制钒废水中钒铬渣制备碱式硫酸铬的工艺研究

Study on technology of producing basic chromium sulfate by vanadium-chromium slag recycled from wastewater of vanadium production

以钒制品厂含钒废水中回收的含钒铬废渣为原料,以HG/T 2678—2007工业碱式硫酸铬为检测标准,研究制备碱式硫酸铬的工艺。该工艺是将提钒后的铬渣进行浓酸熟化、浸取废渣中的铬后,再将浸取液除铁和纯化,制备达到纯度要求的氢氧化铬,最后按产品要求,与一定比例硫酸反应制成碱式硫酸铬。该工艺铬回收率达到89.61%,产品符合HG/T 2678—2007的要求,其中三氧化二铬质量分数可以达到31%。

Taking the Industrial Basic Chromium Sulfate Standard HG/T 2678--2007 as the testing standard, a process ofproducing basic chromium sulfate from vanadium-chromium slag that was recycled from the wastewater of producing vanadium was researched.At first ,the curing of chromium slag ,from which the vanadium had been extracted ,was made by concentrated acid to extract chromium from the slag.And then ,the iron in leaching solution was removed for producing the chromium hydroxide meeting the purity requirements.At last, according to product requirements a certain amount of sulfuric acid was added in the purified liquid to produce the basic chromium sulfate.In the process the recovery rate of chromium was 89.61%, the products met the standard HG/T 2678--2007 and the mass fraction of Cr203 in the product could reach 31%.