阅读说明：本技术 一种硫化铅锌矿浮选分离的组合抑制剂及应用 (Combined inhibitor for flotation separation of lead-zinc sulfide ore and application thereof ) 是由 罗进 蒋合国 李广利 刘瑞增 覃勇胜 谢立志 黄道军 孟德暑 张友银 钟少杰 高 于 2021-08-11 设计创作，主要内容包括：本发明公开了一种硫化铅锌矿浮选分离的组合抑制剂及应用,所述组合抑制剂包括硫酸锌和亚氨基二琥珀酸；组合抑制剂作为闪锌矿的抑制剂用于方铅矿和闪锌矿的浮选分离；将原矿进行磨矿并调浆,得到待浮选的矿浆,向矿浆中依次加入组合抑制剂、生石灰、捕收剂、起泡剂进行铅浮选作业,得到铅精矿和铅选尾矿,向铅选尾矿中依次加入活化剂、捕收剂和起泡剂进行锌浮选作业,得到锌精矿和尾矿,本发明的组合抑制剂对闪锌矿的抑制作用较强,有效实现了方铅矿与闪锌矿的浮选分离,该组合抑制剂可自然降解,对环境友好,且亚氨基二琥珀酸的加入可以降低硫酸锌的用量,从而降低选矿成本。(The invention discloses a combined inhibitor for flotation separation of lead-zinc sulfide ores and application thereof, wherein the combined inhibitor comprises zinc sulfate and iminodisuccinic acid; the combined inhibitor is used as an inhibitor of the sphalerite for flotation separation of galena and sphalerite; the method comprises the steps of grinding and pulp mixing raw ores to obtain ore pulp to be floated, sequentially adding a combined inhibitor, quicklime, a collecting agent and a foaming agent into the ore pulp to perform lead flotation operation to obtain lead concentrate and lead tailings, and sequentially adding an activating agent, the collecting agent and the foaming agent into the lead tailings to perform zinc flotation operation to obtain zinc concentrate and tailings.)

1. A combined depressant for flotation separation of lead-zinc sulfide ores, wherein the combined depressant comprises zinc sulfate and iminodisuccinic acid.

2. The combined depressant for lead zinc sulfide ore flotation separation of claim 1, wherein: the combined inhibitor is used as an inhibitor of sphalerite for flotation separation of galena and sphalerite.

3. The combined depressant for lead zinc sulfide ore flotation separation of claim 1, wherein: the mass ratio of the zinc sulfate to the iminodisuccinic acid is 1: 1-4: 1.

4. The application of the combined inhibitor for the flotation separation of lead-zinc sulfide ores as claimed in claims 1 to 3 is characterized by comprising the following specific steps:

grinding raw ore, and mixing to obtain ore pulp to be floated;

adding quicklime, zinc sulfate as a combined inhibitor, iminodisuccinic acid, a collecting agent and a foaming agent into the ore pulp in sequence to perform lead flotation operation to obtain lead concentrate and lead tailings;

and sequentially adding an activating agent, a collecting agent and a foaming agent into the lead tailings for zinc flotation operation to obtain zinc concentrate and tailings.

5. The use of the combined depressant for lead zinc sulfide ore flotation separation according to claim 4, wherein: the amount of the quicklime added in the step (2) is 2500-5000 g/t.

6. The use of the combined depressant for lead zinc sulfide ore flotation separation according to claim 4, wherein: the lead flotation operation in the step (2) comprises primary roughing, tertiary concentration and twice scavenging, and the zinc flotation operation in the step (3) comprises primary roughing, twice concentration and twice scavenging.

7. The use of the combined depressant for lead zinc sulfide ore flotation separation according to claim 4, wherein: in the step (2), the collecting agent is ethionine, and the foaming agent is 2# oil, wherein the total dosage of ethionine is 60-80 g/t, and the total dosage of 2# oil is 30-40 g/t; in the step (3), the activating agent is copper sulfate, the collecting agent is butyl xanthate, and the foaming agent is 2# oil, wherein the total dosage of the copper sulfate is 150-.

8. The use of the combined depressant for lead zinc sulfide ore flotation separation according to claim 4, wherein: the total dosage of the combined inhibitor added in the step (2) is 1000-2000 g/t.

