CN110681372A - Method for preparing decoloring agent by using low-grade attapulgite clay raw ore - Google Patents
Method for preparing decoloring agent by using low-grade attapulgite clay raw ore Download PDFInfo
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Abstract
The invention relates to the technical field of attapulgite clay processing, in particular to a method for preparing a decoloring agent by using low-grade attapulgite clay raw ore, which comprises the following steps: mineral separation, crushing, acid adding and grinding. The method has simple process and low cost, can produce the decolorant meeting the national standard by using the low-grade attapulgite clay raw ore with the attapulgite content of 20-40 percent, and fills the technical blank of producing the decolorant by using the low-grade attapulgite clay raw ore.
Description
Technical Field
The invention relates to the technical field of attapulgite clay processing, in particular to a method for preparing a decoloring agent by using low-grade attapulgite clay raw ore.
Background
The attapulgite clay has good decolorizing capacity when being used for producing the grease decolorizing agent, the activation process is simple, the raw materials are prepared by activation, solidification, modification, crushing and grading production, the impurities are not required to be removed, the tailings are not required to be removed, the rinsing and the deacidification are not required, the environmental pollution is avoided, the continuous production can be realized, and the production cost is low. But has high requirements on the grade of the attapulgite clay used for production, and the content of the attapulgite in the mineral components is at least more than 45 percent, even more than 50 percent.
At present, Xuyi and Liuhe high-quality attapulgite clay is mainly used for producing the grease decoloring agent by using attapulgite clay domestically. The Xuyi (Longwangshan) attapulgite clay comprises 70-80% of attapulgite, 5-10% of quartz, 10-25% of hydromica and montmorillonite and 2% of opal. The attapulgite clay mineral components of the Liuhe (white hills and small-pan mountains) comprise 40-50% of attapulgite, 25-30% of montmorillonite and quartz and dolomite.
The attapulgite clay in Gansu Linze and Huining places has attapulgite content of only 20-30% and low crystallization degree and order degree, and cannot be used for producing oil decolorizer, thus becoming a difficult problem which troubles the development of local attapulgite clay industry. At present, domestic large-scale colleges and universities and enterprises are in research and development, no feasible technical scheme is developed, and the attapulgite clay in Gansu is yet to be developed and utilized in large quantities.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the defects in the background technology, the method for preparing the decoloring agent by using the low-grade attapulgite clay raw ore is provided, the process is simple, the cost is saved, and the prepared decoloring agent meets the national standard.
The scheme for solving the technical problems is as follows: a method for preparing a decoloring agent by using low-grade attapulgite clay raw ore comprises the following steps:
the method comprises the following steps: mineral separation, namely performing mineral separation treatment on low-grade attapulgite clay raw ore with the attapulgite content of 20-40% to remove gypsum and sandstone to form 100 parts of a pre-selected material H;
step two: crushing, namely crushing the pre-selected material H by using a crushing device to form crushed material K;
step three: adding acid, namely adding 20 to 45 parts of attapulgite clay solid acidifying agent into the crushed material K, and uniformly stirring to form a mixture L;
step four: grinding: the mixture L is ground to be 200 meshes in fineness, the passing rate is 80-90%, the water content is less than or equal to 10%, and the acid content is less than or equal to 0.2%, so that a finished product is prepared.
Optimally, when the content of attapulgite in the low-grade attapulgite clay raw ore in the step one is 20%, 45 parts of attapulgite clay solid acidifying agent is added in the step three.
Optimally, when the content of attapulgite in the low-grade attapulgite clay raw ore in the step one is 32%, 32 parts of attapulgite clay solid acidifying agent are added in the step three.
Optimally, when the content of attapulgite in the low-grade attapulgite clay raw ore in the step one is 40%, 20 parts of attapulgite clay solid acidifying agent is added in the step three.
Optimally, kaolinite, muscovite, dolomite, chlorite, illite and the like or montmorillonite are associated in the low-grade attapulgite clay raw ore.
In the method for preparing the decoloring agent by using the low-grade attapulgite clay raw ore, the attapulgite clay solid acidifying agent comprises the following components in percentage by weight: SiO 2258 to 71 percent of Al2O35.0-15% of Fe2O31.5-5%, 0.2-5.5% of MgO, 0.5-4.5% of CaO, 2.5-11% of free acid and the balance of inevitable impurities.
