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Method for extracting carbonaceous matters in gold ores

A medium carbonaceous material and carbonaceous material technology, applied in solid separation, flotation and other directions, can solve the problems of high price, limited synthesis amount of sodium polytungstate, difficult to control the reaction process, etc., to improve the purity, shorten the time, Mitigating the effect of distractions

Inactive Publication Date: 2014-08-27
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sodium polytungstate is formed by the polymerization of sodium tungstate. Due to the very active chemical properties of sodium tungstate, the reaction process is difficult to control, so the synthesis of sodium polytungstate is limited and the price is expensive; and the reagent cannot be synthesized in China at present. Mainly rely on imports

Method used

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  • Method for extracting carbonaceous matters in gold ores
  • Method for extracting carbonaceous matters in gold ores
  • Method for extracting carbonaceous matters in gold ores

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The gold ore treated in this example comes from a gold mine in Sichuan. The contents of its main elements are shown in Table 1. The particle size analysis after grinding shows that gold ore samples with a particle size of ≤100 μm account for 80% of the total; The gold-loaded sulfides are pyrite, magnetite and arsenopyrite, and the main gangue minerals are quartz, magnesium calcite, dolomite and muscovite.

[0039] Table 1 Contents of main elements in the gold ore of Example 1

[0040]

[0041] A method for extracting carbonaceous matter in gold ore, comprising the following steps:

[0042] (1) Removal of carbonate minerals

[0043] Add 2mL of hydrochloric acid with a concentration of 12mol / L per gram of gold ore sample, mix the hydrochloric acid and the ore sample, stir at 55°C and 600rpm for 0.5 hours, and centrifuge at 1000rpm for 15 minutes to remove the acid solution;

[0044] Repeat above-mentioned steps 2 times, after adding hydrochloric acid, ore sample no lon...

Embodiment 2

[0056] The gold ore treated in this example comes from a gold mine in Shaanxi. The contents of its main elements are shown in Table 3. The particle size analysis after grinding shows that 88% of the gold mines have a particle size of ≤100 μm; the main gold-carrying sulfide in this gold mine is yellow Iron ore and arsenopyrite, the main gangue minerals are quartz, calcite, dolomite and muscovite.

[0057] The content of main elements in table 3 example 2 gold ore

[0058]

[0059] A method for extracting carbonaceous matter in gold ore, comprising the following steps:

[0060] (1) Removal of carbonate minerals

[0061] According to the ratio of adding 6mL hydrochloric acid with a concentration of 9mol / L per gram of mineral sample, add hydrochloric acid to the mineral sample; stir for 1 hour at 65°C and 800rpm, and centrifuge at 2000rpm for 5 minutes to remove the acid solution;

[0062] Repeat the above steps 3 times, and then add hydrochloric acid, the ore sample no longe...

Embodiment 3

[0092] The carbonaceous gold ore treated in this example comes from a gold mine in Guangxi. The content of its main elements is shown in Table 6. The particle size analysis after grinding shows that 85% of the gold ore has a particle size of ≤100 μm. The gold sulfide is mainly loaded in this gold ore. for pyrite,

[0093] Pyrrhotite and arsenopyrite, the main gangue minerals are quartz, dolomite and muscovite.

[0094] The content of main elements in table 6 example 3 gold ore

[0095]

[0096] A method for extracting carbonaceous matter in gold ore, comprising the following steps:

[0097] (1) Removal of carbonate minerals

[0098] Add 10 mL of hydrochloric acid with a concentration of 6 mol / L per gram of the ore sample, mix the hydrochloric acid and the ore sample; stir for 1.5 hours at 75°C and 1,000 rpm, then centrifuge at 1,500 rpm for 10 minutes to remove the acid solution;

[0099] Repeat the above steps 4 times, after adding hydrochloric acid, the ore sample no l...

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Abstract

Aiming at such disadvantages as long extracting period, severe acid harm, high cost and disturbance of the extraction of carbonaceous matters from precipitates which are formed in the easy reaction between residual carbonate minerals and hydrofluoric acid in a conventional method for extracting the carbonaceous matters in gold ores, the invention provides a method for extracting carbonaceous matters in gold ores; and the method belongs to the field of noble metal metallurgy. The method comprises the steps of: firstly, using hydrochloric acid to remove the carbonate minerals in the gold ores; then, using the hydrochloric acid and the hydrofluoric acid to remove silicate minerals in the gold ores; and finally, using a heavy-liquid flotation method for separation so as to obtain the carbonaceous matters in the gold ores. The method for extracting the carbonaceous matters, provided by the invention, reduces the cost of extracting the carbonaceous matters, shortens the time of extracting the carbonaceous matters, reduces the interference of extracting and separating the carbonaceous matters from the precipitates which are formed in the reaction between the gold ores and the hydrofluoric acid, can obtain the carbonaceous matters with high purity, and establishes the foundation for the in-depth study of the carbonaceous matters in the gold ores.

Description

technical field [0001] The invention belongs to the field of precious metal metallurgy, in particular to a method for extracting carbonaceous matter from gold mines. Background technique [0002] The carbonaceous matter in gold ore can rob the dissolved gold by adsorption during the process of cyanidation gold leaching, forming the so-called "gold robbery" phenomenon, resulting in low recovery rate of gold cyanide leaching. In addition to carbonates, carbonaceous substances in refractory gold ores mainly include elemental carbon, organic acids, and hydrocarbons. Elemental carbon may be graphite or amorphous carbon, and its adsorption behavior of gold cyanide is similar to that of activated carbon; more than half of the organic carbon is humic acid organic acid, which can form a stable gold cyanide chelate with gold through its own functional groups ; Hydrocarbons are mainly composed of long-chain alkanes. The study found that the carbonaceous substances that produce the ef...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/00B03D1/00
Inventor 杨洪英刘倩
Owner NORTHEASTERN UNIV
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