WO2019114198A1 - 一种氰化尾渣焙烧回收有价金属同步制备陶粒的方法 - Google Patents

一种氰化尾渣焙烧回收有价金属同步制备陶粒的方法 Download PDF

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WO2019114198A1
WO2019114198A1 PCT/CN2018/088702 CN2018088702W WO2019114198A1 WO 2019114198 A1 WO2019114198 A1 WO 2019114198A1 CN 2018088702 W CN2018088702 W CN 2018088702W WO 2019114198 A1 WO2019114198 A1 WO 2019114198A1
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ceramsite
calcining
calcination
calcined
roasting
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PCT/CN2018/088702
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English (en)
French (fr)
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吴玉锋
潘德安
孙旭东
左铁镛
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北京工业大学
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Priority to US16/485,121 priority Critical patent/US10626053B2/en
Publication of WO2019114198A1 publication Critical patent/WO2019114198A1/zh

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Definitions

  • the invention belongs to the technical field of comprehensive recycling of metallurgical waste residue, and particularly relates to a method for synchronously preparing ceramsite by calcination of cyanide tailings to recover valuable metals.
  • the cyanide gold extraction method is an economical and simple method for extracting gold from ore, concentrate or tailings, and has a series of advantages such as high recovery rate and strong adaptability to ore. Since its introduction at the end of the 19th century, this method has been widely used in world gold production and has become the main method for the selection and smelting of modern gold mines. At present, 90% of the world's gold mines use cyanidation to raise gold, and China's gold selection plant using cyanide gold extraction method has reached more than 80%. However, its shortcomings are also obvious, and the production process produces a large amount of cyanide tailings. Cyanide tailings were originally considered waste and the traditional treatment method was storage or landfill.
  • the re-recycling of tailings slag includes two aspects: first, recycling, extracting useful components from tailings, that is, re-election of tailings; second, utilizing, developing new products with tailings as basic raw materials.
  • most of the research on cyanide tailings has focused on how to further extract valuable elements such as Au, Ag, Fe, S in tailings more efficiently, and lack of relevant research on the disposal methods of residual residue after treatment.
  • the remaining waste residue is also a very important secondary mineral resource, and also contains a large number of available non-metallic mineral materials, mainly quartz, feldspar, pyroxene, garnet, amphibole, and aluminosilicates such as altered clay and mica.
  • Minerals and calcium and magnesium carbonate minerals such as calcite and dolomite can be widely
  • cyanide tailings As the main raw material will become an important development direction.
  • the non-metallic mineral components in the cyanide tailings are the same as those required for the ceramic raw materials.
  • the main raw material for the production of ceramsite the general preparation of ceramsite is carried out by high-temperature sintering. Considering the method of high-temperature sintering combined with the method of chlorination roasting, the heavy metal is volatilized in the form of chloride and the ceramsite is simultaneously fired. The entire process control is done in the same roasting equipment, reducing process steps and reducing energy consumption and pollution.
  • the method for synthesizing ceramsite by using cyanide tailings roasting and recovering valuable metals can not only solve the environmental problems caused by waste slag, but also realize the harmless value-added utilization of waste slag and create huge economic benefits. Therefore, the method for synthesizing ceramsite by calcination of cyanide tailings and recovery of valuable metals has very important significance and value.
  • the valuable metals in the cyanide tailings are recovered by roasting, and high-performance ceramsite is simultaneously prepared, thereby reducing environmental pollution, improving economic benefits, and achieving the effects of hazardous waste recycling and safe disposal.
  • Ball mill mixing The cyanide tailings, bentonite, calcium chloride, coal powder and albite are by weight ratio: 100: (5 ⁇ 10): (4 ⁇ 10): (1 ⁇ 7): ( 5 ⁇ 20) performing ball milling and mixing to obtain a mixture;
  • the baking material obtained in the step (3) is once calcined, the calcination temperature is 700-900 ° C, and the calcination time is 0.5-3 h, and the roasting material and the soot are obtained once;
  • the primary calcined material obtained in the step (4) is calcined at a high temperature, the calcination temperature is 1050 to 1200 ° C, and the calcination time is controlled to 0.5 to 3 h to obtain a secondary calcined material and soot;
  • Dust collection the dust obtained in steps (4) and (5) is subjected to dust collection treatment to obtain multi-metal soot for centralized treatment;
  • steps (4), (5) and (7) are carried out in the same roasting equipment.
