Iron ore room temperature flotation collector and application thereof

Abstract

This invention relates to a room-temperature flotation collector for iron ore and its application. The collector's structure is an organic ester-based carboxylic acid compound. Preparation method: The molar ratio of carboxylic acid to triphosgene is 1:0.4–0.8, the reaction temperature is 50℃–80℃, DMF catalyst is added dropwise, and the reaction time is 1h–3h. The molar ratio of acyl chloride to α-hydroxy acid is 1:0.8–1.0, the reaction temperature is 40℃–100℃, and the reaction time is 2h–5h, yielding the room-temperature flotation collector for iron ore. This invention's organic ester-based carboxylic acid compound can be mixed with fatty acids to serve as a room-temperature flotation collector for iron ore. The collector can improve the grade of iron concentrate and reduce the grade of iron tailings in room-temperature flotation.

Description

Technical Field

[0001] This invention relates to a room temperature flotation collector for iron ore and its application, belonging to the field of mineral processing reagents technology. Background Technology

[0002] Traditional high-temperature flotation using steam-heated ore slurry has been phased out due to its high carbon emissions and pollutants. Room temperature flotation is the goal of green, low-carbon, and high-quality development for mineral processing enterprises, and novel room temperature flotation collectors are crucial. Belt roasting pelletizing technology requires low-silica, high-quality iron concentrate, which can only be obtained through advanced iron ore flotation technology. Currently, the main components of collectors used in iron ore flotation are compounds such as oxidized paraffin soaps, oleic acid, fatty acids, and modified fatty acids. These compounds have high melting points, and when used as collectors for iron ore flotation at low flotation temperatures, they suffer from low solubility and poor selectivity. The insoluble portions cannot fully react with the minerals, resulting in insufficient collecting capacity and the tendency for "dropping" during scavenging. All of these factors contribute to low iron concentrate grades and high tailings grades. Therefore, it is imperative to invent and synthesize a collector with strong collecting capacity and high selectivity for room temperature iron ore flotation in winter. Summary of the Invention

[0003] The purpose of this invention is to provide a room temperature flotation collector for iron ore and its application. During low temperature flotation, the collector molecules have strong collecting ability and high selectivity for the target mineral.

[0004] This invention provides an iron ore room temperature flotation collector and its application. The collector contains an iron ore room temperature flotation collector with the structural formula R1-COO-CH(R2)COOM, where R1 is C 8-18 Hydrocarbon group, R2 is CH3 or CH2COOM, M is Na + or K + One of them.

[0005] Another aspect of the present invention provides a method for preparing a room temperature flotation collector for iron ore, the method comprising the following steps:

[0006] (1) Using carboxylic acids as raw materials, react with triphosgene to generate acyl chlorides with the structure shown in formula R1-COCl;

[0007] (2) Acyl chloride reacts with α-hydroxy acid to generate an iron ore room temperature flotation collector with the structure shown in formula R1-COO-CH(R2)COOM.

[0008] In the above technical solution, further, in step (1), the molar ratio of carboxylic acid to triphosgene is 1:0.4 to 0.8, the reaction temperature is 50℃ to 80℃, DMF catalyst is added dropwise, and the reaction time is 1h to 3h.

[0009] In the above technical solution, further, in step (2), the molar ratio of acyl chloride to α-hydroxy acid is 1:0.8 to 1.0, the reaction temperature is 40℃ to 100℃, and the reaction time is 2h to 5h.

[0010] The acyl chloride is oleic acid acyl chloride or lauroyl chloride.

[0011] The α-hydroxy acid mentioned is lactic acid or malic acid.

[0012] The room temperature refers to a slurry temperature of 5℃ to 40℃, and the low temperature refers to a slurry temperature of 5℃ to 15℃.

[0013] The iron ore room temperature flotation collector can be used alone or in combination with fatty acid collectors.

