Method to process nepheline ores to produce alumina and soda products

FIELD: mining.

SUBSTANCE: method includes preparation of a nepheline-lime-soda charge, its sintering in a tubular rotary furnace by heat released when burning fossil coal. After sintering, leaching, desiliconisation and carbonisation of an aluminate solution is carried out to produce alumina and soda products. The fossil coal to burn is a brown coal, the solid residue of which contains calcium oxide CaO of at least 30 wt %, and silicon oxide SiO2 of not more than 40 wt %. Brown coal from the Kansko-Achinskiy field is burnt.

EFFECT: reduced consumption of lime in charge preparation and lower content of silicon oxide in an aluminate solution, using a less scarce fossil coal as fuel.

2 cl, 2 tbl, 1 ex

 

The invention relates to alumina industry, more specifically to the processing of alkaline aluminium-containing raw materials, mainly nepheline and evelinapetrova rocks, ores and concentrates sintering method.

There is a method of processing nepheline ores to obtain alumina and soda derivatives; including preparation of nepheline-lime-soda mixture, sintering in a tubular rotary kiln due to the heat released by the combustion of fuel, the subsequent leaching, obestsenivaya and carbonation aluminate solution with obtaining alumina and soda derivatives;. At the same time to charge set lime-silica ratio of CaO:SiO2= 2,00±0,05 and believe that this relationship will continue in the Speke [1].

The disadvantage of this method applied to the present time in the production of alumina by the method of sintering, associated with spending large amounts of limestone Pandwho is usually in charge of up to 50% of its weight [2], which reduces the productivity of the furnace sintering. It was originally set lime-silica ratio of CaO:SiO2called lime module charge Mand SHZat the entrance to the furnace and, consequently, lime module guardianship Mand NWat the exit from the oven.

The closest in technical essence and the achieved result is a method of processing Nefeli the new ores to obtain alumina and soda derivatives;, comprising preparing nepheline-lime-soda mixture, sintering in a tubular rotary kiln due to the heat generated by burning coal, the subsequent leaching, obestsenivaya and carbonation aluminate solution with obtaining alumina and soda derivatives; [2].

The disadvantage of this method is that the additive will bake the solid residue of combustion of coal reduces the amount of lime module in Speke Mandthat when the batch preparation necessitates additional, against the usual flow of limestone Pand dthat lime increases the modulus of the charge from the specified Mand SHZ=2,00±0,05 before the actual Mand chess Federation.

This reduction in size lime module in Speke due to the fact that in the solid residue burning coal of calcium oxide CaO is contained usually in 2-11 times less than the content of silicon oxide SiO2[3]. While in the solid residue burning coal silicon oxide SiO2contains usually more than 50% (ibid), which increases costs when obestsenivaya obtained by leaching from SPECA aluminate solution, and also leads to increased losses of alumina.

All this, and use as fuel is relatively expensive coal results in high costs of this method.

The problem to which the invention is directed, is to reduce costs. Achieve the same technical result is to reduce the consumption of limestone in the preparation of the charge and the reduction of the content of silicon oxide SiO2in aluminate solution, and also to use as fuel more affordable, consequently, cheaper fossil coal.

This problem is solved and the technical result is achieved in that in the method of processing nepheline ores to obtain alumina and soda derivatives; including preparation of nepheline-lime-soda mixture, sintering in a tubular rotary kiln due to the heat released by the burning of fossil coal, subsequent leaching, obestsenivaya and carbonation aluminate solution with obtaining alumina and soda derivatives; according to the invention as fossil coal combustion using brown coal, the solid residue of combustion which contains calcium oxide CaO not less than 30 wt.%, and silicon oxide SiO2not more than 40 wt.%. When you use burning brown coal Kansk-Achinsk basin.

The difference between the claimed invention from the known [2] is that as fossil coal combustion using brown coal.

It is the use of combustion of brown coal, the solid residue of sgig the deposits which contain abnormally high, in comparison with the solid residue in the combustion of coal, the amount of calcium oxide and a lower amount of silicon oxide, ensures the achievement of the previously mentioned technical result: reduction of consumption of limestone in the preparation of the charge, reducing the content of silicon oxide aluminate solution and use as fuel cheaper fossil coal.

