Spray roasting hydrochloric acid regeneration method and system for ferric oxide powder with high specific surface area

A high specific surface area, iron oxide powder technology, applied in iron oxide, chemical instruments and methods, iron oxide/iron hydroxide, etc., can solve the problem of low BET value of iron oxide powder, improve BET value and ensure system operation , The effect of stable and controllable concentration

Pending Publication Date: 2020-02-21
WISDRI ENG & RES INC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0019] The purpose of the invention is to overcome the problem that the BET value of the iron oxide powder produced by the existing spray roasting hydrochloric acid regeneration device is on the low side

Method used

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  • Spray roasting hydrochloric acid regeneration method and system for ferric oxide powder with high specific surface area
  • Spray roasting hydrochloric acid regeneration method and system for ferric oxide powder with high specific surface area
  • Spray roasting hydrochloric acid regeneration method and system for ferric oxide powder with high specific surface area

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Embodiment 1

[0042] like figure 2 As shown, the present embodiment relates to a method for regeneration of hydrochloric acid by spray roasting, comprising the steps of:

[0043] (1) Contains FeCl 2 , FeCl 3 、H 2 All the waste acid solution of O directly enters the pre-concentrator 4 to be heated and concentrated, and after being pressurized by the pre-concentrator circulation pump 6 and the roaster feed pump 7 on the roaster feed line 8, it enters the roaster 2 in the form of high-pressure injection. Burn the waste acid at high temperature (burning temperature 650~720°C), and the following chemical reactions occur during the burning process:

[0044] 2FeCl 2 + 2H 2 O + 1 / 2O 2 = Fe 2 o 3 ↓ + 4 HCl ↑;

[0045] 2FeCl 3 + 3 H 2 O = Fe 2 o 3 ↓ + 6 HCl.

[0046] (2) The high-temperature flue gas produced by the above-mentioned roasting furnace 2 enters the pre-concentrator 4, and exchanges heat with the waste acid solution in the pre-concentrator 4 as a high-temperature heat so...

Embodiment 2

[0051] The embodiment of the present invention relates to a spray roasting hydrochloric acid regeneration method of iron oxide powder with high specific surface area, which can at least solve some problems existing in the prior art. This method is basically the same as the steps of the spray roasting hydrochloric acid regeneration method in the above-mentioned embodiment 1, and the specific steps are not repeated here; this method has been improved on the basis of embodiment 1, specifically: image 3 As shown, the waste acid solution is divided into an independent first pipeline 14 and a second pipeline 16 before entering the pre-concentrator 4, and enters the roaster 2 and the pre-concentrator 4 respectively, and the waste acid solution entering the pre-concentrator 4 is heated After being concentrated, it is mixed with the spent acid solution in the first pipeline 14 and enters the roaster 2 . Because a certain amount of unconcentrated spent acid solution has been added thro...

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Abstract

The invention provides a spray roasting hydrochloric acid regeneration method and system for ferric oxide powder with a high specific surface area. The method comprises the steps: a waste acid solution is heated and concentrated in a pre-concentrator and then is sprayed into a roasting furnace through a feeding pipeline of the roasting furnace; the generated roasting flue gas is subjected to subsequent regeneration treatment and purification treatment, the waste acid solution is divided into a first pipeline and a second pipeline which are independent before entering the preconcentrator, the waste acid solutions in the first pipeline and the second pipeline respectively enter the roasting furnace and the preconcentrator, and the waste acid solution entering the preconcentrator is heated and concentrated and then is mixed with the waste acid solution in the first pipeline, and then the mixed solution enters the roasting furnace. On the basis of not reducing the treatment capacity of a conventional spray roasting hydrochloric acid regeneration system and not increasing the energy consumption, the waste acid solution is divided into two paths to respectively enter the roasting furnaceand the pre-concentrator, and a certain amount of waste acid is added into the feeding pipeline of the roasting furnace, so that the concentration of the concentrated acid for firing in the roastingfurnace is remarkably reduced, and the purpose of increasing the BET value of the produced ferric oxide powder is achieved.

Description

technical field [0001] The invention belongs to the technical field of recovery and treatment of steel plate pickling wastewater, and in particular relates to a hydrochloric acid regeneration method and system for spray roasting iron oxide powder with a high specific surface area. Background technique [0002] Iron and steel, mechanical processing, and chemical companies generally use 18% hydrochloric acid (HCL) to remove oxidized rust on the surface of steel parts (steel coils, steel plates, steel pipes, etc.), and steel parts contain FeCl after hydrochloric acid treatment. 2 , FeCl 3 The waste acid solution of waste acid can be regenerated into hydrochloric acid solution after treatment. At present, the waste hydrochloric acid solution is generally regenerated by spray roasting process. [0003] The most important parts of the spray roasting regeneration technology can be summarized into five units: 1) chemical heat treatment; 2) pre-concentration of waste acid; 3) flue g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B7/03C01G49/06
CPCC01B7/035C01G49/06C01P2006/12
Inventor 吴宗应赵金标秦健丁煜王军郭金仓常勤学高俊峰关翔
Owner WISDRI ENG & RES INC LTD
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