Size mixing and flotation method for gypsum-containing zinc oxide ore

Abstract

The invention discloses a size mixing and flotation method for gypsum-containing zinc oxide ore, which comprises the following steps of: grinding raw ore, sequentially adding a macromolecular calcium ion chelating agent, sodium carbonate and sodium sulfide for size mixing, and finally adding a collecting agent for flotation of zinc oxide ore to obtain zinc oxide rough concentrate. According to the method, the influence of soluble salt mineral gypsum can be overcome, the adaptability is high, the application method is simple, large-scale production management is facilitated, and efficient flotation recovery of the zinc resources can be achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of mineral processing engineering, and in particular relates to a slurry preparation and flotation method for gypsum-containing zinc oxide ore. Background Art

[0002] Zinc is an important raw material for national economic construction. It is widely used in construction, automobile, electromechanical, chemical, pharmaceutical, military and other fields due to its good wear resistance, corrosion resistance and ductility. Zinc-containing 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. With the increasing development of high-quality zinc sulfide resources, such resources have shown the characteristics of being poor, fine and mixed in recent years. Therefore, improving the efficient and clean recovery technology of zinc oxide resources is conducive to safeguarding the status of zinc resources in my country.

[0003] The material composition of zinc oxide ore is complex and may contain soluble salts such as gypsum, such as the super-large non-sulfide lead-zinc deposits such as Lanping Lead-Zinc Mine and Huoshaoyun Lead-Zinc Mine. The presence of soluble salts such as gypsum has an adverse effect on the flotation of zinc oxide minerals. The calcium ions produced by its dissolution act on the surface of zinc oxide minerals, affecting the sulfidation of sulfidizing agents and the adsorption of collectors. In addition, the carbonate ions produced by the dissolution of carbonate minerals in the ore and the addition of sodium carbonate as an adjusting agent may also react with calcium ions to form precipitation, covering the surface of zinc oxide minerals, hindering the action of sulfidizing agents, collectors and other agents, and affecting the efficient flotation recovery of zinc resources. Summary of the invention

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

[0005] The present invention provides a slurry preparation and flotation method for gypsum-containing zinc oxide ore, comprising the following steps:

[0006] S1. Crushing and grinding the raw ore to obtain a grinding product;

[0007] S2. The grinding product obtained in step S1 is added with a polymer calcium ion chelating agent and then slurried to obtain a slurry product 1;

[0008] S3. The slurry product 1 obtained in step S2 is slurried by adding sodium carbonate to obtain a slurry product 2;

[0009] S4. The slurry product 2 obtained in step S3 is slurried by adding sodium sulfide to obtain a slurry product 3;

[0010] S5. After adding a collector to the slurry product 3 obtained in step S4, the mixture is stirred and aerated to carry out zinc oxide flotation to obtain zinc oxide concentrate and tailings.

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

[0012] The g / t mentioned in the technical solution of the present invention is based on the mass of the original ore.

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

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

[0015] Furthermore, in step S4, the amount of sodium sulfide added is 10000-40000 g / t; and the slurry preparation process conditions after adding sodium sulfide are: stirring for 5-20 min.

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

[0017] Principle of the present invention:

[0018] The raw ore targeted by the present invention is a gypsum-containing zinc oxide ore. During the grinding and flotation slurry adjustment process, calcium ions generated by the dissolution of gypsum act on the surface of the zinc oxide mineral. After a high-molecular calcium ion chelating agent is added, calcium ions on the mineral surface are desorbed from the mineral surface under the action of the chelating agent. After the adjustment agent sodium carbonate is added, carbonate radicals react with calcium ions to generate calcium carbonate precipitation. At the same time, calcium carbonate crystals flocculate under the action of the high-molecular chelating agent, thereby effectively reducing its influence on the surface of the zinc oxide mineral.

