A process and apparatus for the removal of arsenic values from an ore concentrate includes the steps of leaching the concentrate with a solution which dissolves the arsenic, separating undissolved residue therefrom, acidifying the arsenic pregnant solution to precipitate arsenic and other mineral values as insoluble salts and treating the arsenic barren solution to regenerate sulfur and sodium ...
اقرأ أكثرArsenic and antimony do present a larger problem, by reacting with the cyanide and using up all of the excess oxygen, leaving little or no oxygen to effect the dissolution of gold. Carbonaceous gold ores can have the carbon adsorb the gold onto its surface, and as a …
اقرأ أكثرA method of extracting gold from arsenic gold ore concentrate, wherein increase the temperature of smelting chamber to 100-300° C. and then hold the temperature to remove the vapor and small quantity of dust in the arsenic gold ore concentrate; Under residual pressure≦50 Pa, increase the temperature of smelting chamber and crystallization chamber to 300-500° C. and then hold the ...
اقرأ أكثرUS2835569A US57917356A US2835569A US 2835569 A US2835569 A US 2835569A US 57917356 A US57917356 A US 57917356A US 2835569 A US2835569 A US 2835569A Authority US United States Prior art keywords gold slurry iron arsenic oxidation potential Prior art date Legal status (The legal status is an assumption and is not a legal conclusion.
اقرأ أكثرArsenopyrite is the primary ore of arsenic metal. The mineral contains approximately 46% arsenic by weight. Arsenic metal is used to produce a variety of alloys. It was historically used to harden lead in ammunition, but this use was nearly eliminated by the late 1900s. Arsenic trioxide (As 2 O 3) can be produced by smelting arsenopyrite ...
اقرأ أكثرAmong the ores that contain gold are iron and arsenic minerals like pyrite and arsenopyrite. Naturally, these minerals act like a sponge that absorbs and collects gold in trace amounts.
اقرأ أكثرThe bio-oxidation of arsenic-bearing gold ore from tianli gold mine was investigated by comparing the dissolution of the sample ore in four different media, in a mix bacterial medium, mix bacterial medium after centrifugation, acidic medium and in a pure sterile medium. The experimental results showed typical oxidation characteristics for the ...
اقرأ أكثرThe invention revolves about the features of (1) removing some arsenic from the roasted or calcined arsenical gold ore ahead of the cyanide treatment stage, and (2) removing additional arsenic after cyanidation prior to precipitation of gold and ahead of final thickening.
اقرأ أكثر4.4 the effect of copper cyanide on gold leaching from oxide and sulphide ores 110 4.5 summary 114 chapters preg-robbing phenomena in the cyanidation of gold ores 116 5.1 objectives of this chapter 116 5.2 background information 116 5.3 preg-robbing behaviour …
اقرأ أكثر'locked' in sulphide minerals. The majority of gold ores are classified refractory because the gold mineralogy is contained in sulphides. This type of gold is typically very fine gold or locked in solid solution within sulphide minerals pyrite and arsenopyrite (FeAsS). The arsenic bearing pyrite is
اقرأ أكثرGold extraction refers to the processes required to extract gold from its ores.This may require a combination of comminution, mineral processing, hydrometallurgical, and pyrometallurgical processes to be performed on the ore.. Gold mining from alluvium ores was once achieved by techniques associated with placer mining such as simple gold panning and sluicing, resulting in direct recovery of ...
اقرأ أكثرPatent US7498006 - Smelting arsenic gold ore concentrate and iron ... Mar 3, 2009 ... A method of extracting gold from arsenic gold ore concentrate, wherein increase the temperature of smelting chamber to 100-300° C. and then...
اقرأ أكثرMost arsenic is obtained not from an ore mineral of arsenic, but as a by-product in the treatment of gold, silver, copper, and other metal ores. Environmental laws require that arsenic be removed from ores, so that it does not enter the environment in effluent gases, fluids, or solids.
