The effects of several collectors and their dosage on pure ilmenorutile atdifferent pH values were studied and the collecting strength of several representative collectorswas investigated. The experimental results ind...The effects of several collectors and their dosage on pure ilmenorutile atdifferent pH values were studied and the collecting strength of several representative collectorswas investigated. The experimental results indicate that diphosphonic acid is a good collector forilmenorutile and the recovery of ilmenorutile ranges from 90.87 percent to 91.70 percent when thepulp pH value is 2.0-4.0 and the dosage is 75 mg/L. The sequence of collecting ability for severalcollectors is as follows: diphosphonic acid> TF279 > cyclic allryl hydroximic acid > benzyl arsenicacid> salicylic hydroximic acid> alkyl hydroximic acid. Meanwhile, IAS (infrared absorptionspectrum) and XPS (X-ray photoelectron spectroscopy) were used to detect and analyze the actionmechanism of diphosphonic acid on ilmenorutile. IAS results showed that the characteristicabsorption peak relating to P=O as well as P-O vibration occurred between wave numeber 1140 and 1032cm^(-1), and diphosphonic acid had adsorbed on the surface of ilmenorutile. XPS results indicatedthat the binding energy of P2P peak of ilmenorutile had changed 0.45 eV after treated bydiphosphonic acid. This proves that the adsorption is mainly chemical adsorption.展开更多
The effect of several collectors on the niobite synthetized under the condition of varying pH values and dosages were studied. The collecting property of several representative collectors was also investigated. The e...The effect of several collectors on the niobite synthetized under the condition of varying pH values and dosages were studied. The collecting property of several representative collectors was also investigated. The experimental result shows that di- phosphonic acid is a good collector for niobite. Its recovery is about 84.24%-91.17% when the pH value of the pulp is less than 5.0 and the dosage of diphosphonic acid is 140 mg/L. The sequences of the selectivity and collecting capacity of the collectors were compared. Infrared absorption spectrum (IAS) and X-ray photoelectron spectroscopy (XPS) were used to detect and analyze the ad- sorption mechanism of diphosphonic acid on the surface of niobite. The IAS result indicates that diphosphonic acid is indeed ad- sorbed on the surface of niobite, and the XPS result shows that the binding energy of P2p peak of niobite treated by diphosphonic acid has changed 2.85 eV. It confirms that the adsorption belongs to a chemisorption type.展开更多
The flotation ofniobite, fersmite, and ilmenorutile was studied using 3 collectors with various concentration and pulp pH. The collecting property of different representative collectors was investigated. Experimental ...The flotation ofniobite, fersmite, and ilmenorutile was studied using 3 collectors with various concentration and pulp pH. The collecting property of different representative collectors was investigated. Experimental results show that diphosphonic acid is an effective collector for valuable niobium-containing minerals. A flotation recovery of 90.87%-91.7% is obtained with 75 mg/L diphosphonic acid at pH 2-4. The chemical adsorption of diphosphonic acid on these 3 minerals＇ surface might lead to the high recovery efficiency of the minerals, which is proved by IR and X-ray photoelectron spectroscopy spectra.展开更多
文摘The effects of several collectors and their dosage on pure ilmenorutile atdifferent pH values were studied and the collecting strength of several representative collectorswas investigated. The experimental results indicate that diphosphonic acid is a good collector forilmenorutile and the recovery of ilmenorutile ranges from 90.87 percent to 91.70 percent when thepulp pH value is 2.0-4.0 and the dosage is 75 mg/L. The sequence of collecting ability for severalcollectors is as follows: diphosphonic acid> TF279 > cyclic allryl hydroximic acid > benzyl arsenicacid> salicylic hydroximic acid> alkyl hydroximic acid. Meanwhile, IAS (infrared absorptionspectrum) and XPS (X-ray photoelectron spectroscopy) were used to detect and analyze the actionmechanism of diphosphonic acid on ilmenorutile. IAS results showed that the characteristicabsorption peak relating to P=O as well as P-O vibration occurred between wave numeber 1140 and 1032cm^(-1), and diphosphonic acid had adsorbed on the surface of ilmenorutile. XPS results indicatedthat the binding energy of P2P peak of ilmenorutile had changed 0.45 eV after treated bydiphosphonic acid. This proves that the adsorption is mainly chemical adsorption.
文摘The effect of several collectors on the niobite synthetized under the condition of varying pH values and dosages were studied. The collecting property of several representative collectors was also investigated. The experimental result shows that di- phosphonic acid is a good collector for niobite. Its recovery is about 84.24%-91.17% when the pH value of the pulp is less than 5.0 and the dosage of diphosphonic acid is 140 mg/L. The sequences of the selectivity and collecting capacity of the collectors were compared. Infrared absorption spectrum (IAS) and X-ray photoelectron spectroscopy (XPS) were used to detect and analyze the ad- sorption mechanism of diphosphonic acid on the surface of niobite. The IAS result indicates that diphosphonic acid is indeed ad- sorbed on the surface of niobite, and the XPS result shows that the binding energy of P2p peak of niobite treated by diphosphonic acid has changed 2.85 eV. It confirms that the adsorption belongs to a chemisorption type.
文摘The flotation ofniobite, fersmite, and ilmenorutile was studied using 3 collectors with various concentration and pulp pH. The collecting property of different representative collectors was investigated. Experimental results show that diphosphonic acid is an effective collector for valuable niobium-containing minerals. A flotation recovery of 90.87%-91.7% is obtained with 75 mg/L diphosphonic acid at pH 2-4. The chemical adsorption of diphosphonic acid on these 3 minerals＇ surface might lead to the high recovery efficiency of the minerals, which is proved by IR and X-ray photoelectron spectroscopy spectra.
