WO2012031379A1 - 低温焙烧提金工艺 - Google Patents

低温焙烧提金工艺 Download PDF

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Publication number
WO2012031379A1
WO2012031379A1 PCT/CN2010/001726 CN2010001726W WO2012031379A1 WO 2012031379 A1 WO2012031379 A1 WO 2012031379A1 CN 2010001726 W CN2010001726 W CN 2010001726W WO 2012031379 A1 WO2012031379 A1 WO 2012031379A1
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WO
WIPO (PCT)
Prior art keywords
gold
roasting
low
temperature
temperature roasting
Prior art date
Application number
PCT/CN2010/001726
Other languages
English (en)
French (fr)
Original Assignee
长春黄金研究院
中国黄金集团公司技术中心
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 长春黄金研究院, 中国黄金集团公司技术中心 filed Critical 长春黄金研究院
Publication of WO2012031379A1 publication Critical patent/WO2012031379A1/zh

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Classifications

    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22BPRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00Preliminary treatment of ores or scrap
    • C22B1/02Roasting processes
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22BPRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B11/00Obtaining noble metals
    • C22B11/08Obtaining noble metals by cyaniding

Definitions

  • the invention relates to a roasting process for refractory gold ore, in particular to a low temperature roasting and gold stripping process.
  • the roasting process which has been widely used in recent years is mainly a conventional boiling roasting process, which has unparalleled advantages in many other processes, such as high roasting strength, low slag residual sulfur, uniform furnace temperature, simple furnace structure, and no rotation. Parts, etc., but there are limitations in actual production.
  • Conventional boiling roasting process is to achieve and maintain a certain calcination temperature by roasting the concentrate by the sulfur oxidation reaction of the concentrate itself. When roasting the ore and some concentrates with low sulfur content, it is necessary to add coal and other fuels. Maintaining the calcination temperature, the calcination temperature is high due to the high ignition point of sulfur and coal, so the method is only suitable for those materials suitable for high temperature roasting.
  • the calcination temperature is too high, although some harmful minerals can be oxidized and removed, but at the same time, many metal oxides which are not favorable for gold leaching are formed, which reduces the recovery rate of gold.
  • the low-temperature roasting gold extraction process can effectively avoid excessive metal oxides during the roasting process and improve the recovery rate of gold.
  • An object of the present invention is to provide a low-temperature calcination gold extraction process which solves the problem that the conventional boiling roasting gold extraction process is not easy to be low-temperature roasting.
  • the technical proposal of the invention is: feeding the prepared material to be calcined into the roaster through a feeder, The gas supplied from the air supply port is evenly fed into the material layer; the roasting temperature of the roasting furnace is controlled to be 350 ° C to 550 ° C according to the nature of the material, and the roasting time is 30 minutes to 180 minutes, and the calcined material is discharged from the discharge port.
  • the blast is discharged into a calcine, and the obtained calcine is extracted by a conventional cyanation process and a smelting process.
  • the prepared material is fed into the roaster through the feeder, and the gas supplied from the air supply port is evenly fed into the material layer, and the material feeding speed, the roasting temperature, the oxygen supply amount and the like are strictly controlled according to the ore property requirements. After maintaining a certain temperature and time, it is discharged from the discharge port, and the flue gas generated by the roasting is discharged by the flue ⁇ ;
  • the invention has the beneficial effects of solving the problem that the conventional boiling roasting process is not easy to be calcined at a low temperature, satisfies different requirements of the roasting conditions of the materials during the roasting process, and improves the leaching rate of gold.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Manufacturing & Machinery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Description

