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Lime milk neutralization method acid dipping-extraction vanadium extraction technology

A lime milk and extraction technology, which is applied in the direction of improving process efficiency and vanadium oxide, can solve the problems of waste gas pollution and low vanadium recovery rate, and achieve the effects of preventing environmental pollution, accelerating extraction speed, and reducing anion concentration

Active Publication Date: 2009-11-18
SHAANXI WUZHOU MINING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 due to its impact on NH 3 -N, SO 4 There is no treatment plan, especially in this process, a large amount of sulfuric acid is used for leaching first, then neutralized with ammonia water, and vanadium is precipitated with ammonia water. A dressing and smelting plant with three production lines processing 900 tons of ore per day consumes more than 380 tons per month Liquid ammonia, resulting in NH in the tail water 3 -N content greatly exceeds the standard, and the problem of environmental pollution has not been effectively solved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The process of extracting vanadium by lime milk neutralization acid leaching extraction using thickener washing production line includes the following process steps: crushing vanadium-containing stone coal and sieving into pieces of ≤20mm, and sending the sieved material into a ball mill to make- For 60 mesh pellets, immerse the pellets in a sulfuric acid solution with a concentration of 50% and an acidity of 1.1-1.4N for 20 hours to obtain the leached pulp. The leached pulp is subjected to five-stage thickening, washing and separation by a thickener, and the separated The underflow slurry with a concentration of 40% is neutralized by lime milk and sent to the tailings pond. The overflow supernatant is neutralized with 12%-15% lime milk to PH=2.2~2.5, and then passed through a single-stage thickener. The neutralized liquid is subjected to single-stage dense solid-liquid separation. After the separated overflow is reduced, the pH is adjusted to pH<2.7 with caustic soda, and ...

Embodiment 2

[0014] The process of extracting vanadium by lime milk neutralization acid leaching extraction using belt filter production line includes the following process steps: crushing vanadium-bearing coal mine and sieving into pieces of ≤20mm, and sending the sieved material to a ball mill for grinding. -60 mesh pellets, immerse the pellets in a sulfuric acid solution with a concentration of 50% and an acidity of 1.1-1.4N for 20 hours to obtain a leaching slurry. The sulfuric acid leaching slurry is neutralized with 12%-15% lime milk To PH=2.2~2.5, filter and wash the neutralized ore pulp through a belt filter. The filtered and washed filter cake is neutralized by lime milk to PH>8 and then sent to the tailings silo. The filtered clarified liquid is reduced and fine-tuned with caustic soda. PH<2.7, use P204 extractant to extract the pH-adjusted liquid. The contact time is 30 minutes to obtain the loaded organic phase. Then, it is back-extracted with 3N sulfuric acid solution to obtain a ...

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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 adopts the 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

Technical field [0001] The invention belongs to the technical field of preparation of metal substances, and relates to a method for extracting vanadium pentoxide (V 2 O 5 ) Process. Background technique [0002] Vanadium is one of the rare metals with high melting point that is widely used in industry and has many excellent properties. Traditional processes for extracting vanadium pentoxide from vanadium-bearing coal mines mostly use sodium roasting, which has high labor intensity, high energy consumption, low vanadium yield, and serious waste gas pollution. In response to the above problems, some companies in this field currently use acid leaching-extraction technology to extract vanadium pentoxide from stone coal mines. The main process flow is as follows: raw ore-crushing-screening-ball milling-sulfuric acid leaching-through five-stage thick washing ( Production line) or belt filter (production line) for solid-liquid separation-the separated dense underflow or filter cake is n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B34/22C22B3/08C22B3/26C01G31/02
CPCY02P10/20
Inventor 谷利君戴子林张世贵尤卫政许世恭郝方彬
Owner SHAANXI WUZHOU MINING
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