Process for purifying and whitening barite powder

Abstract

The invention relates to the technical field of barite powder purification, and discloses a barite powder purification and whitening process which comprises the following steps: step 1, preparing an ore sample: taking 200g of a No.3306 barite powder ore sample with the particle size of 2500 meshes, the whiteness of the ore sample is 61.0%, and the ore sample mainly comprises barite, calcite and a small amount of quartz through mineral composition analysis, the treatment object requirements of the process are met. According to the barite powder purifying and whitening process, through organic combination of magnetic separation impurity removal and bleaching processes, impurities and colored substances in the barite powder are effectively removed, and the whiteness and purity of the barite powder are remarkably improved. The whiteness of a 3306 ore sample can be improved from 61.0% to 80.7%, the whiteness of a 4210 ore sample can be improved from 73.8% to 90.2%, the whitening effect is remarkable, and the requirements of the high-end industrial field for the whiteness and purity of the barite powder can be met.

Description

Technical Field

[0001] The present invention relates to the technical field of barite powder purification, and particularly relates to a barite powder purification and whitening process. Background Art

[0002] As an important industrial mineral raw material, the application value of barite is closely related to its whiteness and purity. Barite powder is a mineral powder processed from natural barite through processes such as crushing, grinding, and flotation. Its main component is barium sulfate (purity ≥ 97%) 34. It has stable chemical properties, is insoluble in water and hydrochloric acid, is non-toxic and non-magnetic, and is a typical non-metallic industrial mineral material.

[0003] Barite powder has a wide range of applications in many industrial fields. Its whiteness and purity have an important impact on product quality and market value. However, barite ore is often contaminated by impurities during mining and processing, resulting in a decrease in its whiteness and purity and affecting the competitiveness of products. Traditional barite powder whitening methods have problems such as unsatisfactory whitening effects, complex processes, and high costs. Summary of the Invention

[0004] In view of the above problems that existing barite ore is often contaminated by impurities during mining and processing, resulting in a decrease in its whiteness and purity and affecting the competitiveness of products, and traditional barite powder whitening methods have problems such as unsatisfactory whitening effects, complex processes, and high costs, the present invention is proposed.

[0005] Therefore, the object of the present invention is to provide a barite powder purification and whitening process, which aims to: through the organic combination of magnetic separation for impurity removal and bleaching process, effectively remove impurities and colored substances in barite powder, significantly improve its whiteness and purity, optimize the dosage of reagents and reaction conditions, determine the optimal process conditions by precisely controlling key parameters such as pulp concentration, temperature, reagent dosage, and reaction time, ensure the stability and repeatability of the whitening effect, and at the same time reduce production costs and improve production efficiency.

[0006] To solve the above technical problems, the present invention provides the following technical solution: A barite powder purification and whitening process, comprising the following steps: Step 1, Preparation: Select barite powder with uniform mesh number and similar whiteness for standby; Step 2, Magnetic Separation for Impurity Removal: Use a 1.4T strong magnetic separation process to remove impurities from barite powder to obtain concentrate. Through magnetic separation, magnetic impurities in the ore sample are effectively removed, laying a good foundation for the subsequent bleaching process; Step 3, Bleaching: S1. Adjust the pulp concentration: Add concentrate into a thermostatic reactor and inject water to make pulp. Adjust the pulp concentration to 25 - 35%. This concentration is the optimal concentration determined through multiple experiments, which can not only ensure the effective action of the reagent but also prevent the bleaching effect from being affected by too high or too low concentration; S2. Add Reagent P-1: The dosage is 1500 - 2500 g / t. Reagent P-1 is mainly used to adjust the pH value of the pulp, and adjust the pH value to between 8 and 9 to create a suitable pH environment for subsequent bleaching reactions and ensure that the bleaching reagent can fully play its role; S3. Add Reagent P-2: The dosage is 4 - 8% (calculated based on dry ore powder). Reagent P-2 is a bleaching agent, and its main component is sodium sulfite. It can effectively remove impurities and colored substances in barite powder and significantly improve the whiteness. At a temperature of 55 - 65 °C and a reaction time of 2 - 4 hours, these temperature and time are optimized through multiple experiments, which can ensure the bleaching effect while avoiding resource waste and whiteness decline caused by overreaction; S4. Add Reagent P-6: The dosage is 1 - 2% (calculated based on dry ore powder). Reagent P-6 has the functions of adsorbing impurities and performing ion exchange, which can further improve the whiteness of the pulp and remove impurity ions affecting whiteness; The reaction time is 30 - 60 minutes, which is the optimal time determined through experiments and can enable Reagent P-6 to fully play its role without negative impacts; S5. Filtration: After the above treatment, filter to obtain a qualified whitened barite powder product.

[0007] As a preferred embodiment of the barite powder purification and whitening process described in the present invention, wherein: in step S2, Reagent P-1 is a reagent for adjusting the pH value of the pulp, Reagent P-2 is a bleaching agent, and the main component of the bleaching agent is sodium sulfite. Reagent P-6 is a reagent for adsorbing impurities and performing ion exchange, and the main component of Reagent P-6 is activated carbon.

