CN110976077A - Method for preparing high-purity quartz sand iron concentrate from magnetite associated granular quartz - Google Patents
Method for preparing high-purity quartz sand iron concentrate from magnetite associated granular quartz Download PDFInfo
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- CN110976077A CN110976077A CN201911359772.3A CN201911359772A CN110976077A CN 110976077 A CN110976077 A CN 110976077A CN 201911359772 A CN201911359772 A CN 201911359772A CN 110976077 A CN110976077 A CN 110976077A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
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Abstract
The invention relates to a method for preparing high-purity quartz sand iron concentrate from magnetite associated granular quartz; screening granular quartz grinding ore, returning oversize material to grind again, and removing heavy minerals from undersize material by gravity separation; the gravity concentration fine sand obtains magnetic minerals and non-magnetic quartz minerals through medium magnetism and strong magnetism; fine particles and argillaceous substances of quartz are removed through grading and desliming, graded fine sand is used as an electrical and electronic grade silicon micropowder raw material, and graded settled sand is removed except the quartz particles through flotation; and (3) calcining, water quenching, acid leaching, cleaning and drying the flotation concentrate sand to obtain the high-purity quartz sand. And ball-milling and magnetically separating the magnetic minerals obtained by gravity separation of tailings and magnetic separation to obtain high-grade iron ore concentrate. Tailing mud and tailing sand generated in the mineral separation process are used as novel building material raw materials. The invention can realize the comprehensive utilization of resources and has good economic, social and environmental benefits.
Description
Technical Field
The invention belongs to the field of quartz processing and comprehensive utilization, and particularly relates to a method for preparing high-purity quartz sand iron concentrate from magnetite associated granular quartz.
Technical Field
The high-purity quartz sand is an indispensable raw material in high and new technical fields such as electronic information, aviation, aerospace, military industry and the like, and has a strategic position of playing a key role. With the rapid development of high and new technical fields in China, the demand for high-purity quartz sand is increasingly large, and the quality and the price of products are increasingly high. In recent years, a large amount of high-quality quartz raw materials are imported by high-purity quartz sand enterprises in China to produce high-purity quartz sand, the yield of the high-purity sand is only six-component, and byproducts and tailings of nearly four-component are wasted, so that the resource is greatly wasted, and the production cost of the enterprises is increased.
The fine sand and other associated minerals generated in the processing process of the high-purity quartz sand can be comprehensively utilized, and particularly granite and pegmatite type vein quartz deposits are associated with high-quality feldspar, mica, garnet, black (colored) metal minerals and the like. According to the characteristics of the minerals, a reasonable mineral separation process is determined to comprehensively recover the useful minerals and reduce the emission of pollutants, so that the method is an important way for building green mines and improving comprehensive benefits.
Disclosure of Invention
The invention aims to provide a method for preparing high-purity quartz sand and iron ore concentrate from magnetite associated granular quartz and comprehensively utilizing the high-purity quartz sand and the iron ore concentrate, aiming at overcoming the defects in the prior art. The method can realize the comprehensive utilization of the high-purity quartz sand, the iron ore concentrate, the silicon micro-powder raw material and the tailings (mud).
The technical scheme adopted by the invention is as follows:
a method for preparing high-purity quartz sand iron concentrate from magnetite associated granular quartz is characterized by comprising the following steps:
(1) adding water into magnetite associated granular quartz, feeding the magnetite associated granular quartz into a ball mill for grinding, wherein the grinding mass concentration is 40-60%;
(2) passing the ground product through a high-frequency vibrating screen with mesh opening of 0.15-0.3mm, and returning oversize material to be ground again;
(3) the undersize mineral is reselected by a multi-section spiral chute to obtain reselected quartz concentrate and reselected tailings, and the reselected tailings are heavy minerals and quartz particles containing coated iron; of these, multi-segment spiral chutes are well known devices and gravity sorting, is also a conventional technique.