[0014] The beneficial effects of this invention are as follows: The method for preparing organic ester carboxylic acid compounds provided by this invention is simple and the raw materials are widely available. The prepared organic ester carboxylic acid compounds exhibit strong surface interaction with the target minerals during room temperature flotation, resulting in good selectivity and low dosage. This overcomes the shortcomings of traditional collectors, such as high flotation temperatures, weak collection capacity in low-temperature flotation, poor separation, and large dosage requirements, providing a new approach to improving my country's iron ore self-sufficiency rate and iron concentrate grade. Detailed Implementation

[0015] The present invention will be further described below with reference to specific embodiments, but this does not limit the present invention in any way.

[0016] Example 1

[0017] In a reaction vessel, 0.1 mol of oleic acid and 0.05 mol of triphosgene were added separately. The mixture was heated to 65°C with stirring to dissolve the oleic acid. 0.05 mol of DMF was slowly added dropwise. After the addition was complete, the reaction was carried out for 1 hour. The mixture was then separated; the upper layer was oleic acid chloride. In another reaction vessel, 0.1 mol of lactic acid and 45 ml of pyridine were added separately. 0.1 mol of oleic acid chloride was added dropwise with stirring. The mixture was heated to 45°C and reacted for 4 hours. Then, 30 ml of 4 mol / L NaOH solution was added, and stirring was continued for 2 hours. A colorless, clear solution was obtained, which was C8H4N2. 17 CH=CHC7H 14 COOCH(CH3)COONa collector.

[0018] Product performance:

[0019] (1) The laboratory used a flotation process with one rougher, one cleaner and three sweepers to evaluate the reagents. Under the condition that the mineral processing index is qualified, compared with the iron ore collector used by Guanbaoshan Industry, the flotation temperature is 20℃, the iron concentrate grade is increased by 0.32%, the tailings iron grade is decreased by 0.62%, and the reagent consumption is reduced by 10.00%.

[0020] (2) The laboratory used a flotation process of roughing, cleaning and scavenging to evaluate the reagents. Under the condition that the mineral processing indicators are qualified, compared with the iron ore collector used in Baogang mineral processing plant, the flotation temperature is 25℃, the iron concentrate grade increases by 0.05%, the tailings iron grade decreases by 0.40%, and the reagent consumption decreases by 2.00%.

[0021] Example 2

[0022] In a reaction vessel, 0.1 mol of lauric acid and 0.05 mol of triphosgene were added separately. The mixture was heated to 60°C with stirring to dissolve them. 0.05 mol of DMF was then slowly added dropwise. After the addition was complete, the reaction proceeded for 2 hours, and the upper layer was lauricyl chloride. In another reaction vessel, 0.1 mol of lactic acid and 45 ml of pyridine were added separately. 0.1 mol of lauricyl chloride was then added dropwise with stirring. The mixture was heated to 50°C and reacted for 3 hours. Then, 30 ml of 4 mol / L NaOH solution was added, and stirring continued for 2 hours, yielding a colorless and clear solution, which is C. 11 H 23 COOCH(CH3)COONa collector.

[0023] Product performance:

[0024] (1) The laboratory used a flotation process with one rougher, one cleaner, and three sweepers to evaluate the reagents. Under the condition that the mineral processing indicators are qualified, compared with the iron ore collector used by Guanbaoshan Industrial, the iron concentrate grade increased by 0.10% and the tailings iron grade decreased by 0.21% at a flotation temperature of 15℃, while the reagent consumption was the same.

[0025] (2) The laboratory used a flotation process of roughing, cleaning and scavenging to evaluate the reagents. Under the condition that the mineral processing indicators are qualified, compared with the iron ore collector used in Baogang mineral processing plant, the iron concentrate grade increased by 0.13% and the tailings iron grade decreased by 0.19% at a flotation temperature of 30℃, while the reagent consumption was the same.