  • the heavy metal content of the prepared ceramsite is much lower than the value specified in GB5085.3-2007, and the physical properties meet the standard of GB/T 14685-2011.
  • the invention combines the related technologies of chlorination volatilization and ceramsite preparation, can not only effectively improve the volatilization efficiency of heavy metals in cyanide tailings, but also can simultaneously fire ceramsite products, which reduces the Environmental pollution has also created economic value.
  • the invention can produce volatile ceramsite by volatilization and recovery of valuable metal in the process of roasting and sintering cyanide tailings by reasonable compounding, thereby achieving the effect of resource recovery and high value utilization of cyanide tailings, and can create good economic benefits. And environmental benefits, with significant energy saving and consumption reduction effects.
  • Figure 1 is a flow chart showing the process for preparing ceramsite by calcination of cyanide tailings to recover valuable metals.
  • the primary calcined material obtained in the step (4) is calcined at a high temperature, the calcination temperature is 1050 ° C, and the calcination time is controlled to 0.5 h to obtain a secondary calcined material and soot;
  • Dust collection the dust obtained in steps (4) and (5) is subjected to dust collection treatment to obtain multi-metal soot for centralized treatment;
  • the leaching content of several heavy metals in the finished ceramsite produced by using cyanide tailings is (mg/L): Ag: 0.0015, Cu: 0.043, Zn: 0.0013, As: 0.0014, Pb: 0.0015
  • the Hg content is lower than the detection limit of the instrument; the physical properties of the ceramsite are as follows: the water absorption rate is 13% in one hour, the bulk density is 1025 kg/m 3 , and the cylinder compressive strength is 11.5 MPa.
  • the primary calcined material obtained in the step (4) is calcined at a high temperature, the calcination temperature is 1200 ° C, and the calcination time is controlled to 3 h to obtain a secondary calcined material and soot;
  • Dust collection the dust obtained in steps (4) and (5) is subjected to dust collection treatment to obtain multi-metal soot for centralized treatment;
  • the leaching content of several heavy metals in the finished ceramsite produced by using cyanide tailings is (mg/L): Ag: 0.001, Cu: 0.041, Zn: 0.0011, As: 0.0012, Pb: 0.0013
  • the Hg content is lower than the detection limit of the instrument; the physical properties of the ceramsite are as follows: the water absorption rate is 15% in one hour, the bulk density is 1150 kg/m 3 , and the cylinder compressive strength is 12.5 MPa.
  • (1) ball-milling mixture cyanide tailings, bentonite, calcium chloride, coal powder and albite are ball-milled by weight ratio of 100:7:5:3:10 to obtain a mixture;
  • the primary calcined material obtained in the step (4) is calcined at a high temperature, the calcination temperature is 1100 ° C, and the calcination time is controlled to 1 h to obtain a secondary calcined material and soot;
  • Dust collection the dust obtained in steps (4) and (5) is subjected to dust collection treatment to obtain multi-metal soot for centralized treatment;
  • the leaching content of several heavy metals in the finished ceramsite produced by using cyanide tailings is (mg/L): Ag: 0.001, Cu: 0.047, Zn: 0.001, As: 0.0014, Pb: 0.0017
  • the Hg content is lower than the detection limit of the instrument; the physical properties of the ceramsite are as follows: the water absorption rate is 12.4% in one hour, the bulk density is 1035 kg/m 3 , and the cylinder compressive strength is 11.7 MPa.
