Method for producing the yellow pigment of ferric oxide from ferrous sulphate of byproduct abolished by titanium white

A technology of ferrous sulfate and yellow iron oxide, applied in fibrous fillers and other directions, can solve the problems of serious flocculation, affecting the dispersibility of final iron oxide yellow pigment, etc., and achieve the effects of reducing production cost, prolonging hydrolysis time, and removing impurities thoroughly.

Inactive Publication Date: 2003-05-07
CNOOC CHANGZHOU PAINT & COATINGS IND RES INST
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

The seed crystals produced by the traditional sulfuric acid method are amorphous particles, and the flocculation is serious, which seriously affects the dispersibility of the final iron oxide yellow pigment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The refining of embodiment 1 ferrous sulfate heptahydrate

[0032] In a volume of 10m 3 In the corrosion-resistant tank, add 7.0m 3 Add 7.0 tons of titanium dioxide waste secondary ferrous sulfate (90%) to water, and now the concentration of ferrous sulfate heptahydrate solution is 700g / L, add 112kg of concentrated sulfuric acid (98%), the initial pH of the system is 1.0~1.5, add 63kg Iron sheet, keep the temperature of the system at 60°C by steaming for 8 hours and measure the pH of the system in the range of 3.0 to 4.5. Then pump into 20m 3 In the settling bucket, add water to a total volume of 16.5m 3 , ferrous sulfate heptahydrate concentration diluted to 400g / L, adding 2.2kg concentration is 20% polyacrylamide flocculant, its consumption is about 0.007% of ferrous sulfate heptahydrate weight, stirred for 10 minutes, left standstill for 6 hours, The supernatant of 15.8m can be separated 3 , which is a refined ferrous sulfate heptahydrate solution with a concentra...

Embodiment 2

[0033] Example 2 Preparation of seed crystals (using ammonia gas)

[0034] The present embodiment adopts traditional seed bucket, and volume is 40m 3 . Air or ammonia gas enters the seed crystal barrel from the tube at the bottom of the barrel and is evenly distributed into the reaction system in the barrel through the vent hole of the air distributor.

[0035] First inject 16m into the above-mentioned seed bucket 3 Water, and then 391.4kg of ammonia gas is introduced from the bottom of the barrel, the temperature of the system is controlled at 20°C, and 16m 3 Refining ferrous sulfate heptahydrate solution (400g / L) prepared in embodiment 1, now in the barrel, the concentration of ferrous sulfate heptahydrate was 200g / L, about pH 6.0~8.0, ammonia consumption was ammonia and sulfurous acid heptahydrate 50% of the theoretical amount of iron reaction. Then feed air from the bottom of the seed bucket for about 24 hours, and the pH of the system reaches 5.0 to 7.0, and 1024.5 kg...

Embodiment 3

[0036] Example 3 Preparation of seed crystals (directly using ammonia water)

[0037] The seed crystal barrel adopted in this embodiment is the same as that in Embodiment 2 except that the ammonia water metering tank is housed on the top of the seed crystal barrel.

[0038] In the above-mentioned seed crystal bucket, add ammoniacal liquor (20%) with the ammoniacal liquor metering tank, its amount is 1957kg, and following steps and addition are all the same as embodiment 2. The needle-shaped light yellow-green iron oxide yellow crystal seeds are prepared for use in oxidation synthesis.

[0039] The method of this embodiment is particularly suitable for selection by users close to liquid ammonia production plants.

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Abstract

A process for preparing iron oxide yield pigment from ferrous sulfate as the by-product of titanium oxide includes such steps as reducing iron scale at 50-70 deg.c, hydrolyzing for 6-10 hr, flocculating, deposition, refining ferrous sulfate, neutralizing with ammonia to generate crystal seeds, and neutralizing with ammonia while oxidizing with air to obtain target product. Its by-product, solution of ammonium sulfate, can be used for preparing composite fertilizer.

Description

technical field [0001] The invention relates to a method for producing iron oxide yellow pigment from titanium dioxide waste paraferrous sulfate. Background technique [0002] Titanium dioxide is a high-grade high-quality white pigment. With the continuous development of the economy, the demand continues to increase, and imports alone are far from being able to meet the requirements. At present, my country mainly adopts the sulfuric acid method to produce titanium dioxide. This method produces about 4 tons of ferrous sulfate as a by-product for every 1 ton of titanium dioxide produced. According to statistics, the output of titanium dioxide in 2002 will reach 400,000 tons, and the output of waste secondary ferrous sulfate will reach 1.6 million tons. Such a large amount of waste by-products, if the original stacking method is still used, the large space occupied and the impact on the environment will seriously restrict the development of the titanium dioxide industry. Al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/24
Inventor 蔡传琦曾昭仪徐启利
Owner CNOOC CHANGZHOU PAINT & COATINGS IND RES INST
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