(4) Performing medium-magnetic and strong-magnetic separation on gravity-selected quartz refined sand to remove impurities, and obtaining nonmagnetic magnetic separation refined sand and magnetic separation tailings;
(5) carrying out hydraulic classification on the magnetic separation refined sand, and carrying out classification overflow to obtain fine sand and mud with the particle size of-0.074 mm, and classifying and reserving classified settled sand with the particle size of +0.074 mm; the thickness of the layer is-0.074 mm, namely less than 0.074mm, and the thickness of the layer is +0.074mm, namely more than 0.074 mm;
(6) carrying out flotation on the graded sand setting to obtain flotation quartz concentrate and flotation tailings of non-quartz minerals;
(7) calcining, water quenching, acid leaching, cleaning and drying the flotation concentrate sand to obtain high-purity quartz sand with the total impurity content lower than 50 mg/kg;
(8) and (3) reselecting tailings in the step (3) and magnetically separating the tailings in the step (4), grinding the tailings by using a steel ball mill, and magnetically separating the ground products to obtain magnetic iron ore concentrate and non-magnetic minerals.
On the basis of the technical scheme, the following further technical scheme is provided:
and (5) using the sludge, the tailings obtained in the step (6) and the nonmagnetic minerals obtained in the step (8) as raw materials of the baking-free aerated brick and the novel wall material.
And (5) desliming the graded overflow fine sand and the sludge to obtain graded fine sand which is used as a raw material of electrical and electronic grade silicon micro powder.
The ball mill in the step (1) is a ceramic lining ball mill, and an ore grinding medium is zirconium oxide;
the magnetic separation in the step (4) is carried out by adopting a flat plate type magnetic separator, and the medium-magnetism medium-intensity magnetic induction intensity is 0.4T-0.6T; then a vertical ring or flat ring high gradient strong magnetic separator is adopted for strong magnetic separation, and the strong magnetic, namely high-intensity magnetic induction intensity is 1.1T-1.7T;
the flotation in the step (6) adopts alkaline flotation and acidic flotation, the pH value of the alkaline flotation is 8-9, and a fatty acid collecting agent is adopted; the pH value of the acidic flotation is 1-4, and sulfonate and amine salt collectors are adopted;
the calcination mode of the step (7) is microwave heating, the temperature is 800-1000 ℃, the concentration of HCl for acid leaching is 6-18 percent, the concentration of HF is 3-10 percent, and HNO is used3One acid or any kind of acid with the concentration of 1-5 percent is mixed for use, the acid leaching temperature is 60-200 ℃, and the drying temperature is not lower than 500 ℃.
The magnetic separation equipment in the step (8) is a drum magnetic separator, the content of the ground product with the granularity of-0.074 mm is not less than 60 percent, and the magnetic induction intensity of the magnetic separation is 0.2T-0.6T.
The invention has the beneficial effects that:
1. the step (1) of the invention adopts a pollution-free ball milling technology, can realize the separation of quartz particles and other minerals such as associated magnetite and the like, and avoids secondary pollution to quartz;
2. according to the invention, the spiral chute is selected for carrying out N times of gravity separation and N times of medium magnetism and strong magnetism combined operation, so that the separation of quartz sand, magnetite and quartz sand particles wrapping iron can be effectively realized, the quality requirement of the quartz sand is ensured, and meanwhile, iron-containing minerals are enriched;
3. the flotation method provided by the invention selects alkaline and acidic flotation and characteristic collectors aiming at different impurity mineral types associated with quartz, and can effectively remove aluminosilicate impurity minerals such as iron oxide, mica and feldspar.
4. The calcination of the invention adopts microwave calcination, and quartz particles containing coated iron can be promoted to burst after water quenching, thereby facilitating the subsequent acid leaching removal.
5. According to the cylindrical magnetic separator for magnetite beneficiation in the step (8), the fully dissociated magnetite and tailings can be effectively separated, and the phenomenon that the tailings are carried in the magnetite beneficiation process to influence the quality of iron ore concentrate is avoided.
