CN116002742A - Production process for reducing calcium and magnesium content of barite powder - Google Patents

Abstract

The invention provides a production process for reducing calcium and magnesium content of barite powder, and relates to the technical field of barite. A production process for reducing the calcium and magnesium content of barite powder, which comprises the following steps: s1, adding a collecting agent and a regulating agent into barite ore powder, and performing ultrasonic treatment for 30-60min to obtain barite coarse powder; s2, adding the barite coarse powder into a hydrochloric acid solution, ball-milling for 1-3h, and filtering to obtain a barite precipitate; s3, adding mixed acid into the barite precipitate, stirring and mixing for 20-50min, washing with water, and drying to obtain barite powder; s4, mixing the barite powder, the stearic acid and the aluminate, stirring, heating, cooling, filtering and vacuum drying to obtain a finished product. The production process can effectively separate impurities such as calcium, magnesium, iron and the like in the barite powder through acid leaching-chelation, is beneficial to improving the grade of the barite powder, and can enable the barite powder to have good hydrophobicity and dispersibility.

Description

A production process for reducing calcium and magnesium content of barite powder

technical field

The invention relates to the technical field of barite, in particular to a production process for reducing the calcium and magnesium content of barite powder.

Background technique

Barite is an important mineral raw material of barium, which is mainly used in the production of barium oxide, barium carbonate, barium chloride, barium nitrate, precipitated barium sulfate, barium hydroxide, etc. High-quality barite minerals (>97%) can be directly used as fillers for paint, paper, rubber, plastics, and drilling weight materials after being ground. But most of the barite ore contains BaSO ₄ <95%, which contains CaSO ₄ , BaCO ₃ , CaCO ₃ , MgCO ₃ , Fe ₂ O ₃ and other impurities besides BaSO ₄ . The existence of these impurities seriously affects the production and application of barite mineral derivative products. Therefore, the barite mined from the mine usually needs to be refined to remove impurities. The commonly used barite removal methods include beneficiation and acid leaching.

The beneficiation method is to separate BaSO ₄ from other impurities by direct flotation after the barite raw ore is crushed, spiral chute-shaking table gravity separation, shaking table gravity separation, jigging-shaking table, jigging tailing-flotation and other processes, but The grade of barite concentrate obtained by mineral processing is generally less than 95%, and the mineral processing method cannot effectively separate CaSO ₄ , BaCO ₃ , CaCO ₃ , MgCO ₃ , Fe ₂ O ₃ and other impurities in barite ore.

Commonly used leaching agents for acid leaching are sulfuric acid, hydrochloric acid, nitric acid, oxalic acid and sulfamic acid, among which sulfuric acid is used most. CaSO ₄ , BaCO ₃ , CaCO ₃ , MgCO ₃ , Fe ₂ O ₃ and other impurities can be effectively separated by leaching with hydrochloric acid or nitric acid, but Ba ²⁺ is contained in the leaching solution, which increases the difficulty of wastewater purification, while oxalic acid and sulfamic acid Fe ₂ O ₃ can only be selectively separated and leached with sulfuric acid. Although Fe ₂ O ₃ and carbonate in the ore can be decomposed, the content of CaSO ₄ increases significantly after leaching, and the grade of concentrate is low. Moreover, the utilization rate of acid in the acid leaching method is low, the waste water treatment cost is high, and it is not conducive to environmental protection.

Contents of the invention

The object of the present invention is to provide a production process for reducing the content of calcium and magnesium in barite powder. CaSO ₄ , BaCO ₃ , CaCO ₃ , MgCO ₃ , Fe ₂ O ₃ in barite powder can be removed by acid leaching-chelation. Effective separation of impurities such as barite helps to improve the grade of barite powder, and at the same time makes barite powder have better hydrophobicity and dispersibility.

The present invention solves its technical problems by adopting the following technical solutions.

