Lime milk neutralization method acid dipping-extraction vanadium extraction technology

Abstract

The invention relates to a technology for extracting vanadium pentoxide from stone coal vanadium ore, comprising a lime milk neutralization method acid dipping-extraction vanadium extraction technology adopting a thickener production line and a lime milk neutralization method acid dipping-extraction vanadium extraction technology adopting a belt filter production line. The first technology adoptsthe working procedures of raw material pulverization, ball milling, sulfuric acid leaching, five-stage thickening washing separation, overflowing lime milk neutralization, single-stage thickening solid-liquid separation, overflowing reduction, pH value adjustment, extraction, reverse extraction, vanadium-contained solution oxidation, ammonia water precipitation, pyrogenation, and the like to obtain the vanadium pentoxide finished products, and the second technology adopts the working procedures of raw material pulverization, ball milling, sulfuric acid leaching, ore pulp lime milk neutralization, filtration washing, filtrate clarification washing, pH value adjustment, extraction, reverse extraction, vanadium-contained solution oxidation, ammonia water precipitation, pyrogenation, and the like to obtain the vanadium pentoxide finished products. The invention solves the problems of above-norm tailing wastewater NH3-N existing in the prior acid dipping-extraction vanadium extraction and has the advantages of high vanadium recovery rate, low production cost, good economic benefits and environment-friendly effect, and the like.

Description

Vanadium Extraction Process by Lime Milk Neutralization Method and Acid Leaching Extraction technical field The invention belongs to the technical field of preparation of metal substances, and relates to a process for extracting vanadium pentoxide (V2O5) from vanadium-containing stone coal mines. Background technique Vanadium is one of the rare metals with high melting point that is widely used in industry, and has many excellent properties. Most of the traditional techniques for extracting vanadium pentoxide from vanadium-containing stone coal mines use sodium roasting, which has high labor intensity, high energy consumption, low vanadium yield and serious waste gas pollution. In view of the problems referred to above, some enterprises in this field adopt acid leaching-extraction process to extract vanadium pentoxide from stone coal mine at present, and its main technological process is as follows: raw ore-crushing-screening-ball milling-sulfuric acid leaching-through fiv...

AI Technical Summary

Problems solved by technology

Although this process solves the problems of high energy consumption, low vanadium recovery rate and waste gas pollution in the sodium roasting process, but because it has no treatment plan for NH3-N and SO4, especially in this process, a large amount of sulfuric acid is used for leaching. Then use ammonia water to neutralize and then use ammonia water to precipitate vanadium. A dressing and smelting plant with three production lines that process 900 tons of ore per day consumes more than 380 tons of liquid ammonia per month, resulting in the NH3-N content in the tail water exceeding the standard. The problem of environmental pollution remains. not effectively resolved