WO2021037032A1 - 一种从废线路板金属富集体粉末中回收铜的方法 - Google Patents

一种从废线路板金属富集体粉末中回收铜的方法 Download PDF

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WO2021037032A1
WO2021037032A1 PCT/CN2020/111164 CN2020111164W WO2021037032A1 WO 2021037032 A1 WO2021037032 A1 WO 2021037032A1 CN 2020111164 W CN2020111164 W CN 2020111164W WO 2021037032 A1 WO2021037032 A1 WO 2021037032A1
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circuit board
waste circuit
leaching
enriched
powder
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PCT/CN2020/111164
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French (fr)
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陈维平
刘方方
王发展
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华南理工大学
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B13/00—Obtaining lead
    • C22B13/04—Obtaining lead by wet processes
    • C22B13/045—Recovery from waste materials
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B15/00—Obtaining copper
    • C22B15/0063—Hydrometallurgy
    • C22B15/0065—Leaching or slurrying
    • C22B15/0067—Leaching or slurrying with acids or salts thereof
    • C22B15/0069—Leaching or slurrying with acids or salts thereof containing halogen
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • C22B7/006—Wet processes
    • C22B7/007—Wet processes by acid leaching
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • the invention relates to the field of separation, purification and recovery of valuable resources in waste circuit boards, in particular to a method for recovering copper from waste circuit board metal-rich collective powder.
  • waste circuit boards contain a large amount of recyclable valuable metal resources and have high recycling value. How to efficiently recycle the metal resources of waste circuit boards has attracted widespread attention from domestic and foreign researchers.
  • my country's circuit board recycling methods mainly include mechanical physical method, hydrometallurgy and pyrometallurgy, etc.
  • mechanical physical treatment methods are often widely used in the pretreatment of waste circuit boards because of their large processing capacity and low cost. the way.
  • the metal-rich group powder and the non-metal-rich group powder are obtained by disassembling, crushing, and sorting the circuit board.
  • Cu is the non-ferrous metal with the highest content in waste circuit boards.
  • the most widely used method currently is to dissolve the copper, convert it into an ionic form and enter the solution, and then deposit the elemental copper by electrolysis to achieve recovery.
  • Patent application [201510903663.9] pulverize waste circuit boards, and then use copper chloride etching waste to stir for 20-60 minutes to achieve copper extraction;
  • patent application [201710824544.3] uses CuSO4•5H2O/NaCl/H2SO4 as the electrolysis system to achieve Separate metal and non-metal from waste circuit boards.
  • the purpose of the present invention is to provide a method for recovering copper from waste circuit board metal-enriched powder.
  • This method takes waste circuit board metal-enriched powder as the object, and leaches the Sn, Pb, and Fe in the enriched particles through one-step acid leaching treatment to obtain high-purity Cu powder, and realizes that Cu and other metals mainly include Sn, Pb,
  • the high-efficiency separation of Fe, etc. avoids the process of leaching and re-electrolytic deposition, and establishes a new method for recycling waste circuit board resources with simple operation, high efficiency, energy saving and environmental protection.
  • a method for recovering copper from waste circuit board metal-rich collective powder including the following steps:
  • hydrochloric acid as the leaching agent, dissolve the metals other than Cu in the waste circuit board metal-enriched material through chemical leaching, and then filter and separate it. Pure Cu powder; the concentration of the hydrochloric acid is 2 ⁇ 11 mol/L; The leaching temperature is 35 ⁇ 110°C;
  • step (3) Cooling, standing, filtering and drying the filtrate obtained in step (1) to obtain PbCl2 crystals.
  • the metal-rich waste circuit board raw materials mainly contain Cu, Sn, Pb, and Fe metal components.
  • the pretreatment is to crush, pulverize, and physically separate the waste circuit boards to remove non-metals to obtain metal-rich aggregate powder.
  • step (1) the chemical leaching process is carried out in a constant temperature water bath, and stirring is carried out by means of magnetic stirring.
  • step (1) part of the hydrochloric acid will volatilize during the chemical leaching process, and will reflux into the leaching solution after condensation. A small amount of residual HCl gas is introduced into the alkaline solution for absorption and neutralization.