低温焙烧提金工艺
技术领域
本发明涉及一种难处理金矿石的焙烧工艺, 特别涉及一种低温焙烧提金工 艺。
背景技术
随着我国黄金工业的快速发展, 易于直接氰化提取的金矿资源日渐枯竭, 难处理金矿资源己成为今后黄金工业的主要原料。 因此, 焙烧工艺在黄金生产 中迅速得到应用与发展。
近年来得到较多应用的焙烧工艺主要为常规沸腾焙烧工艺, 该工艺有着许 多其它工艺无可比拟的优点, 如焙烧强度高、 矿渣残硫低、 炉床温度均匀、 炉 体结构简单、 无转动部件等, 但在实际生产中也存在着局限性。 常规沸腾焙烧 工艺在焙烧精矿时, 是靠精矿自身的硫氧化反应放热来达到和维持一定的焙烧 温度, 在焙烧原矿和一些含硫较低的精矿时, 需要添加煤等燃料来维持焙烧温 度, 由于硫和煤燃点高, 因此焙烧温度偏高, 所以该方法只适用于那些适宜高 温焙烧的物料。 对于一些需要低温焙烧的物料来说, 焙烧温度过高, 虽然可以 使一些有害矿物氧化去除, 但同时也生成了许多不利于金浸出的金属氧化物, 降低了金的回收率。 低温焙烧提金工艺可有效避免焙烧过程中生成过多的金属 氧化物, 提高了金的回收率。
技术方案
本发明的目的在于提供一种低温焙烧提金工艺, 该焙烧工艺解决了常规沸 腾焙烧提金工艺不易低温焙烧的问题。
本发明的技术方案是: 将准备好的欲焙烧的物料通过给料器给入焙烧炉, 由供风口供入的气体均匀地给入物料层; 根据物料的性质控制焙烧炉的焙烧温 度为 350°C〜550°C, 焙烧时间为 30分钟〜 180分钟, 焙烧后的物料从排料口排 出成为焙砂, 得到的焙砂通过常规氰化工艺和冶炼工艺提取金。 通过低温焙烧, 含金物料中一些有害矿物被氧化去除, 金暴露解离, 同时可避免生成过多的金 属氧化物, 获得满意的焙烧效果, 提高了金的回收率。
本发明的具体步骤是-
( 1 ) 焙烧物料准备
控制矿石的磨矿粒度在 P60%= 0.015mm〜 P95%= 0.043mm之间;
(2 ) 焙烧作业
将准备好的物料通过给料器给入焙烧炉, 由供风口供入的气体均匀地给入 物料层, 根据矿石性质要求, 严格控制物料给料速度、 焙烧温度、 供氧量等条 件, 物料保持了一定的温度和时间后, 从排料口排出, 焙烧产生的烟气由烟道 ί 排出;
( 3 λ金的提取
焙砂通过常规氰化工艺和冶炼工艺提取金。
本发明的有益效果是: 解决了常规沸腾焙烧工艺不易低温焙烧的问题, 满 足了焙烧过程中物料对焙烧条件的不同要求, 提高了金的浸出率。
具体实施方式
实施例 1:
( 1 )、 西南某金矿中等硫化物碳质微粒浸染型难处理金矿石, 控制磨矿细 度为 -0.074mm, 含量以重量百分比计为 82%;
(2)、 空气经热风炉预热后, 通入沸腾焙烧炉, 控制焙烧温度为 450°C , 焙 烧时间为 60分钟, 焙砂硫氧化率为 82.78%, 有机碳脱除率为 88.83%;
(3 )、 焙砂经常规氰化工艺, 金浸出率由 1.90%提高至 81.06%。
实施例 2:
( 1 )、 东北某金矿浮选金精矿, 细度为 -0.074mm, 含量以重量百分比计为
85%;
(2)、 向利用硅碳棒加热的焙烧炉中通入空气, 控制焙烧温度为 500°C, 焙 烧时间为 90分钟, 焙砂硫氧化率为 96.76%;
(3 )、 焙砂经常规氰化工艺, 金浸出率由 65.54%提高至 91.11%。
实施例 3 :
( 1 )、 西南某金矿贫硫化物碳质微细粒浸染型难处理含金矿石, 控制磨矿 细度为 -0.074mm, 含量以重量百分比计为 80%;
(2)、向微波焙烧炉中通入空气,通过微波辐射矿石控制焙烧温度为 500°C, 焙烧时间为 45分钟, 硫氧化率为 95.10%, 有机碳脱除率为 84.91%;
( 3 )、 焙砂经常规氰化工艺, 金浸出率由 4.83%提高到 81.12%。

Claims

1、 一种低温焙烧提金工艺, 该工艺是将准备好的欲焙烧的物料通过给料器 给入焙烧炉, 由供风口供入的气体均匀地给入物料层; 根据物料的性质控制焙 烧炉的焙烧温度为 350°C〜550°C, 焙烧时间为 30分钟〜 180分钟, 焙烧后的物 料从排料口排出成为焙砂, 得到的焙砂通过常规氰化工艺和冶炼工艺提取金。
PCT/CN2010/001726 2010-09-09 2010-10-29 低温焙烧提金工艺 WO2012031379A1 (zh)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102766761A (zh) * 2012-08-20 2012-11-07 长沙矿冶研究院有限责任公司 从含钒粘土矿中提取五氧化二钒的方法

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102560084A (zh) * 2012-01-14 2012-07-11 长春黄金设计院 一种含后燃烧技术的脱砷工艺方法
CN105219950A (zh) * 2014-06-17 2016-01-06 武汉理工大学 一种硫酸渣提金焙烧预处理方法
CN107034353A (zh) * 2017-04-27 2017-08-11 中南大学 一种低温焙烧酸浸解离金的方法
CN107199116B (zh) * 2017-06-09 2023-01-20 烟台市金奥环保科技有限公司 一种含碳金精矿两段焙烧渣选碳方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0622467A1 (de) * 1993-04-30 1994-11-02 Metallgesellschaft Ag Verfahren zum Rösten von refraktären Golderzen
CN1161379A (zh) * 1997-01-15 1997-10-08 核工业北京化工冶金研究院 从难浸矿石中提取金的方法
CN101285126A (zh) * 2008-06-05 2008-10-15 长春黄金研究院 低污染高回收率的难处理金精矿提金工艺

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0622467A1 (de) * 1993-04-30 1994-11-02 Metallgesellschaft Ag Verfahren zum Rösten von refraktären Golderzen
CN1161379A (zh) * 1997-01-15 1997-10-08 核工业北京化工冶金研究院 从难浸矿石中提取金的方法
CN101285126A (zh) * 2008-06-05 2008-10-15 长春黄金研究院 低污染高回收率的难处理金精矿提金工艺

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102766761A (zh) * 2012-08-20 2012-11-07 长沙矿冶研究院有限责任公司 从含钒粘土矿中提取五氧化二钒的方法
CN102766761B (zh) * 2012-08-20 2014-02-26 长沙矿冶研究院有限责任公司 从含钒粘土矿中提取五氧化二钒的方法

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