Technical Field

The invention belongs to the technical field of beneficiation of lead-zinc sulfide ores, relates to a combined inhibitor for flotation separation of lead-zinc sulfide ores and application thereof, and particularly relates to application of zinc sulfate and iminodisuccinic acid serving as zinc blende inhibitors in the flotation separation process of lead-zinc sulfide ores.

Background

Lead and zinc are important non-ferrous metals that occupy a significant position in the development of national economy. At present, the extraction of lead metal and zinc metal mainly comes from lead-zinc sulfide ore, galena and sphalerite which are main carrier minerals of lead and zinc metal. However, lead and zinc have common mineralization reasons and similar electronic structures, have the same hydrophilic and hydrophobic properties to a great extent, and lead and zinc are close to each other and difficult to completely dissociate, so that lead and zinc are difficult to separate. Besides, the crystal lattice defects of the minerals and the influence of inevitable ions in the ore pulp are also main reasons of difficulty in separating lead and zinc. Therefore, a specific regulator needs to be added in the flotation process of lead-zinc sulfide ores, so that the flotability of lead sulfide ores and the difference of zinc blende are increased, and separation is further generated. In the flotation process, the inhibitor and the collector have the same important significance, and have an important effect on realizing the effective separation of minerals.

In the current zinc sulfide mineral flotation, zinc sulfate is the most commonly used inhibitor, sodium sulfide, sodium sulfite, sodium carbonate and sodium thioglycolate are also commonly used inhibitors, and the agents are used in combination with zinc sulfate and are also commonly used inorganic combination agents. However, the above drug systems generally have the disadvantages of large dosage of drug, high cost, etc. The organic inhibitor is just a supplement to the deficiency of the inorganic combined inhibitor, has the characteristics of wide source, low price, small dosage, strong inhibiting effect and easy degradation, and becomes a hotspot for the development of beneficiation reagents. The exploration of the zinc sulfide ore organic inhibitor with good selectivity has great significance for improving the lead-zinc separation reagent system, improving the lead-zinc separation concentrate indexes, reducing the dosage of traditional reagents such as zinc sulfate and the like, reducing the beneficiation cost and protecting the environment.

Disclosure of Invention

Aiming at the defects in the prior art, one of the purposes of the invention is to provide a combined inhibitor for flotation separation of lead-zinc sulfide ore, the combined inhibitor comprises zinc sulfate and iminodisuccinic acid, and the combined inhibitor has strong inhibiting effect on zinc blende, can be naturally degraded and is environment-friendly.

The combined inhibitor is used as an inhibitor of sphalerite for flotation separation of galena and sphalerite, wherein the mass ratio of zinc sulfate to iminodisuccinic acid is 1: 1-4: 1.

The invention also aims to provide an application of the combined inhibitor in the flotation separation of lead-zinc sulfide ores, which comprises the following specific steps:

(1) grinding raw ore, and mixing to obtain ore pulp to be floated;

(2) adding quicklime, zinc sulfate and iminodisuccinic acid serving as combined inhibitors, a collecting agent and a foaming agent into the ore pulp to perform lead flotation operation to obtain lead concentrate and lead tailings;

(3) and sequentially adding an activating agent, a collecting agent and a foaming agent into the lead tailings for zinc flotation operation to obtain zinc concentrate and tailings.

The amount of the quicklime added in the step (2) is 2500-5000 g/t.

The lead flotation operation in the step (2) comprises primary roughing, tertiary concentration and twice scavenging, and the zinc flotation operation in the step (3) comprises primary roughing, twice concentration and twice scavenging.

In the step (2), the collecting agent is ethionine, and the foaming agent is 2# oil, wherein the total dosage of ethionine is 60-80 g/t, and the total dosage of 2# oil is 30-40 g/t; in the step (3), the activating agent is copper sulfate, the collecting agent is butyl xanthate, and the foaming agent is 2# oil, wherein the total dosage of the copper sulfate is 150-.

The total dosage of the combined inhibitor added in the step (2) is 1000-2000 g/t.

