A method of obtaining a pigment ulesastumisega

 

(57) Abstract:

The invention relates to the field of technology for inorganic pigments and can be used to obtain inorganic iron-containing modified pigment. The essence of the invention lies in the fact that the inorganic pigment iron modified by the preparation of a working solution of ferrous raw materials, dehydration, modification, drying and dispersion, at the same time as iron-containing raw materials use of iron concentrate produced in the steel mills during thermal processing of waste pickling acid and (or) means of hydrochloric acid solutions, which expose repulpable with water until the concentration of Fe concentrate 300-350 grams/cubic DM, oxidized salt of divalent iron to trivalent bertoletova salt in an acidic medium at a pH of 2.5 to 4 and neutralized with Belita powder technical to pH 5.5-6 and after filtering pasta modify resin melamineformaldehyde in the amount of 2-6% by weight of the pigment in terms of dry weight. The method can improve the dispersibility of the pigment, to reduce the specific consumption of Pigi technologies for inorganic pigments and can be used to obtain inorganic iron-containing modified pigment.

Currently, the iron-containing pigments are obtained by grinding natural iron-containing raw materials: hematite iron ore, Zheleznyakov, swamp ore, bauxite and other Department of waste rock, wet or dry screening, washing and drying (E. F. white, I. C. Riskin, Chemistry and technology of pigments. "Chemistry", L. 1974, S. 407).

The shortcomings in the industry. The process is characterized by multi-stage and is accompanied by the production of large quantities of wastewater in the amount of 40-50 m3to obtain 1 ton of pigment, and a low dispersion of the obtained pigment that leads to an increase in specific consumption of pigment and related materials. Possible additional mechanical grinding grains and aggregates of particles upon receipt of the inorganic pigment iron-modified requires high energy costs and is not economically justified.

Known methods for producing iron-containing pigments (analogues): the dry process consisting of separation of waste rock, dispersion material, land and air separation. (E. F. Belenky and I. C. Riskin, Chemistry and technology of pigments, Chemistry, L. 1974 S. 407 and beyond); the wet method, comprising about who and grinding. (E. F. Belenky and I. C. Riskin, Chemistry and technology of pigments, Chemistry, L. 1974 S. 407 and forth, K. I. Tolstikhina, the Natural pigments of the Soviet Union, M. 1963, S. 287 and later).

Disadvantages ways analogues and method used in the industry: low level of dispersion of pigment particles, because in natural iron-containing raw material contains a significant amount of aggregates of particles and coarse grains, not collapsing when existing methods of its processing, in turn, the destruction and dispersion of aggregates of particles and coarse grains of pigment requires high energy costs and low content of basic substance of Fe2O3in natural raw materials.

As the prototype accepted way to obtain iron-containing pigment, including the preparation of a working solution of ferrous raw materials, its dehydration, drying and dispareunia (E. F. Belenky and I. C. resin, Chemistry and technology of pigments, "Chemistry", L. 1974 S. 422-426).

The disadvantage of this method prototype: low rate of dispersion of pigment particles, because of natural raw materials has a significant amount of aggregates of particles and coarse grains, not collapsing when existing methods of its processing. As a result the by a multi-stage and is accompanied by the production of large quantities of wastewater in the amount of 40-50 m3to obtain 1 ton of pigment.

Possible additional mechanical grinding grains and aggregates of particles upon receipt of the inorganic pigment iron-modified requires high energy costs and is not economically justified.

The essence of the invention lies in the fact that in order to improve dispersibility of the pigment particles of inorganic iron-containing modified as iron-containing raw materials use of iron concentrate produced on the metal complexes in the process of thermal processing of spent sulfuric acid pickling and (or) means of hydrochloric acid solutions, which expose repulpable with water until the concentration of Fe concentrate 300-350 g/DM3, further oxidize the salt of divalent iron to trivalent bertoletova salt in an acidic medium at a pH of 2.5 to 4 and neutralized with Belita powder technical to pH 5.5-6, filter, modify to increase the specific surface of the melamine-formaldehyde resin powder in the amount of 2-6% by weight of pigment, calculated on dry basis and dried at a temperature of 110-140oC to a residual moisture content not more than 0.5%

During the existence of the x particles of iron ore concentrate to produce a fine product Televisao, brown or wine-colored depending on the mass fraction of iron in the original iron concentrate and oxidation of iron from the ferrous to the ferric state.