  • the primary calcined material obtained in the step (4) is calcined at a high temperature, the calcination temperature is 1050 ° C, and the calcination time is controlled to 0.5 h to obtain a secondary calcined material and soot;
  • Dust collection the dust obtained in steps (4) and (5) is subjected to dust collection treatment to obtain multi-metal soot for centralized treatment;
  • the leaching content of several heavy metals in the finished ceramsite produced by using cyanide tailings is (mg/L): Ag: 0.0011, Cu: 0.041, Zn: 0.0016, As: 0.0013, Pb: 0.0016
  • the Hg content is lower than the detection limit of the instrument; the physical properties of the ceramsite are as follows: the water absorption rate is 13.4% in one hour, the bulk density is 1013 kg/m 3 , and the cylinder pressure strength is 11.3 MPa.
  • the primary calcined material obtained in the step (4) is calcined at a high temperature, the calcination temperature is 1200 ° C, and the calcination time is controlled to 3 h to obtain a secondary calcined material and soot;
  • Dust collection the dust obtained in steps (4) and (5) is subjected to dust collection treatment to obtain multi-metal soot for centralized treatment;
  • the leaching content of several heavy metals in the finished ceramsite produced by using cyanide tailings is (mg/L): Ag: 0.0014, Cu: 0.045, Zn: 0.0012, As: 0.0017, Pb: 0.0018
  • the Hg content is lower than the detection limit of the instrument; the physical properties of the ceramsite are as follows: the water absorption rate is 11.3% in one hour, the bulk density is 965 kg/m 3 , and the cylinder compressive strength is 10.8 MPa.
  • Dust collection the dust obtained in steps (4) and (5) is subjected to dust collection treatment to obtain multi-metal soot for centralized treatment;
  • the leaching content of several heavy metals in the finished ceramsite produced by using cyanide tailings is (mg/L): Ag: 0.001, Cu: 0.047, Zn: 0.001, As: 0.0014, Pb: 0.0017
