Method for preparing ferric oxide yellow pigment by waste iron hydrochloric acid lotion

A technology of iron oxide yellow and hydrochloric pickling, which is applied in chemical instruments and methods, inorganic pigment treatment, fibrous fillers, etc., to achieve accelerated oxidation rate, low material cost and energy consumption cost, and improved tinting strength and adhesion. Effect

Inactive Publication Date: 2010-02-17
ZHEJIANG UNIV
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  • Claims
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Problems solved by technology

The process should meet the following requirements: first, the oxidation treatment capacity meets the daily throughput requirements of the raw material waste ferric acid solution, the secondary discharge of wastewater meets the discharge requirements stipulated by the state, and the treatment cost should be reduced as much as possible; second, the obtained iron yellow product , although its quality is not required to meet the high quality requirements of the special-grade iron yellow provided by professional manufacturers of iron yellow, but these iron yellow pigments equivalent to industrial grades can still meet the basic requirements of general construction and coating industries

Method used

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  • Method for preparing ferric oxide yellow pigment by waste iron hydrochloric acid lotion

Examples

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Effect test

Embodiment 1

[0026] Take 20mL of waste iron hydrochloric acid solution (pH is -1.12, iron content 50g / L, hereinafter referred to as the raw material solution) from the iron and steel plant, stir, filter, and adjust the pH to 2.5 with caustic soda solution, the raw material solution changes from golden yellow to light yellow slightly With brown color, let it stand for 1 hour to obtain the treated raw material solution without precipitation or suspension generation;

[0027] The treated raw material solution was transferred into a 250mL three-necked flask, and 7.2mL of 25% ammonia water was added to neutralize the strong acidity and further generate a dark blue precipitate with a pH of 7.68. Stir and control the temperature to 25°C, add 0.12mL of 5% sodium hypochlorite solution with mass concentration, and flow air with a flow rate of 0.5L / min from the bottom to ensure full contact of the gas-liquid-solid three-phase in the entire reactor. As the reaction progresses, the pH value of the syst...

Embodiment 2

[0032] Take 20mL of waste iron hydrochloric acid solution (pH is -1.22, iron content 40g / L) from the machinery manufacturing industry, stir, filter, adjust the pH to 2.8 with ammonia water, the raw material solution changes from golden yellow to light yellow and slightly brown, and let it stand After 1 hour, the treated raw material solution was obtained without precipitation or suspended solids;

[0033] Transfer the treated raw material solution into a 250mL three-necked flask, add 8mL 25% ammonia water to neutralize the strong acidity and further generate a dark blue precipitate, the pH is 7.39, stir and control the temperature to 20°C, add 0.12mL mass concentration 5 % sodium hypochlorite solution. Air with a flow rate of 0.4 L / min was introduced from the bottom. As the reaction progressed, the pH value of the system gradually decreased. When more solid slurry was formed and stirring was difficult, add 15 mL of distilled water. When the pH of the reaction system is 5.5, s...

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Abstract

The invention discloses a method for preparing ferric oxide yellow pigment by waste iron hydrochloric acid lotion, which adopts a wet oxidation method. The method comprises the following steps: processing the waste iron hydrochloric acid lotion; preparing a crystal seed; fading red; carrying out two-step oxidation; pressing and filtering; and drying. The method can rapidly and simply process the waste iron hydrochloric acid lotion with lower ferrous concentration, more impurity iron content and higher acidity, which is discharged by industries, such as metallurgy, steel, machinery, chemistry,pharmacy, and the like, the waste iron hydrochloric acid lotion can reach the Chinese allowed discharge standard, and the ferric oxide yellow pigment which can be used for industries, such as construction, paint, and the like is prepared.

Description

technical field [0001] The invention relates to a method for preparing iron oxide yellow pigment from waste iron hydrochloric acid washing solution. Background technique [0002] Iron oxide yellow pigments are widely used inorganic color pigments. Iron oxide yellow is iron oxide hydrate, and its shade ranges from lemon yellow to orange yellow to brown. The powder is fine and is crystalline iron oxide hydrated gel. It has the advantages of good light resistance, good dispersibility, strong hiding power, no bleeding, high stability, non-toxic, low cost, etc., and can strongly absorb ultraviolet rays and visible blue spectrum, so it has the function of shielding radiation and prolonging the service life of the coating role. Iron yellow pigment has general heat resistance and is widely used in construction, ink, rubber, paper and other industries. [0003] The production of iron oxide yellow pigment mainly adopts wet precipitation oxidation method, and its process mainly inc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/24C09C3/06C09C3/08C09C3/04
Inventor 杨文平丁靓吴韬王琦
Owner ZHEJIANG UNIV
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