RU2387491C1 - Method for dry dressing of quartz sands for production of glass concentrate - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: method for dry dressing of quartz sands for production of glass concentrate includes charging from quartz sand stack into two receiving hoppers with flat grates, to remove lumpy inclusions with size of more than 150 mm, supply of sand from receiving hoppers by electric vibration feeders and belt conveyor for screen sizing according to class 15 mm at vibration sieve, sending oversize product into dump and supply of through product by two serially installed belt conveyors into bucket belt elevator, with the help of which sand is transported into accumulating hopper and further downstream for drying into drum dryer to remove natural moisture down to 0.12% of humidity and extraction of fraction of -0.1 mm, containing 0.265 wt % of ferric oxide into a separate finished product, primary removal of intense magnetic inclusions from sands produced after drying with the help of laminated magnetic separator installed over belt conveyor, which supplies sands to double-stage sizing of sands by means of screen sizing at serially installed vibration screens, with production of fractions at the first stage of sizing with size of -15.0 +1.2 mm, -1.2 +0.8 mm, which contain 0.214 wt % of ferric oxide sent to dump, and fractions having size of -0.8 +0.1 mm sent to the second stage of sizing with production of fraction having size of -0.25 +0.1 mm, which contains 0.249 wt % sent for production of construction mixtures, and fractions of -0.8 +0.25 mm sent for the first stage of magnetic separation performed at roller magnetic separator with magnetic induction of 0.45 tesla to remove intense magnetic inclusions, sending non-magnetic fraction by belt conveyor to the second stage of magnetic separation performed at roller magnetic separator with magnetic induction of 1.1 or 1.7 tesla to remove weakly magnetic inclusions from processed sand and to produce non-magnetic fraction, which is final product - dressed glass concentrate.

EFFECT: improved efficiency of quartz sands dressing and production of high quality concentrate, reduction of labour costs.

1 dwg, 3 tbl

Description

The invention relates to methods for the enrichment of quartz sand in order to obtain a glass concentrate.

There are many different ways of enriching natural sands, for example, the method of enrichment of vein quartz, known from RF patent No. 2042430, published on 08/27/1995 and including crushing sand followed by magnetic separation, or known from RF patent No. 20177690, 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 ° C, thermal crushing, grinding, sieving on the working fraction, magnetic separation, flotation, chemical treatment, washing, filtering, drying and calcination. These methods are quite energy-intensive and time-consuming and do not allow the use of sands of various classes.

The aim of the claimed invention is to reduce labor costs, creating the possibility of enriching the sands of various classes and obtaining glass concentrate of high quality.

According to the proposed invention, a method of dry enrichment of quartz sand to obtain glass concentrate, comprising loading from a stack of quartz sand into two receiving silos with grate grids for removing lumpy inclusions of more than 150 mm, feeding sand from receiving silos with electrically vibrating feeders and a belt conveyor for screening according to 15 mm class on a vibrating sieve, the direction of the over-sieve product into the blade and the supply of under-sieve product with two sequentially installed belt conveyors in lice belt elevator, with which sand is transported to the storage hopper and then downstream for drying to a drum dryer to remove natural moisture up to 0.12% moisture and isolate a -0.1 mm fraction containing 0.265 wt.% iron oxide into 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 the first classification stage mm and fineness of -1.2 + 0.8 mm, containing 0.214 wt.% 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 f 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 to the second stage of magnetic separation by a belt conveyor, 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 raw materials are, for example, dry sands of the Krasnogulyayskoye-II deposit, stored in a stack at an intermediate warehouse near the processing plant.

A number of studies have shown that the source sand of the above deposits is represented by fine and fine-grained material with the following content of basic oxides; SiO ₂ 98.14-99.37% and Fe ₂ O ₃ 0.024-0.14% and a low content of other oxides, and the content of pp and SO _{3 is} very minor. The main impurities in the sand samples are distributed fairly evenly.

Sands in their natural form without additional preparation can be successfully used in the construction industry for the production of mortar, silicate brick and optionally for the production of heavy concrete grade 250, as well as for the production of semi-white glass.

The sands of the deposit in their natural form by chemical composition meet the requirements of GOST 22551-77 "Quartz sand, ground sandstone, quartzite and vein quartz for the glass industry" for the grades BC-030-V, BC-040-1, BC-050-1, C -070-1, B-100-1, PB-150-1, PS-250 and T.

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, and enriched sand meets the requirements for the production of building mixtures.

The mineral composition of the starting material is shown in table 1.

The qualitative characteristics of the quartz sand constituting the deposit are presented in detail in table 2.

Qualitative and quantitative indicators of the proposed method are shown in table 3.

The drawing shows a process diagram of the enrichment of quartz sand.

The claimed method is implemented as follows.

