CN109622239B - Potash feldspar fine selection method - Google Patents
Potash feldspar fine selection method Download PDFInfo
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- CN109622239B CN109622239B CN201811580429.7A CN201811580429A CN109622239B CN 109622239 B CN109622239 B CN 109622239B CN 201811580429 A CN201811580429 A CN 201811580429A CN 109622239 B CN109622239 B CN 109622239B
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Abstract
The invention discloses a method for selecting potassium feldspar, and relates to the technical field of potassium feldspar processing. The method comprises the steps of raw ore cleaning, screening, crushing, ore grinding, flotation and dewatering, wherein the flotation comprises primary flotation and secondary flotation, the primary flotation is to adjust ore sand into 25-35% of ore pulp, adjust the pH value to 3-5, add 8-11% of sesbania extract, stir, add 4-9% of coconut extract, stir until foaming, and scrape foam; the secondary flotation comprises the following steps: adjusting ore sand into ore pulp with the concentration of 35-45%, adjusting the pH value to 1-2, adding 3-5% of a medicament, stirring until foaming, scraping foam, and dehydrating; the medicament comprises sophora flower extract, eucalyptus leaf extract, tea extract and N-dodecyl biquaternary ammonium salt. The method effectively removes iron impurities and biotite in the feldspar, can produce the high-whiteness potassium feldspar powder, uses the pumice which is environment-friendly, is non-toxic and pollution-free, and obtains the potassium feldspar powder with the whiteness of more than 61 percent, which is superior to that of the traditional method.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of potassium feldspar processing, in particular to a method for selecting potassium feldspar.
[ background of the invention ]
Potassium feldspar is one of feldspar, a common feldspar mineral, and is aluminosilicate of potassium. Potassium feldspar is generally a glassy crystal, which is one of the main raw materials for manufacturing glass and ceramics. In recent years, with the rapid development of the ceramic industry and the glass industry in China, the demand for high-purity potassium feldspar is continuously increased. Iron minerals, titanium oxide, mica and quartz are main impurities of potash feldspar ore, and the mica is mainly biotite, lepidolite and biotite, so that the whiteness, dielectric property, chemical stability and the like of the ceramic are influenced.
At present, the feldspar iron removal method mainly comprises magnetic separation, acid leaching and flotation, but the magnetic separation has high requirements on equipment, the acid leaching and flotation discharge have large toxic action, and the environmental pollution is serious, for example, in the literature, "New Process research for removing iron from Potassium feldspar", Tang script, etc., "contemporary chemical engineering", 2008, 37 (5): 456-458, which is considered to be that most of iron impurities can be removed by adopting sulfuric acid for soaking at 90 ℃, and meanwhile, potassium oleate, potassium dodecyl benzene sulfonate, AES and AOS are selected as flotation reagents for continuous treatment, so that iron can be removed, but the environment is damaged by large-amount discharge of the acid solution and the flotation reagents.
The content of mica in mineral rocks is low, but the influence on the whiteness and the quality of feldspar ore is large, and the mica belongs to silicate minerals with a layered structure, is acid-alkali-resistant, stable in chemical property and difficult to remove. The method for removing the mica at the present stage mainly comprises the following steps: the mica is captured by adopting a beneficiation reagent under certain conditions, so that the mica is separated from the feldspar, the common flotation reagent is a surfactant, an ionic collecting agent and other chemical reagents, most of the reagents are toxic substances, and the environment is polluted by using and discharging a large amount of the reagents. For example, chinese patent 201710843849.9 discloses a method for producing potassium feldspar powder, which removes impurities by a series of physical methods such as raw ore cleaning, sieving, crushing, ore grinding, magnetic separation, dehydration and the like to obtain potassium feldspar with less iron and high whiteness, but does not remove mica and has low purity; for example, the research on the whitening of feldspar mineral except mica, Pangla et al, China ceramics 2015(1) (54-57) considers that a mixture of dodecylamine and octadecylamine in a mass ratio of 2:1 is used as a flotation reagent to remove mica in feldspar mineral, but dodecylamine is a toxic reagent and pollutes the environment when a large amount of dodecylamine is used and discharged, so the preparation and impurity removal method of potassium feldspar is improved according to the published documents. In addition, the content of biotite in the potassium feldspar in the congratulation areas in Guangxi is very high, the whiteness of the feldspar is seriously influenced, and a special method for removing the biotite is not available in the prior art.
