JP2005272955A - Treatment method for fly ash - Google Patents
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- JP2005272955A JP2005272955A JP2004089585A JP2004089585A JP2005272955A JP 2005272955 A JP2005272955 A JP 2005272955A JP 2004089585 A JP2004089585 A JP 2004089585A JP 2004089585 A JP2004089585 A JP 2004089585A JP 2005272955 A JP2005272955 A JP 2005272955A
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Abstract
Description
本発明は、飛灰の処理方法に関し、特に、シュレッダーダストなどの廃棄物を焼却した際に発生する飛灰から重金属類を回収して再資源化する方法に関する。 The present invention relates to a method for treating fly ash, and more particularly to a method for recovering and recycling heavy metals from fly ash generated when incineration of waste such as shredder dust.
従来、廃自動車からのボディ殻や廃家電製品などをシュレッダーにより破砕して金属を回収した後のシュレッダーダストと呼ばれるプラスチック屑は、減容化のために焼却処理または溶融処理され、その際に焼却処理設備または溶融処理設備（減容化設備）の集塵機などにおいて発生する飛灰（焼却飛灰または溶融飛灰）は、資源化できずにそのまま最終処分場に廃棄されるか、あるいはキレート処理して重金属を不溶化処理した後に最終処分場に廃棄されていた。 Conventionally, plastic scraps, called shredder dust, after shattering body shells and waste home appliances from scrapped cars and collecting metal, are incinerated or melted for volume reduction. Fly ash (incineration fly ash or molten fly ash) generated in dust collectors of treatment facilities or melting treatment facilities (volume reduction facilities) cannot be recycled and is either discarded directly to the final disposal site or chelated. The heavy metals were insolubilized and then discarded at the final disposal site.
このようなシュレッダーダストなどの廃棄物を焼却した際に発生する飛灰を資源化する方法として、飛灰から非鉄金属などを選別して回収し、さらに重金属類および塩素分を除去して、セメント材料などの資源材として利用する方法が知られている（例えば、特許文献１参照）。 As a method of recycling fly ash generated when incinerating waste such as shredder dust, nonferrous metals are selected and collected from fly ash, and heavy metals and chlorine are removed to make cement. A method of using it as a resource material such as a material is known (see, for example, Patent Document 1).
また、シュレッダーダストなどの廃棄物を焼却した際に発生する飛灰を資源化する方法として、飛灰を水洗などにより脱塩素処理した後、あるいは飛灰をそのまま銅製錬の原料として処理する方法が知られている。 In addition, as a method of recycling fly ash generated when incineration of waste such as shredder dust, there is a method of treating fly ash as a raw material for copper smelting after dechlorination of fly ash by washing or the like. Are known.
しかし、シュレッダーダストなどの廃棄物を焼却した際に発生する飛灰には、銅（Ｃｕ）や亜鉛（Ｚｎ）が含まれており、飛灰をそのまま最終処分場に廃棄する場合には、これらのＣｕやＺｎを資源化することができない。 However, fly ash generated when incinerating waste such as shredder dust contains copper (Cu) and zinc (Zn). Cu and Zn cannot be made into resources.
また、飛灰を銅製錬の原料として処理する場合には、Ｚｎを資源化することができず、また、飛灰のＣｕ品位が低いためにＣｕの回収率が低下してコストが増大するとともに、飛灰に随伴するアルミナなどによりスラグの粘性が増大して操業コストが上昇するという問題がある。さらに、塩素などによって排ガス処理設備の腐食が進行するという問題もある。 Moreover, when fly ash is processed as a raw material for copper smelting, Zn cannot be recycled, and the Cu recovery rate is low due to the low Cu quality of fly ash, which increases costs. In addition, there is a problem that the operating cost increases due to the viscosity of the slag being increased by alumina accompanying the fly ash. Further, there is a problem that the exhaust gas treatment equipment is corroded by chlorine or the like.
また、飛灰を水洗などにより脱塩素処理した後に銅製錬の原料として処理する場合にも、Ｚｎを資源化することができず、また、洗浄した飛灰のＣｕ品位が低いためにＣｕの回収率が低下してコストが増大するとともに、飛灰に随伴するアルミナなどによりスラグの粘性が増大して操業コストが上昇するという問題がある。 In addition, even when fly ash is treated as a raw material for copper smelting after dechlorination treatment by washing with water or the like, Zn cannot be recycled, and Cu is recovered because the Cu quality of the washed fly ash is low. There is a problem that the rate is lowered and the cost is increased, and the viscosity of the slag is increased by alumina accompanying the fly ash and the operation cost is increased.