The present invention proposes a kind of production technique for reducing barite powder calcium magnesium content, comprises the following steps:

S1. Add collectors and regulators to the barite ore powder, and perform ultrasonic treatment for 30-60 minutes to obtain barite coarse powder;

S2, adding barite coarse powder into hydrochloric acid solution, ball milling for 1-3h, and filtering to obtain barite precipitation;

S3, adding mixed acid to the barite precipitation, stirring and mixing for 20-50min, washing with water, drying to obtain barite powder;

S4. Mix barite powder, stearic acid and aluminate, stir and heat, cool, filter, and vacuum dry to obtain a finished product.

Embodiments of the present invention at least have the following beneficial effects:

In the present invention, a collector and a regulator are added to the barite ore powder, and the ultrasonic treatment is performed for 30-60 minutes. Through the combined use of collectors and adjusters, the adsorption capacity of collectors to different minerals can be used to remove impurities in barite ore powder, and the adjustment agent can be used to improve or promote the adsorption capacity of collectors to minerals to improve flotation Combined with the ultrasonic treatment effect, the adsorption amount of the collector on the surface of the barite ore powder is greatly reduced, and then a better-grade barite coarse powder can be obtained. Add barite coarse powder to hydrochloric acid solution, ball mill for 1-3h, and filter. Using the acidity of hydrochloric acid, the compounds CaSO ₄ , BaCO ₃ , CaCO ₃ , MgCO ₃ , Fe ₂ O ₃ in barite coarse powder react with hydrochloric acid to generate CaCl ₂ , BaCl ₂ , MgCl ₂ and FeCl ₃ are easily soluble in Water compounds are filtered to remove calcium and magnesium ions to obtain barite precipitates with low calcium and magnesium ion content. In order to further reduce the calcium and magnesium ions in the barite precipitation, use the mixed acid to react with the residual calcium and magnesium ions in the barite precipitation to form a water-soluble complex to further improve the purity of the barite powder . Mix barite powder, stearic acid and aluminate, stir and heat, cool, filter and dry in vacuum. In this way, the barite powder can be modified to obtain barite powder with better hydrophobicity and dispersibility, which improves the application range of barite powder and is more convenient for popularization and application.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Those who do not indicate the specific conditions in the examples are carried out according to the conventional conditions or the conditions suggested by the manufacturer. The reagents or instruments used were not indicated by the manufacturer, and they were all conventional products that could be purchased from the market.

It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. Hereinafter, the present invention will be described in detail with reference to specific examples.

A production process for reducing the calcium and magnesium content of barite powder, comprising the following steps:

S1. Add collectors and regulators to the barite ore powder, and perform ultrasonic treatment for 30-60 minutes to obtain barite coarse powder;

S2, adding barite coarse powder into hydrochloric acid solution with a mass fraction of 10-15%, ball milling for 1-3 hours, and filtering to obtain barite precipitation;

S3, adding mixed acid to the barite precipitation, stirring and mixing for 20-50min, washing with water, drying to obtain barite powder;

S4. Mix barite powder, stearic acid and aluminate, stir and heat, cool, filter, and vacuum dry to obtain a finished product.

Add collectors and regulators to the barite ore powder, and ultrasonically treat it for 30-60 minutes. Through the combined use of collectors and adjusters, the adsorption capacity of collectors to different minerals can be used to remove impurities in barite ore powder, and the adjustment agent can be used to improve or promote the adsorption capacity of collectors to minerals to improve flotation Combined with the ultrasonic treatment effect, the adsorption amount of the collector on the surface of the barite ore powder is greatly reduced, and then a better-grade barite coarse powder can be obtained. Add barite coarse powder to hydrochloric acid solution, ball mill for 1-3h, and filter. Using the acidity of hydrochloric acid, the compounds CaSO ₄ , BaCO ₃ , CaCO ₃ , MgCO ₃ , Fe ₂ O ₃ in barite coarse powder react with hydrochloric acid to generate CaCl ₂ , BaCl ₂ , MgCl ₂ and FeCl ₃ are easily soluble in Water compounds are filtered to remove calcium and magnesium ions to obtain barite precipitates with low calcium and magnesium ion content. In order to further reduce the calcium and magnesium ions in the barite precipitation, use the mixed acid to react with the residual calcium and magnesium ions in the barite precipitation to form a water-soluble complex to further improve the purity of the barite powder . Mix barite powder, stearic acid and aluminate, stir and heat, cool, filter and dry in vacuum. In this way, the barite powder can be modified to obtain barite powder with better hydrophobicity and dispersibility, which improves the application range of barite powder and is more convenient for popularization and application.