[0008] As a preferred embodiment of the barite powder purification and whitening process described in the present invention, wherein: in the verification experiment, adjust the reagent dosage according to different ore sample characteristics, specifically: For muddy ore with more impurities, the dosage of P-1 is 2000 g / t, the dosage of P-2 is 8%, and the dosage of P-6 is 2.5%; For ore sample 3815 with whiteness and impurities similar to ore sample 3306, the dosage of P-1 is 2000 g / t, the dosage of P-2 is 6%, and the dosage of P-6 is 1.5%; For ore sample 4210 with better whiteness and fewer impurities, the dosage of P-2 is 3%, and the dosage of P-6 is 1.0%.

[0009] As a preferred embodiment of the barite powder purification and whitening process of the present invention, wherein: the pulp concentration is controlled at 30% to ensure that the reagent fully contacts the ore sample and plays the best role.

[0010] As a preferred embodiment of the barite powder purification and whitening process of the present invention, wherein: the bleaching reaction temperature is controlled at 60 °C to improve the bleaching effect and make the whiteness of the barite powder reach the best level.

[0011] As a preferred embodiment of the barite powder purification and whitening process of the present invention, wherein: the reaction time of the P-2 reagent is 3 hours, and the reaction time of the P-6 reagent is 45 minutes to ensure that the reagent fully acts and improves the whiteness.

[0012] Advantages of the present invention: 1. Through the organic combination of magnetic separation impurity removal and bleaching process, the present invention effectively removes impurities and colored substances in the barite powder, significantly improving its whiteness and purity. The whiteness of the 3306 ore sample can be increased from 61.0% to 80.7%, and the whiteness of the 4210 ore sample can be increased from 73.8% to 90.2%. The whitening effect is significant and can meet the requirements of the high-end industrial field for the whiteness and purity of barite powder.

[0013] 2. The present invention optimizes the dosage of the reagent and the reaction conditions. By precisely controlling key parameters such as pulp concentration, temperature, reagent dosage, and reaction time, the optimal process conditions are determined, ensuring the stability and repeatability of the whitening effect. At the same time, the production cost is reduced and the production efficiency is improved.

[0014] 3. The process of the present invention is simple to operate and easy to be applied industrially. The reagents used are all common chemical reagents, with wide sources and reasonable prices. Moreover, the process flow is not complex and the requirements for equipment are not high, making it suitable for application in productions of different scales. It provides an efficient and economical whitening solution for the production of barite powder, helping to enhance the market competitiveness and economic benefits of the enterprise.

[0015] 4. The process of the present invention has good universality. By adjusting the reagent dosage and process parameters, it can adapt to barite ore samples of different types, different impurity contents, and different initial whitenesses, with a wide application range and can meet diverse production requirements. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings. Among them: Figure 1Table of mineral composition analysis for the barite powder purification and whitening process of the present invention (showing the content of various mineral components in the clay ore, 3306, 3815, and 4210 ore samples, such as the proportion of calcite, quartz, etc. in different ore samples).

[0017] Figure 2 X-ray diffraction pattern of the clay ore mineral composition for the barite powder purification and whitening process of the present invention (through the position and intensity of the diffraction peaks, the crystal structure and composition characteristics of various minerals in the clay ore can be analyzed).

[0018] Figure 3 X-ray diffraction pattern of the 3306 mineral composition for the barite powder purification and whitening process of the present invention (used to analyze the mineral crystal structure and composition information of the 3306 ore sample).

[0019] Figure 4 X-ray diffraction pattern of the 3815 mineral composition for the barite powder purification and whitening process of the present invention (showing the mineral composition and crystal structure characteristics of the 3815 ore sample).

[0020] Figure 5 X-ray diffraction pattern of the 4210 mineral composition for the barite powder purification and whitening process of the present invention (presenting the crystal structure characteristics of the mineral composition of the 4210 ore sample).

[0021] Figure 6 Table of iron content analysis results for the barite powder purification and whitening process of the present invention (listing the content of Fe2O3 in the clay ore, 3306, 3815, and 4210 ore samples, reflecting the difference in the content of iron impurities affecting whiteness in different ore samples).

[0022] Figure 7 Table of whiteness test results for the barite powder purification and whitening process of the present invention (recording the initial whiteness of the clay ore, 3306, 3815, and 4210 ore samples and the change in whiteness after treatment).

[0023] Figure 8 Flow chart of the magnetic separation exploration test for the barite powder purification and whitening process of the present invention (detailedly showing the steps and process of the magnetic separation exploration test, including ore sample preparation, magnetic separation operation, product collection, etc.).

[0024] Figure 9 Flow chart of the bleaching concentration exploration test for the barite powder purification and whitening process of the present invention (presenting the process of the whitening test at different pulp concentrations, including concentration adjustment, reagent addition, reaction, and detection, etc.).

[0025] Figure 10 Flow chart of the bleaching concentration condition test for the barite powder purification and whitening process of the present invention (specifically showing the test process under different pulp concentration conditions with other process parameters remaining unchanged).

[0026] Figure 11 It is the flowchart of the bleaching P-1 condition test for the barite powder purification and whitening process of the present invention (used to illustrate the test process under different dosages of P-1 agent, including the change of agent addition amount, reaction and detection processes when other conditions are fixed).

