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Preparation method of polyferric chloride solid and polyferric chloride solid

A polyferric chloride, solid technology, applied in the field of chemistry, can solve the problems of instability, low polyferric chloride content, expensive transportation costs and the like

Active Publication Date: 2018-01-09
TANGSHAN 3R CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, the content of polyferric chloride in liquid preparations is low and unstable. On the other hand, the expensive transportation costs of liquid preparations limit the scope of use of polyferric chloride liquids, making the market urgently demand high-content, stable and easy-to-transport polychloride. Iron oxide solid

Method used

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  • Preparation method of polyferric chloride solid and polyferric chloride solid
  • Preparation method of polyferric chloride solid and polyferric chloride solid
  • Preparation method of polyferric chloride solid and polyferric chloride solid

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preparation example Construction

[0022] For example, a kind of preparation method of polyferric chloride solid comprises the steps of: adjusting Fe in hydrochloric acid pickling waste liquid 2+ The molar ratio with HCl is (3.5~8.0):1, adjust Fe in the hydrochloric acid pickling waste liquid 2+ The content is 12% to 15%, and a stabilizer is added to obtain a raw material liquid; under a preset pressure and within a preset temperature range, sodium nitrite and oxygen are added to the raw material liquid, and polychloride is obtained after sufficient reaction. ferric chloride solution; the polyferric chloride solution is spray-dried to obtain a polyferric chloride solid.

[0023] In order to further illustrate the preparation method of the above-mentioned polyferric chloride solid, another example is, please refer to figure 1 , the preparation method of polyferric chloride solid comprises the steps:

[0024] S110: Adjust Fe in hydrochloric acid pickling waste liquid 2+ The molar ratio with HCl is (3.5~8.0):1,...

Embodiment 1

[0063] (1) Ratio of the whole material: adding industrial hydrochloric acid and or solid FeCl 2 Adjust Fe in hydrochloric acid pickling waste liquid 2+ The molar ratio with HCl is 3.5:1 and the ferrous ion content is adjusted to be 13.8%. Phosphoric acid is added and the molar ratio of P and Fe is adjusted to be 0.03:1 to obtain a raw material solution.

[0064] (2) Preparation of polyferric chloride liquid by catalytic oxidation: the raw material liquid is transported in the oxidation reactor, the catalyst sodium nitrite solution is intermittently added from the top of the reactor, the sodium nitrite addition is 0.27% of the total mass of the raw material liquid, and the oxidant oxygen Feed in from the middle of the reactor, control the internal pressure of the reactor to 0.08MPa, and the reaction temperature to 70°C, so that all the ferrous iron in the material is oxidized to ferric ions, and a polyferric chloride solution is obtained. The tail gas produced by the reaction ...

Embodiment 2

[0067] Add industrial hydrochloric acid and / or solid FeCl 2 Adjust Fe in hydrochloric acid pickling waste liquid 2+ The molar ratio with HCl is 5.5:1, and the others are the same as in Example 1. Polyferric chloride solid B is obtained.

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Abstract

The invention relates to a preparation method of a polyferric chloride solid and the polyferric chloride solid. The preparation method of the polyferric chloride solid includes the following steps: the molar ratio of Fe<2+> to HCl in hydrochloric acid pickling waste liquor is regulated to (3.5 to 8.0) to 1, the Fe<2+> content in the hydrochloric acid pickling waste liquor is regulated to 12 to 15percent, a stabilizer is added, and thereby a feed solution is obtained; under preset pressure, within a preset temperature range, sodium nitrite and oxygen are added into the feed solution, and aftersufficient reaction, a polyferric chloride solution is obtained; and the polyferric chloride solution undergoes spray-drying operation, so that the polyferric chloride solid is obtained. The preparation method of the polyferric chloride solid can utilize the hydrochloric acid pickling waste liquor to prepare the polyferric chloride solid, so that resource waste can be reduced. Since the polyferric chloride solution prepared from the hydrochloric acid pickling waste liquor undergoes spray-drying operation to obtain the polyferric chloride solid, the polyferric chloride content in the polyferric chloride solid is high and relatively stable, and the polyferric chloride solid is easy to store and transport.

Description

technical field [0001] The invention relates to the technical field of chemistry, in particular to a preparation method of a polyferric chloride solid and the polyferric chloride solid. Background technique [0002] In the production process of steel and metal processing manufacturing industries, it is often necessary to use hydrochloric acid solution to pickle and derust the surface of steel products. During this process, a large amount of hydrochloric acid pickling waste will be produced. Hydrochloric acid pickling waste liquid is highly corrosive and harmful, and has been listed as hazardous waste HW34 waste acid by the national environmental protection department. It cannot be discharged directly and needs to be recycled. [0003] The traditional treatment method for waste hydrochloric acid pickling of iron and steel mainly uses alkali neutralization method to adjust the pH value of waste hydrochloric acid pickling, so that the heavy metal ions in the waste hydrochloric ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/10C02F1/00
Inventor 肖晋宜樊文星吴勇基王权永丁德才杨柳荫蓝立财张鹏
Owner TANGSHAN 3R CHEM CO LTD