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Method for recycling zinc ferrite solution

A technology of zinc-ferric acid and ferric acid, which is applied in chemical instruments and methods, water/sludge/sewage treatment, water pollutants, etc., can solve the problem of intensifying the reaction of iron-zinc alloys, reducing the adhesion between the coating and the substrate of the coating, etc. problems, to achieve the effect of wide source of raw materials and simple process

Pending Publication Date: 2020-06-23
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, the process of forming zinc slag intensifies the alloy reaction between iron and zinc, which will reduce the adhesion between the coating and the substrate of the coating.

Method used

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  • Method for recycling zinc ferrite solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036]The situation of zinc-ferric acid solution produced by a galvanizing plant is as follows: 10 cubic meters per day, pH is 0.1, total iron concentration is 56g / L, and zinc concentration is 9g / L.

[0037] The concrete steps of this zinc-ferric acid solution reuse are:

[0038] Step S0: Collect the zinc-ferric acid solution into the homogeneous tank for mixing, and mix thoroughly to keep the water quality stable.

[0039] Step 1: Send the zinc-ferric acid solution in the homogeneous tank into the oxidation tank, open the dosing tank, and automatically control the hydrogen peroxide with a mass concentration of 10% from the dosing tank to the oxidation tank for oxidation through the automatic control valve. The molar ratio of content is 4:1, and the flow rate is controlled at 0.2m 3 / h. The oxidation reaction time at the end of dosing was 130min.

[0040] Step 2: After the oxidation reaction is completed, send the oxidized zinc-ferric acid solution into the primary sediment...

Embodiment 2

[0044] The situation of zinc-ferric acid solution produced by a galvanizing plant is as follows: 40 cubic meters per day, pH is 1, total iron concentration is 34g / L, and zinc concentration is 5g / L.

[0045] The concrete steps of this zinc-ferric acid solution reuse are:

[0046] Step S0: Collect the zinc-ferric acid solution into the homogeneous tank for mixing, and mix thoroughly to keep the water quality stable.

[0047] Step 1: Send the zinc-ferric acid solution in the homogeneous tank into the oxidation tank, open the dosing tank, and automatically control the hydrogen peroxide with a mass concentration of 35% from the dosing tank to the oxidation tank for oxidation through the automatic control valve. The molar ratio of content is 3:1, and the flow rate is controlled at 0.2m 3 / h. The oxidation reaction time at the end of dosing was 90 minutes.

[0048] Step 2: After the oxidation reaction is completed, send the oxidized zinc-ferric acid solution into the primary sedim...

Embodiment 3

[0052] The situation of zinc-ferric acid solution produced by a galvanizing plant is as follows: 30 cubic meters per day, pH is 1, total iron concentration is 19g / L, and zinc concentration is 8g / L.

[0053] The concrete steps of this zinc-ferric acid solution reuse are:

[0054] Step S0: Collect the zinc-ferric acid solution into the homogeneous tank for mixing, and mix thoroughly to keep the water quality stable.

[0055] Step 1: Send the zinc-ferric acid solution in the homogeneous tank into the oxidation tank, open the dosing tank, and automatically control the hydrogen peroxide with a mass concentration of 50% from the dosing tank to the oxidation tank for oxidation through the automatic control valve. The molar ratio of the content is 2.5:1, and the flow rate is controlled at 0.3m 3 / h. The oxidation reaction time at the end of dosing was 80 minutes.

[0056] Step 2: After the oxidation reaction is completed, send the oxidized zinc-ferric acid solution into the primary...

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Abstract

The invention belongs to the field of waste liquid recycling, and provides a method for recycling a zinc ferrite solution. According to the method, hydrogen peroxide or ozone is added into the zinc ferrite solution, so that the hydrogen peroxide or ozone and metal in the zinc ferrite liquid form Fenton and a Fenton-like reaction to generate OH., and low-valent iron ions in the zinc ferrite solution are oxidized into ferric ions while various organic matters in the zinc ferrite liquid are oxidized. The ammonia water is added to adjust the pH value, ferric ions are made to generate ferric hydroxide, and finally iron mud is obtained through precipitation. The steps of stirring and washing are carried out on the iron mud by adopting a hydrochloric acid solution, zinc ions are washed, and the iron mud is purified, so that the iron mud has a certain recovery value, and meanwhile, zinc lost due to mud-water separation is reduced. The recycled water composed of a supernatant and the washing liquid meets the requirement for matching and recycling of the plating assistant agent, and discharging is not needed. Therefore, according to the method for recycling the zinc ferrite solution, zinc recycling is achieved, iron mud is recycled, and two purposes are achieved at a time.

Description

technical field [0001] The invention belongs to the field of waste liquid recovery and utilization, and in particular relates to a method for recycling zinc-ferric acid liquid. Background technique [0002] Galvanizing refers to the anti-rust method of spreading metal zinc on the surface of iron or steel. Zinc is a metal with high corrosion resistance. It can isolate iron from oxygen and water, so that iron cannot undergo the chemical reactions required for rust; because zinc has higher metal mobility than iron, even if the zinc plated is damaged , zinc still prevents rust in an electrochemical way with sacrificial protection. The methods of galvanizing mainly include hot dip galvanizing (HDG), electro galvanizing (EG) and cold galvanizing. [0003] Pickling and rust removal is a very important process link in the galvanizing process. Whether a good surface quality of the workpiece to be plated can be obtained, and how to improve the quality and reduce consumption in the g...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F101/20
CPCC02F1/722C02F1/78C02F1/66C02F1/5236C02F2101/203C02F2101/20
Inventor 时鹏辉王鹏飞郭灏戴磊唐梦阳刘灿聂文龙张之赟李世吉支慧王梦媛张雪枫杨玲霞范金辰闵宇霖徐群杰
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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