GB/T 50530-2022 PDF English
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| GB/T 50530-2022 | English | RFQ | ASK | 3 days [Need to translate] | Code for design of alumina refinery process |
| GB 50530-2010 | English | RFQ | ASK | 3 days [Need to translate] | Code for design of alumina refinery process |
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Basic data
| Standard ID | GB/T 50530-2022 (GB/T50530-2022) |
| Description (Translated English) | Code for design of alumina refinery process |
| Sector / Industry | National Standard (Recommended) |
| Classification of Chinese Standard | P34 |
| Classification of International Standard | 91.040.20 |
| Word Count Estimation | 150,146 |
| Date of Issue | 2022-07-15 |
| Date of Implementation | 2023-02-01 |
| Issuing agency(ies) | Ministry of Housing and Urban-Rural Development of the People's Republic of China; State Administration for Market Regulation |
GB/T 50530-2022: Code for design of alumina refinery process
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1 General 1.0.1 This standard is formulated to unify the technical requirements for process design of alumina plants, promote technological progress, improve design quality, and achieve advanced technology, reasonable economy, safety and reliability. 1.0.2 This standard applies to the process design of new, expanded and reconstructed alumina plants that use diaspore type, gibbsite type and mixed type bauxite as raw materials to produce metallurgical grade alumina. 1.0.2 This standard applies to the process design of new, expanded and reconstructed alumina plants that use diaspore type, gibbsite type and mixed type bauxite as raw materials to produce metallurgical grade alumina. 2 terms 2.0.1 Alumina A stable oxide of aluminum with a variety of different crystal forms, the molecular formula is Al2O3. 2.0.2 Aluminum hydroxide The crystalline substance separated from the sodium aluminate solution has the molecular formula Al(OH)3. 2.0.3 Metallurgical grade alumina smelter grade alumina Alumina used in the production of metallic aluminum by molten salt electrolysis. 2.0.4 Bauxite It is a general term for ores composed of diaspore, gibbsite or boehmite as the main mineral, and composed of silicon, iron and titanium in different amounts and small or trace amounts of other element compounds. 2.0.5 Diaspore diaspore Oxygen-hydroxide of aluminum with a density of 3.3g/cm³-3.5g/cm³ and a Mohs hardness of 6.5-7.It belongs to the orthorhombic system, and its molecular formula is AlOOH or Al2O3·H2O. 2.0.6 Boehmite boehmite Oxygen-hydroxide of aluminum with a density of 3.01g/cm³-3.06g/cm³ and a Mohs hardness of 3.5-4.It belongs to the orthorhombic system, and its molecular formula is AlOOH or Al2O3·H2O. 2.0.7 Gibbsite gibbsite Oxygen-hydroxide of aluminum with a density of 2.35g/cm³-2.42g/cm³ and a Mohs hardness of 2.5-3.5, belonging to the monoclinic crystal system, with a molecular formula of Al(OH)3 or Al2O3·3H2O. 2.0.8 mixed bauxite A gibbsite ore containing part of boehmite, or a diaspore mine containing part of boehmite. 2.0.9 Red mud red mud The residue after extracting alumina by Bayer method or sintering method. 2.0.10 Bayer process A production method in which the alumina in the bauxite is directly leached with caustic lye to obtain a sodium aluminate solution, and then diluted and decomposed to produce alumina. 2.0.11 sintering process The aluminum-containing raw material is calcined by batching, so that the alumina in it is converted into soluble sodium aluminate. 2.0.13 serial combination process The red mud processed by the Bayer method of bauxite is then processed by the sintering method to recover the alumina and alkali in the alumina production method. 2.0.14 parallel combination process High-grade bauxite is processed by Bayer method, low-grade bauxite is processed by sintering method, and the sodium aluminate solution produced by sintering method is used to supplement the alumina production method lost by Bayer method. 2.0.15 mixed combination process The red mud processed by the Bayer method is mixed with an appropriate amount of bauxite, and then processed by the sintering method for the production of alumina. 2.0.16 Circulating lye test liquor Lye for return batching in alumina production. 2.0.17 bauxite slurry Slurry for Bayer dissolution prepared according to production process requirements. 