CN112978746B - Clay type ultra-low grade diatomite purification method - Google Patents
Clay type ultra-low grade diatomite purification method Download PDFInfo
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title claims abstract description 91
- 238000000034 method Methods 0.000 title claims abstract description 31
- 239000004927 clay Substances 0.000 title claims abstract description 15
- 238000000746 purification Methods 0.000 title claims description 11
- 238000005201 scrubbing Methods 0.000 claims abstract description 124
- 238000002386 leaching Methods 0.000 claims abstract description 27
- 239000012141 concentrate Substances 0.000 claims abstract description 16
- 239000007788 liquid Substances 0.000 claims abstract description 13
- 238000001035 drying Methods 0.000 claims abstract description 9
- 238000000926 separation method Methods 0.000 claims abstract description 6
- 238000005406 washing Methods 0.000 claims abstract description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 33
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 24
- 239000000725 suspension Substances 0.000 claims description 23
- 239000002893 slag Substances 0.000 claims description 21
- 238000000227 grinding Methods 0.000 claims description 20
- 238000004062 sedimentation Methods 0.000 claims description 18
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 claims description 15
- 235000019982 sodium hexametaphosphate Nutrition 0.000 claims description 15
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 claims description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 14
- 238000003756 stirring Methods 0.000 claims description 14
- 239000002270 dispersing agent Substances 0.000 claims description 11
- 230000005389 magnetism Effects 0.000 claims description 11
- 238000001914 filtration Methods 0.000 claims description 10
- 239000000696 magnetic material Substances 0.000 claims description 10
- 229910052742 iron Inorganic materials 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 5
- 238000005728 strengthening Methods 0.000 claims description 5
- 230000003313 weakening effect Effects 0.000 claims description 5
- 238000007885 magnetic separation Methods 0.000 abstract description 6
- 238000003723 Smelting Methods 0.000 abstract description 2
- 239000005909 Kieselgur Substances 0.000 description 6
- 239000002245 particle Substances 0.000 description 5
- 238000011084 recovery Methods 0.000 description 5
- -1 agriculture Substances 0.000 description 3
- 239000003153 chemical reaction reagent Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 229910010293 ceramic material Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002572 peristaltic effect Effects 0.000 description 2
- 241000195493 Cryptophyta Species 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 229910021486 amorphous silicon dioxide Inorganic materials 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033558 biomineral tissue development Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000004587 chromatography analysis Methods 0.000 description 1
- 239000002734 clay mineral Substances 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000010433 feldspar Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000012767 functional filler Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000008204 material by function Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/20—Silicates
- C01B33/36—Silicates having base-exchange properties but not having molecular sieve properties
- C01B33/38—Layered base-exchange silicates, e.g. clays, micas or alkali metal silicates of kenyaite or magadiite type
- C01B33/40—Clays
- C01B33/405—Clays not containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Dispersion Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a method for purifying clay-type ultralow-grade diatomite, which is characterized in that clay-type ultralow-grade diatomite is crushed and ground by a dressing and smelting combined method, granularity is strictly controlled, ground ore products are subjected to four-section scrubbing to obtain coarse and fine clay, the coarse and fine clay is subjected to magnetic separation, roasting, leaching, washing, solid-liquid separation and drying to finally obtain diatomite concentrate.
Description
Technical Field
The invention relates to a method for purifying clay-type ultralow-grade diatomite, and belongs to the technical field of diatomite extraction.
Background
Diatomaceous earth is siliceous sedimentary rock formed by sediment mineralization of single-cell algae remains for millions of years or more, and the chemical components are mainly amorphous silicon dioxide. The porous ceramic material has a microporous structure, and the unique structure endows the porous ceramic material with the characteristics of high porosity, small bulk density, large specific surface area, low heat conductivity coefficient, strong adsorptivity, good activity and the like, is a functional filler widely applied in various industrial fields, and is widely applied to the fields of food, pharmaceutical industry, sewage treatment, road asphalt, building materials, agriculture, filler coating, functional materials and the like.
