Impurity removal and purification method of barite

Abstract

The invention discloses an impurity removal and purification method of barite, and relates to the technical field of mineral processing technologies. Compared with a previous barite purification method, the problems that a traditional impurity removal purification method is low in efficiency, high in cost, unfriendly to the environment and the like, and the requirements of modern industry are difficult to meet are solved; through fine grading treatment and combination of different impurity removal and purification processes, the impurity content can be greatly reduced, the barite ore which is originally low in quality can be fully utilized, resource waste is reduced, maximum utilization of resources is achieved, and therefore the overall production cost is reduced, and the economic benefits of enterprises are improved; meanwhile, the purity of the barite reaches a higher standard, and the strict requirement of the high-end application field on the product quality is met. And an environment-friendly impurity removal and purification process is adopted, so that the emission of pollutants such as wastewater and waste residues can be reduced, the damage to the environment is reduced, and the requirement of sustainable development is met.

Description

Technical Field

[0001] The invention relates to the technical field of mineral processing technology, and in particular to a method for removing impurities and purifying barite. Background Art

[0002] As an important industrial mineral raw material, barite is widely used in many fields, such as petroleum, chemical industry, paint, filler, etc. However, naturally produced barite ore often contains various impurities, such as quartz, calcite, dolomite, clay minerals and iron oxide, etc. The presence of these impurities will seriously affect the quality and application performance of barite.

[0003] With the continuous development and progress of industrial technology, the purity and quality requirements of barite are getting higher and higher. In many high-end application fields, such as electronic materials, high-performance coatings, etc., high-purity barite products are required. Traditional impurity removal and purification methods have problems such as low efficiency, high cost, and unfriendly to the environment, which are difficult to meet the needs of modern industry.

[0004] In order to solve the above problems, the present invention provides a method for removing impurities and purifying barite. Summary of the invention

[0005] The object of the present invention is to provide a method for removing impurities and purifying barite to solve the problems raised in the background technology:

[0006] Traditional impurity removal and purification methods have problems such as low efficiency, high cost, and environmental unfriendliness, and are difficult to meet the needs of modern industry.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A method for removing impurities and purifying barite comprises the following steps:

[0009] S1: Wash the barite ore to remove surface impurities and screen it at the same time;

[0010] S2: crush the screened ore and perform graded desludging according to different particle sizes;

[0011] S3: Set the magnetic induction intensity to 1.0-1.3T and the pulsation frequency to 110-120 times / min, and perform magnetic separation in a high gradient magnetic separator;

[0012] S4: Put the magnetic separation product into the flotation machine, add 40-50 mL of deionized water and stir for 1-3 minutes to mix the pulp evenly, then adjust the pulp to pH=8 with a pH adjuster, then add the inhibitor and collector in sequence, and perform flotation with microwave action;

[0013] S5: drying the flotation product, adding a hydrochloric acid solution with a concentration of 5 to 6 mol / L thereto, and acid leaching at 80 to 90° C. for 3 to 5 hours, and finally washing and drying to obtain purified barite.

[0014] Preferably, in S2, the ore is divided into +74 μm and -74 μm particle sizes, and a fine sand shaking table and a fine mud shaking table are used for gravity separation respectively, and the feed concentration is controlled to be 30% and the bed surface inclination is 3°.

[0015] Preferably, the reselection process includes one rough selection and one fine selection.

[0016] Preferably, the magnetic separation process in S3 includes one roughing separation, one scavenging separation and one concentrating separation, and the feed concentration is 30%.

[0017] Preferably, the flotation process in S4 includes 2 roughing selections, 2 scavenging selections and 5 concentrating selections; wherein, a roughing selection is performed first, then two consecutive scavenging selections are performed, then a roughing selection is performed again, and finally 5 concentrating selections are performed.

[0018] Preferably, in S4, the pH adjuster is a sodium carbonate solution.

[0019] Preferably, the inhibitor is a maleic acid-acrylic acid copolymer in an amount of 35 to 40 g / L.

[0020] Preferably, the collector is a mixture of sodium dodecyl sulfate and sodium oleate in a ratio of 2:1 to 3:1, wherein the amount of sodium oleate used is 50 g / t.