In detail, the particle size of the barite ore powder is 400-800 mesh. In this way, the collector and regulator are more conducive to contact with the barite ore powder, so as to better complete the flotation process of the barite mineral and reduce the impurities in the barite ore powder.

Specifically, the collector is sodium dodecylsulfonate, and the regulator is sodium carbonate.

The collector is a flotation agent that changes the hydrophobicity of the mineral surface and makes the floating mineral particles adhere to the air bubbles. Regulator is a kind of collector used to adjust the effect of collectors and medium conditions, including activators to promote the interaction between waste particles to be floated and collectors, pH regulators to adjust the pH of the medium, and inhibitors to control the buoyancy of non-floatable particles. Agents, dispersants that promote the dispersion of non-floating fine particles in the slurry, flocculants that make the floating fine particles in the slurry unite into larger aggregates, etc. The function of the regulator is: to adjust the effect of the collector and the mineral, to promote or inhibit the buoyancy of the mineral; to adjust the pH and ion composition of the pulp.

Through the combination of sodium dodecylsulfonate and sodium carbonate, the adsorption capacity of sodium dodecylsulfonate to different minerals is different, and the adsorption capacity of sodium dodecylsulfonate to target minerals is improved by sodium carbonate. Used together, high-quality barite minerals (BaSO ₄ >95%) can be obtained. Moreover, sodium dodecylsulfonate has low toxicity, is easily soluble in water, has good selectivity, strong collecting ability and certain air bubble performance, which is conducive to obtaining high-grade barite minerals. Sodium carbonate is easily soluble in water, does not react with barium sulfate, and is easy to remove.

In detail, the mass ratio of the mixed acid to the barite precipitate is (2.5-5.5):1, and the mixed acid is citric acid, ethylenediaminetetraacetic acid and sulfamic acid.

Citric acid (CA), also known as citric acid, is an important organic acid with a molecular formula of C ₆ H ₈ O ₇ . It is a colorless crystal, odorless, has a strong sour taste, and is easily soluble in water. Citric acid has enhanced chelating ability, and citrate has relatively strong chelating ability for iron ions and magnesium ions.

Ethylenediaminetetraacetic acid (EDTA) is an organic compound, its chemical formula is C ₁₀ H ₁₆ N ₂ O ₈ , and it is a white powder at normal temperature and pressure. It is a chelating agent that can combine with divalent metal ions such as Mg ²⁺ , Ca ²⁺ , Mn ²⁺ , and Fe ²⁺ . It forms stable water-soluble complexes with alkaline earth metals, rare earth elements and transition metals.

Aminosulfonic acid is an inorganic solid acid formed by replacing the hydroxyl group of sulfuric acid with amino group. Its chemical formula is NH ₂ SO ₃ H. It has the characteristics of non-volatility, no odor and low toxicity to human body. Its aqueous solution has the same properties as hydrochloric acid and sulfuric acid. of strong acidity.

Citric acid, ethylenediaminetetraacetic acid and sulfamic acid are combined. Under strong acidic conditions, citric acid and ethylenediaminetetraacetic acid have a higher chelating ability for calcium and magnesium ions, thereby reducing the content of calcium and magnesium ions in barite powder. At the same time, it can also improve the whiteness of barite powder.

