Process for combined production of alumina as well as active calcium silicate and cement from gangue
A technology of activated calcium silicate and coal gangue, which is applied in the production of alumina/hydroxide, silicate, cement, etc., can solve the problems of high limestone temperature, waste of resources, and high energy consumption, and achieve high whiteness, The effect of saving production costs and improving economic benefits
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[0035] Referring to accompanying drawing, production step of the present invention is:
[0036] ①The selection of raw materials contains AI 2 o 3 42.93% / SiO2 2 51.92% coal gangue, after being ground to 200 meshes, is activated by high-temperature roasting, the roasting temperature is 650°C, and the holding time is 2 hours.
[0037] ②After the roasted clinker is naturally cooled, add 15% sodium hydroxide solution according to the mass ratio of coal gangue to NaOH of 1:1.5, and carry out desiliconization reaction at 110°C. The reaction time is 2h. After the reaction is finished, filter and separate to obtain the filtrate sodium silicate solution and filter cake desiliconized coal gangue.
[0038] ③ Add lime milk to the filtrate sodium silicate solution for causticization reaction, the amount of lime milk added is based on CaO and SiO 2 The molar ratio is 1.1, the reaction temperature is 90° C., and the reaction is separated by filtration after 1 h. The filtrate is sodium ...
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