阅读说明：本技术 一种毒砂载金微细粒浸染型金矿石综合回收方法 (Comprehensive recovery method of toxic sand gold-loaded micro-fine particle immersion type gold ore ) 是由 张太雄 徐祥彬 王怀 郝福来 于 2019-11-19 设计创作，主要内容包括：本发明属于金矿石选矿技术领域,具体涉及一种毒砂载金微细粒浸染型金矿石综合回收方法；该方法包括：采用重选-闪浮-氰化联合流程,即原矿经过磨矿后进行重选,重选后进行闪速浮选,闪速浮选的尾矿进行浸出；重选设置于磨矿分级回路,可以实现边磨边选提早回收金；闪速浮选的引入,将富集的难处理毒砂包裹金进行集中处理,具有流程短、占地小、药剂用量少,无需新建独立浮选厂房、成本低、环保的特点；闪浮尾矿进行高碱下充气预处理后氰化浸出,可进一步降低尾矿金品位,实现矿石抛尾,是一种药剂用量少、金回收率高、高效节能、环保无污染的高效回收毒砂载金微细粒浸染型金矿石的选矿方法。(The invention belongs to the technical field of gold ore dressing, and particularly relates to a comprehensive recovery method of a toxic sand gold-loaded micro-fine particle dip-dyeing type gold ore; the method comprises the following steps: adopting a combined flow of gravity separation, flash flotation and cyanidation, namely, grinding the raw ore, then performing gravity separation, performing flash flotation after gravity separation, and leaching the tailings subjected to flash flotation; the gravity concentration is arranged in the ore grinding grading loop, so that the gold can be recycled in advance by grinding and selecting the edges; the introduction of flash flotation, which is used for centralized treatment of gold wrapped by the enriched hard-to-treat arsenopyrite, has the characteristics of short flow, small occupied area, small medicament consumption, no need of newly-built independent flotation plants, low cost and environmental protection; the flash tailings are subjected to high-alkali inflation pretreatment and then subjected to cyaniding leaching, so that the gold grade of the tailings can be further reduced, and the tailing discarding of the ores is realized.)

1. A comprehensive recovery method of a toxic sand gold-loaded micro-fine particle disseminated gold ore is characterized by comprising the following steps:

step one, carrying out gravity separation on raw ores after grinding to obtain gravity concentrate and gravity tailings;

step two, reselecting tailings to perform flash flotation to obtain flash concentrate and flash tailings;

leaching the obtained flash tailings by a CIL carbon leaching method to obtain gold-loaded carbon and leaching residues, and discarding the leaching residues;

grinding the obtained flash flotation concentrate, then carrying out pretreatment to improve the bare degree of gold, and carrying out cyaniding leaching on the pretreated flash flotation concentrate by using a CIL carbon leaching method to obtain gold-loaded carbon and leaching residue;

and step four, desorbing, electrolyzing and smelting all the obtained gold-loaded carbon to obtain gold ingots.

2. The method of claim 1, wherein the pretreatment of the flash flotation concentrate in step three includes but is not limited to biological oxidation and roasting pretreatment.

3. The comprehensive recovery method of the arsenopyrite gold-loaded micro-fine particle disseminated gold ore according to claim 2, characterized in that before leaching, the flash tailings and the pretreated flash concentrate in the third step need to be concentrated and dehydrated, the mass concentration of the ore pulp is controlled to be 40%, then lime and an auxiliary leaching agent are added for aeration stirring pretreatment, wherein the pH value of the pretreated ore pulp is maintained at 10.5-11.5, and finally cyanide leaching is performed according to a CIL carbon leaching method after sodium cyanide or an environment-friendly gold leaching agent and activated carbon are added.

Technical Field

The invention belongs to the technical field of gold ore dressing, and particularly relates to a comprehensive recovery method of a toxic sand gold-loaded micro-fine particle dip-dyeing type gold ore.

Background

The flotation process is adopted to recover the gold ore which takes the arsenopyrite as the main gold-carrying mineral, and the gold in the raw ore is embedded in the gangue in the form of micro-fine particles, so that the gold grade of the flotation tailings is high, and the recovery rate of the flotation gold concentrate is not ideal; because partial gold in the raw ore is in the form of micro-fine particles embedded in arsenopyrite and is difficult to dissociate and expose, the leaching rate of gold leached by cyanidation is low; the traditional fine grinding has a limit to improve the gold dissociation degree, so that metal loss is caused, and the resource utilization rate is reduced. Therefore, the development of an efficient and reasonable comprehensive recovery method of the arsenopyrite gold-loaded micro-fine particle immersion type gold ore is of great significance.

