Method for recycling tin and copper from waste tinned copper needles
A waste tin-plated copper and tin-plated copper technology, applied in the direction of improving process efficiency, etc., can solve the problems of complex operation, high recycling cost, long cycle, etc., and achieve the effect of simple recycling method, high recycling cost and low cost
Active Publication Date: 2015-05-13
盛隆资源再生(无锡)有限公司
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[0005] The purpose of the embodiments of the present invention is to provide a method for recovering tin and copper from waste tinned copper needles, aiming to solve the problems of high recovery cost, complicated operation and long cycle in the existing method for recovering tin and copper from tinned copper needles The problem
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Embodiment 1
[0031] Example 1: Mix 20mL of concentrated sulfuric acid and 500mL of water to form a sulfuric acid solution, add 200g (containing 3% tin) of waste tin-plated copper needles, raise the temperature to 90°C, add 16mL of hydrogen peroxide dropwise, react for 10min, filter, and bake Dry, the recovery rate of tin was 98.24%, and the recovery rate of copper was 99.14%. Add 10mL concentrated sulfuric acid to the filtrate to leach 200g waste tin-plated copper needles again, and process according to the above steps, the recovery rate of tin is 98.34%, and the recovery rate of copper is 99.05%. The filtrate is circulated 10 times, and the recovery rate of tin can be stabilized above 98%, while the recovery rate of copper is above 99%. There is no waste water discharge in the whole filtration, which is green and environmentally friendly; the cost of reagents for a single recovery of tin and copper is stable within 200 yuan / ton, and the process price is low.
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Abstract
The invention discloses a method for recycling tin and copper from waste tinned copper needles. The method includes the steps that a certain amount of sulfuric acid and water are mixed into a solution with a certain concentration, and a certain number of waste tinned copper needles are added into the solution; the solution is heated to be at needed temperature, and dripping addition of hydrogen peroxide is started; tin reacts with the hydrogen peroxide to obtain tin oxide, the tin oxide reacts with the sulfuric acid to obtain tin sulphate, and the tin sulphate is hydrolyzed to obtain sediment of tin hydroxide; after filtration is performed, copper wires and tin slime are obtained from filtrate residues, the copper wires are used for reclaimed copper smelting, and the tin slime is used for tin smelting in a tin smelting factory; a certain amount of sulfuric acid is replenished in the filtrate, and the steps from the first step to the fourth step are circulated to process new waste. According to the method, due to the fact that the solution of the sulfuric acid and the water is prepared, the tin reacts with the hydrogen peroxide to obtain the tin oxide, the tin oxide reacts with the sulfuric acid to obtain tin sulphate, the tin sulphate reacts with the sulfuric acid to obtain the sediment of the tin hydroxide, and the copper and the tin are recycled. A reagent used in the method is only water, the small amount of sulfuric acid and the hydrogen peroxide, and therefore cost is low, the copper and the tin can be lixiviated out in a circulating mode after the sulfuric acid is replenished in the filtrate, waste water discharge is avoided, and environment friendliness is achieved.
Description
technical field [0001] The invention belongs to the technical field of tin-copper recovery, in particular to a method for recovering tin and copper from waste tin-plated copper needles. Background technique [0002] In the electronics industry, tin plating on the copper surface can play a very good protective role, and at the same time, it can enhance the soldering performance of the plated object. Tin-plated copper scraps usually contain about 1-4% tin. Recycling tin and copper from such tin-containing scraps will produce objective economic benefits and reduce the pressure on environmental protection. [0003] In the early stage, the tin-plated copper scrap was mostly used for direct copper smelting without de-tinning, the recovery rate of tin was low, and when the tin content was too high, it would also affect the recovery of copper. Therefore, in order to efficiently recover the tin and Copper, now mostly adopts the method of removing tin in advance and reclaiming copper...
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IPC IPC(8): C22B7/00C22B3/44C22B15/00C22B25/06
CPCY02P10/20
Inventor 梁勇郭斗斗杨亮温葆林刘玉城靖青秀
Owner 盛隆资源再生(无锡)有限公司