そのため、本発明者らは、シュレッダーダストなどの廃棄物を焼却した際に発生する飛灰からＣｕを回収するために、飛灰を水にリパルプ（懸濁）させ、捕集剤を添加して浮遊選鉱を行うことを試みたが、浮遊性が全く認められなかった。また、飛灰を水にリパルプ（懸濁）させ、水硫化ソーダを添加して硫化した後、捕集剤を添加して浮遊選鉱を行うことも試みたが、浮遊性が全く認められなかった。さらに、飛灰を水にリパルプ（懸濁）させ、水硫化ソーダを添加して硫化した後、ｐＨを上げる捕集剤を添加して浮遊選鉱を行ったところ、浮遊選鉱によりＣｕが硫化物として浮鉱に濃縮されたが、浮鉱のＣｕ品位が２０％であり、回収率が６９％と十分ではなかった。 Therefore, the present inventors repulped the fly ash into water (suspended) in order to recover Cu from the fly ash generated when the waste such as shredder dust is incinerated, and added a collecting agent. An attempt was made to flotation, but no flotation was observed. In addition, the fly ash was repulped (suspended) in water, added with sodium hydrosulfide, and then sulfided, and then tried to perform flotation by adding a scavenger, but no buoyancy was observed. . Furthermore, fly ash was repulped (suspended) in water, and sodium hydrosulfide was added to sulfidize, and then the flotation was performed by adding a scavenger that raises the pH. Cu was converted to sulfide by flotation. Although concentrated in the float, the Cu grade of the float was 20%, and the recovery rate was 69%, which was not sufficient.
したがって、本発明は、このような従来の問題点に鑑み、シュレッダーダストなどの廃棄物を焼却した際に発生する飛灰から重金属類を高回収率で回収して製錬原料などに再資源化することができる、飛灰の処理方法を提供することを目的とする。 Therefore, in view of such conventional problems, the present invention recovers heavy metals from fly ash generated when waste such as shredder dust is incinerated at a high recovery rate and recycles it into smelting raw materials. An object of the present invention is to provide a method for treating fly ash.
本発明者らは、上記課題を解決するために鋭意研究した結果、飛灰を含むスラリーのｐＨを３以下に調整して重金属をイオン化する酸浸出を行った後に、浮遊選鉱により重金属を分離回収することにより、シュレッダーダストなどの廃棄物を焼却した際に発生する飛灰から重金属類を高回収率で回収して製錬原料などに再資源化することができることを見出し、本発明を完成するに至った。 As a result of diligent research to solve the above-mentioned problems, the present inventors have carried out acid leaching to adjust the pH of a slurry containing fly ash to 3 or less and ionize heavy metals, and then separate and recover heavy metals by flotation. By doing so, it has been found that heavy metals can be recovered from fly ash generated when incineration of waste such as shredder dust at a high recovery rate and recycled into smelting raw materials, etc., and the present invention is completed. It came to.
すなわち、本発明による飛灰の処理方法は、飛灰を含むスラリーに塩酸などの酸を加えてｐＨ３以下に調整して重金属をイオン化する酸浸出工程を行った後、浮遊選鉱により重金属を分離回収する重金属回収工程を行うことを特徴とする。この飛灰の処理方法において、飛灰が、純水に溶かしたときに酸性を示す（ｐＨが７未満になる）飛灰であるのが好ましい。また、酸浸出工程においてｐＨを１〜２に調整するのが好ましい。また、重金属回収工程は、銅を回収する銅回収工程と、亜鉛を回収する亜鉛回収工程とを含むのが好ましい。銅回収工程は、酸浸出工程後の溶液に抑制剤、捕集剤および起泡剤を添加して浮遊選鉱を行う工程であるのが好ましく、亜鉛回収工程は、銅回収工程後の溶液に抑制剤および捕集剤を添加して浮遊選鉱を行う工程であるのが好ましい。さらに、重金属回収工程を行う前に、酸浸出工程後の溶液に硫化剤を添加する硫化工程を行うのが好ましく、硫化剤が、硫化水素ガス、水硫化ソーダおよび硫化ソーダからなる群から選ばれる硫化剤であるのが好ましい。 That is, the fly ash treatment method according to the present invention performs an acid leaching process in which acid such as hydrochloric acid is added to a slurry containing fly ash to adjust the pH to 3 or less to ionize heavy metals, and then heavy metals are separated and recovered by flotation. And performing a heavy metal recovery step. In this fly ash treatment method, the fly ash is preferably fly ash which shows acidity (pH becomes less than 7) when dissolved in pure water. Moreover, it is preferable to adjust pH to 1-2 in an acid leaching process. The heavy metal recovery step preferably includes a copper recovery step for recovering copper and a zinc recovery step for recovering zinc. The copper recovery step is preferably a step of performing flotation by adding an inhibitor, a scavenger and a foaming agent to the solution after the acid leaching step, and the zinc recovery step is suppressed to a solution after the copper recovery step. It is preferable that the step of flotation be carried out by adding an agent and a scavenger. Furthermore, it is preferable to perform a sulfiding step of adding a sulfiding agent to the solution after the acid leaching step before performing the heavy metal recovery step, and the sulfiding agent is selected from the group consisting of hydrogen sulfide gas, sodium hydrosulfide and sodium sulfide. A sulfiding agent is preferred.
