Process for preparing ferric oxide red powder

An iron oxide and red powder technology, applied in fibrous fillers and other directions, can solve the problems of inability to enter the mid-to-high-end market, insufficient utilization of ferrous sulfate by-products, and excessive manganese content. It is suitable for large-scale industrial production and easy to control. , the effect of reducing production costs

Inactive Publication Date: 2004-04-28
FUDAN UNIV +1
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Problems solved by technology

Chinese patent ZL89105940.7 and CN1297006 have reported the method that ferrous sulfate is converted into ferrous carbonate to produce high-purity iron oxide red powder, but the high-purity iron oxide red powder at that time can only be counted as medium in the raw material market of magnetic materials. Low-end products
A large number of ferrous sulfate by-products cannot be fully utilized. Although the content of other impurities in the iron oxide red powder prepared from it can be reduced, due to the excessive manganese content, its products can only be classified as low-grade soft magnetic iron oxide red powder , unable to enter the middle and high-end market

Method used

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  • Process for preparing ferric oxide red powder

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Effect test

Embodiment 1

[0020] Put 1.9kg of industrial ferrous sulfate into a 5L beaker equipped with a mechanical stirrer, add deionized water to 4.0L, and add 30g of iron sheet to consume free acid in the raw materials. Maintained at 80-90°C and stirred for 4 hours. After removing the residual iron sheet, add 0.8g of sodium sulfide, 50mL of 4.3% ammonia water under the condition of pH=5, blow in air for 30 minutes, keep warm for 0.5 hours, add 30mL of 4.3% ammonia water, add 0.1g of polyacrylamide, and continue to keep warm After 4 hours let stand overnight. The filtrate was filtered through a 0.7 μ filter membrane to obtain a clear and transparent green filtrate. After analysis of the filtrate, Fe57.24g / L, Mn676mg / L, Si<0.5mg / L, Al<0.1mg / L, Ca2.6mg / L. Yield 78.5%.

Embodiment 2

[0022] Xiangyi 3M 3 Inject 1.5M into the reactor 3 Put 900kg of industrial ferrous sulfate into deionized water, add 1.5kg of sodium sulfide and 250 liters of 4.4% ammonia water under stirring, heat up to 80-90°C at the same time, blow in air for 30 minutes, add 60g of polyacrylamide, and keep warm for 5 After hours let stand overnight. The supernatant was filtered through a 0.5μ microporous filter to obtain a clear and transparent green filtrate 2.0M 3 . After analysis of the filtrate, Fe67.9g / L, Mn660mg / L, Si1.3mg / L, Al0.35mg / L, Ca6.2mg / L, Mg285mg / L. Yield 85%.

Embodiment 3

[0024] Fe 2 o 3 (%)

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Abstract

The present invention relates to the preparation process of ferric oxide red powder. Unlike available technology, which has the demerits of high production cost and low product purity of processed ferrous permanganate, the present invention uses ferrous sulfate as the side product of titanium white powder production as material and produces high purity ferric oxide red powder via purification to eliminate impurity, precipitation to eliminate manganese, water washing, spray burning and other steps. The ferric oxide red powder has impurity content of Si, Al, Ca, Mg, etc. less than 80 ppm, Mn content lower than 0.2 wt% and Fe2O3 content over 99.5 wt%, and is used as soft magnetic material. The present invention has simple technological process, low production cost and high product quality, and may be used in industrial production.

Description

technical field [0001] The invention belongs to the technical field of soft magnetic material production and relates to a preparation method of high-purity iron oxide red powder. Background technique [0002] With the surge in demand for magnetic materials in the information age, as the main component of magnetic materials, the demand for iron oxide red powder is increasing day by day. As high-purity iron oxide red powder as a high-end magnetic material, in addition to requiring that the content of impurities such as silicon, aluminum, calcium, and magnesium be less than 80ppm, the manganese content is also required to be less than 0.2%. The raw material of iron oxide red powder is cheap ferrous salt, and its source can be divided into two categories: the first category belongs to hydrochloric acid system, such as ferrous chloride, which comes from the waste acid solution for cleaning steel plates. The manganese content in the steel plate is usually less than 0.2%. The oth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/24
Inventor 庞震蔡瑞芳林阳辉唐卫东陈天鹏徐承杰
Owner FUDAN UNIV
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