A method for preparing and flotating gypsum-containing zinc oxide ore

Abstract

This invention discloses a method for preparing and flotating gypsum-containing zinc oxide ore, comprising the following steps: grinding the raw ore finely, sequentially adding a high-molecular-weight calcium ion chelating agent, sodium carbonate, and sodium sulfide to prepare the slurry, and finally adding a collector to perform zinc oxide mineral flotation to obtain zinc oxide rough concentrate. This invention overcomes the influence of soluble salt mineral gypsum, has strong adaptability, is simple to apply, and is convenient for large-scale production management, enabling efficient flotation recovery of this type of zinc resource.

Description

Technical Field

[0001] This invention belongs to the field of mineral processing engineering technology, and specifically relates to a method for preparing and flotating gypsum-containing zinc oxide ore. Background Technology

[0002] Zinc is an important raw material for national economic development. Due to its excellent wear resistance, corrosion resistance, and ductility, it is widely used in construction, automotive, electromechanical, chemical, pharmaceutical, and military industries. Zinc-bearing mineral resources are divided into sulfide ores and oxide ores. For a long time, zinc sulfide minerals, represented by sphalerite, have been the main source of zinc resource recovery. However, with the increasing development of high-quality zinc sulfide resources, these resources have become increasingly scarce, fine-grained, and impure in recent years. Therefore, improving efficient and clean recovery technologies for zinc oxide resources is beneficial to safeguarding my country's zinc resource status.

[0003] Zinc oxide ores have complex compositions and may contain soluble salts such as gypsum, as seen in ultra-large non-sulfide lead-zinc deposits like the Lanping and Huoshaoyun mines. The presence of soluble salts like gypsum negatively impacts the flotation of zinc oxide minerals. The calcium ions produced by their dissolution act on the surface of zinc oxide minerals, affecting the sulfidation of sulfiding agents and the adsorption of collectors. Furthermore, the dissolution of carbonate minerals in the ore and the addition of sodium carbonate as a modifier can also generate carbonate ions that react with calcium ions to form precipitates. These precipitates coat the surface of zinc oxide minerals, hindering the action of sulfiding agents, collectors, and other reagents, thus affecting the efficient flotation and recovery of zinc resources. Summary of the Invention

[0004] The purpose of this invention is to provide a method for preparing and flotating gypsum-containing zinc oxide ore, so as to solve the problem of poor separation index caused by gypsum in the sulfidation-amine flotation process of zinc oxide ore.

[0005] This invention provides a method for preparing and flotating gypsum-containing zinc oxide ore, comprising the following steps:

[0006] S1. The raw ore is crushed and ground to obtain the ground product;

[0007] S2. After adding a high molecular weight calcium ion chelating agent to the grinding product obtained in step S1, the mixture is slurry-conditioned to obtain slurry-conditioned product 1.

[0008] S3. Add sodium carbonate to the prepared slurry product 1 obtained in step S2 and then prepare the slurry to obtain prepared slurry product 2.

[0009] S4. Add sodium sulfide to the prepared slurry product 2 obtained in step S3 and then prepare the slurry to obtain prepared slurry product 3;

[0010] S5. Add collector to the slurry product 3 obtained in step S4, stir, and aerate to carry out zinc oxide flotation to obtain zinc oxide concentrate and tailings.

[0011] Furthermore, in step S1, the -0.074mm particle size accounts for 75% to 90% of the grinding product; the raw ore is zinc oxide ore, and its gangue minerals contain gypsum.

[0012] In the technical solution of this invention, all g / t refers to the mass of the raw ore.

[0013] Furthermore, in step S2, the polymeric calcium ion chelating agent is at least one of gum arabic, gelatin, and carboxymethyl cellulose; the amount of polymeric calcium ion chelating agent added is 100-500 g / t.

[0014] Furthermore, in step S3, the amount of sodium carbonate added is 1000-5000 g / t.

[0015] Furthermore, in step S4, the amount of sodium sulfide added is 10,000 to 40,000 g / t; the slurry preparation process conditions after adding sodium sulfide are: stirring for 5 to 20 minutes.

[0016] Furthermore, in step S5, the collector is one or more of dodecylamine, hexadecylamine, and octadecylamine; the amount of the collector added is 50-400 g / t.

[0017] The principle of this invention:

[0018] The present invention targets gypsum-containing zinc oxide ore. During the grinding and flotation slurry preparation process, the calcium ions generated by the dissolution of gypsum act on the surface of zinc oxide minerals. After adding a high molecular weight calcium ion chelating agent, the calcium ions on the mineral surface are desorbed from the mineral surface under the action of this chelating agent. After adding the modifier sodium carbonate, the carbonate ions react with the calcium ions to form calcium carbonate precipitate. At the same time, under the action of the high molecular weight chelating agent, the calcium carbonate crystals flocculate, effectively reducing their impact on the surface of zinc oxide minerals.