Preferably, the attapulgite clay solid acidifier comprises the following components: SiO 2258% of Al2O3Content 14.75%, Fe2O34.63% of MgO, 3.17% of CaO, 2.5% of free acid and the balance unavoidable impurities.
Preferably, the attapulgite clay solid acidifier comprises the following components: SiO 2265% of Al2O3Content 12.62% Fe2O32.32% of the total content, 0.45% of MgO, 1.24% of CaO, 6.28% of free acid, and the balance unavoidable impurities.
Preferably, the attapulgite clay solid acidifier comprises the following components: SiO 2271% of Al2O36.12% of Fe2O31.52 percent, 0.24 percent of MgO, 2.31 percent of CaO, 11 percent of free acid and the balance of inevitable impurities.
Preferably, the attapulgite clay solid acidifier also comprises sulfur trioxide and loss on ignition.
In the method for preparing the decoloring agent by using the low-grade attapulgite clay raw ore, the preparation method of the attapulgite clay solid acidifying agent comprises the following steps:
the method comprises the following steps: crushing, namely mixing the bentonite ore and the attapulgite clay according to the proportion of 4: 1-2: 1, and crushing to form 30 parts of crushed material A;
step two: wet purification, namely putting the crushed material A into 100 parts of water, and adding 0.5-1 part of dispersant for wet purification to form a mixture B;
step three: adding acid, and putting 3-7.5 parts of sulfuric acid with the concentration of 98% into the mixture B to be uniformly stirred to form a mixture C;
step four: heating and acidifying, namely introducing steam to heat and acidify the mixture C, wherein the reaction temperature is 120-130 ℃, the reaction pressure is 0.2-0.3 MPa, and the reaction time is 2 hours to form a mixture D;
step five: washing with acid, filter-pressing, adding water to dilute the mixture D until the content of free acid is 2.5% -11%, and then filter-pressing and dehydrating to form a mixture E;
step six: cooling and drying, namely cooling the mixture E to room temperature, and then drying or sun-drying to form a mixture F, wherein the water content of the mixture F is less than or equal to 10%;
step seven: and grinding, namely grinding the mixture E to obtain a mixture with the fineness of 200 meshes and the passing rate of more than or equal to 90 percent to form a final finished product.
Optimally, the bentonite ore in the first step is calcium bentonite, magnesium bentonite or a mixture of the calcium bentonite and the magnesium bentonite.
Preferably, the dispersant in the second step is sodium pyrophosphate, sodium hexametaphosphate or sodium silicate.
Optimally, 0.8 part of dispersing agent is added in the second step, and the dispersing agent is beneficial to improving the efficiency of wet purification.
Optimally, acid water formed after filter pressing and dehydration of the mixture D in the fifth step can be conveyed to the second step for wet purification, and the acid water can be recycled.
The invention has the beneficial effects that: 1. fills the technical blank of producing the decoloring agent from the low-grade attapulgite clay raw ore. The method can process the low-grade attapulgite clay raw ore with the attapulgite content of 20-40 percent, produce the decolorant meeting the national standard, break through the technical limitation that the decolorant can be produced only by using the high-grade attapulgite clay raw ore in the traditional process, fill the technical blank of producing the decolorant by using the low-grade attapulgite clay raw ore, provide a technical scheme for the large-scale high-valued development and utilization of the low-grade attapulgite clay raw ore, particularly attapulgite clay in Gansu areas, greatly improve the high-value utilization rate of the low-grade attapulgite clay raw ore and save mineral resources.
2. The process is simple and the cost is saved. According to the preparation method of the attapulgite clay solid acidifying agent, the production acid consumption is less, acid water formed in the acid washing and pressure filtering process can be recycled, the acid water treatment and discharge load is lower, and the enterprise pollution discharge and water and electricity utilization cost is lower. When the decoloring agent is prepared, the attapulgite clay solid acidifying agent is directly used for acidification, acid and water washing are not needed, the production process is simple, the production cost is low, and the production safety is high. Therefore, the whole process flow for producing the decolorizing agent is simple in process, high in production safety, small in acid consumption for production, low in acid water treatment and discharge load of enterprises, and good in economic and environmental benefits.
