New technology using potash feldspar ore for production of potash, sodium carbonate and alumina

The invention discloses a new technology using potash feldspar ore for production of potash, sodium carbonate and alumina, and a method comprising pre-desiliconization, soda-lime sintering dissolution, aluminum extraction by carbon and evaporation crystallization for separation of potassium and sodium is used for comprehensive recovery of aluminum, potassium and sodium resources. The new technology has the following advantages: the technical scheme of the new technology is reasonable, and active calcium silicate, white carbon black, sodium carbonate potassium carbonate and alumina can be produced. In carbonation decomposition process of the new technology, CO2 gas produced by sintering is used, the raw material cost is very low, and the greenhouse gas emissions can be reduced. During the sintering, the amount of a pre-desiliconization raw material is reduced by about 35%, the amount of silicon calcium slag is reduced by about 30%; desilicification slag needs no addition of sodium carbonate for raw material proportioning; washing water for washing active calcium silicate can be used for desiliconization slag washing, the amount of process water and waste water can be reduced, the silica product form can be enriched, the white carbon black and activated calcium silicate with the high added value can be outputted; by causticization regeneration of the sodium carbonate, alkali self-sufficiency and equilibrium cycle of the whole process can be realized.