Method of performing chloridizing roasting to synchronously reduce and recover gold and iron from gold concentrate cyanide tailings

A technology of cyanidation tailings and chlorination roasting is applied in the field of comprehensive utilization of resources, which can solve the problems of high cost, inability to handle, large heat consumption requirement, etc., and achieve the effects of improving grade and reducing energy consumption.

Active Publication Date: 2015-03-11
JIANGXI YIYUAN REGENERATION RESOURCE CO LTD
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AI Technical Summary

Problems solved by technology

The problem with this method is that it cannot handle the cyanidation leaching tailings of high-sulfur phosphorus gold concentrate in the form of fine particles. When the content of sulfur and phosphorus in the leaching residue is high, the content of sulfur and phosphorus in the recovered iron concentrate will exceed the standard, which will seriously affect Sales
When this method is used to treat cyanide tailings containing gold and iron, gold will enter the iron concentrate, resulting in low gold recovery and large gold loss.
[0006] ZL201210017933.2 discloses a method of using high-impurity sulfuric acid slag to produce iron pellets and enrich valuable metals. The high-impurity sulfuric acid slag is processed, and the valuable metals are recovered through medium-temperature reduction roasting and high-temperature chlorination roasting. This method has the disadvantages of using two-stage roasting, which requires large heat consumption, high cost, and complicated process.
[0007] To sum up, there are certain shortcomings in the prior art for the treatment of gold concentrate cyanidation tailings with high sulfur, phosphorus and low gold and iron. However, reverse flotation pre-enrichment, pelletizing, chlorination and roasting are used to simultaneously reduce desulfurization in depth. The method of recovering gold and iron in cyanide tailings has not been reported at present

Method used

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  • Method of performing chloridizing roasting to synchronously reduce and recover gold and iron from gold concentrate cyanide tailings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The main components of the cyanide tailings of a gold concentrate are: gold grade 3.48g / t, copper grade 0.04%, iron grade 22.36%, phosphorus grade 0.74%, sulfur grade 1.17%, silica content 36%. The main metal minerals are hematite, magnetite, pyrite, etc., and the main gangue minerals are quartz, feldspar, silicate, etc.

[0037] according to figure 1 The shown technological process carries out recovery gold, iron, and concrete steps are as follows:

[0038] (1) reverse flotation pre-enrichment

[0039] (a) Add water to the gold concentrate cyanide tailings to adjust the slurry to a mass concentration of 20%, and control the slurry temperature to 30°C.

[0040] (b) Add 600g / t of sodium hydroxide and stir for 2min; add 900g / t of modified starch and stir for 5min; add 400g / t of modified lime and stir for 4min; add 800g / t of sodium oleate and stir for 4min; Flotation roughing to obtain reverse flotation roughing concentrate and reverse flotation roughing tailings.

[0...

Embodiment 2

[0059] The chemical analysis results of cyanidation tailings of a gold concentrate are as follows: gold grade 4.26g / t, iron grade 24.10%, phosphorus grade 0.91%, sulfur grade 1.32%, silica content 32.85%. The results of process mineralogy show that the main metal minerals in tailings are hematite, magnetite and pyrite, etc., and the main gangue minerals are quartz, feldspar, silicate and so on.

[0060] according to figure 1 The shown technological process carries out recovery gold, iron, and concrete steps are as follows:

[0061] (1) reverse flotation pre-enrichment

[0062] (a) Add water to the gold concentrate cyanidation tailings to adjust the slurry to a mass concentration of 30%, and control the slurry temperature to 35°C.

[0063] (b) Add 800g / t of sodium hydroxide and stir for 3min; add 1200g / t of modified starch and stir for 7min; add 600g / t of modified lime and stir for 6min; add 1000g / t of sodium oleate and stir for 7min; Flotation roughing to obtain reverse flo...

Embodiment 3

[0082] A gold concentrate cyanide tailings was chemically analyzed, the results are as follows: gold grade 4.02g / t, iron grade 21.84%, lead grade 0.01%, zinc grade 0.05%, phosphorus grade 0.62%, sulfur grade 1.05%, The silicon content is 40.18%. The results of process mineralogy show that the main metal minerals in tailings are hematite, magnetite and pyrite, etc., and the main gangue minerals are quartz, silicate and feldspar.

[0083] according to figure 1 The shown technological process carries out recovery gold, iron, and concrete steps are as follows:

[0084] (1) reverse flotation pre-enrichment

[0085] (a) Add water to the gold concentrate cyanidation tailings to adjust the slurry to a mass concentration of 25%, and control the slurry temperature to 32°C.

[0086] (b) Add 700g / t of sodium hydroxide and stir for 3min; add 1000g / t of modified starch and stir for 6min; add 500g / t of modified lime and stir for 5min; add 950g / t of sodium oleate and stir for 5min; Flotat...

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Abstract

The invention provides a method of performing chloridizing roasting to synchronously reduce and recover gold and iron from gold concentrate cyanide tailings, and belongs to the technical field of comprehensive utilization of resources. The method comprises the following steps: performing reverse flotation desilicication preconcentration on the gold concentrate cyanide tailings which comprise 0.5-0.95% of phosphorus, 0.9-1.4% of sulfur, 20-25% of iron, and 3.0-4.5 g / t of gold, drying the obtained concentrate, then mixing the concentrate with a chlorinating agent, a reducing agent, a dephosphorization agent and a desulfurizing agent, pelletizing, performing high temperature chlorination to volatilize gold and synchronously performing deep reduction to remove sulfur and phosphorus, collecting the exhaust gas to recover gold, and then performing crushing, ore grinding, magnetic separation on the roasted pellets to recover iron. With application of the method, a gold product and a sponge iron product can be obtained, wherein the gold recovery rate of the gold product is 92-96%; in the sponge iron product, the iron grade is 90-92.5%, the sulfur content is less than 0.06%, the phosphorus content is less than 0.07%, and the iron recovery rate is 88-93%. Through the reverse flotation preconcentration, the method can reduce the energy consumption of the follow-up treatment process and realize recycling of the low-grade gold and iron in the gold concentrate cyanide tailings.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of resources, in particular to a method for synchronous reduction and recovery of gold and iron by chlorination and roasting of gold concentrate cyanidation tailings. Background technique [0002] As gold ore becomes more and more "poor", "miscellaneous" and "fine", more and more gold in the mined gold ore is wrapped by pyrite, arsenopyrite, limonite, etc., which is difficult to sort. At present, the flotation process is mainly used to process this type of gold ore, and the obtained gold concentrate is recovered by oxidation roasting-cyanidation leaching process. [0003] After the gold concentrate is oxidized and roasted-cyanided to extract gold, a large amount of gold concentrate cyanide tailings will be produced. The tailings will contain a part of gold that has not been leached by cyanide, and also contain a certain amount of iron. Generally, this part of the tailings is sto...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B1/08C22B11/00B03D1/00
Inventor 李正要林蜀勇王金虎王梦成
Owner JIANGXI YIYUAN REGENERATION RESOURCE CO LTD
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