[0027] Figure 12 It is the flowchart of the bleaching P-2 condition test for the barite powder purification and whitening process of the present invention (showing the test process carried out under different dosages of P-2 agent, including dosage adjustment, reaction and whiteness detection, etc.).

[0028] Figure 13 It is the flowchart of the hydrogen peroxide addition test for the barite powder purification and whitening process of the present invention (presenting the test process in the case of adding hydrogen peroxide assistant, including the addition amount of hydrogen peroxide, the dosage of other agents and reaction conditions, etc.).

[0029] Figure 14 It is the flowchart of the bleaching P-5 agent exploration test for the barite powder purification and whitening process of the present invention (used to illustrate the test process of the P-5 agent exploration test, including the addition of P-5 agent, the cooperation of other agents and reaction detection, etc.).

[0030] Figure 15 It is the flowchart of the bleaching P-2 agent time condition test for the barite powder purification and whitening process of the present invention (showing the test process under different reaction times of P-2 agent, including time change, reaction and whiteness detection processes when other conditions are fixed).

[0031] Figure 16 It is the flowchart of the bleaching P-3 agent dosage condition test for the barite powder purification and whitening process of the present invention (presenting the test process under different dosages of P-3 agent, including dosage adjustment, reaction and whiteness detection, etc.).

[0032] Figure 17 It is the flowchart of the bleaching P-6 agent exploration test for the barite powder purification and whitening process of the present invention (used to illustrate the test process of the P-6 agent exploration test, including the addition of P-6 agent, the cooperation of other agents and reaction detection, etc.).

[0033] Figure 18 It is the flowchart of the bleaching temperature exploration test for the barite powder purification and whitening process of the present invention (showing the test process of whitening test under different temperatures, including temperature change, agent addition and reaction detection, etc.).

[0034] Figure 19 It is the flowchart of the bleaching temperature condition test for the barite powder purification and whitening process of the present invention (specifically presenting the test process under different temperature conditions when other process parameters remain unchanged).

[0035] Figure 20 This is the flow chart of the bleaching temperature condition test for the barite powder purification and whitening process of the present invention (emphasizing again the test process under different temperature conditions, which Figure 19 complements each other to more comprehensively show the influence of temperature on the process).

[0036] Figure 21 This is the flow chart of the bleaching P-6 dosage condition test for the barite powder purification and whitening process of the present invention.

[0037] Figure 22 This is the flow chart of the bleaching P-6 condition test for the barite powder purification and whitening process of the present invention.

[0038] Figure 23 This is the flow chart of the optimal conditions for the barite powder purification and whitening process of the present invention.

[0039] Figure 24 This is the flow chart of the verification test for the bleaching of mud ore in the barite powder purification and whitening process of the present invention.

[0040] Figure 25 This is the flow chart of the 3815 bleaching verification test for the barite powder purification and whitening process of the present invention.

[0041] Figure 26 This is the flow chart of the 4210 bleaching verification test for the barite powder purification and whitening process of the present invention. Specific Embodiments

[0042] To make the above objects, features, and advantages of the present invention more obvious and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings of the specification.

[0043] Many specific details are set forth in the following description to facilitate a thorough understanding of the present invention, but the present invention may be practiced in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below. Example 1

[0044] Referring to Figures 1 - 26 , which is the first embodiment of the present invention, a barite powder purification and whitening process is provided. This barite powder purification and whitening process includes the following steps: Step 1, Ore Sample Preparation: Take 200 g of barite powder ore sample No. 3306 with a particle size of 2500 mesh, and its whiteness is 41%; the ore sample mainly consists of barite, calcite, and a small amount of quartz through mineral composition analysis, meeting the requirements of the treatment object of this process; Step 2, Magnetic Separation for Impurity Removal: Use a 1.4 T strong magnetic separation process to remove impurities from the barite powder to obtain concentrate; Step 3, Bleaching Test: S1. Adjust the pulp concentration: Adjust the pulp concentration to 25% to ensure the effective action of the reagent. S2. Add Reagent P-1: The dosage is 1500 g / t. Reagent P-1 is mainly used to adjust the pH value of the pulp to ensure that the bleaching reagent can fully play its role. S3. Add Reagent P-2: The dosage is 3% (calculated based on dry ore powder). Reagent P-2 is the main bleaching agent, and the dosage is 4% (calculated based on dry ore powder). The temperature is 50 °C, and the reaction time is 3 hours, which can effectively remove impurities and improve whiteness. S4. Add Reagent P-6: The dosage is 1.5% (calculated based on dry ore powder). Reagent P-6 has the functions of adsorbing impurities and ion exchange, which can further improve the whiteness of the pulp and remove impurity ions affecting whiteness. The reaction time is 20 minutes for ion exchange and adsorbing impurities to improve the whiteness of the pulp. Other contents are described in the specification. S5. Filtration: After the above treatment, filter to obtain a qualified brightening barite powder product.