  • the filtration is preferably vacuum filtration.
  • the concentration of the hydrochloric acid is 6-8 mol/L.
  • the liquid-to-solid ratio during the leaching process is 0.5-5 ml/g.
  • the temperature of the leaching is 70-90°C.
  • the leaching time is 20 to 120 min.
  • step (2) a reducing gas is used to reduce the copper oxide.
  • step (2) the reduction adopts pure hydrogen or decomposed ammonia reduction.
  • step (3) PbCl2 will precipitate after the filtrate is cooled and left standing, and PbCl2 can be obtained after filtering, washing and drying.
  • step (3) the valuable metals in the obtained filtrate are further subjected to wet extraction.
  • the invention adopts an acid leaching method to remove Sn, Pb, Fe impurity metals in the metal for the waste circuit board metal-rich powder obtained after physical and mechanical pretreatment, thereby directly recovering high-grade pure Cu powder.
  • the method can be used to obtain high-purity copper powder that can be directly used for materialization, and the leaching solution can be processed to obtain relatively pure PbCl2 crystals, which can be used as analytical reagents, solders or preparation of lead yellow dyes.
  • the present invention has the following advantages:
  • the traditional wet process will dissolve all metal elements including Cu, and then obtain Cu and other metal elements through electrolytic purification. This process does not need to dissolve the high-content Cu element in the metal-rich group, but only needs to dissolve the low-content Sn, Pb, Fe and other impurity metals to directly obtain pure Cu powder, with short flow and low consumption.
  • the purity of the recovered copper reaches 99.4%, and the recovery rate of copper reaches 99.3%.
  • the leaching rate of iron reaches more than 99%, the leaching rate of tin reaches 97.50%, and the leaching rate of lead reaches 98.5%.
  • Figure 1 is a photograph of the product recovered in Example 1-high-purity Cu powder.
  • Figure 2 is a photograph of the product recovered in Example 1-PbCl 2 crystals.
  • a method for recovering copper from waste circuit board metal-enriched powder uses waste circuit board metal-enriched powder pretreated by crushing, re-selection and physical impurity removal as raw materials. Take 50g of the material and put it into a three-necked flask. 50 ml of hydrochloric acid with a concentration of 10 mol/L, the entire leaching process is carried out in a constant temperature magnetic stirring water bath, the temperature in the water bath is 50 °C, and the leaching rate is 60 min under magnetic stirring. At this time, the leaching rate of Sn is 97.5%, the leaching rate of Pb is 98.4%, and the leaching rate of Fe reaches more than 99%.
  • a method for recovering copper from waste circuit board metal-enriched powder uses waste circuit board metal-enriched powder pretreated by crushing, re-selection and physical impurity removal as raw materials. Take 50g of the material and put it into a three-necked flask. 100 ml of hydrochloric acid with a concentration of 8 mol/L, the entire leaching process is carried out in a constant temperature magnetic stirring water bath, the temperature in the water bath is 70 °C, leaching under magnetic stirring conditions for 60 minutes, at this time, the leaching rate of Sn 96.9%, the leaching rate of Pb is 97.1%, and the leaching rate of Fe reaches more than 99%.
  • a method for recovering copper from waste circuit board metal-enriched powder uses waste circuit board metal-enriched powder pretreated by crushing, re-selection and physical impurity removal as raw materials. Take 50g of the material and put it into a three-necked flask. 150 ml of hydrochloric acid with a concentration of 6 mol/L, the entire leaching process is carried out in a constant temperature magnetic stirring water bath, the temperature in the water bath is 75 °C, and the leaching rate is 90 min under the condition of magnetic stirring. At this time, the leaching rate of Sn is 97.1%, the leaching rate of Pb is 97.6%, and the leaching rate of Fe reaches more than 99%.
  • a method for recovering copper from waste circuit board metal-enriched powder uses waste circuit board metal-enriched powder pretreated by crushing, reselection and physical impurity removal as raw materials, taking 50g of the material into a three-necked flask, and adding 200 ml of hydrochloric acid with a concentration of 4 mol/L, the whole leaching process is carried out in a constant temperature magnetic stirring water bath, the temperature in the water bath is 90 °C, leaching under magnetic stirring conditions for 120 min, at this time, the leaching rate of Sn 96.5%, the leaching rate of Pb is 96.3%, and the leaching rate of Fe reaches more than 99%.
