SU1368321A1 - Method of obtaining light-resistant lead chrome yellow - Google Patents

Description

(21) 3971476 / 23-26

(22) 09/30/85

(46) 01.23.88. Number 3

(71) Leningrad Scientific and Production Association Pigment

(72) M.V.Sukhanova, E.S. Marmorshteyn, N.V.Yurieva, V.I.Koshmarova, M.M.Ivanova, T.S.Ostroumova, B.A.Pakhomov, HiA.OxoTHHKOBa, V .N.Vrunov

and A.A.Lukz nec

(53) 667.622.115.1 (088.8)

(56) USSR Author's Certificate No. 1114684, cl. C 09 C 1/20, 1984.

Patent of England} 1396794, cl. C 4 A, 1975.

(54) METHOD OF OBTAINING LIGHT-RESISTANT LEAD CROWN

(57) The invention relates to a technology for producing lead crowns based on chromate, sulfochromate, and sulfochromatmolybdate of lead used in the paint industry.

The method of producing light-resistant lead crowns involves the precipitation of chromium from solutions, containing its ions, washing the precipitated chromium, treating its suspension with sodium silicate, then introducing into the suspension phosphogypsum calcined at 550-650 ° C in an amount of 2-6% by weight of pigment, subsequent processing of the suspension with a solution of antimony trichloride. According to the method, suspension also provides for the introduction of chromium sodium, aluminum compounds, during the processing. After treatment, the pigment precipitate is filtered and dried. Chromium is lightfast (1.2-1.5%), resistant to the effects of sulfur dioxide (8 points), contains soluble lead not more than 1, 5%, low-intensity pigment 20-25 g / 100 g of pigment. 2 hp f-ly, .1 tab.

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with

The invention relates to the production of pigment pigments, in particular, to the technology for producing lead crowns used in the paint industry, for example, for dyeing synthetic fibers.

The aim of the invention is to reduce acid soluble lead in light-resistant lead crowns,

Epimeter 1. To a slurry suspension pre-mixed for 0.5 h, containing 70 g of lead gellet, 360 g of water and 0.9 tons of nitric acid, 195 g of a solution of chromic acid containing 31.4 g CrOj, the crown sedimentation process is carried out at pH 9 at the start of the synthesis to pH 2 at the end of the precipitation. The crown suspension is washed by decantation and diluted twice with water to P: W 1:10 and heated to 65 ° C. Then, 1.7 kg of sodium chloride (0.03 mol / l), 46 g of sodium silicate solution (100 g / l of SiOi) and 83 g of a phosphogypsum filler suspension (50 g / l) are successively introduced into the suspension. After stirring, the suspension is diluted with water to T: W 1:30 and 21.5 g of an antimony trichloride solution (360 g / l according to Sbi05) at pH 8-4 and 5.5 g of aluminum sulphate solution (80 g / l according to AlrjO), neutralized further I OO g solution of caustic soda (50 g / l NaOH). After the introduction of each component, the crown suspension is stirred for 10-15 minutes.

The treated pigment is filtered and dried at 90 ° C. A yellow lead crown, resistant to sulfuric acid (in points), is obtained, with an acid-soluble lead content of 0.5% in the form of PbO.

Example2. To 1500 g of lead nitrate solution (68 g / l Pb (IO3) 2), with stirring, 1500 g of a mixture of precipitates containing 17 g / l CrOj, 3 g / l MoOj, 1 1 g / l 30 and 7 g / l NaOH. The crown sedimentation process is carried out at 20 ° C, the pH of the suspension at the end of the precipitation is 2.5-2.6. The crown suspension is washed by decantation twice, diluted with water to a T: W ratio of 1:20. Then, 3.51 g of sodium chloride (0.03 mol / l), 46 g of sodium silicate solution are successively introduced into the suspension.

(100 g / l in SiOj) and 103.5 g of phosphogypsum suspension (50 g / l).

After stirring, the suspension is diluted with water to a T: W ratio of 1:30 and 21.5 g of antimony trichloride solution (360 g / l) are subsequently introduced at a pH of 8–4, 6.9 g of sulphate solution

aluminum (80 g / l AljOj), neutralize 110 g of sodium hydroxide solution (50 g / l NaOH). After the introduction of each component, the crown suspension is stirred for 10-15 minutes. Processed

the pigment is filtered and. dried at. A lead molybdate crown resistant to sulfuric acid (8 points) is obtained, with an acid-soluble lead content of 1.5%.

The table describes the properties of lead crowns on the proposed and known methods.

These tables show that the proposed method allows

get light resistant pigment.

Claims (3)

1. A method for producing light-resistant lead crowns, including precipitating a crown from a solution containing its ions, washing the resulting suspension, treating the crown suspension with sodium silicate and adding antimony chloride to the suspension, adding sodium hydroxide, calcium and aluminum compounds to the suspension filtering and drying the treated pigment, which is different from the fact that, in order to reduce the acid-soluble lead in the target product while maintaining its high resistance to the effects of the sulfur as a calcium compound, phosphogypy is calcined at 550–650 ° C and introduced into crown suspension after treatment with sodium silicate before the introduction of antimony chloride. 2. Method according to claim 1, characterized in that the crown suspension is prepared on the basis of chromate, sulfochromate or sulfochromate molybdate of evine Tsa. 3. The method according to claim 1, characterized in that said calcined phosphogypsum is used in an amount of 2-6% by weight of the dry pigment. Known method