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Method for strengthening treatment of low-sulfur quartz vein type gold ore through centrifugal gravity concentration

An enhanced treatment, quartz technology, applied in the direction of solid separation, etc., can solve the problems of increasing the amount of leaching agent used in leaching time, incomplete dissociation of gold minerals, and reducing production efficiency, so as to reduce the grinding particle size requirements, save leaching time, reduce taste effect

Pending Publication Date: 2021-04-09
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the conventional leaching process, there is a problem that the dissociation of gold minerals is not complete, and part of the wrapped gold is lost in the tailings due to incomplete leaching.
At the same time, the existence of coarse-grained gold in the ore will increase the leaching time and the amount of leaching chemicals, reducing production efficiency

Method used

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  • Method for strengthening treatment of low-sulfur quartz vein type gold ore through centrifugal gravity concentration

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The low-sulfur quartz vein-type gold mine used is a quartz vein-type gold mine in Shandong, with a gold grade of 8.6g / t, containing 0.6% S by mass percentage, SiO 2 64.5%, the main gangue minerals are quartz and sericite, and the main metal minerals are pyrite.

[0032] Process such as figure 1 shown;

[0033] Crush the low-sulfur quartz vein gold ore to a particle size of ≤16mm to make crushed ore; make the crushed ore into a primary slurry with a mass concentration of 70%, and then conduct a stage of grinding to make a finely ground pulp, which is a solid solid The part with a particle size of ≤74μm in the composition accounts for 40% of the total mass; the part with a particle size of ≤3mm is screened out of the ground pulp as fine ore slurry, and the rest is returned to the first stage of grinding;

[0034] The fine ore slurry is re-selected by intermittent discharge type Nelson concentrator, the gravity value of re-selection is 60G, the recoil water pressure is ...

Embodiment 2

[0048] The low-sulfur quartz vein-type gold mine used is a quartz vein-type gold mine in Gansu, with a gold grade of 2.2g / t. The gold in the ore mainly exists in the form of natural gold and silver-gold deposits, and the gold minerals are embedded in a wide range of particle sizes;

[0049] Method is with embodiment 1, and difference is:

[0050] (1) The crushed ore is made into a primary slurry with a mass concentration of 80%; in the solid component of the ground slurry, the part with a particle size ≤ 74 μm accounts for 60% of the total mass;

[0051] (2) The recoil hydraulic pressure of re-election is 5psi, and the ore discharge cycle is 40min; the yield of Nelson concentrate is 0.03%, the recovery rate of Au is 40%, and the gold grade of Nelson concentrate is 2700g / t;

[0052] (3) Nelson concentrate is made into a secondary slurry with a mass concentration of 30%; the gold recovery rate of shaker beneficiation is 35%, and the gold grade of shaker concentrate is 36600g / t; ...

Embodiment 3

[0057] Method is with embodiment 1, and difference is:

[0058] (1) The crushed ore is made into a primary pulp with a mass concentration of 75%; in the solid component of the ground pulp, the part with a particle size ≤ 74 μm accounts for 50% of the total mass;

[0059] (2) The recoil water pressure of re-election is 6psi, and the ore discharge cycle is 50min; the yield of Nelson concentrate is 0.01%, and the gold grade of Nelson concentrate is 6300g / t;

[0060] (3) Nelson concentrate is made into a secondary slurry with a mass concentration of 25%; the gold recovery rate of shaker beneficiation is 30%, and the gold grade of shaker concentrate is 82500g / t;

[0061] (4) Particle diameter ≤ 74 μm in the overflow solid component accounts for 80% of the total mass;

[0062] (5) Concentrate the overflow to make tertiary ore pulp with a mass concentration of 40%, add caustic soda to adjust the pH value to 11.5; the addition of the environmental protection gold extracting agent is ...

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Abstract

The invention discloses a method for strengthening treatment of low-sulfur quartz vein type gold ore through centrifugal gravity concentration. The method comprises the following steps that (1) the low-sulfur quartz vein type gold ore is crushed and then prepared into primary ore pulp to be subjected to primary ore grinding, and fine ore pulp is prepared; (2) an intermittent ore discharge type Nelson concentrating machine is adopted for gravity concentration, and Nelson concentrate is prepared into secondary ore pulp for table concentrator concentration; (3) Nelson tailings are graded to obtain overflow and settled sand; (4) secondary ore grinding is carried out on the settled sand, and then mixing and grading with the Nelson tailings are carried out; (5) overflow concentration is carried out to prepare tertiary ore pulp, the pH value is adjusted to be 11-12, stirring is carried out, a gold extracting agent is added, and leaching is carried out; leaching residues and leaching liquid are separated out; and (6) scavenging is carried out on the leaching residues by using a CVD type Nelson concentrating machine, and scavenged concentrates are mixed with settled sand to jointly carry out secondary ore grinding. According to the method disclosed by the invention, the dosage of a leaching agent and the leaching time are saved, the leaching efficiency is improved, the gold recovery rate is effectively ensured, the pressure of the leaching process is reduced, and the ore grinding requirement is reduced.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to a method for intensively treating low-sulfur quartz vein gold ore by means of centrifugal gravity separation. Background technique [0002] Because of its dual properties of metal and currency, gold is widely used in jewelry, electronics, communications, aerospace, reserves and investment. Low-sulfur quartz vein type gold deposit is an important industrial type of gold mine. It is characterized by low sulfur content in raw ore, uneven distribution of gold minerals, coarse and medium-grained gold and micro- and fine-grained gold. Minerals are quartz, muscovite and chlorite, etc. Metal minerals are less in content, mostly pyrite, chalcopyrite, galena, sphalerite and bismuthite, etc. Gold minerals are mostly wrapped gold and fractured gold And the form of intergranular gold exists in gangue minerals. [0003] Cyanide method is one of the most effective metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03B9/00B03B1/00
CPCB03B9/00B03B1/00
Inventor 杨洪英佟琳琳陈桥牛会群金哲男
Owner NORTHEASTERN UNIV
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