  • the Hg content is lower than the detection limit of the instrument; the physical properties of the ceramsite are as follows: the water absorption rate is 11.4% in one hour, the bulk density is 985 kg/m 3 , and the cylinder compressive strength is 10.5 MPa.
  • a method for simultaneously preparing a ceramsite by calcining a cyanide tailings and recovering valuable metals by using the cyanidation tailings slag is provided, and the cyanidation tailings and the chlorinating agent and the like are rationally compounded and ball milled.
  • the raw material ball is prepared, and the heavy metal in the tailings is volatilized in the form of chloride by two calcination methods, and the volatile smoke is uniformly collected and concentrated, and the volatilized pellet is fired to meet the national standard. And finished ceramics with good performance.
  • the method not only can effectively remove various metals in the cyanide tailings, but also combines the new chlorination process, has the characteristics of high volatilization rate, energy saving, no pollution, wide adaptability, etc., and can eliminate environmental pollution. Moreover, the volatilized pellets can be simultaneously fired into ceramsite, and environmental benefits and economic benefits are obtained at the same time.

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Abstract

一种氰化尾渣焙烧回收有价金属同步制备陶粒的方法，将氰化尾渣、膨润土、氯化钙、煤粉和钠长石按一定重量比进行球磨混合，得到混合料；造粒，烘干后两次焙烧，将焙烧得到的烟尘进行收尘处理，得到多金属烟灰，进行集中处理；二次焙烧料进行冷却，得到陶粒。通过合理配料，在氰化尾渣焙烧和烧结过程中挥发回收有价金属并直接制备得到陶粒，达到氰化尾渣资源化回收和利用的效果。

Description

一种氰化尾渣焙烧回收有价金属同步制备陶粒的方法 技术领域
本发明属于冶金废渣综合回收技术领域，特别涉及一种氰化尾渣焙烧回收有价金属同步制备陶粒的方法。
背景技术