[0019] Beneficial effects of the present invention:

[0020] The method of the present invention has strong adaptability to zinc oxide ores containing gypsum, can reduce the adsorption of calcium ions dissolved in gypsum on the surface of zinc oxide minerals such as smithsonite, effectively reduce the generation of calcium carbonate on the surface of the mineral, further improve the surface sulfidation efficiency of sodium sulfide, and help to achieve efficient flotation recovery of zinc oxide minerals by sulfidation amine method;

[0021] The method of the invention has a simple process flow, is easy for industrial production, has good adaptability to gypsum-containing zinc oxide ore, and can obtain better zinc oxide flotation indicators. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The figure is a schematic diagram of the process of the present invention. DETAILED DESCRIPTION

[0023] In order to make the purpose, application method and beneficial effects of the present invention clearer, the embodiments of the present invention will be described in detail below to facilitate the understanding of technicians.

[0024] Example 1

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

[0026] 1) The raw ore is crushed and ground, and the -0.074 mm particle size accounts for 75% of the ground product;

[0027] 2) Adding a high molecular calcium ion chelating agent gum arabic to the ground product obtained in step 1) in an amount of 100 g / t based on the mass of the original ore, and stirring for 3 minutes;

[0028] 3) adding sodium carbonate to the slurry product obtained in step 2) in an amount of 1000 g / t based on the mass of the original ore, and stirring for 3 minutes;

[0029] 4) adding sodium sulfide to the slurry product obtained in step 3), wherein the amount of sodium sulfide added is 10000 g / t based on the mass of the original ore, and stirring for 20 minutes after adding the sodium sulfide;

[0030] 5) Adding the collector dodecylamine to the slurry product obtained in step 4), the amount of the collector added is 100 g / t based on the mass of the original ore, and zinc oxide flotation is performed after stirring and aeration, the flotation time is 5 min, and zinc oxide concentrate and zinc oxide tailings are obtained. The test results are shown in Table 1.

[0031] Comparative Example 1

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

[0033] Comparative Example 2

[0034] The other conditions are consistent with those in Example 1, except that the adjusting agent sodium carbonate is not added. The test results are shown in Table 1.

[0035] Comparative Example 3

[0036] The other conditions were consistent with those in Example 1, except that the adjusting agent sodium carbonate was added first and the high molecular calcium ion chelating agent gum arabic was added later. The test results are shown in Table 1.

[0037] Table 1 Flotation test results / %

[0038]

[0039] Example 2

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

[0041] 1) The raw ore is crushed and ground, and the -0.074mm particle size accounts for 90% of the ground product;

[0042] 2) Adding the high molecular calcium ion chelating agent gum arabic and gelatin (mass ratio 1:1) to the ground product obtained in step 1), with a total amount of 500 g / t based on the mass of the original ore, and stirring for 3 minutes;

[0043] 3) adding sodium carbonate to the slurry product obtained in step 2) in an amount of 5000 g / t based on the mass of the original ore, and stirring for 3 minutes;

[0044] 4) adding sodium sulfide to the slurry product obtained in step 3), wherein the amount of sodium sulfide added is 40000 g / t based on the mass of the original ore, and stirring for 5 minutes after adding the sodium sulfide;

[0045] 5) Adding the collector dodecylamine to the slurry product obtained in step 4), the amount of the collector added is 200 g / t based on the mass of the original ore, and zinc oxide flotation is performed after stirring and aeration, the flotation time is 5 min, and zinc oxide concentrate and zinc oxide tailings are obtained. The test results are shown in Table 2.

[0046] Comparative Example 4

[0047] The other conditions were the same as those in Example 2, except that the macromolecular calcium ion chelating agent gum arabic and gelatin were not added. The test results are shown in Table 2.

[0048] Comparative Example 5

[0049] The other conditions are consistent with those of Example 2, except that the adjusting agent sodium carbonate is not added. The test results are shown in Table 2.

[0050] Comparative Example 6

[0051] The other conditions were consistent with those of Implementation 2, except that the adjusting agent sodium carbonate was added first, and the high molecular calcium ion chelating agent gum arabic and gelatin were added later. The test results are shown in Table 2.

