RU2456101C1 - Method of glass-making sands processing for production of quartz concentrate - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to methods of glass-making sands processing for production of quartz concentrate. Proposed method comprises discharging glass-making sands from blending stack into bin with vibration grate of the screening Ist stage for removal of lumps exceeding 150 mm to be directed to fine and coarse crushing, feeding sand with humidity of 10% and 0.042 wt% of iron oxide from receiving bin by vibration feeder and belt conveyor to screening IInd stage for sizing to 50 mm on vibration screen. Plus thereof is directed to coarse and fine crushing while undersize is directed for drying in drum dryer. Quartz dust of -0.1-to-0mm-size containing 1.05 wt% of iron oxide is caught by dust arrester. Sands with moisture content of 0.5 wt% are fed after drying via directed chute onto vibration screen for I stage of sizing to 4 mm to produce plus directed by belt conveyor to fine and coarse crushing assembly for sizing to -4.0+0.0 mm fraction to be combined with undersize on classification I stage and fed into receiving device of continuous bucket elevator that feeds the product to belt conveyor and into working bin. Therefrom, material is fed via two distributors to classification II and III stages. Plus sized to -4.0+0.8 mm containing 0.035 wt% and plus of the -0.8+0.63 wt%-fraction containing 0.05 wt% of iron oxide is directed to appropriate finished product bin. Undersize of -0.63+0.1 mm is fed via directed chute to 1st stage of magnetic separation at magnetic induction of 0.4 Tl for removal of strong magnetic inclusions. Thereafter nonmagnetic sand fraction is fed to II stage of magnetic separation to remove submagnetic inclusions at induction of up to 1.7 Tl. Nonmagnetic fraction thereof is fed to IV vacuum classification stage to catch fractions of -0.16+0.1 mm containing 0.99 wt% of iron oxide that make finished product, that is, molding sand. After said vacuum classification, the -0.63+0.16 mm-sand fraction is isolated that contains 0.028 wt% of iron oxide making enriched quartz concentrate.

EFFECT: higher quality and yield, reduced labour input.

Description

The invention relates to methods for enriching glass sand to obtain quartz concentrate.

There are many different ways of enriching natural sands, for example, the method of enrichment of vein quartz, known from the patent of the Russian Federation 2042430, published on 08.27.1995 and including crushing sand followed by magnetic separation, or known from the patent of the Russian Federation 2017690, published on 08.15.1994, the method of enrichment of vein quartz, including mechanical crushing of the rock, washing with water, heating to 1000-1100 ° С, thermal crushing, grinding, sieving into the working fraction, magnetic separation, flotation, chemical treatment, washing, filtering, drying and potting. These methods are quite energy-intensive and time-consuming and do not allow the use of sands of various classes.

Closest to the proposed invention is a method of enriching silica sand to obtain a glass concentrate, known from RF patent 2387491, published on 04/27/2010 and including loading silica sand from a stack into two receiving bins with grate grates to remove lump inclusions of more than 150 mm, feeding sand from receiving bins with electrovibration feeders and a conveyor belt for screening according to the class of 15 mm on a vibrating sieve, the direction of the oversize product into the dump and the supply of the undersize washing with sequentially installed belt conveyors into a bucket belt elevator, with which sand is transported to a storage hopper and then downstream for drying to a drum dryer to remove natural moisture up to 0.12% moisture and isolate a fraction of -0.1 mm containing 0.265 wt. % iron oxide, in a separate finished product. The primary removal of strong magnetic inclusions from the sands obtained after drying is carried out using an overhead magnetic separator mounted above a conveyor belt that feeds the sands to a two-stage classification of sands by screening on sequentially installed vibrating screens to obtain fractions of -15.0 + 1.2 in size at the first stage of classification mm and fineness -1.2 + 0.8 mm, containing 0.214 wt.% of iron oxide sent to the dump, and a fraction of the class -0.8 + 0.1 mm sent to the second stage of classification with obtaining FR stocks with a particle size of -0.25 + 0.1 mm, containing 0.249 wt.% iron oxide, directed to the production of building mixtures, and a fraction of -0.8 + 0.25 mm, sent to the first stage of magnetic separation, carried out on a rod magnetic separator with a magnetic induction of 0.45 T to remove strongly magnetic inclusions. Then, the non-magnetic fraction is sent by a belt conveyor to the second stage of magnetic separation, carried out on a roller magnetic separator with a magnetic induction of 1.1-1.8 T, to remove weakly magnetic inclusions from the processed sand and to obtain a non-magnetic fraction, which is the final product - enriched glass concentrate.