[ summary of the invention ]
Aiming at the problems, the invention aims to provide a method for selecting the potassium feldspar, which can effectively remove iron impurities and biotite in the feldspar and can produce potassium feldspar powder with high whiteness, low iron and low mica, and the used pumice is environment-friendly, nontoxic and pollution-free.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a potash feldspar concentration method comprises the steps of raw ore cleaning, screening, crushing, ore grinding, flotation and dehydration, wherein the flotation comprises primary flotation and secondary flotation;
the primary flotation comprises the following steps: adding water into fine sand particles which are obtained by grinding and are not less than 200 meshes to adjust the concentration of the fine sand particles to be 25-35%, adjusting the pH value of the ore slurry to be 3-5, adding sesbania extract accounting for 8-11% of the mass of the ore slurry, stirring for 2-4min, then adding coconut extract accounting for 4-9% of the mass of the ore slurry, stirring until the mixture is foamed, scraping foam, washing with clear water, and dehydrating until the water content is not more than 25% to obtain the de-ironed ore sand;
the secondary flotation comprises the following steps: adding water into the de-ironed ore sand to adjust the concentration to 35-45% of ore pulp, adjusting the pH of the ore pulp to 1-2, adding a medicament accounting for 3-5% of the mass of the ore pulp, stirring until the ore pulp foams, scraping foams, and dehydrating until the water content is less than or equal to 15% to obtain the de-ironed ore; the medicament is mainly prepared by mixing 9-16 parts of sophora flower extract, 18-25 parts of eucalyptus leaf extract, 8-15 parts of tea extract and 9-17 parts of N-dodecyl biquaternary ammonium salt according to parts by weight.
Further, the preparation method of the sesbania extract comprises the following steps: soaking sesbania seeds in water for 6-8h, taking out, grinding for 8-10min, adding 30-40 weight times of water, mixing uniformly, centrifuging, taking supernatant, adding 20-30 weight times of ethanol solution with the mass concentration of 60-70% into the supernatant, standing until precipitate is separated out, centrifuging, taking precipitate, and vacuum drying to obtain the product.
Further, the preparation method of the coconut extract comprises the following steps: pulverizing fresh coconut meat, adding 80-90 deg.C water, grinding for 10-20min, cooling to 40-45 deg.C, adding 0.1-0.3 wt% alpha-amylase, treating for 30-50min, adding 0.1-0.3 wt% papain, continuing enzymolysis for 30-40min, filtering with filter cloth, centrifuging filtrate, and collecting supernatant.
Further, the preparation method of the sophora flower extract comprises the following steps: adding fresh sophora flower into 8-10 times of water by weight, decocting for 1-2h, filtering, concentrating the filtrate to 1/2 of the original volume, standing for 10-20h, performing suction filtration, adding the precipitate into 30-40 times of ethanol solution with the mass concentration of 85-95%, performing reflux extraction for 2-3h, and collecting the extract.
Further, the preparation method of the eucalyptus leaf extract comprises the following steps: oven drying fresh folium Eucalypti Globueli at 40-50 deg.C to constant weight, pulverizing, sieving with 20-40 mesh sieve to obtain coarse powder, distilling the coarse powder and water in a distiller for 3-4 hr, collecting oil phase, freezing the collected oil at-20 deg.C to-15 deg.C for 1-2 hr, centrifuging, and heating and melting the solid.