Disclosure of Invention

In order to overcome the problems, the invention provides a comprehensive recovery method of the toxic sand gold-loaded micro-fine particle immersion type gold ore, which has the advantages of high gold recovery rate, simple process, environmental protection and high efficiency.

A comprehensive recovery method of a toxic sand gold-loaded micro-fine particle immersion type gold ore,

step one, carrying out gravity separation on raw ores after grinding to obtain gravity concentrate and gravity tailings;

step two, reselecting tailings to perform flash flotation to obtain flash concentrate and flash tailings;

leaching the obtained flash tailings by a CIL carbon leaching method to obtain gold-loaded carbon and leaching residues, and discarding the leaching residues;

grinding the obtained flash flotation concentrate, then pretreating to improve the bare degree of gold, and cyaniding and leaching the pretreated flash flotation concentrate by a CIL carbon leaching method to obtain gold-loaded carbon and leaching residues;

and step four, desorbing, electrolyzing and smelting all the obtained gold-loaded carbon to obtain gold ingots.

And in the third step, the pre-treatment of the flash flotation concentrate includes but is not limited to biological oxidation and roasting.

And in the third step, before leaching, concentrating and dehydrating the flash tailings and the pretreated flash concentrate, controlling the mass concentration of ore pulp to be 40%, adding lime and an auxiliary leaching agent for aeration stirring pretreatment, keeping the pH value of the ore pulp at 10.5-11.5, and finally adding sodium cyanide or an environment-friendly gold leaching agent and activated carbon for cyaniding leaching according to a CIL carbon leaching method.

The invention has the beneficial effects that:

the invention relates to a comprehensive recovery method of a arsenopyrite gold-loaded micro-fine particle leaching type gold ore, which realizes the development and utilization of the arsenopyrite gold-loaded micro-fine particle leaching type gold ore by a low-carbon and environment-friendly method, and obtains indexes of simple flow and high gold recovery rate. The method is reselected and arranged in an ore grinding grading loop, so that the gold can be recovered in advance while grinding and selecting; the introduction of flash flotation, which is used for centralized treatment of gold wrapped by the enriched hard-to-treat arsenopyrite, has the characteristics of short flow, small occupied area, small medicament consumption, no need of newly-built independent flotation plants, low cost and environmental protection; the flash tailings are subjected to air inflation pretreatment under high alkali (pH is more than or equal to 10.5) and then subjected to cyaniding leaching, so that the gold grade of the tailings can be further reduced, and tailings can be discarded. The ore dressing method for efficiently recovering the gold-loaded superfine particle leached gold ore of the arsenopyrite has the advantages of small medicament dosage, high efficiency, energy conservation, high gold recovery rate, environmental protection and no pollution.

Drawings

FIG. 1 is a process flow diagram of the present invention.

Detailed Description

As shown in figure 1, a comprehensive recovery method of a toxic sand gold-loaded micro-fine particle immersion type gold ore,

step one, carrying out gravity separation on raw ores after grinding to obtain gravity concentrate and gravity tailings;

step two, reselecting tailings to perform flash flotation to obtain flash concentrate and flash tailings;

step three, leaching the flash tailings obtained after the treatment of the step two by using a CIL carbon leaching method to obtain gold-loaded carbon and leaching residues, and discarding the tail of the leaching residues;

grinding the obtained flash flotation concentrate after the treatment in the second step, and then carrying out pretreatment to improve the bare degree of gold, and carrying out cyaniding leaching on the pretreated flash flotation concentrate by adopting an independent CIL carbon leaching method to obtain gold-loaded carbon and leaching residues;

and step four, desorbing, electrolyzing and smelting all the gold-loaded carbon obtained after the treatment of the step three to obtain gold ingots.

In the first step, the reselection is positioned in a grinding classification loop, and the granularity of the ore subjected to reselection is determined by the properties of the ore, and the reselection comprises but is not limited to two reselections.

The flash flotation is carried out in a grinding classification loop or after grinding classification, and one-stage or two-stage flash flotation is carried out. The flash flotation ore fineness is selected according to the monomer dissociation degree of different fineness under the ore property.

And in the flash flotation process in the second step, after the flotation regulator, the activating agent, the collecting agent and the foaming agent are added, the mixture is fully stirred and mineralized, then air flotation is carried out, and the flash flotation time is determined according to the gold grade of flash flotation concentrate.

And in the third step, the pretreatment of the flash flotation concentrate comprises but is not limited to biological oxidation and roasting pretreatment. Because partial gold in the raw ore is in the form of micro-fine particles embedded in arsenopyrite and is difficult to dissociate and expose, the leaching rate of gold leached by cyanidation is low; while the traditional fine grinding has limited improvement on the gold dissociation degree, causes metal loss and reduces the resource utilization rate, and the biological oxidation and roasting for ores such as arsenopyrite and pyrite coated gold are recognized by the industry as a process method for effectively improving the bare gold.