本発明によれば、シュレッダーダストなどの廃棄物を焼却した際に発生する飛灰から、銅や亜鉛などの重金属類を高回収率で回収して製錬原料などに再資源化することができる。 ADVANTAGE OF THE INVENTION According to this invention, heavy metals, such as copper and zinc, can be collect | recovered with high recovery from the fly ash which generate | occur | produces when wastes, such as shredder dust, are incinerated, and can be recycled to a smelting raw material etc. .
本発明による飛灰の処理方法の実施の形態は、シュレッダーダストなどの廃棄物を焼却した際に発生する飛灰を含み水に酸を加えてＣｕやＺｎなどの重金属類をイオン化する酸浸出工程と、ＣｕイオンやＺｎイオンと未溶解残渣を含む懸濁液に硫化剤を添加してＣｕやＺｎを硫化物に転換する硫化工程と、懸濁液に抑制剤、捕集剤および起泡剤を添加して浮遊選鉱を行うことによりＣｕを含む硫化物を澱物として回収するＣｕ回収工程と、Ｃｕを浮選分離した懸濁液に更に水硫化ソーダまたは苛性ソーダなどでｐＨ調整して浮遊選鉱を行うことによりＺｎを含む硫化物を澱物として回収するＺｎ回収工程とを含む。以下、これらの工程について詳述する。 The embodiment of the method for treating fly ash according to the present invention includes an acid leaching step of ionizing heavy metals such as Cu and Zn by adding acid to water containing fly ash generated when incineration of waste such as shredder dust. A sulfiding step of adding a sulfiding agent to a suspension containing Cu ions or Zn ions and an undissolved residue to convert Cu or Zn into a sulfide, and an inhibitor, a scavenger and a foaming agent in the suspension A Cu recovery step for recovering Cu-containing sulfide as a starch by performing flotation with addition of selenium, and further adjusting the pH of the suspension obtained by flotation separation of Cu with sodium hydrosulfide or caustic soda to perform flotation And a Zn recovery step of recovering a sulfide containing Zn as a starch. Hereinafter, these steps will be described in detail.
（酸浸出工程）
まず、シュレッダーダストなどの廃棄物を焼却した際に発生する飛灰を純水に浸し、酸を加えてｐＨを３以下に調整して、飛灰中のＣｕやＺｎの浸出率を高める。ｐＨが２より高いと浸出率が低く、一方、ｐＨが１より低いと浮遊選鉱におけるｐＨ調整のための中和剤の使用量が多くなるため、ｐＨの範囲は１〜２であるのが好ましい。使用する酸として、塩酸の他、硫酸や硝酸などの酸を使用することもできるが、硫酸を使用すると、飛灰中のＣａと反応して石膏を生成するために残渣の発生量が多くなって廃棄物の量が増加し、硝酸を使用すると、コストが増大するので、塩酸を使用するのが好ましい。この酸浸出工程では、ＣｕおよびＺｎを溶液に移行させることによりＣｕおよびＺｎの回収の選択性を向上させる。
(Acid leaching process)
First, fly ash generated when waste such as shredder dust is incinerated is immersed in pure water, and an acid is added to adjust the pH to 3 or less, thereby increasing the leaching rate of Cu and Zn in the fly ash. When the pH is higher than 2, the leaching rate is low. On the other hand, when the pH is lower than 1, the amount of the neutralizing agent used for pH adjustment in the flotation is increased, so the pH range is preferably 1-2. . Acids such as sulfuric acid and nitric acid can be used in addition to hydrochloric acid as the acid to be used. However, when sulfuric acid is used, the amount of residue generated increases because it reacts with Ca in fly ash to produce gypsum. Since the amount of waste increases and the use of nitric acid increases the cost, it is preferable to use hydrochloric acid. In this acid leaching step, Cu and Zn are transferred to a solution to improve the selectivity of Cu and Zn recovery.