[0026] Example 3

[0027] In a reaction vessel, 0.1 mol of oleic acid and 0.05 mol of triphosgene were added and heated to 70°C with stirring to dissolve them. 0.05 mol of DMF was then slowly added dropwise. After the addition was complete, the reaction proceeded for 1 hour, and the upper layer was oleic acid chloride. In another reaction vessel, 0.1 mol of malic acid and 45 ml of pyridine were added and 0.1 mol of oleic acid chloride was added dropwise with stirring. The mixture was heated to 100°C and reacted for 3 hours. Then, 30 ml of 4 mol / L NaOH solution was added, and stirring continued for 2 hours, yielding a colorless and clear solution, which is C8H4O3. 17 CH=CHC7H 14 COOCH(CH2COONa)COONa collector.

[0028] Product performance:

[0029] (1) The laboratory used a flotation process with one rougher, one cleaner and three sweepers to evaluate the reagents. Under the condition that the mineral processing index is qualified, compared with the iron ore collector used by Guanbaoshan Industrial, the flotation temperature is 20℃, the iron concentrate grade is increased by 0.26%, the tailings iron grade is decreased by 0.31%, and the reagent consumption is reduced by 10.00%.

[0030] (2) The laboratory used a flotation process of roughing, cleaning and scavenging to evaluate the reagents. Under the condition that the mineral processing indicators are qualified, compared with the iron ore collector used in Baogang mineral processing plant, the flotation temperature is 23℃, the iron concentrate grade is increased by 0.18%, the iron grade of tailings is decreased by 0.41%, and the reagent consumption is reduced by 2.00%.

[0031] Example 4

[0032] In a reaction vessel, 0.1 mol of lauric acid and 0.05 mol of triphosgene were added separately. The mixture was heated to 75°C with stirring to dissolve the compounds. 0.05 mol of DMF was then slowly added dropwise. After the addition was complete, the reaction proceeded for 2 hours, and the upper layer was lauricyl chloride. In another reaction vessel, 0.1 mol of malic acid and 45 ml of pyridine were added separately. 0.1 mol of lauricyl chloride was then added dropwise with stirring. The mixture was heated to 100°C and reacted for 3 hours. Then, 30 ml of 4 mol / L NaOH solution was added, and stirring continued for 2 hours, yielding a colorless and clear solution, which is C. 11 H 23 COOCH(CH2COONa)COONa collector.

[0033] Product performance:

[0034] (1) The laboratory used a flotation process with one rougher, one cleaner, and three sweepers to evaluate the reagents. Under the condition that the mineral processing indicators are qualified, compared with the iron ore collector used in Guanbaoshan Industrial, the iron concentrate grade increased by 0.12% and the tailings iron grade decreased by 0.24% when the flotation temperature was 18℃, and the reagent consumption decreased by 3.00%.

[0035] (2) The laboratory used a flotation process of roughing, cleaning and scavenging to evaluate the reagents. Under the condition that the mineral processing indicators are qualified, compared with the iron ore collector used in Baogang mineral processing plant, the flotation temperature is 26℃, the iron concentrate grade is increased by 0.10%, the tailings iron grade is decreased by 0.17%, and the reagent consumption is reduced by 1.50%.

[0036] Example 5

[0037] In a reaction vessel, 0.1 mol of oleic acid and 0.05 mol of triphosgene were added separately. The mixture was heated to 70°C with stirring to dissolve the oleic acid. 0.05 mol of DMF was slowly added dropwise. After the addition was complete, the reaction was carried out for 2 hours. The mixture was then separated; the upper layer was oleic acid chloride. In another reaction vessel, 0.1 mol of lactic acid and 45 ml of pyridine were added separately. 0.1 mol of oleic acid chloride was added dropwise with stirring. The mixture was heated to 70°C and reacted for 3 hours. Then, 30 ml of 4 mol / L NaOH solution was added, and stirring was continued for 2 hours. A colorless, clear solution was obtained, which was C8H4N2. 17 CH=CHC7H 14 COOCH(CH3)COONa. Take 70% of the above colorless and clear liquid, add 0.03 mol of sodium laurylate, stir and mix well to prepare a 2% concentration of collector.