Before leaching, the flash tailings and the pretreated flash concentrate in the third step are subjected to the following operations, and then are subjected to cyaniding leaching by adding sodium cyanide or an environment-friendly gold leaching agent and activated carbon according to a CIL carbon leaching method, wherein the lime usage is adjusted according to the pH value of ore pulp, and the grinding fineness and the leaching time are adjusted according to the gold grade of leaching residue;

before leaching, the flash flotation tailings and the pretreated flash flotation concentrate in the third step need to be operated as follows:

concentrating and dehydrating, controlling the mass concentration of the ore pulp to be 40%, adding lime and an auxiliary leaching agent to carry out high-alkali aeration stirring pretreatment, wherein the pH value of the ore pulp after the pretreatment is maintained at 10.5-11.5;

the environment-friendly gold leaching agent comprises, but is not limited to, thiourea, cicada or CG 505.

The grinding of the flash flotation concentrate obtained after the treatment in the second step in the third step is fine grinding, and the grinding with the granularity of less than 0.074mm and the mass percentage content of more than 90 percent is usually called fine grinding, and sometimes the grinding with the granularity of less than 0.038mm and the mass percentage content of more than 80 percent. The fine grinding and the coarse grinding are relative concepts, the coarse grinding is easy to achieve, and the fine grinding needs to consume more energy and cost, so the flash concentrate enriched by flotation is adopted in the patent, the quantity of the flash concentrate is 1-5% of the original quantity, and the fine grinding of the flash concentrate greatly saves energy consumption and cost.

The gravity separation equipment in step one includes, but is not limited to, a nielsen concentrator, a shaker, a concentrating cyclone, and a spiral chute.

The principle of the invention is as follows:

the comprehensive recovery method of the arsenopyrite gold-loaded micro-fine particle disseminated gold ore is a combined flow of gravity separation, flash flotation and cyanidation. Carrying out gravity separation on raw ores after grinding, carrying out flash flotation after gravity separation, and leaching tailings subjected to flash flotation; reselecting and setting the gold particles in a grinding grading loop, and recycling the granular monomer gold generated in the grinding process in advance; flash flotation is carried out on the gravity tailings, so that the arsenopyrite-coated gold can be efficiently enriched and recovered; the flash flotation concentrate is pretreated by adopting the processes of biological oxidation or roasting and the like, and the pretreatment can open arsenopyrite to wrap gold, thereby being beneficial to leaching of the subsequent gold; lime and an auxiliary leaching agent are added into flash tailings and flash concentrate for aeration pretreatment under high alkali (pH is more than or equal to 10.5), sufficient dissolved oxygen is contained in high alkali ore pulp to facilitate the oxidation of sulfides, the soluble sulfides are oxidized into thiosulfate and finally into sulfate, and the soluble sulfides are further oxidized into thiocyanate due to the existence of cyanide in return water, so that the influence of oxygen-consuming and cyanogen-consuming active minerals on subsequent leaching operation is weakened in the treatment process of aeration pretreatment, and the influence of a passivation film generated on the surface of gold particles on the leaching rate is effectively prevented; the leaching residue after leaching the flash tailings can be thrown off the tailings in advance, the enriched flash concentrate is subjected to fine grinding and then is subjected to pretreatment, sulfide packages such as arsenopyrite and the like can be opened in the pretreatment, the leaching rate is improved, and the total gold recovery rate is higher than 90%; the introduction of flash flotation can be used for carrying out centralized treatment on gold wrapped by the enriched hard-to-treat arsenopyrite, and the method has the characteristics of short flow, small occupied area, small medicament consumption, no need of newly-built independent flotation plants, low cost and environmental protection, and is a comprehensive recovery method for efficiently recovering gold-loaded superfine particle immersion gold ore of arsenopyrite.

The method is suitable for the arsenopyrite gold-loaded micro-fine particle dip-dyeing type gold ore under the following conditions:

wherein the mass percentage of the arsenopyrite in the arsenopyrite gold-loaded micro-fine particle dip-dyed gold ore is more than 0.8 percent; the granularity of the gold containing granular gold ore is less than 0.01mm and more than 70%, and the granularity of the gold containing granular gold ore is more than 5% when the granularity is more than 0.053 mm; the gold mineral content closely related to arsenopyrite is more than 50%, wherein the content of arsenopyrite-coated gold is more than 20%. For example, 1.02% of arsenopyrite, 6.33% of gold with the granularity of more than 0.053mm, 82.64% of gold with the granularity of less than 0.01mm and 58.75% of gold mineral closely related to arsenopyrite are contained, wherein the arsenopyrite wraps the gold and contains 26.77%.