6. The invention relates to a method for preparing high-purity quartz sand and iron ore concentrate from magnetite associated granular quartz and comprehensive utilization, belonging to a comprehensive recycling process of magnetite associated quartz ore resources, and the method is used for producing high-quality high-added-value high-purity quartz sand, simultaneously recycling associated magnetite and quartz fine sand and comprehensively utilizing tailings (tailings), wherein no solid waste is discharged in the whole process, and the method has good economic and social benefits.
Description of the drawings:
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
Example one
The quartz particles are selected from granular quartz in foreign places, are in a cementing state, have uniform particle sizes of about 1-2 mm, are black brown in appearance, and mainly comprise quartz, magnetite and ilmenite and contain a small amount of feldspar, mica and the like.
The invention provides a method for preparing high-purity quartz sand iron concentrate by magnetite associated granular quartz, which comprises the following steps with reference to figure 1:
(1) adding water into the granular quartz, feeding the granular quartz into a ball mill for grinding, wherein the concentration of ore pulp is 60%, and the hourly treatment capacity is 30 t/h;
(2) the ground ore passes through a 0.2mm high-frequency vibrating screen, and oversize materials return to be ground again;
(3) mineral with the size of 0.2mm below the screen passes through two spiral chutes to obtain gravity concentration fine sand; reselecting tailings into titaniferous iron ore, magnetite and quartz particles wrapping iron, and entering the step (8);
(4) performing magnetic separation on gravity concentrate (quartz) by medium magnetic induction intensity of 0.4T and high magnetic induction intensity of 1.3T to obtain magnetic separation concentrate (nonmagnetic) and magnetic separation tailings, and performing step (8) on the magnetic separation tailings;
(5) removing-0.074 mm grading overflow from the magnetic separation refined sand through hydraulic grading to obtain graded settled sand with the thickness of +0.074 mm; classifying overflow, desliming to obtain 200-mesh classified fine sand, using the classified fine sand as an electrical grade silicon micropowder raw material, and allowing the sludge to enter the step (9);
(6) carrying out flotation on the graded sand setting, wherein the flotation pH is = 2-3, collecting agents are sulfonate and amine salt, so as to obtain flotation concentrate (quartz) and flotation tailings (feldspar, mica and the like), and the flotation tailings enter the step (9);
(7) calcining the flotation concentrate by microwaves at 850 ℃, then quenching by water, and then carrying out acid leaching at the temperature of 80 ℃ for 6 hours, wherein acid media are HCl with the concentration of 12% and HF with the concentration of 3%; washing and drying the acid-leached quartz sand to obtain high-purity quartz sand;
(8) reselecting tailings in the step (3), grinding the magnetic separation tailings in the step (4) by using a ball mill, wherein the grinding concentration is 55%, the treatment capacity is 9T/h, the content of a ground product of-0.074 mm accounts for 65%, carrying out magnetic separation by using a cylindrical magnetic separator with the magnetic induction intensity of 0.4T to obtain magnetic mineral iron ore concentrate, and feeding nonmagnetic minerals into the step (9);
(9) and (3) using the muddy material obtained in the step (5), the flotation tailings obtained in the step (6) and the nonmagnetic minerals obtained in the step (8) to prepare new building materials such as baking-free aerated bricks and cement.
Several indexes of the concentrate finally obtained are as follows:
example two
The mineral is selected from Viagra vein granular quartz in China, the granular quartz granules are in a cementing state and are gray in appearance, and the main minerals are quartz, magnetite, garnet, biotite, ilmenite, rutile, zircon and the like.
