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A pre-enrichment method for low-grade gold-bearing sulfide tailings gold

A low-grade, pre-enrichment technology, applied in chemical instruments and methods, wet separation, solid separation, etc., can solve the problem of difficulty in increasing gold cyanation rate, increasing cyanide consumption, and complex optimization of gold cyanation process, etc. problems, to achieve the effect of improving grade, simple process flow and beneficial to leaching and smelting

Active Publication Date: 2020-04-03
郑州中科新兴产业技术研究院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At the same time, the presence of metal sulfide minerals complicates the optimization of the gold cyanide process, making it difficult to increase the gold cyanide rate and increase the consumption of cyanide.

Method used

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  • A pre-enrichment method for low-grade gold-bearing sulfide tailings gold

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A method for pre-enrichment of low-grade gold-bearing sulfide tailings gold, the steps are as follows:

[0025] Low-grade gold-bearing sulfide tailings are selected, containing 24.77% of sulfur, 5.27% of arsenic, and 2.16g / t of gold. The raw materials are ground to a particle size of less than 0.074mm accounting for 95.09%. Mixed flotation roughing H 2 SO 4 4000g / t, isobutyl potassium xanthate 200g / t, nigrosine 0g / t and 2 # 20g / t oil, 100g / t isobutyl potassium xanthate, 2 # Oil 20g / t.

[0026] Separation and flotation selection I, CaO 300g / t, adjust the pH value of the slurry to 8.1, inhibitor NH 4 Cl 500g / t, NaHSO 3 500g / t. Featured II, inhibitor NH 4 Cl 200g / t, NaHSO 3 200g / t.

[0027] China Mines re-select NH 4 Cl 100g / t, NaHSO 3 100g / t, isobutyl potassium xanthate 40g / t, 2 # The oil is 30g / t, and the concentration of flotation slurry is 50%. Gravity selection uses a fine-grain shaker with a stroke of 14mm, a stroke of 420n / min, and a flushing water volume of about 0.6...

Embodiment 2

[0029] A method for pre-enrichment of low-grade gold-bearing sulfide tailings gold, the steps are as follows:

[0030] Low-grade gold-bearing sulfide tailings are selected, containing 24.77% sulfur, 5.27% arsenic, and 2.16g / t gold. The raw materials are ground to -0.074mm, accounting for 97.26%. Mixed flotation roughing H 2 SO 4 1000g / t, isobutyl potassium xanthate 150g / t, nigrosine 20g / t and 2 # 40g / t oil, 100g / t isobutyl potassium xanthate, 2 # Oil 25g / t.

[0031] Separation and flotation selection I, CaO 400g / t, adjusting the pH value of the pulp 8.6, inhibitor NH 4 Cl 400g / t, NaHSO 3 600g / t. Featured II, inhibitor NH 4 Cl 400g / t, NaHSO 3 300g / t.

[0032] China Mines re-select NH 4 Cl 150g / t, NaHSO 3 200g / t, isobutyl potassium xanthate 20g / t, 2 # The oil is 25g / t, and the concentration of flotation slurry is 30%. Gravity selection adopts slon-400 horizontal centrifugal concentrator, rotating speed 600rpm, rinsing water volume 6.35L / min, rinsing time 20s. Finally, a gold conc...

Embodiment 3

[0034] A method for pre-enrichment of low-grade gold-bearing sulfide tailings gold, the steps are as follows:

[0035] Low-grade gold-bearing sulfide tailings are selected, containing 24.77% sulfur, 5.27% arsenic, and 2.16g / t gold. The raw materials are ground to -0.074mm, accounting for 96.25%. Mixed flotation roughing H 2 SO 4 3000g / t, isobutyl potassium xanthate 180g / t, nigrosine 40g / t and 2 # 40g / t oil, 100g / t isobutyl potassium xanthate, 2 # Oil 30g / t.

[0036] Separation and flotation selection I, CaO 200g / t, adjust the pH value of the pulp 7.8, inhibitor NH 4 Cl 600g / t, NaHSO 3 400g / t. Featured II, inhibitor NH 4 Cl 300g / t, NaHSO 3 400g / t.

[0037] China Mines re-select NH 4 Cl 200g / t, NaHSO 3 300g / t, isobutyl potassium xanthate 60g / t, 2 # The oil is 20g / t, and the concentration of flotation slurry is 25%. The gravity separation adopts slon-400 horizontal centrifugal concentrator, rotating speed 500rpm, rinsing water volume 5.18L / min, rinsing time 30s. Finally, a gold co...

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Abstract

The invention relates to a pre-enrichment method of low-grade gold-contained vulcanized tailing gold. The pre-enrichment method comprises the following steps: (1) raw ores are grinded for mixing, flotation and tailing discarding to obtain mixed concentrates; (2) inhibitors are added in the mixed concentrates for inhibiting separation and flotation of arsenic pyrites to obtain gold-contained arsenic ores; and (3) the gold-contained arsenic ores are reselected by adopting a flotation-reselection combined process to obtain gold arsenic concentrates, so that gold achieves a pre-enriching effect, and the subsequent gold extraction is facilitated. Used raw materials are nonferrous metal mine vulcanized tailings; and the method is stable in treatment effect and simple in process flow.

Description

Technical field [0001] The invention relates to the field of mineral processing, in particular to a method for pre-enriching low-grade gold-bearing sulfide tailing gold. Background technique [0002] With the rapid economic development, the discharge and accumulation of tailings in our country are also increasing with the development of the mining industry. The main components of gold-bearing sulfide tailings are pyrite and arsenopyrite. Long-term accumulation and oxidation will produce sulfuric acid, which is harmful to the ecological environment and is also a waste of gold resources. [0003] my country's gold processing plants mostly use the cyanide method to extract gold. Generally, the formation of arsenic-sulfur-containing refractory gold ore is closely related to sulfide minerals such as pyrite, arsenopyrite, pyrrhotite, and chalcopyrite. , Arsenopyrite, pyrrhotite, etc.) decomposed with reducing substances and cyanide-consuming metals (copper, lead, zinc, iron, etc.) will a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B03B7/00
CPCB03B7/00
Inventor 赵俊利李永利郭强朱顺伟田登超付明波李会林李申
Owner 郑州中科新兴产业技术研究院