Diatomaceous earth is generally classified into primary earth, secondary earth and tertiary earth according to the content of silica. Although the diatomite reserves in China are rich, the diatomite deposits with good quality are less, most of the diatomite deposits are secondary and tertiary diatomite and SiO except for the diatomite deposits with Jilin length Bai Linjiang 2 The content is low, and the purification is a precondition of the deep processing of the diatomite with high added value. Naturally occurring diatomaceous earth ore is usually an aggregate of various nonmetallic minerals, and contains clay minerals, quartz, feldspar, organic matters, and other components in addition to the diatomaceous earth shell. These components are intercalated and wrapped with the diatom shell, so that the purification difficulty of the diatomite is increased. Because of this, improvement of the purification technology level is particularly important for application of diatomite in the field of high added value. The purification treatment method of the diatomite mainly comprises scrubbing, acid leaching, roasting, selective turbulent coagulation, dry gravity chromatography separation and the like. At present, no systematic purification process for the ultra-low grade diatomite exists, so that the comprehensive utilization rate of the ultra-low grade diatomite resources is low.
Disclosure of Invention
The invention aims to provide a method for purifying clay-type ultralow-grade diatomite, which is characterized in that clay-type ultralow-grade diatomite is purified by a dressing and smelting combined method, the clay-type ultralow-grade diatomite is crushed, ground, the granularity is strictly controlled, a ground product is scrubbed by four sections to obtain coarse and fine clay, the coarse and fine clay is subjected to magnetic separation, roasting, leaching, washing, solid-liquid separation and drying, and finally diatomite concentrate is obtained, so that the diatomite product with the first-grade standard is obtained, and the comprehensive utilization rate of ultralow-grade diatomite resources is greatly improved.
The technical scheme of the invention is as follows: a method for purifying clay-type ultralow-grade diatomite comprises the following specific steps:
(1) Crushing and grinding the ultralow-grade diatomite, wherein the grinding concentration is 40-50%, grinding the diatomite to the granularity of-0.1 mm, and filtering the ore pulp after grinding to obtain filter residues;
(2) Mixing the filter residues in the step (1), performing ultrasonic scrubbing, taking the settled bottom residues after ultrasonic scrubbing as tailings, and performing ultrasonic scrubbing-free suspension liquid, wherein the bottom residues after ultrasonic scrubbing are coarse concentrates of diatomite;
(3) Carrying out iron removal on the rough concentrate of the diatomite in the step (2) by a method of firstly weakening magnetism and then strengthening magnetism to obtain a non-magnetic material, and then filtering and drying the non-magnetic material, wherein the magnetic field strength and the iron removal process are adjusted according to the property of iron in the rough and refined soil;
(4) Roasting the nonmagnetic material in the step (3) to obtain a roasting product;
(5) And (3) carrying out sulfuric acid leaching on the roasting product in the step (4), and washing, solid-liquid separation and drying the obtained leaching slag to obtain diatomite concentrate.
The ultrasonic scrubbing in the step (2) is carried out in a diatomite ultrasonic scrubbing machine, the diatomite ultrasonic scrubbing machine is a patent of the prior application, the patent application number is 201922134448.3, and the diatomite ultrasonic scrubbing machine comprises a cylinder, a bracket, a motor, a belt pulley I, a belt pulley II, a stirring shaft, a mineral feeding port, a discharge pipe, a fixed seat, an ultrasonic transducer, an ultrasonic controller, a peristaltic pump, a lifting pipe fixing frame and a rubber pipe; the cylinder body is arranged on the fixed seat, the bracket is arranged at the top of the cylinder body, the motor is fixed on the bracket, the output shaft of the motor penetrates through the bracket and is provided with the belt pulley I, the belt pulley I is connected with the belt pulley II through a belt, the belt pulley II is fixedly connected with the top of the stirring shaft, the bottom of the stirring shaft penetrates through the top of the cylinder body and stretches into the cylinder body, the top of the cylinder body is provided with a mineral feeding port, the bottom of the cylinder body is provided with a discharge pipe, more than one ultrasonic transducer is arranged on the outer surface of the bottom of the cylinder body, a protective shell is arranged outside the more than one ultrasonic transducer, the more than one ultrasonic transducer is electrically connected with an ultrasonic controller, a lifting tube fixing frame is arranged at the top of the cylinder body, the lifting tube penetrates through the lifting tube fixing frame to extend into the cylinder body, the lifting tube is fixed through the lifting tube fixing frame, and the top end of the lifting tube is communicated with the peristaltic pump through a rubber tube.
The ultrasonic scrubbing in the step (2) comprises a section I ultrasonic scrubbing process, and the non-ultrasonic scrubbing comprises a section II, a section III and a section IV non-ultrasonic scrubbing process.
