Preparation of Calcium Stannate from Lead Refining Dross by Roast–Leach–Precipitation Process

Abstract

Lead refining dross containing plenty of tin and other heavy metals, such as lead and antimony, is considered a hazardous waste generated in large quantities in lead smelter plants. In this study, calcium stannate was synthesized from lead refining dross using sodium carbonate roasting and alkaline leaching followed by precipitation with CaO. The effect of roasting and leaching parameters on the extraction efficiency of tin was investigated. The leaching efficiency of tin reached 94% under the optimized conditions: roasting with 60% Na2CO3 at 1000 °C for 45 min, and leaching using 2 mol/L NaOH solution for 90 min at 85 °C and 8 cm3/g liquid/solid ratio. Furthermore, more than 99% of tin in the leaching solution was precipitated using CaO. Finally, XRD, SEM, and ICP-OES analyses indicated that the final CaSnO3 product had a purity of 95.75% and its average grain size was smaller than 5 μm. The results indicated that the developed method is feasible to produce calcium stannate from lead refining dross.

Multielemental Isotopic Analysis for Trace Metals in Geochemical Samples, Part 1: Dissolved Iron, Nickel, Copper, Zinc, Cadmium, and Lead in Seawater

“…Moreover, the recoveries of V and Sn also significantly decreased with 0.03 mol/L NH 3 solution. At pH 11 with 0.03 mol/L NH 3 solution, V, Mo, and Sn exist as VO 3 (OH) 2 – , MoO 4 2– , and SnO 3 2– , respectively, − whereas ethylenediaminetriacetic acid and iminodiacetic acid (the functional groups of the NOBIAS Chelate PA1 resin) dissociate protons and transform to anions. Thus, electrostatic repulsion occurs, leading to dissociation of the chelate complexes of V, Mo, and Sn with functional groups of the NOBIAS Chelate PA1 resin.…”

“…In the isotopic measurement of Cu, 23 S7 show that the Na, Mg, Cr, Mn, Ti, and Ba contents were less than 1.4% of Cu, which is below the threshold for significant interference. 18 In the isotopic measurement of Zn, 40 S7 demonstrate Mg, Al, Ca, Ti, V, Cr, and Ba contents below 0.7% of Zn, which is well below the threshold for causing significant interference.…”

“…Second, coexisting elements in seawater interfere with MC-ICP-MS measurements. High concentrations of alkali and alkaline earth metals in seawater form molecular ions in MC-ICP-MS, causing spectral interference as 40 Ca 16 O + and 42 Ca 16 O + on Fe isotopes, 42 Ca 16 O + and 44 Ca 16 O + on Ni isotopes, 40 Ar 23 Na + and 40 Ar 25 Mg + on Cu isotopes, and 26 Mg 40 Ar + on Zn isotopes. Furthermore, MoO + ions cause significant spectral interference on Cd isotopes, which is particularly problematic owing to the high Mo concentration in seawater (reaching 100 nmol/kg) and low Cd concentration (0−1 nmol/kg).…”

Effect of Quartz on the Preparation of Sodium Stannate from Cassiterite Concentrates by Soda Roasting Process

“…However, metallic tin was always obtained from high-temperature reduction smelting process. Besides, some secondary tin-containing resources, including stanniferous alloy, tin scrap, waste solder, and electronic waste, have also been used for preparing sodium stannate [7][8][9][10][11][12][13], and these processes would cause high production cost and long process flow. In addition, the emission of hazardous gases (NH 3 and NOx) deriving from the oxidizers (NaNO 3 ) was also a shortcoming.…”