A kind of iron ore reverse flotation inhibitor and its preparation method

Abstract

The present invention relates to an iron ore reverse flotation inhibitor and a preparation method thereof. In the first step, a mixture of the following components by weight is reacted at 40°C to 50°C for 1 to 6 hours to obtain an auxiliary agent (1): 100 parts of corn starch, mung bean starch, or potato starch, 0.5 to 4.0 parts of sodium hydroxide or sodium ethoxide, 5 to 15 parts of methyl chloroacetate, and 5 to 15 parts of hydroxylamine hydrochloride or hydroxylamine sulfate. In the second step, a mixture of the following components by weight is reacted at 20°C to 50°C for 1 to 3 hours to obtain a finished inhibitor: 100 parts of the auxiliary agent (1) obtained in the first step and 1 to 12 parts of sodium hypochlorite. The inhibitor has strong inhibitory ability, selectivity, and low-temperature adaptability and can be used for room-temperature flotation.

Description

Technical Field

[0001] The invention relates to an iron ore reverse flotation inhibitor and a preparation method thereof, belonging to the technical field of mineral processing agents. Background Art

[0002] Under high-temperature conditions, iron ore reverse flotation depressants can be broadly categorized into three main groups: starch, cellulose, and others. These differing properties allow them to be used for the separation of different types of iron ore. Starch is a traditional depressant for hematite. As a polysaccharide-based organic polymer, starch is widely available, inexpensive to produce, and produces minimal pollution. Starch molecules contain numerous -OH and -O- hydrophilic groups, which exert an inhibitory effect on iron ore flotation. Cellulose, with carboxymethyl cellulose being a typical example, has a comparable inhibitory effect on calcium-activated hematite as starch, but has a wider pH range and more flexible application conditions than starch. Other depressants primarily include water glass, humic acid, waste brewer's yeast solution, DX-1, and FS. Currently, these depressants achieve excellent results under high-temperature flotation conditions, while iron ore flotation requires room temperature. Due to the low winter temperatures in northern China, conventional iron ore depressants struggle to achieve acceptable iron concentrate grades, necessitating an urgent need for depressants suitable for low-temperature flotation. Summary of the Invention

[0003] The purpose of the present invention is to provide an iron mineral reverse flotation inhibitor and a preparation method thereof. The inhibitor integrates a hydroxyl group, a hydroxamic acid group, a carboxyl group and an ether bond. In particular, the hydroxamic acid can form a chelate complex with iron, and the four groups synergistically enhance the binding force and selectivity of the inhibitor to the surface of the iron mineral, thereby improving the grade and recovery rate of the iron concentrate and reducing the iron grade in the tailings.

[0004] The purpose of the present invention is achieved through the following technical solutions:

[0005] The present invention provides a method for preparing an iron ore reverse flotation inhibitor, comprising the following steps:

[0006] In the first step, a mixture of the following components in parts by weight is reacted at 40° C. to 50° C. for 1 to 6 hours to obtain a high-efficiency additive 1:

[0007]

[0008]

[0009] In the second step, a mixture of the following components in parts by weight is reacted at 20° C. to 50° C. for 1 to 3 hours to obtain a finished inhibitor:

[0010] 1 100 parts of the high-efficiency auxiliary agent obtained in the first step above 1-12 parts sodium hypochlorite The starch is corn starch, mung bean starch or potato starch.

[0011] Iron mineral reverse flotation inhibitors with different properties can be obtained by selecting different preparation methods.

[0012] Furthermore, in the above technical solution, a method for preparing an iron mineral reverse flotation inhibitor preferably comprises the following steps:

[0013] In the first step, a mixture of the following components in parts by weight is reacted at 40°C to 50°C for 4 hours to obtain a high-efficiency additive 1:

[0014]

[0015] In the second step, a mixture of the following components in parts by weight is reacted at 30° C. to 40° C. for 2 to 3 hours to obtain a finished inhibitor:

[0016] 1 100 parts of the high-efficiency auxiliary agent obtained in the first step above 3-5 parts sodium hypochlorite

[0017] Furthermore, in the above technical solution, a method for preparing an iron mineral reverse flotation inhibitor preferably comprises the following steps:

[0018] In the first step, a mixture of the following components in parts by weight is reacted at 45°C to 50°C for 4 hours to obtain a high-efficiency additive 1:

[0019]

[0020] In the second step, a mixture of the following components in parts by weight is reacted at 30° C. to 32° C. for 2 to 3 hours to obtain a finished inhibitor:

