A zinc sulfide inhibitor and a method of making the same

Abstract

The present application belongs to the technical field of dressing reagent research and development, and particularly relates to a zinc sulfide inhibitor and a preparation method thereof; raw material components and weight fractions are as follows: 14-20 parts of direct black BN, 30-40 parts of sodium bisulfite, 30-50 parts of sodium thiosulfate, and the total weight of the raw materials is 100 parts. The present application has better effect than traditional inhibitors, can improve the pH value of the ore pulp while ensuring the flotation index, thereby reducing the corrosion damage of the flotation equipment, and can also alleviate the influence of acidic wastewater on the ecological environment of the mining area. The present application provides a new technology for efficient development of complex multi-metal zinc-containing mineral resources and separation of complex multi-metal mixed minerals, and also provides a new design direction for the use of combined inhibitors.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of developing beneficiation reagents, and particularly relates to a zinc sulfide inhibitor and a preparation method thereof. BACKGROUND

[0002] At present, mineral resources have a trend of being poor, fine and complex, and flotation technology has become an important means for recovering low-grade complex mineral resources. The hydrophobicity of the mineral surface is the basis of mineral flotation, and flotation is a process of enriching target minerals by changing the hydrophobicity of the mineral surface through flotation reagents. The core of flotation technology is flotation reagents. In the face of current complex and difficult-to-process mineral resources, depressants also play a crucial role in flotation. In the past hundred years of development of flotation technology, various flotation depressants have been discovered and utilized, but traditional single flotation depressants cannot meet the current poor, fine and complex mineral resources. In recent years, domestic and foreign beneficiation scholars have developed new structural depressants and combined depressants to improve beneficiation efficiency, especially the use of combined depressants, whether it is the combination of inorganic depressants or the combination of inorganic and organic depressants, reasonable combination of drugs can have a synergistic effect, greatly improving the flotation efficiency of minerals.

[0003] Common zinc sulfide inhibitors include zinc sulfate, sulfur dioxide and sulfite, sodium pyrosulfite, sodium sulfide, cyanide, etc. Zinc sulfate itself is a depressant for sphalerite, and usually has better inhibitory effect in alkaline environment. Zinc sulfate reacts in water to generate Zn(OH)2, and Zn(OH)2 can generate HZnO2 and ZnO2 in alkaline medium, and is adsorbed on the surface of zinc sulfide ore, reducing the floatability of the mineral. Therefore, the combination of zinc sulfate and sodium hydroxide can better inhibit zinc sulfide ore, but the inhibitory effect is poor when zinc sulfate is used alone. Sulfite is dissolved in the ore pulp to generate HSO3 and SO3, thereby adjusting the pH value of the ore pulp, and selectively preventing the adsorption of collectors on the surface of zinc sulfide ore, thereby enhancing the hydrophilicity of zinc sulfide ore. At the same time, sulfite can reduce copper ions on the surface of zinc sulfide ore, thereby reducing the floatability of zinc sulfide ore. Sulfite can form zinc sulfite on the surface of zinc sulfide, making the surface of zinc sulfide more hydrophilic. However, sulfite has strong reducing property and is easy to oxidize and lose effectiveness, and is not stable enough. When sodium pyrosulfite is used as a zinc sulfide inhibitor, it can cause the pH value of the ore pulp to be too low, which can corrode the equipment of the beneficiation plant and also damage the ecological environment of the mining area. When sodium sulfide is used as an inhibitor, it is often because it is decomposed into a large amount of Na, OH, H, HS in the ore pulp, which can cause the pH value of the ore pulp to be too low, thereby corroding the equipment of the beneficiation plant and also damaging the ecological environment of the mining area. - 2- - 2- + - + ​​​​​​​- 、S 2- However, the dosage is large and has a bad smell, resulting in high beneficiation cost and harm to human health. Cyanide can be used as a zinc sulfide inhibitor, but it is highly toxic and harmful to the ecological environment and on-site workers, so it is rarely used in actual production. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application provides a zinc sulfide inhibitor and a preparation method thereof, which improves the problems of destroying the ecological environment, high beneficiation cost, and harm to the health of workers in the concentrator of the conventional inhibitor in the past, and provides a new technology for efficient development of complex multi-metal zinc-containing mineral resources and separation of complex multi-metal mixed minerals, and also provides a completely new design direction for the use of combined inhibitors.

[0005] The technical scheme of the present application is: a zinc sulfide inhibitor, the raw material components and weight fractions are: 14-20 parts of direct black BN of triazo dye, 30-40 parts of sodium bisulfite, 30-50 parts of sodium thiosulfate, and the total weight of the raw materials is 100 parts.

[0006] The further technical scheme is: the raw material components and weight fractions are: 17-20 parts of direct black BN of triazo dye, 14-20 parts of sodium sulfite, 17-20 parts of sodium bisulfite, 40-56 parts of sodium thiosulfate, and the total weight of the raw materials is 100 parts.

[0007] The further technical scheme is: the raw material components and weight fractions are: 17 parts of direct black BN of triazo dye, 20 parts of sodium sulfite, 18 parts of sodium hydroxide, 27 parts of sodium bisulfite, and 18 parts of zinc sulfate, and the total weight of the raw materials is 100 parts.

