阅读说明：本技术 一种铅硫硫化矿浮选分离的组合抑制剂及应用 (Combined inhibitor for lead-sulfur sulfide ore flotation separation and application ) 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 2021-08-09 设计创作，主要内容包括：本发明公开了一种铅硫硫化矿浮选分离的组合抑制剂及应用,包括L-半胱氨酸和聚萘甲醛磺酸钠,该组合抑制剂用于方铅矿和黄铁矿的浮选分离；本发明将原矿进行磨矿,得到待浮选矿浆；向矿浆中依次加入硫酸锌、乙基黄药和2号油进行铅硫混合浮选作业,得到铅硫混合精矿；再向铅硫混合精矿中加入L-半胱氨酸+聚萘甲醛磺酸钠作为黄铁矿的组合抑制剂并进行铅硫分离浮选作业,得到铅精矿和硫精矿；该组合抑制剂对于黄铁矿具有较强的选择抑制作用,有效实现了方铅矿与黄铁的浮选分离,且具有用量低、水溶性好、可生物降解、无毒的优异特征,对于提高我国复杂铅锌硫硫化矿的浮选水平和资源综合利用率,具有较大的理论价值和经济价值。(The invention discloses a combined inhibitor for flotation separation of lead-sulfur sulfide ores and application thereof, wherein the combined inhibitor comprises L-cysteine and sodium polynaphthalenesulfonate, and is used for flotation separation of galena and pyrite; grinding raw ore to obtain ore pulp to be floated; adding zinc sulfate, ethyl xanthate and No. 2 oil into the ore pulp in sequence to perform lead-sulfur mixed flotation operation to obtain lead-sulfur mixed concentrate; adding L-cysteine and sodium polynaphthalenesulfonate as a combined inhibitor of pyrite into the lead-sulfur bulk concentrate, and performing lead-sulfur separation flotation operation to obtain lead concentrate and sulfur concentrate; the combined inhibitor has a strong selective inhibition effect on pyrite, effectively realizes flotation separation of galena and pyrite, has the excellent characteristics of low dosage, good water solubility, biodegradability and no toxicity, and has a large theoretical value and economic value for improving the flotation level and comprehensive resource utilization rate of complex lead-zinc-sulfur sulfide ores in China.)

1. A combined inhibitor for flotation separation of lead-sulfur sulfide ores is characterized by comprising L-cysteine and sodium polynaphthalenesulfonate.

2. The combined depressant for lead-sulfur sulfide ore flotation separation of claim 1, wherein: the combined inhibitor is used for flotation separation of galena and pyrite.

3. The application of the combined inhibitor for the flotation separation of the lead-sulfur sulfide ore according to the claims 1-2 is characterized by comprising the following specific steps:

grinding and size mixing raw ores to obtain ore pulp to be floated;

adding zinc sulfate serving as an inhibitor of sulfide ore into ore pulp, adding a collecting agent ethyl xanthate and foaming agent No. 2 oil, performing lead-sulfur mixed flotation operation, and performing primary rough concentration to obtain lead-sulfur mixed concentrate and mixed tailings;

(3) performing lead-sulfur separation flotation operation on the lead-sulfur bulk concentrate obtained in the step (2) to obtain lead concentrate and sulfur concentrate, wherein the lead-sulfur separation flotation operation comprises primary lead roughing, secondary lead concentration and secondary lead scavenging, L-cysteine and sodium polynaphthalenesulfonate are added in the lead roughing and concentrating operation to serve as a combined inhibitor of iron sulfide ore, and ethionamide and No. 2 oil are added in the lead roughing and lead scavenging operation to serve as a collecting agent and a foaming agent of lead sulfide ore;

(4) and (3) adding a collecting agent ethyl xanthate and foaming agent No. 2 oil into the mixed tailings obtained in the step (2) to carry out scavenging operation twice to obtain mixed coarse tailings.