Sand is loaded from a pile of quartz sand by a loader into two receiving hoppers with grate grates to remove lumpy inclusions of more than 150 mm, sand is fed from receiving hoppers by electrovibrating feeders and a belt conveyor for screening according to class 15 mm on a vibrating sieve with the subsequent direction of the grating product into the dump and sub-sieve product feed by two sequentially installed belt conveyors to a bucket belt elevator, with which sand is transported to the drive a hopper and further downstream for drying into 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 into a separate finished product, working in combination with cyclones and others devices providing the necessary technological process parameters, safety and environmental requirements.

In this scheme, a sand fraction is supplied for drying - 15 + 0 mm in the amount of 99.03% according to the balance (Table 1). In the practice of existing plants, drying material is 3.0 mm or less (with the dry enrichment method) and 0.8 mm (with the wet enrichment method).

The primary removal of strong magnetic inclusions from the sands obtained after drying (hardware impurities of iron) is carried out using a tiled magnetic separator mounted above a belt conveyor that feeds the sands to a two-stage classification of sands by screening on sequentially installed vibrating screens to obtain fractions with a size of -15 at the first stage of classification , 0 + 1.2 mm, - 1.2 + 0.8 mm, containing 0.214 wt.% Iron oxide, sent to the dump, and fractions with a particle size of -0.8 + 0.1 mm, sent to the second stage class identification with obtaining a fraction 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 (for example, CMC 15-1K2-AH) to remove strongly magnetic impurities, directing a non-magnetic fraction by a belt conveyor to the second stage of magnetic separation carried out on a roller magnetic separator with magnetic induction 1.1-1, 8 T (e.g. SMRS 12/150-PP) To remove weakly magnetic inclusions from the processed sand and obtain a non-magnetic fraction, which is the final product - enriched glass concentrate, which has a very high useful yield in the amount of 93.07% of the feedstock and contains 0.039 wt.% iron oxide (grade BC-040- one). Existing dry enrichment methods for the most part have an extraction in the range of 80.0-85.0%, wet enrichment methods are much lower.

For the purpose of the integrated use of the extracted raw materials, stone is more than 150 mm, fractions of classes more than 15 mm; 1.2 mm; 0.8 mm, including the separated magnetic fraction, consisting of all magnetic products obtained in the process of production of quartz glass concentrate and sent to the dump, can be used for reclamation of quarries, in road construction and for other purposes.

The removal of a fine fraction of -0.25 mm at the II stage of classification and a fraction of -0.1 mm during drying allows us to exclude the reclamation of the processed material from the applied operation as the most energy-intensive and thereby significantly reduce the cost of production. In addition, the removal of a fine fraction of -0.25 mm increases the efficiency of dry magnetic separation of the productive class by improving the contact of quartz grains with the separator rollers directly in the separation zone and allows for the same parameters of magnetic induction to achieve a higher depth of purification of the processed material from the magnetic component of the raw material , which is confirmed by the quality of the finished concentrates obtained, suitable for the production of colored and colorless containers, as well as float glass (FR. -0.8 + 0.25 mm) corresponding to the brands: С- 070-1; BC-050-1; BC-040-1; BC-030-V according to GOST 22551-77 “Quartz sand, ground sandstone, quartzite and vein quartz for the glass industry. Specifications ", for the construction industry - sand according to GOST 8736-93" Sand for construction work. Technical conditions. "

Enriched sand meets the following specifications:

1. Glass sand brand S-070-1 fr. -0.8 + 0.25 mm according to GOST 22551-77.

Chemical composition:

The content of SiO ₂ is not less than 98.5%.

Fe ₂ O ₃ - not more than 0.07%.

Al ₂ About ₃ - not more than 0.6%.

Grading:

The number of sand grains larger than 0.8 mm - not more than 0.5%.

The number of grains of sand finer than 0.1 mm - not more than 1%.

Mass fraction of moisture - not more than 0.5%.

2. Glass sand brand BC -050-1 fr. -0.8 + 0.25 mm according to GOST 22551-77.

Chemical composition:

The content of SiO ₂ is not less than 98.5%.

Fe ₂ O ₃ - not more than 0.05%.

Al ₂ O ₃ - not more than 0.6%.

Grading:

The number of sand grains larger than 0.8 mm - not more than 0.5%.

The number of grains of sand finer than 0.1 mm - not more than 1%.

Mass fraction of moisture - not more than 0.5%.

3. Glass sand of the brand BC-040-1 fr. -0.8 + 0.25 mm according to GOST 22551-77.

Chemical composition:

The content of SiO ₂ is not less than 98.5%;

Fe ₂ O ₃ - not more than 0.04%.

Al ₂ O ₃ - not more than 0.6%.

Grading:

The number of sand grains larger than 0.8 mm - not more than 0.5%.

The number of grains of sand finer than 0.1 mm - not more than 1%.

Mass fraction of moisture - not more than 0.5%.

4. Glass sand of the brand BC-030-V fr. -0.8 + 0.25 mm according to GOST 22551-77.

Chemical composition:

The content of SiO ₂ is not less than 98.5%.

Fe ₂ O ₃ - not more than 0.03%.

