Production process for extracting elements such as aluminum, vanadium, molybdenum and nickel from black shale

Abstract

The invention discloses a production process for extracting elements such as aluminum, vanadium, molybdenum and nickel from black shale. The production process comprises the following steps: carrying out crushing and fine grinding on ores, adding an additive, water and concentrated sulfuric acid, uniformly stirring and then, sealing for storage and curing; stirring and leaching cured materials in water to obtain a solution of aluminum sulfate, nickel sulfate, molybdenum acyl sulfate and vanadium acyl sulfate, and carrying out liquid-solid separation; adding an ammonium salt or a potassium salt into filtrate to produce alum crystals, and carrying out filtering separation; regulating the PH value of the filtrate, then carrying out oxidization, then, adsorbing by using anion resin and desorbing by using an lkali liquor; regulating the PH value of the desorbing liquor, adding the ammonium salt to produce vanadate, and carrying out filtering separation; re-regulating the PH value of the filtrate to produce molybdate crystals, and carrying out filtering separation; adsorbing nickel from ion-exchanged liquor by using amino phosphate rein, and generating nickel sulfate by virtue of elution, evaporation and concentration of the sulfuric acid, and carrying out crystallizing separation on the nickel sulfate; and returning the filtrate for use.

Description

technical field [0001] The invention relates to a low-cost extraction scheme for nonferrous metals, in particular to a production process for comprehensively extracting elements such as aluminum, vanadium, molybdenum, and nickel from black shale without discharging "three wastes", and belongs to the technical field of hydrometallurgy and chemical industry. [0002] Background technique [0003] Black shale mainly occurs in ancient strata such as Sinian, Cambrian, and Silurian. Because of its carbon-containing appearance, it is black or black-gray. In some places, it is called stone coal, and most of them have the characteristics of high ash, high sulfur, and high hardness. . Black shale often contains one or several metal elements, which can be independently ore-formed to form vanadium ore, molybdenum ore, nickel ore or uranium ore, etc., or associated with ore-forming to form vanadium-molybdenum ore, molybdenum-nickel ore, molybdenum-nickel ore, etc. Vanadium ore, vanadiu...

AI Technical Summary

Problems solved by technology

[0013] 1. Most of the reaction is carried out in a pressure kettle, which requires pressurized oxygen and heat preservation, high equipment cost, high unit energy consumption, less monomer production materials, and low overall production efficiency;

[0014] 2. The consumption of acid in the whole process is relatively large, and the amount of chemical agent added is large. The latter process requires a large amount of alkali to neutralize, and the cost is high;

[0015] 3. The content of low-grade elements in the ore is too low. For example, some vanadium-molybdenum ores contain 1.5% vanadium, but only 0.1% molybdenum; some molybdenum-nickel ores contain 5% molybdenum, but only 0.15% nickel. Due to the high extraction cost of low-grade elements, most of them are discarded with the slag after extracting the main elements, resulting in a waste of resources;

[0016] 4. It is necessary to add a large amount of additives such as ammonium nitrate and sodium chlorate to strengthen the leaching, so that nitrate and chlorate ions are generated in the leachate. These ions will continue to accumulate in the cycle production, which not only affects the next step of separation and purification, but also makes the Production water is difficult to recycle

The waste water will pollute the environment if it is discharged without purification treatment, and the cost of purification treatment will be very high

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