A method for the flotation separation of dolomite and barite

Abstract

The present invention provides a method for the flotation separation of dolomite and barite, belonging to the technical field of mineral processing engineering. The present invention uses regulators to control the surface properties of dolomite and barite, and realizes the reverse flotation enrichment of barite by floating dolomite, which can avoid the surface hydrophobization of barite due to the action of collector during the flotation process, and is beneficial to the use of barite as a weighting agent for oil and gas drilling mud. The flotation process flow of the present invention is simple, and the recovery rate of barite is high, which is conducive to solving the problem of separating fine-grained barite and dolomite that is difficult to solve by processes such as gravity separation and magnetic separation.

Description

Technical Field

[0001] The present invention relates to the technical field of mineral processing engineering, and particularly relates to a method for flotation separation of dolomite and barite. Background Art

[0002] As an important barium-containing mineral, barite is widely used in the fields of petroleum, chemical industry, building materials, and paint due to its characteristics such as high density, low hardness, stable chemical properties, non-toxicity, and absorption of radioactive rays. As an advantageous mineral resource in China, barite is mainly distributed in provinces such as Guizhou, Hunan, Guangxi, Gansu, and Shaanxi, with characteristics of concentrated resource distribution and high occurrence grade. However, with the expansion of the application fields of barite and the accelerated consumption of high-quality resources, the easily selectable high-grade barite resources have been decreasing day by day, and the development and utilization of barite resources in polymetallic associated deposits have attracted more and more attention from the market and enterprises.

[0003] Based on the property differences between barite and gangue minerals, many scholars have currently developed beneficiation technologies such as gravity separation process, magnetic separation process, flotation process, and their combined processes, realizing the comprehensive recovery and utilization of some barite ores. In the existing barite separation and utilization technologies, the key problems to be solved are the separation of barite from gangue minerals such as fluorite, calcite, and quartz. There are few research reports on the flotation separation of barite and dolomite. Therefore, developing a new method for flotation separation of dolomite and barite is of great significance for recovering and utilizing barite from ores containing dolomite. Summary of the Invention

[0004] The present invention provides a method for flotation separation of dolomite and barite, aiming to solve the above problems existing in the background art.

[0005] To achieve the above object, an embodiment of the present invention provides a method for flotation separation of dolomite and barite, including the following steps:

[0006] Select the raw ore, sequentially add a regulator and a collector for pulp conditioning, and then perform flotation to obtain flotation foam and pulp in the cell respectively; the flotation foam is the dolomite product, and the pulp in the cell is the barite product, realizing the flotation separation of dolomite and barite.

[0007] Furthermore, the dosage of the regulator is 0.5 - 6 Kg / t, and the dosage of the collector is 0.05 - 1.5 Kg / t.

[0008] Furthermore, the regulator is one or more of hydrochloric acid, sulfuric acid, trisodium phosphate, disodium hydrogen phosphate, sodium dihydrogen phosphate, phosphoric acid, and sodium pyrophosphate.

[0009] Further, the collector is an anionic collector, and the anionic collector is a fatty acid and its salts mainly composed of oleic acid, linoleic acid, linolenic acid, lauric acid, palmitic acid, stearic acid, or a fatty acid added with a small amount of surfactant.

[0010] The present invention uses a regulator to control the surface properties of dolomite and barite, and then uses an anionic collector such as fatty acid to flotation and remove dolomite to achieve the enrichment of barite.

[0011] The above solution of the present invention has the following beneficial effects:

[0012] 1) By floating out dolomite, the present invention realizes the reverse flotation enrichment of barite, which can avoid the surface hydrophobicity of barite due to the action of the collector during the flotation process, and is more conducive to using barite as a weighting agent for oil and gas drilling mud.

[0013] 2) The flotation process flow of the present invention is simple, and the recovery rate of barite is high, which is especially conducive to solving the problem of recovering fine-grained barite that is difficult to solve by processes such as gravity separation and magnetic separation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0015] Figure 1 It is a process flow diagram of the flotation separation of dolomite and barite in the embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0016] In order to make the technical problems, technical solutions, and advantages to be solved by the present invention clearer, the following will be described in detail with reference to the drawings and specific embodiments.

[0017] Unless otherwise defined, all professional terms used hereinafter have the same meaning as commonly understood by those skilled in the art. The professional terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the protection scope of the present invention.

[0018] Unless otherwise specifically stated, various raw materials, reagents, instruments, and equipment used in the present invention can be obtained through the market or can be prepared by existing methods.

[0019] With the expansion of the application fields of barite and the accelerated consumption of high-quality resources, the easily selectable high-grade barite resources have become increasingly scarce, and there are problems of multi-metal coexistence in barite ore deposits.