The scrubbing concentration of the ultrasonic scrubbing process of the section I is 25-35%, the dispersant sodium hexametaphosphate is added, the concentration of the sodium hexametaphosphate is 0.3-0.5%, the stirring intensity is 700-1000 r/min, the scrubbing time is 5-8 min, the sedimentation time is 25-35 min, the obtained suspension is subjected to ultrasonic scrubbing of the section III, the bottom slag is subjected to ultrasonic scrubbing of the section II, the scrubbing concentration of the ultrasonic scrubbing of the section II is 25-30%, the dispersant sodium hexametaphosphate is added, the concentration of the sodium hexametaphosphate is 0.3-0.5%, the stirring intensity is 700-1000 r/min, the scrubbing time is 50-60 min, the sedimentation time is 20-30 min, the suspension obtained by ultrasonic scrubbing of the section II is subjected to ultrasonic scrubbing of the section III, the bottom slag obtained by ultrasonic scrubbing of the section II is tailing I, the scrubbing concentration of the section III without ultrasonic scrubbing is 25% -30%, pH regulator sodium hydroxide is added, the pH value is adjusted to 9-10, the scrubbing time is 40-50 min, the sedimentation time is 8-12 h, the section III without ultrasonic scrubbing bottom slag is subjected to the section IV without ultrasonic scrubbing process, the suspension liquid of the section III without ultrasonic scrubbing is tailings II, the scrubbing concentration of the section IV without ultrasonic scrubbing process is 25% -30%, pH regulator sodium hydroxide is added, the pH value is adjusted to 9-10, the scrubbing time is 40-50 min, the sedimentation time is 12-16 h, the section IV without ultrasonic scrubbing bottom slag is the rough concentrate of diatomite, and the suspension liquid of the section IV without ultrasonic scrubbing returns to the section III without ultrasonic scrubbing to form closed cycle.
And (4) roasting by using a muffle furnace, wherein the roasting temperature is 500-800 ℃ and the roasting time is 1.5-2 hours.
In the step (5), the concentration of sulfuric acid is 20-30%, the leaching temperature is 90-100 ℃, the liquid-solid ratio of sulfuric acid to a roasting product is 4-6:1, and the leaching time is 1.5-2 h.
The beneficial effects of the invention are as follows:
(1) According to the invention, the diatomite is scrubbed by using the diatomite ultrasonic scrubbing machine, and the diatomite is vibrated in the cylinder by utilizing the cavitation effect of ultrasonic waves, so that the diatomite in the cylinder is sufficiently vibrated, impurities wrapped on the outer wall of the diatomite shell and impurities such as clay mixed in the pores of the diatomite shell can be efficiently removed, and the operation is convenient.
(2) According to the invention, four sections of scrubbing are adopted, so that the recovery rate of diatomite can be greatly improved, and the dispersing agent sodium hexametaphosphate is added in the I section ultrasonic scrubbing and the II section scrubbing processes, so that impurities such as clay and the like are fully dispersed, and the diatomite is scrubbed more cleanly.
(3) According to the invention, sodium hydroxide is added in the scrubbing process of the III section and the IV section to adjust the pH value of ore pulp, adjust the potential, so that clay particles have the same negative charge and are repulsed with each other, and the clay particles are dispersed into fine particles after stirring, so that the suspension property and the dispersibility of the clay particles are improved, the clay particles are difficult to precipitate, and the surface of diatomite does not have the same electric charge, so that the sedimentation speed is far higher than that of the clay particles, and the separation of clay and diatomite is realized.
(4) The invention can reduce the acid consumption of subsequent leaching and reduce the cost by magnetic separation before leaching.
(5) The invention is baked before leaching, which not only can remove organic matters in diatomite and improve the grade, but also can enlarge the aperture of diatomite, so that the structure is stable and the subsequent leaching is facilitated.
The purification method for treating the clay-type ultralow-grade diatomite has simple process, can purify the clay-type ultralow-grade diatomite to the first-grade diatomite standard, can ensure the recovery rate, avoid resource waste and greatly improve the comprehensive utilization rate of the ultralow-grade diatomite resources.
Drawings
FIG. 1 is a flow chart of a scrubbing process of the present invention;
fig. 2 is a process flow diagram of the present invention.
Detailed Description
The invention is further described below with reference to the drawings and examples.