Further, the preparation method of the tea extract comprises the following steps: grinding tea leaves, adding 20-30 times of water by weight, heating to 70-85 ℃, keeping the temperature unchanged, leaching for 2-3h, cooling, performing suction filtration, adding filtrate into 0.1mol/L equivalent aluminum chloride solution, adjusting the pH to 5-6, standing until precipitate is generated, performing suction filtration, dissolving the precipitate in 0.018mol/L hydrochloric acid solution, extracting with ethyl acetate for 10-20min, collecting extract liquor, distilling and recovering ethyl acetate, and collecting residual solids.
Preferably, the medicament is mainly prepared by mixing 11 parts of sophora flower extract, 20 parts of eucalyptus leaf extract, 10 parts of tea extract and 15 parts of N-dodecyl biquaternary ammonium salt according to parts by weight.
Compared with the prior art, the invention has the following beneficial effects:
1. the flotation method is improved, so that iron impurities and biotite in feldspar are effectively removed, the potassium feldspar powder with high whiteness, low iron and low mica can be produced, the used flotation reagent is environment-friendly, non-toxic and pollution-free, the whiteness of the obtained potassium feldspar powder is over 61%, and compared with the traditional flotation method, the used reagent is non-toxic and pollution-free and is environment-friendly.
2. The invention adopts twice flotation method to remove impurities, in one flotation, sesbania extract is mixed with ore pulp, the sesbania extract acts on feldspar particles to increase the wettability of the feldspar particles and improve the hydrophilicity of the feldspar particles, so that the feldspar particles are not easy to attach to air bubbles, then coconut extract is added, the coconut extract can be foamed and also can attach to the surfaces of iron particles to enhance the hydrophobic property of the coconut extract, so that the iron particles are adhered to the air bubbles and are removed, therefore, the sesbania extract and the coconut extract act together to effectively remove iron impurities in the feldspar. In the secondary flotation, the sophora flower extract can ensure that the surface of the biotite has small wettability and is easy to float, the floatability of the biotite is promoted, and the adhesion of bubbles to the biotite is improved; the folium Eucalypti Globueli extract can improve foaming effect; the tea extract can precipitate feldspar particles, reduce the floatability of the feldspar particles and reduce the adhesion of air bubbles to the feldspar particles; the N-dodecyl biquaternary ammonium salt is a nontoxic cationic surfactant and can adsorb mica particles; therefore, the sophora flower extract, the eucalyptus leaf extract, the tea leaf extract and the N-dodecyl biquaternary ammonium salt have synergistic effect, so that the adhesion strength between the bubbles and the biotite is improved, the adhesion strength between the bubbles and the feldspar is reduced, the trapping property and the selectivity of the medicament are enhanced, and the biotite in the feldspar ore is effectively removed. And each medicament is nontoxic, has wide sources and low cost, and is suitable for popularization and use.
[ detailed description ] embodiments
The following examples are provided to further illustrate the embodiments of the present invention.
Example 1
The potash feldspar concentration method comprises the steps of raw ore cleaning, screening, crushing, ore grinding, flotation and dehydration, wherein the flotation comprises primary flotation and secondary flotation;
the primary flotation comprises the following steps: adding water into 200-mesh fine sand particles obtained by grinding to obtain ore pulp with the concentration of 25%, adjusting the pH value of the ore pulp to 3, adding a sesbania extract with the mass of 8% of the ore pulp, stirring for 2min, then adding a coconut extract with the mass of 4% of the ore pulp, stirring until the mixture foams, scraping foams, washing with clear water, and dehydrating until the water content is 25% to obtain the de-iron ore sand; the sesbania polysaccharide content in the sesbania extract is 109mg/100g, and the coconut oil volume concentration in the coconut extract is 90%.
The secondary flotation comprises the following steps: adding water into the de-ironed ore sand to adjust the concentration to 35% ore pulp, adjusting the pH of the ore pulp to 1, adding a medicament accounting for 3% of the mass of the ore pulp, stirring until the ore pulp foams, scraping foams, and dehydrating until the water content is 15% to obtain the de-ironed ore sand; the medicament is mainly prepared by mixing 16 parts of sophora flower extract, 25 parts of eucalyptus leaf extract, 15 parts of tea extract and 17 parts of N-dodecyl biquaternary ammonium salt according to parts by weight. The content of the flos sophorae extract quercetin is 13mg/g, the volume concentration of eucalyptus oil in the eucalyptus leaf extract is 90%, and the mass percentage content of tea tannin in the tea leaf extract is 52%.