氰化提金法是从矿石、精矿或尾矿中提取金的经济而简易的方法，具有回收率高、对矿石适应性强等一系列优点。自十九世纪末被提出以后，此方法在世界黄金生产中得到了普遍应用，已成为现代黄金矿山选冶的主要方法。目前，世界上90％的金矿都采用氰化法提金，我国使用氰化提金法的选金厂达到了80％以上。但是其缺点也显而易见，生产过程产生了大量的氰化尾渣。氰化尾渣最初被视为废弃物，传统的处理方法就是堆存或者填埋。这样不仅会浪费大量的土地资源，而且氰化尾渣中的硫和重金属金、银、铜、铅、锌等以及浮选残留的氰化物等暴露在空气中，受阳光照射，雨水冲刷会产生有害气体、液体，渗透到地下会对水体以及土壤产生严重污染，此外经过多次工序的氰化尾渣颗粒细小，在干旱或大风天气下容易造成扬尘，影响空气质量，污染大气环境，对环境的危害极大。据测算，每年氰化渣废弃物造成污染的经济损失可达数亿元。由环保部联合国家发改委和公安部发布的新版《国家危险废物名录》自2016年8月1日起施行，其中将“采用氰化物进行黄金选矿过程中产生的氰化尾渣”定为危险废物，而根据《中华人民共和国环境保护税法》(将于2018年1月1日起执行)的相关规定，将对危险废物征收1000元/吨的环境保护税，如此，黄金行业将遭受毁灭性打击。所以对氰化尾矿渣的再资源化利用，不仅是资源合理开发和环境保护的需要，也是黄金产业提高经济效益和自身发展的需要，理所当然应引起重视。
尾矿渣的再资源化包含两方面的内容:一是回收，从尾渣中提取有用成分，即尾渣的再选；二是利用，以尾渣为基本原料开发新产品。目前，针对氰化尾渣大部分的研究都集中于如何更高效地进一步提取尾渣中Au、Ag、Fe、S 等有价元素，缺少对处理之后剩余废渣处置方法的相关研究。剩余的废渣也是非常重要的二次矿产资源，还含有大量可利用的非金属矿物材料，主要有石英、长石、辉石、石榴石、角闪石以及蚀变粘土、云母等铝硅酸盐矿物和方解石、白云石等钙镁碳酸盐矿物，可广泛地应用于建材、轻工、无机化工等领域。
综上所述，各种以氰化尾渣为主要原料制备高性能的建筑材料将成为发展的重要方向，氰化尾渣中的非金属矿物成分都与陶粒原料要求的成分相同，可以作为生产陶粒的主要原料，一般制备陶粒采用高温烧结的方式，考虑将高温烧结的方式与氯化焙烧的方法相结合，将重金属以氯化物的形式挥发除去并同步烧制陶粒，并将整个工艺控制在同一焙烧装备中完成，减少了工艺步骤，降低了能耗和污染。采用氰化尾渣焙烧回收有价金属同步制备陶粒的方法，不仅可以解决废渣所带来的环境问题，还可以实现废渣的无害化增值利用，创造巨大的经济效益。因此，本发明涉及的氰化尾渣焙烧回收有价金属同步制备陶粒的方法具有非常重要的意义和价值。
发明内容
本发明的目的是提供一种氰化尾渣焙烧回收有价金属同步制备陶粒的方法。通过焙烧回收氰化尾渣中的有价金属，同步制备高性能的陶粒，以此降低环境污染，提高经济效益，达到危废资源化回收和安全处置的效果。
该方法的具体工艺步骤如下:
(1)球磨混料：将氰化尾渣、膨润土、氯化钙、煤粉和钠长石按重量比为100:(5～10):(4～10):(1～7):(5～20)进行球磨混合，得到混合料；
(2)造粒：将步骤(1)所得混合料放入圆盘制粒机进行造粒，得到粒径为2～5cm的生料球；
(3)烘干：将步骤(2)中所得的生料球在100～200℃下烘干3～5h，得到烘干料；
(4)一次焙烧：将步骤(3)得到的烘干料进行一次焙烧，焙烧温度为700～900℃，焙烧时间为0.5～3h，得到一次焙烧料和烟尘；
(5)二次焙烧：将步骤(4)的到的一次焙烧料在高温下进行焙烧，焙烧温度为1050～1200℃，焙烧时间控制为0.5～3h，得到二次焙烧料和烟尘；
(6)收尘：将步骤(4)和(5)得到的烟尘进行收尘处理，得到多金属烟灰，进行集中处理；
(7)冷却：将步骤(5)得到的二次焙烧料进行冷却，得到陶粒。
进一步地，步骤(4)、(5)和(7)是在同一焙烧装备中进行。
制备得到的陶粒的重金属含量远低于《GB5085.3-2007》规定值，物理性能满足《GB/T 14685-2011》标准。与现有研究相比，本发明结合了氯化挥发以及陶粒制备的相关技术，不仅可以有效提高氰化尾渣中的重金属的挥发效率，而且可以同步烧制陶粒产品，既降低了对于环境的污染，也创造了经济价值。
本发明通过合理配料，在氰化尾渣焙烧和烧结过程中挥发回收有价金属并同步制备得到陶粒，达到氰化尾渣资源化回收和高值化利用的效果，可以创造良好的经济效益和环境效益，具有显著节能降耗效果。
附图说明
图1表示氰化尾渣焙烧回收有价金属同步制备陶粒工艺流程图
具体实施方式
实施例1:
(1)球磨混料：将氰化尾渣、膨润土、氯化钙、煤粉和钠长石按重量比为100:5:4:1:5进行球磨混合，得到混合料；
(2)造粒：将步骤(1)所得混合料放入圆盘制粒机进行造粒，得到粒径为2cm的生料球；
(3)烘干：将步骤(2)中所得的生料球在100℃下烘干3h，得到烘干料；
