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Method for producing iron oxide black by using waste hydrochloric acid solution

A technology of iron oxide black and waste hydrochloric acid, which is applied in the field of pigment preparation, can solve problems such as obstacles to sustainable economic development, and achieve the effects of strong tinting power, improved product purity and yield, and positive color

Inactive Publication Date: 2015-04-15
天津市华创盛达科技有限公司
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  • Abstract
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AI Technical Summary

Problems solved by technology

If the hydrochloric acid waste liquid problem cannot be fundamentally controlled, it will definitely hinder the sustainable development of the local economy

Method used

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Effect test

Embodiment 1

[0018] 1. Refining of 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;

[0019] 2. Put in liquid caustic soda, according to the amount of ferrous chloride material 2:1 feeding, can control the liquid caustic soda slightly excessive, control temperature 20-30 degrees, pH value 6.5-7.5, fully react, filter, collect precipitation;

[0020] 3, will react with the product obtained in step 2 with the iron oxide yellow of the amount 1:1 of ferrous hydroxide substance, obtain the black thick product of iron oxide;

[0021] 4. Refining: filter and wash the obtained iron oxide black coarse product, dry it with steam, raise the t...

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Abstract

The invention provides a method for producing iron oxide black by using a waste hydrochloric acid solution. The method comprises the following steps: 1, purifying the waste hydrochloric acid solution: taking the waste hydrochloric acid solution of a steel plant, adjusting the pH value, adding a certain amount of waste sheet iron, carrying out controlled temperature hydrolysis, adding a flocculating agent after the above reaction is stopped, fully stirring, and taking the obtained supernatant to obtain a ferrous chloride solution; 2, adding liquid alkali, controlling the temperature in a range of 20-30DEG C and the pH value in a range of 6.5-7.5, fully reacting, filtering, and collecting the obtained precipitate; 3, reacting iron oxide yellow having a same mole with ferrous hydroxide with a product obtained in step 2 to obtain crude iron oxide black; and 4, purifying. The method uses the waste hydrochloric acid solution of the steel plant and uses recovered iron oxide red and iron oxide yellow to realize wastewater treatment precipitation, so the method realizes waste reuse, energy saving and environmental protection; and a product obtained through the method has strong coloring power, pure color, and increased purity and yield.

Description

technical field [0001] The invention relates to the field of preparation methods of pigments, in particular to a preparation method of iron oxide black. . Background technique [0002] Ferric oxide, chemical formula Fe 3 o 4 , alias iron oxide black, magnet, magnet, is a black crystal with magnetic properties, so it is also called magnetic iron oxide. Usually used as pigments and polishes, it can also be used in the manufacture of audio tapes and telecommunications equipment. Ferroferric oxide has ferromagnetism. If the particle radius is at the nanometer level, it is called ferroferric oxide magnetic particles. In recent years, the research on the preparation method and application of nanometer ferroferric oxide has become increasingly hot, and better production process exploration is needed. . [0003] There are many large-scale iron and steel enterprises near the applicant's residence, because cleaning steel will produce a large amount of untreated waste hydrochloric...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/08
Inventor 王德勇
Owner 天津市华创盛达科技有限公司
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