3. The product meets the national standard, and the decolorizer decolorization rate is improved. According to the attapulgite clay solid acidifier, the original special pore structure and interface properties in attapulgite clay are not damaged, acid radical ions are converted with metal ions in materials, the number of adsorbed cations is increased, the void ratio and specific surface area of the materials are improved, and the decolorization rate of the attapulgite clay decolorizer is improved. Through continuous experiments and detection, the quality indexes of the decolorant product produced by the invention are as follows: decolouring rate is greater than or equal to 70%, water content is less than or equal to 10%, free acid (by H)2SO4Calculated by the weight percentage of less than or equal to 0.2 percent, the fineness (passing through a 75 mu m screen) of more than or equal to 85 percent, and the bulk density of 0.5 to 1.0g/cm3Heavy metal (calculated by pb) is less than or equal to 40mg/kg, total arsenic (calculated by As) is less than or equal to 3mg/kg, and the standard of GB29225-2012 is met.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described below with reference to the following examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The following three low-grade attapulgite clay raw ores are used in the following examples of the invention:
the first low-grade attapulgite clay raw ore: the main component is SiO247.9% of Al2O3Content 10.63% Fe2O34.04% of MgO, 7.96% of MgO, 8.91% of CaO, SO3The content is 2.38 percent, other impurities are 3.07 percent, and the loss on ignition is 15.11 percent. Wherein, the content of attapulgite is 20 percent, and the decolorization rate is 5.6 percent.
The second low-grade attapulgite clay raw ore: the main component is SiO250.4% of Al2O316.55% of Fe2O37.45% of MgO, 5.27% of CaO, 3.35% of SO3The content is 2.06 percent, other impurities are 2.11 percent, and the loss on ignition is 12.81 percent. Wherein, the content of attapulgite is 32.8 percent, and the decolorization rate is 6.3 percent.
The third low-grade attapulgite clay raw ore: the main component is SiO257.76% Al2O3Content 7.46%, Fe2O34.48% of MgO, 2.59% of CaO, 10.23% of SO2The content is 1.25 percent, other impurities are 2.67 percent, and the loss on ignition is 13.56 percent. Wherein, the content of attapulgite is 40 percent, and the decolorization rate is 7.2 percent.
Example 1
The first attapulgite clay solid acidifying agent comprises the following components in percentage by weight: SiO 2258% of Al2O3Content 14.75%, Fe2O34.63% of MgO, 3.17% of MgO, 0.78% of CaO, SO32.63 percent of the total weight, 13.24 percent of loss on ignition, 2.5 percent of free acid and the balance of inevitable impurities.
The first preparation method of the attapulgite clay solid acidifying agent comprises the following steps:
the method comprises the following steps: crushing, namely mixing bentonite ore and attapulgite clay according to the proportion of 2:1, and crushing by using a jaw crusher to form 300 kg of crushed material A;
step two: wet purification, namely putting the crushed material A into 1000 kg of water, and adding 8 kg of dispersant for wet purification to form a mixture B;
step three: adding acid, and putting 75 kg of 98% sulfuric acid into the mixture B to be uniformly stirred to form a mixture C;
step four: heating and acidifying, namely introducing steam to heat and acidify the mixture C, wherein the reaction temperature is 120-130 ℃, the reaction pressure is 0.2-0.3 MPa, and the reaction time is 2 hours to form a mixture D;
step five: washing with acid, filter-pressing, adding water to dilute the mixture D until the content of free acid is detected to be 2.5% -11%, and then filter-pressing and dehydrating to form a mixture E;
step six: cooling and drying, namely cooling the mixture E to room temperature, and then drying or sun-drying to form a mixture F, wherein the water content of the mixture F is less than or equal to 10%;
step seven: grinding: and grinding the mixture F to obtain a mixture with the fineness of 200 meshes and the passing rate of more than or equal to 90 percent, thus forming a final finished product.
