本文選題：鈣法釩渣　切入點：濕法釩渣　出處：《貴州大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：目前我國生產(chǎn)釩制品的主要原料有石煤釩礦、釩渣(釩鈦磁鐵礦爐渣)和含釩固廢,而從石煤中提取V2O5已成為我國工業(yè)提釩的主要方式之一。貴州省內(nèi)釩礦企業(yè)目前采用的工藝主要有鈣法焙燒提釩工藝、濕法酸浸提釩工藝。在現(xiàn)有技術(shù)條件下,每生產(chǎn)1tV2O5約產(chǎn)生200t釩渣,而傳統(tǒng)的釩渣處置主要為建立尾礦庫堆存,這不僅大量占用土地,還將對環(huán)境造成二次污染。因此,如何將釩渣資源化再利用就顯得十分必要。本文主要目的是探索多途徑的釩渣資源化利用方式,利用鈣法焙燒提釩廢渣為主要原料,輔以膨脹珍珠巖、硅酸鈉(水玻璃)、硼砂制備輕質(zhì)保溫墻體材料及利用鈣法釩渣作水泥混合材研究;同時,對濕法酸浸釩渣作水泥混合材進(jìn)行探討,探索多途徑釩渣的資源化利用,以減少釩渣引起的環(huán)境污染。實驗結(jié)果表明:1)鈣法釩渣具有高硅、高鋁、低鈣的特點,SiO2和Al2O3占到了85%以上,屬于高硅鋁礦渣,可作為原料制備輕質(zhì)墻體保溫材料。2)經(jīng)單因素試驗和正交試驗,確定了利用鈣法釩渣制備輕質(zhì)墻體材料的較優(yōu)工藝條件為A2B1C2D3,在該條件下燒制的試件抗壓強(qiáng)度6MPa,體積密度0.9g/cm3,導(dǎo)熱系數(shù)0.25W/(m·K),吸水率16%。滿足輕質(zhì)墻體保溫材料性能的要求。3)墻體保溫材料試件經(jīng)XRD和SEM微觀分析可知,試件的礦物組成主要為鈣長石、莫來石,試件斷面上有大量的氣孔存在,并且這些氣孔孔徑大小不一,還可看出斷面上有晶體相的物質(zhì)生成。4)利用鈣法釩渣及濕法釩渣作水泥混合材試驗結(jié)果表明,濕法釩渣摻量為25%時,水泥混合材試件抗折、抗壓強(qiáng)度滿足GB175-2007《通用硅酸鹽水泥》P·C32.5的要求;摻量≤15%時,抗折、抗壓強(qiáng)度滿足P·C32.5R的要求;鈣法釩渣摻量為35%時,水泥混合材試件抗折、抗壓強(qiáng)度也滿足P·C32.5的要求;10%≤摻量≤30%時,抗折、抗壓強(qiáng)度滿足P·C32.5R的要求;釩渣摻量≤10%時,抗折、抗壓強(qiáng)度滿足P·C52.5的要求。5)水泥混合材試件物相分析和微觀結(jié)構(gòu)可知,試件的水化產(chǎn)物主要是水化鋁酸鈣、水化硅酸鈣和鈣礬石,同時還有針狀和棒狀水化產(chǎn)物C-S-H凝膠粒子,這些物質(zhì)使得試樣呈現(xiàn)較好的抗折、抗壓特性,說明鈣法釩渣及濕法釩渣都可以作為水泥混合材。
[Abstract]:At present, the main raw materials for producing vanadium products in China are stone coal vanadium ore, vanadium slag (vanadium titanomagnetite slag) and vanadium solid waste. The extraction of V _ 2O _ 5 from stone coal has become one of the main methods for industrial vanadium extraction in China. At present, the main processes used by the vanadium mine enterprises in Guizhou province include calcium roasting process, wet acid extraction process and vanadium extraction process. About 200 tons of vanadium slag is produced for every 1 t V _ 2O _ 5 production, and the traditional disposal of vanadium slag is mainly to build up a tailings reservoir, which not only occupies a large amount of land, but also causes secondary pollution to the environment. How to reuse vanadium slag is very necessary. The main purpose of this paper is to explore the multi-way utilization of vanadium slag, to use calcium roasting of vanadium residue as the main raw material, and to use expanded perlite as the main raw material. Sodium silicate (sodium silicate, borax) was used to prepare light weight insulating wall material and to use calcium vanadium slag as cement mixture, meanwhile, the wet acid leaching vanadium slag as cement mixture was discussed to explore the resource utilization of multi-way vanadium slag. In order to reduce the environmental pollution caused by vanadium slag, the experimental results show that the vanadium slag has the characteristics of high silicon, high aluminum and low calcium, which accounts for more than 85% Sio 2 and Al2O3, and belongs to high silicon aluminum slag. It can be used as raw material to prepare light wall insulation material. 2) by single factor test and orthogonal test, The optimum process conditions for the preparation of lightweight wall materials by calcium vanadium slag were determined as follows: A2B 1C2D3. Under this condition, the compressive strength, volume density, thermal conductivity and water absorption of the specimens sintered at 6MPa, 0.9g / cm ~ 3, 0.25W / m 路K ~ (-1) and 16W / m ~ (-1), respectively, were determined to meet the requirements of heat preservation material properties of light wall. (3) XRD and SEM microanalysis show that the wall insulation material specimen, The mineral composition of the specimen is mainly calcium feldspar and mullite. It can also be seen that the formation of material with crystal phase on the cross section. 4) the test results using calcium vanadium slag and wet process vanadium slag as cement mixture show that when the content of wet process vanadium slag is 25, the specimens of cement mixture can resist bending. The compressive strength meets the requirements of GB175-2007 < universal Portland cement > P 路C32.5; when the content is 鈮，

本文編號：1628256