Referring to fig. 1, the following beneficiation steps are employed:
(1) adding water into the granular quartz, feeding the granular quartz into a ball mill for grinding, wherein the concentration of ore pulp is 50%, and the treatment capacity is 20 t/h;
(2) the ground ore passes through a high-frequency vibrating screen with the thickness of 0.15mm, and oversize materials return to be ground again;
(3) obtaining gravity concentrate by passing the undersize through three spiral chutes, wherein the gravity concentrate is rutile, zircon, ilmenite, garnet, magnetite and quartz particles coated with iron, and entering the step (8);
(4) reselecting concentrate (quartz) to obtain magnetic concentrate (nonmagnetic) through medium magnetic induction intensity of 0.5T and high magnetic induction intensity of 1.7T, and entering the step (8) for magnetic minerals (tailings) such as ilmenite, magnetite, biotite and the like;
(5) obtaining 0.15-0.074 mm of graded settled sand from the magnetic separation refined sand through a hydrocyclone, taking the 0.074mm of graded fine sand as a raw material of electronic grade silicon micropowder, and feeding the sludge into the step (9);
(6) carrying out flotation on the graded sand setting, adopting alkaline flotation, taking a fatty acid as a collecting agent, controlling the pH value to be 8-9 to obtain flotation concentrate (quartz), and entering flotation tailings (mica and non-quartz oxidized ore) into the step (9);
(7) heating the flotation concentrate to 950 ℃ by microwave, quenching with water, acid (leaching) and washing, wherein the acid leaching temperature is 150 ℃, the reaction time is 10 hours, and the acid types are HCl, HF and HNO3Mixing acid, pickling quartz sand, cleaning, and drying at 600 ℃ to obtain high-purity quartz sand;
(8) reselecting tailings in the step (3), grinding the magnetic separation tailings in the step (4) by using a ball mill, wherein the grinding concentration is 45%, the treatment capacity is 5T/h, the content of ground products is 70% in a range of-0.074 mm, carrying out magnetic separation by using a cylinder magnetic separator with the magnetic induction intensity of 0.3T to obtain magnetic mineral iron ore concentrate, and feeding nonmagnetic minerals into the step (9);
(9) and (5) tailing sand in the step (6) and non-magnetic minerals and mud in the step (8) are used for preparing new building materials such as aerated concrete.
Several indexes of the concentrate finally obtained are as follows:
the foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner; those skilled in the art can make numerous possible variations and modifications to the present teachings, or modify equivalent embodiments, using the methods and techniques disclosed above, without departing from the scope of the present teachings. Therefore, any simple modification, equivalent replacement, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the protection scope of the technical solution of the present invention.
Claims (4)
1. A method for preparing high-purity quartz sand iron concentrate from magnetite associated granular quartz is characterized by comprising the following steps:
(1) adding water into magnetite associated granular quartz, feeding the magnetite associated granular quartz into a ball mill for grinding, wherein the grinding mass concentration is 40-60%;
(2) passing the ground product through a high-frequency vibrating screen with mesh opening of 0.15-0.3mm, and returning oversize material to be ground again;
(3) the undersize mineral is reselected by a multi-section spiral chute to obtain reselected quartz concentrate and reselected tailings, and the reselected tailings are heavy minerals and quartz particles containing coated iron;
(4) performing medium-magnetic and strong-magnetic separation on gravity-selected quartz refined sand to remove impurities, and obtaining nonmagnetic magnetic separation refined sand and magnetic separation tailings;
(5) carrying out hydraulic classification on the magnetic separation refined sand, and carrying out classification overflow to obtain fine sand and mud with the particle size of-0.074 mm, and classifying and reserving classified settled sand with the particle size of +0.074 mm;
(6) carrying out flotation on the graded sand setting to obtain flotation quartz concentrate and flotation tailings of non-quartz minerals;
(7) calcining, water quenching, acid leaching, cleaning and drying the flotation concentrate sand to obtain high-purity quartz sand with the total impurity content lower than 50 mg/kg;
(8) and (3) reselecting tailings in the step (3) and magnetically separating the tailings in the step (4), grinding the tailings by using a steel ball mill, and magnetically separating the ground products to obtain magnetic iron ore concentrate and non-magnetic minerals.