[0045] In Step S2, Reagent P-1 is a reagent for adjusting the pH value of the pulp, Reagent P-2 is a bleaching agent, and the main component of the bleaching agent is sodium sulfite. Reagent P-6 is a reagent for adsorbing impurities and ion exchange, and the main component of Reagent P-6 is activated carbon. In the verification test, adjust the reagent dosage according to different ore sample characteristics, specifically: For muddy ore with more impurities, the dosage of P-1 is 2000 g / t, the dosage of P-2 is 8%, and the dosage of P-6 is 2.5%. For Ore Sample 3815 with whiteness and impurities similar to Ore Sample 3306, the dosage of P-1 is 2000 g / t, the dosage of P-2 is 6%, and the dosage of P-6 is 1.5%. For Ore Sample 4210 with better whiteness and fewer impurities, the dosage of P-2 is 3%, and the dosage of P-6 is 1.0%.

[0046] The pulp concentration is controlled at 30% to ensure full contact between the reagent and the ore sample and to play the best role.

[0047] The bleaching reaction temperature is controlled at 60 °C to improve the bleaching effect and make the whiteness of the barite powder reach the best level.

[0048] The reaction time of Reagent P-2 is 3 hours, and the reaction time of Reagent P-6 is 45 minutes to ensure the full action of the reagent and improve whiteness. Example 2

[0049] Refer to Figures 1 - 26 , which is the second embodiment of the present invention. The difference between this embodiment and the previous one is that the brightening and purification process of barite powder includes the following steps: Step 1, ore sample preparation: Take 200 g of No. 3306 barite powder ore sample with a particle size of 2500 mesh, and its whiteness is 61%; through mineral composition analysis, this ore sample mainly consists of barite, calcite and a small amount of quartz, meeting the requirements of the treatment object of this process; Step 2, magnetic separation for impurity removal: Use a 1.4 T strong magnetic separation process to remove impurities from the barite powder and obtain concentrate; Step 3, bleaching test: S1, adjust the pulp concentration: Adjust the pulp concentration to 30% to ensure the effective action of the reagent; S2, add Reagent P-1: The dosage is 2000 g / t. Reagent P-1 is mainly used to adjust the pH value of the pulp to ensure that the bleaching reagent can play its full role; S3, add Reagent P-2: The dosage is 8% (calculated based on dry ore powder). Reagent P-2 is the main bleaching agent, with a dosage of 6% (calculated based on dry ore powder), temperature 70 °C, reaction time 4 hours, which can effectively remove impurities and increase whiteness; S4, add Reagent P-6: The dosage is 3% (calculated based on dry ore powder). Reagent P-6 has the functions of adsorbing impurities and performing ion exchange, which can further increase the whiteness of the pulp and remove impurity ions affecting whiteness; the reaction time is 45 minutes for ion exchange, adsorbing impurities to increase the whiteness of the pulp, and other contents are shown in the specification; S5, filtration: After the above treatment, filter to obtain a qualified whitened barite powder product. Example 3

[0050] Refer to Figures 1 - 26 , which is the third embodiment of the present invention. The difference between this embodiment and the previous one is that this barite powder purification and whitening process includes Step 1, ore sample preparation: Take 200 g of No. 3306 barite powder ore sample with a particle size of 2500 mesh, and its whiteness is 61%. Through mineral composition analysis, this ore sample mainly consists of barite, calcite and a small amount of quartz, meeting the requirements of the treatment object of this process; Step 2, magnetic separation for impurity removal: Use a 1.4 T strong magnetic separation process to remove impurities from the barite powder and obtain concentrate. Through magnetic separation, magnetic impurities in the ore sample are effectively removed, laying a good foundation for the subsequent bleaching process; Step 3, bleaching test: S1, adjust the pulp concentration: Adjust the pulp concentration to 30%. This concentration is the optimal concentration determined through multiple tests, which can not only ensure the effective action of the reagent but also not affect the bleaching effect due to too high or too low concentration; S2, add Reagent P-1: The dosage is 2000 g / t. Reagent P-1 is mainly used to adjust the pH value of the pulp to make it reach the suitable pH environment for subsequent bleaching reactions, ensuring that the bleaching reagent can play its full role; S3. Add P-2 reagent: The dosage is 6% (calculated based on dry ore powder). P-2 reagent is the main bleaching agent, which can effectively remove impurities and colored substances in barite powder and significantly improve whiteness. React at 60 °C for 3 hours. This temperature and time are optimized through multiple experiments, which can ensure the bleaching effect while avoiding resource waste and whiteness decline caused by overreaction; S4. Add P-6 reagent: The dosage is 1.5% (calculated based on dry ore powder). P-6 reagent has the functions of adsorbing impurities and performing ion exchange, which can further improve the whiteness of the pulp and remove impurity ions affecting whiteness; The reaction time is 45 minutes, which is the optimal time determined through experiments and can enable P-6 reagent to fully play its role without negative impacts; S5. Filtration: After the above treatment, filter to obtain qualified brightened barite powder products.

