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Flotation pretreatment method for pyrite in cyanogen-containing and sulfur-containing tailings

A pyrite and pretreatment technology, applied in the direction of solid separation, etc., can solve the problems of reducing the decyanation flotation effect of cyanidation tailings, increasing the oxidant, and the large amount of chemicals, so as to avoid large consumption, corrosion, and treatment low cost effect

Pending Publication Date: 2021-06-29
山东金创金银冶炼有限公司
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Problems solved by technology

Among them, when various oxidation methods are used in the treatment of gold concentrate tailings, there is a problem of large dosage of chemicals. The main reason is that the current cyanidation production is the recycling of barren liquid, and a large amount of reducing substances have accumulated, such as sulfur ions, thiocyanate ions, etc. , and the gold concentrate tailings have a high sulfur content, and a large amount of ferrous ions are produced during acidification, which leads to an increase in the consumption of oxidants and reduces the effect of decyanation flotation of cyanidation tailings

Method used

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  • Flotation pretreatment method for pyrite in cyanogen-containing and sulfur-containing tailings

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Embodiment 1

[0041] refer to figure 1 A method for flotation pretreatment of pyrite in cyanide-containing and sulfur-containing tailings, comprising the following steps:

[0042] After S1 cyanide tailings are press-filtered, they are washed in the filter press with low-cyanide water to reduce the cyanide content of the tailings;

[0043] S2 further reduces the cyanide content of the filter cake in step S1 by slurry flotation, reduces the lead and zinc content in the tailings, press-filters the tailings, and washes them in the filter press with low-cyanide water; the solids after washing The total cyanide content is less than 1g / kg, and the easy-release cyanide content is less than 0.5g / kg; the pH of slurry washing and filter washing are both greater than 9.5; the water used for flotation and washing water needs to be replaced and regenerated regularly;

[0044] S3 Slurry the filter cake in step S2 with sulfur flotation circulating water, adjust the pH value to below 5 with sulfuric acid, ...

Embodiment 2

[0048] The cyanide-containing tailings are adjusted to a concentration of about 40%, the pH is adjusted to 9-11, and the flotation lead-zinc and concentrate tailings are filtered separately to reduce the lead-zinc content of the sulfur flotation concentrate and initially reduce harmful impurities in the tailings content.

[0049] Then the tailings filter cake is washed with water with low total cyanide content, the pH of the washing water is greater than 9, and the pH is further reduced by washing. When the pH is above 9 during washing, the effect of dissolving impurities is better.

[0050] Finally, the filter cake is adjusted to a slurry, so that the stirring is even and does not sit on the bottom. Add sulfuric acid to adjust the pH to about 3, and stir for 0.5 hours to stabilize the pH at about 3. Then add alkali to adjust the pH to 5-8, and add water to a concentration of 40%. ~50%, the obtained pulp is the treated pulp, which is flotation with butyl xanthate. According t...

Embodiment 3

[0052] The total cyanide content of cyanidation tailings is 1.7g / Kg to 2.0g / Kg, and the sulfur content is about 28%. After slurry adjustment, it enters the lead-zinc flotation process. After production, the total cyanide content of the flotation circulating water increases, and the total cyanide is controlled below 3000 mg / L by decyanation treatment of part of the circulating water.

[0053] The lead-zinc flotation tailings are dehydrated with a filter press, and the filter cake is backwashed with treated low-cyanide washing water. The pH of the washing is above 10, and the weight ratio of the washing water to the filter cake is about 1. At this time, the water content of the filter cake is about 15%. The cyanide content is about 0.6g / Kg.

[0054] The lead-zinc flotation tailings filter cake is slurried with sulfur flotation water. After sizing, the concentration is about 50%, the total cyanide is about 90mg / L, and the pH is about 5. It enters the sulfur flotation process and ...

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Abstract

The invention relates to a flotation pretreatment method for pyrite in cyanogen-containing and sulfur-containing tailings. Cyanide influencing sulfur flotation is separated from minerals through a washing method, and the effect of flotation of the pyrite in cyanogen-containing tailings is improved; and meanwhile, lead-zinc bulk flotation operation can be conducted in combination with the lead-zinc content condition of the tailings, and lead and zinc in the cyanogen-containing tailings are recycled. Flotation is conducted after pretreatment, when the sulfur grade of the cyanide-containing tailings is 20% or above, the sulfur grade of concentrate can be stabilized to be 45% or above, the sulfur grade of the tailings can reach 3% or below, the cyanide content of the flotation tailings is lower than 1000 mg / Kg, and the total toxic leaching cyanide content is lower than 5 mg / L. The flotation pretreatment method has the advantages that the consumption of an oxidizing agent is reduced, and the decyanation flotation effect of the cyanidation tailings is improved.

Description

technical field [0001] The application relates to the field of flotation pretreatment, in particular to a method for flotation pretreatment of pyrite in tailings containing cyanide and sulfur. Background technique [0002] Pyrite, also known as pyrite, is an important raw material for sulfuric acid production. At present, about 85% of gold is produced by cyanidation method, and more than 20 million tons of cyanide tailings are produced annually. Because cyanide tailings contain cyanide, they are hazardous wastes, and the post-processing pressure of tailings is high. Recovery of pyrite by flotation and other methods can reduce the content of cyanide and reduce the amount of tailings generated, thereby greatly reducing the pressure of tailings disposal. [0003] Existing publication number is that the Chinese patent of CN107617507B discloses a kind of technology that recovers gold, sulfur from gold concentrate biooxidation cyanide tailings, gold concentrate biooxidation cyani...

Claims

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Application Information

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IPC IPC(8): B03B1/00B03B1/04
CPCB03B1/00B03B1/04
Inventor 王文强符金武赵义峰王金超伊山廷包允
Owner 山东金创金银冶炼有限公司
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