Example 1: as shown in fig. 1-2, the clay-type ultra-low grade diatomaceous earth (SiO) is treated by the present method for purifying clay-type ultra-low grade diatomaceous earth 2 45% of content), and the specific steps are as follows:
(1) Crushing and grinding the ultralow-grade diatomite, wherein the grinding concentration is 50%, grinding the diatomite to the granularity of-0.1 mm, and filtering ore pulp after grinding to obtain filter residues;
(2) Mixing the filter residues in the step (1) and then performing four-section scrubbing, wherein the section I adopts ultrasonic scrubbing, the scrubbing concentration is 32%, the dispersant sodium hexametaphosphate is added, the reagent concentration is 0.5%, the stirring intensity is 700r/min, the scrubbing time is 6min, the sedimentation time is 30min, the obtained suspension is subjected to section III non-ultrasonic scrubbing, and the bottom residues are subjected to section II non-ultrasonic scrubbing; the scrubbing concentration of the II section without ultrasonic scrubbing is 30%, the dispersant sodium hexametaphosphate is added, the agent concentration is 0.3%, the stirring intensity is 700r/min, the scrubbing time is 50min, the sedimentation time is 25min, the obtained suspension liquid is subjected to III section scrubbing, and the bottom slag becomes tailing I; the scrubbing concentration of the section III without ultrasonic scrubbing is 28%, a pH regulator sodium hydroxide is added, the pH is adjusted to 9.5, the scrubbing time is 50min, the sedimentation time is 12h, the obtained bottom slag is subjected to section IV without ultrasonic scrubbing, and the suspension is tailings II; the scrubbing concentration of the section IV without ultrasonic scrubbing is 25%, a pH regulator sodium hydroxide is added, the pH is adjusted to 9.5, the scrubbing time is 40min, the sedimentation time is 12h, the obtained bottom slag is coarse and fine diatomite, and the suspension returns to the section III without ultrasonic scrubbing to form closed cycle;
(3) Removing iron from the coarse and refined diatomite obtained in the step (2) by adopting a method of firstly weakening magnetism and then strengthening magnetism, wherein the magnetic field strength of the weak magnetism is 2500GS, so as to obtain a non-magnetic material, and then filtering and drying the non-magnetic material;
(4) Roasting the nonmagnetic material in the step (3) by using a muffle furnace at the roasting temperature of 600 ℃ for 1.5 hours to obtain a roasting product;
(5) And (3) carrying out sulfuric acid leaching on the roasting product obtained in the step (4), wherein the concentration of sulfuric acid is 20%, the leaching temperature is 100 ℃, the liquid-solid ratio is 4:1, the leaching time is 2 hours, and the obtained leaching slag is sequentially washed, solid-liquid separated and dried to obtain diatomite concentrate.
SiO in the diatomite concentrate obtained in this example 2 The grade is 85.35 percent, and the recovery rate is 59.48 percent.
Example 2: the clay-type ultra-low grade diatomite purification method processes certain clay-type ultra-low grade diatomite (SiO) 2 47% of content), and the specific steps are as follows:
(3) Crushing and grinding the ultralow-grade diatomite, wherein the grinding concentration is 45%, grinding the diatomite to the granularity of-0.1 mm, and filtering ore pulp after grinding to obtain filter residues;
(4) Mixing the filter residues in the step (1) and then performing four-section scrubbing, wherein the section I adopts ultrasonic scrubbing, the scrubbing concentration is 25%, the dispersant sodium hexametaphosphate is added, the reagent concentration is 0.3%, the stirring intensity is 900r/min, the scrubbing time is 8min, the sedimentation time is 25min, the obtained suspension is subjected to section III non-ultrasonic scrubbing, and the bottom residues are subjected to section II non-ultrasonic scrubbing; the scrubbing concentration of the II section without ultrasonic scrubbing is 28%, the dispersant sodium hexametaphosphate is added, the agent concentration is 0.5%, the stirring intensity is 900r/min, the scrubbing time is 55min, the sedimentation time is 20min, the obtained suspension liquid is subjected to III section scrubbing, and the bottom slag becomes tailing I; the scrubbing concentration of the section III without ultrasonic scrubbing is 25%, a pH regulator sodium hydroxide is added to adjust the pH value to 9, the scrubbing time is 45min, the sedimentation time is 10h, the obtained bottom slag is subjected to section IV without ultrasonic scrubbing, and the suspension is tailings II; the scrubbing concentration of the section IV without ultrasonic scrubbing is 26%, a pH regulator sodium hydroxide is added to adjust the pH value to 9, the scrubbing time is 45min, the sedimentation time is 14h, the obtained bottom slag is coarse and fine diatomite, and the suspension returns to the section III without ultrasonic scrubbing to form closed cycle;
(3) Removing iron from the coarse and refined diatomite obtained in the step (2) by adopting a method of firstly weakening magnetism and then strengthening magnetism, wherein the strength of a weak magnetic separation magnetic field is 3000GS, obtaining a non-magnetic material, and then filtering and drying the non-magnetic material;
(4) Roasting the nonmagnetic material in the step (3) by using a muffle furnace at the roasting temperature of 800 ℃ for 2 hours to obtain a roasting product;
(5) And (3) carrying out sulfuric acid leaching on the roasting product obtained in the step (4), wherein the concentration of sulfuric acid is 25%, the leaching temperature is 95 ℃, the liquid-solid ratio is 5:1, the leaching time is 1.5h, and the obtained leaching slag is sequentially washed, solid-liquid separated and dried to obtain diatomite concentrate.