Below in table 1 are provided in accordance with the data source [3] the average chemical composition of the solid residue of combustion (for short: ash) brown coal Kansk-Achinsk basin and coal of a number of fields and swimming pools.

Table 1
The name of the field and the poolThe chemical composition of the ash on without sulfate mass %
SiO2Al2O3Fe2O3CaOMgOK2ONa2OTiO2
The Kansk-Achinsk basin33,512,3 11,136,1of 5.40,90,7-
(brown coal)
Fossil fuels
Deposits of Central Asia42,421,312,417,23,41,51,20,6
Dnieper basin55,2of 17.57,215,32,10,61,01,1
Field Behold the EPO-Eastern regions 48,922,812,19,92,61,41,50,8
The Eastern field51,226,49,57,82,41,20,70,8
Siberia
The Lviv-Volyn basin44,122,620,57,51,72,10,60,9
Kuznetsk basin55,824,96,87,31,61,8 0,90,9
Deposits of the Ural52,423,713,35,61,81,40,71,1
Deposits of Kazakhstan56,725,76,05,51,51,32,11,2
The Far field56,125,27,1of 5.41,62,51,40,7
East

For example, nepheline ore Kiya-shaltyrskogo field is processed in furnaces sintering OJSC "RUSAL Achinsk" (same: AGK). These truncatewords ovens have an internal diameter of 5 m and a length of 185 meters On the section of the furnace where the combustion temperature reaches 1550-1650°C. as the main fuel you currently use coal from the Kuznetsk basin mark T.

In 2010, in accordance with technical requirements of the RUS-Engineering" LLC "Krasnoyarsk boiler factory produced the first heat calculation furnace sintering, working in the Kuznetsk coal basin, and then heat the calculation of the same sintering furnace, if it works on brown coal from the Kansk-Achinsk basin [4].

Based on these calculations, the conclusion about the possibility of maintaining the current thermal circuit in the furnace sintering OJSC "RUSAL Achinsk", if it works on the specified lignite fired.

The authors of the present invention is made more approximate calculations necessary to evaluate the impact of processing nepheline ore changes in the ash content of the coal when the translation work sintering furnace with coal for brown coal.

Initial data for the heat of combustion, the solid residue of combustion of coal [4], chemical composition of solid residues (angry) [3], the results of the calculations referred to 1000 kg combustion of brown coal, and other indicators are summarized in table 2.

Table 2
Index Coal
StoneBrown
The lower heat of combustion, kJ/kg2512015660
Fuel consumption, kg623,411000
The amount of ash, %14,67,0
The amount of ash, kg91,0270,00
The content of CaO in the ash, %7,336,1
The content of CaO in the ash, kg6,6425,27
The content in the ash SiO2, %55,833,5
The content in the ash SiO2kg50,7923,45
The content in the ash K2O %1,80,9
The content in the ash Na2O %0,90,7
The content in the ash Fe2O3, % 6,811,1
The content in the ash Al2About3, %24,912,3
The content in limestone CaO, %54,054,0
The specific content in the mixture of limestone [2, 2.4]0,418-
The relative size of the SPECA from the mixture, % [2, table]54,0-
Performance furnace will bake [5, str], t/h101-103-
Hourly fuel consumption, t/h [4, p.71]-36,083
Molar ratio in the ashes
CaO/SiO20,1311,078
Na2O/Al2O3+Fe2O30,0280,030
(Na, K)2O/Al2O30,11 0,13
(Na, K)2O/Al2O3+Fe2O30,0850,068

In table 2, the data allow us to establish the following:

1. The combustion of one tonne of brown coal on the furnace ASC will provide a decrease in the charge of calcium oxide against the existing on 18,63 kg and, respectively, a decrease of limestone in the preparation of the charge 34.5 kg This allows you to increase the volume of the charge of new versus existing structure on the same 34,5 kg, the production of SPECA on 18,63 kg and alumina on 18,63 kg: 8,0 = 2,33 kg [5, p. 359].