The preparation method of the sesbania extract comprises the following steps: soaking sesbania seeds in water for 6h, taking out, grinding for 8min, adding 30 weight times of water, mixing uniformly, centrifuging, taking supernatant, adding 20 weight times of ethanol solution with the mass concentration of 60% into the supernatant, standing until precipitate is separated out, centrifuging, taking the precipitate, and vacuum drying to obtain the sesbania seed extract.
The preparation method of the coconut extract comprises the following steps: pulverizing fresh coconut meat, adding 80 deg.C water, grinding for 10min, cooling to 40 deg.C, adding 0.1 wt% alpha-amylase, treating for 30min, adding 0.1 wt% papain, continuing enzymolysis for 30min, filtering with filter cloth, centrifuging filtrate, and collecting supernatant.
The preparation method of the sophora flower extract comprises the following steps: adding fresh sophora flower into 10 weight times of water, decocting for 2h, filtering, concentrating the filtrate to 1/2 of the original volume, standing for 20h, filtering, adding the precipitate into 40 weight times of 95% ethanol solution, extracting for 3h under reflux, and collecting the extract.
The preparation method of the eucalyptus leaf extract comprises the following steps: oven drying fresh folium Eucalypti Globueli at 40 deg.C to constant weight, pulverizing, sieving with 20 mesh sieve to obtain coarse powder, distilling the coarse powder and water in a distiller for 3 hr, collecting oil phase, freezing the oil at-20 deg.C for 1 hr, centrifuging, and heating and melting the solid.
The preparation method of the tea extract comprises the following steps: grinding tea leaves, adding 30 weight times of water, heating to 85 ℃, keeping the temperature unchanged, leaching for 3 hours, cooling, performing suction filtration, adding filtrate into 0.1mol/L equivalent aluminum chloride solution, adjusting the pH to 6, standing until precipitate is generated, performing suction filtration, dissolving the precipitate in 0.018mol/L hydrochloric acid solution, extracting for 20 minutes by using ethyl acetate, collecting extract liquor, distilling and recovering the ethyl acetate, and collecting residual solids.
Example 2
The potash feldspar concentration method comprises the steps of raw ore cleaning, screening, crushing, ore grinding, flotation and dehydration, wherein the flotation comprises primary flotation and secondary flotation;
the primary flotation comprises the following steps: adding water into 250-mesh fine sand particles obtained by grinding to obtain ore pulp with the concentration of 35%, adjusting the pH value of the ore pulp to 5, adding a sesbania extract accounting for 11% of the mass of the ore pulp, stirring for 4min, then adding a coconut extract accounting for 9% of the mass of the ore pulp, stirring until the mixture foams, scraping foams, washing with clear water, and dehydrating until the water content is 20% to obtain the de-iron ore sand; (ii) a The sesbania polysaccharide content in the sesbania extract is 120mg/100g, and the coconut oil volume concentration in the coconut extract is 95%.
The secondary flotation comprises the following steps: adding water into the de-ironed ore sand to adjust the concentration to 45% ore pulp, adjusting the pH of the ore pulp to 2, adding a medicament accounting for 5% of the mass of the ore pulp, stirring until the ore pulp foams, scraping foams, and dehydrating until the water content is 12% to obtain the de-ironed ore sand; the medicament is mainly prepared by mixing 9 parts of sophora flower extract, 18 parts of eucalyptus leaf extract, 8 parts of tea extract and 9 parts of N-dodecyl biquaternary ammonium salt according to parts by weight. The content of the flos sophorae extract quercetin is 10mg/g, the volume concentration of eucalyptus oil in the eucalyptus leaf extract is 90%, and the mass percentage content of tea tannin in the tea leaf extract is 49%.