SiO in the diatomite concentrate obtained in this example 2 The grade is 86.84 percent, and the recovery rate is 62.87 percent.
Example 3: the clay-type ultra-low grade diatomite purification method processes certain clay-type ultra-low grade diatomite (SiO) 2 The content of 50 percent) is purified by the following specific steps:
(5) Crushing and grinding the ultralow-grade diatomite, wherein the grinding concentration is 40%, grinding the diatomite to the granularity of-0.1 mm, and filtering ore pulp after grinding to obtain filter residues;
(6) Mixing the filter residues in the step (1) and then performing four-section scrubbing, wherein the section I adopts ultrasonic scrubbing, the scrubbing concentration is 35%, the dispersant sodium hexametaphosphate is added, the reagent concentration is 0.4%, the stirring intensity is 1000r/min, the scrubbing time is 5min, the sedimentation time is 35min, the obtained suspension is subjected to section III non-ultrasonic scrubbing, and the bottom residues are subjected to section II non-ultrasonic scrubbing; the scrubbing concentration of the II section without ultrasonic scrubbing is 25%, the dispersant sodium hexametaphosphate is added, the agent concentration is 0.4%, the stirring intensity is 1000r/min, the scrubbing time is 60min, the sedimentation time is 30min, the obtained suspension liquid is subjected to III section scrubbing, and the bottom slag becomes tailing I; the scrubbing concentration of the section III without ultrasonic scrubbing is 30%, a pH regulator sodium hydroxide is added to adjust the pH value to 10, the scrubbing time is 40min, the sedimentation time is 8h, the obtained bottom slag is subjected to section IV without ultrasonic scrubbing, and the suspension is tailings II; the scrubbing concentration of the section IV without ultrasonic scrubbing is 30%, a pH regulator sodium hydroxide is added to adjust the pH to 10, the scrubbing time is 50min, the sedimentation time is 16h, the obtained bottom slag is coarse and fine diatomite, and the suspension returns to the section III without ultrasonic scrubbing to form closed cycle;
(3) Removing iron from the coarse and refined diatomite obtained in the step (2) by adopting a method of firstly weakening magnetism and then strengthening magnetism, wherein the weak magnetic separation magnetic field strength is 3000GS, and the strong magnetic separation magnetic field strength is 0.8T, so as to obtain a non-magnetic material, and then filtering and drying the non-magnetic material;
(4) Roasting the nonmagnetic material in the step (3) by using a muffle furnace at the roasting temperature of 500 ℃ for 1.8 hours to obtain a roasting product;
(5) And (3) carrying out sulfuric acid leaching on the roasting product obtained in the step (4), wherein the sulfuric acid concentration is 30%, the leaching temperature is 90 ℃, the liquid-solid ratio is 6:1, the leaching time is 1.8 hours, and the obtained leaching slag is sequentially washed, solid-liquid separated and dried to obtain diatomite concentrate.