[0051] 1. The experimental samples are barite powders mined and processed, with relatively fine particle sizes (400 mesh for mud ore, 2500 mesh for No. 3306, 800 mesh for No. 3815, 1250 mesh for No. 4210). The samples are mainly composed of barite, calcite and a small amount of quartz through mineral composition analysis. After whiteness analysis and testing, the whiteness of mud ore is 32.9%, the whiteness of No. 3306 is 61.0%, the whiteness of No. 3810 is 62.3%, and the whiteness of No. 4210 is 73.8%. This experiment focuses on the brightening test research of No. 3306 barite powder, and the other three samples are used for verification tests; According to the characteristics of the raw material minerals, magnetic separation for impurity removal and bleaching process exploration tests are carried out, and it is determined that the suitable process for brightening this barite powder is the bleaching process.

[0052] 2.1 The mineral composition analysis table is shown in (see in detail Figures 1 - 5 ); 2.2 The iron content analysis is shown in Figure 6 the table. The iron content analysis results show that the main substance affecting whiteness in the samples is iron oxide; 2.3. The whiteness test is shown in Figure 7 the table. The whiteness test results show that the whiteness of mud ore is the worst, the whiteness of No. 3815 and No. 3306 is better, and the whiteness of No. 4210 is relatively the best.

[0053] 3. Laboratory magnetic separation exploration test 3.1 Laboratory magnetic separation exploration test The process is shown in Figure 8 and the test results are shown in Table 3-1 as follows:

[0054]

[0055] Through the magnetic separation exploration test under the condition of 1.4T strong magnetic field and the analysis of the results in Table 3-1, the effect of the magnetic separation process on reducing iron and whitening the barite powder has basically not changed. Therefore, magnetic separation is not suitable for reducing iron and whitening this type of ore.

[0056] 3.2 Laboratory Reagent Bleaching Exploration Test In this test, the bleaching test was mainly carried out on sample 3306. The test method: use P- to adjust the pulp pH value, P-2 and P-4 for bleaching comparison tests, and P-3 for adsorption ion exchange. The process is shown in Figure 9 And the test results are shown in Table 3-2 as follows:

[0057]

[0058] Through the bleaching reagent comparison exploration test and the analysis of the results in Table 3-2, the bleaching process is superior to the magnetic separation process. The P-2 reagent has a better effect on reducing the iron content and whitening the barite powder. Therefore, the bleaching process is adopted and the P-2 bleaching reagent is selected.

[0059] 3.3 Determination of the Test Scheme After summarizing the results of the magnetic separation, bleaching process and bleaching reagent comparison exploration tests: 1) The effect of the bleaching process is superior to the magnetic separation process; 2) Through the comparison test of P-2 and P-4 reagents, the effect of the P-2 reagent is better; Based on the above, in order to achieve the target index, the bleaching process is determined to be adopted and the P-2 reagent is selected. 4.1 Bleaching Concentration Test Take 4 samples for bleaching test, each sample is 200g, the pulp concentrations are 20%, 30%, 40%, 50% respectively, the dosage of P-1 is 1000g / t, the dosage of P-2 is 1.5% (calculated based on dry ore powder), and the dosage of P-3 is 0.75% (calculated based on dry ore powder). Conduct the concentration condition test. The process is shown in Figure 10 And the test results are shown in Table 4-1 as follows:

[0060]

[0061] According to the test results in Table 4-1, it can be seen that as the pulp concentration increases, the whiteness gradually increases, and the whiteness is the highest at 30% concentration. Subsequently, the whiteness begins to decrease at 40% concentration. Therefore, the pulp concentration of 30% is selected for the subsequent test.

[0062] 4.2 Bleaching P-1 Reagent Dosage Condition Test Take 4 samples for bleaching tests, with each sample weighing 200 g, a pulp concentration of 30%, P-1 dosages of 500 g / t, 1000 g / t, 2000 g / t, and 3000 g / t respectively, a P-2 dosage of 1.5%, and a P-3 dosage of 0.75%. Conduct condition tests on the dosage of P-1 reagent. The process is shown in Figure 11 And the test results are shown in Table 4-2 as follows:

[0063]

[0064] According to the test results in Table 4-2, as the dosage of P-1 reagent increases, the whiteness gradually increases. The whiteness is the highest when the dosage of P-1 reagent is 2000 g / t and then decreases. Therefore, select a P-1 reagent dosage of 2000 g / t for subsequent tests.

[0065] 4.3 Condition Tests on the Dosage of Bleaching P-2 Reagent Take 6 samples for bleaching tests, with each sample weighing 200 g, a pulp concentration of 30%, a P-1 dosage of 2000 g / t, P-2 dosages of 1%, 1.5%, 2%, 4%, 6%, and 8% (calculated based on dry ore powder) respectively, and a P-3 dosage of 0.75%. Conduct condition tests on the dosage of P-2 reagent. The process is shown in Figure 12 And the test results are shown in Table 4-3 as follows:

[0066]

[0067] According to the test results in Table 4-3, as the dosage of P-2 reagent increases, the whiteness gradually increases. The whiteness is the highest when the dosage of P-2 reagent is 6% and then slightly decreases. Therefore, select a P-2 reagent dosage of 6% for the test.

