Hematite normal-temperature reverse flotation desilicication method

Abstract

The invention relates to a normal-temperature reverse flotation desilicication method for hematite, in particular to a flotation separation method for hematite and quartz, and belongs to the technical field of mineral flotation separation in the field of mineral processing engineering. A hematite normal-temperature reverse flotation desilicication method comprises the following steps: mixing an ore sample to be treated with water according to a mass ratio, and carrying out size mixing and stirring until the pH value is 10-12; adding an activating agent calcium chloride, and stirring; then adding an inhibitor soluble starch, and stirring; and finally, a collecting agent N-sodium lauroyl sarcosinate is added, flotation is conducted after stirring, and hematite concentrate is obtained. The method disclosed by the invention is simple in process flow, simple in reagent system (without adding a foaming agent), convenient to operate and capable of realizing normal-temperature flotation, and has a relatively good industrial feasibility prospect.

Description

Technical Field

[0001] The invention relates to a normal-temperature reverse flotation desiliconization method for hematite, in particular to a flotation separation method for hematite and quartz, and belongs to the technical field of mineral flotation separation in the field of mineral processing engineering. Background Art

[0002] The steel industry is a basic industry of the national economy, which directly determines the industrialization foundation of the entire country. Even in countries that have already achieved industrialization, the steel industry is irreplaceable. The steel industry is one of the indispensable pillar industries for promoting the economic development of our country. Nowadays, with the rapid development of science and technology industry, the demand for steel is getting higher and higher, which has led to a sharp increase in the pressure of steel production in our country. The entire steel industry will face huge challenges. Iron is called "the food of industry" and is one of the most used metal materials. It has high strength, rich resources and good mechanical properties, which directly determines whether our country's industrial economy can develop rapidly and stably. Therefore, strengthening the development and utilization of iron resources is of great significance to supporting the sustainable development of our country's economy.

[0003] Hematite is a type of iron ore, the main component of which is ferric oxide. Its unique physical and chemical properties make it occupy an important position in steel production. China is one of the world's largest producers and exporters of hematite. It has rich reserves of hematite resources, but most of them are low-grade ores with fine embedded particles and complex mineral composition. They are mostly paragenetic ores with many types. With the continuous development and utilization of iron ore resources, the grade of ore mining is getting lower and lower, and the embedded particle size of minerals is getting finer and finer. At present, hematite flotation collectors have problems such as weak collection ability, poor selectivity, and low temperature resistance. Therefore, the exploration of new hematite purification methods and the improvement of hematite recovery rate and grade are of great significance to the efficient utilization of my country's iron resources. Summary of the invention

[0004] Aiming at the problem that the defects of collectors in the existing hematite flotation technology lead to low ore grade, the present invention provides a method for desiliconization of hematite at room temperature by reverse flotation. The main purpose is to achieve effective separation of minerals by selecting a new collector, according to the low temperature resistance of the new collector and the different flotation behaviors of hematite and gangue mineral quartz. The method has a simple process flow, a simple reagent system, and can achieve the purpose of efficient desiliconization.

[0005] A method for desiliconization of hematite by reverse flotation at room temperature comprises the following steps: mixing a ore sample to be treated with water according to a mass ratio, slurrying and stirring to make the pH value of the ore sample to be treated be 10-12; then adding an activator, calcium chloride, and stirring; then adding an inhibitor, soluble starch, and stirring; finally adding a collector, sodium N-lauroyl sarcosinate, and flotation is performed after stirring to obtain a hematite concentrate.

[0006] Furthermore, a method for desiliconization of hematite by reverse flotation at room temperature includes the following process steps: mixing the ore sample to be treated with water in a mass ratio, slurrying and stirring for 1 to 3 minutes to obtain a slurry with a pH of 10 to 12; then adding an activator calcium chloride to the slurry obtained above and stirring for 2 minutes; then adding an inhibitor soluble starch and stirring for 2 minutes; finally adding a collector sodium N-lauroyl sarcosinate, stirring for 2 minutes and then flotation, the flotation time is 3 minutes, to obtain a hematite concentrate.