[0008] The preparation method of any one of the zinc sulfide inhibitors is carried out according to the following steps:

[0009] Step one: after weighing the raw materials according to the proportions, grind them to a fineness of 0.074 mm or less and mix them evenly;

[0010] Step two: place the mixed raw materials into a stirrer, keep stirring, and add water to the stirrer at a weight ratio of 1:9;

[0011] Step three: continue stirring for 30 minutes until the raw materials are fully dissolved.

[0012] Compared with the prior art, the present application has the following advantages:

[0013] (1) The direct black BN 17 of triazo dye in the formula is used as the component of the zinc sulfide inhibitor, which has a significant ore affinity, increases the hydrophilicity of the zinc mineral surface, and thus strengthens the inhibition of the zinc mineral.

[0014] (2) Raw material source is extensive, cost is lower, safety environmental protection;

[0015] (3) The prepared zinc inhibitor can keep the pH value of the ore pulp at 6-7, effectively alleviating the damage of the mineral processing wastewater to the ecological environment and the corrosion damage of the strong acid and alkaline ore pulp to the mineral processing equipment;

[0016] (4) The prepared zinc inhibitor is very stable, not easy to fail, and convenient for transportation and storage. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 The flow chart of the preparation method of any one of the zinc sulfide inhibitors described in the application.

[0018] Figure 2 It is a molecular structural formula of direct black BN of triazo dye. DETAILED DESCRIPTION

[0019] The novel zinc sulfide inhibitor is further verified and illustrated by examples. The test is only used to explain the application, and cannot limit the use of the application.

[0020] Example 1

[0021] As shown in the figure, the embodiment is an example of the preparation method of the zinc sulfide inhibitor described in the application, Figure 1

[0022] The raw material components are 17 parts of direct black BN of triazo dye, 20 parts of sodium sulfite, 18 parts of sodium hydroxide, 27 parts of sodium bisulfite and 18 parts of zinc sulfate, with a total weight of 100 parts.

[0023] Step one: after weighing the raw materials according to the above proportion, grind them to a fineness of 0.074 mm or less and mix them uniformly;

[0024] Step two: put the uniformly mixed raw materials into a stirrer, keep stirring and add water to the stirrer at a weight ratio of 1:9;

[0025] Step three: continue stirring for 30 minutes until the raw materials are fully dissolved, and the zinc sulfide inhibitor is obtained.

[0026] Example 2

[0027] The embodiment is an application example of the zinc sulfide inhibitor described in the application, and the method for inhibiting zinc of complex multi-metal mixed minerals using the zinc sulfide inhibitor described in example 1, which includes the following steps:

[0028] Step one: grind the broken ore with water to a suitable fineness of ore pulp, so that the mass concentration of the ore pulp is about 37%;

[0029] ​Step two: take the above zinc sulfide inhibitor, according to the amount of 0.5kg-2kg per ton of ore, add the zinc sulfide inhibitor solution into the selected ore slurry;

[0030] Step three: add appropriate amount of 40g / t collector TLQ2 and 20g / t frother MIBC for flotation, and the flotation time is 5 minutes.

[0031] Flotation test:

[0032] A certain copper-zinc mine in Africa, the main metal elements of the copper-zinc mine are copper, zinc, lead, gold and silver. The content of each component is respectively copper 0.86%, zinc 3.91%, lead 0.14%, iron 36.22%, sulfur 42.19%, gold 0.44g / t, and silver 25.5g / t. Among them, the main copper minerals in the valuable minerals are chalcopyrite, chalcocite, blue copper, bornite and tetrahedrite. Other valuable metals are sphalerite, galena, etc., and gangue minerals mainly include pyrite, pyrrhotite, quartz, mica, clay (kaolinite, dolomite and trace chlorite and biotite), iron oxide (mainly hematite and goethite, also containing a small amount of magnetite and jarosite), calcite, feldspar (orthoclase, dolomite and lapis lazuli), arsenopyrite and argentite, etc. Chalcopyrite in the ore is mainly associated with pyrite, followed by sphalerite, and sphalerite is mainly associated with pyrite, followed by copper sulfide minerals. Take 300g of the copper-zinc ore and mix it with 800mL of water to add 1L of hanging tank flotation machine for flotation test, add 0.5kg / t of the zinc sulfide inhibitor according to the present application, stir for 3 minutes, then add 40g / t of collector TLQ2 and 20g / t of frother MIBC, stir for 2 minutes, and collect the concentrate tailings product after 5 minutes of flotation, filter, dry and weigh. Under the same conditions, add the same amount of sodium pyrosulfite as a comparison, and the zinc content and zinc recovery rate in the copper concentrate obtained are shown in Table 1.

[0033] Table 1 Zinc inhibition test results of copper-zinc ore

[0034]

[0035] Example 3

[0036] A zinc sulfide inhibitor, the raw material components are as follows in weight fraction: 20 parts of direct black BN, 30 parts of sodium bisulfite, and 50 parts of sodium thiosulfate, and the total weight of the raw materials is 100 parts.

