阅读说明：本技术 一种氧化铜矿浸出方法 (Copper oxide ore leaching method ) 是由 罗刚 苗梁 陈杜娟 李�浩 马应平 刘坤 杨俊龙 于 2020-04-28 设计创作，主要内容包括：本发明一种氧化铜矿浸出方法,将原矿破碎至-30mm,使用筒式分级机进行分级作业,+3mm粒级进行池浸；-3mm粒级进行搅拌浸出。本发明通过粒级分级处理的方法有效的解决了细粒级矿物板结的问题,大幅提高了浸出作业回收率。(The invention relates to a copper oxide ore leaching method, which comprises the steps of crushing raw ores to-30 mm, carrying out classification operation by using a barrel type classifier, and carrying out pond leaching in a grade of +3 mm; agitation leaching was carried out at a size fraction of-3 mm. The invention effectively solves the problem of hardening of fine-grained minerals by a method of grading and processing the grain size, and greatly improves the recovery rate of leaching operation.)

1. The copper oxide ore leaching method is characterized by comprising the following steps:

1, crushing raw ores to-30 mm, and grading by using a cylinder grader to obtain ores with a grade of +3mm and ores with a grade of-3 mm;

step 2, putting the ore with the size fraction of +3mm into a leaching tank, adding the ore into a mixed solution I of sulfuric acid, hydrochloric acid and nitric acid with the concentration of 50% pumped by water pumped by a water storage tank and a mixed solution I of sulfuric acid, hydrochloric acid and nitric acid pumped by an acid preparation tank, wherein the distance between the final liquid level and the upper edge of the leaching tank is 280-320mm, and when the concentration of the leached acid in the leaching tank is lower than 8%, adding the mixed solution I of sulfuric acid, hydrochloric acid and nitric acid with the concentration of 50% in the acid preparation tank for regulation so as to ensure that the concentration; after one leaching period is finished, conveying the immersion liquid to a sedimentation tank, adding clean water pumped by a water storage tank into the leaching tank for ore washing, pumping the ore washing water into the leaching tank after soaking for 2 days, shoveling and conveying the leaching residues to a waste rock storage yard, and conveying the immersion liquid to a replacement tank for replacement to produce sponge copper after the immersion liquid is precipitated by the sedimentation tank;

and 3, conveying the ore with the size fraction of-3 mm to a leaching stirring barrel, adding a mixed solution II of 50% sulfuric acid, hydrochloric acid and nitric acid pumped by a water storage tank and an acid preparation tank, when the leaching acid concentration of the leaching tank is lower than 18%, adding the mixed solution II of 50% sulfuric acid, hydrochloric acid and nitric acid of the acid preparation tank to adjust so as to ensure that the leaching acid concentration is 19-21%, conveying the immersion liquid to a sedimentation tank after one leaching period is finished, adding clear water pumped by the water storage tank to the stirring barrel to wash the ore, stirring and washing the ore for 1 time, pumping the washing water to the leaching tank, conveying the immersion slag to a tailing pond, and conveying the immersion liquid to a displacement tank to displace and produce the sponge copper after the immersion liquid is precipitated by the sedimentation tank.

2. The method for leaching copper oxide ore according to claim 1, characterized in that: the dosage of sulfuric acid in the mixed solution I in the step 2 is 100 kg/t.raw ore, the dosage of hydrochloric acid is 10 kg/t.raw ore, and the dosage of nitric acid is 5 kg/t.raw ore.

3. The method for leaching copper oxide ore according to claim 1, characterized in that: and in the step 2, the distance between the final liquid level and the upper edge of the leaching tank is 300 mm.

4. The method for leaching copper oxide ore according to claim 1, characterized in that: the leaching acid concentration is ensured to be 10% in the step 2.

5. The method for leaching copper oxide ore according to claim 1, characterized in that: the dosage of sulfuric acid in the mixed solution II in the step 3 is 200 kg/t.raw ore, the dosage of hydrochloric acid is 10 kg/t.raw ore, and the dosage of nitric acid is 10 kg/t.raw ore.

6. The method for leaching copper oxide ore according to claim 1, characterized in that: the leaching acid concentration is ensured to be 20% in the step 3.

Technical Field

The invention belongs to the technical field of mineral processing engineering, and particularly relates to a copper oxide ore leaching method.