The preparation method of the sesbania extract comprises the following steps: soaking sesbania seeds in water for 8h, taking out, grinding for 10min, adding 40 weight times of water, mixing uniformly, centrifuging, taking supernatant, adding 30 weight times of ethanol solution with the mass concentration of 70% into the supernatant, standing until precipitate is separated out, centrifuging, taking the precipitate, and drying in vacuum to obtain the sesbania seed extract.
The preparation method of the coconut extract comprises the following steps: pulverizing fresh coconut meat, adding 90 deg.C water, grinding for 20min, cooling to 45 deg.C, adding 0.3 wt% alpha-amylase, treating for 50min, adding 0.3 wt% papain, continuing enzymolysis for 40min, filtering with filter cloth, centrifuging filtrate, and collecting supernatant.
The preparation method of the sophora flower extract comprises the following steps: adding fresh sophora flower into 8 weight times of water, decocting for 1h, filtering, concentrating the filtrate to 1/2 of the original volume, standing for 10h, filtering, adding the precipitate into 30 weight times of 85% ethanol solution, extracting under reflux for 2h, and collecting the extract.
The preparation method of the eucalyptus leaf extract comprises the following steps: oven drying fresh folium Eucalypti Globueli at 50 deg.C to constant weight, pulverizing, sieving with 40 mesh sieve to obtain coarse powder, distilling the coarse powder and water in a distiller for 4 hr, collecting oil phase, freezing the oil at-15 deg.C for 2 hr, centrifuging, and heating to melt the solid.
The preparation method of the tea extract comprises the following steps: grinding tea leaves, adding 20 weight times of water, heating to 70 ℃, keeping the temperature unchanged, leaching for 2 hours, cooling, performing suction filtration, adding filtrate into 0.1mol/L equivalent aluminum chloride solution, adjusting the pH to 5, standing until precipitate is generated, performing suction filtration, dissolving the precipitate in 0.018mol/L hydrochloric acid solution, extracting for 10min by using ethyl acetate, collecting extract liquor, distilling and recovering the ethyl acetate, and collecting residual solids.
Example 3
The potash feldspar concentration method comprises the steps of raw ore cleaning, screening, crushing, ore grinding, flotation and dehydration, wherein the flotation comprises primary flotation and secondary flotation;
the primary flotation comprises the following steps: adding water into 300-mesh fine sand particles obtained by grinding to prepare ore pulp with the concentration of 30%, adjusting the pH value of the ore pulp to 4, adding sesbania extract accounting for 9% of the mass of the ore pulp, stirring for 3min, then adding coconut extract accounting for 6% of the mass of the ore pulp, stirring until the mixture foams, scraping foams, washing with clear water, and dehydrating until the water content is 18% to obtain the de-ironed ore sand; the sesbania polysaccharide content in the sesbania extract is 105mg/100g, and the coconut oil volume concentration in the coconut extract is 92%.
The secondary flotation comprises the following steps: adding water into the de-ironed ore sand to adjust the concentration to 40% ore pulp, adjusting the pH of the ore pulp to 1.5, adding a medicament accounting for 4% of the mass of the ore pulp, stirring until the ore pulp foams, scraping the foams, and dehydrating until the water content is 11% to obtain the de-ironed ore; the medicament is mainly prepared by mixing 11 parts of sophora flower extract, 20 parts of eucalyptus leaf extract, 10 parts of tea extract and 15 parts of N-dodecyl biquaternary ammonium salt according to parts by weight. The content of the flos sophorae extract quercetin is 12mg/g, the volume concentration of eucalyptus oil in the eucalyptus leaf extract is 90%, and the mass percentage content of tea tannin in the tea leaf extract is 48%.
The preparation method of the sesbania extract comprises the following steps: soaking sesbania seeds in water for 7h, taking out, grinding for 9min, adding 35 weight times of water, mixing uniformly, centrifuging, taking supernatant, adding 25 weight times of ethanol solution with the mass concentration of 65% into the supernatant, standing until precipitate is separated out, centrifuging, taking the precipitate, and drying in vacuum to obtain the sesbania seed extract.
