Method for producing iron oxide yellow and iron oxide red by using waste hydrochloric acid solution

A technology of iron oxide yellow and iron oxide red, which is applied in the direction of iron oxide/iron hydroxide, iron oxide, etc., can solve problems such as obstacles to sustainable economic development, and achieve good coloring, authentic and bright colors

Inactive Publication Date: 2015-04-15
天津市大港华明化工厂
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Problems solved by technology

If the hydrochloric acid waste liquid problem cannot be fundamentally controll

Method used

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Embodiment 1

[0016] Step 1: Refining the waste acid solution: Take the waste acid solution from the steel plant, adjust the pH to 1-2, add a certain amount of scrap iron sheet, control the temperature at 50-70 degrees, hydrolyze for 18-24 hours, and detect that the pH value is 3.5-4 Between, and after no longer changing, stop the reaction, add flocculant, fully stir, refine for more than 24h, take the supernatant to get the ferrous chloride solution;

[0017] Step 2 seed crystal preparation: put the ferrous chloride solution, liquid caustic soda and water obtained in step 1 into the seed crystal tank, control the temperature at 20-30 degrees, and the pH value at 6.5-7.5, so that the ferrous chloride initially undergoes oxidation reaction, Generate a small amount of iron oxide nuclei;

[0018] Step 3 Oxidation reaction: pump the crystal nucleus into the oxidation tank, put in the iron sheet and water, and use 3m 3 / s into the compressed air for 30-40 hours, so that ferrous chloride is full...

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Abstract

The invention provides a method for producing iron oxide yellow and iron oxide red by using a waste hydrochloric acid solution. The method comprises the following steps: 1, purifying the waste hydrochloric acid solution: taking a steel waste acid solution, adjusting the pH value, adding a certain amount of waste sheet iron, carrying out controlled temperature hydrolysis for 18-24h, adding a flocculating agent, standing for above 24h, and taking the obtained supernatant; 2, preparing crystal seeds: adding the solution obtained in step 1, liquid alkali and water into a crystal seed tank, controlling the temperature and the pH value, and carrying out a preliminary oxidation reaction on ferrous chloride to generate a small amount of iron oxide nuclei; 3, carrying out an oxidation reaction: pumping the nuclei into an oxidation tank, adding sheet iron and water, and introducing compressed air to fully oxidize in order to generate iron oxide crystals on the nuclei; 4, processing byproducts; and 5, carrying out purifying post-treatment. A raw material used in the invention is the steel cleaning hydrochloric acid waste liquid, and is processed to generate useful products comprising iron oxide red and iron oxide yellow, so the waste is changed to valuables. Pigments produced through the method have the advantages of good staining degree, pure and right color, and good client feedback.

Description

technical field [0001] The invention relates to the field of preparation methods of pigments, in particular to preparation methods of iron oxide yellow and iron oxide red. Background technique [0002] The main components of iron oxide red and iron oxide yellow are ferric oxide, but iron oxide yellow has more crystal water. Both are commonly used pigments in the building materials industry, various coatings, and coloring of plastic products, such as Thermosetting plastics and thermoplastics, and the coloring of rubber products, such as automobile inner tubes, aircraft inner tubes, bicycle inner tubes, etc., are widely used. [0003] The existing preparation methods include ferrous sulfate oxidation method, aromatic nitro oxidation method, etc. With the continuous advancement of technology, the aromatic nitro oxidation method is gradually abandoned because it involves aromatic groups. The ferrous sulfate oxidation method is the mainstream preparation method. The source of fe...

Claims

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Application Information

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IPC IPC(8): C01G49/06
Inventor 王德勇
Owner 天津市大港华明化工厂
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