（硫化工程）
次に、浸出したＣｕイオンやＺｎイオンを浮遊選鉱で回収し易い硫化物に転換して分離し易くする。この硫化工程では、未溶解残渣を濾過しないで硫化剤を添加することにより、溶解しないで残っている残渣のＣｕやＺｎの粒子の表面を硫化して、ＣｕおよびＺｎの回収率を向上させる。ただし、残渣の発生率が低い場合には、未溶解残渣をろ過した後に硫化剤を添加してもよい。硫化剤としては、硫化水素ガス、水硫化ソーダ、硫化ソーダなど、水に溶解してＳ２−を放出するものであれば、どのような硫化剤でもよいが、浮遊選鉱時のｐＨ調整の容易さを考慮して、水硫化ソーダを使用するのが好ましい。
(Sulfurization process)
Next, the leached Cu ions and Zn ions are converted to sulfides that can be easily recovered by flotation to facilitate separation. In this sulfurization step, the surface of the remaining Cu or Zn particles remaining without being dissolved is sulfided by adding a sulfurizing agent without filtering undissolved residues, thereby improving the recovery rate of Cu and Zn. However, when the residue generation rate is low, a sulfurizing agent may be added after filtering the undissolved residue. As the sulfiding agent, any sulfiding agent may be used as long as it dissolves in water and releases S 2− , such as hydrogen sulfide gas, sodium hydrosulfide, and sodium sulfide. In view of this, it is preferable to use sodium hydrosulfide.
（Ｃｕ回収工程）
次に、懸濁液に抑制剤、捕集剤および起泡剤を添加して浮遊選鉱を行うことにより銅硫化物を澱物として回収する。捕集剤としては、エチルキサントゲン酸カリウム（ＫＥＸ）などを使用することができ、起泡剤としては、メチルイソブチルカルビノール（ＭＩＢＣ（Ｍｅｔｈｙｌ ＩｓｏＢｕｔｙｌ Ｃａｒｂｉｎｏｌ））などを使用することができる。また、抑制剤としてケイ酸ナトリウム（Ｎａ２ＳｉＯ３）を添加することにより、Ｚｎなどの硫化物の浮遊を抑えることができる。なお、銅硫化物の浮遊選鉱のための懸濁液のｐＨは１〜２の範囲が好ましい。このように、銅硫化物として浮鉱にＣｕを濃縮して回収することにより、銅の資源化を図ることができる。
(Cu recovery process)
Next, an inhibitor, a scavenger and a foaming agent are added to the suspension, and the copper sulfide is recovered as a starch by performing flotation. As the collecting agent, potassium ethyl xanthate (KEX) or the like can be used, and as the foaming agent, methyl isobutyl carbinol (MIBC (Methyl IsoButyl Carbinol)) or the like can be used. Further, by adding
（Ｚｎ回収工程）
Ｃｕの回収後、ｐＨを３前後に調整し、抑制剤および捕集剤を添加して、亜鉛硫化物の浮遊選鉱を行う。亜鉛の浮遊選鉱のための液のｐＨは３〜４が好ましい。このように、硫化亜鉛として浮鉱にＺｎを回収することにより、Ｚｎの資源化を図ることができる。
(Zn recovery process)
After the recovery of Cu, the pH is adjusted to around 3, and an inhibitor and a scavenger are added to carry out the flotation of zinc sulfide. The pH of the solution for the flotation of zinc is preferably 3-4. In this manner, by recovering Zn in the float ore as zinc sulfide, it is possible to make the resource of Zn.
（塩類回収工程）
Ｚｎの回収後に残留する溶液を中和してｐＨ７〜８に調整すれば、減圧蒸留によって塩化カルシウムや塩化ナトリウムを回収することができる。
(Salt recovery process)
If the solution remaining after the recovery of Zn is neutralized and adjusted to pH 7-8, calcium chloride and sodium chloride can be recovered by distillation under reduced pressure.
