钨冶炼渣制备高强烧结陶粒及其性能研究

doi:10.19964/j.issn.1006-4990.2022-0624

Abstract

Abstract:

Based on the status that tungsten smelting waste slag was difficult to treat，a harmless utilization approach for preparing high-strength ceramsite was proposed.The high strength ceramsite with excellent properties was prepared by high temperature sintering method，using tungsten slag as the main raw material，adding clay as the plasticizer and sintering aid.The effects of raw material ratio，preheating conditions and sintering conditions on ceramsite performance were systematically studied，and the effect of phase changes during the sintering process on the properties of ceramic particles was explored.Under the optimum conditions：m（tungsten）∶m（clay）of 6∶4，preheating temperature of 400 ℃，preheating time of 20 min，sintering temperature of 1 150 ℃ and sintering time of 30 min，the compressive strength of single particle of obtained ceramsite was 15.64 MPa，the cylinder pressure strength was 18.37 MPa，the apparent density was 1 713 kg/m³，the bulk density was 892 kg/m³ and the water absorption in 1 h was 8.79%.The leaching toxicity of common heavy metals met the requirements of GB 5085.3—2007 “Identification standard for hazardous waste-Identification for extraction toxicity”，which could be used as high-strength building aggregates.

Key words: solid waste, tungsten smelting slag, comprehensive utilization, high-strength ceramsite

CLC Number:

TQ174

LIU Guanfa, ZENG Chaocong, WANG Zekai, ZENG Xiangrong, HUANG Wanfu. Study on preparation of high strength sintered ceramsite from tungsten smelting slag and its property[J]. Inorganic Chemicals Industry, 2023, 55(8): 132-139.

Figures/Tables 14

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试样	w（Al₂O₃）	w（SiO₂）	w（Fe₂O₃）	w（CaO）	w（MgO）	w（Na₂O）	w（K₂O）	w（Mn）	w（W）
钨渣	2.65	8.39	8.71	6.54	0.19	0.08	0.12	6.28	0.63
黏土	22.81	67.33	0.28	0.20	0.41	0.27	2.73	0.13	—
试样	w（Sn）	w（Ti）	w（S）	w（Cu）	w（Pb）	w（Zn）	w（Ni）	w（Cr）	w（As）
钨渣	0.68	0.19	0.27	0.313	0.417	0.189	0.034	0.027	0.201
黏土	—	0.21	0.18	0.15	0.08	0.07	0.01	—	—

原料	w（钨渣）/%	w（黏土）/%	配比	w（钨渣）/%	w（黏土）/%
T1	40	60	T4	70	30
T2	50	50	T5	80	20
T3	60	40

项目	ρ（Cu）	ρ（Pb）	ρ（Zn）	ρ（Ni）	ρ（Cr）	ρ（As）
钨渣陶粒	0.187	0.006	0.175	0.230	0.421	0.056
GB/T 17431.2—2010限定值	≤100	≤5	≤100	≤5	≤15	≤5

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Study on preparation of high strength sintered ceramsite from tungsten smelting slag and its property

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