[0021] Compared with the prior art, the present invention provides a method for removing impurities and purifying barite, which has the following beneficial effects:

[0022] The present invention can significantly reduce the impurity content by combining different impurity removal and purification processes through refined classification treatment, can make full use of the barite ore with originally low quality, reduce resource waste, and maximize the utilization of resources, thereby reducing the overall production cost and improving the economic benefits of the enterprise; at the same time, the purity of barite is made to reach a higher standard, meeting the strict requirements of high-end application fields for product quality. And the present invention adopts an environmentally friendly impurity removal and purification process, which can reduce the discharge of pollutants such as wastewater and waste residue, reduce damage to the environment, and meet the needs of sustainable development. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a flow chart of the method mentioned in Example 1 of the present invention;

[0024] Figure 2 This is a schematic diagram of the results of impurity removal and purification of barite in Example 2 mentioned in the examples of the present invention;

[0025] Figure 3 This is a schematic diagram of the results of impurity removal and purification of barite in Example 3 mentioned in the examples of the present invention;

[0026] Figure 4 It is a schematic diagram of the impurity removal and purification results of the barite of Example 4 mentioned in the examples of the present invention;

[0027] Figure 5 This is a schematic diagram of the results of impurity removal and purification of barite in Example 5 mentioned in the examples of the present invention;

[0028] Figure 6 This is a schematic diagram of the results of impurity removal and purification of barite in Example 6 mentioned in the examples of the present invention;

[0029] Figure 7 This is a schematic diagram of the results of impurity removal and purification of barite in Example 7 mentioned in the examples of the present invention;

[0030] Figure 8 This is a schematic diagram of the results of impurity removal and purification of barite in Example 8 mentioned in the examples of the present invention;

[0031] Fig. 9 This is a schematic diagram of the results of impurity removal and purification of barite in Example 9 mentioned in the examples of the present invention;

[0032] Fig.10 This is a schematic diagram of the results of impurity removal and purification of barite in Example 10 mentioned in the examples of the present invention;

[0033] Fig.11 This is a schematic diagram of the results of impurity removal and purification of barite in Example 11 mentioned in the examples of the present invention. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0035] The present invention can significantly reduce the impurity content by combining different impurity removal and purification processes through refined classification treatment, can make full use of the barite ore with originally low quality, reduce resource waste, and maximize the utilization of resources, thereby reducing the overall production cost and improving the economic benefits of the enterprise; at the same time, the purity of barite is made to reach a higher standard, meeting the strict requirements of high-end application fields for product quality. And the present invention adopts an environmentally friendly impurity removal and purification process, which can reduce the discharge of pollutants such as wastewater and waste residue, reduce damage to the environment, and meet the needs of sustainable development. Specifically include the following contents.

[0036] Embodiment 1:

[0037] See also Figure 1 The present invention provides a method for removing impurities and purifying barite, comprising the following steps:

[0038] S1: Wash the barite ore to remove surface impurities and screen it at the same time;

[0039] The barite ore is washed to remove impurities such as dirt and dust on the surface. At the same time, it is screened to separate oversized and undersized particles to make the ore particle size more uniform, creating good conditions for subsequent mineral processing operations.

[0040] S2: crush the screened ore and perform graded desludging according to different particle sizes;

[0041] The sieved ore is crushed to reach the appropriate particle size range. Then it is graded and deslimed according to the +74μm and -74μm particle sizes. Fine sand shaker and fine mud shaker are used for gravity separation respectively. The feed concentration is controlled at 30% and the bed inclination is 3°. Fine impurities such as ore slime are removed through one roughing and one concentrating to reduce interference with the subsequent beneficiation process.

[0042] Use gravity separation equipment such as jigs and shaking tables for separation. Barite and associated minerals have different densities. Gravity separation can effectively remove minerals with lower density such as gangue and improve the grade of barite.