4. The use of the combined depressant for lead-sulfur sulfide ore flotation separation according to claim 3, wherein: in the step (1), the particles which are ground to-0.074 mm account for more than 70 percent of the total mass of the raw ore.

5. The use of the combined depressant for lead-sulfur sulfide ore flotation separation according to claim 3, wherein: the mass ratio of the L-cysteine to the sodium polynaphthalenesulfonate added in the step (3) is 0.5-1.

6. The use of the combined depressant for lead-sulfur sulfide ore flotation separation according to claim 3, wherein: the total dosage of the combined inhibitor of the L-cysteine and the sodium polynaphthalenesulfonate added in the step (3) is 2500-4000 g/t.

Technical Field

The invention belongs to the technical field of sulfide ore dressing, relates to a combined inhibitor for lead-sulfur sulfide ore flotation separation and application thereof, and particularly relates to application of L-cysteine and sodium polynaphthalenesulfonate as an inhibitor of gangue mineral pyrite in the process of lead-sulfur sulfide ore flotation separation.

Background

Mineral products, an important nonferrous metal, are widely used in various fields of national economy, including steel, chemistry, machinery, military industry and the like. Chinese galena has rich resources, but generally has the characteristics of less rich ore, more low-grade ore, more associated elements, complex ore property and the like. Along with the rapid development of the economy of China, the demand of China for lead resources is increasing day by day. Galena is usually associated with zinc blende and pyrite, which is a gangue mineral, often enters lead concentrate in the flotation separation process, so that the grade of the lead concentrate is low, and further the cost of the smelting process is high. In recent years, with the continuous and deep research, the lead-sulfur flotation separation technology has made great progress, but still has great development space.

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. The traditional pyrite inhibitor lime has the problems of serious pipeline scaling and blockage, low recovery rate of associated metal, environmental pollution, high backwater treatment cost and the like in production. The reasonable use of the inhibitor can improve the comprehensive utilization rate of mineral resources, relieve the environmental pressure and improve the economic benefit. At present, the synergistic effect of inhibitors of different types can be fully exerted by the combined use of the inhibitors to realize high-efficiency separation, and the combined medicament is an important direction for developing novel lead-sulfur separation inhibitors and provides a thought for the mineral separation development of complex sulfide ores.

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 high-efficiency separation of lead-sulfur sulfide ores, the combined inhibitor comprises L-cysteine and sodium polynaphthalenesulfonate, and the combined inhibitor is non-toxic, biodegradable and has strong selective inhibition effect on pyrite.

The combined inhibitor comprises L-cysteine and sodium polynaphthalenesulfonate and is used for flotation separation of galena and pyrite.

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

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

(2) adding zinc sulfate serving as an inhibitor of sulfide ore into ore pulp, adding a collecting agent ethyl xanthate and foaming agent No. 2 oil, performing lead-sulfur mixed flotation operation, and performing primary roughing operation to obtain lead-sulfur mixed concentrate and mixed tailings;

(3) and (3) carrying out lead-sulfur separation flotation operation on the lead-sulfur bulk concentrate obtained in the step (2) to obtain lead concentrate and sulfur concentrate. The lead-sulfur separation flotation operation comprises primary lead roughing, secondary lead concentration and secondary lead scavenging, wherein L-cysteine and sodium polynaphthalenesulfonate are added in the lead roughing and concentrating operation as a combined inhibitor of iron sulfide ore, and ethionamide and No. 2 oil are added in the lead roughing and lead scavenging operation as a collecting agent and a foaming agent of the lead sulfide ore;

(4) and (3) adding a collecting agent ethyl xanthate and foaming agent No. 2 oil into the mixed tailings obtained in the step (2) to carry out scavenging operation twice to obtain mixed coarse tailings.

In the step (1), the particles which are ground to-0.074 mm account for more than 70 percent of the total mass of the raw ore.

The mass ratio of the L-cysteine to the sodium polynaphthalenesulfonate added in the step (3) is 0.5-1.

