CN-117920465-B - Preparation and application of apatite combination inhibitor

Abstract

The invention discloses preparation and application of an apatite combination inhibitor, and belongs to the field of ore separation. The combined inhibitor comprises L-malic acid, hypochlorous acid and sulfuric acid, wherein the mass ratio of the L-malic acid to the hypochlorous acid to the sulfuric acid with the concentration of 10% is 1 (1-5) (2:4), the combined inhibitor is adopted to perform rough one-sweep-over-and-over-selection, the dosage of the combined inhibitor in rough separation is 10-13 kg/t, the dosage of the combined inhibitor in scavenging is 1kg/t, and the dosage of the combined inhibitor in selecting is 2-3 kg/t.

Inventors

• DU LINGPAN
• WANG MENGLAI
• LIU DIANWEN
• CAO QINBO
• LI JIANGLI
• XU SHUAI
• HE HAITAO
• YANG WENQUAN

Assignees

• 云南磷化集团有限公司
• 昆明理工大学

Dates

Publication Date

20260512

Application Date

20240126

Claims (4)

1. 1. A preparation method of an apatite combination inhibitor is characterized in that the combination inhibitor comprises L-malic acid, hypochlorous acid and sulfuric acid with the concentration of 10%, wherein the mass ratio of the L-malic acid to the hypochlorous acid to the sulfuric acid with the concentration of 10% is 1 (1-5) (2:4), and the specific preparation steps are as follows: (1) Reacting L-malic acid with hypochlorous acid at 50-70 ℃ and using vanadium pentoxide as a catalyst for 30-60 minutes to finish the reaction; (2) Adding sulfuric acid with the concentration of 10% into the solution obtained in the step (1) and uniformly mixing to obtain the combined inhibitor.
2. 2. Use of a combination inhibitor according to claim 1 for the flotation of apatite.
3. 3. The method for the flotation of apatite using a combined inhibitor according to claim 2, wherein the combined inhibitor is added to the collophanite and the apatite is obtained by reverse flotation in a coarse-sweep-recleaning process.
4. 4. The method for preparing the combined inhibitor for the apatite flotation, which is characterized by comprising the steps of using 10-13 kg/t of combined inhibitor in roughing, 1kg/t of combined inhibitor in scavenging and 2-3 kg/t of combined inhibitor in recleaning.

Description

Preparation and application of apatite combination inhibitor Technical Field The invention relates to preparation and application of an apatite combination inhibitor, and belongs to the field of ore separation. Background The method is characterized in that the carbonate such as apatite and dolomite is separated by the common reverse flotation technology for the dressing of collophanite, and phosphoric acid can be used as an inhibitor of phosphorite, but the price of the phosphoric acid is much higher than that of sulfuric acid, so that the phosphoric acid is not used on a large scale. The most currently used inhibitors are sulfuric acid, which inhibits apatite, thereby floating dolomite with fatty acids under acidic conditions. The dosage of the sulfuric acid inhibitor is large and is generally more than 10kg/t, and the addition of sulfuric acid can generate calcium sulfate precipitation to block a pipeline, so that the process stability is affected, and an enterprise is in urgent need of an efficient inhibitor. Disclosure of Invention In order to solve the problems in the prior art, one of the purposes of the invention is to provide a preparation method of an apatite combination inhibitor, wherein the combination inhibitor comprises L-malic acid, hypochlorous acid and sulfuric acid, the mass ratio of the L-malic acid to the hypochlorous acid to the sulfuric acid is 1 (1-5): (2:4), and the specific preparation steps are as follows: (1) Reacting L-malic acid with hypochlorous acid at 50-70 ℃, and using vanadium pentoxide (V 2O5) as a catalyst (the dosage of the vanadium pentoxide as the catalyst has no special requirement), wherein the reaction is completed in 30-60 minutes; (2) Adding sulfuric acid with the concentration of 10% into the solution obtained in the step (1) and uniformly mixing to obtain the combined inhibitor. It is another object of the present invention to provide the use of a combined suppressant in the flotation of apatite. Preferably, the combined inhibitor is added into the collophanite to obtain the apatite through reverse flotation in a coarse-sweep-recleaning process. Preferably, the dosage of the combined inhibitor in the rough concentration is 10-13 kg/t, the dosage of the combined inhibitor in the scavenging process is 1kg/t, and the dosage of the combined inhibitor in the recleaning process is 2-3 kg/t. The invention adopts the principle that L-malic acid (C 4H6O5) is used as a raw material, vanadium pentoxide is used as a catalyst, and reacts with hypochlorous acid at 50-70 ℃ to oxidize OH groups in the L-malic acid into aldehyde groups, so that a reaction product 2-aldehyde-succinic acid is obtained, wherein the reaction equation is as follows: COOH in the 2-aldehyde-succinic acid can act with Ca on the surface of the apatite, and simultaneously, oxygen in the aldehyde group c=o can also act with Ca on the surface of the apatite, and L-malic acid cannot inhibit the apatite, so that the effect of the 2-aldehyde-succinic acid and the surface of the apatite can be inhibited, when the 2-aldehyde-succinic acid and sulfuric acid are mixed for use, sulfuric acid can form a calcium sulfate component with the surface of the apatite, and the 2-aldehyde-succinic acid can continue to act with a plurality of calcium atoms on the surface, so that the absorption of a collector on the surface of the apatite is further prevented, and the consumption of sulfuric acid is reduced. The beneficial effects of the invention are that (1) The mixed medicament of the L-malic acid and the hypochlorous acid reaction product 2-aldehyde-succinic acid and sulfuric acid can obviously reduce the dosage of the inhibitor, has obvious inhibition effect on the apatite, and does not influence the floatability of dolomite, thereby realizing the efficient separation of the apatite and the dolomite from the collophanite. (2) The usage amount of the sulfuric acid inhibitor is reduced, the pH value of the ore pulp is between 6 and 6.5, and a large amount of calcium sulfate is not generated in the ore pulp, so that the phenomenon of blocking a pipeline occurs. Detailed Description The present invention will be described in further detail with reference to the following specific examples, it being understood that the specific examples described herein are for the purpose of illustration only and the scope of the invention is not limited to the disclosure. The ore-modifying sample used in all examples was selected from the group consisting of Yunnan phosphate rock enterprise, the raw ore sample P 2O5 grade 20.53%, mgO grade 6.56%, siO 2 grade 15.08%, caO grade 36.33% and Al 2O3 grade 1.19%. The main useful minerals of the mineral sample are collophanite, and gangue minerals include dolomite, quartz, feldspar and the like. The collectors used in the examples were YP6-6 mixed fatty acid collectors, the amounts of the agents used in each example are shown in table 1, and apatite was obtained by reverse flotation separation in