  • a method for recovering copper from waste circuit board metal-enriched powder uses waste circuit board metal-enriched powder pretreated by crushing, re-selection and physical impurity removal as raw materials. Take 50g of the material and put it into a three-necked flask. 200 ml of hydrochloric acid with a concentration of 4 mol/L, the entire leaching process is carried out in a constant temperature magnetic stirring water bath, the temperature in the water bath is 110 °C, and the leaching is 120 min under the condition of magnetic stirring. At this time, the leaching rate of Sn is 95.3%, the leaching rate of Pb is 95.3%, and the leaching rate of Fe reaches more than 99%.
  • a method for recovering copper from waste circuit board metal-enriched powder uses waste circuit board metal-enriched powder pretreated by crushing, re-selection and physical impurity removal as raw materials. Take 50g of the material and put it into a three-necked flask. 50 ml of hydrochloric acid with a concentration of 11 mol/L, the whole leaching process is carried out in a constant temperature magnetic stirring water bath, the temperature in the water bath is 35 °C, and the leaching is 60 min under the condition of magnetic stirring. At this time, the leaching rate of Sn is 96.5%, the leaching rate of Pb is 98.5%, and the leaching rate of Fe reaches more than 99%.
  • the waste circuit board raw materials are collected from waste electronic and electrical product dismantling enterprises, and after further crushing, reselection and physical removal of impurities, the metal-rich collective composition obtained is: Cu (80 ⁇ 90 wt.% ), Sn (3 ⁇ 8 wt.%), Pb (2 ⁇ 5 wt.%), Fe (0.5 ⁇ 1.0 wt.%) non-metallic (0.5 ⁇ 1.5 wt.%).

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Abstract