The decolorizing agent is prepared from a first low-grade attapulgite clay raw ore (with the attapulgite content of 20%) and a first attapulgite clay solid acidifying agent, and through detection, the content of free acid in a finished product of the decolorizing agent is 0.10%, and the decolorizing rate reaches 75%. The preparation method comprises the following steps:
the method comprises the following steps: mineral separation, namely performing mineral separation treatment on the first low-grade attapulgite clay raw ore to remove gypsum and sandstone to form 1000 kg of pre-selected material H;
step two: crushing, namely crushing the pre-selected material H by using a crushing device to form crushed material K;
step three: adding acid, namely adding 450 kg of first attapulgite clay solid acidifying agent into the crushed material K, and uniformly stirring to form a mixture L;
step four: grinding: the mixture L is ground to be 200 meshes in fineness, the passing rate is 80-90%, the water content is less than or equal to 10%, and the acid content is less than or equal to 0.2%, so that a finished product is prepared.
The second low-grade attapulgite clay raw ore (the content of attapulgite is 32.8%) and the first attapulgite clay solid acidifying agent are used for preparing the decolorizing agent, and detection shows that the content of free acid in a finished product of the decolorizing agent is 0.07%, and the decolorizing rate reaches 76.2%. The preparation method comprises the following steps:
the method comprises the following steps: mineral separation, namely performing mineral separation treatment on a second low-grade attapulgite clay raw ore to remove gypsum and sandstone to form 1000 kg of pre-selected material H;
step two: crushing, namely crushing the pre-selected material H by using a crushing device to form crushed material K;
step three: adding acid, namely adding 320 kg of first attapulgite clay solid acidifying agent into the crushed material K, and uniformly stirring to form a mixture L;
step four: grinding: the mixture L is ground to be 200 meshes in fineness, the passing rate is 80-90%, the water content is less than or equal to 10%, and the acid content is less than or equal to 0.2%, so that a finished product is prepared.
The decoloring agent is prepared by using a third low-grade attapulgite clay raw ore (the content of attapulgite is 40%) and a first attapulgite clay solid acidifying agent, and through detection, the content of free acid in a finished decoloring agent product is 0.05%, and the decoloring rate reaches 78%. The preparation method comprises the following steps:
the method comprises the following steps: mineral separation, namely carrying out mineral separation treatment on the third low-grade attapulgite clay raw ore to remove gypsum and sandstone, and forming 1000 kg of pre-selected material H;
step two: crushing, namely crushing the pre-selected material H by using a crushing device to form crushed material K;
step three: adding acid, namely adding 200 kg of a first attapulgite clay solid acidifying agent into the crushed material K, and uniformly stirring to form a mixture L;
step four: grinding: the mixture L is ground to be 200 meshes in fineness, the passing rate is 80-90%, the water content is less than or equal to 10%, and the acid content is less than or equal to 0.2%, so that a finished product is prepared.
Example 2
The second attapulgite clay solid acidifying agent comprises the following components in percentage by weight: SiO 2265% of Al2O3Content 12.62% Fe2O32.32% of MgO, 1.24% of CaO, SO32.63 percent of the total weight, 9.24 percent of the loss on ignition, 6.28 percent of the free acid and the balance of inevitable impurities.
The second preparation method of the attapulgite clay solid acidifying agent comprises the following steps:
the method comprises the following steps: crushing, namely mixing bentonite ore and attapulgite clay according to the proportion of 3:1, and crushing by using a jaw crusher to form 300 kg of crushed material A;
step two: wet purification, namely putting the crushed material A into 1000 kg of water, and adding 5 kg of dispersant for wet purification to form a mixture B;
step three: adding acid, and putting 112.5 kilograms of 98 percent sulfuric acid into the mixture B to be uniformly stirred to form a mixture C;
step four: heating and acidifying, namely introducing steam to heat and acidify the mixture C, wherein the reaction temperature is 120-130 ℃, the reaction pressure is 0.2-0.3 MPa, and the reaction time is 2 hours to form a mixture D;
step five: washing with acid, filter-pressing, adding water to dilute the mixture D until the content of free acid is detected to be 2.5% -11%, and then filter-pressing and dehydrating to form a mixture E;
step six: cooling and drying, namely cooling the mixture E to room temperature, and then drying or sun-drying to form a mixture F, wherein the water content of the mixture F is less than or equal to 10%;
step seven: grinding: and grinding the mixture F to obtain a mixture with the fineness of 200 meshes and the passing rate of more than or equal to 90 percent, thus forming a final finished product.