Per hour sintering furnace burns brown coal 36,083 t (see table 2), which provides a reduction of limestone in the preparation of the charge on 1244,86 kg. This allows you to increase the amount of charge on the same 1244,86 kg, the production of SPECA on 672,23 kg and alumina on 83,07 kg

2. On AGK average productivity furnace will bake, running on coal, equal 102000 kg/h [5, str-138]. When operating such a furnace lignite fired her performance will bake to increase by 672,23:102000×100=0,66%.

3. The combustion of one tonne of brown coal on the furnace ASC will provide a reduction in the content of silicon oxide SiO2against the existing in Speke on 50,79 kg - 23,45 kg = 27,34 kg. Per hour of operation of the furnace will burn 36,083 tons of brown coal, the content of silicon oxide in Speke will decrease n the 27,34×36,083=986,51 kg

This reduction of silicon oxide in Speke reduce costs obestsenivaya obtained by leaching from SPECA aluminate solution and reduce the loss of alumina as when obestsenivaya solution, and during its decomposition by carbonization and decomposition. Simultaneously are shown in table 2 molar ratio in the solid combustion residues (ash) indicate that replacement furnaces sintering of coal for brown coal does not lead to significant negative consequences in the production of associated soda derivatives;.

Example. Nepheline ore processing for obtaining alumina and soda derivatives; produced by sintering furnaces OJSC "RUSAL Achinsk", which for a long period of time as the primary fuel used coal from the Kuznetsk basin. This is achieved in furnaces sintering temperature is recognized as optimal [4], and lime module SPECA Mand NWadopted unchanged. Thermal calculations [4], performed by well-known methods [6]showed the possibility to save the current thermal circuit in furnaces sintering in the case of their work on brown coal from the Kansk-Achinsk basin.

Implementation of the proposed method on these furnaces sintering can be done after their reconstruction and consists, primarily, in the adjustment of the composition of the charge to reflect changes in the composition of the perches and will bake solid residues from the burning of fossil coal and structural and technological changes in the preparation of the coal for combustion and flow into the furnace sintering. If necessary can be modified in the existing process flow processes, including leaching, obestsenivaya and carbonation aluminate solution.

Implementation of the proposed method produced the following.

On the basis of existing in Speke lime-kremnievoi relationship CaO: SiO2i.e. lime module SPECA Mand NWthe amount and composition of the solid residue of combustion of brown coal, characterized by a content of calcium oxide CaO 36.1% and SiO233,6%, by well-known methods, for example [7], calculate the value of reduction of limestone in the preparation of the charge. According to the approximate calculation of the applicant per hour sintering furnace lignite coal consumption of limestone in the preparation of the charge can be reduced by 1244,86 kg, which can be considered as the increase of the charge of new versus existing, the composition also 1244,86 kg. This will increase the production of SPECA on 672,23 kg and alumina on 83,07 kg

Such relatively high, reducing the consumption of limestone virtually no effect on existing equipment, ensuring the preparation of nepheline-lime-soda mixture (crushing ore and limestone, separate grinding and dosing) and submission watered charge by filling in the low-temperature part of the furnace.

Significant, approximately ,6 times (25120 kJ/kg:15660 kJ/kg), the increase in coal combustion necessitates a substantial increase in the productivity of existing equipment, ensuring the reception of coal (bunker), grinding coal mill, coal injection air through the pulverized coal burners, as well as an increase in the geometry of the burners and their number.

Because the amount charged metal at the top (caudal) part of the preheated oven, the proposed method remains unchanged, so if the movement of the charge towards the gases resulting from the combustion of coal in the head part of the furnace processes occur without changes. While processed foods in the form of SPECA, formed due to the heat emitted during the combustion of brown coal, proceed in the refrigerator and the gaseous products of combustion of coal together with the process gases are directed into the gas purification system.