以下、本発明による飛灰の処理方法の実施例について詳細に説明する。 Hereinafter, embodiments of the fly ash treatment method according to the present invention will be described in detail.
［実施例１］
まず、シュレッダーダストなどの廃棄物を焼却した際に発生し、回収目的であるＣｕとＺｎを高濃度で含有する飛灰として、表１に示す組成を有し、純水に溶かしたときのｐＨが３．８の弱酸性を示す焼却飛灰を用意した。
[Example 1]
First, when waste such as shredder dust is incinerated, it has the composition shown in Table 1 as fly ash containing Cu and Zn at high concentration, which is the purpose of recovery, and the pH when dissolved in pure water Prepared incinerated fly ash having a weak acidity of 3.8.
この焼却飛灰１０ｇを純水に浸し、塩酸でｐＨを１．５に調整して、Ｃｕイオンを溶出させた後、硫化剤として水硫化ナトリウム（ＮａＳＨ）を添加し、ＣｕＳの沈殿を生成させた。この懸濁液に抑制剤として３ｋｇ／ｔのケイ酸ナトリウム（Ｎａ２ＳｉＯ３）を添加し、純水により２５０ｍｌのＭＳ型浮遊選鉱機に投入した。ここで、捕集剤として４ｋｇ／ｔのエチルキサントゲン酸カリウム（ＫＥＸ）、起泡剤としてメチルイソブチルカルビノール（ＭＩＢＣ）を使用して浮遊選鉱を行い、浮鉱側にＣｕＳを回収した。このとき、浮鉱側のＣｕ品位は４２．１％（元鉱１０．６％）であり、回収率は７６．２％であった。次に、沈鉱側からＺｎを回収するために、ＮａＳＨによって懸濁液のｐＨを３．０に調整し、２ｋｇ／ｔのＫＥＸと０．０５ｍＬのＭＩＢＣを添加して二次浮遊選鉱を行い、浮鉱側にＺｎを回収した。このとき、浮鉱側のＺｎ品位は８．９％（元鉱２．４％）であり、回収率は５５．１％であった。なお、回収物の定量分析および定性分析は、Ｘ線回折装置（ＸＲＤ）とＩＣＰ発光分析装置によって行った。 Soak 10 g of this incinerated fly ash in pure water, adjust the pH to 1.5 with hydrochloric acid, and elute Cu ions, then add sodium hydrosulfide (NaSH) as a sulfiding agent to form a CuS precipitate. It was. To this suspension, 3 kg / t sodium silicate (Na 2 SiO 3 ) was added as an inhibitor, and the purified suspension was charged into a 250 ml MS type flotation machine. Here, flotation was performed using 4 kg / t of ethyl xanthate potassium (KEX) as a scavenger and methyl isobutyl carbinol (MIBC) as a foaming agent, and CuS was recovered on the flotation side. At this time, the Cu grade on the floating ore side was 42.1% (original ore 10.6%), and the recovery rate was 76.2%. Next, in order to recover Zn from the sedimentation side, the pH of the suspension is adjusted to 3.0 with NaSH, and 2 kg / t KEX and 0.05 mL MIBC are added to perform secondary flotation. Zn was recovered on the float side. At this time, the Zn grade on the float side was 8.9% (original ore 2.4%), and the recovery rate was 55.1%. In addition, the quantitative analysis and qualitative analysis of the recovered material were performed using an X-ray diffractometer (XRD) and an ICP emission spectrometer.
このように、ＣｕやＺｎなどの重金属を非鉄金属製錬所の原料として使用可能な品位まで高めて回収することができた。 Thus, it was possible to recover heavy metals such as Cu and Zn to a quality that can be used as raw materials for non-ferrous metal smelters.
［実施例２］
実施例１において硫化処理によって生成したＣｕＳの表面の性質を明らかにするために、沈殿物として回収したＣｕのゼータ電位を測定した。この結果を図１に示す。この結果からｐＨ１．５においてＣｕＳが最大の電位１９．６ｍＶを示すことがわかった。また、ＫＥＸは陰イオン系捕集剤であることから、比較的広いｐＨでＣｕＳと電気的な作用に基づく捕集（吸着）が起こると考えられ、ｐＨ１．５において最もその効果が高いと推測される。さらに、ｐＨ１．５ではＣｕＳの分散性が良好であると考えられることから、実施例１のようにｐＨ１．５で浮遊選鉱を行うのが好ましいことがわかった。
[Example 2]
In order to clarify the surface properties of CuS produced by sulfiding treatment in Example 1, the zeta potential of Cu recovered as a precipitate was measured. The result is shown in FIG. From this result, it was found that CuS showed the maximum potential of 19.6 mV at pH 1.5. In addition, since KEX is an anionic collector, it is considered that collection (adsorption) based on electrical action with CuS occurs at a relatively wide pH, and the effect is estimated to be highest at pH 1.5. Is done. Furthermore, since it is considered that the dispersibility of CuS is good at pH 1.5, it was found that it is preferable to perform flotation at pH 1.5 as in Example 1.