一种从废线路板金属富集体粉末中回收铜的方法，涉及废旧线路板中有价资源的分离提纯回收方法，属于环境保护与资源综合利用领域的固体废弃物处理领域。该方法利用浓盐酸对废线路板经过预处理得到的金属富集体粉末进行浸取，通过合理控制浸取液浓度及浸取温度，最终将Sn、Pb、Fe杂质金属全部浸出，并得到了两种能直接应用的回收产物：(1)高纯度的Cu粉；(2)高纯度PbCl 2。回收过程工艺流程短、节能、环保，符合循环经济的社会发展需求。

Description

一种从废线路板金属富集体粉末中回收铜的方法 技术领域
本发明涉及废旧线路板中有价资源的分离提纯回收领域，具体涉及一种从废线路板金属富集体粉末中回收铜的方法。
 背景技术
废旧线路板作为典型的电子废弃物的重要组成部分，含有大量的可回收有价金属资源，具有较高的回收价值。如何高效地回收废线路板的金属资源引起了国内外科研人员的广泛关注。目前，我国线路板资源化回收方法中主要有机械物理法、湿法冶金和火法冶金等，其中机械物理处理方式，因为处理量大，成本低，往往被广泛应用于废旧线路板的预处理方式。利用废线路板的各组分物理特性的不同，通过将线路板进行拆解、破碎、分选等过程得到金属富集体粉末和非金属富集体粉末。但是由于受到分选粒径的限制，往往难以彻底分离各组分，还需要进一步的分离和提纯。常见的后续处理方法有：湿法冶金提纯技术和火法冶金技术。其中火法冶金是利用冶金炉高温加热处理，非金属物质在高温下被剥离、焚烧，金属组分通过熔炼加以分离；湿法冶金技术是将破碎后的废弃物颗粒浸入酸、碱等溶液介质中，通过化学作用对原料中金属或化合物进行提取和分离，从而提取目标金属的化学冶金过程。湿法处理过程通常包括浸出、沉淀、结晶、过滤、萃取、离子交换、电解等过程。主要用于回收金属组分，回收率较高。
Cu是废旧线路板中含量最高的有色金属。在对金属铜的湿法提纯当中，当前应用最为广泛的方法是通过将铜溶解，转化成离子形态进入到溶液，再利用电解方法将单质铜沉积出来，实现回收。
专利申请[201510903663.9]将废电路板粉碎，然后使用氯化铜蚀刻废液进行搅拌20~60分钟，从而实现浸提铜；专利申请[201710824544.3]以CuSO4•5H2O/NaCl/ H2SO4作为电解体系，实现从废旧线路板中分离金属与非金属。
 技术解决方案
为了克服现有技术的不足，本发明的目的在于提供一种从废线路板金属富集体粉末中回收铜的方法。该方法以废线路板金属富集体粉末为对象，通过一步酸浸处理对富集体颗粒中的Sn、Pb、Fe进行浸出，得到高纯度的Cu粉，实现Cu与其他金属主要包括Sn、Pb、Fe等的高效分离，避免了浸出再电解沉积的过程，确立了一种操作简单、效率高、节能环保的废弃线路板资源回收利用新方法。
本发明的目的通过以下技术方案实现。
一种从废线路板金属富集体粉末中回收铜的方法，包括以下步骤：
    （1）以经过预处理得到的废线路板金属富集体粉末为原料，以盐酸作为浸出剂，通过化学浸出的方式将废线路板金属富集体中除Cu外的金属溶解，再经过滤分离得到纯Cu粉；所述盐酸的浓度为2~11 mol/L；所述浸出的温度为35~110℃；
（2）对步骤（1）得到的Cu粉进行清洗、干燥过程中表面会产生氧化铜，再对氧化铜进行还原；
（3）对步骤（1）得到的滤液进行冷却、静置、过滤和干燥，得到PbCl2结晶。
作为本发明的进一步优选，步骤（1）中，所述废线路板金属富集体原料主要含Cu、Sn、Pb、Fe金属成分。
作为本发明的进一步优选，步骤（1）中，所述预处理是将废线路板进行破碎、粉碎、物理分选去除非金属，得到金属富集体粉末。
作为本发明的进一步优选，步骤（1）中，化学浸出过程在恒温水浴锅进行，采用磁力搅拌的方式进行搅拌。
作为本发明的进一步优选，步骤（1）中，化学浸出过程中会有部分盐酸挥发，经过冷凝回流到浸出液中。残余少量的HCl气体导入到碱溶液中吸收中和。
作为本发明的进一步优选，步骤（1）中，所述过滤优选为真空抽滤。
作为本发明的进一步优选，步骤（1）中，所述盐酸浓度为6~8 mol/L。
作为本发明的进一步优选，步骤（1）中，浸出过程中的液固比为0.5~5 ml/g。
作为本发明的进一步优选，步骤（1）中，所述浸出的温度为70~90℃。
作为本发明的进一步优选，步骤（1）中，所述浸出的时间为20~120 min。
作为本发明的进一步优选，步骤（2）中，采用还原性气体对氧化铜进行还原。