[0021] 1 100 parts of the high-efficiency auxiliary agent obtained in the first step above 2-10 parts sodium hypochlorite

[0022] Furthermore, in the above technical solution, a method for preparing an iron mineral reverse flotation inhibitor preferably comprises the following steps:

[0023] In the first step, a mixture of the following components in parts by weight is reacted at 48°C to 50°C for 4 hours to obtain a high-efficiency additive 1:

[0024]

[0025] In the second step, a mixture of the following components in parts by weight is reacted at 30° C. to 32° C. for 2 to 3 hours to obtain a finished inhibitor:

[0026] 1 100 parts of the high-efficiency auxiliary agent obtained in the second step above 1-10 parts sodium hypochlorite

[0027] When testing the performance of the iron ore reverse flotation inhibitor of the present invention, the mass percentage of the NaOH aqueous solution is 5%; the mass percentage of the iron ore reverse flotation inhibitor aqueous solution is 2%; the mass percentage of the calcium oxide aqueous solution is 2%; and the mass percentage of the collector aqueous solution is 2%. The flotation process is "one coarse, one fine, and three sweeps."

[0028] The present invention provides an iron ore reverse flotation inhibitor obtained by the above preparation method.

[0029] Advantageous Effects of the Invention

[0030] The present invention forms an iron mineral inhibitor containing functional groups such as hydroxyl, hydroxamic acid, carboxyl, and ether bonds on starch molecules through a two-step reaction, capable of inhibiting a wide range of iron minerals. The hydroxyl, hydroxamic acid, carboxyl, and ether bonds enhance the effective interaction with the iron mineral surface. In particular, hydroxamic acid can form a highly stable chelate with iron ions on the surface of the iron mineral, improving the inhibitor's selectivity and ultimately increasing the iron grade of iron concentrate and resource utilization. DETAILED DESCRIPTION

[0031] The following non-limiting examples may enable those skilled in the art to more fully understand the present invention, but are not intended to limit the present invention in any way.

[0032] Example 1

[0033] In the first step, a mixture of the following components in parts by weight is reacted at 40°C to 45°C for 4 hours to obtain a high-efficiency additive 1:

[0034]

[0035] In the second step, a mixture of the following components in parts by weight is reacted at 36° C. to 38° C. for 2 to 3 hours to obtain a finished inhibitor:

[0036] 1 100 parts of the high-efficiency auxiliary agent obtained in the first step above 4 parts sodium hypochlorite Product performance: Compared with the causticized corn starch inhibitor used by Diaojuntai Industry, the flotation temperature of iron ore is reduced by 15℃, the grade of iron concentrate is increased by 0.4%, the iron grade of tailings is reduced by 2.1%, and the unit consumption of reagents is increased by 8.2%.

[0037] Example 2

[0038] In the first step, a mixture of the following components in parts by weight is reacted at 45°C to 50°C for 4 hours to obtain a high-efficiency additive 1:

[0039]

[0040] In the second step, a mixture of the following components in parts by weight is reacted at 30° C. to 36° C. for 2 to 3 hours to obtain a finished inhibitor:

[0041] 1 100 parts of the high-efficiency auxiliary agent obtained in the first step above 3 parts sodium hypochlorite

[0042] Product performance: Compared with the causticized corn starch inhibitor used by Diaojuntai Industry, the flotation temperature of iron ore is reduced by 15℃, the grade of iron concentrate is increased by 0.3%, the iron grade of tailings is reduced by 2.2%, and the unit consumption of reagents is increased by 8.2%.

[0043] Example 3

[0044] In the first step, a mixture of the following components in parts by weight is reacted at 45°C to 47°C for 4 hours to obtain a high-efficiency additive 1:

[0045]

[0046] In the second step, a mixture of the following components in parts by weight is reacted at 30° C. to 32° C. for 2 to 3 hours to obtain a finished inhibitor:

[0047] 1 100 parts of the high-efficiency auxiliary agent obtained in the first step above 5 parts of sodium hypochlorite

[0048] Product performance: Compared with the causticized corn starch inhibitor used by Diaojuntai Industry, the flotation temperature of iron ore is reduced by 16°C, the grade of iron concentrate is increased by 0.34%, the iron grade of tailings is reduced by 2.18%, and the unit consumption of reagents is increased by 9.2%.

