Pigment and method thereof

 

(57) Abstract:

The invention relates to the production of highly resistant inorganic pigments that can be used for coloring plastics, rubber, natural and artificial leather, manufacture of paints and varnishes, as well as decoration of building ceramics and other Essence is the pigment and method of its production, according to which precipitation electrochemical cleaning (ECHO) wastewater of electroplating, containing in terms of oxides in the dry product, wt.%: the iron oxides 75,0 - 97,3; Nickel oxide (II) 0,55 - 9,3; chromium oxide (III) of 0.13 - 13,0; calcium oxide is 0.01 - 2,49; zinc oxide 0,01 - 2,0; cadmium oxide is 0.01 - 0.2 (humidity 75 - 90%) and products of chemical deposition of these waters calcium hydroxide (RO), containing in terms of oxides in dry product, wt.%: the iron oxides 15,0 - 22, 0mm; chromium oxide (III) 1.5 to 12.0; Nickel oxide (II) 0,01 - 2,0; aluminum oxide, 0.5 to 15,2; the silicon oxide of 0.02 to 8.0; calcium oxide 28,5 - 64,0; copper oxide is 0.5 - 14,0; zinc oxide 1.0 to 5.6 and the oxide of cadmium 0.01 to 0.5; the lead oxide of 0.01 - 0.4; magnesium oxide 2,0 - 7,25 (humidity of 60 - 80%), mixed in a mass ratio of: ECHO 25 - 50, RO 70,5 - 49,5, add the reducing agent is finely dispersed iron or aluminum, in the amount of 0.5 to 4.5 wt.% and carefully p is e 30 - 120 min with subsequent grinding of the obtained pigments to particle size of not more than 10 μm. Get the brown pigments of colors from beige to chocolate brown. The hiding power of the pigments 10 - 15 g/m2the oil absorption 32 - 44 g/100 g pigment. 2 S. p. f-crystals, 1 table.

The invention relates to the production of highly resistant inorganic pigments that can be used for coloring plastics, rubber, natural and artificial leather, manufacture of paints and varnishes, as well as decoration of building ceramics and other

You know getting releaxing inorganic pigments industrial waste during the process of calcination of iron precipitation electrochemical cleaning (ECHO) wastewater galvanic production [1]. The disadvantage of this method of obtaining pigments is the oxidation of compounds of trivalent chromium to chromium, which significantly narrows down the possible applications of such pigments. They are used only as anticorrosive pigments in the paint industry. In addition, electrocoagulation cleaning galvanostatic implemented only on a small number of industrial production (8-12% of the total number of electroplating plants), ice (RO).

For processing such galvanostatic known method of processing due to the washing of the sludge and subsequent heat treatment at 420-450oC for 2-3 h [2] . The disadvantage of this method is the low resistance of the obtained pigments, representing a mixture of metal oxides and dim colors (gray to green).

The aim of the invention is to obtain cheap highly resistant pigments ferritic structure derived from galvanostatic, and expanding the scope of their application by preventing the formation of hexavalent chromium.

This is solved by the creation of a pigment containing oxides of non-ferrous metals, oxides of iron (II) and (III), chromium oxide, aluminum oxide, silicon oxide, calcium oxide, magnesium oxide in the following ratio, wt.%:

The copper oxide is 0.5 - 8,4

Zinc oxide is 0.3 to 6,45

Nickel oxide (II) is 0.01 - 4,3

Calcium oxide - 14,8 - 21,4

Aluminum oxide is 0.02 - 9,7

Iron oxide - 37,0 - 64,0

The silicon oxide is 0.02 - 5,1

Oxide chromium (II) - 2,1 - 12,8

Magnesium oxide - 3,2 - 4,5

The oxide of cadmium - 0,2 - 0,3

The lead oxide - 0,1 - 0,2

Restorer-melkodispersnye aluminum or iron - 0.5 to 4.5

The task is also solved by a method of obtaining the, heat treatment and grinding, in which the mixture comprising the oxygen-containing pigment components are used sludge electrochemical (ECM) and reagent (RO) wastewater treatment galvanic production ratio, wt.%:

ECHO - 25 - 50

RO - 70,5 - 49,5

To a mixture of slimes add reducer: fine iron or aluminum in the amount of 0.5 to 4.5 wt.% and mix thoroughly, heat treatment are at 80-110oC for 30-90 min to remove the water to a residual moisture content of 20-30 wt.%, and then when 600-800oC for 30-120 min to thermosynthesis pigments ferritic structure. The grinding of the obtained pigment is carried out to a particle size of not more than 10 μm.

Using sludge electrochemical cleaning (ECHO) wastewater of electroplating, representing the iron hydroxide with adsorbed on it hydroxides of heavy metals. Sludge is a pasty mass brown color with a humidity of 75-80%.

