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Method for joint production of sulfuric acid and refined iron powder by mixed burning of ferrous sulfate and pyrite

A technology of ferrous sulfate and pyrite, applied in chemical instruments and methods, sulfur compounds, inorganic chemistry, etc., can solve the problem of low comprehensive utilization rate of ferrous sulfate waste residue, and reduce the consumption of pyrite resources in sulfuric acid production , Alleviate the pressure of railway transportation and protect the ecological environment

Active Publication Date: 2012-06-20
CHINA PETROCHEMICAL CORP +1
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Problems solved by technology

[0008] The purpose of the present invention is to solve the problem that the comprehensive utilization rate of the existing ferrous sulfate waste slag is not high, and to provide a method for using ferrous sulfate to prepare sulfuric acid co-production iron fine powder

Method used

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  • Method for joint production of sulfuric acid and refined iron powder by mixed burning of ferrous sulfate and pyrite
  • Method for joint production of sulfuric acid and refined iron powder by mixed burning of ferrous sulfate and pyrite

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0030] The present invention is described below using examples, but the present invention is not limited to these examples. In these examples: process ferrous sulfate heptahydrate (dry basis) according to the method of the present invention and contain following shown components: w (FeSO 4 ·7H 2 O) 93.17%, w (MgSO 4 ·7H 2 O) 3.32%, w (MnSO 4 ·5H 2 O) 1.26%, w [Al 2 (SO 4 ) 3 18H 2 O]0.41%, w (CaSO 4 2H 2 O) 0.19%, w (TiOSO 4 ) 0.15%, other water-insoluble substances ( w ) 1.50%.

[0031] According to the spent acid that the method for the present invention handles concentrates and separates out ferrous sulfate monohydrate (dry base) contains the following components: w (FeSO 4 ) 42.93%, w [Fe 2 (SO 4 ) 3 ]3.81%, w (MgSO 4 ) 16.66%, w (MnSO 4 ) 2.85%, w [Al 2 (SO 4 ) 3 ]2.43%, w (CaSO 4 ) 0.84%, w (TiO 2 ) 0....

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Abstract

The invention discloses a method for joint production of sulfuric acid and refined iron powder by mixed burning of ferrous sulfate and pyrite and belongs to the technical field of environmental protection. The method comprises the following steps of: preparing ferrous sulfate monohydrate from ferrous sulfate heptahydrate by high-temperature crystal transformation, filtration and drying; drying and then feeding to drying equipment for free water removal together with ferrous sulfate monohydrate which is separated by concentrating waste acids from titanium dioxide production; drying and then feeding the mixture of ferrous sulfate monohydrate, pyrite and solid sulfur to a circulating fluid bed decomposition furnace; and introducing primary and secondary air for cyclic thermal decomposition. The high-temperature sulfur dioxide-containing flue gas discharged from the top of the circulating fluid bed decomposition furnace is subjected to cooling and dedusting treatment by a waste heat boiler, a cyclone dust collector and an electric dust collector and then fed into a dilute acid washing and purifying system and a double-transformation double-suction acid making system to produce sulfuric acid. The refined iron powder discharged from the circulating fluid bed decomposition furnace and the refined iron powder collected by the waste heat boiler, the cyclone dust collector and the electric dust collector, which have a thermal state w (Fe) of more than or equal to 60%, are cooled by a hot-material cooler and then fed into a refined iron powder bin. The method has good environmental and social benefits.

Description

technical field [0001] The invention belongs to the technical field of solid waste slag treatment and chemical production in environmental protection, and in particular relates to a method for producing sulfuric acid and co-producing iron fine powder by mixing ferrous sulfate with burning pyrite. Background technique [0002] Ferrous sulfate is a by-product in the production process of sulfuric acid titanium dioxide. According to the existing production process, 1 ton of titanium dioxide is produced as a by-product of 3-4 tons of ferrous sulfate heptahydrate, and 1 ton of titanium dioxide is produced as a by-product of waste acid concentration and precipitation of 1.0-1.4 tons of monohydrate. Ferrous sulfate. Ferrous sulfate heptahydrate was sold directly as a commodity in the past, but with the sharp increase in the production of titanium dioxide by sulfuric acid method (increased from 290,000 tons in 2000 to 1.474 million tons in 2010), the waste of ferrous sulfate heptahy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/74C22B1/02
CPCY02P20/129
Inventor 纪罗军黄新明素荣金苏闽胡小云王爱群
Owner CHINA PETROCHEMICAL CORP
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