Foreword
According to the requirements of the Ministry of Housing and Urban-Rural Development "Notice on the issuance of 2019 engineering construction specifications and standards preparation and related work plan" (Jianbiao letter [201938]), the standard preparation team revised this standard after extensive investigation and research, seriously summarizing practical experience, referring to relevant domestic standards and international experience, and on the basis of extensive consultation.
The main technical content of this standard: general, terminology, basic provisions, raw materials, auxiliary materials and fuels, raw materials and fuel storage and transportation and bauxite crushing, lime firing and lime milk preparation, slurry preparation, pre-desilication and dissolution, clinker firing and crushing, clinker dissolution, red mud separation and washing and filtering, control filtration and concentrate cooling, sintering method of desilication of crude liquor, sodium bauxite solution decomposition, aluminum hydroxide separation and washing and storage, mother liquor Evaporation and lye blending cleaning facilities, aluminum hydroxide roasting and product packaging and stacking.
The main content of the revised standard.
1. revised the scope of application, adding the provisions applicable to trihydrate alumina type and mixed bauxite.
2. Adjusted the terminology.
3. Increased the design requirements for alumina production auxiliary materials, Bayer red mud filtration, flocculant preparation red mud discharge, red mud filtering, concentrate cooling, seed filtration, liquid alkali unloading storage and solid alkali alkali, alkali washing station, hot water station, acid washing station, etc.
4. Cancelled the content of bauxite ore dressing
This standard is managed by the Ministry of Housing and Urban-Rural Development
1 General Provisions
1.0.1 In order to unify the technical requirements of alumina plant process design, promote technological progress, improve the quality of design, to achieve technologically advanced, economically reasonable, safe and reliable, the development of this standard.
1.0.2 This standard applies to new, expanded and rebuilt to a water hard alumina type, trihydrate alumina type and mixed bauxite as raw materials, the production of metallurgical alumina alumina plant process design.
1.0.3 alumina plant process design shall comply with this standard, in addition to the provisions of the relevant national standards in force
2 Terminology
2.01alumina stable oxide of aluminum with many different crystalline forms, the molecular formula AlO.
2.0.2aluminium hydroxide decomposed by sodium aluminate solution precipitated from the knotted substance molecular formula A1 (OH).
2.0.3 metallurgical grade alumina smelter grade alumina molten salt electrolytic production of aluminum metal used alumina.
3 basic provisions
3.0.1 The overall planning of alumina plant should comply with the following provisions: It is appropriate to use a planning, phased construction program.
2 expansion and reconstruction design should use the original production facilities, public utilities and living facilities, and should reduce the impact on production.
3 energy consumption, resource consumption and comprehensive utilization should comply with the current national standard "circular economy evaluation of the aluminum industry" GB/T 33858 3.0.2 alumina plant product program should comply with the following provisions.
1 Alumina product quality shall conform to the relevant provisions of the current national standard "Alumina" GB/T 24487 and "Metallurgical grade alumina" YS/T 803 Hydroxide product quality shall conform to the relevant provisions of the current national standard "Aluminum Hydroxide" GB/T 4294; the chemical composition and physical properties of alumina alumina can be determined according to actual needs or user requirements.
4 raw materials, auxiliary materials and fuels
4.1.1 The quality of bauxite should conform to the relevant provisions of the current national standard "Bauxite Ore" GB/T 24483, the particle size of bauxite into the plant should not be larger than 150m, the feed size of ball mill or rod mill should not be larger than 15mm, and the feed size of roller mill should not be larger than 45mm. 4.1.2 The quality of limestone should conform to the relevant provisions of the current industry standard "Limestone for Metallurgy" YB/T 5279. 4.1.3 The quality of soda ash should comply with the current national standard "industrial sodium carbonate and its test method part 1: industrial sodium carbonate" GB 210.1 of the relevant provisions, it is desirable to use I qualified products.
4.1 raw materials
5 raw materials and fuel storage and transportation and bauxite crushing
5.1 Unloading facilities
5.1.1 Use the national road network or railroad line transport when the production capacity of the car equipment should be determined according to the conditions of transport operations.
5.1.2 The choice of unloading equipment shall be in accordance with the following provisions.
Set up a dedicated railroad line, can be used to dump the car.
2 final production scale is greater than 800kt / a, can be used to turn the machine chain bucket unloader or screw unloader.
5.1.3 unloading equipment production capacity, operating shifts and operating hours should be in line with the provisions of Table 5.1.3.
6 Lime firing and lime milk preparation
6.1 Firing
I Vertical kiln firing of lime
6.1.1 carbon dioxide gas and lime need to be supplied at the same time, the production capacity of the kiln should be determined according to the need for the larger. The number of vertical kilns should not be less than 2. 6.1.2 The feed size of limestone, coke or coal should be in accordance with the following provisions.
1 limestone particle size of 40mm ~ 100mm, the maximum particle size and the minimum particle size ratio should be less than 2.2, limestone into the vertical density should be set before the screening device.
2 When coke is used as fuel, the particle size should be 25mm~40mm.
7 Slurry preparation
7.1 Slurry grinding
7.1.1 For Bayer production, the capacity of the mill shall be determined according to the maximum capacity of the dissolution unit; for sinter production, the capacity of the mill shall be determined according to the maximum capacity of the clinker kiln.
