Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for extracting gold from iron oxide wrapped refractory tailings

An iron oxide-based, difficult-to-handle technology, which is applied in the field of gold extraction, can solve problems such as simple process, complex process, and poor effect, and achieve good economic and social benefits, easy industrialization, and pollution reduction.

Inactive Publication Date: 2017-03-15
唐志宇
View PDF15 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reduction method can obtain a better gold leaching effect, but the process is very complicated; the chlorination roasting method has strong adaptability and good comprehensive utilization effect, but the equipment investment and maintenance costs are high; the ironmaking-electrolysis method can enrich gold at the same time The production of pure iron saves energy consumption, but it has high requirements on ore grade and impurity content; the acid-dissolving method and alkali-melting method are simple, but the effect is very poor

Method used

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
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Iron oxide wrapped tailings contain Fe 34.33%, Au 13.35g / t, moisture content 24.51%, whichever is 300Kg (wet weight), according to the weight of tailings:pretreatment agent=0.8:1, add pretreatment agent That is sulfuric acid, add 0.3Kg catalyst sodium nitrate, heat the reaction to 500°C, and keep it warm for 2.5h; then mix it with water according to the solid-liquid ratio of 1:3 (mass:volume), stir and leaching at room temperature for 2h, and press it with a plate and frame after leaching Filter press to obtain filter residue and filtrate enriched with gold concentrate, wash the filter residue with water until neutral, and obtain neutral filter residue 150Kg (wet weight), water content 51.97%, Fe content 9.1%, gold 43.3g / t, gold Enriched by 3.24 times; the obtained neutral filter residue is adjusted into a pulp with a mass concentration of 25%, and No. 19 gold leaching agent is added according to 0.1% of the pulp mass, and then the auxiliary agent ammonium thiocyanate is...

Embodiment 2

[0032] Iron oxide wrapped tailings contain Fe 34.33%, Au 13.35g / t, moisture content 24.51%, whichever is 136 Kg (wet weight), according to the weight of tailings: pretreatment agent = 1:1, mixed into the pretreatment The agent is sodium sulfate, add 0.15Kg catalyst nitric acid, heat the reaction to 400°C, and keep it warm for 2.5h; The filter press was filtered to obtain the filter residue and filtrate rich in gold concentrate, and the filter residue was washed with water until neutral to obtain a neutral filter residue of 80.8Kg (wet weight), with a water content of 55.94%; containing Fe 9.0%, gold 43.3g / t, Gold enrichment is 3.24 times; the obtained neutral filter residue is adjusted into a pulp with a mass concentration of 35%, and 10 gold leaching agent is added according to 0.3% of the pulp mass, and then the auxiliary agent ammonium thiocyanate is added according to 0.2% of the pulp mass to control the pH value 11, blowing compressed air continuously, stirring and leachi...

Embodiment 3

[0036] Iron oxide wrapped tailings contain Fe 34.6%, Au 13.3g / t, water content 23.81%, whichever is 600Kg (wet weight), according to the weight of tailings: pretreatment agent = 1.2:1, add pretreatment agent sodium sulfate and sulfuric acid (the ratio of the two is 3:7), add 0.6Kg catalyst ammonium nitrate, heat the reaction to 400°C, keep warm for 2h; then add water according to the solid-liquid ratio of 1:5 (mass:volume), stir and leaching at room temperature After 4 hours of leaching, use a plate and frame filter press to obtain a filter residue rich in gold concentrate and filtrate, wash the filter residue with water until neutral, and obtain a neutral filter residue of 386Kg (wet weight), with a water content of 48.02% and an Fe content of 10.64% , gold 29.52g / t, gold enrichment 2.22 times; the obtained neutral filter residue is used to prepare a slurry with a mass concentration of 28%, adding No. Ammonium cyanate, control the pH value to 12, blow in compressed air contin...

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
Login to View More

PUM

No PUM Login to View More

Abstract

The present invention provides a method for extraction of gold from iron oxide-class wrapped difficult-to-treat tailing, the iron oxide-class wrapped difficult-to-treat tailing is added with a pretreatment agent and a catalyst, evenly mixed, and heated for reaction to 400-800 DEG C, and heat preservation is performed for 2-5 h so as to destroy the iron oxide-class wrapping of gold; the pretreated material is added with water, stirred, leached and press-filtered to obtain gold-concentrate-enriched filter residue and filtrate, the filter residue is washed with water to neutral; an ore pulp is prepared, and is added with a gold leaching agent and an auxiliary agent, pH is controlled at 10-12, compressed air is continuously blown in, the ore pulp is stirred and leached at 10-40 DEG C for 20-40 h, after stirring adsorption for 6-12 h, the ore pulp is sieved by a screen, and by desorption and recovery of gold carrying carbon on the screen by conventional method, the gold is obtained. The recovery rate of the gold in the tailing is 90-95%, the gold leaching-adsorption rate in the prior art is only 2-5%, the gold in the tailing is recovered, and the pollution of the tailing to the environment is reduced.

Description

technical field [0001] The invention relates to a method for extracting gold from extremely difficult-to-treat tailings wrapped in iron oxide, and belongs to the field of tailings and hazardous waste treatment. Background technique [0002] Iron oxide wrapped gold deposits mainly come from the oxidized calcine of refractory gold ores and a small amount of primary ore with wrapped gold. Gold in wrapped gold mines is often wrapped in metal sulfide, arsenopyrite, quartz gangue and other minerals in the form of fine particles and ultra-fine natural gold, and the particle size is generally less than 1 μm. Simply using mechanical grinding to 800-1000 mesh can also It is difficult to destroy the package and spinel structure, which not only increases the economic cost, but also makes the subsequent liquid-solid separation difficult if the ore is too fine. [0003] High-sulfur gold ore is a very common refractory gold ore. Gold leaching is hindered because some metal sulfides such a...

Claims

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
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C22B11/00
CPCY02P10/20
Inventor 唐志宇余建民吴虹瑾
Owner 唐志宇