The invention is characterized in that: the combined inhibitor comprises zinc sulfate and iminodisuccinic acid, and the invention mainly utilizes the synergistic inhibition effect of the zinc sulfate and the iminodisuccinic acid. Zinc sulfate is used as a traditional zinc blende inhibitor, and the action mechanism of the zinc sulfate is that the zinc sulfate is hydrolyzed in an alkaline ore pulp environment to generate zinc hydroxide colloid which is adsorbed on the surface of minerals, so that the hydrophilicity of the surface of the zinc blende is enhanced, and the zinc blende is inhibited. The amino disuccinic acid has nitrogen-containing group and carboxyl group in its molecular structure, has strong chelating ability with metal ion, can quickly generate water-soluble complex with inevitable ion in ore pulp, and can also complex with zinc ion on the surface of zinc blende, and simultaneously expose hydrophilic group carboxyl group in aqueous solution to make the surface of mineral hydrophilic, so that the zinc blende is inhibited.

Compared with the traditional single inhibitor zinc sulfate in the prior art, the invention has the following beneficial effects:

(1) the combined inhibitor for flotation separation of lead-sulfur sulfide ores and the application thereof provided by the invention realize efficient separation of galena and sphalerite, and have higher theoretical value and economic value for improving the flotation level and comprehensive resource utilization rate of complex lead-zinc-sulfur sulfide ores in China.

(2) The combined inhibitor adopted by the method has stronger selective inhibition effect on the sphalerite, and can effectively realize the flotation separation of galena and sphalerite.

(3) The zinc sulfate and the iminodisuccinic acid have the excellent characteristics of good water solubility, biodegradability and no toxicity, and the addition of the iminodisuccinic acid can greatly reduce the dosage of the zinc sulfate, thereby reducing the beneficiation cost.

Drawings

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

The specific implementation mode is as follows:

the present invention will be further described with reference to the following examples.

Example 1: the research of a flotation separation test is carried out on certain lead-zinc sulfide ore in Yunnan, and the main useful minerals of the raw ore containing 2.24 percent of Pb, 1.78 percent of Zn and 1.56 percent of Fe are galena and sphalerite. The gangue has low mineral content, mainly comprising calcite, dolomite and the like.

The combined inhibitor is used for flotation separation, and comprises zinc sulfate and iminodisuccinic acid, wherein the mass ratio of the zinc sulfate to the iminodisuccinic acid is 4: 1. As shown in fig. 1, the specific operation is as follows:

(1) grinding raw ore to-0.074 mm accounting for 70%, and mixing to obtain ore pulp to be floated;

(2) sequentially adding quicklime serving as an inhibitor of pyrite, a combined inhibitor zinc sulfate and iminodisuccinic acid serving as inhibitors of sphalerite into the ore pulp, and then adding a collecting agent ethiozine and foaming agent No. 2 oil to perform lead flotation operation of primary roughing, tertiary concentration and secondary scavenging to obtain lead concentrate and lead tailings; wherein the total dosage of the quicklime, the combined inhibitor zinc sulfate, the iminodisuccinic acid, the ethion nitrogen and the No. 2 oil is 2500 g/t, 1000 g/t, 60g/t and 30 g/t respectively.

(3) And sequentially adding an activating agent copper sulfate, a collecting agent butyl xanthate and foaming agent No. 2 oil into the lead tailings to perform primary roughing, secondary concentration and secondary scavenging zinc flotation operation, wherein the total dosage of the copper sulfate is 250g/t, the total dosage of the butyl xanthate is 100 g/t and the total dosage of the No. 2 oil is 35g/t, so as to obtain zinc concentrate and tailings.

The results of a test comparing the use of zinc sulfate alone as an inhibitor in the lead flotation stage with the flotation process and other chemical systems being unchanged are shown in table 1.

Table 1 comparative results table

Under the condition that the flotation process and other reagent systems are not changed, the combined inhibitor is adopted as the inhibitor compared with single zinc sulfate in the lead flotation stage, so that the using amount of the zinc sulfate can be effectively reduced.

Example 2: the flotation separation experimental study is carried out on certain Liaoning lead-zinc sulfide ore, raw ore contains 4.06% of Pb, 3.58% of Zn and 3.02% of Fe, and main useful minerals are galena and sphalerite. The gangue minerals are mainly calcite and dolomite.