The preparation method of the coconut extract comprises the following steps: pulverizing fresh coconut meat, adding equal amount of 85 deg.C water, grinding for 15min, cooling to 42 deg.C, adding 0.2% alpha-amylase by weight of coconut meat, treating for 40min, adding 0.2% papain by weight of coconut meat, continuing enzymolysis for 35min, filtering with filter cloth, centrifuging filtrate, and collecting supernatant.
The preparation method of the sophora flower extract comprises the following steps: adding fresh flos Sophorae Immaturus into 9 weight times of water, decocting for 1.5h, filtering, concentrating the filtrate to original volume of 1/2, standing for 15h, vacuum filtering, adding precipitate into 35 weight times of 90% ethanol solution, reflux extracting for 2.5h, and collecting extractive solution.
The preparation method of the eucalyptus leaf extract comprises the following steps: oven drying fresh folium Eucalypti Globueli at 45 deg.C to constant weight, pulverizing, sieving with 30 mesh sieve to obtain coarse powder, distilling the coarse powder and water in a distiller for 3.5 hr, collecting oil phase, freezing the collected oil at-18 deg.C for 1.5 hr, centrifuging, and heating and melting the solid.
The preparation method of the tea extract comprises the following steps: grinding tea leaves, adding 25 weight times of water, heating to 80 ℃, keeping the temperature unchanged, leaching for 2.5h, cooling, performing suction filtration, adding filtrate into 0.1mol/L equivalent aluminum chloride solution, adjusting the pH to 5.5, standing until precipitate is generated, performing suction filtration, dissolving the precipitate in 0.018mol/L hydrochloric acid solution, extracting for 15min with ethyl acetate, collecting extract liquor, distilling and recovering ethyl acetate, and collecting residual solids.
And (3) iron removal effect test:
control group 1: in the potash feldspar concentration method, the primary flotation (deironing) is replaced by a conventional magnetic separation method, namely ore pulp obtained by grinding ore is sequentially subjected to weak magnetic electromagnetic ore dressing equipment and strong magnetic electromagnetic ore dressing equipment to remove iron impurities, and then secondary flotation is performed to remove mica, and other steps are as follows: the steps of raw ore washing, screening, crushing, grinding, secondary flotation and dewatering were the same as in example 3.
Control group 2: in the potash feldspar concentration method, the primary flotation (deironing) is replaced by a conventional acid leaching method, namely ore sand obtained by grinding is put into a sulfuric acid solution to be soaked to remove iron impurities, and then secondary flotation is carried out to remove mica, and other steps are as follows: the steps of raw ore washing, screening, crushing, grinding, secondary flotation and dewatering were the same as in example 3.
Control group 3: in the potash feldspar selection method, the sesbania extract and the coconut extract are replaced by conventional agents in the first flotation (iron removal), the conventional agents are potassium oleate, potassium dodecyl benzene sulfonate, AES and AOS, the using dosage is the optimal dosage, then the second flotation is carried out to remove mica, and other steps are as follows: the steps of raw ore washing, screening, crushing, grinding, secondary flotation and dewatering were the same as in example 3.
Control group 4: in the potash feldspar concentration method, the agent adopted in the first flotation (iron removal) does not contain sesbania extract, but only contains coconut extract, and then the second flotation is carried out to remove mica, and other steps are as follows: the steps of raw ore washing, screening, crushing, grinding, secondary flotation and dewatering were the same as in example 3.
Control group 5: in the potash feldspar concentration method, the agent adopted in the first flotation (iron removal) does not contain coconut extract, but only contains sesbania extract, and then the second flotation is carried out to remove mica, and other steps are as follows: the steps of raw ore washing, screening, crushing, grinding, secondary flotation and dewatering were the same as in example 3.
