本文選題：粗硫酸銅 + 除雜　； 參考：《中南大學(xué)》2010年碩士論文

【摘要】： 銅粉是粉末冶金工業(yè)的基礎(chǔ)原材料之一,也是我國大量生產(chǎn)和消費(fèi)的有色金屬粉末,在現(xiàn)代工業(yè)生產(chǎn)中發(fā)揮著不可替代的作用。以硫酸銅為原料,采用不溶陽極電積的方法制備銅粉具有原料成本低、工藝流程短、產(chǎn)品應(yīng)用領(lǐng)域廣等優(yōu)點(diǎn)。但是在實(shí)際生產(chǎn)過程中,所采用的粗硫酸銅原料中As、Sb、Bi等雜質(zhì)直接造成電積銅粉中雜質(zhì)含量超標(biāo)；同時(shí),在不溶陽極電積過程中所使用的陽極為Pb-Ca-Sn合金陽極,陽極板性能的好壞,將直接影響銅粉中鉛的含量。 本論文采用氧化-中和-共沉淀法凈化粗硫酸銅溶液,研究了硫酸鐵與雙氧水加入量、終點(diǎn)pH值、氧化時(shí)間等對凈化效果的影響,確定了凈化除雜最佳工藝條件。研究表明：室溫下,控制mFe：mAs為13.5、V雙氧水：V溶液為1／600、終點(diǎn)pH為3.8、氧化時(shí)間為5 min時(shí),除雜效果最佳,原液中Fe脫除率為89.42%,As脫除率為98.03%,Sb脫除率為42.97%,Bi脫除率為35.36%,除雜后的電解液可以達(dá)到電積過程高品質(zhì)銅粉制備的要求。系統(tǒng)研究了電積過程銅電解液組成以及工藝條件對電流效率和產(chǎn)品性能的影響。研究結(jié)果表明：Cu2+濃度、硫酸濃度、電解液溫度的提高有利于降低槽電壓,Cu2+濃度、電解液溫度、刮粉周期的增加有利于提高電流效率,提高電流密度、高硫酸濃度、低Cu2+濃度有利于得到粒度小的銅粉；在最佳的工藝條件下,即Cu2+濃度15g/L,硫酸濃度140 g／L,電流密度為1800A/m2,溫度為35℃,刮粉周期為30 min,循環(huán)流量為14 L／h,極距為4.5 cm,得到的產(chǎn)品質(zhì)量達(dá)到了國家標(biāo)準(zhǔn)GB5246-2007的要求,粒度分布均勻且微觀形貌呈樹枝狀。 采用計(jì)時(shí)電位法(CP)、循環(huán)伏安(CV)、腐蝕速率、線性電位掃描(LSV)等電化學(xué)測試手段,研究了Pb-Ag-Ca, Pb-Sn-Ca, Pb-Sn-Sr, Pb-Sb合金陽極的陽極電位與耐腐蝕性能,優(yōu)選出Pb-Ag-Ca為最佳陽極,為不溶陽極電積銅粉的工業(yè)生產(chǎn)提供了依據(jù)。
[Abstract]:Copper powder is one of the basic raw materials of powder metallurgy industry . It is also a kind of non - replaceable metal powder in China ' s production and consumption . It has the advantages of low cost , short process flow and wide application field .
meanwhile , the anode used in the process of insoluble anode electrodeposition is the anode of the Pb - Ca - Sn alloy anode and the anode plate performance , and directly influences the content of lead in the copper powder .



The effects of iron sulfate and hydrogen peroxide addition , pH value of end point and oxidation time on the purification effect were studied . The results showed that the removal rate of Cu ~ ( 2 + ) , concentration of sulfuric acid , the temperature of electrolyte solution were 1 / 600 , the removal rate of Sb was 98.03 % , the removal rate of Sb was 98.03 % , the removal rate of Sb was 98.03 % , the removal rate of Sb was 98.03 % , the removal rate of Sb was 98.03 % , the removal rate of Sb was 98.03 % , the removal rate of Sb was 98.03 % , the removal rate of Sb was 98.03 % , the removal rate of Sb was 98.03 % , the removal rate of Sb was 98.03 % , the removal rate of Sb was 98.03 % , the removal rate of Sb was 98.03 % , the removal rate of Sb was 98.03 % , the removal rate of Sb was 98.03 % , the removal rate of Sb was 98.03 % , the removal rate of Sb was 8.03 % , the removal rate of the electrolyte was 98.03 % , the removal rate of Sb was 98.03 % , the removal rate of Sb was 8.03 % , the concentration of Cu ~ ( 2 + ) was increased , the concentration of sulfuric acid was increased , and the concentration of Cu ~ ( 2 + ) was favorable to get the copper powder with small particle size ;
Under the optimum conditions , the concentration of Cu2 + 15g / L , sulfuric acid concentration is 140 g / L , the current density is 1800 A / m2 , the temperature is 35 鈩，

本文編號：1849034