CN112264195B

CN112264195B - Cassiterite mineral flotation inhibitor and application thereof

Info

Publication number: CN112264195B
Application number: CN202011293038.4A
Authority: CN
Inventors: 刘杰; 李艳军; 姜凯; 朱一民
Original assignee: Northeastern University China
Current assignee: Northeastern University China
Priority date: 2020-11-18
Filing date: 2020-11-18
Publication date: 2021-10-12
Anticipated expiration: 2040-11-18
Also published as: CN112264195A

Abstract

The invention discloses a cassiterite mineral flotation inhibitor and application thereof, wherein the inhibitor comprises sodium hexametaphosphate and hydroxycitric acid in a weight ratio of 1 (0.5-1), is applied to cassiterite mineral flotation, and comprises the following steps: adding water into an inhibitor to prepare an inhibitor solution; crushing, wet grinding and adding water to prepare ore pulp; adding the inhibitor solution into the ore pulp, adding the collecting agent, stirring and carrying out air flotation. Compared with the traditional method for floating the cassiterite, the method for floating the cassiterite through the inhibitor and the SPA as the collecting agent has the advantages that the grade of the tin concentrate is improved by about 15%, the content of fluorite, calcite and other gangue minerals in the concentrate is reduced by 30%, the entrainment rate of other gangue minerals is reduced by 20%, and the consumption of the inhibitor can be reduced by 30-50% compared with that of the inhibitor in the traditional method; the inhibitor has small influence on the floatability of other useful minerals in the cassiterite raw ore and has no pollution to the environment.

Description

Cassiterite mineral flotation inhibitor and application thereof

Technical Field

The invention belongs to the technical field of mineral flotation separation, and particularly relates to a cassiterite mineral flotation inhibitor and application thereof.

Background

In order to improve the grade of tin concentrate, in the beneficiation process, the floatability of easy-to-float gangue such as fluorite, calcite and the like is good, so that the easy-to-float gangue serving as impurities influences the flotation process of the tin concentrate and seriously influences the product index of the tin concentrate. The combined inhibitor can well inhibit the easy-to-float gangue minerals such as fluorite, calcite and the like, and plays an important role in improving the grade of tin concentrate. Therefore, the inhibitor is combined to inhibit easy-to-float gangue such as fluorite, calcite and the like in flotation, and has great significance for improving the recovery of cassiterite.

Disclosure of Invention

The invention aims to provide a cassiterite mineral flotation inhibitor and a using method thereof, aiming at the problems that the flotation of cassiterite minerals such as fluorite and calcite is seriously influenced because the floatability of the fluorite and calcite easy-to-float gangue minerals is better in the flotation process of the cassiterite minerals such as fluorite and calcite, so that the fluorite and calcite easy-to-float gangue minerals are inhibited, and the grade of tin concentrate is improved.

In order to solve the above technical problems, the present invention provides the following technical solutions.

One of the technical schemes of the invention is as follows: a cassiterite mineral flotation inhibitor comprises sodium hexametaphosphate and hydroxycitric acid in a weight ratio of 1 (0.5-1).

The second technical scheme of the invention is as follows: an application of the flotation inhibitor in cassiterite mineral flotation is provided.

Further, the method comprises the following steps:

(1) adding water into a cassiterite mineral flotation inhibitor to prepare an inhibitor solution;

(2) crushing, wet grinding and adding water to prepare ore pulp;

(3) flotation: adding the inhibitor solution obtained in the step (1) into the ore pulp obtained in the step (2), then adding a collecting agent, stirring, and performing air flotation.

Further, in the step (1), the concentration of the inhibitor solution is 15-25 wt%.

Further, the cassiterite raw ore in the step (2) is a fluorite and calcite-containing tin ore or an associated tin ore containing fluorite and calcite.

Further, in the step (2), the cassiterite raw ore is crushed to be less than 2mm, and is wet-ground until the size of-0.074 mm accounts for 75-85%.

Further, the pH value of the ore pulp in the step (2) is 7-9.

Further, the concentration of the ore pulp in the step (2) is 25-35 wt%.

Further, in the step (3), the collecting agent is styrene phosphonic acid.

Further, in the step (3), the adding amount of the inhibitor solution is 500-1000 g per ton of the cassiterite raw ore, and the adding amount of the collecting agent is 100-200 g per ton of the cassiterite raw ore.

