Environment friendly acid solution for removing copper sheets on titanium and titanium alloy extruded tube blanks

A titanium alloy and extruded tube technology, which is applied in the field of environment-friendly acid solution, can solve the problem that it is not suitable for transformation and utilization, cannot take into account the requirements of oil removal and pickling, and does not remove titanium and titanium alloy extruded tube blank copper skin pickling process, etc. problems, to achieve the effect of increasing economic benefits and inhibiting the production of toxic gases

Inactive Publication Date: 2013-02-13
NINGXIA ORIENT TANTALUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But it is not suitable for the transformation and utilization of existing traditional production lines, nor can it take into account the requirements of degreasing and pickling of titanium and titanium alloy seamless pipe semi-finished products and finished products
[0010] "Research on the Recovery of Gold and Copper from Printed Circuit Board Scraps" was published by Zhu Pingfa in the journal "Rare Metals" in 2002. The method is: hydrogen peroxide + sulfuric acid + water to recover copper from printed circuit board scraps, and the recovery rate of copper Up to 99.43%, but there is no report on the pickling process for removing the copper skin of titanium and titanium alloy extruded tube blanks

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The ratio of acid solution is: 5% H 2 o 2 , 5% HNO 3 , 10%H 2 SO 4 , remaining water, in mass percent. After 90 minutes of test reaction, there are still some point-shaped copper skins that have not been completely reacted, and the reaction speed is relatively slow. After placing the tube blank for a certain period of time, the pickling can be completed, and the copper skin can be removed to reveal the true color of the metal.

Embodiment 2

[0027] The ratio of acid solution is: 7% H 2 o 2 , 10% HNO 3 , 15%H 2 SO 4 , remaining water, in mass percent. 9 pieces of φ70×6×510mm tube blanks, pickling in a small acid tank, the recycling of acid liquid can be determined by calculation, and increasing the amount of tube blanks will not affect the reaction rate, the reaction is completed within 60 minutes, and pickling is achieved Requirements, there is no visible copper skin on the inner and outer surfaces, revealing the true color of the metal.

Embodiment 3

[0029] The lower ratio in the process is adopted: 5% H 2 o 2 , 7% HNO 3 , 15%H 2 SO 4 , remaining water, in mass percent. The dimensions of the acid tank are: length: 16 meters, width: 1 meter, height: 1.5 meters. The height of the acid solution is only required to meet the production needs, about 0.4 meters. According to the concentration of the acid used: 27.5% H 2 o 2 , 98% HNO 3 , 98%H 2 SO 4 , the volume ratio is: sulfuric acid: nitric acid: hydrogen peroxide: water = 8.3: 4.9: 16.4: 59.4, prepare acid solution. The specifications of the added pipes are φ72×7×2000-3000mm, 37 pieces; the pickling time is nearly 3 hours. Operators need to wear protective masks and respirators. During the reaction process of nearly 3 hours, the reaction speed was stable, there was no violent reaction, and there was no staged reaction stop.

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Abstract

The invention relates to an environment friendly acid solution for removing copper sheets on titanium and titanium alloy extruded tube blanks. The environment friendly acid solution for removing the copper sheets on the titanium and titanium alloy extruded tube blanks is characterized by comprising the following raw materials in percentage by mass: 15-20% of H2SO4, 5-10% of HNO3, 5-10% of H2O2 and the balance of water. By using the environment friendly acid solution for removing the copper sheets on the titanium and titanium alloy extruded tube blanks, provided by the invention, the using amount of the nitric acid is reduced, the using amount of the hydrogen peroxide is increased, brownish red nitric oxide (NO2) as a poisonous gas is prevented from being generated, and excessive cupric ions and nitrate ions are prevented from being generated, and waste gases and waste solutions can meet environment friendliness requirements, so that the environment friendly acid solution has a practical application value; and meanwhile, the economic benefit is increased by recovery of copper sulfate crystal substances, so that the environment friendly acid solution can be widely used by enterprises adopting the conventional technique (sulfuric acid and nitric acid, water or nitric acid and water) through slightly changing the conventional technique and equipment.

Description

technical field [0001] The invention relates to the technical field of non-ferrous metal production, in particular to an environment-friendly acid solution for removing the copper coating of titanium and titanium alloy extruded tube blanks. Background technique [0002] Titanium belongs to group IVB in the periodic table of chemical elements, and its atomic number is 22. Titanium is a rare light metal with low density and high specific strength, and can form a thin and strong oxide film in an oxidizing environment with excellent corrosion resistance. In addition, it also has the characteristics of non-magnetic, small linear expansion coefficient and so on. Titanium and titanium alloys were first applied as important aerospace structural materials, and then extended to shipbuilding, chemical industry and other fields, and developed rapidly. Conventional semi-finished products and finished products of titanium and titanium alloys include ingots, bars, plates, strips, pipes (...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F1/18
Inventor 任丽萍朱宝辉刘守田李陈鞠顺巴万兴李兴利
Owner NINGXIA ORIENT TANTALUM IND
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