Method for producing ferric chloride by using pickle liquor

A technology of pickling waste liquid and ferric chloride, which is applied in the direction of ferric halide, can solve the problems of high cost, large equipment investment, secondary pollution, etc., and achieve the effect of low production cost, safe operation and low investment

Inactive Publication Date: 2013-05-01
梁锡明
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The invention provides a method for producing ferric chloride by using pickling waste liquid, which utilizes hot-dip galvanizing pickling waste liquid or iron and steel industry pickling waste liquid, controls reasonable process parameters, and solves the problems in the existing ferric chloride production. problems, especially in the process of using waste acid to produce ferric chloride, the process control is unreasonable, the cost is high, the quality of ferric chloride produced is low, and the investment in equipment is large, which will cause secondary pollution.

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  • Method for producing ferric chloride by using pickle liquor
  • Method for producing ferric chloride by using pickle liquor

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Embodiment 1

[0047] A method for producing ferric chloride by utilizing pickling waste liquor, is characterized in that, comprises the following steps:

[0048] (1) According to the iron content and hydrochloric acid content of the pickling waste liquid, add iron filings and soak for 32 hours to fully react the hydrochloric acid in the waste liquid;

[0049] (2) After soaking, pass chlorine gas to oxidize. Oxidation is carried out in a closed reaction kettle, each kettle is 5 tons, the temperature is controlled at 50~60℃, the flow rate of chlorine gas: 60~80kg / hour, the pressure control: 0.05~0.1MPa, and the time is 1h, oxidize the ferrous ions in the solution to ferric ions;

[0050] (3) After the oxidation reaction is finished, add iron filings so that the total iron content per ton of hot washing waste liquid is 130kg, control the temperature at 30-40°C, and soak for 24 hours;

[0051] (4) After soaking, pass chlorine gas to oxidize. Oxidation is carried out in a closed reaction kettle...

Embodiment 2

[0054] A method for producing ferric chloride by utilizing pickling waste liquor, is characterized in that, comprises the following steps:

[0055] (1) According to the iron content and hydrochloric acid content of the pickling waste liquid, add iron filings and soak for 48 hours to fully react the hydrochloric acid in the waste liquid;

[0056] (2) Pass chlorine gas to oxidize after immersion. Oxidation is carried out in a closed reaction kettle with 5 tons per kettle. 3h, the divalent iron ions in the solution are oxidized to ferric ions;

[0057] (3) After the oxidation reaction is finished, add iron filings so that the total iron content per ton of pickling waste liquid is 135kg, control the temperature at 30-40°C, and soak for 24 hours;

[0058] (4) After soaking, pass chlorine gas to oxidize. Oxidation is carried out in a closed reaction kettle, each kettle is 5 tons, the temperature is controlled at 50~60℃, the flow rate of chlorine gas: 60~70kg / hour, the pressure cont...

Embodiment 3

[0061] A method for producing ferric chloride by utilizing pickling waste liquor, is characterized in that, comprises the following steps:

[0062] (1) According to the iron content and hydrochloric acid content of the pickling waste liquid, add iron filings and soak for 60 hours to fully react the hydrochloric acid in the waste liquid;

[0063] (2) Pass chlorine gas to oxidize after immersion. Oxidation is carried out in a closed reaction kettle with 5 tons per kettle. 3h, the divalent iron ions in the solution are oxidized to ferric ions;

[0064] (3) After the oxidation reaction is finished, add iron filings so that the total iron content per ton of pickling waste liquid is 140kg, control the temperature at 30-40°C, and soak for 24 hours;

[0065] (4) After soaking, pass chlorine gas to oxidize. Oxidation is carried out in a closed reaction kettle, each kettle is 5 tons, the temperature is controlled at 50~60℃, the flow rate of chlorine gas: 60~70kg / hour, the pressure cont...

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Abstract

The invention relates to a method for producing ferric chloride by using pickle liquor. The method comprises the following steps of: (1) replenishing scrap iron according to the iron content of the pickle liquor, and soaking; (2) after soaking, introducing chlorine gas for oxidizing ferrous ions in a solution into ferric ions; (3) after an oxidizing reaction is completed, replenishing scrap iron till the total iron content of every ton of pickle liquor is 130-140kg, and soaking; (4) after soaking, introducing chlorine gas for oxidizing ferrous ions in the solution into ferric ions; and (5) after an oxidizing reaction is completed, when the concentration of the solution is more than 43 Baume degree, inspecting qualification according to a GB / T1621-2008 standard to obtain liquid ferric chloride. Finished ferric chloride produced with the production method disclosed by the invention has the advantages of good quality, safe operation, no energy consumption, 100 percent application of waste acids, prevention of secondary pollution, realization of zero emission of three wastes, small investment and low production cost.

Description

technical field [0001] The invention relates to a method for producing ferric chloride, in particular to a method for producing ferric chloride by using pickling waste liquid. Background technique [0002] Ferric chloride, also known as ferric chloride, is mainly used as a treatment agent for drinking water and wastewater, as an oxidant and mordant in the dye industry, as a catalyst and oxidant for organic synthesis, and as an etchant in the electronics industry. [0003] Generally, there are three main methods for producing ferric chloride: high temperature chlorination, hydrochloric acid chlorination and one-step chlorination. The high-temperature chlorination method is to react iron filings with chlorine gas at about 600°C, and the anhydrous product is obtained by this method. The hydrochloric acid chlorination method is to react iron filings with hydrochloric acid to first generate FeCl 2 , and then chlorinated with chlorine gas. The one-step chlorination method is to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/10
Inventor 梁锡明
Owner 梁锡明
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