Wherein, the mass ratio of citric acid, ethylenediaminetetraacetic acid and sulfamic acid is 1:(2-4):1.

Specifically, the amount of stearic acid is 1-5% of the mass of the barite powder, and the amount of aluminate is 2-7% of the mass of the barite powder.

Aluminate has the characteristics of high surface reactivity with inorganic fillers, light color, non-toxic, tasteless, high thermal decomposition temperature, wide edible range, no need to dilute when used, convenient packaging, transportation and use, and the price of aluminate is low ,Wide variety of sources. Stearic acid can evenly cover the surface of barite powder, forming a firm coating, and has a good affinity with organic paints. Combining aluminate and stearic acid to modify barite powder can improve the hydrophobicity and dispersibility of the surface. Generally, powder particles are easy to agglomerate, and the finer the particles, the more serious the agglomeration. Through modification, barite powder can be easily dispersed without agglomeration. When mixed with other materials, it is easy to disperse in the polymer to improve the mixing effect. Under the above ratio, the modification effect of aluminate and stearic acid on barite powder is better, which can significantly improve the activation index of the modified barite powder surface, so that it has better hydrophobicity and dispersibility.

Specifically, when stirring and heating, heat at 60-80°C for 30-60min. This can improve the activity of stearic acid and aluminate, and make it easier for stearic acid to wrap the barite powder, so that a firm coating can be formed on the surface of the barite powder to change the hydrophilicity of the barite powder.

The characteristics and performance of the present invention will be described in further detail below in conjunction with the examples.

Example 1

A production process for reducing the calcium and magnesium content of barite powder, comprising the following steps:

S1. Grinding the barite ore into powder with a particle size of 400 mesh, then adding 100kg of collector and 20kg of regulator to 1000kg of barite ore powder, the collector is sodium dodecylsulfonate, and the regulator is Sodium carbonate, ultrasonic treatment 30min, obtain barite coarse powder;

S2, adding barite coarse powder into a hydrochloric acid solution with a mass fraction of 10%, ball milling for 1 hour, and filtering to obtain barite precipitation;

S3, add mixed acid in barite precipitation, the mass ratio of mixed acid and barite precipitation is 2.5:1, and mixed acid is citric acid, ethylenediaminetetraacetic acid and sulfamic acid, and the mass ratio of several is 1:2:1, stirring and mixing for 20 minutes, washing with water, drying to obtain barite powder;

S4, mix barite powder, stearic acid and aluminate, the consumption of stearic acid is 1% of the mass of barite powder, the consumption of aluminate is 2% of the mass of barite powder, stir, heat at 60 ℃ 30min, cooling, filtering, and vacuum drying to obtain the finished product.

Example 2

A production process for reducing the calcium and magnesium content of barite powder, comprising the following steps:

S1. Grinding the barite ore into powder with a particle size of 500 meshes, then adding 110kg of collector and 30kg of regulator to 1000kg of barite ore powder, the collector is sodium dodecylsulfonate, and the regulator is Sodium carbonate, ultrasonic treatment 40min, obtain barite coarse powder;

S2, adding barite coarse powder into a hydrochloric acid solution with a mass fraction of 12%, ball milling for 2 hours, and filtering to obtain barite precipitation;

S3, add mixed acid to barite precipitation, the mass ratio of mixed acid and barite precipitation is 3:1, and mixed acid is citric acid, ethylenediaminetetraacetic acid and sulfamic acid, and the mass ratio of several is 1:3:1, stirring and mixing for 30 minutes, washing with water, drying to obtain barite powder;

S4, mix barite powder, stearic acid and aluminate, the consumption of stearic acid is 2% of the mass of barite powder, the consumption of aluminate is 3% of the mass of barite powder, stir, heat at 70 ℃ 40min, cooling, filtering, and vacuum drying to obtain the finished product.