[0043] S3: Set the magnetic induction intensity to 1.0-1.3T and the pulsation frequency to 110-120 times / min, and perform magnetic separation in a high gradient magnetic separator;

[0044] By adjusting the feed concentration to 30%, after 1 roughing, 1 scavenging and 1 concentrating operation, a magnetic separator is used to remove magnetic iron oxide minerals, such as siderite. Magnetic separation is usually used in conjunction with gravity separation to further improve the purity of barite, which is especially important for the production of barite raw materials for barium-based medicines that require very low iron content.

[0045] S4: Put the magnetic separation product into the flotation machine, add 40-50 mL of deionized water and stir for 1-3 minutes to mix the pulp evenly, then adjust the pulp to pH=8 with a pH adjuster, then add the inhibitor and collector in sequence, and perform flotation with microwave action;

[0046] According to the properties and impurities of barite, a suitable collector is prepared, namely a mixture of sodium dodecyl sulfate and sodium oleate, with a ratio of 3:1, and the amount of sodium oleate is 50g / t. At the same time, the pH value of the pulp is adjusted to 8 by sodium carbonate solution, and 35g / L of maleic acid-acrylic acid copolymer is used as a depressant to create a good environment for flotation.

[0047] Adding collectors to the pulp makes the barite particles combine with bubbles and float to the surface of the pulp to form a foam layer, while the impurity minerals remain in the pulp. The foam layer is collected to obtain barite concentrate.

[0048] S5: drying the flotation product, adding a hydrochloric acid solution with a concentration of 5 to 6 mol / L thereto, and acid leaching at 80 to 90° C. for 3 to 5 hours, and finally washing and drying to obtain purified barite.

[0049] Choose the appropriate leaching method according to the type of impurities. If the impurities are mainly carbon and colored impurities, acid leaching can be used. Use hydrochloric acid solution to dissolve and remove impurities; change the chemical properties of impurities to make them easier to separate. Wash and filter the leached barite to remove residual leachate and impurities to obtain high-purity barite concentrate.

[0050] Through the above comprehensive impurity removal steps, various impurities in barite can be effectively removed, the purity and quality of barite can be improved, and the application requirements in different fields can be met. In actual operation, each step should be optimized and adjusted according to the specific ore properties and production requirements to achieve the best impurity removal effect.

[0051] Embodiment 2:

[0052] The impurity removal and purification method of barite in this embodiment is basically the same as the impurity removal and purification method in Example 1, except that in this embodiment, the feed concentration in S2 is adjusted to 20% / 25% / 30% / 35% / 40% respectively.

[0053] Embodiment 3:

[0054] The impurity removal and purification method of barite in this embodiment is basically the same as the impurity removal and purification method in Example 1, except that in this embodiment, the inclination angle of the bed surface in S2 is adjusted to 1° / 3° / 5° / 7° / 9° respectively.

[0055] Embodiment 4:

[0056] The impurity removal and purification method of barite in this embodiment is basically the same as the impurity removal and purification method in Example 1, except that in this embodiment, the magnetic induction intensity in S3 is adjusted to 0.5 / 0.7 / 1 / 1.3 / 1.5T respectively.

[0057] Embodiment 5:

[0058] The impurity removal and purification method of barite in this embodiment is basically the same as the impurity removal and purification method in Example 1, except that in this embodiment, the pulsation frequency in S3 is adjusted to 100 / 110 / / 120 / 130 / 140 times / min.

[0059] Embodiment 6:

[0060] The impurity removal and purification method of barite in this embodiment is basically the same as the impurity removal and purification method in Example 1, except that in this embodiment, the feed concentration in S3 is adjusted to 20% / 25% / 30% / 35% / 40% respectively.

[0061] Embodiment 7:

[0062] The method for removing impurities and purifying barite in this embodiment is basically the same as the method for removing impurities and purifying barite in Example 1, except that in this embodiment, the amount of inhibitor in S4 is adjusted to 25 / 30 / 35 / 40 / 45 g / t, and an experimental group with an inhibitor amount of 35 g / t without microwave action is set up.

[0063] Embodiment 8:

[0064] The impurity removal and purification method of barite in this embodiment is basically the same as the impurity removal and purification method of Example 1, except that in this embodiment, the ratio of sodium dodecyl sulfate and sodium oleate in the collector in S4 is adjusted to all sodium dodecyl sulfate / all sodium oleate / 1:1 / 2:1 / 3:1 / 1:2 / 1:3, wherein the amount of sodium oleate is 50 g / t, and at the same time, a group of experimental groups in which the ratio of sodium dodecyl sulfate and sodium oleate is 3:1 without microwave action and the amount of sodium oleate is 50 g / t are set.

