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Tianjin Yuantai Derun Pipe Manufacturing Group Co., Ltd., established in March 2002, is the biggest manufacturer specializing in  ERW square&rectangular tube/pipe, hollow section structure pipe, galvanized pipe and spiral welding pipe in China. Annual output reaches 5 million tons.Yuantai Derun has 59 production lines of black ERW pipe, 10 production lines of galvanized pipe and 3 production lines of spiral welding pipe. Square pipe from 20*20*1mm to 500*500*40mm, rectangular pipe from 20*30*1.2mm to 400*600*40mm,  welded pipe from 2”—60” can be manufactured. Yuantai Derun can manufacture square rectangular pipes as per the standards of ASTM A500, JIS G3466, EN10219, DIN2240, BS1387, AS1163.

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January 1993

Key team members of Yuantai Derun group began technical job in Tianjin Daqiuzhuang tube factory.

June 2002

Tianjin Yuantai Industry & Trade Co., Ltd. was founded, specialize in square, rectangular hollow steel pipe, hot galvanized welded (hot dip galvanized) square tube, the registered capital is USD 10 million.

May 2004

One of Yuantai subsidiaries Tangshan Lituo Steel Tube Co., Ltd. was established, specialize in square rectangular straight welded hollow steel pipe, registered capital is USD 10 million.

April 2005

Yuantai Steel Square Pipe Co. Ltd. was established, specialize in square welding hollow steel tube and galvanized tube, the registered is USD 2 million.

March 2010

Tianjin Yuantai Runxiang commercial trade company was established, specialize in strip steel trade, galvanized pipe agent, etc., the registered capital is USD 2 million.

March 2010

Tianjin Yuantai Derun pipe manufacturing group Co. Ltd. was formally established, marking that the production of high-frequency welded black, galvanized square pipe, spiral welded pipe, pipe logistics and pipe trade as one of the large-scale joint enterprise Yuantai Derun group was formally established, the group registered capital is USD 20 million.

March 2010

Tianjin Yuantai Derun Investment Co., Ltd. was formally established, specialize in steel pipe industry chain,lower industry mergers and acquisitions and industrial real estate development, the registered capital is USD 2 million.

August 2013

Tianjin Derun Runfeng pipe manufacturing Co. Ltd was established, specialize in hot galvanized (hot galvanizing) processing business, the registered capital is USD 8 million.

March 2015

Tianjin Yuantai Yuanda anti-corrosion insulation pipe Co., Ltd. was established, specialize in spiral welded pipe production and sales, the registered capital is USD 2 million.

August 2015

Tangshan Yuantai Derun Pipe Co., Ltd. was established, specialize in steel strip, steel pipe trade, registered capital is USD 1 million.

March 2016

Tianjin Yuantai Derun International Trade Co., Ltd was established,mainly engaged in international import and export business for Yuantai Group, registered capital is USD 2 million.

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Precautions for Rectangular Tube Acid Recovery-news-TIANJIN YUANTAI DERUN PIPE MANUFACTURING GROUP CO., LTD-
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Precautions for Rectangular Tube Acid Recovery
Precautions for Rectangular Tube Acid Recovery

What are the precautions for acid recovery of rectangular tube?

1. Whereabouts of regeneration acid

Since acid recovery technology has been used in recent years, many design units have not designed regenerated acid recovery devices in the square tube production process. How to digest the residual acid in the waste pickling liquid after recovery, especially the whereabouts of various mixed acids, is the first issue that enterprises must consider.

2. Characteristics of various mixed acid waste pickling solutions

Environmental treatment usually adopts alkali neutralization method for waste acid solution to change the pH value of the solution to achieve neutrality. The disadvantages of using milk of lime to treat ordinary waste pickling liquid are not easy to appear, and there are no other technical problems except waste of cost. And many kinds of mixed acid waste liquids are different. The pollution of single acid waste liquid is only PH and Fe, while many kinds of mixed acid waste pickling liquids have F, P, NOx anions and chromium, nickel, zinc, etc. in addition to PH and Fe metal ions. For special ions, some pre-processing equipment needs to be added to the production process of rectangular tube.

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3. Wastewater treatment

Some companies believe that as long as the pH value of the waste pickling solution is neutral, it can replace sewage treatment, and some companies require comprehensive treatment by mixing degreasing wastewater, waste acid solution, flushing wastewater, and emulsion together. These treatment processes are not feasible. The acid recovery technology and equipment are only a link in the treatment process of industrial wastewater produced by rectangular tube, and cannot replace the entire enterprise wastewater treatment.

4. Characteristics of single-acid waste pickling solution for metal products

The pickling waste liquid of metal products has a single component, which is mainly the material of the metal product itself and the added elements of the material. Therefore, the salt composition in the waste liquid is not too complicated, most of the metal ions are divalent ions, the separation "effect" is obvious, and no more pretreatment equipment is needed.