7.1.2 Bayer production, slurry grinding can be used lattice or overflow ball mill with hydrocyclone a closed circuit grinding process, or a rod mill open circuit, two sections of the ball mill with hydrocyclone closed circuit of the two grinding process, can also be used a roller mill open circuit, two sections of the ball mill with hydrocyclone closed circuit of the two grinding process, and should be set up screening device; bauxite attached water content greater than 5%, should not use the silver mill process 7.1.3 sintering method of production, raw material slurry grinding process is appropriate to use the tube mill plus screen open circuit grinding process.
8 pre-desilication and dissolution
8.1 Pre-desilication
8.1.1 pre-desilication process settings and process technology conditions, should be determined according to the nature of bauxite and processing test results.
8.1.2 pre-desilication should be used for atmospheric pressure continuous operation; pre-desilication tank should be used in an open-air step configuration. Between the trough over the material should be used self-flow conveying mode, can also use compressed air-assisted lifting mode; between the trough over the material device can be used to close the chute or chute. Pre-desilicon end tank should be set up after the buffer tank and return material pump; pre-desilicon process should be set up to return sand pump
9 clinker firing and crushing
9.1 Coal powder preparation
9.1.1 The production capacity of coal mill should be 1.15 times~1.20 times of the total coal consumption of clinker kiln design.
1.20 times.
9.1.2 The process design of the coal supply system shall conform to the following provisions.
The number of clinker kiln is not more than 3 units, can be used for single-way conveying equipment; clinker 1 kiln clinker more than 3 units, it is appropriate to use a two-way conveying equipment.
2 pulverized coal conveying should take confinement measures.
9.1.3 The process design of the pulverized coal grinding system shall comply with the following provisions.
10 Clinker Dissolution
10.0.1 When low carbon sodium dissolution process is used for clinker dissolution, no additional sodium carbonate may be added to the clinker dissolution process.
10.0.2 sintering method of production, clinker dissolution can be used in a grinding or two grinding dissolution process; clinker dissolution can be used in a grinding dissolution process when using the joint method of production, can also be used in a simple-shaped dissolver, two grinding dissolution process in a ball mill, can also be used in two grinding dissolution process in a ball mill 10.0.3 a grinding or two grinding clinker dissolution equipment should be used 10.0.4 The production capacity of dissolving mill shall be determined by calculation according to actual production data or test results.
11 Red mud separation, washing and filtering
11.1 Mud separation and washing
11.1.1 red mud slurry is appropriate to add flocculants to assist liquid-solid separation operations, the process should be determined according to the maximum feed solids content of the settling tank can meet the requirements of red mud settling operation conditions.
11.1.2 Red mud washing should adopt multiple counter-current washing process, and the content of caustic sodium oxide in the red mud attached liquid discharged to the stockyard should not be more than 5kg per ton of dry red mud.
11.1.3 Bayer method and joint production, Bayer method of red mud settlement separation and washing equipment should be used to deep cone settlement tank or single-layer flat bottom settlement tank.
12 control filtration and concentrate cooling
12.1 Control filtration
Filtration equipment should use vertical pressurized leaf filter, and should be set up to standby leaf filter. 12.1.112.1.2 Feed tank and feed pump settings, should comply with the following provisions.
1 feed pump and leaf filter using a one-to-one configuration, the leaf filter feed pipe should be set up buffer energy-absorbing device, should not set up a backup feed pump.
2 feed pump and leaf filter machine using a multi-to-many configuration, the leaf filter machine feed pipe may not be set up buffer energy-absorbing device, it is appropriate to set up a backup feed pump.
3 feed pump head should be determined according to the working pressure at the end of the feed of the leaf filter machine after calculating the pipeline resistance, and should be used to adjust the speed of frequency conversion.
13 Sintering method of coarse liquid desiliconization
13.1 Coarse liquid desiliconization
13.1.1 The coarse desilication process shall be determined according to the quality of alumina product on the amount of silicon index of the concentrate.
Requirements to determine, and should be in line with the following provisions: 1 concentrate silicon index of 250 ~ 300 can be used to add silicon slag crystal species of atmospheric desilication process, can also be used to add silicon slag crystal species first atmospheric desilication process after pressure desilication; 2 concentrate silicon index of 400 a 500, can be used to add silicon slag crystal species first atmospheric desilication process after pressure desilication.
3 concentrate silicon index of 600-700, can be used to add silicon slag crystal species normal pressure desiliconization, a pressure desiliconization, a sodium-silica slag settlement separation, settlement tank overflow add lime milk or other additives to the work of desiliconization process.
14 sodium aluminate solution decomposition
15 aluminum hydroxide separation washing and storage
16 mother liquor evaporation and lye blending
17Washing facilities
18 aluminum hydroxide roasting and product packaging and storage
Terminology of this standard
List of cited standards
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Foreword
1 General Provisions
2 Terminology
3 basic provisions
4 raw materials, auxiliary materials and fuels
5 raw materials and fuel storage and transportation and bauxite crushing
6 Lime firing and lime milk preparation
7 Slurry preparation
8 pre-desilication and dissolution
9 clinker firing and crushing
10 Clinker Dissolution
11 Red mud separation, washing and filtering
12 control filtration and concentrate cooling
13 Sintering method of coarse liquid desiliconization
14 sodium aluminate solution decomposition
15 aluminum hydroxide separation washing and storage
16 mother liquor evaporation and lye blending
17Washing facilities
18 aluminum hydroxide roasting and product packaging and storage
Terminology of this standard
List of cited standards