[0038] Product performance:

[0039] (1) The laboratory used a flotation process with one rougher, one cleaner and three sweepers to evaluate the reagents. Under the condition that the mineral processing index is qualified, compared with the iron ore collector used by Guanbaoshan Industry, the flotation temperature is 15℃, the iron concentrate grade increases by 0.14%, the tailings iron grade decreases by 0.40%, and the reagent consumption decreases by 5.00%.

[0040] (2) The laboratory used a flotation process of roughing, cleaning and scavenging to evaluate the reagents. Under the condition that the mineral processing indicators are qualified, compared with the iron ore collector used in Baogang mineral processing plant, the flotation temperature is 25℃, the iron concentrate grade increases by 0.20%, the tailings iron grade decreases by 0.29%, and the reagent consumption decreases by 2.00%.

[0041] Example 6

[0042] In a reaction vessel, 0.1 mol of lauric acid and 0.05 mol of triphosgene were added separately. The mixture was heated to 65°C with stirring to dissolve them. 0.05 mol of DMF was then slowly added dropwise. After the addition was complete, the reaction proceeded for 2 hours, and the upper layer was lauricyl chloride. In another reaction vessel, 0.1 mol of lactic acid and 45 ml of pyridine were added separately. 0.1 mol of lauricyl chloride was then added dropwise with stirring. The mixture was heated to 80°C and reacted for 3 hours. Then, 30 ml of 4 mol / L NaOH solution was added, and stirring continued for 2 hours, yielding a colorless and clear solution, which is C. 11 H 23 COOCH(CH3)COONa. Take 30% of the above colorless and clear liquid, add 0.07 mol sodium oleate, stir and mix well to prepare a 2% concentration collector.

[0043] Product performance:

[0044] (1) The laboratory used a flotation process with one rougher, one cleaner, and three sweepers to evaluate the reagents. Under the condition that the mineral processing indicators are qualified, compared with the iron ore collector used by Guanbaoshan Industrial, the iron concentrate grade increased by 0.11% and the tailings iron grade decreased by 0.36% at a flotation temperature of 15℃, while the reagent consumption was the same.

[0045] (2) The laboratory used a flotation process of roughing, cleaning and scavenging to evaluate the reagents. Under the condition that the mineral processing indicators are qualified, compared with the iron ore collector used in Baogang mineral processing plant, the flotation temperature is 20℃, the iron concentrate grade is increased by 0.16%, the tailings iron grade is decreased by 0.25%, and the reagent consumption is the same.

Claims

1. A room temperature flotation collector for iron ore, characterized in that, The collector is an iron ore room temperature flotation collector containing a structure shown in formula R1-COO-CH(R2)COOM, R1 is C 8-18 alkyl, R2 is CH3, CH2COOM, M is Na + or K + ; The method for preparing the collector includes the following steps: (1) Using carboxylic acids as raw materials, react with triphosgene, with a molar ratio of carboxylic acids to triphosgene of 1:0.4~0.8, a reaction temperature of 50℃~80℃, adding DMF catalyst dropwise, and a reaction time of 1h~3h to generate acyl chloride with the structure shown in formula R1-COCl; (2) Acyl chloride reacts with α-hydroxy acid to generate an iron ore room temperature flotation collector with the structure shown in formula R1-COO-CH(R2)COOM.

2. The iron ore room temperature flotation collector according to claim 1, characterized in that, In step (2), the molar ratio of acyl chloride to α-hydroxy acid is 1:0.8~1.0, the reaction temperature is 40℃~100℃, and the reaction time is 2h~5h.

3. The iron ore room temperature flotation collector according to claim 1, characterized in that, The acyl chloride is oleic acid acyl chloride or lauroyl chloride.

4. The iron ore room temperature flotation collector according to claim 1, characterized in that, The α-hydroxy acid mentioned is lactic acid or malic acid.

5. The iron ore room temperature flotation collector according to claim 1, characterized in that, The room temperature refers to a pulp temperature of 5℃ to 40℃, and the low temperature refers to a pulp temperature of 5℃ to 15℃.

6. The application of the iron ore room temperature flotation collector according to claim 1, characterized in that, The iron ore room temperature flotation collector can be used alone or in combination with fatty acid collectors.