CN112195340A

CN112195340A - Method for reducing suspended solids in copper leaching solution

Info

Publication number: CN112195340A
Application number: CN202011045065.XA
Authority: CN
Inventors: 叶志勇; 张兴勋; 谢洪珍; 康锦程; 谭希发; 丁文涛; 张日富
Original assignee: Musonoi Mining Co ltd; Xiamen Zijin Mining and Metallurgy Technology Co Ltd
Current assignee: Musonoi Mining Co ltd; Xiamen Zijin Mining and Metallurgy Technology Co Ltd
Priority date: 2020-09-28
Filing date: 2020-09-28
Publication date: 2021-01-08

Abstract

The invention discloses a method for reducing suspended solids in copper leaching solution, which comprises the following steps: s1, concentrating and thickening the copper leaching solution obtained by leaching to obtain supernatant generated by a thickener; s2, adding initial fine mud into the supernatant to obtain ore pulp with the mass concentration of 5% -8%; s3, adding a flocculating agent into the ore pulp; and S4, settling the ore pulp by using settling equipment to obtain a settling underflow and a settling supernatant. The method can effectively reduce the content of suspended solid in the solution from about 1500mg/L to less than 100mg/L, meet the index of the subsequent process requirement and reduce the generation of three phases of extraction.

Description

Method for reducing suspended solids in copper leaching solution

Technical Field

The invention relates to the technical field of solid-liquid separation and non-ferrous metal extraction, in particular to a method for reducing solid suspended matters in copper leaching solution.

Background

Solid suspensions refer to solid materials that are not dissolved in a liquid, including clay particles, inorganic precipitates, organic scales, corrosion products, and the like.

Before the leachate of the high-mud-content copper oxide ore subjected to stirring and acid leaching enters an extraction system, the content of solid suspended matters is generally higher, so that three phases of the extraction system are increased, and even the extraction system is broken down when the three phases are serious. At present, in the industry, a flocculating agent is generally added for flocculation and sedimentation, a thickener is used for thickening to realize liquid-solid separation, so that the content of solid suspended matters in a solution is lower than 1500mg/L, then, the supernatant is subjected to sand filtration or plate-frame fine filtration to reduce the content of the solid suspended matters to be lower than 100mg/L, and then, the supernatant enters an extraction system.

Sand filtration causes hardening easily in the use, and the washing needs consume a large amount of manpower and materials, influences production, and the frame essence is strained and then has easy cross filtration in earlier stage and later stage filter cloth is blocked up, solution throughput greatly reduced scheduling problem.

Therefore, a more efficient and concise method for reducing the suspended solids is needed to be developed for the supernatant of the thickener with the suspended solids content of about 1500 mg/L.

Disclosure of Invention

In view of the deficiencies of the prior art, the present invention is directed to a method for reducing copper leach liquor solids suspension.

In order to achieve the purpose, the invention adopts the following technical scheme:

a method for reducing copper leach liquor solids suspension comprising the steps of:

s1, concentrating and thickening the copper leaching solution obtained by leaching to obtain supernatant generated by a thickener; also comprises the following steps:

s2, adding initial fine mud into the supernatant to obtain ore pulp with the mass concentration of 5% -8%;

s3, adding a flocculating agent into the ore pulp;

and S4, settling the ore pulp by using settling equipment to obtain a settling underflow and a settling supernatant.

Further, the initial fine sludge is a concentrated underflow produced by a thickener after the copper leaching solution obtained by leaching is concentrated and concentrated in step S1.

Further, the mass concentration of the flocculating agent is 0.25-0.5 per mill, and the flocculating agent is used for every 1m³1.5-2.5g of flocculating agent is added into the ore pulp.

Further, the settling time is 30-180 min.

Further, the settled underflow is recycled as fine mud and periodically opened.

The invention has the beneficial effects that: the method can effectively reduce the content of suspended solid in the solution from about 1500mg/L to less than 100mg/L, meet the index of the subsequent process requirement and reduce the generation of three phases of extraction. Specifically, by using the method of the invention, the fine suspended solid in the solution is stably suspended in the solution and is not easy to settle due to the repulsive force, steric hindrance, static electricity and other acting forces, a certain amount of large-particle seed crystals (underflow generated by thickening or settling) and a proper amount of flocculating agent are introduced, so that the stable system in the solution can be destroyed, and the solid is suspended and bridged to form coarse particles to settle down through the flocculating agent.

