Patent ID: 11964902
Assignee: BEIJING UNIVERSITY OF TECHNOLOGY
Field: Other special machines (Mechanical engineering)
Classification: CPC C | IPC C

Claim 2:
3. The method for preparing lead smelting slag glass-ceramics based on the oxidation of silicon-rich silicon smelting slag and composition adjustment according to claim 1, comprising the following steps:
(1) prepare the oxidation tempering material in advance; weigh silicon slag, oxidant, flux and clarifier according to the formula amount to form an oxidation tempering batch; the oxidation tempering batch is melted to form an oxidation tempering material melt;
(2) prepare lead slag glass-ceramics; mix the oxidation tempering material melt formed in step (1) with hot lead slag and clarify it to form a basic glass liquid; the basic glass liquid is quenched with water, crushed, after formation and crystallization, crystallized glass is formed; the melting temperature is 1450-1500° C. and kept for 2-3 hours to obtain the oxidation tempering material melt;
conditions for mixing the oxidation tempering material melt and the hot lead slag are: mixing at 1500-1550° C. for 1-2.5 hours to form a glass liquid with uniform composition; transfer or pour the high-temperature glass liquid into pre-prepared water below 25° C., and the glass liquid instantly turns into glass particles; filter the glass particles out of the water and dry them at 120-170° C.;
crush the water-quenched basic glass frit in a crusher for 25-40 minutes, and then pass it through a 200-mesh sieve to obtain basic glass powder;, put the above basic glass powder into the mold, hold it under a pressure of 15-25 MPa for 15-25s and obtain a shaping body;
put the formed green body into the crystallization furnace and heat it up to 500-750° C. at a heating rate of 5-15° C./min for preheating for 2-5 hours, and then heat it up to 950-1100° C. at a heating rate of 3-8° C./min; Carry out heat preservation and sintering for 2-3 hours; lower the temperature to 830-960° C. at a cooling rate of 5-10° C./min, keep it for 1-2 hours and then naturally cool to room temperature to obtain glass-ceramics product.