The cooled sintered crushed and sent for leaching. Resulting aluminate solution in accordance with the technological scheme of production is directed to obestsenivaya and carbonization and subsequent receipt of alumina and soda derivatives; types of soda and potash. As in Speke, and in the aluminate solution reduced the content of silicon oxide SiO2that simplified obestsenivaya and reduced it costs and losses at the time of receipt of alumina, and with whom coproductive.

When the reconstruction of the refinery furnaces sintering, it is advisable to solve a number of additional tasks that are not provided by the claimed invention, for example, to organize a closed scheme drying with direct fuel injection [4].

A more complete economic efficiency of the proposed method of processing nepheline ores of different composition, including evelinapetrova raw materials, applied specific sintering furnace can be determined during the development of the project with regard to all the processing undertaken by integrated processing of aluminium-containing raw materials and taking into account the prices of fossil fuels.

Sources of information

1. Liner A.I., Eremin NI, Liner Y.A., Pevzner I.Z. alumina Production. - M.: metallurgy, 1978. P.184-193.

2. Abramov VA, A.I. Alekseev, Badalian HA Complex processing evelinapetrova raw materials. - M.: metallurgy, 1990. P.36-46).

3. Recommendations for designing gears of thermal power stations: P 26-85. / VNIIG, L., 1986. P.74-76.

4. Justification the possibility of organizing a specified temperature in sintering furnaces OJSC "RUSAL Achinsk" using brown coal Kansk-Achinsk basin. Mikhailenko S.A., Masalsky G.B., Kapustin p. g and other OOO Krasnoyarsk boiler factory, 2010.

5. Complex processing of aluminium-containing alkaline materials. Arluk B. I., Liner Y.A pivnev A.I. - M.: metallurgy, 1994.

6. The technique of sintering of the charge alumina industry. Khodorov H., Shmargunenko NS - M: metallurgy, 1978.

7. The patent of Russian Federation №2259945, CL C01F 7/38, publ. 10.07.2005.

1. A method of processing nepheline ores to obtain alumina and soda derivatives; including preparation of nepheline-lime-soda mixture, sintering in a tubular rotary kiln due to the heat released by the burning of fossil coal, subsequent leaching, obestsenivaya and carbonation aluminate solution with the subsequent receipt of alumina and soda derivatives;, characterized in that as fossil coal combustion using brown coal, the solid residue which contains calcium oxide CaO not less than 30 wt.%, and silicon oxide SiO2- not more than 40 wt.%.

2. The method according to claim 1, characterized in that use lignite Kansk-Achinsk basin.



 

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2 cl, 1 tbl, 7 ex

FIELD: metallurgy.

SUBSTANCE: facility consists of working chamber installed in case; also working chamber is formed with walls and bottom made out of refractory material and has inlet and outlet openings. The bottom of the working chamber is made step-like in the direction of the outlet opening. A vertical partition not reaching the bottom and a filter element are installed inside the working chamber; also the filter element is secured inside the working chamber between its walls and the vertical partition. A flap cover with heating elements and electro-mechanical drive is arranged in an upper part of the working chamber. The filter element is made as successively arranged porous filter partitions with dimension of pores at the first partition relative to the second one equal to 2/1-2/1.5. The filter partition installed at the inlet opening is arranged with a rise of 3-5 degrees in the direction of metal flow to the side of the outlet opening, while the filtering partition at the outlet opening is installed horizontally. Not less, than one opening is made in the cover; industrial drying fans are arranged over the opening, while the case is mounted on the bed with a tilt.

EFFECT: upgraded degree of metal purification, reduced labour cost for maintenance and expanded process functionality of facility.

3 dwg

FIELD: metallurgy.

SUBSTANCE: agglomerate contains pentaoxide of vanadium 0.2-2.0 %, oxide of calcium 0.1-1.2 %, dioxide of silicon 2.0-10.0 %, aluminium oxide 1.5-4.0 %, magnesium oxide 0.8-1.5 %, dioxide of titanium 0.2-2.0 % and iton oxides - the rest.

EFFECT: increased degree of transition of vanadium into slag.

2 tbl, 2 ex

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