Method for preparing iron oxide yellow pigment by using titanium white by-product of ferrous sulfate

A technology of ferrous sulfate and iron oxide yellow, applied in the direction of iron oxide, iron oxide/iron hydroxide, etc., can solve the problems of not meeting market demand, being alkaline, and uneven particle size, etc.

Inactive Publication Date: 2010-12-15
TONGLING RELY TECH
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Problems solved by technology

In this method, ammonia gas or ammonia water is added to the oxidation tank, which will easily cause the pH value of the adding point to become alkaline instantly, and form ferrous hydroxide precipitation, making the particle size uneven, resulting in a darker pigment hue in the later stage, which cannot meet the market demand.

Method used

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Embodiment Construction

[0016] Refining of ferrous sulfate: the titanium dioxide by-product ferrous sulfate in 12m 3 Dissolve in the dissolution tank, control the reaction temperature at 60-95°C, the concentration of ferrous sulfate heptahydrate at 300-450g / L, add flocculant, stir, filter the solution to remove titanium dioxide and other solid impurities in the solution, and the pH of the filtrate 1.1 to 1.3. Put the above-mentioned filtrate into the ferrous sulfate preparation pool, add iron sheet, in order to reduce the Fe in the waste secondary ferrous sulfate of titanium white 3+ , wherein, every refined 1m in the ferrous sulfate reaction tank 3 The amount of iron sheet required for the ferrous sulfate solution is 0.2t, and the reaction time is 2 to 3 hours. After filtration, the refined ferrous sulfate solution required for seed crystal preparation can be obtained. Among them, the filter residue filtered for the first time is used for titanium dioxide recycling, and the filter residue filtered...

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Abstract

The invention relates to a method for preparing an iron oxide yellow pigment by using a titanium white by-product of ferrous sulfate. The preparation method comprises the steps of: refining of the ferrous sulfate, preparation of seed crystal, oxidation synthesis, filteration, water washing, drying and crushing; and the oxidation synthesis specifically comprises the processes of: putting ferrous sulfate yellow seed crystal into an oxidation reaction barrel, heating up to 60-90 DEG C and preserving the temperature, controlling the pH value of a whole reaction system to be 2.5-4, simultaneously adding a refined ferrous sulfate solution, and maintaining the concentration of iron vitriol of the whole reaction system to be 50-65g / L, wherein the whole oxidation reaction time is 80-120h. Because the pH value of the whole oxidation synthesis reaction system changes stably and particles in the reaction system are uniform in size, the prepared iron oxide yellow pigment has uniform particles and good hue.

Description

technical field [0001] The invention relates to a method for preparing iron oxide yellow pigment from titanium dioxide by-product ferrous sulfate. Background technique [0002] Titanium dioxide is a high-grade high-quality white pigment. At present, my country mainly adopts the sulfuric acid method to produce titanium dioxide, which produces about 4 tons of ferrous sulfate per ton of titanium dioxide. According to statistics, the output of titanium dioxide in 2009 reached 1.05 million tons, and the output of waste paraferrous sulfate reached 4.2 million tons. Such a large amount of waste by-products (waste by-product ferrous sulfate), if the original accumulation method is still used, the large site occupied and the impact on the environment will seriously restrict the development of the titanium dioxide industry. Although in the past there were also people who used titanium dioxide waste secondary ferrous sulfate as iron catalyst, water purifier, feed additive, soil impro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/06
Inventor 姚佐胜钱煜胡德祥张峦曹昌兵章志海
Owner TONGLING RELY TECH
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