[0007] In the method of the present invention, the ore sample to be processed can be a natural mineral obtained from nature, or can be an artificial mixed ore.

[0008] Preferably, the ore sample to be processed is an artificial mixed ore of hematite and quartz.

[0009] Further preferably, the mass ratio of hematite to quartz in the artificial mixed ore is 3:2.

[0010] In the method of the present invention, optionally, a pH adjuster is added to the slurry obtained after slurry mixing and stirring to adjust the pH value thereof to 10 to 12, and then the slurry mixing and stirring is performed for 1 to 3 minutes.

[0011] Furthermore, the step of adding a pH adjuster to the slurry obtained after slurry mixing and stirring to adjust the pH is determined according to the pH of the slurry obtained after the ore sample to be treated is mixed with water. If the pH of the slurry obtained after the ore sample to be treated is mixed with water is in the range of 10 to 12, this step is not required; if it is not in the range of 10 to 12, this step is required.

[0012] Furthermore, the pH adjuster is a NaOH solution, and there is no special requirement for the NaOH solution.

[0013] In the method of the present invention, the mass ratio of the mineral sample to water is 1:6-8.

[0014] In the method of the present invention, the amount of calcium chloride added is 20-40 mg / L.

[0015] Furthermore, the 20-40 mg / L refers to 20-40 mg of calcium chloride used for every 1 L of slurry to be treated.

[0016] In the method of the present invention, the amount of soluble starch added is 4-5 mg / L.

[0017] Furthermore, the 4-5 mg / L refers to 4-5 mg of soluble starch solution used for every 1 L of slurry to be treated.

[0018] In the method of the present invention, the added amount of sodium N-lauroyl sarcosinate is 25-50 mg / L.

[0019] Furthermore, the 25-50 mg / L means that the amount of collector used per 1L of slurry to be treated is 25-50 mg.

[0020] Furthermore, the calcium chloride, soluble starch and sodium N-lauroyl sarcosinate are all added in the form of aqueous solution.

[0021] Furthermore, the concentration of the calcium chloride solution is 3 g / L, the concentration of the soluble starch solution is 0.3 g / L, and the concentration of the sodium N-lauroyl sarcosinate solution is 3 g / L.

[0022] In the method of the present invention, the slurry mixing stirring rate is 1600-1992 r / min, and the stirring rate is 1600-1992 r / min.

[0023] In the method of the present invention, after flotation, the foam product is tailings and the product in the tank is hematite concentrate.

[0024] Beneficial effects of the present invention: The method for purifying hematite by reverse flotation from quartz proposed by the present invention has a simple process flow, a simple reagent system (no need to add a frother), is easy to operate, and has good industrial feasibility. Flotation separation can still be achieved under low temperature conditions, and the new collector has good water solubility. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a process flow chart of the method for purifying hematite from quartz by reverse flotation as described in Example 3. DETAILED DESCRIPTION

[0026] The following non-limiting embodiments may enable a person skilled in the art to more fully understand the present invention, but are not intended to limit the present invention in any way.

[0027] The test methods described in the following examples are conventional methods unless otherwise specified; the reagents and materials described are commercially available unless otherwise specified.

[0028] The particle size of the samples prepared from hematite and quartz in the following examples is -0.074 mm (ie, the particle size of the samples is below 0.074 mm), and the purity of hematite and quartz is 97% and 63%, respectively.

[0029] The XFGII hanging trough flotation machine used in the following examples was purchased from Jilin Province Prospecting Machinery Factory.