The contents of main iron impurities (iron sesquioxide) in the ores before and after iron removal in each of example 3, control group 1 and control group 5 were respectively detected, and the results are shown in table 1:
TABLE 1 Change in the iron trioxide content before and after iron removal (wt%) for each group
From the comparison of the example 3 with the control group 1, the control group 2 and the control group 3, the method disclosed by the invention has the advantages that the iron removal efficiency is equivalent to that of magnetic separation, acid leaching and conventional agent flotation, the level of the prior art is reached, and the method is safer and more environment-friendly compared with the conventional flotation agent. From the comparison of example 3 with control 4 and control 5, it can be seen that the sesbania extract and coconut extract of the present invention synergistically enhanced to effectively remove iron impurities from feldspar.
And (3) black mica removing effect test:
comparative example 1
No chemicals were used for flotation and the other steps were the same as in example 1.
Comparative example 2
During flotation, the reagent is a conventionally used reagent, namely a mixture of dodecylamine and octadecylamine, the mass ratio is 2:1, and other steps are the same as those in example 1.
Comparative example 3
During flotation, the medicament is mainly prepared by mixing 25 parts of eucalyptus leaf extract, 15 parts of tea leaf extract and 17 parts of N-dodecyl biquaternary ammonium salt, and other steps are the same as those in example 1.
Comparative example 4
During flotation, the medicament is mainly prepared by mixing 16 parts of sophora flower extract, 25 parts of eucalyptus leaf extract and 17 parts of N-dodecyl biquaternary ammonium salt, and other steps are the same as those in example 1.
Comparative example 5
During flotation, the medicament is prepared by mixing 16 parts of sophora flower extract, 15 parts of tea extract and 17 parts of N-dodecyl biquaternary ammonium salt, and other steps are the same as those in example 1.
The whiteness (the lower the biotite content, the higher the whiteness) of the potash feldspar powder obtained in the above examples and comparative examples is shown in table 2:
table 2 comparison of whiteness of each group
| Item/group classification | Whiteness (1200 degree) |
| Example 1 | 61.9％ |
| Example 2 | 61.8％ |
| Example 3 | 62.7％ |
| COMPARATIVE EXAMPLE 1 (blank) | 33.1％ |
| COMPARATIVE EXAMPLE 2 (NORMAL) | 60.7％ |
| COMPARATIVE EXAMPLE 3 (without Sophora flower extract) | 42.1％ |
| Comparative example 4 (No tea extract) | 43.0％ |
| COMPARATIVE EXAMPLE 5 (without Eucalyptus leaf extract) | 48.3％ |
From table 2, it can be seen that:
(1) the invention improves the flotation method, effectively removes biotite in feldspar, produces high-quality potassium feldspar powder with high whiteness and low mica, and the whiteness of the obtained potassium feldspar powder is as high as 61.8-62.7%, which is higher than that of the potassium feldspar powder obtained by the traditional method (60.7%).
(2) Compared with the traditional flotation method, the used medicament is non-toxic and pollution-free and is environment-friendly.
(3) The sophora flower extract, the eucalyptus leaf extract, the tea extract and the N-dodecyl biquaternary ammonium salt have synergistic effect, so that the trapping property and the selectivity of the medicament are enhanced, the biotite in the feldspar ore is effectively removed, and the whiteness is further improved.
The above description is intended to describe in detail the preferred embodiments of the present invention, but the embodiments are not intended to limit the scope of the claims of the present invention, and all equivalent changes and modifications made within the technical spirit of the present invention should fall within the scope of the claims of the present invention.