The difference of the proposed method from the closest analogue is the use of additional methods of processing and enrichment of the feedstock, which together increase the complexity of using the extracted raw materials, useful extraction of the finished product and can significantly reduce material and labor costs for its production.

The aim of the claimed invention is to increase the complexity of the use of extracted raw materials and useful extraction of the finished product, a significant reduction in material and labor costs for its production and obtaining high quality quartz concentrate.

According to the proposed invention, the method of dry enrichment of glass sands to obtain quartz concentrate includes loading glass sand from an averaging stack into a receiving hopper with a grate vibrating grate of the screening stage I to remove lump inclusions of more than 150 mm, which are sent to the coarse and fine crushing unit, feeding sand, with moisture up to 10% and containing 0.0462 wt.% Iron oxide from the receiving hopper in series with an electro-vibration feeder and belt conveyor for stage II screening by size and 50 mm on a vibrating sieve, the over-sieve product of which is sent to the coarse and fine crushing unit, and the under-sieve product is conveyed by a conveyor belt for drying to a drying drum unit, from the exhaust gases of which a quartz dust of -0.1 + 0 mm is captured by a two-stage dust collection system containing 1.05 wt.% Iron oxide, and removed into a separate finished product, after drying, the resulting sands with a moisture content of up to 0.5 wt.% In directional flow are fed to a vibrating sieve at the stage I of 4 mm particle size classification to obtain a notch the product sent via a conveyor belt to the coarse and fine crushing unit, where, together with the over-sieve products of the I and II stages, the screening process is crushed to obtain a fraction with a particle size of -4.0 + 0.0 mm, which is combined with the under-sieve product of the classification stage I and in directional heat it is fed into the receiving device of the belt bucket elevator, by means of which the processed product is fed to the belt conveyor and then to the consumable hopper, from where the material is equal to dimensionally served at the II and III stages of classification by screening, oversize products of which are -4.0 + 0.8 mm in size, containing 0.035 wt.% iron oxide, and oversize products of -0.8 + 0.63 mm fraction, containing 0.05 wt.% iron oxide, is sent to the appropriate silo of the finished product, and the under-grain product with a particle size of -0.63 + 0.1 mm from each sorting separately, is fed to directional chutes to the 1st stage of magnetic separation with magnetic induction of 0.4 T for removal of strongly magnetic inclusions, after which a non-magnetic fraction of sand is fed to the 11th stage of the magnetic separations for removing weakly magnetic inclusions with magnetic induction up to 1.7 T, the non-magnetic fraction of which is fed to the vacuum IV stage of classification, where fractions of -0.16 + 0.1 mm containing 0.99 wt.% oxide are captured by an aspiration system with two-stage cleaning iron and which are the finished product - foundry sand, after the vacuum stage IV of the classification, a sand fraction of -0.63 + 0.16 mm containing 0.028 wt.% iron oxide and the final product is enriched with quartz concentrate.

The feedstock for producing quartz concentrate according to the proposed enrichment method can be, for example, glass sands of the Tashlinsky deposit, the samples of which were used during laboratory and enlarged technological tests, or the Zykovsky deposit, the sands of which are similar in chemical composition.

Sand after enrichment can be used in the production of window glass, colorless containers and other glass products that require high purity raw materials to obtain translucent glass melt, as well as fine sand fractions that meet the requirements for the production of building mixtures and molding sands for the foundry industry.

Table 1 shows the calculation of the content of iron oxide in the initial fraction of sand, products obtained in the enrichment process, and in the enriched concentrate.

Figure 1 presents the technological scheme of enrichment of quartz sand.

The claimed method is implemented as follows.