[0030] Example 1

[0031] A method for desiliconization of hematite by reverse flotation at room temperature, comprising the following process steps:

[0032] (1) Hematite and quartz are mixed into a mixed ore sample in a mass ratio of 3:2, 5 g of the ore sample is weighed and placed in a flotation tank and deionized water is added, wherein the mass ratio of deionized water to the ore sample is 7:1; a hanging tank flotation machine is used, and the slurry is stirred and adjusted for 2 minutes at 1992 r / min; the pH value is measured to be 7.34, and then a NaOH solution with a concentration of 1 mol / L is added to the slurry to adjust the pH value of the slurry to 11.94, and then the slurry is adjusted for another 2 minutes;

[0033] (2) After slurry adjustment, at room temperature of 28°C and a pulp pH of 11.94, add 3g / L of activator calcium chloride solution to 20mg / L in 35mL of pulp, stir for 2min, then add 0.3g / L of inhibitor soluble starch solution to 4mg / L; stir for 2min, add 3g / L of collector sodium N-lauroyl sarcosinate solution to 50mg / L, stir for 2min, and then flotation is performed for 3min. After flotation, the foam product, i.e., tailings, and the product in the tank, i.e., concentrate, are dried and weighed respectively, and samples are taken for testing and the recovery rate is calculated. The Fe2O3 grade in the flotation concentrate is 67.11% and the recovery rate can reach 97.33%.

[0034] Example 2

[0035] (1) Hematite and quartz are prepared into a mixed ore sample in a mass ratio of 3:2, 5 g of the ore sample is weighed and placed in a flotation tank and deionized water is added, wherein the mass ratio of deionized water to the ore sample is 7:1; a hanging tank flotation machine is used, and the slurry is stirred and adjusted for 2 minutes at 1992 r / min; the pH value is measured to be 7.34, and then a NaOH solution with a concentration of 1 mol / L is added to the slurry to adjust the pH value of the slurry to 11.94, and then the slurry is adjusted for another 2 minutes;

[0036] (2) After slurry adjustment, at room temperature of 28°C and a pulp pH of 11.94, add 3g / L of activator calcium chloride solution to 40mg / L in 35mL of pulp, stir for 2min, then add 0.3g / L of inhibitor soluble starch solution to 4mg / L; stir for 2min, add 3g / L of collector sodium N-lauroyl sarcosinate solution to 25mg / L, stir for 2min, and then flotation is performed for 3min. After flotation, the foam product, i.e., tailings, and the product in the tank, i.e., concentrate, are dried and weighed respectively, and samples are taken for testing and the recovery rate is calculated. The Fe2O3 grade in the flotation concentrate is 65.47% and the recovery rate can reach 94.42%.

[0037] Example 3

[0038] (1) Hematite and quartz are prepared into a mixed ore sample in a mass ratio of 3:2, 5 g of the ore sample is weighed and placed in a flotation tank and deionized water is added, wherein the mass ratio of deionized water to the ore sample is 7:1; a hanging tank flotation machine is used, and the slurry is stirred and adjusted for 2 minutes at 1992 r / min; the pH value is measured to be 7.34, and then a NaOH solution with a concentration of 1 mol / L is added to the slurry to adjust the pH value of the slurry to 11.94, and then the slurry is adjusted for another 2 minutes;

[0039] (2) After slurry adjustment, at room temperature of 28°C and a pulp pH of 11.94, add 3g / L of activator calcium chloride solution to 40mg / L in 35mL of pulp, stir for 2min, then add 0.3g / L of inhibitor soluble starch solution to 4mg / L; stir for 2min, add 3g / L of collector sodium N-lauroyl sarcosinate solution to 40mg / L, stir for 2min, and then flotation is performed for 3min. After flotation, the foam product, i.e., tailings, and the product in the tank, i.e., concentrate, are dried and weighed respectively, and samples are taken for testing and the recovery rate is calculated. The Fe2O3 grade in the flotation concentrate is 67.35% and the recovery rate can reach 83.76%.

[0040] Example 4

[0041] (1) Hematite and quartz are prepared into a mixed ore sample in a mass ratio of 3:2, 5 g of the ore sample is weighed and placed in a flotation tank and deionized water is added, wherein the mass ratio of deionized water to the ore sample is 7:1; a hanging tank flotation machine is used, and the slurry is stirred and adjusted for 2 minutes at 1992 r / min; the pH value is measured to be 7.34, and then a NaOH solution with a concentration of 1 mol / L is added to the slurry to adjust the pH value of the slurry to 11.94, and then the slurry is adjusted for another 2 minutes;