Drawings

FIG. 1 is a schematic flow chart of the method of examples 1 to 3 of the present invention.

Detailed Description

The present invention will be further described with reference to the accompanying drawings, and it should be noted that the present embodiment is based on the technical solution, and the detailed implementation and the specific operation process are provided, but the protection scope of the present invention is not limited to the present embodiment.

Example 1

This example provides a method for reducing copper leachate solids suspension, as shown in fig. 1, by the following steps:

(1) in the embodiment, before treatment, the content of suspended solid in the copper leaching solution is 1500mg/L, and the temperature is 25 ℃; concentrating by a thickener to obtain a concentrated underflow and a concentrated supernatant; adding initial fine mud into the supernatant to obtain ore pulp with the mass concentration of 5%; the initial fine sludge is the dense underflow;

(2) according to 2g/m³Adding a flocculating agent with the mass concentration of 0.25 per mill into the ore pulp, stirring for 1 minute, then feeding the mixture into a thickener through a central pipeline, wherein the sedimentation time of the thickener is 30 minutes, and after sedimentation is carried out by the thickener, the content of suspended solid in the settled supernatant is 80mg/L, so that the requirement of subsequent extraction is met;

(3) after 24 hours of operation, after the bottom of the thickener in the step (2) begins to have the sedimentation underflow, the sedimentation underflow part can be directly returned to the step (1) as fine mud for recycling, the original thickener underflow is replaced, and the open-circuit part sedimentation underflow is started, so that the underflow of the thickener in the step (2) is kept in dynamic balance.

Example 2

(1) in the embodiment, before treatment, the content of suspended solid in the copper leaching solution is 926mg/L, and the temperature is 30 ℃; concentrating by a thickener to obtain a concentrated underflow and a concentrated supernatant; adding initial fine mud into the supernatant to obtain ore pulp with the mass concentration of 7%; the initial fine sludge is the dense underflow;

(2) at a ratio of 2.5g/m³Adding a flocculating agent with the mass concentration of 0.5 per mill into the ore pulp, stirring for 2 minutes, then feeding the mixture into a thickener through a central pipeline, wherein the sedimentation time of the thickener is 85 minutes, and after sedimentation is carried out by the thickener, the content of suspended solid in the settled supernatant is 75mg/L, so that the requirement of subsequent extraction is met;

Example 3

(1) in the embodiment, before treatment, the content of suspended solids in the copper leaching solution is 735mg/L, and the temperature is 60 ℃; concentrating by a thickener to obtain a concentrated underflow and a concentrated supernatant; adding initial fine mud into the supernatant to obtain ore pulp with the mass concentration of 8%; the initial fine sludge is the dense underflow;

(2) at a rate of 1.5g/m³Adding a flocculating agent with the mass concentration of 0.3 per mill into the ore pulp, stirring for 2 minutes, then feeding the mixture into a thickener through a central pipeline, wherein the sedimentation time of the thickener is 180 minutes, and after sedimentation is carried out by the thickener, the content of suspended solid in the settled supernatant is 84mg/L, so that the requirement of subsequent extraction is met;

Various corresponding changes and modifications can be made by those skilled in the art based on the above technical solutions and concepts, and all such changes and modifications should be included in the protection scope of the present invention.

Claims

1. A method for reducing copper leach liquor solids suspension comprising the steps of:

s1, concentrating and thickening the copper leaching solution obtained by leaching to obtain supernatant generated by a thickener; it is characterized by also comprising the following steps:

s3, adding a flocculating agent into the ore pulp;

2. The process for the reduction of copper leachate solids suspension according to claim 1, wherein the initial fine slime is a thickening underflow produced by a thickener after the copper leachate obtained from the leaching is concentrated and thickened in step S1.

3. A process according to claim 1, wherein the flocculating agent is present at a concentration of 0.25 to 0.5% o by mass per 1m³1.5-2.5g of flocculating agent is added into the ore pulp.

4. A process according to claim 1, wherein the settling time is from 30 to 180 minutes.

5. A process for reduction of copper leach liquor solids suspension according to claim 1 wherein the underflow sediment stream is recycled as fine sludge and periodically opened.