[0068] Supplementary test: Take 200 g of sample, with a pulp concentration of 30%, a P-1 dosage of 2000 g / t, P-2 dosages of 8%, 2% hydrogen peroxide (30% hydrogen peroxide concentration), and a P-3 dosage of 0.75%. Conduct condition tests on the dosage of P-2 reagent. The process is shown in Figure 13 And the test results are shown in Table 4-4 as follows:

[0069]

[0070] According to the test results in Table 4-4, after adding the hydrogen peroxide additive for bleaching, the whiteness of the ore powder does not change. Therefore, the use of hydrogen peroxide is not considered subsequently.

[0071] 4.4 Exploratory Tests on Bleaching P-5 Reagent Take 1 sample for the bleaching test. Each sample weighs 200 g, the pulp concentration is 30%, the dosage of P-1 is 2000 g / t, the dosage of P-5 is 3% (calculated based on dry ore powder, P-5 is a mixed reagent), and the dosage of P-3 is 0.75%. Conduct an exploratory test on the P-5 reagent. The process is shown in Figure 14 And the test results are shown in Table 4-5 as follows:

[0072]

[0073] According to the test results in Table 4-5, the effect of the P-5 reagent on the 3306 barite powder test is not obvious, and it is not as obvious as that of the P-2 reagent.

[0074] 4.5 Bleaching Time Condition Test of P-2 Reagent Take 7 samples for the bleaching test. Each sample weighs 200 g, the pulp concentration is 30%, the dosage of P-1 is 2000 g / t, the dosage of P-2 is 6% (calculated based on dry ore powder), and the dosage of P-3 is 0.75%. Conduct a stirring time condition test on the P-2 reagent. The process is shown in Figure 15 And the test results are shown in Table 4-6 as follows:

[0075]

[0076] According to the test results in Table 4-6, as the time of the P-2 reagent increases, the whiteness first increases, and then begins to gradually decrease at 3 hours. When the time of the P-2 reagent is 3 hours, the whiteness is the best. Therefore, 3 hours is selected as the best bleaching time of the P-2 reagent.

[0077] 4.6 Dosage Condition Test of P-3 Reagent Take 4 samples for the bleaching test. Each sample weighs 200 g, the pulp concentration is 30%, the dosage of P-1 is 2000 g / t, the dosage of P-2 is 6% (calculated based on dry ore powder), and the dosages of P-3 are 0.5%, 0.75%, 1.5%, and 3% respectively. Conduct a dosage condition test on the P-3 reagent. The process is shown in 16 and the test results are shown in Table 4-7 as follows:

[0078]

[0079] According to the test results in Table 4-7, as the dosage of the P-3 reagent increases, the whiteness increases. When the dosage of the P-3 reagent is 1.5%, the change in whiteness is basically small. Therefore, the best dosage of the P-3 reagent is selected as 1.5%.

[0080] Two problems were found through previous tests: 1) The effect of P-3 reagent in exchanging impurities in P-2 bleaching solution was not significant. After consulting the data, it was found that P-6 reagent had an effect in the barite bleaching process; 2) By analyzing the temperature changes and whiteness data in the previous test process, it was found that temperature also had a certain influence on bleaching. Therefore, additional tests on P-6 reagent and heating and stirring tests were conducted. (1) Conduct additional exploratory tests on P-6 reagent Take 1 sample for bleaching test, each sample is 200g, the pulp concentration is 30%, the dosage of P-1 is 2000g / t, the dosage of P-2 is 6% (calculated based on dry ore powder), and the dosages of P-6 are 1.5% respectively. Conduct P-6 reagent tests. The process is shown in Figure 17 And the test results are shown in Table 4-8 as follows:

[0081]

[0082] According to the test results in Table 4-8, at the same temperature, the effect of P-6 reagent is significantly better than that of P-3. Therefore, P-6 reagent was selected for subsequent use.

[0083] (2) Conduct additional temperature exploratory tests Take 1 sample for bleaching test, each sample is 200g, the pulp concentration is 30%, the dosage of P-1 is 2000g / t, the dosage of P-2 is 6% (calculated based on dry ore powder), and the dosages of P-3 are 1.5% respectively. Conduct temperature exploratory tests at 50°C. The process is shown in Figure 18 And the test results are shown in Table 4-9 as follows:

[0084]

[0085] According to the test results in Table 4-9, at a higher temperature (50°C), the bleaching effect of barite powder is much better than at room temperature (the temperature in Shimen is 10-23°C). Therefore, temperature test research will be carried out in the next step.

[0086] 4.7 Bleaching temperature condition test Take 5 samples for bleaching temperature test, each sample is 200g, the pulp concentration is 30%, the dosage of P-1 is 2000g / t, the dosage of P-2 is 6% (calculated based on dry ore powder), and the dosage of P-6 is 1.5%. Select temperatures of 30°C, 40°C, 50°C, 60°C, and 70°C for the test. The process is shown in Figure 19 And the test results are shown in Table 4-10 as follows:

[0087]

[0088] According to the test results in Table 4-10, as the temperature increases, the whiteness of the product gradually increases. When the temperature is 60°C, the whiteness is the best. Subsequently, as the temperature increases, the whiteness decreases. Therefore, the optimal test temperature is selected as 60°C.