[0042] (2) After slurry adjustment, at room temperature of 28°C and a pulp pH of 11.94, add 3g / L of activator calcium chloride solution to 40mg / L in 35mL of pulp, stir for 2min, then add 0.3g / L of inhibitor soluble starch solution to 4mg / L; stir for 2min, add 3g / L of collector sodium N-lauroyl sarcosinate solution to 50mg / L, stir for 2min, and then flotation is performed for 3min. After flotation, the foam product, i.e., tailings, and the product in the tank, i.e., concentrate, are dried and weighed respectively, and samples are taken for testing and the recovery rate is calculated. The Fe2O3 grade in the flotation concentrate is 67.38% and the recovery rate can reach 82.54%.

[0043] Example 5

[0044] (1) Hematite and quartz are prepared into a mixed ore sample in a mass ratio of 3:2, 5 g of the ore sample is weighed and placed in a flotation tank and deionized water is added, wherein the mass ratio of deionized water to the ore sample is 7:1; a hanging tank flotation machine is used, and the slurry is stirred and adjusted for 2 minutes at 1992 r / min; the pH value is measured to be 7.34, and then a NaOH solution with a concentration of 1 mol / L is added to the slurry to adjust the pH value of the slurry to 11.94, and then the slurry is adjusted for another 2 minutes;

[0045] (2) After slurry adjustment, at room temperature of 28°C and a pulp pH of 11.94, add 3g / L of activator calcium chloride solution to 40mg / L in 35mL of pulp, stir for 2min, then add 0.3g / L of inhibitor soluble starch solution to 5mg / L; stir for 2min, add 3g / L of collector sodium N-lauroyl sarcosinate solution to 50mg / L, stir for 2min, and then flotation is performed for 3min. After flotation, the foam product, i.e., tailings, and the product in the tank, i.e., concentrate, are dried and weighed respectively, and samples are taken for testing and the recovery rate is calculated. The Fe2O3 grade in the flotation concentrate is 65.20% and the recovery rate can reach 89.84%.

Claims

1. A method for desiliconization of hematite by reverse flotation at room temperature, characterized in that: The ore sample to be treated is mixed with water according to the mass ratio, and the slurry is adjusted and stirred to make the pH value of 10-12; then the activator calcium chloride is added and stirred; then the inhibitor soluble starch is added and stirred; finally, the collector sodium N-lauroyl sarcosinate is added, and flotation is performed after stirring to obtain the hematite concentrate.

2. A method for desiliconization of hematite by reverse flotation at room temperature, characterized in that: The method comprises the following process steps: mixing a mineral sample to be treated with water according to a mass ratio, slurrying and stirring for 1 to 3 minutes to obtain a mineral pulp, and making the pH value of the mineral pulp be 10 to 12; then adding an activator calcium chloride to the mineral pulp obtained above, and stirring for 2 minutes; then adding an inhibitor soluble starch, and stirring for 2 minutes; finally adding a collector sodium N-lauroyl sarcosinate, stirring for 2 minutes, and performing flotation for 3 minutes to obtain a hematite concentrate.

3. The method according to claim 1 or 2, characterized in that: A pH adjuster is added to the slurry obtained after slurry mixing and stirring to adjust the pH value thereof to 10 to 12, and then the slurry is further mixed and stirred for 1 to 3 minutes.

4. The method according to claim 3, characterized in that: The pH adjuster is NaOH solution.

5. The method according to claim 1 or 2, characterized in that: The mass ratio of the ore sample to water is 1:6-8.

6. The method according to claim 1 or 2, characterized in that: The added amount of calcium chloride is 20-40 mg / L; the added amount of soluble starch is 4-5 mg / L; and the added amount of sodium N-lauroyl sarcosinate is 25-50 mg / L.

7. The method according to claim 1 or 2, characterized in that: The slurry mixing stirring rate is 1600-1992 r / min, and the stirring rate is 1600-1992 r / min.

8. The method according to claim 1 or 2, characterized in that: The ore sample to be processed is an artificial mixed ore of hematite and quartz, and the mass ratio of hematite to quartz is 3:2.

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