[0037] The preparation steps of the zinc mineral inhibitor in this example are as in Example 1.

[0038] The zinc inhibition method steps of the multi-metal mixed ore in this example are as in Example 2.

[0039] The mixed ore used in the test is a copper-zinc ore in Africa in Example 2. 300 g of the copper-zinc ore is mixed with 800 mL of water and added to a 1 L hanging tank flotation machine for a flotation test. The zinc sulfide inhibitor described in the application is added at 1.0 kg / t and stirred for 3 minutes, then 40 g / t of collector TLQ2 and 20 g / t of frother MIBC are added and stirred for 2 minutes. After 5 minutes of flotation, the concentrate tailing products are collected, filtered, dried, and weighed. Under the same conditions, the same amount of sodium pyrosulfite is added as a comparison, and the zinc content and zinc recovery rate in the copper concentrate obtained are shown in Table 2.

[0040] Table 2 Zinc inhibition test results of copper-zinc ore

[0041]

[0042] Example 4

[0043] A copper sulfide inhibitor, the raw material components are as follows in parts by weight: 14 parts of direct black BN, 14 parts of sodium sulfite, 16 parts of sodium bisulfite, and 56 parts of sodium thiosulfate. The total weight of the raw materials is 100 parts.

[0044] The preparation steps of the zinc mineral inhibitor in this example are the same as in Example 1.

[0045] The zinc inhibition method steps of the multi-metal mixed ore in this example are the same as in Example 2.

[0046] The mixed ore used in the test is a copper-zinc ore in Africa in Example 2. 300 g of the copper-zinc ore is mixed with 800 mL of water and added to a 1 L hanging tank flotation machine for a flotation test. The zinc sulfide inhibitor described in the application is added at 1.0 kg / t and stirred for 3 minutes, then 40 g / t of collector TLQ2 and 20 g / t of frother MIBC are added and stirred for 2 minutes. After 5 minutes of flotation, the concentrate tailing products are collected, filtered, dried, and weighed. Under the same conditions, the same amount of sodium pyrosulfite is added as a comparison, and the zinc content and zinc recovery rate in the copper concentrate obtained are shown in Table 2.

[0047] Table 3 Zinc inhibition test results of copper-zinc ore

[0048]

[0049] The preferred embodiments of the present application are described in detail above, and from the test results of Tables 1 to 3, it can be seen that after changing the reagent system, the copper ore grade and recovery rate are slightly improved, the zinc recovery rate is reduced by 4-6 percentage points, thereby better realizing copper-zinc separation, and the pulp pH value is also increased from 4.44 to 6-7. In the above invention content and the technical details of the embodiments mentioned above, any combination can be used without contradiction, and the above will not be repeated. At the same time, as long as the design idea based on the concept of the present application is used, it is considered as the disclosed content of the present application. The protection scope of the present application is not limited to the above content and the specific embodiments, and the simple change and replacement scheme based on the technical scheme and concept of the present application also belongs to the protection scope of the present application.

Claims

1. A zinc sulfide inhibitor, characterized in that, The raw material composition and weight parts are as follows: 14-20 parts of triazo dye Direct Black BN1, 30-40 parts of sodium bisulfite, 30-50 parts of sodium thiosulfate, and a total weight of 100 parts of raw materials.

2. The zinc sulfide inhibitor according to claim 1, characterized in that, The raw material composition and weight percentages are as follows: 17-20 parts of triazo dye Direct Black BN, 14-20 parts of sodium sulfite, 14-20 parts of sodium bisulfite, 40-56 parts of sodium thiosulfate, and a total weight of 100 parts of raw materials.

3. The zinc sulfide inhibitor according to claim 1, characterized in that, The raw material composition and weight parts are as follows: 17 parts of triazo dye Direct Black BN, 20 parts of sodium sulfite, 18 parts of sodium hydroxide, 27 parts of sodium bisulfite, 18 parts of zinc sulfate, and a total weight of 100 parts of raw materials.

4. A method for preparing any one of the zinc sulfide inhibitors according to claims 1-3, characterized in that, Follow these steps: Step 1: Weigh each raw material according to the stated ratio, grind them to a fineness of less than 0.074 mm, and mix them evenly; Step 2: Place the well-mixed ingredients into a mixer, keep mixing, and add water to the mixer at a weight ratio of 1:9; Step 3: Continue stirring for 30 minutes until the raw materials are fully dissolved to obtain the zinc sulfide inhibitor.

5. The application of any one of the zinc sulfide inhibitors according to claims 1-3 in inhibiting zinc in complex polymetallic mixed minerals, characterized in that, Includes the following steps: Step 1: Grind the crushed ore with water to make a slurry of suitable fineness, so that the mass concentration of the slurry is 37%; Step 2: Take the zinc sulfide inhibitor and calculate the dosage as 0.5kg-2kg per ton of ore, then add the zinc sulfide inhibitor solution to the ore slurry to be processed; Step 3: Add 40g / t collector TLQ2 and 20g / t frother MIBC for flotation, and the flotation time is 5 minutes.

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