The total dosage of the combined inhibitor of the L-cysteine and the sodium polynaphthalenesulfonate added in the step (3) is 2500-4000 g/t. The dosage of the combined inhibitor has a great relationship with the Fe grade in the raw ore, and the total dosage of the combined inhibitor is increased along with the increase of the Fe grade content in the raw ore.

The invention is characterized in that: in the flotation separation of the lead-sulfur sulfide ore, the combined inhibitor L-cysteine and sodium polynaphthalenesulfonate mainly utilizes a large number of active functional groups such as sulfydryl, carboxyl, sulfonic acid and the like in the molecular structure to selectively adsorb on the surface of the pyrite, so that the hydrophilicity of the surface of the pyrite is enhanced, and therefore, the pyrite is selectively inhibited from entering flotation tailings, and the efficient flotation separation of galena and pyrite is realized.

Compared with the inhibitor lime 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 clean and efficient separation of galena and pyrite, 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 pyrite, and can effectively realize flotation separation of galena and pyrite.

(3) The L-cysteine and the sodium polynaphthalenesulfonate have the excellent characteristics of low dosage, good water solubility, biodegradability and no toxicity.

Drawings

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

Detailed Description

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-sulfur sulphide ore in Yunnan, the raw ore contains 6.35 percent of Pb, 12.32 percent of Zn and 8.65 percent of Fe, and the main useful minerals are galena, sphalerite and pyrite. The gangue has low mineral content, mainly including quartz, calcite, etc.

The combined inhibitor is adopted for flotation separation, and comprises L-cysteine and sodium polynaphthalenesulfonate in a mass ratio of 0.8. As shown in fig. 1, the specific operation is as follows:

(1) grinding the raw ore until the ore is ground to be 75% of-0.074 mm, and mixing the pulp to obtain ore pulp to be floated;

(2) adding 2000g/t of zinc sulfate serving as an inhibitor of zinc blende into the ore pulp, adding 80g/t of ethyl xanthate serving as a collector of galena and pyrite and 35g/t of foaming agent No. 2 oil, then performing lead-sulfur roughing I, and obtaining lead-sulfur mixed rough concentrate and mixed tailings after primary roughing;

(3) performing lead-sulfur separation flotation operation on the lead-sulfur bulk concentrate obtained in the step (2), wherein the lead-sulfur separation flotation operation comprises primary lead roughing, secondary lead concentration and secondary lead scavenging, and L-cysteine and sodium polynaphthalenesulfonate are added into the lead roughing and lead concentrating operation to serve as a combined inhibitor of pyrite, and the total dosage is 3500 g/t; adding collecting agents of ethyl sulfur nitrogen and foaming agent No. 2 oil in lead roughing and scavenging operation, wherein the total usage amount is 30 g/t and 20 g/t respectively, and obtaining lead concentrate and sulfur concentrate through once roughing, twice concentrating and twice scavenging;

(4) and (3) adding the mixed tailings obtained in the step (2) into a collecting agent ethyl xanthate and foaming agent No. 2 oil to perform lead-sulfur scavenging twice to obtain mixed coarse tailings, wherein the total dosage of the mixed coarse tailings is 30 g/t and 15 g/t respectively.

This example compares the results of tests using lime as an inhibitor in the lead-sulfur separation stage, with flotation and other chemical regimes unchanged, as shown in table 1.

TABLE 1 flotation test results for lead-sulfur sulfide ores

The results show that the invention can realize the separation of galena and pyrite, and compared with the traditional inhibitor lime, the dosage of the combined inhibitor is greatly reduced.

Example 2: the flotation separation experimental study is carried out on lead-zinc-sulfur sulphide ore of inner Mongolia, raw ore contains 1.80% of Pb, 3.41% of Zn and 6.59% of Fe, lead in the ore mainly exists in the form of galena, zinc mainly exists in the form of sphalerite, and iron mainly exists in the form of pyrite.