Adding Belita powder technical, corresponding to THE 23.4.203-91 (instead of THE 14-11-181-89), the process proceeds neutralize the solution to pH 6-6,5 and the first modification of the pigment concentrate.

Then hold the dehydration of the pulp by filtration to obtain paste and the subsequent modification of the surface of the pigment particles melamine-formaldehyde resin in the amount of 2-6% by weight of the pigment in terms of dry weight. The resulting paste (slurry) is dried at a temperature of 110-140oC.

The greatest dispersion of the pigment concentrate is achieved after drying paste (slurry) at a temperature of 110-120oC to 0.3-0.5% of moisture.

The inorganic pigment iron modified to classify fractions 1-3 μm and the residue on the sieve 0,063 not more than 3%

If the concentration of iron concentrate in the slurry is less than 300 g/DM3there is a slowing of the process of obtaining pigment and consumed excessive amounts of reagents, if more than 350 g/DM<2">

If the oxidation of ferrous iron bertoletova salt is carried out at a pH of less than 2.5 or greater than 4, the pigment does not acquire the desired colorations.

If the neutralization Belita powder technical conduct to pH less than 5.5, it decreases the degree of dispersion of the pigment, if more than 9, then the pigment loses its coloring and its consumption for dyeing products increases.

The inorganic pigment iron modified, used to prepare paint materials in the production of plastic products, manufacture of rubber, in the manufacture of colored construction concretes and mortars and other industries.

Industrial implementation of the method is conducted under conditions of TOAST "CELAC".

As the iron-containing raw materials used iron concentrate produced in metallurgical production in the steel mills during thermal processing of waste pickling seriocity and (or) means of hydrochloric acid solutions.

Iron concentrate produced in metallurgical production in the steel mills during thermal processing of waste pickling SalesOrderHeader concentrate 300-350 g/DM3, further oxidized in a solution of salts of divalent iron to trivalent bertoletova salt in an acidic medium at a pH of 2.5 to 4, and the slurry was neutralized with Belita powder technical to pH 5.5-6.

The above operation is conducted in a mixer with a capacity of 3 m3with mechanical stirring for 30 min, and after filtering on the horizontal filter. The resulting slurry was modified to increase the specific surface area, resulting in increased coverage of the melamine-formaldehyde resin powder brand MS-R, corresponding to the requirements of THE 6-05.1867-79 in the amount of 2-6% by weight of the pigment in terms of dry weight. Then paste (slurry) was dried in a rotary tube furnace at a temperature of 110-140oC until the moisture content of 0.3-0.5%

The inorganic pigment iron modified classified to a fraction of -3 μm and remains on the sieve 0,063 mm, not more than 3%

The resulting pigment is inorganic iron-containing modified to be used for preparation of paints.

The industrial implementation are given in the table.

The prototype of the pigment contained 76,2-93,4% Fe2O3, 0,53-12,59% Al2O3, 1,8-21,5% SiO2, 0,67-3.3% of CaO, Of 0.11 To 1.4% MgO, 0-4,08% SO SUP>.

The proposed method of producing inorganic pigment iron modified characterized by a high hiding power, metastatically and small amount of wastewater is equal to 3-4 m3per 1 ton of finished product.

The method of obtaining iron-containing pigment, including repulpable iron-containing raw material in water, dehydration of the solid phase by filtration, drying and dispersion of the product, characterized in that as the iron-containing raw materials use of iron concentrate produced in the steel mills during thermal processing of waste pickling acid and/or hydrochloric acid solutions, repulpable lead to the concentration of iron concentrate 300 350 g/DM3with subsequent oxidation contained in concentrate salts of divalent iron to trivalent bertoletova salt in an acidic medium at pH of 2.5 to 4.0 and the neutralization Belita powder technical to pH 5.5 to 6.0, and after dehydration of the formed pasta modify resin melamineformaldehyde in number of 2 to 6% by weight of the pigment in terms of dry weight.

 

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