The decolorizing agent is prepared from a first low-grade attapulgite clay raw ore (with the attapulgite content of 20%) and a second attapulgite clay solid acidifying agent, and through detection, the content of free acid in a finished product of the decolorizing agent is 0.15%, and the decolorizing rate reaches 78.4%. The preparation method comprises the following steps:
the method comprises the following steps: mineral separation, namely performing mineral separation treatment on the first low-grade attapulgite clay raw ore to remove gypsum and sandstone to form 1000 kg of pre-selected material H;
step two: crushing, namely crushing the pre-selected material H by using a crushing device to form crushed material K;
step three: adding acid, namely adding 450 kg of a second attapulgite clay solid acidifying agent into the crushed material K, and uniformly stirring to form a mixture L;
step four: grinding: the mixture L is ground to be 200 meshes in fineness, the passing rate is 80-90%, the water content is less than or equal to 10%, and the acid content is less than or equal to 0.2%, so that a finished product is prepared.
The second low-grade attapulgite clay raw ore (the content of attapulgite is 32.8%) and the second attapulgite clay solid acidifying agent are used for preparing the decolorizing agent, and the detection shows that the content of free acid in a finished product of the decolorizing agent is 0.11%, and the decolorizing rate reaches 79.2%. The preparation method comprises the following steps:
the method comprises the following steps: mineral separation, namely performing mineral separation treatment on a second low-grade attapulgite clay raw ore to remove gypsum and sandstone to form 1000 kg of pre-selected material H;
step two: crushing, namely crushing the pre-selected material H by using a crushing device to form crushed material K;
step three: adding acid, namely adding 320 kg of a second attapulgite clay solid acidifying agent into the crushed material K, and uniformly stirring to form a mixture L;
step four: grinding: the mixture L is ground to be 200 meshes in fineness, the passing rate is 80-90%, the water content is less than or equal to 10%, and the acid content is less than or equal to 0.2%, so that a finished product is prepared.
The decolorant is prepared by using a third low-grade attapulgite clay raw ore (the content of attapulgite is 40%) and a second attapulgite clay solid acidifying agent, and through detection, the content of free acid in a finished decolorant product is 0.07%, and the decolorant rate reaches 82.1%. The preparation method comprises the following steps:
the method comprises the following steps: mineral separation, namely carrying out mineral separation treatment on the third low-grade attapulgite clay raw ore to remove gypsum and sandstone, and forming 1000 kg of pre-selected material H;
step two: crushing, namely crushing the pre-selected material H by using a crushing device to form crushed material K;
step three: adding acid, namely adding 200 kg of a second attapulgite clay solid acidifying agent into the crushed material K, and uniformly stirring to form a mixture L;
step four: grinding: the mixture L is ground to be 200 meshes in fineness, the passing rate is 80-90%, the water content is less than or equal to 10%, and the acid content is less than or equal to 0.2%, so that a finished product is prepared.
Example 3
The third attapulgite clay solid acidifying agent comprises the following components in percentage by weightComprises the following components: SiO 2271% of Al2O36.12% of Fe2O31.52% of MgO, 0.24% of CaO, 2.31% of SO30.65 percent of the total content, 7.11 percent of loss on ignition, 11 percent of product free acid and the balance of inevitable impurities.
The preparation method of the third attapulgite clay solid acidifying agent comprises the following steps:
the method comprises the following steps: crushing, namely mixing bentonite ore and attapulgite clay according to the proportion of 4:1, and crushing by using a jaw crusher to form 300 kg of crushed material A;
step two: wet purification, namely putting the crushed material A into 1000 kg of water, and adding 10 kg of dispersant for wet purification to form a mixture B;
step three: adding acid, and putting 150 kg of 98% sulfuric acid into the mixture B to be uniformly stirred to form a mixture C;
step four: heating and acidifying, namely introducing steam to heat and acidify the mixture C, wherein the reaction temperature is 120-130 ℃, the reaction pressure is 0.2-0.3 MPa, and the reaction time is 2 hours to form a mixture D;
step five: washing with acid, filter-pressing, adding water to dilute the mixture D until the content of free acid is detected to be 2.5% -11%, and then filter-pressing and dehydrating to form a mixture E;
step six: cooling and drying, namely cooling the mixture E to room temperature, and then drying or sun-drying to form a mixture F, wherein the water content of the mixture F is less than or equal to 10%;
step seven: grinding: and grinding the mixture F to obtain a mixture with the fineness of 200 meshes and the passing rate of more than or equal to 90 percent, thus forming a final finished product.