2. The method for preparing the high-purity quartz sand iron concentrate from the magnetite associated granular quartz, which is disclosed by claim 1, is characterized in that the argillaceous substance obtained in the step (5), the tailings obtained in the step (6) and the nonmagnetic mineral obtained in the step (8) are used as raw materials of baking-free aerated bricks and novel wall materials.
3. The method for preparing the high-purity quartz sand iron concentrate by using the magnetite associated granular quartz as claimed in claim 1, wherein the graded overflow fine sand and the muddy substance obtained in the step (5) are desliming to obtain the graded fine sand which is used as a raw material of electrical and electronic grade silicon micropowder.
4. The method for preparing the high-purity quartz sand iron concentrate by using the magnetite associated granular quartz as the raw material according to the claim 1, the method is characterized in that:
a. the ball mill in the step (1) is a ceramic lining ball mill, and an ore grinding medium is zirconium oxide;
b. the magnetic separation in the step (4) is carried out by adopting a flat plate type magnetic separator, and the magnetic induction intensity is 0.4T-0.6T; then a vertical ring or a flat ring high gradient strong magnetic separator is adopted for strong magnetic separation, and the magnetic induction intensity is 1.1T-1.7T;
c. the flotation in the step (6) adopts alkaline flotation and acidic flotation, the pH value of the alkaline flotation is 8-9, and a fatty acid collecting agent is adopted; the pH value of the acidic flotation is 1-4, and sulfonate and amine salt collectors are adopted;
d. the calcination mode of the step (7) is microwave heating, the temperature is 800-1000 ℃, the concentration of HCl for acid leaching is 6-18 percent, the concentration of HF is 3-10 percent, and HNO is used3Mixing one or any kind of acid with the concentration of 1-5 percent for use, wherein the acid leaching temperature is 60-200 ℃, and the drying temperature is not lower than 500 ℃;
e. the magnetic separation equipment in the step (8) is a drum magnetic separator, the content of the ground product with the granularity of-0.074 mm is not less than 60 percent, and the magnetic induction intensity of the magnetic separation is 0.2T-0.6T.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111841829A (en) * | 2020-06-23 | 2020-10-30 | 中国地质科学院郑州矿产综合利用研究所 | High-value comprehensive utilization method for quartz sandstone |
| CN111874914A (en) * | 2020-07-24 | 2020-11-03 | 武汉理工大学 | Method for preparing 4N high-purity quartz sand by taking pegmatite quartz as raw material |
| CN112676029A (en) * | 2020-12-04 | 2021-04-20 | 鞍钢集团矿业有限公司 | Method for preparing water glass by using purified iron tailings |
| CN113231193A (en) * | 2021-05-14 | 2021-08-10 | 中国地质科学院郑州矿产综合利用研究所 | Method for preparing high-purity quartz sand from kaolin tailings |
| CN114378026A (en) * | 2021-12-17 | 2022-04-22 | 中建材蚌埠玻璃工业设计研究院有限公司 | Method for preparing electronic grade high-purity quartz sand |
| CN114405659A (en) * | 2022-01-22 | 2022-04-29 | 鹤山市鸿盛石场有限公司 | Process method for producing ceramic material based on granite machine-made sand tailings |
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| CN114378026A (en) * | 2021-12-17 | 2022-04-22 | 中建材蚌埠玻璃工业设计研究院有限公司 | Method for preparing electronic grade high-purity quartz sand |
| CN114405659A (en) * | 2022-01-22 | 2022-04-29 | 鹤山市鸿盛石场有限公司 | Process method for producing ceramic material based on granite machine-made sand tailings |
| CN114405659B (en) * | 2022-01-22 | 2024-03-12 | 鹤山市鸿盛石场有限公司 | Technological method for producing ceramic material based on granite machine-made sand tailing mud |
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Application publication date: 20200410 |