Background

In copper ore resources in China, copper oxide ores mainly comprise sildendum, a small amount of copper blue, chalcopyrite, malachite and gangue mineral garnet, green cord stone, diopside, chlorite, calcite and the like, and are copper-poor oxidized ores. The structure and the structure of the ore are simple, and are common structural structures of dip-dyeing type ores with hydrothermal solution causes. The structure of the ore comprises a particle structure, a fine-particle structure, a non-uniform particle structure, a fine particle structure and a sheet structure. The ore structure includes a star-point dip-dyed structure, a sparse dip-dyed structure, a thready dip-dyed structure, and a thready pulse structure.

The valuable minerals that make up the copper ore are mainly peacock and secondly malachite. The sildenafil and malachite minerals have nonuniform embedded particle sizes in ores, some are even colloidal, have close embedded relationship with minerals such as gangue and limonite, and belong to refractory copper ores. Experiments show that if the copper oxide ore leaching operation is carried out by completely using a tank leaching method, the leaching cost is low, but the leaching rate of copper metal is also low, the average leaching rate is 58 percent, and the main reason is that minerals with the size less than 3mm are easy to harden, so that the acid liquor permeability is poor in the tank leaching process, and the bottom minerals do not achieve the expected leaching effect.

Disclosure of Invention

The invention aims to provide a copper oxide ore leaching method capable of greatly improving the recovery rate of leaching operation.

In order to achieve the purpose, the copper oxide ore leaching method is characterized by comprising the following steps:

1, crushing raw ores to-30 mm, and grading by using a cylinder grader to obtain ores with a grade of +3mm and ores with a grade of-3 mm;

step 2, putting the ore with the size fraction of +3mm into a leaching tank, adding the ore into a mixed solution I of sulfuric acid, hydrochloric acid and nitric acid with the concentration of 50% pumped by water pumped by a water storage tank and a mixed solution I of sulfuric acid, hydrochloric acid and nitric acid pumped by an acid preparation tank, wherein the distance between the final liquid level and the upper edge of the leaching tank is 280-320mm, and when the concentration of the leached acid in the leaching tank is lower than 8%, adding the mixed solution I of sulfuric acid, hydrochloric acid and nitric acid with the concentration of 50% in the acid preparation tank for regulation so as to ensure that the concentration; after one leaching period is finished, conveying the immersion liquid to a sedimentation tank, adding clean water pumped by a water storage tank into the leaching tank for ore washing, pumping the ore washing water into the leaching tank after soaking for 2 days, shoveling and conveying the leaching residues to a waste rock storage yard, and conveying the immersion liquid to a replacement tank for replacement to produce sponge copper after the immersion liquid is precipitated by the sedimentation tank;

and 3, conveying the ore with the size fraction of-3 mm to a leaching stirring barrel, adding a mixed solution II of 50% sulfuric acid, hydrochloric acid and nitric acid pumped by a water storage tank and an acid preparation tank, when the leaching acid concentration of the leaching tank is lower than 18%, adding the mixed solution II of 50% sulfuric acid, hydrochloric acid and nitric acid of the acid preparation tank to adjust so as to ensure that the leaching acid concentration is 19-21%, conveying the immersion liquid to a sedimentation tank after one leaching period is finished, adding clear water pumped by the water storage tank to the stirring barrel to wash the ore, stirring and washing the ore for 1 time, pumping the washing water to the leaching tank, conveying the immersion slag to a tailing pond, and conveying the immersion liquid to a displacement tank to displace and produce the sponge copper after the immersion liquid is precipitated by the sedimentation tank.

In the technical scheme of the copper oxide ore leaching method, the further preferable technical scheme is characterized in that:

1. the dosage of sulfuric acid in the mixed solution I in the step 2 is 100 kg/t.raw ore, the dosage of hydrochloric acid is 10 kg/t.raw ore, and the dosage of nitric acid is 5 kg/t.raw ore;

2. the distance between the final liquid level in the step 2 and the upper edge of the leaching pool is 300 mm;

3. ensuring that the concentration of leaching acid is 10% in the step 2;

4. the dosage of sulfuric acid in the mixed solution II in the step 3 is 200 kg/t.raw ore, the dosage of hydrochloric acid is 10 kg/t.raw ore, and the dosage of nitric acid is 10 kg/t.raw ore;

5. the leaching acid concentration is ensured to be 20% in the step 3.

Compared with the prior art, the method effectively solves the problem of hardening of fine-grained minerals by a grain-sized grading treatment method, and greatly improves the recovery rate of leaching operation.

Detailed Description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.