CN-121988462-A - Combined inhibitor for direct flotation of middle-low grade phosphorite and application thereof

Abstract

The invention discloses a combined inhibitor for forward flotation of middle-low grade phosphorite and application thereof, and belongs to the technical field of mineral processing flotation. The combination inhibitors include zinc sulfate, pyridine-2, 6-dicarboxylic acid, and carboxymethyl cellulose. The combined inhibitor adopts a process flow of one coarse process and two fine process and one sweep process, and can realize the separation of medium-low grade phosphate ores and calcium-silicon gangue minerals and the efficient floatation and enrichment of the phosphate ores. The invention obviously improves the inhibition capability and selectivity to calcium-siliceous gangue through the synergistic effect of zinc sulfate, pyridine-2, 6-dicarboxylic acid and carboxymethyl cellulose, and each component in the combined inhibitor is a green and environment-friendly biodegradable flotation reagent, and the reagent is simple and convenient in preparation process and convenient to store and transport. The invention has important significance for efficient floatation enrichment and resource utilization of phosphorite resources.

Inventors

• DONG LIUYANG
• MIAO DONGYANG
• ZHANG KUNSHENG
• LIU DIANWEN
• Lan Shengzong
• ZHENG QIFANG
• CUI YANRU
• SHEN PEILUN
• MAO YUQIANG
• ZHANG TIANFU

Assignees

• 昆明理工大学

Dates

Publication Date

20260508

Application Date

20260226

Claims (9)

1. 1. A combined inhibitor for direct flotation of medium-low grade phosphorite is characterized by comprising, by mass, 5% -10% of zinc sulfate, 20% -30% of pyridine-2, 6-dicarboxylic acid and 60% -75% of carboxymethyl cellulose, wherein the total mass of the components of the combined inhibitor is 100%.
2. 2. The application of the combined inhibitor in the forward flotation of the medium-low grade phosphate ores as claimed in claim 1, which is characterized by comprising the following steps: (1) Crushing and grinding the phosphorite raw ore, and mixing pulp to obtain ore pulp; (2) Adding a combined inhibitor into the ore pulp obtained in the step (1), stirring, adding a collector, stirring, and aerating for roughing to obtain roughing concentrate and roughing tailings; (3) Phosphate ore concentration, namely, carrying out concentration on the roughing concentrate obtained in the step (2), adding a combined inhibitor in the concentration I operation, stirring, and carrying out ventilation flotation; (4) And (3) phosphate ore scavenging, namely scavenging the roughing tailings obtained in the step (2), adding a collector in scavenging I operation, stirring, and carrying out ventilation floatation to obtain the tailings.
3. 3. The use of a combination inhibitor according to claim 2 in the forward flotation of low and medium grade phosphate rock, wherein the crushing grinding in step (1) is grinding to-200 mesh with a 75% -85% ratio.
4. 4. The use of a combination inhibitor according to claim 2 in the forward flotation of medium and low grade phosphate ores, wherein the slurry is conditioned to a concentration of 30% -45% in step (1).
5. 5. The use of a combination inhibitor according to claim 2 in the forward flotation of medium and low grade phosphate ores, wherein the pulp in step (1) has a pH of 9-11.
6. 6. The application of the combined inhibitor in the forward flotation of the middle-low grade phosphorite according to claim 2, wherein the dosage of the combined inhibitor in the step (2) is 400-800g/t, the collector is sodium oleate or oxidized paraffin soap, and the dosage of the collector is 300-600g/t.
7. 7. The application of the combined inhibitor in the forward flotation of the middle-low grade phosphate ore according to claim 2, wherein the dosage of the combined inhibitor in the carefully chosen I operation in the step (3) is 200-400g/t, and the dosage of the combined inhibitor in the carefully chosen II operation is 100-200g/t.
8. 8. The application of the combined inhibitor in the forward flotation of the medium-low grade phosphate ores according to claim 2, wherein the collector in the scavenging I operation in the step (4) is sodium oleate or oxidized paraffin soap, and the dosage of the collector is 150-300g/t.
9. 9. The application of the combined inhibitor in the direct flotation of the medium-low grade phosphate ores according to claim 2 is characterized in that the combined inhibitor is added in the flotation by dissolving zinc sulfate and pyridine-2, 6-dicarboxylic acid in water to prepare a mixed solution A for standby, dissolving carboxymethyl cellulose in water to prepare a solution B for standby, and adding the mixed solution A when adding ore pulp, and adding the solution B after stirring for 1 min.

