Nicotinyl hydroxamic acid collector and its preparation method and application
A technology of nicotinic hydroxamic acid and nicotinic hydroxime is applied in the field of nicotinic hydroxamic acid collector and preparation thereof, and can solve the problems of high price, hindering industrial application and promotion of hydroxamic acid collectors, and the like, Achieve the effect of low chemical cost, improved flotation effect and beneficiation index, and easy addition and operation.
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Embodiment 1
[0025] Embodiment 1: the preparation of nicotinyl hydroxamic acid
[0026] Pour 200mL of anhydrous methanol into a 500mL three-necked flask, heat at a constant temperature in an oil bath at 50°C, condense and reflux at room temperature; first take 8.34 parts of hydroxylamine hydrochloride into the three-necked flask, then add 8.8 parts of sodium hydroxide in 3 batches, and the reaction time is 30 minutes ; Filtrate the reactant to obtain the filtrate; add the nicotinic acid methyl ester of the structure shown in the formula-II to the filtrate, then heat the reaction system in a constant temperature water bath at 80°C for 10 hours, and distill the solution under reduced pressure after the reaction to obtain nicotinyl hydroxy The crude product of hydroxamic acid; wash the crude product with ethyl acetate for 3 to 4 times, and filter to obtain high-purity nicotinyl hydroxamic acid. The reaction process is shown in formula-III and formula-IV.
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Embodiment 2
[0029] Example 2: Comparison of the flotation performance of nicotinyl hydroxamic acid and other hydroxamic acids on black tungsten pure minerals
[0030] The flotation test was carried out by XFGⅡ hanging tank flotation machine. The feeding particle size of black tungsten pure mineral is 0.074mm~0.038mm. First, add 2g of pure minerals and 35mL of distilled water to the flotation cell, stir and adjust the slurry for 1min; then use HCl or NaOH to adjust the pH of the slurry to the value set in Table 1 and Table 2, and stir for 2min; then, add the activator Pb (NO 3 ) 2 44mg / L, action time 5min, collector hydroxamic acid, action time 3min, foaming agent No. 2 oil 5mg / L, action time 1min, finally inflated and scraped for 5min; after the flotation test, the foam product was filtered , drying, weighing, and calculating the recovery rate. The detailed test process and pharmaceutical system are as follows: figure 1 As shown, the test results are shown in Table 1 and Table 2.
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Embodiment 3
[0035] Example 3: Comparison of the flotation performance of nicotinyl hydroxamic acid and other hydroxamic acids on pure scheelite minerals
[0036] The flotation test was carried out by XFGⅡ hanging tank flotation machine. The feed particle size of scheelite pure mineral is 0.074mm~0.038mm. First, add 2g of pure minerals and 35mL of distilled water to the flotation cell, stir and adjust the slurry for 1min; then use HCl or NaOH to adjust the pH of the slurry to the value set in Table 3 and Table 4, and stir for 2min; then, add the collector hydroxime in sequence Acid, action time 3min, foaming agent No. 2 oil 5mg / L, action time 1min, and finally inflated and scraped for 5min; after the flotation test, the foam product was filtered, dried, weighed, and the recovery rate was calculated. The test process and drug system are as follows: figure 2 As shown, the test results are shown in Table 3 and Table 4.
[0037] Table 3 hydroxamic acid is to the flotation performance test ...
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