[0089] 4.8 Supplementary P-2 dosage reduction test at 60 °C Take 3 samples for P-2 dosage reduction test, 200 g for each sample. Conduct the supplementary test at 60 °C, pulp density is 30%, P-1 dosage is 2000 g / t, reduce P-2 dosages by 2%, 3%, 4% respectively (calculated based on dry ore powder), P-6 dosage is 1.5%. The process is shown in Figure 20 And the test results are shown in Table 4-11 as follows:

[0090]

[0091] According to the test results in Table 4-11, after reducing the dosage of the reagent, the whiteness of the product changes significantly. The reduction is most significant when the dosages are 2% and 3%. The whiteness of the product is close to 80% when the dosage is 4%. Therefore, from the results of the previous normal temperature test and heating test, the reaction of this 3306 barite powder basically starts when the P-2 dosage is 4%, and the whiteness improvement is the most obvious.

[0092] 4.9 Bleaching P-6 reagent dosage condition test Take 5 samples for bleaching test, 200 g for each sample. Pulp density is 30%, P-1 dosage is 2000 g / t, P-2 dosage is 6% (calculated based on dry ore powder), P-6 dosages are 0.5%, 1%, 1.5%, 2.5%, 4% respectively. Conduct the P-6 reagent dosage condition test. The process is shown in Figure 21 And the test results are shown in Table 4-12 as follows:

[0093]

[0094] According to the test results in Table 4-12, as the dosage of P-6 increases, the whiteness gradually increases. The whiteness is the highest when the P-6 dosage is 1.5%, and then it decreases slightly. Therefore, select the P-6 dosage as 1.5%.

[0095] 4.10 Bleaching P-6 time condition test Take 4 samples for bleaching test, 200 g for each sample. Pulp density is 30%, P-1 dosage is 2000 g / t, P-2 dosage is 6% (calculated based on dry ore powder), P-6 dosage is 1.5%. Conduct the P-6 reagent time condition test. The process is shown in Figure 22 And the test results are shown in Table 4-13 as follows:

[0096]

[0097] According to the test results in Table 4-13, the whiteness gradually increases with the increase of time. When the time is 45 minutes, the whiteness is the highest, and then it decreases slightly. Therefore, the optimal stirring time for Agent P-6 is selected as 45 minutes.

[0098] 4.11 Summary of Tests on Ore Sample 3306 Through the experimental studies on conditions such as the pulp concentration, agent dosage, time, and temperature of 3306 barite powder ore, the final analysis of the test results shows that the optimal conditions are as Figure 23 shown in Table 4-14:

[0099]

[0100] 1) The particle size of this ore is relatively fine. During the test process, it is found that the bleaching effect is not good when the pulp concentration is too high or too low. After testing, 30% is found to be more appropriate; 2) When the pulp conditioner P-1 is 2000 g / t, Agent P-2 has the best bleaching effect; 3) After multiple exploration tests on bleaching agents, it is found that P-2 has the best effect. Through the experimental study on the dosage conditions of Agent P-2, the results show that the change in the bleaching effect is relatively large when the agent dosage starts from 4%, and the effect is the best when the dosage is 6%. When the dosage is increased for testing, the whiteness begins to decrease; 4) Through multiple exploration tests on bleaching consolidation agents, it is found that P-6 has the best effect. It can maintain the whiteness of the pulp, exchange and react impurities affecting the whiteness, etc. Through the dosage test, the results show that the best effect is achieved when the dosage of P-6 is 1.5%; 5) By analyzing the data and comparing with the recent temperature difference, it is found that there is a certain relationship between this test and temperature. Through the water bath heating test, it is found that at a certain temperature, the whiteness of barite powder increases significantly. Through the temperature condition test, the whiteness is the best at 60°C; 6) Through the time condition tests of P-2 and P-6, the best bleaching times are 3 hours and 45 minutes respectively.

[0101] 5. Verification Tests on Clay Ore and 3815 / 4210 Barite Powder 5.1 Verification Test on Clay Ore Take 1 clay ore sample for bleaching test. The sample is 200 g, and the pulp concentration is 30%. Since the clay ore contains more impurities, the agent dosage is relatively large. The dosage of P-1 is 2000 g / t, the dosage of P-2 is 8% (calculated based on dry ore powder), and the dosage of P-6 is 2.5%. See the process Figure 24 and Test Result Table 5-1 as follows:

[0102]

[0103] According to the analysis of the test results in Table 5-1, the dosage of the mud ore agent is relatively large, and the increase in whiteness is also relatively large, increasing from 32.9% of the incoming sample to 65.6%, with obvious effects. However, the bleaching cost is relatively high.

[0104] 5.2 Verification Test of Ore Sample 3815 Take 1 portion of the 3815 sample for bleaching test. The sample is 200 g, and the pulp concentration is 30%. Since the whiteness and impurities of the 3815 ore sample and the 3306 ore sample are relatively similar, the agent dosage is the same as that of 3306. The dosage of P-1 is 2000 g / t, the dosage of P-2 is 6% (calculated based on dry ore powder), and the dosage of P-6 is 1.5%. See the process Figure 25 And the test results in Table 5-2 are as follows:

[0105]

[0106] According to the analysis of the test results in Table 5-2, the increase in whiteness of the 3815 sample is basically the same as that of the 3306 sample, increasing from 62.3% to 79.6%.