［実施例３］
実施例１における捕集剤の添加量を検討するために予備試験を行った結果、ＫＥＸを４ｋｇ／ｔ添加することにより浮鉱側でＣｕ品位および回収率がいずれも良好な結果を得ることができた。その結果を考慮して、抑制剤として添加するケイ酸ナトリウム（Ｎａ２ＳｉＯ３）の量に対する浮鉱側のＣｕ品位と回収率の関係を調べた。その結果として、浮鉱産物の品位を図２に示し、各成分の回収率を図３に示す。図２の結果から、添加するケイ酸ナトリウム（Ｎａ２ＳｉＯ３）の濃度が３ｋｇ／ｔ以上の場合に、浮鉱側のＣｕ品位が４０％以上の高濃度でＣｕを回収でき、また、図３の結果から、添加するケイ酸ナトリウム（Ｎａ２ＳｉＯ３）の濃度が３ｋｇ／ｔ以下の場合に、Ｃｕを７０％以上の回収率で回収できることがわかった。そこで、両者の結果から、添加するケイ酸ナトリウム（Ｎａ２ＳｉＯ３）の濃度を３ｋｇ／ｔにする場合に、Ｃｕ品位および回収率がいずれも良好な結果が得られることがわかった。
[Example 3]
As a result of conducting a preliminary test in order to examine the addition amount of the scavenger in Example 1, it is possible to obtain good results in both the Cu quality and the recovery rate on the floatation side by adding 4 kg / t of KEX. did it. Considering the result, the relationship between the float grade side Cu quality and the recovery rate with respect to the amount of sodium silicate (Na 2 SiO 3 ) added as an inhibitor was investigated. As a result, the grade of the floated product is shown in FIG. 2, and the recovery rate of each component is shown in FIG. From the results of FIG. 2, when the concentration of sodium silicate (Na 2 SiO 3 ) to be added is 3 kg / t or more, Cu can be recovered at a high concentration of 40% or more of the Cu grade on the float ore side. From the result of 3, it was found that when the concentration of sodium silicate (Na 2 SiO 3 ) to be added is 3 kg / t or less, Cu can be recovered at a recovery rate of 70% or more. From these results, it was found that when the concentration of sodium silicate (Na 2 SiO 3 ) to be added was 3 kg / t, good results were obtained for both the Cu quality and the recovery rate.
［実施例４］
実施例１において硫化剤を添加する前に未溶解残渣をろ過し、そのろ液に硫化剤を添加してＣｕＳの沈殿を生成させた以外は実施例１と同様の方法により、浮遊選鉱を行って浮鉱側にＣｕＳを回収した。このとき、浮鉱側のＣｕ品位は６０％（元鉱１０．６％）であり、回収率は６７．２％であった。なお、回収物の定量分析および定性分析は、Ｘ線回折装置（ＸＲＤ）とＩＣＰ発光分析装置によって行った。このように、Ｃｕを非鉄金属製錬所の原料として使用可能な高純度の品位まで高めて回収することができた。
[Example 4]
In Example 1, the undissolved residue was filtered before adding the sulfiding agent, and the flotation was performed in the same manner as in Example 1 except that the sulfiding agent was added to the filtrate to form a CuS precipitate. CuS was recovered on the floating side. At this time, the Cu grade on the floating ore side was 60% (original ore 10.6%), and the recovery rate was 67.2%. In addition, the quantitative analysis and qualitative analysis of the recovered material were performed using an X-ray diffractometer (XRD) and an ICP emission spectrometer. In this way, Cu could be recovered with a high purity grade that can be used as a raw material for non-ferrous metal smelters.
Claims (9)
9. The fly ash treatment method according to claim 8, wherein the sulfiding agent is a sulfiding agent selected from the group consisting of hydrogen sulfide gas, sodium hydrosulfide, and sodium sulfide.
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