Method for producing iron oxide red with green copperas

A technology of ferrous sulfate and red iron oxide, applied in the direction of iron oxide, iron oxide/iron hydroxide, etc., can solve the problem of not driving the recycling of titanium dioxide by-product ferrous sulfate, excessive silicon impurity content, low iron oxide content, etc. problem, to achieve the effect of short reaction time, high chemical level and high iron recovery rate

Active Publication Date: 2010-06-09
PANZHIHUA LIYU MINING
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

According to incomplete statistics, the by-product of ferrous sulfate in my country's titanium dioxide industry exceeds 1 million tons per year. If it is not handled properly, it will definitely cause serious environmental pollution.
[0004] Prepare iron oxide red with ferrous sulfate mostly adopt methods such as direct calcination at present, and production cost is higher, and mostly do not have reasonable impurity removal process, cause the quality of product poor, iron oxide content is not high (Fe 2 0 3 <98.5%), the content of impurities such as silicon exceeds the standard
This poor quality iron oxide red product has little application value and cannot drive the recovery and utilization of ferrous sulfate, a by-product of titanium dioxide.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Put 10kg of ferrous sulfate (industrial grade, containing seven crystal waters) and 3kg of water into the reactor (with heating and stirring), add 0.5kg of 10% ammonia and 0.1kg of iron powder and stir evenly. The temperature is kept at 75°C, and the reaction is carried out until the pH of the solution is 5-6. Filtrate, remove 5% of water by evaporation, and obtain 9.5 kg of filter residue after cooling, crystallization, and pressure filtration.

[0023] The filter residue is dried at 150°C, calcined at 550°C, the calcined crude product is washed 5 times with water with a weight ratio of 1:1, dried at 120°C, and crushed to an average particle size of less than 2 microns , the finished product is 2.35kg after packaging.

[0024] The measured purity of the finished iron oxide red is 99.36%, and the recovery rate is 82%.

Embodiment 2

[0026] Put 10kg of ferrous sulfate (industrial grade, containing seven crystal waters) and 30kg of water into the reactor (with heating and stirring), add 100kg of 30% ammonia and 5kg of iron powder and stir well, and keep the temperature during the reaction. At 95°C, react until the pH of the solution is 5-6. Filter, remove 30% of water by evaporation, and obtain 9.2 kg of filter residue after cooling, crystallization and pressure filtration.

[0027] The filter residue is dried at 300°C, calcined at 950°C, the calcined crude product is washed twice with water with a weight ratio of 1:8, dried at 220°C, and crushed to an average particle size of less than 2 microns , 2.3kg of the finished product is obtained after packaging.

[0028] The measured purity of the finished iron oxide red is 99.41%, and the recovery rate is 80%.

Embodiment 3

[0030] Put 10kg of ferrous sulfate (a by-product of titanium dioxide produced by Panzhihua Ruilong Metallurgical Material Development Co., Ltd., containing seven crystal waters) and 8kg of water into the reactor (with heating and stirring), and add 6kg of ammonia water with a concentration of 18%. and 0.8kg of iron powder, and then stir evenly. During the reaction, the temperature is kept at 85° C. until the pH of the solution is 5-6. Filtrate, remove 20% of water by evaporation, obtain 9.4kg of filter residue after cooling, crystallization, and pressure filtration.

[0031] The filter residue is dried at 280°C, calcined at 850°C, and the calcined crude product is washed three times with water with a weight ratio of 1:6, dried at 200°C, and crushed to an average particle size of less than 2 microns , 2.33kg of finished product is obtained after packaging.

[0032] The measured purity of the finished iron oxide red is 99.38%, and the recovery rate is 81%.

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Abstract

The invention relates to a production method for iron oxide red through ferrous sulfate. The invention has technical proposal that ferrous sulfate is used as the raw material; iron powder and ammoniawater are used as regulators; and the high quality iron oxide red is produced through air oxidation. The invention can effectively treat the waste ferrous sulfate from the titanium pigment plant, andthe purity of the iron oxide red obtained with the invention is higher than 99.2 percent. The invention has the advantages of no pollution, short flow, high time effect, high iron recovery rate, and comprehensive resources utilization.

Description

technical field [0001] The invention relates to a production method of iron oxide red, in particular to a method for producing iron oxide red for ferrite by using ferrous sulfate as a by-product of titanium dioxide. Background technique [0002] Ferrite magnetic materials have been widely used in wireless communications, radio and television, automatic control, radar navigation, measuring instruments, computers, aerospace, printing, home appliances and medicine, and the main raw material for the production of ferrite magnetic materials is Fe 2 o 3 (About 70-80%), namely iron oxide red, the quality of iron oxide red directly affects the performance of ferrite magnetic materials. [0003] The common production methods of iron oxide red include green vanadium calcination method, wet air oxidation method and aniline method. The raw materials of these methods are mostly iron sheet and sulfuric acid. The high price of raw materials limits the production of iron oxide red. At the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G49/06
Inventor 汪云华关晓伟何德武
Owner PANZHIHUA LIYU MINING
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