Example 3

A production process for reducing the calcium and magnesium content of barite powder, comprising the following steps:

S1. Grinding the barite ore into powder with a particle size of 700 mesh, then adding 120kg of collector and 35kg of regulator to 1000kg of barite ore powder, the collector is sodium dodecylsulfonate, and the regulator is Sodium carbonate, ultrasonic treatment 50min, obtain barite coarse powder;

S2, adding barite coarse powder into a hydrochloric acid solution with a mass fraction of 14%, ball milling for 2.5 hours, and filtering to obtain barite precipitation;

S3, add mixed acid to barite precipitation, the mass ratio of mixed acid and barite precipitation is 4:1, and mixed acid is citric acid, ethylenediaminetetraacetic acid and sulfamic acid, and the mass ratio of several is 1:2.5:1, stirred and mixed for 40 minutes, washed with water, dried to obtain barite powder;

S4, mix barite powder, stearic acid and aluminate, the consumption of stearic acid is 4% of the mass of barite powder, the consumption of aluminate is 5% of the mass of barite powder, stir, heat at 75 ℃ 50min, cooling, filtering, and vacuum drying to obtain the finished product.

Example 4

A production process for reducing the calcium and magnesium content of barite powder, comprising the following steps:

S1. Grinding the barite ore into powder with a particle size of 800 mesh, then adding 150kg of collector and 50kg of regulator to 1000kg of barite ore powder, the collector is sodium dodecylsulfonate, and the regulator is Sodium carbonate, ultrasonic treatment 30min, obtain barite coarse powder;

S2, adding barite coarse powder into a hydrochloric acid solution with a mass fraction of 15%, ball milling for 1 hour, and filtering to obtain barite precipitation;

S3, add mixed acid in barite precipitation, the mass ratio of mixed acid and barite precipitation is 5.5: 1, and mixed acid is citric acid, ethylenediaminetetraacetic acid and sulfamic acid, and the mass ratio of several is 1:4:1, stirring and mixing for 50 minutes, washing with water, drying to obtain barite powder;

S4, mix barite powder, stearic acid and aluminate, the consumption of stearic acid is 5% of the mass of barite powder, the consumption of aluminate is 7% of the mass of barite powder, stir, heat at 80 ℃ 60min, cooling, filtering, and vacuum drying to obtain the finished product.

Comparative example 1

What this comparative example is different from embodiment 1 is that flotation is not carried out, and the production process is as follows:

S1, adding barite ore powder into a hydrochloric acid solution with a mass fraction of 10%, ball milling for 1 hour, and filtering to obtain barite precipitation;

S2, add mixed acid to barite precipitation, the mass ratio of mixed acid and barite precipitation is 2.5:1, and mixed acid is citric acid, ethylenediaminetetraacetic acid and sulfamic acid, and the mass ratio of several is 1:2:1, stirring and mixing for 20 minutes, washing with water, drying to obtain barite powder;

S3, mix barite powder, stearic acid and aluminate, the consumption of stearic acid is 1% of the mass of barite powder, the consumption of aluminate is 2% of the mass of barite powder, stir, heat at 60 ℃ 30min, cooling, filtering, and vacuum drying to obtain the finished product.

Comparative example 2

What this comparative example is different from Example 1 is that mixed acid is not added, and the production process is as follows:

S1. Grinding the barite ore into powder with a particle size of 400 mesh, then adding 100kg of collector and 20kg of regulator to 1000kg of barite ore powder, the collector is sodium dodecylsulfonate, and the regulator is Sodium carbonate, ultrasonic treatment 30min, obtain barite coarse powder;

S2. Add mixed acid to barite coarse powder, the mass ratio of mixed acid to barite precipitate is 2.5:1, the mixed acid is citric acid, ethylenediaminetetraacetic acid and sulfamic acid, and the mass ratio of these 1:2:1, stir and mix for 20 minutes, wash with water, and dry to obtain barite powder;

S3, mix barite powder, stearic acid and aluminate, the consumption of stearic acid is 1% of the mass of barite powder, the consumption of aluminate is 2% of the mass of barite powder, stir, heat at 60 ℃ 30min, cooling, filtering, and vacuum drying to obtain the finished product.