The content of components in it in terms of the oxides of wt.% on the dry product:

Iron oxide - 75,0 - 97,3

Nickel oxide (II) is 0.55 - 9,3

Oxide chromium (III) - 0,13 - 13,0

Calcium oxide is 0.01 - 2,49

The content of components in it in terms of the oxides of wt.% on the dry product:

Iron oxide - 15,0 - 22,0

Oxide chromium (III) - 1.5 to 12.0

Nickel oxide (II) is 0.01 to 2.0

Aluminum oxide is 0.5 - 15,2

The silicon oxide is 0.02 - 8,0

Calcium oxide - 28,5 - 64,0

The copper oxide is 0.5 - 14,0

Zinc oxide - 1,0 - 5,6

The oxide of cadmium - 0,01 - 0,5

The lead oxide - 0,01 - 0,4

Magnesium oxide is 2.0 - 7,25

The invention consists in the creation of technology for highly resistant pigments brown palette of colors based on the recycling of electroplating, which currently are not implemented and are discharged into a dump, polluting the environment.

The invention permits the processing of raw materials (galvanoscope) obtaining highly resistant pigments with good quality characteristics - color, hiding power, stability, heat resistance, providing a broad range of applications.

The quantitative ratio of the components and their heat treatment are selected experimentally and are optimalisatie, and with the introduction of more than 4.5 wt.% reducing agents (fine aluminum or iron) they do not have time to fully oxidize when thermosense pigments, which degrades their quality. The use of less than 25 wt.% sludge ECHO does not allow you to get rich color pigments, and the introduction of more than 50 wt. % these slimes color saturation is almost not growing, but shrinking resource base for the synthesis of pigments due to the low prevalence of methods electrochemical treatment of wastewater of electroplating plants.

Termintes at a temperature of less than 600oC does not allow to fully complete the reaction of formation of stable structures such as spinel ferrites), while increasing the synthesis temperature of more than 800oC is a strong sintering of the particles of the pigments and the deterioration of their quality.

Insufficient temperature and drying time increases the amount of time required calcination and, consequently, increase the cost of obtaining pigments, and increasing temperature and time of drying above the optimal value leads to dusting products and deterioration of working conditions in the production of pigments.

Example 1. Sludge electrochemical and chemical sewage treatment galvanises thoroughly mixed in the mixer pasty materials and dried at a temperature of 80oC for 90 minutes the Dried mixture is calcined at 600oC for 120 minutes the resulting pigments are ground in a vibrating mill or other type of suitable mill to a particle size of not more than 10 μm, stariway bags, labeled and shipped to the consumer.

Similarly prepare examples 2-10, presented in the table.

The table presents data on the chemical composition and modes thermosynthesis pigments according to the invention.

From the data presented in the table it follows that the invention allows to obtain pigments of different shades of brown colors that do not contain harmful compounds in soluble form.

The masking characteristics of the obtained pigments:

rate, g/m2- 10 - 15

the oil absorption, g/100 g pigment - 32 - 44

Examples of the preparation of the pigment composition 2-10 performing analogously to example 1 (see table.)

Pigments were successful production tests for dyeing natural and artificial leather, polymeric materials, building ceramics, manufacture of paints and varnishes for various purposes.

Thus, the claimed technical solution allows RSTI their application in comparison with the known solutions.

Sources of information

1. USSR author's certificate N 1370124, class C 09 C 1/24, 1988.

2. RF patent N 2055086, class C 09 C 1/28, C 04 B 33/14, 1996.

1. Pigment comprising the oxides of copper, zinc, Nickel, calcium, aluminum, iron, silicon, chromium, characterized in that it further comprises the oxides of magnesium, cadmium and lead and the reducing agent - fine aluminum or iron in the following ratio, wt.%:

The copper oxide is 0.5 - 8,4

Zinc oxide is 0.3 to 6,45

Nickel oxide (II) is 0.01 - 4,3

Calcium oxide - 14,8 - 21,4

Aluminum oxide is 0.02 - 9,7

Iron oxide - 37,0 - 64,0

The silicon oxide is 0.02 - 5,1

Oxide chromium (III) - 2,1 - 12,8

Magnesium oxide - 3,2 - 4,5

The oxide of cadmium - 0,2 - 0,3

The lead oxide - 0,1 - 0,2

The reducing agent is finely dispersed aluminum or iron - 0.5 to 4.5

2. The method of producing the pigment component of the pigment oxygen-containing metal compounds, including heat treatment of this mixture and grinding the heat-treated product, wherein as part of the pigment of oxygen-containing compounds using electrochemical precipitation scavenging (ECHO) wastewater of electroplating and products of the reagent deposition of these waters hydroxide CA ratio, add the reducing agent is finely dispersed iron or aluminum in the amount of 0.5 to 4.5 wt.% and mix thoroughly, heat treatment are first at 80 - 110oC for 30 - 90 min, then at 600 - 800oC for 30 to 120 min, the resulting pigment brown colors crushed to particle size of not more than 10 μm.

 

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