(4)一次焙烧：将步骤(3)得到的烘干料进行一次焙烧，焙烧温度为700℃，焙烧时间为0.5h，得到一次焙烧料和烟尘；
(5)二次焙烧：将步骤(4)的到的一次焙烧料在高温下进行焙烧，焙烧温度为1050℃，焙烧时间控制为0.5h，得到二次焙烧料和烟尘；
(6)收尘：将步骤(4)和(5)得到的烟尘进行收尘处理，得到多金属烟灰，进行集中处理；
(7)冷却：将步骤(5)得到的二次焙烧料进行冷却，得到陶粒。
通过本实施例方法，利用氰化尾渣烧制出的陶粒成品中几种重金属浸出含量为(mg/L)：Ag：0.0015，Cu：0.043，Zn：0.0013，As：0.0014，Pb：0.0015，Hg含量低于仪器检出限；陶粒物理性能如下：一小时吸水率为13％，堆积密度为1025kg/m 3，筒压强度为11.5MPa。
实施例2:
(1)球磨混料：将氰化尾渣、膨润土、氯化钙、煤粉和钠长石按重量比为100:10:10:7:20进行球磨混合，得到混合料；
(2)造粒：将步骤(1)所得混合料放入圆盘制粒机进行造粒，得到粒径为5cm的生料球；
(3)烘干：将步骤(2)中所得的生料球在200℃下烘干5h，得到烘干料；
(4)一次焙烧：将步骤(3)得到的烘干料进行一次焙烧，焙烧温度为900℃，焙烧时间为3h，得到一次焙烧料和烟尘；
(5)二次焙烧：将步骤(4)的到的一次焙烧料在高温下进行焙烧，焙烧温度为1200℃，焙烧时间控制为3h，得到二次焙烧料和烟尘；
(6)收尘：将步骤(4)和(5)得到的烟尘进行收尘处理，得到多金属烟灰，进行集中处理；
(7)冷却：将步骤(5)得到的二次焙烧料进行冷却，得到陶粒。
通过本实施例方法，利用氰化尾渣烧制出的陶粒成品中几种重金属浸出含量为(mg/L)：Ag：0.001，Cu：0.041，Zn：0.0011，As：0.0012，Pb：0.0013，Hg含量低于仪器检出限；陶粒物理性能如下：一小时吸水率为15％，堆积密度为1150kg/m 3，筒压强度为12.5MPa。
实施例3:
(1)球磨混料：将氰化尾渣、膨润土、氯化钙、煤粉和钠长石按重量比为100:7:5:3:10进行球磨混合，得到混合料；
(2)造粒：将步骤(1)所得混合料放入圆盘制粒机进行造粒，得到粒径为3cm的生料球；
(3)烘干：将步骤(2)中所得的生料球在150℃下烘干4h，得到烘干料；
(4)一次焙烧：将步骤(3)得到的烘干料进行一次焙烧，焙烧温度为800℃，焙烧时间为1h，得到一次焙烧料和烟尘；
(5)二次焙烧：将步骤(4)的到的一次焙烧料在高温下进行焙烧，焙烧温度为1100℃，焙烧时间控制为1h，得到二次焙烧料和烟尘；
(6)收尘：将步骤(4)和(5)得到的烟尘进行收尘处理，得到多金属烟灰，进行集中处理；
(7)冷却：将步骤(5)得到的二次焙烧料进行冷却，得到陶粒。
通过本实施例方法，利用氰化尾渣烧制出的陶粒成品中几种重金属浸出含量为(mg/L)：Ag：0.001，Cu：0.047，Zn：0.001，As：0.0014，Pb：0.0017， Hg含量低于仪器检出限；陶粒物理性能如下：一小时吸水率为12.4％，堆积密度为1035kg/m 3，筒压强度为11.7MPa。
实施例4:
(1)球磨混料：将氰化尾渣、膨润土、氯化钙、煤粉和钠长石按重量比为100:5:4:1:5进行球磨混合，得到混合料；
(2)造粒：将步骤(1)所得混合料放入圆盘制粒机进行造粒，得到粒径为5cm的生料球；
(3)烘干：将步骤(2)中所得的生料球在100℃下烘干3h，得到烘干料；
(4)一次焙烧：将步骤(3)得到的烘干料进行一次焙烧，焙烧温度为900℃，焙烧时间为3h，得到一次焙烧料和烟尘；
(5)二次焙烧：将步骤(4)的到的一次焙烧料在高温下进行焙烧，焙烧温度为1050℃，焙烧时间控制为0.5h，得到二次焙烧料和烟尘；
(6)收尘：将步骤(4)和(5)得到的烟尘进行收尘处理，得到多金属烟灰，进行集中处理；
(7)冷却：将步骤(5)得到的二次焙烧料进行冷却，得到陶粒。
通过本实施例方法，利用氰化尾渣烧制出的陶粒成品中几种重金属浸出含量为(mg/L)：Ag：0.0011，Cu：0.041，Zn：0.0016，As：0.0013，Pb：0.0016，Hg含量低于仪器检出限；陶粒物理性能如下：一小时吸水率为13.4％，堆积密度为1013kg/m 3，筒压强度为11.3MPa。
实施例5:
(1)球磨混料：将氰化尾渣、膨润土、氯化钙、煤粉和钠长石按重量比为100:10:10:7:20进行球磨混合，得到混合料；
