The method of obtaining zheleznorudnogo pigment and installation for its implementation

 

(57) Abstract:

The inventive reactor EDM dispersion 1 load the granules of metallic iron, iron shavings or pieces of non-alloy steel, filled with water, but the electrodes serves pulse voltage from source 2. The products of erosion is sent to the hydrocyclone 3 for separating suspension of dispersed particles of iron from redispersion. The loss of iron in reatore 1 fill from the spout 5. Iron-containing suspension is filtered on the filter 6, the filtrate is directed to the collection of filtrate 8, add water, and fed into the reactor EDM dispersion 1. Iron pasta with filter 6 serves in the reactor oxidant 7, add water or filtrate. The suspension contains a solid phase in an amount of 10 to 20 wt. Pass carbon dioxide with stirring 6 24 hours then air or oxygen 1 24 hours of the Oxidized slurry is filtered at the filter 9. The filtrate in the collection of 10, add water and sent to the reactor oxidant 7. Sediment thermoablative in the furnace 11 and crushed in the mill 12. Completely no harmful effluents and emissions into the atmosphere. The pigment has the following molar specifications: mass fraction of VC connections the g/m2the pH of the aqueous slurry 7, the oil absorption of 30 g/100 g pigment dispersibility 28 μm, the residue, insoluble in HCl less than 0.1 wt. 2 S. p. f-crystals, 1 Il. table 1.

The invention relates to the chemical industry, in particular the production of pigments.

Closest to the claimed method is a method of obtaining micaceous iron pigment, which is that in a reactor filled with a solution of iron salts, in particular, sulphate of iron, immersed metallic iron in the form of chips or flakes, and through the reactor is purged with an oxidizing agent, in particular air, resulting in a partially digidrirovanny hydroxide of iron III, i.e., contains some basic salt, which is filtered, and the filtrate is returned to the cycle [1]

The disadvantage of this method is the necessity of washing the precipitate from soluble salts when used in the form of a 'green' product, which leads to the formation of wastewater, and to obtain calcined pigment from lepromatosa precipitate is formed a large amount of harmful gas emissions, which not only pollute the environment and require cleaning, but also increase the demands on the corrosion resistance of ventilation with what about the pigment, includes a reactor-oxidant iron-containing component with means for entering liquid and air, a filter device for conveying filtrate in the reactor, the oxidizing agent and furnace for the heat treatment sludge [1] the Disadvantages of the known method and the known installation.

The invention solves the problem of elimination of harmful effluents and emissions.

This is achieved by the fact that, as the iron-containing component used metal iron, subjected to electrical discharge to the dispersion, followed by processing the resulting suspension with carbon dioxide, as well as the fact that in the known installation also includes means for feeding CO2in the reactor-oxidant, reactor electrical discharge dispersion (RED) with electrodes and means for entering liquid phase, the dispenser for supplying metallic iron in RED, a source of pulse voltage to power the RED, hydrocyclone for separating dispersed and made of large particles of iron, proceedings of the suspension with a stirrer, a filter for separating dispersed particles of iron from the leachate collection leachate with a device for feeding water, a pump for supplying the working fluid (filtrate) in RED, and sborne is SS="ptx2">

The appointment of additional circuit elements in the first stage electrical discharge dispersion is the provision of carrying out the oxidation reaction of iron hydroxide to Fe (III) in mild conditions without using substances that may cause environmental pollution. Note that in the cycles of the filtrate is drawn almost pure water, which allows in case of repairs to drain the working fluid without the use of treatment facilities, which is impossible in the method prototype.

The drawing shows a diagram of the installation for micaceous iron pigment.

The installation includes: reactor 1 EDM dispersion, source 2 pulsed voltage, the hydrocyclone 3 collection 4 suspension with a stirrer dispenser iron 5, the filter 6 suspensions of iron-containing component, the reactor oxidant 7 with a stirrer, a collection of filtrate 8 after primary filtration, the filter 9 suspension of intermediate, collection of leachate 10 after filtering the intermediate product, progulochnuju furnace 11, the mill 12.

The device operates as follows.

To download RED metallic iron in the form of granules, chips or other form of pieces Nele what about the leads to the spark erosion of the metal. The products of erosion are carried by the flow of water from the RED and through the hydrocyclone 3, where the separated large particles of iron, are sent to the collector of the suspension with mixing device 4. The loss of metal in RED 4 is filled from the dispenser 5. This is followed by filtering the resulting suspension of iron-containing component on the filter 6. Filtered iron-containing paste is diluted in the reactor-oxidant 7.

The filtrate (water) filter 6 is directed to the collection of filtrate 8, wherein the fill water loss, gone with the sediment and direct to the stage of dispersion. In the reactor-oxidant 7 receive a suspension with a solids content of 10-20% Through the suspension with stirring miss carbon dioxide within 6-24 h, and then the flow of carbon dioxide ceased and leak air or oxygen within 1-24 hours Of reactor-oxidant 7, the suspension is sent to the filter 9. The filtrate through a collection of 10 where replenish the loss of water gone with the sediment, direct to the stage of oxidation.

The precipitate from the filter 9 calcined in a furnace 11 and grind in the mill 12.

Since the reaction involves the dispersed particles of Fe and FeO may use as habitat (acidifying) substance carbon dioxide, in the Ktsia to the end, should the presence of an acid residues stronger acids, such as sulfuric or hydrochloric.

The resulting product is a micaceous iron pigment, the characteristics of which are given in the table.

The table shows that the obtained pigment none of the indicators is not inferior to the requirements of THE 6-10-602-74.

The time of transmission of carbon dioxide and air determines the color of the obtained pigment dark brown with 6-time transmission of carbon dioxide and low time transmission of air and to red or 24-hour flue gases.

Thus, the invention allows to completely eliminate harmful discharges and emissions, as well as to obtain a pigment, which correspond to modern requirements.

1. The method of obtaining micaceous iron pigment, comprising the oxidation of iron containing suspension with oxygen, the Department obtained precipitate from the filtrate, the last one on the oxidation of suspension and heat treatment of the filter cake, wherein the iron-containing slurry is prepared by electrical discharge dispersion of metallic iron and before oxidation through the resulting suspension is passed placode reactor-oxidant iron containing suspension with devices to enter the liquid phase and air, a filter device for conveying filtrate in the reactor, the oxidizing agent and furnace for the heat treatment of sludge, characterized in that the reactor-oxidant alternatively provided with a device for supplying carbon dioxide gas, and the installation further includes a reactor EDM dispersion, a dispenser for feeding metallic iron in the specified reactor, a source of pulse voltage for the power supply electrodes of the specified reactor, a cyclone for separating suspensions dispersed particles of iron and redispersion particles, proceedings of the suspension of dispersed particles of iron with a stirrer, a filter for separating dispersed particles of iron from the filtrate, the collection of filtrate, pump filtrate into the reactor EDM dispersion, as well as the collection of filtrate, mounted in front of the feeder of the filtrate in the reactor-oxidant.

 

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