Compared with the prior art, the invention has the following beneficial effects:

(1) the cassiterite mineral flotation inhibitor can react with the surfaces of the pumice minerals contained in the cassiterite minerals such as fluorite and calcite to make the cassiterite minerals hydrophilic, so that the floatability of the cassiterite minerals is reduced, the floatability difference between the cassiterite and the pumice minerals is increased, the cassiterite is effectively separated from the pumice minerals such as fluorite and calcite, and the grade of tin concentrate is improved.

(2) Compared with the traditional method for floating the cassiterite, the method for floating the cassiterite through the inhibitor and the SPA as the collecting agent improves the grade of the tin concentrate by about 15 percent, reduces the content of fluorite, calcite and other gangue minerals in the concentrate by 30 percent, and reduces the entrainment rate of other gangue minerals by 20 percent during comprehensive recovery.

(3) When the inhibitor disclosed by the invention is used for inhibiting fluorite, calcite and other pumice stone minerals in cassiterite minerals, the dosage of the inhibitor can be reduced by 30-50% compared with that of the inhibitor in the traditional method, and the beneficiation cost can be greatly reduced.

(4) Compared with the inhibitor adopted by the traditional cassiterite mineral flotation, the inhibitor provided by the invention can greatly improve the grade of tin concentrate, has small influence on floatability of other useful minerals, and has no pollution to the environment.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.

FIG. 1 is a process flow diagram of example 1;

FIG. 2 is a process flow diagram of example 2;

FIG. 3 is a process flow diagram of example 3.

Detailed Description

Reference will now be made in detail to various exemplary embodiments of the invention, the detailed description should not be construed as limiting the invention but as a more detailed description of certain aspects, features and embodiments of the invention. It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Further, for numerical ranges in this disclosure, it is understood that each intervening value, between the upper and lower limit of that range, is also specifically disclosed. Every smaller range between any stated value or intervening value in a stated range and any other stated or intervening value in a stated range is encompassed within the invention. The upper and lower limits of these smaller ranges may independently be included or excluded in the range.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Although only preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention. All documents mentioned in this specification are incorporated by reference herein for the purpose of disclosing and describing the methods and/or materials associated with the documents. In case of conflict with any incorporated document, the present specification will control.

It will be apparent to those skilled in the art that various modifications and variations can be made in the specific embodiments of the present disclosure without departing from the scope or spirit of the disclosure. Other embodiments will be apparent to those skilled in the art from consideration of the specification. The description and examples are intended to be illustrative only.

As used herein, the terms "comprising," "including," "having," "containing," and the like are open-ended terms that mean including, but not limited to.

In the following examples, raw cassiterite ore containing 0.45 wt% of tin, 10.19 wt% of fluorite, 9.78 wt% of calcite, 74.34 wt% of other gangue minerals (quartz, dolomite, chlorite, sericite, garnet, etc.) and 5.24 wt% of other useful minerals (sphalerite, galena, chalcopyrite, pyrite) was used.

Example 1

Carrying out flotation on cassiterite raw ores, and comprising the following steps:

(1) adding water into sodium hexametaphosphate and Hydroxycitric Acid (HAC) in a weight ratio of 1:1 to prepare an inhibitor solution with the weight percent of 20;

(2) crushing cassiterite raw ore to be less than 2mm, wet-grinding to-0.074 mm accounting for 85%, adding water to prepare ore pulp with the concentration of 25 wt%, and adjusting the pH of the ore pulp to be 7;

(3) flotation: adding the inhibitor solution obtained in the step (1) into the ore pulp obtained in the step (2), then adding a collecting agent Styrene Phosphonic Acid (SPA), uniformly stirring, and performing air flotation, wherein the adding amount of the inhibitor solution is 500g in each ton of cassiterite raw ore, and the adding amount of the SPA is 100g in each ton of cassiterite raw ore.

The process flow diagram of this example is shown in FIG. 1.

Example 2

(1) adding water into sodium hexametaphosphate and HAC in a weight ratio of 1:0.5 to prepare an inhibitor solution with the weight percent of 15 percent;

(2) crushing cassiterite raw ore to be less than 2mm, wet-grinding to-0.074 mm accounting for 85%, adding water to prepare ore pulp with the concentration of 30 wt%, and adjusting the pH of the ore pulp to be 9;

(3) flotation: adding the inhibitor solution obtained in the step (1) into the ore pulp obtained in the step (2), then adding a collecting agent SPA, uniformly stirring, and performing air flotation, wherein the adding amount of the inhibitor solution is 750g in each ton of the cassiterite raw ore, and the adding amount of the SPA is 150g in each ton of the cassiterite raw ore.

