containing arsenic(III) and arsenic(V) with the potential interfering metal. Total arsenic recoveries ranged from 92 to 102 percent for all metals tested except antimony(III) and antimony(V) which suppressed arsine formation when the antimony(III)/total arsenic molar ratio exceeded 4 or the antimony(V)/total arsenic molar ratio exceeded 2.

Selective precipitation of antimony orange waste, modified with Zr(IV) and Fe(III), is very effective for the adsorptive removal of antimony from aqueous media. The Precipitation is a useful technique for the recovery of ele- adsorption process can be satisfactorily explained by a ligand ments from solution.

The leaching of arsenic, antimony, and bismuth depends on leaching conditions like acid concentration, temperature, and oxidation potential. Precipitation is then carried out with pH control and/or reagents like SO2 as shown in Figure 2.

The present invention is concerned with a process for selectively removing antimony, bismuth, or both, from acidic solution by submitting the solution to oxidizing conditions thereby causing the selective precipitation of antimony and bismuth; filtering precipitated antimony and bismuth; and submitting the oxidized solution to reducing conditions before it is returned to the electrorefining cell.

Accordingly, up to 98% of arsenic was removed under optimum selective leaching conditions (30 g/L of sulfide sodium, 5 g/L of sodium hydroxide, at 85 °C, 15 min, and L/S ratio = 7). To immobilize arsenic from alkaline leaching, the precipitation method was used by finding optimum conditions (at Fe/As = 3, 25 °C and 12 h).

In the precipitation process, more than 99.93% of arsenic from the leaching solution is removed in the form of amorphous ferric arsenate, at pH 4.8 when Fe 3+ to arsenic and H 2 O 2 to arsenic molar ratios are set at 5:1 and 4:1, respectively.

U. S. DEPARTMENT OF COMMERCE NATIONAL BUREAU OF STANDARDS RESEARCH PAPER RP1116 Part of Journal of Research of the J{ational Bureau of Standards, Volume 21, July 1938 DETERMINATION OF ARSENIC, ANTIMONY, AND TIN IN LEAD~, TIN~, AND COPPER~BASE ALLOYS By John A. Scherrer ABSTRACT A method is described in which arsenic, antimony, and tin …

The recovery of antimony from high arsenic-bearing flue dusts was carried out by a selective oxidation roasting process using MnO 2, in which the arsenic was removed through a volatilization and antimony was oxidized to Sb 2 O 4 staying in the roasted products. In a certain range, the MnO 2 additive has an active effective on the arsenic volatilization for the reason that structures of some ...

Arsenic-containing industrial wastes contain high levels of hazardous arsenic compounds, for which proper pollution control and resource recovery is a high priority and a matter of great urgency. In this study, a process that combines alkaline leaching and acid precipitation was investigated with a view to extracting and recovering arsenic from the sludge-like waste generated …

quantities of stibnite. Arsenic minerals are present in smaller amounts. The pres-ence of these volatile impurities is detrimental to economic recovery of quicksilver by standard mercury-recovery techniques. At the Red Devil plant it was determined that nearly complete oxidation of the antimony and arsenic was required to effect

hydrometallurgical system as it is a very selective lixiviant for the distinct leaching of tin, gold, antimony, arsenic and mercury (1,2,3,4,5,6,7). Worldwide, it is employed industrially in the CIS, China and the United States for the production of antimony. (8,9,10,11,12,13,14,15)

The leaching patterns of arsenic and antimony as a function of temperature are similar to that of nickel. The concentration of these metalloids decreases as leaching temperature increases. However, as seen in Fig. 5, the removal of both metalloids is more favoured than that of nickel, obtaining concentrations of As and Sb below 1 and 8 mg L ...

Selective precipitation of arsenic was possible, but depended on speciation, S:As ratio and other metals present. Graphical Abstract. Download : Download high-res image ... Removal of antimony was only complete after 2 h. The time lag observed in the precipitation of antimony may imply a similar reduction mechanism to As(V) ...

About 90.06% arsenic and only about 6.89% antimony went into smoke under the condition of roasting temperature of 723.0 K, MnO 2 amount of 20.5%, and roasting time of 90 min. The MnO 2 selective oxida-tion provided a good separation of arsenic from high arsenic-bearing flue dusts. The left antimony …

PARTIAL ROASTING OF COPPER CONCENTRATE WITH STABILISATION OF ARSENIC AND MERCURY. Download. Related Papers. Enargite Treatments and Pressure Oxidation of Concentrates. By Co. SEP. 6 Lead and Zinc. By Mziyanda shumi.

Abstract The selective separation of arsenic in the NaOH-S system from arsenic dust containing Pb, Sb, and Zn was studied by central composite design response surface method in this investigation. The results indicated that the presence of elemental sulfur can prevent lead and antimony leaching from arsenic dust effectively. The optimal leaching conditions were …

It can be seen that the precipitation rate of arsenic can be controlled to within 10%, while the precipitation rates of lead, zinc and antimony exceed 97.1%, 99.8%, 58.9%, respectively. The deep removal of antimony will be investigated in future research.

