Closed-circuit method for improving refractory gold ore concentrate quality and recovery rate

A gold concentrate and recovery rate technology, applied in flotation, solid separation, etc., can solve the problems of few industrial applications, limited sources, difficult treatment, etc., and achieve the effects of good selectivity, wide sources, high grade and recovery rate

Active Publication Date: 2007-09-05
厦门紫金矿冶技术有限公司
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Problems solved by technology

Lime is mainly used as an inhibitor of pyrite in gold ore, but it also has an inhibitory effect on gold minerals; water glass is mainly used as an inhibitor of silicate and other gangue minerals, but it has an inhibitory effect on carbonate minerals and aluminosilicate Salt minerals have poor inhibitory effects; cyanide is mainly used as a metal sulfide and pyrite inhibitor, but it also has a strong inhibitory effect on gold and can dissolve gold, causing gold to be lost to tailings, and its toxicity is also serious Environmental issues
In addition, there are organic substances used as inhibitors, but due to limited sources or expensive prices or unsatisfac

Method used

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  • Closed-circuit method for improving refractory gold ore concentrate quality and recovery rate

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Embodiment Construction

[0019] The present invention is described in further detail below in conjunction with accompanying drawing:

[0020] To realize this closed-circuit method for improving the grade and recovery rate of gold concentrate of refractory gold mines is to add sodium pyrophosphate respectively in a roughing and a beneficiation process, which specifically includes the following steps:

[0021] (1) Change the molecular formula to Na 4 P 2 o 7 10H 2 O powdery or granular sodium pyrophosphate and raw ore are dissolved in water at 0.1-0.3% by weight to form an aqueous solution of sodium pyrophosphate;

[0022] (2) primary roughing, the sodium pyrophosphate aqueous solution is added to the raw ore pulp and stirred evenly, and a primary roughing is carried out;

[0023] (3) primary concentration, the sodium pyrophosphate aqueous solution is added to the gold concentrate of primary roughing and the gold concentrate of primary roughing and secondary roughing and stir evenly, and carry out p...

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Abstract

A closed-loop method for the gold ore difficult to dress to increase the grade and recovery rate of gold ore concentrate includes such steps as dissolving sodium pyrophosphate (Na4P2O7.10H2O) in water to obtain solution, adding it to crude ore slurry while stirring to obtain the primary ore concentrate, adding said solution while stirring to obtain the primary fine ore concentrate, refining to obtain the final ore concentrate, and returning all failings back for further dressing.

Description

1. Technical field [0001] The invention relates to a closed-circuit method for improving the grade and recovery rate of gold concentrate in refractory gold mines. 2. Background technology [0002] As the world's gold production continues to increase year after year, there are fewer and fewer easy-to-separate ores in nature, and it has become an inevitable trend to extract gold from difficult-to-separate gold ores. [0003] The properties of refractory gold ores are very complex. First, gold is distributed in a variety of gold-bearing minerals in ultramicroscopic form; second, there are many kinds of gangue minerals, including silicate, aluminosilicate minerals, and carbonate minerals; Third, it contains clay minerals that are easy to muddy. These unfavorable factors seriously affect the beneficiation index. The usual practice is to use lime, water glass, sodium fluorosilicate, cyanide, etc. as inhibitors for flotation. Lime is mainly used as an inhibitor of pyrite in gold...

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Application Information

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IPC IPC(8): B03D1/00B03D1/002B03D101/06B03D103/04
Inventor 刘汉钊孙忠梅陈景河刘升明
Owner 厦门紫金矿冶技术有限公司
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