اقرأ أكثرCyanidation of gold ores containing copper, silver, lead, arsenic and antimony . × Close Log In. Log In with Facebook Log In with Google. Sign Up with Apple. or. Email: ... Gold Ore. By ibrahim alp. Improved gold and silver extraction from a refractory antimony …
اقرأ أكثرWhere gold is associated with arsenic, antimony, tellurium, and certain other minerals, it is often only partly soluble in cyanide solution. The difficulty is usually more of a physical than a chemical one but special methods of treatment may be required. Gold Leaching & Processing of Arsenic Ore Mispickel (Arsenopyrite: FeAsS).6
اقرأ أكثرGold recovery was proportional to arsenic extraction during the oxidative leach, with >90 pct Au extraction for arsenic extraction ≥ 89 pct. Silver extraction did not follow this trend and ranged from 47 to 62 pct. Cyanide consumption was 2.6 kg NaCN per metric ton of leach residue and 5.7 kg NaCN per metric ton for the untreated ore.
اقرأ أكثرOre concentrates are subjected to cyanide solutions at alkaline conditions (pH ≈ 9.5–10) for 16–48 h, and as a result, gold is extracted in the form of Au(CN) 2-complex. Arsenic from arsenopyrite also forms unstable soluble complexes and finally …
اقرأ أكثرproposed by Sill (13) in the late 1950's for treating arsenic sulfide ores and was used commercially for treating a cobalt-nickel arsenic ore (14). Alkaline pressure oxidation was also used to treat high-acid-consuming mercury gold ore (15). Alkaline pressure oxidation yields a residue
اقرأ أكثرArsenopyrite is the most common mineral containing arsenic. Found in veins in crystalline rocks, associated with ores of tin, silver, lead and with various sulfides, including pyrite, chalcopyrite, sphalerite, galena, etc. Sometimes it is auriferous and serves as a gold ore. Identification and Diagnostics
اقرأ أكثرArsenic minerals commonly occurring in Carlin-type gold deposits include orpiment and realgar and, more rarely, native arsenic and arsenopyrite. Other arsenic-bearing phases present include arsenian pyrite and stibnite and a number of thallium and mercury sulfides. Under conditions of constant temperature and pressure, the relative stability of arsenic minerals is a function of sulfur activity.
اقرأ أكثرArsenic-containing non-fired process ores and concentrates in recovering gold from refractory bacterial leaching. At present, foreign countries by underground leaching and heap leaching from lean ore, ore and waste rock outside the balance sheet beneficiation plant tailings and mining enterprises in the leaching of copper and uranium, has been successfully using bacterial leaching method.
اقرأ أكثرArsenic sources to the biosphere associated with gold mining include waste soil and rocks, residual water from ore concentrations, roasting of some types of gold-containing ores to remove sulfur and sulfur oxides, and bacterially enhanced leaching. Arsenic concentrations near gold mining operations …
اقرأ أكثرAbstract Arsenic (As) is a major pollutant in many mine tailings resulting from base metal and gold deposits. It can potentially cause environmental risks because of its high toxicity at low concentrations. A new tailings' management technique has become popular in new mines, the cemented paste backfill (CPB). It consists of mixing tailings with water (typically 25%) and a low proportion of ...
اقرأ أكثرThe sources of arsenic and the various process options for treating arsenical gold ores and concentrates are briefly reviewed. The problem relating to the removal of arsenic from gaseous emissions from roasting processes is considered
اقرأ أكثر12%Under these conditions, several roasting campaigns with high-arsenic-containing ores were conducted, which resulted in a significant decrease in gold recovery. The reduced gold recovery was caused by the loss of surface area (e.g., porosity) of the calcine as the arsenic content of the roaster feed increased.
اقرأ أكثرArsenic is not fully investigated in Zhong et al. (2015), but given their similar geochemical behavior (Deditius et al., 2014) and common presence of both elements in gold deposits (Xing et al., 2019), it is possible that both As and Au would enter ore-forming fluid during breakdown of pyrite to pyrrhotite (Kusebauch et al., 2019).
اقرأ أكثرThis arsenic-driven gold pump explains how these iron sulphides can massively capture and then release gold, thus controlling ore deposit formation and distribution," lead researcher, Gleb ...
اقرأ أكثرAs an example, when the alkaline sulfide hydrometallurgical system is applied to a common arsenic containing material like enargite, Cu 3 AsS 4, which usually contains considerable gold, a ...
اقرأ أكثرSimilarly, Chang et al., evaluated bacterial interaction with arsenic from arsenic-contaminated gold-silver mines in the Republic of Korea and discovered 15 isolates that were able to oxidize and reduce two different species of arsenic As(V) and As(III).
اقرأ أكثرGold ores often contain considerable amounts of arsenic, so after gold extraction, the tailings typically have a higher arsenic content than the …
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