2.0.18 Raw slurry The slurry used for firing clinker prepared according to the requirements of the production process. 2.0.19 alkali red mud alkali red mud In the combined production, the Bayer process red mud slurry after adding alkali powder. 2.0.20 Dissolution digestion The process of leaching alumina from bauxite with caustic lye at the dissolution temperature. 2.0.21 effective alumina total available alumina Alumina that can dissolve from bauxite into solution under defined dissolution conditions. 2.0.22 reactive silica Under determined stripping conditions, silica in bauxite reacts with alkali resulting in loss of alumina and sodium oxide. 2.0.23 Single-stream dissolution single-stream digestion Dissolution technology in which circulating lye and raw ore pulp are heated together. 2.0.25 pre-desilication Before the raw ore pulp enters the dissolution heating device, the process of making activated silica react with alkali to convert it into hydrated sodium aluminosilicate or hydrated garnet. 2.0.26 Caustic ratio molar ratio Molar ratio of caustic soda to alumina in sodium aluminate solution. 2.0.27 Clinker firing sintering The process in which raw slurry is calcined at high temperature to become aluminate clinker. 2.0.28 clinker dissolution sinter leaching The process of dissolving useful components in clinker with water or dilute alkali solution. 2.0.29 Pregnant liquor Dissolving the sodium aluminate solution after separating the red mud from the slurry. 2.0.30 Crude liquid desilication desilication It is a desiliconization process that converts the silicon oxide in the crude liquid into compounds with low solubility and precipitates as solid precipitates. 2.0.31 sodium aluminate solution The alumina hydrate in bauxite is under the action of caustic lye, and the solid-phase sodium aluminate in clinker is under the action of water or dilute lye to form a solution containing sodium ions and aluminate ions. 2.0.32 control filtration control filtration Before the seeds are decomposed, the filtration process is used to purify the suspended solids in the sodium aluminate solution. 2.0.33 semen green liquor Refined sodium aluminate solution that controls the content of suspended solids after filtration and meets the technical requirements for decomposition. 2.0.34 Seed precipitation The process of adding seeds to sodium aluminate solution, lowering the temperature, and precipitating aluminum hydroxide. 2.0.35 Carbonation precipitation The process of passing carbon dioxide gas into the sodium aluminate solution to neutralize the caustic alkali in the solution and precipitate aluminum hydroxide. 2.0.36 A decomposition of one-stage precipitation Adding seed crystals, the seed decomposition process is dominated by seed crystal growth. 2.0.37 Two-stage decomposition two-stage precipitation Adding fine crystal seeds and coarse crystal seeds respectively, the seed decomposition process is dominated by the agglomeration of fine crystal seeds and the growth of coarse crystal seeds. 2.0.38 Mother liquor spent liquor Sodium aluminate solution after decomposing aluminum hydroxide through seed decomposition or carbonation decomposition. 2.0.39 spent liquor evaporation The process of heating the mother liquor to the boiling point to evaporate the water in it. 2.0.40 Evaporated mother liquor strong liquor Mother liquor concentrated by evaporation. 2.0.41 Alkaline deployment test liquor preparation According to the requirements of circulating lye to caustic alkali concentration and molecular ratio, the process of mixing and preparing alkali solutions with different concentrations. 2.0.42 caustic cleaning The process of using heated caustic lye to clean the scars formed on the surface of equipment, pipes, filter cloths, etc. 2.0.43 hot water washing The process of using hot water to clean the alkali, organic matter or salt attached to the surface of equipment, pipes, filter cloth, etc. 2.0.44 chemical cleaning chemical cleaning The process of using dilute sulfuric acid or dilute nitric acid to clean the scars formed on the surface of equipment, pipelines, etc. 2.0.45 mechanical cleaning The process of using a high-pressure water pump to clean the scars formed on the surface of equipment, pipes, etc. 2.0.46 Aluminum hydroxide calcination The process of drying, dehydrating and converting aluminum hydroxide into different crystal forms of aluminum oxide by heating.