[0019] The beneficial effects of this invention are:

[0020] The method of this invention is highly adaptable to gypsum-containing zinc oxide ores, and can reduce the adsorption of calcium ions dissolved in gypsum on the surface of zinc oxide minerals such as smithsonite, effectively reduce the formation of calcium carbonate on the mineral surface, further improve the surface sulfidation efficiency of sodium sulfide, and help to achieve efficient flotation recovery of zinc oxide minerals by the amine sulfide method.

[0021] The method of this invention has a simple process flow, is easy to industrial production, has good adaptability to gypsum-containing zinc oxide ore, and can obtain better zinc oxide flotation indicators. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the process flow of the method of the present invention. Detailed Implementation

[0023] To make the objectives, application methods, and beneficial effects of the present invention clearer, the embodiments of the present invention will be described in detail below to facilitate understanding by those skilled in the art.

[0024] Example 1

[0025] A certain gypsum-bearing zinc oxide ore has a Zn grade of 5.13% and a Ca content of 12.87%. The specific flotation process includes the following steps:

[0026] 1) The raw ore is crushed and ground, and the resulting grinding product contains 75% particles of -0.074mm size;

[0027] 2) Add the high molecular weight calcium ion chelating agent gum arabic to the grinding product obtained in step 1), the amount of which is 100g / t based on the weight of the raw ore, and stir the slurry for 3 minutes.

[0028] 3) Add sodium carbonate to the slurry product obtained in step 2), at a rate of 1000 g / t based on the weight of the raw ore, and stir for 3 minutes.

[0029] 4) Add sodium sulfide to the slurry product obtained in step 3). The amount of sodium sulfide added is 10,000 g / t based on the weight of the raw ore. Stir for 20 minutes after adding the sodium sulfide.

[0030] 5) Add dodecylamine, a collector, to the slurry product obtained in step 4). The amount of collector added is 100 g / t based on the weight of the raw ore. After stirring and aeration, zinc oxide flotation is carried out for 5 minutes to obtain zinc oxide concentrate and zinc oxide tailings. The test results are shown in Table 1.

[0031] Comparative Example 1

[0032] All other conditions were the same as in Example 1, except that the high molecular weight calcium ion chelating agent gum arabic was not added. The test results are shown in Table 1.

[0033] Comparative Example 2

[0034] All other conditions were the same as in Example 1, except that sodium carbonate, the modifier, was not added. The test results are shown in Table 1.

[0035] Comparative Example 3

[0036] All other conditions were the same as in Example 1, except that sodium carbonate was added first as a modifier, and gum arabic, a high-molecular-weight calcium ion chelating agent, was added later. The test results are shown in Table 1.

[0037] Table 1. Flotation Test Results / %

[0038]

[0039] Example 2

[0040] A certain gypsum-bearing zinc oxide ore has a Zn grade of 6.38% and a Ca content of 28.55%. The specific flotation process includes the following steps:

[0041] 1) The raw ore is crushed and ground, and the resulting grinding product contains 90% particles of -0.074mm size;

[0042] 2) Add the high molecular weight calcium ion chelating agent gum arabic and gelatin (mass ratio 1:1) to the grinding product obtained in step 1). The total amount added is 500g / t based on the mass of the raw ore. Mix the slurry for 3 minutes.

[0043] 3) Add sodium carbonate to the slurry product obtained in step 2), at a rate of 5000 g / t based on the weight of the raw ore, and stir for 3 minutes.

[0044] 4) Add sodium sulfide to the slurry product obtained in step 3). The amount of sodium sulfide added is 40,000 g / t based on the weight of the raw ore. Stir for 5 minutes after adding the sodium sulfide.

[0045] 5) Add dodecylamine, a collector, to the slurry product obtained in step 4). The amount of collector added is 200 g / t based on the weight of the raw ore. After stirring and aeration, zinc oxide flotation is carried out for 5 minutes to obtain zinc oxide concentrate and zinc oxide tailings. The test results are shown in Table 2.

[0046] Comparative Example 4

[0047] All other conditions were the same as in Example 2, except that the high molecular weight calcium ion chelating agents gum arabic and gelatin were not added. The test results are shown in Table 2.

[0048] Comparative Example 5

[0049] All other conditions were the same as in Example 2, except that sodium carbonate, the modifier, was not added. The test results are shown in Table 2.

[0050] Comparative Example 6

[0051] All other conditions were the same as in Implementation 2, except that sodium carbonate was added first as a modifier, followed by gum arabic and gelatin as high-molecular-weight calcium ion chelating agents. The test results are shown in Table 2.