[0052] Table 2 Flotation test results / %

[0053]

[0054]

[0055] Example 3

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

[0057] 1) The raw ore is crushed and ground, and the -0.074 mm particle size accounts for 85% of the ground product;

[0058] 2) Adding the high molecular calcium ion chelating agent gum arabic, gelatin and carboxymethyl cellulose (mass ratio 1:1:1) to the ground ore product obtained in step 1), with a total amount of 300 g / t based on the mass of the original ore, and stirring for 3 minutes;

[0059] 3) adding sodium carbonate to the slurry product obtained in step 2) in an amount of 3000 g / t based on the mass of the original ore, and stirring for 3 minutes;

[0060] 4) adding sodium sulfide to the slurry product obtained in step 3), wherein the amount of sodium sulfide added is 25000 g / t based on the mass of the original ore, and stirring for 15 minutes after adding the sodium sulfide;

[0061] 5) Adding the collector dodecylamine to the slurry product obtained in step 4), the amount of the collector added is 250 g / t based on the mass of the original ore, and zinc oxide flotation is performed after stirring and aeration, the flotation time is 6 min, and zinc oxide concentrate and zinc oxide tailings are obtained. The test results are shown in Table 3.

[0062] Comparative Example 7

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

[0064] Comparative Example 8

[0065] The other conditions are consistent with those of Example 3, except that the adjusting agent sodium carbonate is not added. The test results are shown in Table 3.

[0066] Comparative Example 9

[0067] The other conditions were consistent with those of Implementation 3, except that the adjusting agent sodium carbonate was added first, and the high molecular calcium ion chelating agent gum arabic and gelatin were added later. The test results are shown in Table 3.

[0068] Table 3 Flotation test results / %

[0069]

[0070] In summary, it can be seen that it is difficult to obtain better flotation indicators without either the polymer calcium ion chelating agent or sodium carbonate. At the same time, the order of adding the polymer calcium ion chelating agent and sodium carbonate cannot be reversed, otherwise it is difficult to exert a beneficial effect. The two have different mechanisms of influence on the inevitable ion migration on the mineral surface. The calcium ions dissolved in gypsum are acted on by the polymer chelating agent and desorbed from the surface of the zinc oxide mineral. Only then can sodium carbonate show its regulating effect on the slurry.

Claims

1. A slurry preparation and flotation method for gypsum-containing zinc oxide ore, characterized in that: The following steps are involved: S1. Crushing and grinding the raw ore to obtain a grinding product; S2. The grinding product obtained in step S1 is added with a polymer calcium ion chelating agent and then slurried to obtain a slurry product 1; S3. The slurry product 1 obtained in step S2 is slurried by adding sodium carbonate to obtain a slurry product 2; S4. The slurry product 2 obtained in step S3 is slurried by adding sodium sulfide to obtain a slurry product 3; S5. After adding a collector to the slurry product 3 obtained in step S4, the mixture is stirred and aerated to carry out zinc oxide flotation to obtain zinc oxide concentrate and tailings.

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

3. The slurry preparation and flotation method of gypsum-containing zinc oxide ore according to claim 1, characterized in that: In step S2, the polymer calcium ion chelating agent is at least one of gum arabic, gelatin, and carboxymethyl cellulose.

4. The slurry preparation and flotation method of gypsum-containing zinc oxide ore according to claim 3, characterized in that: In step S2, the addition amount of the polymer calcium ion chelating agent is 100 to 500 g / t.

5. The slurry preparation and flotation method of gypsum-containing zinc oxide ore according to claim 1, characterized in that: In step S3, the amount of sodium carbonate added is 1000-5000 g / t.

6. The slurry preparation and flotation method of gypsum-containing zinc oxide ore according to claim 1, characterized in that: In step S4, the amount of sodium sulfide added is 10000-40000 g / t; the slurry preparation process conditions after adding sodium sulfide are: stirring for 5-20 min.

7. The slurry preparation and flotation method of 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.

8. The slurry preparation and flotation method of gypsum-containing zinc oxide ore according to claim 7, characterized in that: The added amount of the collector is 50 to 400 g / t.

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