作为本发明的进一步优选，步骤（2）中，所述还原采用纯氢气或分解氨还原。
作为本发明的进一步优选，步骤（3）中，所得滤液冷却静置后会有PbCl2析出，经过滤、清洗、干燥可得到PbCl2。
作为本发明的进一步优选，步骤（3）中，对所得滤液中有价金属进一步进行湿法提取。
本发明中浸出过程中发生的化学反应： 
2HCl + Sn → SnCl 2 + H 2↑              (1)
4HCl + Pb → H 2PbCl 4 + H 2↑           (2)
2HCl + Fe →FeCl 2 + H 2↑                 (3)
本发明针对经过物理机械预处理后得到的废线路板金属富集体粉末，采用酸浸方法去除金属中的Sn、Pb、Fe杂质金属，从而直接回收得到高品位的纯Cu粉末。利用该方法可以得到能够直接材料化应用的高纯度的铜粉末，以及浸出液经过后续处理得到比较纯的PbCl2晶体，可以用作分析试剂、焊料或制备铅黄染料等用途。
 有益效果
与现有技术相比，本发明具有以下优点：
1、传统湿法工艺将包括Cu在内的所有金属元素溶解，再经电解提纯得到Cu和其它金属元素。本工艺不需要溶解金属富集体中含量高的Cu元素，只需将含量少的Sn、Pb、Fe等杂质金属溶解，直接获得纯Cu粉末，流程短、消耗低。
2、本工艺经过酸浸工序处理即可得到纯Cu粉末（纯度99.4%）和较纯的PbCl2化工产品。
3、经本发明技术处理，回收的铜纯度达到99.4%, 铜的回收率达到99.3%, 铁浸出率达到99%以上，锡的浸出率达到97.50%，铅的浸出率达到98. 5%。
 附图说明
图1为实施例1回收的产物-高纯度Cu粉末的照片。
图2为实施例1回收的产物- PbCl 2晶体的照片。
本发明的实施方式
以下结合实例与附图对本发明的具体实施作进一步的说明，但本发明的实施方式不限于此。
实施例 1
一种从废线路板金属富集体粉末中回收铜的方法，该方法以经过破碎、重选及物理除杂预处理的废线路板金属富集体为原材料，取50g物料放入三口烧瓶中，加入50 ml浓度为10 mol/L的盐酸，整个浸出过程在恒温磁力搅拌水浴锅中进行，水浴锅中的温度为50 ℃，在磁力搅拌的条件下浸出60 min，此时，Sn的浸出率为97.5%，Pb的浸出率为98.4%，Fe的浸出率达到99%以上。经过过滤、清洗、干燥、还原（氢气、温度400℃、1h）得到纯Cu粉（如图1 所示）。再对滤液进行冷却、静置、过滤和干燥，得到PbCl 2结晶（如图2所示）。铜回收率为98.8%、纯度为99.4%。
实施例 2
一种从废线路板金属富集体粉末中回收铜的方法，该方法以经过破碎、重选及物理除杂预处理的废线路板金属富集体为原材料，取50g物料放入三口烧瓶中，加入100 ml浓度为8 mol/L的盐酸，整个浸出过程在恒温磁力搅拌水浴锅中进行，水浴锅中的温度为70 ℃，在磁力搅拌的条件下浸出60 min，此时，Sn的浸出率为96. 9%，Pb的浸出率为97.1%，Fe的浸出率达到99%以上。经过过滤、清洗、干燥、还原（氢气、温度400℃、1h）得到纯Cu粉。再对滤液进行冷却、静置、过滤和干燥，得到PbCl 2结晶。铜回收率为99.3%、纯度为99.4%。
实施例 3
一种从废线路板金属富集体粉末中回收铜的方法，该方法以经过破碎、重选及物理除杂预处理的废线路板金属富集体为原材料，取50g物料放入三口烧瓶中，加入150 ml浓度为6 mol/L的盐酸，整个浸出过程在恒温磁力搅拌水浴锅中进行，水浴锅中的温度为75 ℃，在磁力搅拌的条件下浸出90 min，此时，Sn的浸出率为97.1%，Pb的浸出率为97.6%，Fe的浸出率达到99%以上。经过过滤、清洗、干燥、还原（氢气、温度400℃、1h）得到纯Cu粉。再对滤液进行冷却、静置、过滤和干燥，得到PbCl 2结晶。铜回收率为99.2%、纯度为99.4%。
实施例 4
一种从废线路板金属富集体粉末中回收铜的方法，该方法以经过破碎、重选及物理除杂预处理的废线路板金属富集体为原材料，取50g物料放入三口烧瓶中，加入200 ml浓度为4 mol/L的盐酸，整个浸出过程在恒温磁力搅拌水浴锅中进行，水浴锅中的温度为90 ℃，在磁力搅拌的条件下浸出120 min，此时，Sn的浸出率为96. 5%，Pb的浸出率为96. 3%，Fe的浸出率达到99%以上。经过过滤、清洗、干燥、还原（氢气、温度400℃、1h）得到纯Cu粉。再对滤液进行冷却、静置、过滤和干燥，得到PbCl 2结晶。铜回收率为99.1%、纯度为99.4%。