Claims (7)
1. A potash feldspar concentration method comprises the steps of raw ore cleaning, screening, crushing, ore grinding, flotation and dehydration, and is characterized in that the flotation comprises primary flotation and secondary flotation;
the primary flotation comprises the following steps: adding water into fine sand particles which are obtained by grinding and are not less than 200 meshes to adjust the concentration of the fine sand particles to be 25-35%, adjusting the pH value of the ore slurry to be 3-5, adding sesbania extract accounting for 8-11% of the mass of the ore slurry, stirring for 2-4min, then adding coconut extract accounting for 4-9% of the mass of the ore slurry, stirring until the mixture is foamed, scraping foam, washing with clear water, and dehydrating until the water content is not more than 25% to obtain the de-ironed ore sand;
the secondary flotation comprises the following steps: adding water into the de-ironed ore sand to adjust the concentration to 35-45% of ore pulp, adjusting the pH of the ore pulp to 1-2, adding a medicament accounting for 3-5% of the mass of the ore pulp, stirring until the ore pulp foams, scraping foams, and dehydrating until the water content is less than or equal to 15% to obtain the de-ironed ore; the medicament is mainly prepared by mixing 9-16 parts of sophora flower extract, 18-25 parts of eucalyptus leaf extract, 8-15 parts of tea extract and 9-17 parts of N-dodecyl biquaternary ammonium salt according to parts by weight.
2. The potassium feldspar beneficiation method according to claim 1, wherein: the preparation method of the sesbania extract comprises the following steps: soaking sesbania seeds in water for 6-8h, taking out, grinding for 8-10min, adding 30-40 weight times of water, mixing uniformly, centrifuging, taking supernatant, adding 20-30 weight times of ethanol solution with the mass concentration of 60-70% into the supernatant, standing until precipitate is separated out, centrifuging, taking precipitate, and vacuum drying to obtain the product.
3. The potassium feldspar beneficiation method according to claim 1, wherein: the preparation method of the coconut extract comprises the following steps: pulverizing fresh coconut meat, adding 80-90 deg.C water, grinding for 10-20min, cooling to 40-45 deg.C, adding 0.1-0.3 wt% alpha-amylase, treating for 30-50min, adding 0.1-0.3 wt% papain, continuing enzymolysis for 30-40min, filtering with filter cloth, centrifuging filtrate, and collecting supernatant.
4. The potassium feldspar beneficiation method according to claim 1, wherein: the preparation method of the sophora flower extract comprises the following steps: adding fresh sophora flower into 8-10 times of water by weight, decocting for 1-2h, filtering, concentrating the filtrate to 1/2 of the original volume, standing for 10-20h, performing suction filtration, adding the precipitate into 30-40 times of ethanol solution with the mass concentration of 85-95%, performing reflux extraction for 2-3h, and collecting the extract.
5. The potassium feldspar beneficiation method according to claim 1, wherein: the preparation method of the eucalyptus leaf extract comprises the following steps: oven drying fresh folium Eucalypti Globueli at 40-50 deg.C to constant weight, pulverizing, sieving with 20-40 mesh sieve to obtain coarse powder, distilling the coarse powder and water in a distiller for 3-4 hr, collecting oil phase, freezing the collected oil at-20 deg.C to-15 deg.C for 1-2 hr, centrifuging, and heating and melting the solid.
6. The potassium feldspar beneficiation method according to claim 1, wherein: the preparation method of the tea extract comprises the following steps: grinding tea leaves, adding 20-30 times of water by weight, heating to 70-85 ℃, keeping the temperature unchanged, leaching for 2-3h, cooling, performing suction filtration, adding filtrate into 0.1mol/L equivalent aluminum chloride solution, adjusting the pH to 5-6, standing until precipitate is generated, performing suction filtration, dissolving the precipitate in 0.018mol/L hydrochloric acid solution, extracting with ethyl acetate for 10-20min, collecting extract liquor, distilling and recovering ethyl acetate, and collecting residual solids.
7. The potassium feldspar beneficiation method according to claim 1, wherein: the medicament is mainly prepared by mixing 11 parts of sophora flower extract, 20 parts of eucalyptus leaf extract, 10 parts of tea extract and 15 parts of N-dodecyl biquaternary ammonium salt according to parts by weight.
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Denomination of invention: A method for cleaning potassium feldspar Effective date of registration: 20211108 Granted publication date: 20210608 Pledgee: Bank of Guilin Co., Ltd. Hezhou branch Pledgor: Hezhou Junxin mineral products Co., Ltd Registration number: Y2021450000045 |