Comparative example 3

What this comparative example is different from embodiment 1 is that barite powder is not modified, and the production process is as follows:

S1. Grinding the barite ore into powder with a particle size of 400 mesh, then adding 100kg of collector and 20kg of regulator to 1000kg of barite ore powder, the collector is sodium dodecylsulfonate, and the regulator is Sodium carbonate, ultrasonic treatment 30min, obtain barite coarse powder;

S2, adding barite coarse powder into a hydrochloric acid solution with a mass fraction of 10%, ball milling for 1 hour, and filtering to obtain barite precipitation;

S3, add mixed acid in barite precipitation, the mass ratio of mixed acid and barite precipitation is 2.5:1, and mixed acid is citric acid, ethylenediaminetetraacetic acid and sulfamic acid, and the mass ratio of several is 1:2:1, stir and mix for 20 minutes, wash with water, and dry to get the finished product.

test results

1. Testing of physical and chemical properties of barite powder

According to GB/T 37041-2018 " fine barite powder " detect the physical and chemical properties of the finished product of embodiment 1-4 of the present invention and comparative example 1-3, the result is as follows:

Table 1 Physical and chemical properties

According to Table 1, it can be seen that the barite powder prepared in Examples 1-4 has better purity and whiteness.

2. Determination of calcium and magnesium content

Preparation of sample decomposition liquid: Weigh 0.3g sample and put it in a beaker, add a little water to moisten it, then add (1+1) hydrochloric acid 10mL, boil it on the electric stove, take it off, wait for the sample to dissolve and cool down, and put the Transfer the solution into a 100mL volumetric flask, rinse the beaker with distilled water, dilute to the mark with distilled water, and shake well to obtain a sample decomposition solution.

Determination of calcium: accurately pipette 5.00mL of sample decomposition solution into a 250mL conical flask, add 50mL of water, add 10mL of starch solution (10g/L), 2mL of triethanolamine (1+1), 1mL of ethylenediamine (1+1 ), 15mL of potassium hydroxide (200g/L) solution, add 0.1g of hydroxylamine hydrochloride, (shake well after adding a reagent), add a little calcein, and immediately titrate with EDTA standard solution under a black background until the green fluorescence disappears The purple-red color is the end point of the titration. Leave blank for the same conditions.

Calculation of calcium: Ca(%)=T×(V1-V0)/(m×5.0/100)×100

In the formula: T is the titer of EDTA standard titration solution to calcium, g/mL; V1 is the volume of EDTA standard titration solution consumed when measuring calcium, mL; V0 is the volume of blank EDTA standard titration solution, mL; m is The mass of the sample, g.

Determination of magnesium: accurately pipette 5.00mL of the sample decomposition solution into a 250mL conical flask, add 50mL of water, add 2mL of triethanolamine, take a small piece of wide pH test paper, add ammonia water dropwise until the test paper in the solution turns yellow, add 10mL NH ₃ -NH ₄ Cl buffer solution, add a little chrome black T indicator, and titrate with EDTA standard solution until purple red turns pure blue, which is the end point.

Calculation of magnesium: Mg(%)=T×(V2-V1)/(m×5.0/100)×1000/40×100

In the formula: T is the titer of EDTA standard titration solution to calcium, g/mL; V1 is the volume of EDTA standard titration solution consumed when measuring calcium, mL; V2 is the volume of EDTA standard titration solution consumed when measuring magnesium, mL ; m is the mass of the sample, g.

