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Method for manufacturing iron oxide with waste slag containing iron

A technology of iron oxide and waste residue, applied in the field of iron oxide, can solve the problems of difficulty in filtering and washing of hydrothermal products, and achieve the effects of being beneficial to cost, simple process and low temperature

Inactive Publication Date: 2008-01-23
CENT SOUTH UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the defects of the above-mentioned methods, the present invention utilizes the pickling solution obtained by reacting iron-containing waste residue with sulfuric acid to react with ammonia water, and then adopts the hydrothermal method to prepare iron oxide. Problems such as washing difficulties

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  • Method for manufacturing iron oxide with waste slag containing iron

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Embodiment 1

[0019] Embodiment 1: get pyrite slag 3000g, wherein slag contains Fe 2 o 3 : 74.1%, Fe 3 o 4 : 15.96%. Add 7740ml of 50% sulfuric acid in a 10L three-necked bottle, start stirring, and slowly add the above-mentioned slag. Control the reaction temperature to 115°C. After reacting for 4 hours, add an appropriate amount of water, and filter the obtained pickling solution while it is hot.

[0020] Take 10L pickling solution, adjust Fe in the pickling solution 3+ The concentration is 3.0mol / L, Fe 2+ / Fe 3 The molar ratio of the substances is 0.145, the adjusted pickling solution is added to the autoclave, 7200mL of ammonia water is added, and the pH of the reaction solution is controlled to be 7.0. Heating to 190°C and reacting for 2 hours, cooling, filtering, washing, and drying to obtain the crude iron oxide product. The crude iron oxide product was calcined at 800°C for 2 hours to obtain the iron oxide product, and the quality of the iron oxide product is shown in Table ...

Embodiment 2

[0026] Embodiment 2: get pyrite slag 300Kg, wherein slag contains Fe 2 o 3 : 74.1%, Fe 3 o 4 : 15.96%. at 1m 3 Add 50% sulfuric acid 0.774m to the enamel reaction kettle 3 , start stirring, and slowly add the above-mentioned slag. The reaction temperature is controlled to be 110° C., and after 4 hours of reaction, an appropriate amount of water is added, and the obtained pickling solution is filtered while it is hot.

[0027] Take 1m 3 Pickling solution, adjust Fe in the pickling solution 3+ The concentration is 3.2mol / L, Fe 2+ / Fe 3 The molar ratio of the substances is 0, and the adjusted acid leaching solution is added to the high-pressure reactor, and 0.72m 3 Ammonia, and control the pH of the reaction solution to be 7.5. Heating to 300°C for 2 hours, cooling, filtering, washing, and drying to obtain crude iron oxide. The crude iron oxide product was calcined at 800°C for 2 hours to obtain the iron oxide product, and the quality of the iron oxide product is show...

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Abstract

A method that the ferriferous residue prepares the ferric oxide. The pyrite cinder reacts with the sulfuric acid to gain the pickle liquor. The pickle liquor reacts with the ammonia or ammonia liquid. The amount ratio of the substance between Fe2+ and Fe3+ in the pickle liquor is 0 to 2, the pH value of the reaction solution is 3 to 14, the hydrothermal temperature is 100 DEG C. to 350 DEG C. and the reaction time is 0.5 hour to 24 hours. The filter cake is washed and dried to gain the crude product ferric oxide and the ferric oxide crude product is calcined under 300 DEG C. to 1000 DEG C. to gain the ferric oxide. The ammonium sulfate filtrate is evaporated, condensed and crystallized to gain the solid ammonium sulfate. The invention adopts the ferriferous residue to prepare the ferric oxide with environmental benefit and economic benefit and adopts the pickle liquor gained by the ferriferous residue with simple process and low temperature of synthesizing the ferric oxide, which lowers the cost of the ferric oxide and solves the difficult problem that the colloidal substance produced before is difficult to filter and wash.

Description

technical field [0001] The invention relates to a method for iron oxide, in particular to a method for preparing iron oxide by using ferric iron-containing waste residue as a raw material and simultaneously producing ammonium sulfate as a by-product. Background technique [0002] Iron oxide is an inorganic non-metallic material, which is widely used in magnetic materials, pigments, polishing agents, ferrites and catalysts. Iron oxide is used as iron red pigment because of its non-toxic, cheap and other advantages, so it is widely used in the field of pigments. In the field of magnetic materials, iron oxide is used to prepare high-performance soft ferrite, permanent ferrite, rare earth bonded permanent magnet, high-density magnetic recording medium and magneto-optical storage materials. [0003] The production methods of iron oxide are generally divided into dry method and wet method. The dry process mainly includes green vitriol calcination method, iron yellow calcination ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/06C01C1/24
Inventor 郑雅杰刘兴瑜符丽纯占寿祥黄国庆
Owner CENT SOUTH UNIV
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