As people in the art will now be in a position to appreciate, the method allows selective precipitation of iron, arsenic and antimony, in the presence of dissolved base metals including cobalt (Co 2+), nickel (Ni 2+), copper (Cu +2) and zinc (Zn +2), based on acid digestion of a polymetallic oxides substrate obtained directly as an ore, such as ...

Monoclinic pyrrhotite was found to be the most effective for copper sulfide precipitation, which can be used for the selective precipitation of copper ions from arsenic wastewater.

Elevated antimony concentrations extend over 8 km downstream from the source, whereas arsenic quickly attenuates within 1.5 km. High correlation between antimony/arsenic and iron concentrations in fine-fraction streambed sediment indicates that sorption and (co)precipitation with iron (hydr)oxides is an important pathway for the attenuation of ...

Antimony has become an increasingly critical element in recent years, due to a surge in industrial demand and the Chinese domination of primary production. Antimony is produced from stibnite ore (Sb2O3) which is processed into antimony metal and antimony oxide (Sb2O3). The industrial importance of antimony is mainly derived from its use as flame retardant in plastics, coatings, and …

US9222147B2 - Method for selective precipitation of iron, arsenic and antimony - Google Patents Method for selective precipitation of iron, arsenic and antimony Download PDF Info Publication number US9222147B2. US9222147B2 ...

metalloids, including arsenic, antimony, and selenium, in the natural environment is of great concern (Adriano, 1986; 1992), particularly near former mine sites, dumps, tailing piles, and impoundments, but also in urban areas and industrial centers. Soil, sediment, water, and organic materials in these areas may contain higher than average

filtration (co-precipitation), is the best known technique. This technique ... especially for selective removal of arsenic from natural water. Studies on the ... molybdenum, selenium, antimony etc. Pal : Granular Ferric Hydroxide for Elimination of Arsenic from drinking Water 63

CuS has an active effect on the separation of arsenic due to the destruction of (Sb,As) 2 O 3 structures in the original dust and the simultaneous release of As in the form of As 4 O 6. At a roasting temperature of 400 °C and CuS addition amount of 130%, the volatilization rates of arsenic and antimony reach 97.80 wt.% and 8.29 wt.%, respectively.

A temperature-controlled selective filtration technology for synchronous removal of arsenic and recovery of antimony from the fume produced from reduction smelting process of lead anode slimes was proposed. The chromium (Cr) alloyed FeAl intermetallic with an asymmetric pore structure was developed …

DGT and selective extractions reveal differences in arsenic and antimony uptake by the white icicle radish (Raphanus sativus) Highlights•As was more labile than Sb, despite total soil As being lower than total soil Sb.•More As accumulated in radish tissues; more Sb translocated from roots to shoots.•Tissue As and Sb strongly correlated with their labile soil fractions.•Compared with ...

3 and 1.320 g of arsenic trioxide As 2O 3 in 100 mL of reagent water containing 4 g NaOH. Acidify the solution with 20 mL concentrated HNO 3 and dilute to 1 liter. 5.10.2 Intermediate antimony and arsenic solution: Pipet 1 mL stock antimony and arsenic solution into a 100-mL volumetric flask and

The detection limits of this method were 1.8 ng dm −3 for arsenic and 9.4 ng dm −3 for antimony in the case of 100‐cm 3 sample volumes. Therefore, it is suitable for determination of trace arsenic and antimony in natural waters.

What is claimed is: 1. A process for the selective removal of antimony and bismuth from an electrolyte solution containing at least 150 g/l H 2 SO 4, comprising adding to the electrolyte solution a salt of a cation selected from the group consisting of barium, strontium and lead to precipitate said cation from the solution as a poorly soluble sulfate, co-precipitating the bismuth and antimony.

Their precipitation from electrolyte solutions, in which the pH is below 0 has, however, proven difficult. The object of this invention is thus to provide a method for the selective removal of antimony and bismuth from electrolyte solutions, which contain very large amounts, 150 to 230 g/l, sulfuric acid.

The present work aimed to evaluate the selective leaching and precipitation processes of arsenic in oxide form, As 2 O 3, from the dust collected from ESP of a Pierce−Smith copper converter.

In gold smelting industry, coexisting of arsenic (As) and antimony (Sb) in gold-bearing sludge is a serious issue for the smelting process. This study employed a two-stage leaching methods to selective extract arsenic and antimony from gold-bearing sludge. Arsenic was firstly removed through NaOH leaching, following by Na2S-NaOH leaching to remove antimony in the atmospheric conditions.

Separation of arsenic and valuable metals (Pb, Zn, Cu, Bi, Sn, In, Ag, Sb, etc.) is a core problem for effective utilization of high arsenic-containing copper smelting ashes (HACSA). This study developed an effective separation process of arsenic, lead, and zinc from HACSA via alkali leaching followed by sulfide precipitation.

This study has investigated the selective immobilization of antimony using the brucite (magnesium hydroxide)-rich precipitate (BP) collected from a hypochlorous storage tank in a nuclear power plant of South Korea. The energy dispersive X-ray and X-ray diffraction analyses revealed that the BP mainly consisted of magnesium (72.5%) and its dominant mineral phase was brucite (Mg(OH)2).