Method for extracting aluminum oxide from coal gangue and co-producing active calcium silicate
A technology of active calcium silicate and coal gangue, which is applied in the directions of alumina/aluminum hydroxide, silicate, alkaline earth metal silicate, etc., can solve the problems of waste of resources, poor economy, cumbersome process, etc., and save production costs. , reduce energy consumption and improve economic efficiency
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[0036] Referring to accompanying drawing, production step of the present invention is:
[0037] ① Raw material selection containing Al 2 o 3 42.93%, SiO 2 51.92% coal gangue, after being ground to 200 meshes, is activated by high-temperature roasting at a roasting temperature of 950°C and a holding time of 2 hours.
[0038] ② After the roasted clinker is naturally cooled, add 15% sodium hydroxide solution according to the mass ratio of coal gangue to NaOH of 1:0.5, and carry out desiliconization reaction at 110°C for 2 hours. After the reaction is finished, filter and separate to obtain the filtrate sodium silicate solution and filter cake desiliconized coal gangue.
[0039] 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, and the reaction temperature is 90°C. After reacting for 1 hour, filter and separate. The filtrate is sodium hydroxide solution, which is...
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