KR20030026692A - Manufacturing method of ferric sulfates - Google Patents

Abstract

PURPOSE: Provided is a preparation method of ferric sulfate(Fe2(SO4)3) by reacting the sources of iron, Fe3O4, generated from wire industry with concentrated H2SO4 without use of catalyst and discharge of pollutant byproducts(NO2, NO, etc.) unlike conventional method using ferrous sulfate(FeSO4) and HNO3. CONSTITUTION: A ferric sulfate(Fe2(SO4)3) solution is prepared by reacting Fe3O4 generated from wire industry with concentrated H2SO4(98%) at 150-250deg.C under flowing O2, wherein the formed Fe2O3 containing unreacted iron oxide is dissolved in H2SO4 solution at 70-80deg.C, followed by filtering. The above process is expressed by the formula of 2FeO + 3H2SO4 + O2 --> Fe2(SO4)3 +3H2O, Fe2O3 + 3H2SO4 --> Fe2(SO4)3 +3H2O.

Description

Ferric Sulfate Manufacturing Method {MANUFACTURING METHOD OF FERRIC SULFATES}

Ferric sulfate products are mass-produced at titanium (factory).

This product is produced as a dispersion in the manufacturing process of (TiO ₂ ) Titanium Oxide, which contains a large amount of impurities such as Mn (manganese ions), nitrates, and soda salts, and Pb, Cd, etc. There is a drawback that causes major obstacles to waste water treatment and production of mineral products for animal addition.

Such impurities are sometimes contaminated in titanium ores, and impurities are present due to oxidant contamination such as catalysts in the process of producing ferric sulfate through an oxidation process in iron sulfate.

Ferric sulfate is used as a factory wastewater and dye wastewater treatment agent such as flocculant, pesticide, desulfurization.

In the present invention, a raw material in which iron oxides such as iron oxide FeO, iron oxide Fe ₂ O ₃ tetraoxide, and Fe ₃ O ₄ are produced in large quantities are used as raw materials of iron sulfate.

Iron oxide produced in the wire manufacturing process is high in purity and good in quality control, so that impurities are little insoluble, so it is insoluble in dilute sulfuric acid and materials suitable for manufacturing high-purity iron sulfate, that is, iron oxide is insoluble in 40-70% aqueous sulfuric acid solution. Because of its properties, it is placed in special containers, such as GL tanks, and dissolved at 130 ° C pressure and 5kg / cm ² , making it a great barrier to material quality and mass production.

Conventional manufacturing process ferric sulfate production process ferrous sulfate by injecting a large amount of air into ferrous sulfate aqueous solution using nitrate, nitrite and nitrate while maintaining the temperature of 70 ~ 80 ℃ in aqueous solution of ferrous sulfate The oxidation conversion to ferric iron is used. In this oxidation process, there is a defect in that impurities such as a catalyst are introduced therein, and an environmental treatment facility increases due to the emission of harmful nitrogen oxides such as No ₂ and No in the oxidation process.

The present invention obtains useful industrial resources by regenerating iron oxide, which is a waste of the wire manufacturing process, which is eliminated by eliminating the above drawbacks with ferric sulfate.

In the present design, the iron oxide water is concentrated sulfuric acid (98%) in consideration of the physical properties that are not dissolved in sulfuric acid, and the material is a steel plate as a container to induce a reaction or use a reaction vessel made of a kiln ribbon type object, brick construction It succeeded in inducing the reaction while maintaining the temperature of 150-250 ℃ and inducing mass air contact in dry and concentrated sulfuric acid semiferrous layers. It was able to manufacture ferric sulfate as ferric sulfate and ferric oxide as ferric sulfate, and to make quality and mass production. .

The equation is as follows.

1.2FeO + 3H ₂ S0 ₄ + O ₂ → Fe ₂ (SO ₄ ) ₃ + 3H ₂ O

2.Fe ₂ O ₃ + 3H ₂ SO ₄ → Fe ₂ (SO ₄ ) ₃ + 3H ₂ O

The reaction of concentrated sulfuric acid and iron oxide proceeds according to the temperature and the stirring force, and when a lot of air oxidizes ferrous oxide to ferric oxide, there is no need to select a separate oxidation process.

In other words, the reaction conditions of concentrated sulfuric acid (96-98%) and iron oxide were completed production of high-purity ferric sulfate by utilizing the characteristics that the air oxidation is carried out simultaneously with the temperature of 150 to 250 ℃ and stirring.

When the reaction of concentrated sulfuric acid and ferric acid is completed, there is also a powder form.

Since ferric sulfate of the powder contains a lot of unreacted iron oxide, the product is placed in a container made of FRP material and dissolved in an aqueous solution of 70 to 80 ° C.

As the dissolution proceeds, the solution is led to a reddish red 40-45% aqueous solution and filtered.

The filtrate is used as a product, and unreacted iron oxide kale is collected and put in a reactor to react.

That is, the ferrous sulfate is induced to ferric sulfate by contacting a large amount of air by inducing and stirring a concentrated sulfuric acid directly to a raw material of high purity iron oxide.

<Example>

2 kg of iron oxide (Fe ₃ O ₄ ) produced as a by-product from the wire manufacturing process was added to a 15 liter capacity of iron container, and 4 kg of concentrated sulfuric acid was added slowly, and the reaction was completed for 2 hours while the temperature was heated to 150-250 ° C. The resulting mixture was separated by filtration, 45% of ferric sulfate solution and 3 liters of liquid were recovered, and 200 g of unreacted iron oxide was recovered.

Grade analysis table of this product

Ferric Sulfate Purity 99.2%

2. Ferrous sulfate 0.1%

3. Manganese sulfate 0.03%

4. Soda Salt Stress

5. Nitrate Stress

6. Pb2PPM

7. cd stress

In this way, there is an advantage that can be recycled to industrial resources without discarding the iron trioxide in the wire production process.

Claims (1)

Ferric sulfate manufacturing method characterized in that the iron oxide generated in the wire manufacturing process is put into concentrated sulfuric acid (purity 98%) and heated to 150-250 ° C. under air contact for combined dissolution.