[0020] The present invention addresses existing problems and provides a method for the flotation separation of dolomite and barite. The flow chart is as Figure 1 shown.

[0021] An embodiment of the present invention provides a method for the flotation separation of dolomite and barite, comprising the following steps:

[0022] Select the raw ore, sequentially add a regulator and a collector for pulp conditioning, and then perform flotation to separately obtain flotation foam and pulp in the cell; the flotation foam is the dolomite product, and the pulp in the cell is the barite product, realizing the flotation separation of dolomite and barite.

[0023] Furthermore, the dosage of the regulator is 0.5 - 6 Kg / t, and the dosage of the collector is 0.05 - 1.5 Kg / t.

[0024] Furthermore, the regulator is one or more of hydrochloric acid, sulfuric acid, trisodium phosphate, disodium hydrogen phosphate, sodium dihydrogen phosphate, phosphoric acid, and sodium pyrophosphate.

[0025] Furthermore, the collector is an anionic collector, and the anionic collector is a fatty acid and its salts mainly composed of oleic acid, linoleic acid, linolenic acid, lauric acid, palmitic acid, palmitoleic acid, stearic acid, or a fatty acid with a small amount of surfactant added.

[0026] Example 1

[0027] For a flotation tailing containing a large amount of dolomite and barite, the raw ore has a Ba grade of 24.81% and a Ca grade of 10.77%. The main minerals in the pulp are barite and dolomite, with a small amount of pyrite, quartz, etc. First, add 1.8 Kg / t of phosphoric acid and 4 Kg / t of sulfuric acid for pulp conditioning. After pulp conditioning, add 1 Kg / t of oleic acid collector for pulp conditioning. After pulp conditioning, perform reverse flotation of barite. The flotation foam is used as the dolomite product, and the pulp in the cell is used as the barite product.

[0028] Comparative Example 1

[0029] The flotation feed properties and grinding fineness of Comparative Example 1 are the same as those of Example 1.

[0030] After adding 10 Kg / t of sulfuric acid to the pulp, add 1 Kg / t of sodium stearate as the collector. After pulp conditioning, perform reverse flotation of barite. The flotation foam is used as the crude dolomite product, and the pulp in the cell is used as the crude barite product.

[0031] Table 1 Mineral processing indexes of Example 1, Comparative Example 1, and Comparative Example 2

[0032]

[0033] Example 2

[0034] A flotation tailing containing a large amount of dolomite and barite (selected from Guangxi), with the original ore having a Ba grade of 32.57% and a Ca grade of 8.30%. The main minerals in the pulp are barite and dolomite, and there are also a small amount of quartz, pyrite, etc. First, 1500 g / t of phosphoric acid and 200 g / t of sulfuric acid are added for pulp conditioning. After pulp conditioning, 150 g / t of linolenic acid collector is added for pulp conditioning. After pulp conditioning, reverse flotation of barite is carried out. The flotation foam is used as the dolomite product, and the pulp in the cell is used as the barite product.

[0035] Comparative Example 2

[0036] The flotation feed properties and grinding fineness of Comparative Example 2 are the same as those of Example 1.

[0037] The original ore is subjected to shaking table gravity separation, and the gravity separation obtains barite concentrate, middlings, and tailings.

[0038] Table 2 Mineral processing indexes of Example 2 and Comparative Example 2

[0039]

[0040]

[0041] The above-mentioned scheme of the present invention has the following beneficial effects:

[0042] 1) By floating dolomite, the present invention realizes the reverse flotation enrichment of barite, which can avoid the surface hydrophobicity of barite due to the action of the collector during the flotation process, and is more conducive to using barite as a weighting agent for oil and gas drilling mud.

[0043] 2) The flotation process flow of the present invention is simple, and the recovery rate of barite is high, which is particularly conducive to solving the problem of recovering fine-grained barite that is difficult to solve by processes such as gravity separation and magnetic separation.

[0044] The above is the preferred implementation manner of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle described in the present invention, several improvements and refinements can still be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A method for the flotation separation of dolomite and barite, characterized in that, The original ore is selected, and a regulator and a collector are added successively for pulp conditioning, and then flotation is carried out to obtain flotation foam and pulp in the cell respectively; the flotation foam is the dolomite product, and the pulp in the cell is the barite product. By floating out dolomite, reverse flotation enrichment of barite is realized. The main minerals in the original ore pulp are barite and dolomite, and contain a small amount of pyrite and quartz. The regulator is phosphoric acid and sulfuric acid. The collector is oleic acid.

2. The method for the flotation separation of dolomite and barite according to claim 1, characterized in that, The dosage of the regulator is 0.5 - 6 Kg / t, and the dosage of the collector is 0.05 - 1.5 Kg / t.

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