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

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

Inactive Publication Date: 2003-05-07
CNOOC CHANGZHOU PAINT & COATINGS IND RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The seeds produced by the traditional sulfuric acid method and the mixed acid method are all amorphous particles

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031]The refining of embodiment 1 ferrous sulfate

[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 concentration of 400g...

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] Inject 30m into the above-mentioned seed crystal bucket 3 Water, and then 146.7kg of ammonia gas was introduced from the bottom of the seed crystal bucket, the temperature of the system was controlled at 20°C, and 2m 3 Refining ferrous sulfate heptahydrate solution (400g / L) made by embodiment 1, now in the barrel, ferrous sulfate heptahydrate concentration is 25g / L, about pH value 9.8, ammonia consumption is ammonia and ferrous sulfate heptahydrate 150% of the theoretical amount of reaction. Then air is introduced from the bottom of the tank for about 2 hours to make the pH of the system reach the range of 9.5-9.7. ...

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 733.5kg, following steps and addition are all the same as embodiment 2. The obtained reddish-brown crystalline iron oxide red seeds are used for oxidation synthesis.

[0039] The method of this embodiment is particularly suitable for selection by users near ammonia water production plants.

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Abstract

A process for preparing iron oxide red 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 heptahydrated 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 red 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. Altho...

Claims

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Application Information

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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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