The first low-grade attapulgite clay raw ore (with the attapulgite content of 20%) and the third attapulgite clay solid acidifying agent are used for preparing the decoloring agent, and through detection, the content of free acid in a finished decoloring agent product is 0.19%, and the decoloring rate reaches 79.8%. The preparation method comprises the following steps:
the method comprises the following steps: mineral separation, namely performing mineral separation treatment on the first low-grade attapulgite clay raw ore to remove gypsum and sandstone to form 1000 kg of pre-selected material H;
step two: crushing, namely crushing the pre-selected material H by using a crushing device to form crushed material K;
step three: adding acid, namely adding 450 kg of a third attapulgite clay solid acidifying agent into the crushed material K, and uniformly stirring to form a mixture L;
step four: grinding: the mixture L is ground to be 200 meshes in fineness, the passing rate is 80-90%, the water content is less than or equal to 10%, and the acid content is less than or equal to 0.2%, so that a finished product is prepared.
The second low-grade attapulgite clay raw ore (the content of attapulgite is 32.8%) and the third attapulgite clay solid acidifying agent are used for preparing the decolorizing agent, and the detection shows that the content of free acid in a finished product of the decolorizing agent is 0.16%, and the decolorizing rate reaches 81.14%. The preparation method comprises the following steps:
the method comprises the following steps: mineral separation, namely performing mineral separation treatment on a second low-grade attapulgite clay raw ore to remove gypsum and sandstone to form 1000 kg of pre-selected material H;
step two: crushing, namely crushing the pre-selected material H by using a crushing device to form crushed material K;
step three: adding acid, namely adding 320 kg of a third attapulgite clay solid acidifying agent into the crushed material K, and uniformly stirring to form a mixture L;
step four: grinding: the mixture L is ground to be 200 meshes in fineness, the passing rate is 80-90%, the water content is less than or equal to 10%, and the acid content is less than or equal to 0.2%, so that a finished product is prepared.
The decolorant is prepared from a third low-grade attapulgite clay raw ore (the content of attapulgite is 40%) and a third attapulgite clay solid acidifying agent, and through detection, the content of free acid in a finished decolorant product is 0.11%, and the decolorant rate reaches 85.2%. The preparation method comprises the following steps:
the method comprises the following steps: mineral separation, namely carrying out mineral separation treatment on the third low-grade attapulgite clay raw ore to remove gypsum and sandstone, and forming 1000 kg of pre-selected material H;
step two: crushing, namely crushing the pre-selected material H by using a crushing device to form crushed material K;
step three: adding acid, namely adding 200 kg of a third attapulgite clay solid acidifying agent into the crushed material K, and uniformly stirring to form a mixture L;
step four: grinding: the mixture L is ground to be 200 meshes in fineness, the passing rate is 80-90%, the water content is less than or equal to 10%, and the acid content is less than or equal to 0.2%, so that a finished product is prepared.
In the above embodiment, the dispersant is sodium pyrophosphate, but sodium hexametaphosphate or sodium silicate may be used, and the dispersant is added only to accelerate the efficiency of wet purification, and has no influence on the components of attapulgite clay.
The above description is only exemplary of the present invention and should not be taken as limiting the invention, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method for preparing a decoloring agent by using low-grade attapulgite clay raw ore comprises the following steps:
the method comprises the following steps: mineral separation, namely performing mineral separation treatment on low-grade attapulgite clay raw ore with the attapulgite content of 20-40% to remove gypsum and sandstone to form 100 parts of a pre-selected material H;
step two: crushing, namely crushing the pre-selected material H by using a crushing device to form crushed material K;
step three: adding acid, namely adding 20 to 45 parts of attapulgite clay solid acidifying agent into the crushed material K, and uniformly stirring to form a mixture L;
step four: grinding: the mixture L is ground to be 200 meshes in fineness, the passing rate is 80-90%, the water content is less than or equal to 10%, and the acid content is less than or equal to 0.2%, so that a finished product is prepared.