[0107] 5.3 Verification Test of Ore Sample 4210 Take 1 portion of the 4210 sample for bleaching test. The sample is 200 g, and the pulp concentration is 30%. Since the whiteness of the 4210 ore sample is better and the impurities are less than those of the 3306 ore sample, the agent dosage is less than that of 3306. The dosage of P-1 is 2000 g / t, the dosage of P-2 is 3% (calculated based on dry ore powder), and the dosage of P-6 is 1.0%. See the process Figure 26 And the test results in Table 5-3 are as follows:

[0108]

[0109] According to the analysis of the test results in Table 5-3, the whiteness of the 4210 sample increases from 73.8% to 90.2%, and the increase in whiteness is 22.2%, with a relatively large increase range.

[0110] 6. Test Conclusions 1. The incoming samples in this test are four ore samples: mud ore, 3306, 3815, and 4210. Through the analysis of the mineral composition, the main minerals are barite, calcite, and a small amount of quartz. Therefore, acids cannot be used in the process of the whiteness increase test. For the whiteness test and analysis, the whiteness of the mud ore is the worst, the whiteness of 3306 and 3815 is better, and the whiteness of 4210 is relatively the best; 2. This test mainly carried out a detailed experimental study on overcoming the whiteness increase problem for the 3306 barite powder sample; 3. Through multiple exploratory tests on the process method, concentration, agent, temperature, and time of the 3306 barite powder sample, it is finally determined that this sample is suitable for the bleaching process. The main bleaching agents are P-1, P-2, and P-6. The dosage and time details are as followsFigures 4 - 14 ; 4. Through the verification tests on the mud ore, 3815, and 4210 samples, it is found that the higher the barium sulfate content, the less the impurity content, and the smaller the particle size of the barite powder, the better the floating effect. The whiteness can be increased by more than 20%, and the chemical agent cost is relatively reduced. 5. In view of the experimental results of this item, it is recommended to first remove iron from the barite powder by high-intensity magnetic separation and then enter the floating process, which will have a better effect on whitening and purification.

[0111] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A process for purifying and whitening barite powder, characterized in that, It includes the following steps: Step 1, Preparation: Select barite powder with uniform mesh number and similar whiteness for standby; Step 2, Magnetic separation for impurity removal: Use a 1.4T strong magnetic separation process to remove impurities from the barite powder to obtain concentrate; Step 3, Bleaching: S1, Adjust the pulp concentration: Add the concentrate into a constant temperature reactor and inject water to make pulp, and adjust the pulp concentration to 25 - 35% to ensure the effective action of the reagent; S2, Add Reagent P-1: The dosage is 1500 - 2500g / t. Reagent P-1 is mainly used to adjust the pH value of the pulp to between 8 and 9 to ensure that the bleaching reagent can fully play its role; S3, Add Reagent P-2: The dosage is 4 - 8% (calculated based on dry ore powder). Reagent P-2 is a bleaching agent, the temperature is 55 - 65°C, and the reaction time is 2 - 4 hours, which can effectively remove impurities and increase the whiteness; S4, Add Reagent P-6: The dosage is 1 - 2% (calculated based on dry ore powder). The main component of Reagent P-6 is activated carbon, and the reaction time is 30 - 60 minutes, which is used for ion exchange and adsorbing impurities to increase the whiteness of the pulp; S5, Filtration: After the above treatment, filter to obtain a qualified whitened barite powder product.

2. The barite powder purification and whitening process according to claim 1, characterized in that: In Step 3 S2, Reagent P-1 is a reagent for adjusting the pH value of the pulp, Reagent P-2 is a bleaching agent, and the main component of the bleaching agent is sodium sulfite. Reagent P-6 is a reagent for adsorbing impurities and ion exchange, and its main component is activated carbon.

3. The barite powder purification and whitening process according to claim 2, characterized in that: In the verification test, adjust the dosage of the reagent according to the characteristics of different ore samples, specifically: For the muddy ore with more impurity content, the dosage of P-1 is 2000g / t, the dosage of P-2 is 8%, and the dosage of P-6 is 2.5%; For the 3815 ore sample with whiteness and impurities similar to the 3306 ore sample, the dosage of P-1 is 2000g / t, the dosage of P-2 is 6%, and the dosage of P-6 is 1.5%; For the 4210 ore sample with better whiteness and fewer impurities, the dosage of P-2 is 3%, and the dosage of P-6 is 1.0%.

4. The barite powder purification and whitening process according to claim 3, characterized in that: The pulp concentration is controlled at 30% to ensure full contact between the reagent and the ore sample and achieve the best effect.

5. The barite powder purification and whitening process according to claim 4, characterized in that: The bleaching reaction temperature is controlled at 60°C to improve the bleaching effect and make the whiteness of the barite powder reach the best level.

6. The barite powder purification and whitening process according to claim 5, characterized in that: The reaction time of Reagent P-2 is 3 hours, and the reaction time of Reagent P-6 is 45 minutes to ensure the full action of the reagent and increase the whiteness.

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