| Summary: | 碩士 === 國立臺北科技大學 === 化學工程所 === 93 === Etchants are high consumption and high pollution of the printed circuit board industry; therefore this research uses the etchant for the acid copper chloride amount the high copper content in the printed circuit board industry, using the neutralization for acids and bases to prepare of the copper salt by the acid wasted etching liquid. This way is in order to reach the waste recovery and sustainable development.
Experiment uses the neutralization for acids and bases can preparation of the copper hydroxide and copper oxide. Generally, the control factors of the synthetic experiments included the different pH values, reaction temperature or to calcined temperature of copper salt products, to prepare the different crystalline grain shape and particle size the copper hydroxide and the copper oxide powder; then the experiment is simulation waste acid solution under various kinds the proportion of Cu2+and Cl-, then add the 5N NaOH solution and fixed pH value. Find out preparation to copper hydroxide optimum operate condition. Showed that when the molar ration Cu(II)：Cl(I) =1：5, used small amount of NaOH solution , and products not sticky, cause the reaction to be complete.
The part of copper oxide divides into the calcined and hydrothermal decomposition, by analyse under various kinds of instruments, can finding that in 350℃and 5 hours later, can obtained the pure copper oxide. The hydrothermal decomposition used the 56mL 5N NaOH solution add to the molar ration Cu(II)：Cl(I) =1：5. Using different reaction temperature and reaction time, to observe products structures, shapes, components by analyse under various kinds of instruments. Finding that products reaction complete showed to 160℃ and 1 hours stirring.
The part of five pieces of water of crystallization of copper sulfate use equivalent Cu(OH)2 and CuO, add 5N H2SO4 solution. when mixing time exceed 1.5 hours, there will be emerge of tiny particles; crystal to follow precipitate for a long time, then crystal size gradually increase. But to not having relative influence with the result of content of copper that is filtered out, there is certain influence to the yield. To compare air-dry with dry by heat then absorbent water, we can find the dry by heat then absorbent water theory value to approach.
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