Method for extracting vanadium by stone coal and sulfuric acid wet pile oxidation conversion at normal temperature and pressure

Abstract

The invention provides a method of leaching vanadium by adding sulfuric acid to stone coal, wet-stacking, oxidizing and converting under the normal temperature and pressure. The method comprses the following steps: (1) dry-grinding bone coal into bone coal powder with a diameter of 1-5mm; (2) adding sulfuric acid and water with a mass ratio of bone coal powder :sulfuric acid :water of 100:10-25:5-12, stirring uniformly, wet-stacking under the normal temperature and pressure for 3-15 days with a stacking height equal to or larger than 2m, and the sulfuric acid is industrial sulfuric acid; (3) adding water according to a solid-liquid weight ratio of 1:0.7-1.5 under the normal temperature and pressure, stirring and leaching for 30-120 minutes, adjusting the PH value to 2-3, and filtering thefinal solution for deslagging to obtain a blue vanadic sulfate solution.The invention has characteristics of small investment, low energy-consumption, high coefficient of metal recovery, low producing cost and small environmental pollution.

Description

technical field [0001] The invention relates to a method for extracting vanadium, in particular to a method for oxidizing, transforming and leaching vanadium by adding sulfuric acid to wet pile of stone coal at normal temperature and pressure. Background technique [0002] Vanadium and its compounds are widely used in metallurgy, aerospace, chemical and other industrial sectors. Vanadium can improve the strength, toughness, ductility and heat resistance of steel. Metal vanadium can also be used in magnetic materials, cast iron, hard alloys, superconducting materials and In nuclear reactor materials and other fields, vanadium pentoxide and other vanadium compounds are mainly used as colorants in the glass and ceramic industries, sulfuric acid and catalysts for petrochemical production. Vanadium catalysts have special activity and cannot be replaced by other elements. With the rapid development of metallurgy and chemical industry, the application range of vanadium is getting w...

AI Technical Summary

Problems solved by technology

For example, Chinese Patent No. 200610011042.0 discloses a method for oxidizing, transforming and leaching vanadium from stone coal under a pressure field: adding stone coal, oxidant and 50-98% industrial sulfuric acid into the autoclave, and controlling the conversion temperature to 100-300 *C, under the condition of pressure 1.0MPa, acid leaching for 10 minutes to 240 minutes can directly transform the vanadium in the stone coal into the solution. Although the leaching index of vanadium can be as high as 95%, the equipment requirements are high, the investment is large, and the energy consumption is high.

Chinese patent No. 90104669.8 discloses a method for extracting vanadium pentoxide by sulfuric acid heating and slaking of stone coal ash slag. The vanadium leaching rate is 68%. out, serious environmental pollution, and low leaching rate and other disadvantages

[0009] Moreover, the existing acid leaching process is all to adjust the pH value after stirring leaching and filtering, and the loss of vanadium in the filtering step is 5-10%, which is relatively large.