Description

Combined inhibitor for direct flotation of middle-low grade phosphorite and application thereof Technical Field The invention relates to the technical field of mineral processing flotation, in particular to a combined inhibitor for forward flotation of middle-low grade phosphorite and application thereof. Background Phosphorite is a main source of phosphorus resources, is an important nonmetallic strategic mineral resource, has irreplaceability and irreproducibility, is widely applied to agricultural production and phosphorus chemical industry, and has high-efficiency utilization and balanced supply related to the production capacity of grains and grain safety. Flotation is the most commonly used method for efficient development and utilization of phosphorite, and at present, phosphorite grade in China is lower and lower, and the method cannot be directly used for wet-process phosphoric acid or phosphate fertilizer production. The flotation can effectively separate the phosphorus minerals and the gangue, greatly improves the grade of the phosphorus ores, meets the industrial requirements, and greatly expands the available phosphorus resource reserves. The core challenge of phosphorite flotation is the separation of apatite from calcareous gangue (such as calcite and dolomite) and siliceous gangue (such as quartz and mica), because the physical and chemical properties of the surfaces of the apatite and the siliceous gangue are similar or the mutual interference exists under the interaction factors of ions in a pulp environment, so that the phosphorite flotation is similar in floatability and difficult to separate, and in addition, the traditional fatty acid collector has strong affinity to calcium ions and can be adsorbed on the surfaces of three minerals indiscriminately. Under the pulp environment, pulp dissolved ions can be indiscriminately adsorbed on the surfaces of minerals, so that the chemical properties of the surfaces of target minerals and calcium-containing gangue minerals tend to be similar. The most commonly used inhibitors at present are inorganic inhibitors mainly comprising water glass, and the inhibitors have extremely strong inhibition capability and are popularized, but have poor inhibition selectivity, and meanwhile have a plurality of defects, such as poor selectivity, easiness in inhibiting phosphorus minerals, excessively dispersed ore pulp, high fine concentrate mud content, difficult dehydration, sensitivity to water quality and temperature and severe dosage control requirements. Therefore, developing a selective inhibitor of high-efficiency gangue minerals is important for improving the grade of phosphorite and efficiently enriching phosphorite by floatation. Disclosure of Invention The invention aims to provide a combined inhibitor for direct flotation of medium-low grade phosphate ores, which aims to solve the problem of poor selective inhibition capability on gangue minerals in phosphate ore flotation, and comprises, by mass, 5% -10% of zinc sulfate, 20% -30% of pyridine-2, 6-dicarboxylic acid and 60% -75% of carboxymethyl cellulose, wherein the total mass of the components of the combined inhibitor is 100%. The invention also aims to provide an application of the combined inhibitor in the forward flotation of medium-low grade phosphorite, which specifically comprises the following steps: (1) Crushing and grinding the phosphorite raw ore, and mixing pulp to obtain ore pulp. (2) And (3) roughing phosphorite, namely adding a combined inhibitor into the ore pulp obtained in the step (1), stirring, adding a collector, stirring, and aerating for roughing to obtain roughing concentrate and roughing tailings. (3) And (3) phosphate ore concentration, namely, carrying out concentration on the rougher concentrate obtained in the step (2), adding a combined inhibitor in the concentration I operation, stirring, and carrying out ventilation flotation, and adding the combined inhibitor in the concentration II operation, stirring, and carrying out ventilation flotation, so as to obtain the phosphate concentrate. (4) And (3) phosphate ore scavenging, namely scavenging the roughing tailings obtained in the step (2), adding a collector in scavenging I operation, stirring, and carrying out ventilation floatation to obtain the tailings. Preferably, crushing and grinding are carried out in the step (1) until the grinding is carried out to 200 meshes with the proportion of 75-85%. Preferably, in the step (1), the slurry is mixed to the concentration of 30% -45%. Preferably, the pulp in step (1) of the present invention has a pH of 9-11. Preferably, the dosage of the combined inhibitor in the step (2) is 400-800g/t, the collector is sodium oleate or oxidized paraffin soap, and the dosage of the collector is 300-600g/t. Preferably, the dosage of the combined inhibitor in the carefully chosen I operation of the step (3) is 200-400g/t, and the dosage of the combined inhibitor in the carefully chosen II o