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Bayer role of high pressure digestion adding lime


Is a typical sign of a diaspore, long-term production proven, high pressure leaching process is a good selection of lime additive, and can obtain satisfactory dissolution results. Through experimental research, proved the above assertion is correct. Bayer added a lime diaspore, you can speed up a dissolution of diaspore, but the amount of lime added is too low or too high, can not improve the dissolution rate of alumina. When the optimum amount of lime added,[link widoczny dla zalogowanych], they can get better dissolution results. 1. Adding lime can enhance a dissolution of diaspore performance. High pressure digestion of a diaspore, adding lime can promote the dissolution of aluminum items side, the destruction of their lattice energy, thereby enhancing the dissolution properties of aluminum. Generally considered to be the main mechanism of adsorption with AIO. Lime mineral surface activation results. 2. TiO adding lime to eliminate harmful impurities and improve the dissolution rate of alumina. In a high pressure digestion process of diaspore TiO due to the formation of titanium impurities in sodium (NaO �� 3TIO2-2.5HO) hard films, seriously hampering the further dissolution of aluminum leaching. After adding lime to produce hydroxyl titanate CaTiO (OH) and garnet or titanium with titanium calcium hydrate. Such compounds crisp porous, easy to peel off, so that a solution of OH and AI (OH) free penetrate easily, and the mixing of this compound in the dissolution, easily detached from the mineral surface, and thus greatly reduce the diffusion resistance, contact surface increases, the leaching rate of 54 provincial 2004.5 �� Chen Huijie greatly improved. 3. Add lime hydrate formation process of the enhanced dissolution of garnet to play the role. Bayer high pressure digestion temperatures, 3CaO �� AIO3 More than sodium silicate mineral particles from the surface from, accelerate the speed of the process of reaction, which play a role in strengthening the process of dissolution. 4. Adding lime can reduce the alkali consumption. Alumina production in the alkali consumption is an important technical and economic indicators, in the dissolution process, generated by adding lime to replace the titanium titanium sodium calcium, sodium silicate is calcium silicate instead. Tests show that adding lime leaching process, the producer of sodium, calcium,[link widoczny dla zalogowanych], nepheline and other silicon compounds. With the dissolution temperature increases,[link widoczny dla zalogowanych], the activity of calcium in the high temperature increases,[link widoczny dla zalogowanych], the ability to enhance the exchange of sodium ions, the final phase of red mud has changed the composition of sodium silicate, to reduce the role of alkali consumption. 5. Adding lime can play a role in phosphorus removal of silicon. Sodium aluminate solution under the AIO. And the relationship between the equilibrium concentrations of SiO, at high pressure leaching process of adding lime can play a role in the further de-Si; PO and lye in the dissolution process can generate a good solubility of Na. PO4o dissolution of bauxite, the PO contained about 1/3-2/3 into the solution, generating sodium phosphate in solution. When the temperature decreases slightly when they crystallization, thus affecting the product quality, and plug the pipe. When to add lime dissolution, would allow the PO to become insoluble calcium phosphate into the red mud. 6. Adding lime can get a favorable phase of red mud. Experimental study, dissolution of diaspore bauxite, red mud of its phase transformation as follows: a calcium sodalite nepheline one (Na-Ca nepheline) a hydration of garnet, a hydroxyl containing calcium titanate hydrated titanium garnet. Red mud phase transition occurs, the trend is the increase of temperature, sodium aluminate solution and dissolution in the course of the concentration of SiO adding lime increases the amount of the. When appropriate, add lime, sodium silicate, and continue to be calcium silicate hydrate instead of garnet,[link widoczny dla zalogowanych], alkali consumption was significantly reduced at this time. Appropriate amount of lime added, and the garnet red mud in the formation of hydration not too much, because it is caused by dissolution process AIO. The main reason for the loss. High pressure digestion diasporic bauxite, the role of adding lime is very significant, the appropriate amount of lime added, not only can reduce the alkali consumption, but also improve the dissolution rate of alumina. Tests showed that a high pressure digestion testing diaspore, 9% addition level appropriate lime, alumina dissolution rate can reach 87.86%. I (The unit of aluminum in Guizhou points - 'Z-aS) (column Editor: Fang Yunguo)

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