实施例 5
一种从废线路板金属富集体粉末中回收铜的方法，该方法以经过破碎、重选及物理除杂预处理的废线路板金属富集体为原材料，取50g物料放入三口烧瓶中，加入200 ml浓度为4 mol/L的盐酸，整个浸出过程在恒温磁力搅拌水浴锅中进行，水浴锅中的温度为110 ℃，在磁力搅拌的条件下浸出120 min，此时，Sn的浸出率为95. 3%，Pb的浸出率为95.3%，Fe的浸出率达到99%以上。经过过滤、清洗、干燥、还原（氢气、温度400℃、1h）得到纯Cu粉。再对滤液进行冷却、静置、过滤和干燥，得到PbCl 2结晶。铜回收率为98.9%、纯度为99.4%。
实施例 6
一种从废线路板金属富集体粉末中回收铜的方法，该方法以经过破碎、重选及物理除杂预处理的废线路板金属富集体为原材料，取50g物料放入三口烧瓶中，加入50 ml浓度为11 mol/L的盐酸，整个浸出过程在恒温磁力搅拌水浴锅中进行，水浴锅中的温度为35 ℃，在磁力搅拌的条件下浸出60 min，此时，Sn的浸出率为96.5%，Pb的浸出率为98.5%，Fe的浸出率达到99%以上。经过过滤、清洗、干燥、还原（氢气、温度400℃、1h）得到纯Cu粉。再对滤液进行冷却、静置、过滤和干燥，得到PbCl 2结晶。铜回收率为98.7%、纯度为99.4%。
上述实施例中，所述的废弃线路板原料采集自废旧电子电器产品拆解企业，经过自行进一步破碎、重选及物理除杂，得到的金属富集体成分是：Cu（80~90 wt.%）、Sn（3~8 wt.%）、Pb（2~5 wt.%）、Fe（0.5~1.0 wt.%）非金属（0.5~1.5 wt.%）。
以上给出的实施例，拟对本发明作进一步的说明，但不能理解为是对本发明保护范围的限制，该领域的技术人员根据上述本发明的内容对本发明做出的一些非本质的改进和调整，仍然属于本发明的保护范围。

Claims (10)

  1. 一种从废线路板金属富集体粉末中回收铜的方法，其特征在于，包括以下步骤：
        （1）以经过预处理得到的废线路板金属富集体粉末为原料，以盐酸作为浸出剂，通过化学浸出的方式将废线路板金属富集体中除Cu外的金属溶解，再经过滤分离得到纯Cu粉；所述盐酸的浓度为4~11 mol/L；所述浸出的温度为35~110℃；
    对步骤（1）得到的Cu粉进行清洗、干燥过程中表面会产生氧化铜，再对氧化铜进行还原；
    对步骤（1）得到的滤液进行冷却、静置、过滤和干燥，得到PbCl 2结晶。
  2. 如权利要求1所述的一种从废线路板金属富集体粉末中回收铜的方法，其特征在于，步骤（1）中，所述废线路板金属富集体原料主要含Cu、Sn、Pb、Fe金属成分。
  3. 如权利要求1所述的一种从废线路板金属富集体粉末中回收铜的方法，其特征在于，步骤（1）中，所述预处理是将废线路板进行破碎、粉碎、物理分选去除非金属，得到金属富集体粉末。
  4. 如权利要求1所述的一种从废线路板金属富集体粉末中回收铜的方法，其特征在于，步骤（1）中，所述盐酸浓度为6~8 mol/L。
  5. 如权利要求1所述的一种从废线路板金属富集体粉末中回收铜的方法，其特征在于，步骤（1）中，浸出过程中的液固比为0.5~5 ml/g。
  6. 如权利要求1所述的一种从废线路板金属富集体粉末中回收铜的方法，其特征在于，步骤（1）中，所述浸出的温度为70~90℃。
  7. 如权利要求1所述的一种从废线路板金属富集体粉末中回收铜的方法，其特征在于，步骤（1）中，所述浸出的时间为20~120 min。
  8. 如权利要求1所述的一种从废线路板金属富集体粉末中回收铜的方法，其特征在于，步骤（2）中，采用还原性气体对氧化铜进行还原。
  9. 如权利要求1所述的一种从废线路板金属富集体粉末中回收铜的方法，其特征在于，所述还原性气体为纯氢气或分解氨。
  10. 如权利要求1所述的一种从废线路板金属富集体粉末中回收铜的方法，其特征在于，步骤（3）中，所得滤液冷却静置后会有PbCl 2析出，经过滤、清洗、干燥可得到PbCl 2。
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