[0052] Table 2 Flotation Test Results / %

[0053]

[0054]

[0055] Example 3

[0056] A certain gypsum-bearing zinc oxide ore has a Zn grade of 8.13% and a Ca content of 23.46%. The specific flotation process includes the following steps:

[0057] 1) The raw ore is crushed and ground, and the resulting grinding product contains 85% particles of -0.074mm size;

[0058] 2) Add the high molecular weight calcium ion chelating agent gum arabic, gelatin, and carboxymethyl cellulose (mass ratio 1:1:1) to the grinding product obtained in step 1). The total amount added is 300g / t based on the mass of the raw ore. Mix the slurry for 3 minutes.

[0059] 3) Add sodium carbonate to the slurry product obtained in step 2), at a rate of 3000 g / t based on the weight of the raw ore, and stir for 3 minutes.

[0060] 4) Add sodium sulfide to the slurry product obtained in step 3). The amount of sodium sulfide added is 25,000 g / t based on the weight of the raw ore. Stir for 15 minutes after adding the sodium sulfide.

[0061] 5) Add dodecylamine, a collector, to the slurry product obtained in step 4). The amount of collector added is 250 g / t based on the weight of the raw ore. After stirring and aeration, zinc oxide flotation is carried out for 6 minutes to obtain zinc oxide concentrate and zinc oxide tailings. The test results are shown in Table 3.

[0062] Comparative Example 7

[0063] All other conditions were the same as in Example 3, except that the high molecular weight calcium ion chelating agents gum arabic and gelatin were not added. The test results are shown in Table 3.

[0064] Comparative Example 8

[0065] All other conditions were the same as in Example 3, except that sodium carbonate, the modifier, was not added. The test results are shown in Table 3.

[0066] Comparative Example 9

[0067] All other conditions were the same as in Implementation 3, except that sodium carbonate was added first as a modifier, followed by the addition of gum arabic and gelatin as high-molecular-weight calcium ion chelating agents. The test results are shown in Table 3.

[0068] Table 3 Flotation Test Results / %

[0069]

[0070] In summary, it can be seen that the absence of either the polymeric calcium ion chelating agent or sodium carbonate makes it difficult to obtain better flotation indicators. At the same time, the order of addition of the polymeric calcium ion chelating agent and sodium carbonate cannot be reversed, otherwise it will be difficult to exert a beneficial effect. The two have different mechanisms of influence on the inevitable ion migration on the mineral surface. After the calcium ions dissolved by gypsum are desorbed from the surface of zinc oxide minerals by the polymeric chelating agent, sodium carbonate can then show its conditioning effect on the pulp.

Claims

1. A method for preparing and flotating gypsum-containing zinc oxide ore, characterized in that, Includes the following steps: S1. The raw ore is crushed and ground to obtain the ground product; S2. After adding a high molecular weight calcium ion chelating agent to the grinding product obtained in step S1, the mixture is slurry-conditioned to obtain slurry-conditioned product 1. S3. Add sodium carbonate to the prepared slurry product 1 obtained in step S2 and then adjust the slurry to obtain prepared slurry product 2. S4. Add sodium sulfide to the prepared slurry product 2 obtained in step S3 and then prepare the slurry to obtain prepared slurry product 3; S5. Add a collector to the slurry product 3 obtained in step S4, stir, and aerate to carry out zinc oxide flotation to obtain zinc oxide concentrate and tailings; In step S2, the high molecular weight calcium ion chelating agent is at least one of gum arabic, gelatin, and carboxymethyl cellulose; the amount of high molecular weight calcium ion chelating agent added is 100~500g / t.

2. The method for preparing and flotating gypsum-containing zinc oxide ore according to claim 1, characterized in that, In step S1, the -0.074mm particle size accounts for 75% to 90% of the grinding product; the raw ore is zinc oxide ore, and its gangue minerals contain gypsum.

3. The method for preparing and flotating gypsum-containing zinc oxide ore according to claim 1, characterized in that, In step S3, the amount of sodium carbonate added is 1000~5000g / t.

4. The method for preparing and flotating gypsum-containing zinc oxide ore according to claim 1, characterized in that, In step S4, the amount of sodium sulfide added is 10,000~40,000 g / t; the slurry preparation conditions after adding sodium sulfide are: stirring for 5~20 min.

5. The method for preparing and flotating gypsum-containing zinc oxide ore according to claim 1, characterized in that, In step S5, the collector is one or more of dodecylamine, hexadecylamine, and octadecylamine.

6. The method for preparing and flotating gypsum-containing zinc oxide ore according to claim 5, characterized in that, The amount of the collector added is 50~400g / t.

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