Glass sands are loaded from an averaging stack of glass sand into a receiving hopper with a grate vibrating grate of the first stage of screening to remove lump inclusions of more than 150 mm, which are sent to the coarse and fine crushing unit. Sand with a moisture content of 10%, containing 0.0462 wt.% Iron oxide, is sequentially fed by an electro-vibration feeder (PVE-0.6 / 1.6) and a belt conveyor from the receiving hopper to the II stage of screening, 50 mm in size, on a vibrating sieve. The under-sieve product (+50.0 mm) is directed along the directed flow into the coarse and fine crushing unit, and the under-sieve product (-50.0 mm) is sent to the drying drum dryer (BN 2.8-16NU) by a belt conveyor, from the exhaust gases of which A two-stage dust collection system captures silica dust -0.1 + 0.0 mm, containing 1.05 wt.% iron oxide, and is removed into a separate finished product - molding sand. After drying, the resulting sands with a moisture content of up to 0.5 wt.% In directional flow are fed to a vibrating sieve at the stage I of 4 mm particle size classification to obtain an oversize product that is sent via a conveyor belt to a coarse and fine crushing unit, where together with over-grate products The stages I and II of screening are crushed to obtain a fraction with a particle size of -4.0 + 0.0 mm, which is combined with the sublattice product of the classification stage I and fed in directional heat to a belt bucket elevator receiving device (ELG-400), through which the processed product is fed to a conveyor belt and then to a feed hopper. From the feed hopper, the material is fed evenly through two distribution devices at the II and III stages of screening classification (S-2-2000), over-sieve products of which are -4.0 + 0.8 mm in size (industrial product 1) and containing 0.035 wt.% Iron oxide , and the oversize product of the fraction of -0.8 + 0.63 mm (intermediate 2) containing 0.05 wt.% iron oxide is sent to the corresponding silo of the finished product. The fractionated intermediate products (first and second) obtained as a result of processing the starting material are finished products and, as silos accumulate, they are shipped to the consumer. The underlayer product with a particle size of -0.63 + 0.1 mm from each sorting is separately fed through directional flows to the I-st stage of magnetic separation (SMBM 335 × 800) with magnetic induction of 0.4 T to remove strongly magnetic inclusions, after which the non-magnetic fraction fed to the second stage of magnetic separation (SMVI 2M) with magnetic induction up to 1.7 T to remove weakly magnetic inclusions, the non-magnetic fraction of which is fed to the vacuum IV stage of classification, where the two-stage cleaning system (GRP 115-45-5.1, cyclone ЦОК- 10, installation UVP-ST-S-2-FRI-14) catch fra tion sand -0.16 mm + 0.1 containing 0.99 wt.% iron oxide and which is a finished product which as forming batch shipped to the consumer as a molding sand marks 2K ₂ O ₂ O16 sand or II-grade "thin "And" very thin "for the production of building mixtures. After the vacuum of the IV stage of classification, the sand fraction is -0.63 + 0.16 mm, containing 0.028 wt.% Iron oxide, which is the final product - enriched with quartz concentrate, and is fed by two successive belt conveyors to the receiving hopper of the bucket elevator, with which the finished product is transported on a conveyor belt with a plow distributor, providing alternate loading of 4 silos, with a capacity of V = 800 m ³ each, with the possibility of regulating products according to the respective brands.

From silos silica sand is shipped to consumers in closed wagons. Regulation of loading is carried out using flowmeters "Lotus".

To provide a wide range of consumers with finished products in various volumes and packaging, silo banks are equipped with additional directional chutes with gates, through which quartz concentrate is fed sequentially by three belt conveyors to two bins with a capacity of V = 5 m ³ each. One of the bunkers is equipped with a unit for packing products in soft Big-Bag containers, the second for loading closed-type vehicles. For the weighing of shipped products mounted truck scales VA-80-24-4. To control the dispatch of finished products by rail, railway scales Q = 150 t are used.

The sands of the deposit in their natural form in chemical composition meet the requirements of GOST 22551-77 "Quartz sand, ground sandstone, quartzite and vein quartz for the glass industry."

Enriched quartz concentrate OVS-030-V is obtained from the feedstock VS-050-1.

