A method of obtaining a red micaceous iron pigment

 

(57) Abstract:

Usage: the pigmentation of paints, phosphors, plastics, chemical fibers. The inventive from mine waters containing iron (II) with a pH of 1.5 to 3.5 allocate zhelezookisnye bacteria. Mine water is passed through a reactor filled with an inert fiber. The number of bacteria - 109- 1010cells per 1 g of inert fibers. Through the reactor at 15 - 50oC bubbled air into the number of R/min, where P is the volume of the reactor. The obtained hydroxide iron (III) thermoablative in an autoclave at 180 - 260oC or in air at 500 - 1000oC. the Pigment is washed, dried and milled. The pigment has a color ranging from orange to red-brown, the hiding power 4 - 8 g/m2the dispersibility of 15 to 20 microns, an oil absorption of 20 to 25 g/100 g pigment. 2 C. p. F.-ly, 2 tab.

The invention relates to the recycling of iron-containing waste to produce pigments used for the pigmentation of paints, phosphors red glow, plastics, chemical fiber, paper, tiles and other materials.

A method of obtaining red micaceous iron pigment, comprising the oxidation of a solution, steriade the soba are using the solution, containing iron (II) with a high concentration, the presence of harmful effluents.

The objective of the invention is to obtain high-quality pigment using a dilute solution containing iron (II).

This is achieved in that in the method of obtaining the red micaceous iron pigment, comprising the oxidation of a solution containing iron (II) heat treatment of the resulting sludge, washing, drying and grinding the obtained pigment according to the invention as specified solution using dilute solution with a pH of 1.5 to 3.5, in particular mine water before oxidation allot of them zhelezookisnye bacteria, and the oxidation is carried out in the reactor filled with an inert fiber, in the presence of these bacteria, taken in the quantity of 109- 1010cells per 1 g of inert fibers at a temperature of 15 - 50oC and aeration of the specified solution with a flow rate of air, equal to P/min, where P is the volume of the reactor. Heat treatment of sludge are under hydrothermal conditions at 180 - 260oC or in air at 500 - 1000oC. depending on the heat treatment temperature get red pigments of various hues.

The optimal number of bacteria is determined by the completeness and wrentit slower and not until the end, and the increase in the number of bacteria above 1010cells per gram of fiber is almost impossible.

The boundary values of the temperature oxidation are related to the fact that at temperatures below 15oC the length of the process is increased considerably, and above the 50oC stops the activity of bacteria.

Air consumption less than P/min significantly increases the oxidation and increase it is unfeasible since the time of oxidation decreases slightly.

Reducing the temperature of hydrothermal treatment below 180oC allows the initiator to translate amorphous precipitate of iron (III) in the pigment, and at temperatures above 260oC deteriorates color pigments due to the increase in the average size of the particles, and the pigment gets brown. Heat treatment in air atmosphere at a temperature below 500oC leads to the deterioration of the color pigment and oil absorption, and at temperatures above 1000oC the pigment particles are sintered, and worse of all quality parameters of pigment.

Example 1. Mine water with a temperature of 20oC from waste copper mines containing 1.8 g/l Fe2+, 0.3 g/l Fe3+, 90 mg/l Cu2+150 mg/l Zn10cells/g of fiber. Through the reactor was barbotirovany the air of one volume to the volume of the reactor per minute. After 2 h, the concentration of Fe3+the solution was 2.1 g/l, Fe2+less 0,007 g/l Hydroxide iron (III) resulting from the oxidation of iron (II) was placed in an autoclave and subjected to processing at 220oC. In the hydrothermal treatment was formed iron oxide pigment properties.

Other examples (2-17) similar to the first and different parameters of oxidation, which are listed in the table. 1. Qualitative indicators of pigments depending on the conditions of heat treatment are given in table. 2.

Presented in table. 1 and 2 examples, the invention allows to obtain red micaceous iron pigments of different colors, not inferior in quality indicators known micaceous iron pigments, it uses simple technology, recycled waste mine water.

1. The method of obtaining micaceous iron pigment, comprising the oxidation of a solution containing iron (II) heat treatment of the resulting sludge, washing, drying and grinding the obtained pigment, characterized in that as a solution containing deleltoubasa bacteria, and oxidation is carried out in the reactor filled with an inert fiber in the presence of these bacteria, taken in the quantity of 109- 1010cells per 1 g of inert fiber, 15 - 50oWith and aeration of the specified solution with air flow rate equal to R/min, where P is the volume of the reactor.

2. The method according to p. 1, characterized in that the heat-treated sludge are under hydrothermal conditions at 180 - 260oC.

3. The method according to p. 1, characterized in that the heat treatment are in the air atmosphere at 500 - 1000oC.

 

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1 tbl, 3 ex

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9 cl, 12 ex

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SUBSTANCE: method of sulphide minerals oxidation includes feeding of pulp with sulphide minerals and oxidising agent into reactor with following its blending and outlet of oxidised composition from reactor. During blending of pulp and oxidising agent in internal chamber of reactor in turbulent conditions it is implemented mechanical activation of surface of solid phase of pulp and disperse of oxidising agent. Outlet of oxidised compositions from internal chamber into external chamber of reactor is implemented under action of pressure created by inlet flow of pulp through openings overlapped in top part of internal chamber by regulator of pulp outlet. Additionally liquid phase of pulp is continuously circulates from external chamber into internal chamber of reactor. Oxidation rate of sulphide minerals is regulated by means of changing of oxidising agent concentration in pulp ensured b changing of its amount form 3000 up to 15000 mg·l/h at activation of pulp in reactor.

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1 dwg, 3 tbl, 3 ex

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