SiO in the diatomite concentrate obtained in this example 2 The grade is 86.34 percent, and the recovery rate is 65.28 percent.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (4)
1. The clay type ultra-low grade diatomite purification method is characterized by comprising the following specific steps:
(1) Crushing and grinding ultra-low grade diatomite, and filtering ore pulp after grinding to obtain filter residues;
(2) Mixing the filter residues in the step (1) and then carrying out ultrasonic scrubbing, taking the sedimented bottom residues after ultrasonic scrubbing as tailings, carrying out ultrasonic scrubbing-free suspension after ultrasonic scrubbing, wherein the bottom residues after ultrasonic scrubbing are coarse concentrates of diatomite, the ultrasonic scrubbing comprises a section I ultrasonic scrubbing process, the ultrasonic scrubbing-free process comprises a section II, a section III and a section IV ultrasonic scrubbing process, the scrubbing concentration of the section I ultrasonic scrubbing process is 25-35%, the dispersant sodium hexametaphosphate is added, the concentration of the sodium hexametaphosphate is 0.3-0.5%, the stirring intensity is 700-1000 r/min, the scrubbing time is 5-8 min, the sedimentation time is 25-35 min, the obtained suspension is subjected to a section III ultrasonic scrubbing-free bottom residues, the section II ultrasonic scrubbing-free bottom residues are subjected to a section II ultrasonic scrubbing-free bottom residues, the scrubbing concentration of the section II ultrasonic scrubbing-free bottom residues is 25-30%, the dispersant sodium hexametaphosphate is added, the concentration of the sodium hexametaphosphate is 0.3-0.5%, stirring at 700-1000 r/min for 50-60 min for a scrubbing time of 20-30 min, carrying out III-stage non-ultrasonic scrubbing on the suspension obtained by II-stage non-ultrasonic scrubbing, wherein the bottom slag obtained by II-stage non-ultrasonic scrubbing is tailings I, the scrubbing concentration of III-stage non-ultrasonic scrubbing is 25% -30%, and a pH regulator sodium hydroxide is added to adjust the pH value to 9-10, the scrubbing time is 40-50 min, the settling time is 8-12 h, the III-stage non-ultrasonic scrubbing is carried out on the bottom slag, the III-stage non-ultrasonic scrubbing suspension is tailings II, the scrubbing concentration of IV-stage non-ultrasonic scrubbing is 25% -30%, a pH regulator sodium hydroxide is added to adjust the pH value to 9-10, the scrubbing time is 40-50 min, the settling time is 12-16 h, the bottom slag of IV-stage non-ultrasonic scrubbing is coarse concentrate of diatomite, the IV-stage non-ultrasonic scrubbing suspension returns to III-stage non-ultrasonic scrubbing to form closed cycle, ultrasonic scrubbing is performed in a diatomite ultrasonic scrubbing machine;
(3) Removing iron from the rough concentrate of the diatomite in the step (2) by adopting a method of firstly weakening magnetism and then strengthening magnetism to obtain a non-magnetic material, and then filtering and drying the non-magnetic material;
(4) Roasting the nonmagnetic material in the step (3) to obtain a roasting product;
(5) And (3) carrying out sulfuric acid leaching on the roasting product in the step (4), and washing, solid-liquid separation and drying the obtained leaching slag to obtain diatomite concentrate.
2. The method for purifying clay-type ultra-low grade diatomite according to claim 1, wherein the method comprises the steps of: grinding the ore in the step (1) until the ore grinding concentration is 40-50% and the granularity of the product is-0.1 mm.
3. The method for purifying clay-type ultra-low grade diatomite according to claim 1, wherein the method comprises the steps of: and (4) roasting by using a muffle furnace, wherein the roasting temperature is 500-800 ℃ and the roasting time is 1.5-2 hours.
4. The method for purifying clay-type ultra-low grade diatomite according to claim 1, wherein the method comprises the steps of: in the step (5), the concentration of sulfuric acid is 20-30%, the leaching temperature is 90-100 ℃, the liquid-solid ratio of sulfuric acid to a roasting product is 4-6:1, and the leaching time is 1.5-2 h.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110449119.7A CN112978746B (en) | 2021-04-25 | 2021-04-25 | Clay type ultra-low grade diatomite purification method |
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| CN202110449119.7A CN112978746B (en) | 2021-04-25 | 2021-04-25 | Clay type ultra-low grade diatomite purification method |
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| CN112978746A CN112978746A (en) | 2021-06-18 |
| CN112978746B true CN112978746B (en) | 2023-11-14 |
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| CN103752418A (en) * | 2014-01-20 | 2014-04-30 | 东北大学 | Low-grade diatomite purification method |
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| CN105149084A (en) * | 2015-07-23 | 2015-12-16 | 中国石油天然气集团公司 | Dry-wet-method mineral separation method used for African sandy diatomite ore |
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