Table 2 Measurement results

group Ca(%) Mg(%) initial value 2.12 0.69 Example 1 0.02 0.01 Example 2 0.03 0.03 Example 3 <0.01 <0.01 Example 4 0.02 0.04 Comparative example 1 0.05 0.03 Comparative example 2 0.1 0.08 Comparative example 3 0.03 0.01

According to Table 2, it can be seen that the content of calcium and magnesium in the barite powder prepared in Examples 1-4 is significantly lower than that before untreatment. It shows that the treatment process of the present invention can be used to reduce the content of calcium and magnesium in barite powder.

To sum up, in the production process for reducing the calcium and magnesium content of barite powder according to the embodiment of the present invention, collectors and regulators are added to barite powder, and ultrasonic treatment is performed for 30-60 minutes. Through the combined use of collectors and adjusters, the adsorption capacity of collectors to different minerals can be used to remove impurities in barite ore powder, and the adjustment agent can be used to improve or promote the adsorption capacity of collectors to minerals to improve flotation Combined with the ultrasonic treatment effect, the adsorption amount of the collector on the surface of the barite ore powder is greatly reduced, and then a better-grade barite coarse powder can be obtained. Add barite coarse powder to hydrochloric acid solution, ball mill for 1-3h, and filter. Using the acidity of hydrochloric acid, the compounds CaSO ₄ , BaCO ₃ , CaCO ₃ , MgCO ₃ , Fe ₂ O ₃ in barite coarse powder react with hydrochloric acid to generate CaCl ₂ , BaCl ₂ , MgCl ₂ and FeCl ₃ are easily soluble in Water compounds are filtered to remove calcium and magnesium ions to obtain barite precipitates with low calcium and magnesium ion content. In order to further reduce the calcium and magnesium ions in the barite precipitation, use the mixed acid to react with the residual calcium and magnesium ions in the barite precipitation to form a water-soluble complex to further improve the purity of the barite powder . Mix barite powder, stearic acid and aluminate, stir and heat, cool, filter and dry in vacuum. In this way, the barite powder can be modified to obtain barite powder with better hydrophobicity and dispersibility, which improves the application range of barite powder and is more convenient for popularization and application.

The embodiments described above are some, not all, embodiments of the present invention. The detailed description of the embodiments of the invention is not intended to limit the scope of the claimed invention but to represent only selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Claims (7)

1. A production process for reducing the calcium and magnesium content of barite powder, which is characterized by comprising the following steps of:

s1, adding a collecting agent and a regulating agent into barite ore powder, and performing ultrasonic treatment for 30-60min to obtain barite coarse powder;

s2, adding the barite coarse powder into a hydrochloric acid solution, ball-milling for 1-3h, and filtering to obtain a barite precipitate;

s3, adding mixed acid into the barite precipitate, stirring and mixing for 20-50min, washing with water, and drying to obtain barite powder;

s4, mixing the barite powder, the stearic acid and the aluminate, stirring, heating, cooling, filtering and vacuum drying to obtain a finished product.

2. The production process for reducing the calcium magnesium content of the fine barite according to claim 1, wherein the grain size of the fine barite is 400-800 mesh.

3. The process for reducing the calcium magnesium content of barite powder according to claim 1, wherein the collector is sodium dodecyl sulfate and the regulator is sodium carbonate.

4. The production process for reducing calcium magnesium content of barite powder according to claim 1, wherein a mass ratio of the mixed acid to the barite precipitate is (2.5-5.5): 1, wherein the mixed acid is citric acid, ethylenediamine tetraacetic acid and sulfamic acid.

5. The production process for reducing the calcium magnesium content of the barite powder according to claim 4, wherein the mass ratio of the citric acid, the ethylenediamine tetraacetic acid and the sulfamic acid is 1: (2-4): 1.

6. the process for reducing the calcium magnesium content of barite powder according to claim 1, wherein in S4, the amount of stearic acid is 1-5% of the weight of the barite powder, and the amount of aluminate is 2-7% of the weight of the barite powder.

7. The process for reducing the calcium and magnesium content of barite powder according to claim 1, wherein the heating is performed at 60-80 ℃ for 30-60min while stirring.