Technology for extracting ferrous sulfide from gold-bearing cyanide tailings

A technology for cyanide tailings and ferrous sulfide, which is used in solid waste removal, solid separation, flotation and other directions, can solve the problems of cyanide tailings polluting the environment, low recycling rate, etc., and achieves good cyanide removal effect. The effect of low operating cost and no environmental pollution

Inactive Publication Date: 2018-05-18
FUJIAN SHUANGQISHAN MINING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides an extraction process of ferrous sulfide used in disposable batteries in gold-containing cyanide tailings to overcome the problems of environmental pollution and low reuse rate of cyanide tailings

Method used

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  • Technology for extracting ferrous sulfide from gold-bearing cyanide tailings

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Experimental program
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Effect test

Embodiment approach 1

[0030] The extraction process of ferrous sulfide in gold-containing cyanide tailings comprises the following steps carried out in sequence:

[0031] 1), using autoclaved method to hydrolyze cyanide in cyanide tailings:

[0032] Before the cyanide tailings are press-filtered, impurities such as copper, lead, and zinc are removed during the cyanide gold extraction process. Press filter the cyanide tailings and install it with a bucket truck, then put the bucket truck into the autoclave, seal it and vacuumize it for 0.5 hours, then introduce steam, after the temperature rises to 170°C, start to hold the pressure for 4 hours , and then reduce the pressure to discharge steam water containing ammonia, and the tailings of secondary resources remain in the autoclave. Sodium dihydrogen phosphate and magnesium chloride are added to the obtained ammonia-containing steam water to make NH 4+ , Mg 2+ and PO 4 -3 The molar ratio is n(NH 4+ ): n (Mg2+ ): n(PO 4 -3 )=1 : 1.1 : 1; adjus...

Embodiment approach 2

[0038] The extraction process of ferrous sulfide in gold-containing cyanide tailings comprises the following steps:

[0039] 1), using autoclaved method to hydrolyze cyanide in cyanide tailings:

[0040] After the cyanide tailings are press-filtered, install them in a bucket truck, then put the bucket truck into the autoclave, seal it and vacuumize it for 0.5 hours, then put in steam, and after the temperature rises to 190°C, start to hold the pressure for 2 hours , and then reduce the pressure to discharge ammonia-containing steam water, and the remaining secondary resource cyanide tailings in the autoclave;

[0041] 2), Flotation secondary resource cyanide tailings:

[0042] Using butylamine black drug and butyl xanthate combined collector, through the process of one rough, one sweep and five fine, can obtain high-quality pyrite with a sulfur content of 52.87%, a gold content of 5.8g / t, and a purity of 99.19%. . Wherein the consumption of butylamine black medicine is 20 g...

Embodiment approach 3

[0044] The extraction process of ferrous sulfide in gold-containing cyanide tailings comprises the following steps:

[0045] 1), using autoclaved method to hydrolyze cyanide in cyanide tailings:

[0046] Press-filter the cyanidation tailings and install them with a truck, then put the truck into the autoclave, seal it and vacuumize it for 1 hour, then introduce steam, and after the temperature rises to 200°C, start to hold the pressure for 1.5 hours , and then reduce the pressure to discharge ammonia-containing steam water, and the remaining secondary resource cyanide tailings in the autoclave;

[0047] 2), Flotation secondary resource cyanide tailings:

[0048] Using butylamine black drug and butyl xanthate combined collector, through the process of one rough, one sweep and five fine, can obtain high-quality pyrite with a sulfur content of 52.87%, a gold content of 5.8g / t, and a purity of 99.19%. . Wherein the consumption of butylamine black medicine is 35 grams per ton, a...

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Abstract

The invention relates to a technology for extracting ferrous sulfide from gold-bearing cyanide tailings. The technology comprises the steps that firstly, cyanide in the gold-bearing cyanide tailings is hydrolyzed by an autoclaving process, obtained secondary tailings are ground till a material in the secondary tailings, of which the fineness reaches 400 meshes, accounts for 95-98% of the secondarytailings; then, slurry blending is carried out to allow a liquid-solid mass ratio to be (3-4):1; and beneficiation reagents, namely, 60-120 g/t sodium n-butylxanthate and 15-35 g/t ammonium dibutyl dithiophosphate are added, a system pH value is adjusted to be between 6 and 9, and after one time of roughing, one time of scavenging and five times of cleaning are carried out, high-grade pyrites with the sulfur content being 52.87%, the gold content being 5.8 g/t, and the purity reaching 99.19% is obtained. With the adoption of the technology, the gold-bearing cyanide tailings in a smelting plant are recycled, secondary utilization of resources and the high value purpose are realized, and the amount of discharged pollutants is reduced substantially.

Description

technical field [0001] The invention relates to an extraction process of ferrous sulfide, in particular to an extraction process of ferrous sulfide used for disposable batteries in gold-containing cyanide tailings. Background technique [0002] Pyrite is the most widely distributed sulfide mineral in the earth's crust, and its main component is FeS 2 It is a relatively potential battery material with the characteristics of large capacity (theoretical specific capacity is about 893.6mAh / g), environmental protection (Fe and S are non-toxic), and wide voltage platform. Li / FeS Prepared from Pyrite as Cathode Active Material 2 The working voltage platform of the battery is 1.5V, which matches common electrical appliances, and is one of the hot spots in the research field of 1.5V lithium batteries. However, during the discharge process of lithium batteries, the positive electrode material in the delithiated state is prone to side reactions with the organic electrolyte, which det...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03D1/00B09B3/00B09B5/00
CPCB03D1/00B09B3/00B09B5/00
Inventor 易正明
Owner FUJIAN SHUANGQISHAN MINING
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