized to be decomposed into ferrous sulfide and elemental sulfur; The reac...

Embodiment 3

[0055] In this embodiment, the system of Embodiment 1 and the method of Embodiment 2 are used to produce sulfur and iron oxide from granular pyrite. The particle size of the granular pyrite is about 3.0 mm.

[0056] In step (1), the closed desulfurization furnace in the primary desulfurization equipment used is a fluidized roaster, and the method for deoxidizing pyrite in the feed hopper is to feed nitrogen and / or water into the feed hopper steam, the non-oxidizing gas is nitrogen, and the consumption of the non-oxidizing gas is 5-50m 3 / second, the temperature in the closed desulfurization furnace during desulfurization treatment is 600-700°C, and the temperature of the non-oxidizing medium gas with elemental sulfur after being cooled by the waste heat utilization device and the waste heat power generation device is 450-480°C, The non-oxidizing gas discharged from the sulfur recovery unit enters the waste heat utilization unit and reaches 540-560°C after being heated. The ...

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Abstract

Provided are a system and method for manufacturing sulphur and iron oxide from pyrite. The system comprises a primary desulphurisation apparatus, an oxidation apparatus and a secondary desulphurisation apparatus, wherein the primary desulphurisation apparatus comprises a closed desulphurisation furnace (3), a waste heat utilisation device (5), a waste heat power generation device (6), a dust collection device (7), a sulphur recovery device (8), etc.; the oxidation apparatus comprises an oxidation furnace (11), the dust collection device (7), a safety pipe (13), a water tank (14), etc.; and the secondary desulphurisation device comprises the closed desulphurisation furnace (3), the dust collection device (7), the sulphur recovery device (8), etc. The method comprises: performing desulphurisation on pyrite using the primary desulphurisation apparatus to obtain ferrous sulphide and sulphur; performing oxidation on the ferrous sulphide using the oxidation apparatus to obtain a mixture of ferric oxide and elemental sulphur; and performing a secondary desulphurisation on the mixture of ferric oxide and elemental sulphur using the secondary desulphurisation apparatus to obtain ferric oxide and sulphur. Directly manufacturing sulphur and ferric oxide from pyrite has the advantages of having a low production process cost, being environmentally friendly, having a high sulphur utilisation rate, etc.

Description

technical field [0001] The invention relates to a system and method for producing sulfur and iron oxide from pyrite, belonging to the technical field of pyrite smelting in the field of metallurgy. Background technique [0002] Pyrite exists widely on the earth, and there are many mines in the world that produce it. There are not only mines that produce pyrite alone, but also many non-ferrous mines that produce pyrite as a by-product. Some coal mines also contain a certain amount of pyrite. [0003] The ores of many non-ferrous mines in the world contain a certain amount of pyrite, but due to the low value of pyrite, most of them cannot be recycled and are directly discharged into tailings. Since pyrite will gradually oxidize over time, it will cause serious environmental pollution. In China, pyrite is mostly used to produce sulfuric acid. However, compared with producing sulfuric acid from pyrite, the production of sulfuric acid from sulfur requires less project investme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B17/06C01G49/06
CPCC01B17/06C01G49/06Y02P20/10Y02P20/129
Inventor 刘慧南
Owner 刘慧南