The combined inhibitor is used for flotation separation, and comprises zinc sulfate and iminodisuccinic acid, wherein the mass ratio of the zinc sulfate to the iminodisuccinic acid is 3: 1. As shown in fig. 1, the specific operation is as follows:

(1) grinding raw ore to-0.074 mm which accounts for 75%, and mixing the pulp to obtain ore pulp to be floated;

(2) sequentially adding quicklime serving as an inhibitor of pyrite, a combined inhibitor zinc sulfate and iminodisuccinic acid serving as inhibitors of sphalerite into the ore pulp, and then adding a collecting agent ethiozine and foaming agent No. 2 oil to perform lead flotation operation of primary roughing, tertiary concentration and secondary scavenging to obtain lead concentrate and lead tailings; wherein the total dosage of the quicklime, the combined inhibitor zinc sulfate and iminodisuccinic acid, the ethion nitrogen and the No. 2 oil is 3000 g/t, 1250 g/t, 80 g/t and 40g/t respectively.

(3) And sequentially adding an activating agent copper sulfate, a collecting agent butyl xanthate and foaming agent No. 2 oil into the lead tailings to perform primary roughing, secondary concentration and secondary scavenging zinc flotation operation, wherein the total dosage of the copper sulfate is 200 g/t, the total dosage of the butyl xanthate is 80 g/t and the total dosage of the No. 2 oil is 40g/t, so as to obtain zinc concentrate and tailings.

The results of a test comparing the use of zinc sulfate alone as an inhibitor in the lead flotation stage with the flotation process and other chemical systems being unchanged are shown in table 2.

TABLE 2 comparative results table

The result shows that compared with the traditional inhibitor single zinc sulfate, the addition of the iminodisuccinic acid can reduce the grade of zinc in lead concentrate and effectively improve the lead-zinc separation effect.

Example 3: the flotation separation experimental study is carried out on the lead-zinc sulfide ore of the inner Mongolia, and the raw ore contains 1.80 percent of Pb, 3.41 percent of Zn and 4.32 percent of Fe. Lead in the ore exists mainly in the form of galena, zinc exists mainly in the form of sphalerite, and iron mainly consists of pyrite.

The combined inhibitor is used for flotation separation, and comprises zinc sulfate and iminodisuccinic acid, wherein the mass ratio of the zinc sulfate to the iminodisuccinic acid is 1: 1. As shown in fig. 1, the specific operation is as follows:

(1) grinding raw ore to 80% of minus 0.074mm, and mixing the pulp to obtain ore pulp to be floated;

(2) sequentially adding quicklime serving as an inhibitor of pyrite, a combined inhibitor zinc sulfate and iminodisuccinic acid serving as inhibitors of sphalerite into the ore pulp, and then adding a collecting agent ethiozine and foaming agent No. 2 oil to perform lead flotation operation of primary roughing, tertiary concentration and secondary scavenging to obtain lead concentrate and lead tailings; wherein the total dosage of the quicklime, the combined inhibitor zinc sulfate, the iminodisuccinic acid, the ethion nitrogen and the No. 2 oil is 5000g/t, 2000g/t, 70 g/t and 35g/t respectively.

(3) And sequentially adding an activating agent copper sulfate, a collecting agent butyl xanthate and foaming agent No. 2 oil into the lead tailings to perform primary roughing, secondary concentration and secondary scavenging zinc flotation operation, wherein the total dosage of the copper sulfate is 150g/t, the total dosage of the butyl xanthate is 150g/t and the total dosage of the No. 2 oil is 60g/t, so as to obtain zinc concentrate and tailings.

The results of a test comparing the use of zinc sulfate alone as an inhibitor in the lead flotation stage with the flotation process and other reagent systems being unchanged are shown in table 3.

TABLE 3 comparative results table

The result shows that compared with the traditional inhibitor of single zinc sulfate, the combination of zinc sulfate and iminodisuccinic acid generates better synergistic effect, and the high-efficiency separation of lead and zinc is realized.

While the present invention has been described in detail with reference to the specific embodiments, the present invention is not limited to the embodiments described above, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.