Al ₂ O ₃ - not more than 0.6%.

Grading:

The number of sand grains larger than 0.8 mm - not more than 0.5%.

The number of grains of sand finer than 0.1 mm - not more than 1%.

Mass fraction of moisture - not more than 0.5%.

5. Quartz sand fraction - 0.25 mm for the production of building mixtures according to GOST 8736-93.

6. Sand molding fraction less than 0.1 mm for the foundry industry in accordance with GOST 2138-91.

The quality of quartz sand is confirmed by certification tests conducted by Samara Testing and Certification Center LLC on April 30, 2008.

In accordance with the findings:

- these sands by grain composition and modulus of fineness (the total residue on sieve 0.63 is from 0.17 to 0.41%, Mk from 1.0 to 1.5) belong to the group of very fine sands;

- the presence of foreign impurities and impurities in them was not detected;

- clay is completely absent in the lumps, and the content of dusty, clay and silty particles is from 0.07 to 0.22%, which is significantly less than that stipulated by GOST 8736-93;

- the specific effective activity of radionuclides in samples is less than 370 Bq / kg, which makes it possible to classify the material as the first class of building materials and to use it in all types of construction.

According to the results of tests carried out by Interface companies in Ulyanovsk and OOO Tareks NPF, Moscow, the quartz sand of the Krasnogulyaysky-II deposit in terms of grain composition complies with GOST 22551-77 “Quartz sand, ground sandstone, quartzite and vein quartz for the glass industry. Technical conditions ”, as well as in accordance with GOST 8736-93“ Sand for construction work. Technical conditions ”refers to the group of very fine sands.

The main consumers of Tashlinsky GOK products are: Simbirskoye Stroymaterialy LLC, Salavatsteklo LLC, BM Astrakhansteklo LLC, Saratovsteklo TD, Baumit Dry Mixes LLC.

Table 1 The mineral composition of the source material of the Krasnogulyayskoye-II deposit Minerals Fraction, mm +0.5 -0.5 + 0.25 -0.25 + 0.1 Whole sample Qty % Qty % Qty % Qty % 1.Quartz is pure 323 80 310 74 320 73 953 76 2. Matt quartz 62 16 92 22 83 19 237 19 3. Quartz slightly ironic 3 one 3 one eighteen four 24 2 4. Quartz with inclusions 9 2 fourteen 3 twenty four 43 3 5. Quartz with a gray coating 3 one - - - - 3 grain unit Total 400 one hundred 419 one hundred 441 one hundred 1260 one hundred

table 2 Distribution of sands by their trademarks at production horizons Mining horizons Volume,%, of sands of various grades in the mining horizon The average quality of the source sand over the horizons BC-030-B BC-050-1 S-070-1 B-100-1 PB-150-1 PS-250 one 2 3 four 5 6 7 8 283 m 6 29th 25 fourteen 23 3 B-100-1 273 m 3 40 42 10 5 - S-070-1 263 m 2 61 29th four four - S-070-1 253 m 2 62 25 eleven - - S-070-1 243 m - 57 38 5 - - S-070-1 233 m - 33 fifty 17 - - S-070-1 Weighted average 2 47 35 10 four 2 S-070-1

Claims (1)

A method of dry enrichment of quartz sand to produce glass concentrate, which includes loading quartz sand from a stack of sand into two receiving hoppers with grate grates to remove lumpy inclusions of more than 150 mm, feeding sand from receiving hoppers with electro-vibration feeders and a conveyor belt for screening according to class 15 mm on a vibrating sieve , the direction of the oversize product into the blade and the supply of the under-sieve product with two sequentially installed belt conveyors into the bucket belt elevator, using which sand is transported to the storage hopper and further downstream for drying to a drum dryer to remove natural moisture to 0.12% moisture and to isolate a fraction of -0.1 mm containing 0.265 wt.% iron oxide in a separate finished product, primary removal strong magnetic inclusions from sands obtained after drying using a tiled magnetic separator mounted above a conveyor belt feeding sands to a two-stage classification of sands by screening on sequentially installed vibrating screens, with at the first stage of classification of fractions with a fineness of -15.0 + 1.2 mm, -1.2 + 0.8 mm containing 0.214 wt.% iron oxide sent to the dump, and fractions with a fineness of -0.8 + 0.1 mm, sent to the second stage of classification with obtaining fractions with a particle size of -0.25 + 0.1 mm, containing 0.249 wt.% iron oxide, directed to the production of building mixtures, and fractions -0.8 + 0.25 mm, sent to the first a magnetic separation stage carried out on a roll magnetic separator with a magnetic induction of 0.45 T to remove strongly magnetic inclusions, the direction of tape co Nweyer of the non-magnetic fraction to the second stage of magnetic separation carried out on a roller magnetic separator with magnetic induction of 1.1 or 1.7 T to remove weakly magnetic inclusions from the processed sand and to obtain a non-magnetic fraction, which is the final product enriched in glass concentrate.

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