(2)造粒：将步骤(1)所得混合料放入圆盘制粒机进行造粒，得到粒径为2cm的生料球；
(3)烘干：将步骤(2)中所得的生料球在200℃下烘干5h，得到烘干料；
(4)一次焙烧：将步骤(3)得到的烘干料进行一次焙烧，焙烧温度为700℃，焙烧时间为0.5h，得到一次焙烧料和烟尘；
(5)二次焙烧：将步骤(4)的到的一次焙烧料在高温下进行焙烧，焙烧温度为1200℃，焙烧时间控制为3h，得到二次焙烧料和烟尘；
(6)收尘：将步骤(4)和(5)得到的烟尘进行收尘处理，得到多金属烟灰，进行集中处理；
(7)冷却：将步骤(5)得到的二次焙烧料进行冷却，得到陶粒。
通过本实施例方法，利用氰化尾渣烧制出的陶粒成品中几种重金属浸出含量为(mg/L)：Ag：0.0014，Cu：0.045，Zn：0.0012，As：0.0017，Pb：0.0018，Hg含量低于仪器检出限；陶粒物理性能如下：一小时吸水率为11.3％，堆积密度为965kg/m 3，筒压强度为10.8MPa。
实施例6:
(1)球磨混料：将氰化尾渣、膨润土、氯化钙、煤粉和钠长石按重量比为100:8:7:5:15进行球磨混合，得到混合料；
(2)造粒：将步骤(1)所得混合料放入圆盘制粒机进行造粒，得到粒径为4cm的生料球；
(3)烘干：将步骤(2)中所得的生料球在170℃下烘干4h，得到烘干料；
(4)一次焙烧：将步骤(3)得到的烘干料进行一次焙烧，焙烧温度为850℃，焙烧时间为2h，得到一次焙烧料和烟尘；
(5)二次焙烧：将步骤(4)的到的一次焙烧料在高温下进行焙烧，焙烧温度为1150℃，焙烧时间控制为2h，得到二次焙烧料和烟尘；
(6)收尘：将步骤(4)和(5)得到的烟尘进行收尘处理，得到多金属烟灰，进行集中处理；
(7)冷却：将步骤(5)得到的二次焙烧料进行冷却，得到陶粒。
通过本实施例方法，利用氰化尾渣烧制出的陶粒成品中几种重金属浸出含量为(mg/L)：Ag：0.001，Cu：0.047，Zn：0.001，As：0.0014，Pb：0.0017，Hg含量低于仪器检出限；陶粒物理性能如下：一小时吸水率为11.4％，堆积密度为985kg/m 3，筒压强度为10.5MPa。
从以上实施例的结果来看，采用本发明提供的一种氰化尾渣焙烧回收有价金属同步制备陶粒的方法，该方法将氰化尾渣与氯化剂等原料进行合理配料，球磨混合后制成生料球，通过两次焙烧的方法，使得尾渣中的重金属以氯化物的形式挥发，对挥发的烟尘统一收集，并集中处理，挥发后的球粒烧制成符合国家标准且性能良好的陶粒成品。该方法不仅可以有效去除氰化尾渣中的多种金属，且该方法结合了氯化挥发新工艺，具有挥发率高、节能、无污染、适应范围广等特点，既可以消除对环境的污染，又能同步将挥发后的球粒烧制成陶粒，同时获得环境效益与经济效益。
以上对本发明在具体实施方式中的具体技术特征进行了详细的描述，但并不局限于以上具体技术特征，在不违背科学及本发明思想的情况下，不同的实施方式之间也可以进行任意组合，其同样应当视为本发明所公开的内容。为了避免不必要的重复，本发明对各种可能的组合方式不再另行说明。

Claims (2)

  1. 一种氰化尾渣焙烧回收有价金属同步制备陶粒的方法，其特征在于具体步骤如下:
    (1)球磨混料：将氰化尾渣、膨润土、氯化钙、煤粉和钠长石按一定重量比进行球磨混合，得到混合料；混合料中氰化尾渣、膨润土、氯化钙以、煤粉、钠长石重量比为100:(5～10):(4～10):(1～7):(5～20)；
    (2)造粒：将步骤(1)所得混合料放入圆盘制粒机进行造粒，得到粒径为2～5cm的生料球；
    (3)烘干：将步骤(2)中所得的生料球在100～200℃下烘干3～5h，得到烘干料；
    (4)一次焙烧：将步骤(3)得到的烘干料进行一次焙烧，得到一次焙烧料和烟尘；焙烧温度为700～900℃，焙烧时间为0.5～3h；
    (5)二次焙烧：将步骤(4)的到的一次焙烧料在高温下进行焙烧，得到二次焙烧料和烟尘；焙烧温度为1050～1200℃，焙烧时间控制为0.5～3h；
    (6)收尘：将步骤(4)和(5)得到的烟尘进行收尘处理，得到多金属烟灰，进行集中处理；
    (7)冷却：将步骤(5)得到的二次焙烧料进行冷却，得到陶粒。
  2. 根据权利要求1要求的一种氰化尾渣焙烧回收有价金属同步制备陶粒的方法，其特征在于步骤(4)、(5)和(7)是在同一焙烧装备中进行。
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