The composition to obtain a brown micaceous iron pigment
(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 etc., the invention consists in the composition to obtain a brown micaceous iron pigment, consisting of a 90 to 99.5 wt.% precipitation electrochemical treatment of wastewater of electroplating and 0.5 - 10 wt.% reductant - fine metal: aluminum or iron, or of easily oxidizable organic substances - waste oil, waste paper, bottoms production of higher alcohols. The pigment obtained from this composition has the following characteristics: the hiding power 8 - 15 g/m2the oil absorption of 40 to 54 g/100 g pigment. 2 C.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 otherYou know getting micaceous iron inorganic pigments of the industry is izkuyu the technical nature of the claimed invention is a method of obtaining pigments brown sludge from the treatment of electroplating plants with the addition of 65-85 wt.% perlite .The disadvantage of this method is the high energy intensity of synthesis firing at a temperature of 1000-1050oC.Known also getting brown micaceous iron pigment from sediment electrocoagulation treatment of wastewater of electroplating. Higher reactivity of such sediment allows firing at a temperature of 650oC for 1-1,5 hours of Coverage of the obtained pigments is 13-24 g/m2the oil absorption 88-56 g/100g pigment . The disadvantage of this method 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.Object of the invention is the expansion of the scope cheap micaceous iron pigments derived from galvanostatic by preventing the formation of hexavalent chromium.This task is solved by the composition: precipitation electrochemical treatment of wastewater of electroplating and the reducing agent in the amount of 0.5-10 wt.%.As reductants used legkookisljajushchiesja organic matter: from the fine metals: aluminum, iron, in the amount of 0.5-5 wt.%.Introduction to the mixture of the reducing agent also allows you to raise the temperature of synthesis, which reduces the time of receipt of highly resistant pigments.The quantitative ratio of the components is chosen experimentally and is optimal. With the introduction of less than 0.5 wt.% fine metals, or less than 3 wt.% organic reducing agents does not completely eliminate the formation of chromates when thermosense pigments from galvanostatic. With the introduction of more than 5 wt.% metals, or more than 10 wt.% organic reductants they do not have time to fully oxidize during thermosynthesis pigments, which significantly impairs their number.The pigments we get the following technology. Sediment from electrochemical cleaning (ECHO) wastewater of electroplating with humidity 65-85%, containing, calculated on the dry matter wt.%:
Fe2O3- 75 - 97,3
Cr2O3- 0,13 - 13,0
NiO - 0,55 - 9,3
CaO - 0,01 - 2,49
ZnO - 0,01 - 2,0
CdO - 0,01 - 0,2
mixed with reducing agents, dried, calcined and pulverized.Example 1. The original components, wt.%:
Sediment from the electrochemical treatment of wastewater is t at a temperature of 120-150oC. the Dried mixture was thoroughly fray and calcined at a temperature of 500-800oC for 30-60 min Obtained pigments ground to fineness, providing a passage through a sieve 10000 resp/cm2.Examples of the preparation of the pigment composition 2 - 15 carry out analogously to example 1 (see table).The masking characteristics of the obtained pigments:
Rate, g/m2- 3 - 15
The oil absorption, g/100 g pigment - 40 - 54
Pigments have been successfully tested for dyeing natural and artificial leather, polymeric materials, including synthetic fibers, linoleum, building ceramics, porcelain and earthenware products, paints and varnishes.Thus, the claimed technical solution allows to significantly extend the scope of cheap micaceous iron pigments derived from galvanostatic.Sources of information
1. USSR author's certificate N 1375586, class C 03 C 1/04, 1988.USSR author's certificate N 1370124, class C 09 C 1/24, 1988. 1. The composition to obtain a brown micaceous iron pigment from precipitation electrochemical treatment of wastewater of electroplating, characterized in, Thu the chemical treatment of wastewater of electroplating - 90 - 99,5
Restorer - 10 - 0,5
2. Composition under item 1, characterized in that as a reducing agent it contains fine metal - aluminum or iron in the amount of 0.5 - 5 wt.%.3. Composition under item 1, characterized in that as a reducing agent it contains legkookisljajushchiesja organic substances - waste oils, waste paper, distillation residues from the production of higher alcohols of 3 to 10 wt.%.
FIELD: mining industry.
SUBSTANCE: perovskite concentrate, which can be used for manufacture of pigment titanium dioxide for paints, paper, enamels, and plastics, is processed as follows. 1 kg of concentrate is treated under atmosphere conditions with concentrated HCl at 90-100оС for 10 to 20 h to solubilize 75-85% of titanium, radioactive, and other acid-soluble components. Concentration of HCl is then lowered by diluting it with 1-5% HCl solution until TiO2 concentration 50-100 g/L. Thermohydrolysis of solution at 100-105оС accompanied by distilling away HCl leads to residual HCl concentration 20-100 g/L. Distilled HCl is sent to processing of perovskite concentrate. Titanium-containing precipitate is separated from mother liquor, washed first with 15-37% HCl solution and then with water to pH 3. Washed precipitate is treated with aluminum acid phosphate with pH 2-4. Aluminum acid phosphate uptake (on conversion to Al2O3) constitutes 0.5 to 5.0% content of TiO2. Treated precipitate is separated and calcined at 850-870оС to give pigment titanium dioxide. From mother liquor (after separation of Ti-containing precipitate), radioactive components are isolated by 4-6-step extraction with tributyl phosphate. Organic phase-to-water phase ratio is (1.5-2.0):1. Degree of titanium recovery is at least 98%, whiteness at least 96.5 conv. units, brightening power 1650-1800 conv. units, spreading capacity 38.0-40.0 g/m2, oil capacity 25-27 g/100 g pigment. Yield of pigment TiO2 is 95.7-98.0%. Amount of radioactive precipitate does not exceed 0.06 kg.
EFFECT: optimized perovskite concentrate processing parameters.
12 cl, 4 ex