[0065] Embodiment 9:

[0066] The impurity removal and purification method of barite in this embodiment is basically the same as the impurity removal and purification method in Example 1, except that in this embodiment, the temperature in S5 is adjusted to 60°C / 70°C / 80°C / 90°C / 100°C.

[0067] Embodiment 10:

[0068] The impurity removal and purification method of barite in this embodiment is basically the same as the impurity removal and purification method in Example 1, except that in this embodiment, the concentration of the hydrochloric acid solution in S5 is adjusted to 3mol / L / 4mol / L / 5mol / L / 6mol / L / 7mol / L.

[0069] Embodiment 11:

[0070] The impurity removal and purification method of barite in this embodiment is basically the same as the impurity removal and purification method in Example 1, except that the acid leaching time in S5 is adjusted to 1h / 2h / 3h / 4h / 5h in this embodiment.

[0071] Control group:

[0072] In this embodiment, the barite is purified by the impurity removal and purification method of ordinary barite, and the barite after impurity removal and purification is tested, and the barite quality is obtained to be 68.16%, the recovery rate is 70.35%, the purity is 85.49%, and the whiteness is 82.68%.

[0073] Reference Figures 2 to 11 , which are the product test results of Examples 2 to 11, respectively. It can be seen from the figure that the taste and recovery rate of the barite purified by impurities removal according to Example 1 are relatively high, and the purity and whiteness are also relatively high.

[0074] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for removing impurities and purifying barite, It is characterized in that The steps include: S1: Wash the barite ore to remove surface impurities and screen it at the same time; S2: crush the screened ore and perform graded desludging according to different particle sizes; S3: Set the magnetic induction intensity to 1.0-1.3T and the pulsation frequency to 110-120 times / min, and perform magnetic separation in a high gradient magnetic separator; S4: Put the magnetic separation product into the flotation machine, add 40-50 mL of deionized water and stir for 1-3 minutes to mix the pulp evenly, then adjust the pulp to pH=8 with a pH adjuster, then add the inhibitor and collector in sequence, and perform flotation with microwave action; S5: drying the flotation product, adding a hydrochloric acid solution with a concentration of 5 to 6 mol / L thereto, and acid leaching at 80 to 90° C. for 3 to 5 hours, and finally washing and drying to obtain purified barite.

2. A method for removing impurities and purifying barite according to claim 1, It is characterized in that In the S2, the ore is divided into +74 μm and -74 μm grades, and a fine sand shaking table and a fine mud shaking table are used for gravity separation respectively, and the feed concentration is controlled to be 30% and the bed surface inclination is 3°.

3. A method for removing impurities and purifying barite according to claim 2, It is characterized in that The reselection process includes one rough selection and one fine selection.

4. A method for removing impurities and purifying barite according to claim 1, It is characterized in that The magnetic separation process in S3 includes one roughing separation, one scavenging separation and one concentrating separation, and the feed concentration is 30%.

5. A method for removing impurities and purifying barite according to claim 1, It is characterized in that The flotation process in S4 includes 2 roughing selections, 2 scavenging selections and 5 concentrating selections; wherein, a roughing selection is performed first, then two consecutive scavenging selections are performed, then a roughing selection is performed again, and finally 5 concentrating selections are performed.

6. A method for removing impurities and purifying barite according to claim 5, It is characterized in that In the above-mentioned S4, the pH adjusting agent is a sodium carbonate solution.

7. A method for removing impurities and purifying barite according to claim 6, It is characterized in that The inhibitor is a maleic acid-acrylic acid copolymer with a dosage of 35-40 g / L.

8. A method for removing impurities and purifying barite according to claim 7, It is characterized in that The collector is a mixture of sodium dodecyl sulfate and sodium oleate in a ratio of 2:1 to 3:1, wherein the amount of sodium oleate is 50 g / t.

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