2. The method for preparing the decoloring agent by using the low-grade attapulgite clay raw ore according to claim 1, wherein the attapulgite clay solid acidifying agent in the third step consists of the following components in percentage by weight: SiO 2258 to 71 percent of Al2O35.0-15% of Fe2O31.5-5%, 0.2-5.5% of MgO, 0.5-4.5% of CaO, 2.5-11% of free acid and the balance of inevitable impurities.
3. The method for preparing a decoloring agent by using low-grade attapulgite clay raw ore according to claim 1 or 2, wherein 45 parts of attapulgite clay solid acidifying agent is added in the third step when the content of attapulgite in the low-grade attapulgite clay raw ore in the first step is 20%.
4. The method for preparing a decoloring agent by using low-grade attapulgite clay raw ore according to claim 1 or 2, wherein 32 parts of attapulgite clay solid acidifying agent is added in the third step when the content of attapulgite in the low-grade attapulgite clay raw ore in the first step is 32%.
5. The method for preparing a decoloring agent by using low-grade attapulgite clay raw ore according to claim 1 or 2, wherein 20 parts of attapulgite clay solid acidifying agent is added in the third step when the content of attapulgite in the low-grade attapulgite clay raw ore in the first step is 40%.
6. The method for preparing a decoloring agent by using low-grade attapulgite clay raw ore according to claim 1 or 2, wherein kaolinite, muscovite, dolomite, chlorite, illite and the like or montmorillonite are associated with the low-grade attapulgite clay raw ore.
7. The method for preparing the decoloring agent by using the low-grade attapulgite clay raw ore according to claim 2, wherein the attapulgite clay solid acidifying agent further comprises sulfur trioxide and loss on ignition in the composition.
8. The method for preparing the decoloring agent by using the low-grade attapulgite clay raw ore according to claim 2, wherein the method for preparing the attapulgite clay solid acidifying agent comprises the following steps:
the method comprises the following steps: crushing, namely mixing the bentonite ore and the attapulgite clay according to the proportion of 4: 1-2: 1, and crushing to form 30 parts of crushed material A;
step two: wet purification, namely putting the crushed material A into 100 parts of water, and adding 0.5-1 part of dispersant for wet purification to form a mixture B;
step three: adding acid, and putting 3-7.5 parts of sulfuric acid with the concentration of 98% into the mixture B to be uniformly stirred to form a mixture C;
step four: heating and acidifying, namely introducing steam to heat and acidify the mixture C, wherein the reaction temperature is 120-130 ℃, the reaction pressure is 0.2-0.3 MPa, and the reaction time is 2 hours to form a mixture D;
step five: washing with acid, filter-pressing, adding water to dilute the mixture D until the content of free acid is 2.5% -11%, and then filter-pressing and dehydrating to form a mixture E;
step six: cooling and drying, namely cooling the mixture E to room temperature, and then drying or sun-drying to form a mixture F, wherein the water content of the mixture F is less than or equal to 10%;
step seven: and grinding, namely grinding the mixture E to obtain a mixture with the fineness of 200 meshes and the passing rate of more than or equal to 90 percent to form a final finished product.
9. The method for preparing a decoloring agent by using low-grade attapulgite clay raw ore according to claim 8, wherein the dispersant in the second step of the preparation method of the attapulgite clay solid acidifying agent is sodium pyrophosphate, sodium hexametaphosphate or sodium silicate.
10. The method for preparing the decoloring agent by using the low-grade attapulgite clay raw ore according to claim 8, wherein in the step five of the preparation method of the attapulgite clay solid acidifying agent, acid water formed by filter pressing and dehydration of the mixture D can be conveyed to the step two for recycling.
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| CN115215350A (en) * | 2022-08-05 | 2022-10-21 | 西北师范大学 | Purification method of attapulgite clay and attapulgite-based mineralized water agent |
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