When applying to the processing of raw materials of a different quality, it will be possible to obtain enriched raw materials of the following grades in accordance with GOST 22551, namely:

- from sand grade PS-250 - concentrate grade PB-150-1;

- made of sand grade ПБ-150-1 - concentrate grade Б-100-1;

- from sand of grade B-100-1 - concentrate of grade S-070-1;

- from sand of grade С-070-1 - concentrate of grade ВС-050-1 or ВС-040-1;

- made of sand grade BC-050-1 - concentrate grade BC-030-B;

- from sand of grade BC-030-V - concentrate of grade BC-020-V or OOVS-015-1.

The glass sands enrichment scheme is environmentally friendly. The original mineral and enriched quartz sands are not radioactive.

A table for calculating the content of iron oxide in the initial fraction of sand and in enriched concentrate.

Table 1 Size class, mm Brand ВС-050-1 Brand ВС-030-В Fraction-4.0 + 0.0 mm, wt.% Fraction -0.63 + 0.16 mm, wt.% Yield, wt.% Contents Fe ₂ O ₃ , wt.% Extracted. Fe ₂ O ₃ , wt.% Yield, wt.% The content of Fe ₂ O ₃ , wt.% The recovery of Fe ₂ O ₃ , wt.% -4.0 + 0.8 0.85 0,035 0.65 - - - -0.8 + 0.63 2,39 0.05 2.59 - - - -0.63 + 0.5 4.40 0.02 1.92 4.40 0.02 3.31 -0.5 + 0.315 38.82 0,021 17.66 38.82 0,021 30.53 -0.315 + 0.2 44.26 0,028 26.84 44.26 0,028 46.39 -0.2 + 0.16 7.63 0.09 14.86 5.87 0.09 19.77 -0.16 + 0.1 1,58 0.99 33.87 - - - -0.1 + bottom 0,07 1.05 1,61 - - - Total: 100.00 0.0462 Estimated 100.00 93.35 0.0283 Estimated 100.00 Estimated

Claims (1)

The method of dry enrichment of glass sands to obtain quartz concentrate, which includes loading glass sand from an averaging stack into a receiving hopper with a grate vibrating grate of the screening stage I to remove lump inclusions of more than 150 mm, which are sent to the coarse and fine crushing unit, sand supply with humidity up to 10% and containing 0.0462 wt.% iron oxide from the receiving hopper in series with an electro-vibrating feeder and belt conveyor for the II stage of screening by size of 50 mm on a vibrating sieve, nag the honey product is sent to the coarse and fine crushing unit, and the under-sieve product is sent by a belt conveyor to drying in a drying drum unit, from the exhaust gases of which a two-stage dust collection system capture quartz dust -0.1 + 0 mm, containing 1.05 wt.% oxide iron, and withdrawn into a separate finished product, after drying, the resulting sands with a moisture content of up to 0.5 wt.% in directional flow are fed to a vibrating sieve at the stage I of 4 mm particle size classification to obtain an oversize product directed to and using a conveyor belt to the coarse and fine crushing unit, where, together with the over-sieve products of the I and II screening stages, they are crushed to obtain a fraction with a grain size of -4.0 + 0.0 mm, which is combined with the under-sieve product of the classification stage I and fed in directional flow to the receiving device of the belt bucket elevator, by means of which the processed product is fed to the belt conveyor and then to the consumable hopper, from where the material is distributed uniformly to the stage II and III through two distribution devices by screening, over-sieve products of -4.0 + 0.8 mm in size, containing 0.035 wt.% iron oxide, and over-sieve products in the -0.8 + 0.63 mm fraction, containing 0.05 wt.% iron oxide into the appropriate silo of the finished product, and the under-sizing product with a particle size of -0.63 + 0.1 mm from each sorting is separately fed in directional estruses to the I stage of magnetic separation with magnetic induction of 0.4 T to remove strongly magnetic inclusions, after which the non-magnetic fraction sand is fed to the second stage of magnetic separation to remove weakly magnetic x inclusions with magnetic induction up to 1.7 T, the non-magnetic fraction of which is fed to the vacuum IV stage of classification, where fractions of -0.16 + 0.1 mm containing 0.99 wt.% iron oxide are captured by the aspiration system with two-stage cleaning and which are the finished product - foundry sand, after the vacuum stage IV of the classification, a sand fraction of -0.63 + 0.16 mm containing 0.028 wt.% iron oxide and the final product is enriched with quartz concentrate.

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