[0049] Example 4

[0050] In the first step, a mixture of the following components in parts by weight is reacted at 48°C to 50°C for 4 hours to obtain a high-efficiency additive 1:

[0051]

[0052] In the second step, a mixture of the following components in parts by weight is reacted at 30° C. to 32° C. for 2 to 3 hours to obtain a finished inhibitor:

[0053] 1 100 parts of the high-efficiency auxiliary agent obtained in the first step above 8 parts of sodium hypochlorite

[0054] Product performance: Compared with the causticized corn starch inhibitor used by Diaojuntai Industry, the flotation temperature of iron ore is reduced by 16°C, the grade of iron concentrate is increased by 0.24%, the iron grade of tailings is reduced by 2.31%, and the unit consumption of reagents is increased by 9.2%.

[0055] Example 5

[0056] In the first step, a mixture of the following components in parts by weight is reacted at 48°C to 50°C for 4 hours to obtain a high-efficiency additive 1:

[0057]

[0058]

[0059] In the second step, a mixture of the following components in parts by weight is reacted at 30° C. to 32° C. for 2 to 3 hours to obtain a finished inhibitor:

[0060] 1 100 parts of the high-efficiency auxiliary agent obtained in the second step above 4 parts sodium hypochlorite

[0061] Product performance: Compared with the causticized corn starch inhibitor used by Diaojuntai Industry, the flotation temperature of iron ore is reduced by 20℃, the grade of iron concentrate is increased by 0.12%, the iron grade of tailings is reduced by 2.23%, and the unit consumption of reagents is increased by 11.2%.

[0062] Example 6

[0063] In the first step, a mixture of the following components in parts by weight is reacted at 48°C to 50°C for 4 hours to obtain a high-efficiency additive 1:

[0064]

[0065] In the second step, a mixture of the following components in parts by weight is reacted at 30° C. to 32° C. for 2 to 3 hours to obtain a finished inhibitor:

[0066] 1 100 parts of the high-efficiency auxiliary agent obtained in the second step above 5 parts of sodium hypochlorite

[0067] Product performance: Compared with the causticized corn starch inhibitor used by Diaojuntai Industry, the flotation temperature of iron ore is reduced by 20℃, the grade of iron concentrate is increased by 0.15%, the iron grade of tailings is reduced by 2.01%, and the unit consumption of reagents is increased by 12.1%.

Claims

1. A method for preparing an iron ore reverse flotation inhibitor, characterized in that The steps include: In the first step, a mixture of the following components in parts by weight is reacted at 40° C. to 50° C. for 1 to 6 hours to obtain a high-efficiency additive 1: In the second step, a mixture of the following components in parts by weight is reacted at 20° C. to 50° C. for 1 to 3 hours to obtain a finished inhibitor: The high-efficiency auxiliary agent obtained in the first step is 1:100 parts of sodium hypochlorite and 1-12 parts of the starch selected from the group consisting of corn starch, mung bean starch and potato starch.

2. The method for preparing an iron ore reverse flotation inhibitor according to claim 1, wherein: In the first step, a mixture of the following components in parts by weight is reacted at 40° C. to 50° C. for 4 hours to obtain a high-efficiency additive 1: In the second step, a mixture of the following components in parts by weight is reacted at 30° C. to 40° C. for 2 to 3 hours to obtain a finished inhibitor: 3-5 parts of the high-efficiency auxiliary agent obtained in the first step above: 1100 parts of sodium hypochlorite.

3. The method for preparing an iron ore reverse flotation inhibitor according to claim 1, wherein: In the first step, a mixture of the following components in parts by weight is reacted at 45° C. to 50° C. for 4 hours to obtain a high-efficiency additive 1: In the second step, a mixture of the following components in parts by weight is reacted at 30° C. to 32° C. for 2 to 3 hours to obtain a finished inhibitor: 2 to 10 parts of sodium hypochlorite per 100 parts of the high-efficiency auxiliary agent obtained in the first step above.

4. The method for preparing an iron ore reverse flotation inhibitor according to claim 1, wherein: In the first step, a mixture of the following components in parts by weight is reacted at 48° C. to 50° C. for 4 hours to obtain a high-efficiency additive 1: In the second step, a mixture of the following components in parts by weight is reacted at 30° C. to 32° C. for 2 to 3 hours to obtain a finished inhibitor: 1-10 parts of the high-efficiency auxiliary agent obtained in the first step above: 1100 parts of sodium hypochlorite.

5. The iron mineral reverse flotation inhibitor obtained by the preparation method of the iron mineral reverse flotation inhibitor according to any one of claims 1 to 4.

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