The process flow diagram of this example is shown in FIG. 2.

Example 3

(1) adding water into sodium hexametaphosphate and HAC in a weight ratio of 1:1 to prepare an inhibitor solution with the weight percent of 25 percent;

(2) crushing cassiterite raw ore to be less than 2mm, wet-grinding to-0.074 mm accounting for 75%, adding water to prepare ore pulp with the concentration of 35 wt%, and adjusting the pH of the ore pulp to be 8;

(3) flotation: adding the inhibitor solution obtained in the step (1) into the ore pulp obtained in the step (2), then adding a collecting agent SPA, uniformly stirring, and performing air flotation, wherein the adding amount of the inhibitor solution is 1000g in each ton of the cassiterite raw ore, and the adding amount of the SPA is 200g in each ton of the cassiterite raw ore.

The process flow diagram of this example is shown in FIG. 3.

Comparative example 1

(1) adding water into sodium hexametaphosphate to prepare a 20 wt% inhibitor solution;

(3) flotation: adding the inhibitor solution obtained in the step (1) into the ore pulp obtained in the step (2), then adding a collecting agent SPA, uniformly stirring, and performing air flotation, wherein the adding amount of the inhibitor solution is 500g in each ton of the cassiterite raw ore, and the adding amount of the SPA is 100g in each ton of the cassiterite raw ore.

Comparative example 2

(1) adding water into HAC to prepare a 20 wt% inhibitor solution;

Comparative example 3

(2) crushing cassiterite raw ore to be less than 2mm, wet-grinding to-0.074 mm accounting for 85%, adding water to prepare ore pulp with the concentration of 25 wt%, and adjusting the pH of the ore pulp to be 5;

Comparative example 4

(2) crushing cassiterite raw ore to be less than 2mm, wet-grinding to-0.074 mm accounting for 85%, adding water to prepare ore pulp with the concentration of 25 wt%, and adjusting the pH of the ore pulp to be 10;

Comparative example 5

(1) adding water into sodium hexametaphosphate and Hydroxycitric Acid (HAC) in a weight ratio of 1:1.5 to prepare an inhibitor solution with the weight percent of 20%;

The compositions of the concentrates obtained by flotation in examples 1 to 3 and comparative examples 1 to 5 are shown in Table 1:

TABLE 1

As can be seen from table 1, when the inhibitor of the present invention is used and SPA is used as a collector, and when cassiterite raw ore containing easy-to-float gangue minerals such as fluorite and calcite is subjected to flotation, the consumption of the inhibitor can be reduced by 30-50%, the grade of the obtained tin concentrate is high, compared with the existing traditional cassiterite flotation method, the grade of the tin concentrate can be improved by about 15%, the content of fluorite and calcite in the concentrate can be reduced by 30%, the entrainment rate of other gangue minerals is reduced by 20% during comprehensive recovery, and the content of other useful minerals is high.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.

Claims

1. The application of the cassiterite mineral flotation inhibitor in cassiterite mineral flotation is characterized in that the cassiterite mineral flotation inhibitor comprises sodium hexametaphosphate and hydroxycitric acid in a weight ratio of 1 (0.5-1);

the cassiterite mineral flotation inhibitor is adopted to carry out flotation on cassiterite minerals, and comprises the following steps:

(2) crushing, wet grinding and adding water to prepare ore pulp;

(3) flotation: adding the inhibitor solution obtained in the step (1) into the ore pulp obtained in the step (2), then adding a collecting agent, stirring, and performing air flotation;

in the step (1), the concentration of the inhibitor solution is 15-25 wt%;

in the step (3), the collecting agent is styrene phosphonic acid;

in the step (3), the adding amount of the inhibitor solution is 500-1000 g per ton of the crude cassiterite, and the adding amount of the collecting agent is 100-200 g per ton of the crude cassiterite.

2. Use of a cassiterite mineral flotation depressant according to claim 1 in cassiterite mineral flotation, wherein the cassiterite raw ore in step (2) is a fluorite, calcite-containing tin ore or a fluorite, calcite-containing associated tin ore.

3. The use of a cassiterite mineral flotation depressant according to claim 1 in cassiterite mineral flotation, wherein in step (2) cassiterite raw ore is crushed to below 2mm and wet-ground to-0.074 mm, which is 75-85%.

4. The use of a cassiterite mineral flotation depressant according to claim 1 in cassiterite mineral flotation, wherein the pH of the slurry in step (2) is 7 to 9.