Golden shifting process of biological oxidation-torrefaction-cyanidation

A bio-oxidation and roasting technology, applied in the direction of improving process efficiency, can solve problems such as inability to effectively recover gold, and achieve the effect of improving leaching rate and reducing pollution

Active Publication Date: 2008-12-03

CHANGCHUN GOLD RES INST +1

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AI-Extracted Technical Summary

Problems solved by technology

[0003] The remarkable feature of micro-disseminated carbonaceous refractory gold ore is that gold exists in pyrite or arsenopyrite in the form of fine particles and pack...

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Abstract

The invention relates to a biologic oxidation-roasting-cyanide gold leaching process, which belongs to metallurgical technologies. The technology proposal combines the biologic oxidation technology and the low-temperature roasting technology; the biologic oxidation process is utilized to lead wrapped fine particle gold to be exposed and dissociated fully; then oxidation sludge is processed through low-temperature roasting to remove organic carbon in ores, thereby thoroughly solving the adsorption and preg-robbing problems in subsequent cyanidation operation, and preventing low melting point oxides from secondarily wrapping the gold; the organic combination of the two pretreatment processes provides advantages for the cyaniding leaching of the gold. The biologic oxidation-roasting-cyanide gold leaching process has the advantages that firstly, the leaching rate of the gold is increased to 95.82 percent compared with the conventional leaching rate that is 0.66 percent, so that the leaching rate of the gold is increased obviously; secondly, the environmental pollution is reduced greatly.

Application Domain

Process efficiency improvement

Technology Topic

Leaching ratePre treatment +8

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Examples

Experimental program(3)

Example Embodiment

[0091] Example 1:

[0092] (1) Grinding and grading operations:

[0093] Grind the above-mentioned refractory gold concentrate to a particle size of -0.045mm and a content of 95%, and then carry out dense drug removal and adjust the pulp concentration to 16%;

[0094] (2) Biological oxidation operation:

[0095]The ore pulp with a concentration of 16% in step (1) was fed into the biological oxidation system, and the pH was guaranteed to be 1 to 2; the temperature was 40° C.; the amount of dissolved oxygen was 4 mg/l; Under the same process conditions, the biological oxidation operation is carried out. After the oxidation washing liquid is subjected to primary neutralization and secondary neutralization to remove arsenic, solid-liquid separation is carried out, and the neutralized residue is discharged. The neutralized liquid is returned to the washing system, and the oxidized residue is recycled. After pressure filtration, drying and pulverization, enter the next step of roasting operation;

[0096] (3) Roasting operation:

[0097] The oxidized slag subjected to pressure filtration, drying and pulverization in step (2) is fed into the roasting furnace, the roasting temperature is kept at 500 ° C, and the constant temperature time is 60 min to carry out the roasting operation, and the roasted calcined sand enters step (4), and its flue gas is Discharge after reaching the standard after treatment;

[0098] (4) Cyanide gold extraction operation:

[0099] Cyanide carbon leaching: the calcined calcined in step (3) is quenched with water and then slurried to a concentration of 33%; the pH value of the pulp is 10.5; the alkali treatment time is 2h; the amount of NaCN is 8kg/t; the average bottom carbon density is 20kg/t m 3; The number of leaching stages is 7, and the leaching time is 84h; the gold-loaded carbon produced by the above process conditions is desorbed and electrolyzed—refined with gold mud to obtain the product gold ingot, the leaching residue is sent to the tailings pond for stockpiling, and the lean liquid is returned Pre-dipping pulp mixing system.

[0100] The technical indicators of the experimental results are:

[0101] Carbon removal rate: 96.53%

[0102] Sulfur volatilization rate: 9.29%

[0103] Arsenic curing rate: 95.07%

[0104] Gold leaching rate: 95.80%

Example Embodiment

[0105] Example 2:

[0106] (1) Grinding and grading operations:

[0107] Grind the above-mentioned refractory gold concentrate to a particle size of -0.045mm and a content of 95%, and then carry out dense drug removal and adjust the pulp concentration to 18%;

[0108] (2) Biological oxidation operation:

[0109] The ore pulp with the ore pulp concentration of 18% in step (1) is fed into the biological oxidation system, and the temperature is 38° C.; the dissolved oxygen is 4 mg/1; the medium consumption is 3 kg/t; Under the same process conditions, the biological oxidation operation is carried out. After the oxidation washing liquid is subjected to primary neutralization and secondary neutralization to remove arsenic, solid-liquid separation is carried out, and the neutralized residue is discharged. The neutralized liquid is returned to the washing system, and the oxidized residue is recycled. After pressure filtration, drying and pulverization, enter the next step of roasting operation;

[0110] (3) Roasting operation:

[0111] The oxidized slag subjected to pressure filtration, drying and pulverization in step (2) is fed into the roasting furnace, and the roasting temperature is kept at 480 ° C, and the constant temperature time is 60 min to carry out the roasting operation. Discharge after reaching the standard after treatment;

[0112] (4) Cyanide gold extraction operation:

[0113] Cyanide carbon leaching: the calcined calcined in step (3) is quenched with water and then slurried to a concentration of 30%; the pH value of the pulp is 10.5; the alkali treatment time is 4h; the amount of NaCN is 8kg/t; the average bottom carbon density is 20kg/t m 3; The number of leaching stages is 7, and the leaching time is 84h; the gold-loaded carbon produced by the above process conditions is desorbed and electrolyzed—refined with gold mud to obtain the product gold ingot, the leaching residue is sent to the tailings pond for stockpiling, and the lean liquid is returned Pre-dipping pulp mixing system.

[0114] The technical indicators of the experimental results are:

[0115] Carbon removal rate: 94.40%

[0116] Sulfur volatilization rate: 11.61%

[0117] Arsenic curing rate: 93.83%

[0118] Gold leaching rate: 93.96%

Example Embodiment

[0119] Example 3:

[0120] (1) Grinding and grading operations:

[0121] Grind the above-mentioned refractory gold concentrate to a particle size of -0.045mm and a content of 95%, and then carry out dense drug removal and adjust the pulp concentration to 16%;

[0122] (2) Biological oxidation operation:

[0123] The ore pulp with a concentration of 16% in step (1) was fed into the biological oxidation system, and the pH was guaranteed to be 1 to 2; the temperature was 42° C.; the amount of dissolved oxygen was 5 mg/l; Under the same process conditions, the biological oxidation operation is carried out. After the oxidation washing liquid is subjected to primary neutralization and secondary neutralization to remove arsenic, solid-liquid separation is carried out, and the neutralized residue is discharged. The neutralized liquid is returned to the washing system, and the oxidized residue is recycled. After pressure filtration, drying and pulverization, enter the next step of roasting operation;

[0124] (3) Roasting operation:

[0125] The oxide slag subjected to pressure filtration, drying and pulverization in step (2) is fed into the roasting furnace, and the roasting temperature is kept at 550 ° C, and the constant temperature time is 100 min to carry out the roasting operation, and the roasted calcined sand enters step (4), and its flue gas Discharge after reaching the standard after treatment;

[0126] (4) Cyanide gold extraction operation:

[0127] Cyanide - zinc powder replacement: the calcined calcined in step (3) is quenched with water and then slurried to a concentration of 35%; the pH value of the pulp is 11; the alkali treatment time is 8h; the amount of NaCN is 15kg/t; the leaching time is 40h; The precious liquid leached by the above process conditions is replaced by zinc powder to produce gold mud and refined into gold ingots; the leaching slag is sent to the tailings pond for stockpiling, and the lean liquid is returned to the pre-leaching slurry mixing system.

[0128] The technical indicators of the experimental results are:

[0129] Carbon removal rate: 96.87%

[0130] Sulfur volatilization rate: 9.58%

[0131] Arsenic curing rate: 93.55%

[0132] Gold leaching rate: 95.82%

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Description & Claims & Application Information

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the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine

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Classification and recommendation of technical efficacy words

Improve leaching rate
Reduce pollution

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Oxide Sludge Materials science Low melting point

Golden shifting process of biological oxidation-torrefaction-cyanidation

A bio-oxidation and roasting technology, applied in the direction of improving process efficiency, can solve problems such as inability to effectively recover gold, and achieve the effect of improving leaching rate and reducing pollution

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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