The combined inhibitor is adopted for flotation separation, and comprises L-cysteine and sodium polynaphthalenesulfonate in a mass ratio of 0.5. As shown in fig. 1, the specific operation is as follows:

(1) grinding the raw ore until the ore with the particle size of-0.074 mm accounts for 70%, and mixing the ore pulp to obtain ore pulp to be floated;

(2) adding 1500g/t of zinc sulfate serving as an inhibitor of zinc blende into the ore pulp, adding 60 g/t of ethyl xanthate serving as a collector of galena and pyrite and 30 g/t of foaming agent No. 2 oil, then performing lead-sulfur roughing I, and performing primary roughing to obtain lead-sulfur mixed rough concentrate and mixed tailings;

(3) performing lead-sulfur separation flotation operation on the lead-sulfur bulk concentrate obtained in the step (2), wherein the lead separation flotation operation comprises primary lead roughing, secondary lead concentration and secondary lead scavenging, and L-cysteine and sodium polynaphthalenesulfonate are added in the lead roughing and lead concentrating operation to serve as a combined inhibitor of pyrite, and the total dosage is 2500 g/t; adding collecting agents of ethionine and nitrogen and foaming agent No. 2 oil into the lead roughing and scavenging operations, wherein the total usage amounts are 25g/t and 15 g/t respectively, and obtaining lead concentrate and sulfur concentrate through one-time roughing, two-time concentrating and two-time scavenging;

(4) and (3) adding the mixed tailings obtained in the step (2) into a collecting agent ethyl xanthate and foaming agent No. 2 oil to perform scavenging operation twice to obtain mixed coarse tailings, wherein the total dosage of the mixed coarse tailings is 25g/t and 10 g/t respectively.

The test results of this example are shown in table 2, and the data in table 2 show that the combination inhibitor of L-cysteine and sodium polynaphthalenesulfonate produces better synergistic effect, and realizes high-efficiency separation of galena from pyrite.

TABLE 2 flotation test results for lead-sulfur sulfide ores

Example 3: the research of a flotation separation test is carried out on certain lead-zinc-sulfur sulphide ore in Yunnan, the raw ore contains 6.05 percent of Pb, 16.80 percent of Zn and 11.94 percent of Fe, and useful minerals mainly comprise galena, sphalerite and pyrite. The gangue minerals are mainly calcite and dolomite.

The combined inhibitor is adopted for flotation separation, and comprises L-cysteine and sodium polynaphthalenesulfonate in a mass ratio of 1. As shown in fig. 1, the specific operation is as follows:

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

(2) adding 2500g/t of zinc sulfate serving as an inhibitor of zinc blende into the ore pulp, adding 70 g/t of ethyl xanthate serving as a collector of galena and pyrite and 40 g/t of foaming agent No. 2 oil, then performing lead-sulfur roughing I, and performing primary roughing to obtain lead-sulfur rough concentrate and mixed tailings;

(3) performing lead-sulfur separation flotation operation on the lead-sulfur bulk concentrate obtained in the step (2), and adding L-cysteine and sodium polynaphthalenesulfonate as a combined inhibitor of pyrite in lead roughing and concentration operation, wherein the total dosage is 4000 g/t; adding collecting agents of ethyl sulfur nitrogen and foaming agent No. 2 oil in lead roughing and scavenging operation, wherein the total usage amount is 40 g/t and 25g/t respectively, and obtaining lead concentrate and sulfur concentrate through once roughing, twice concentrating and twice scavenging;

(4) and (3) adding the mixed tailings obtained in the step (2) into a collecting agent ethyl xanthate and foaming agent No. 2 oil to perform scavenging operation twice to obtain mixed coarse tailings, wherein the total dosage of the mixed coarse tailings is 35g/t and 20 g/t respectively.

The test results of the embodiment are shown in Table 3, and the results show that the L-cysteine and sodium polynaphthalenesulfonate combined inhibitor has high separation efficiency, is non-toxic and environment-friendly, and has strong applicability.

TABLE 3 flotation test results for lead-sulfur sulfide ores

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.