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Method for curing and leaching reinforced stone coal navajoite concentrated acid

A technology for strengthening stone and coal vanadium ore, applied in the fields of hydrometallurgy and leaching, can solve the problems of limited application range, high roasting temperature, difficult curing operation, etc. significant effect

Active Publication Date: 2013-09-11
CHANGSHA RES INST OF MINING & METALLURGY
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Problems solved by technology

CN1049642A Chinese patent document discloses a kind of " process flow of extracting vanadium pentoxide by lime ash slag sulfuric acid mixed with acid heating slaking water leaching ", wherein the slag of stone coal fluidized furnace is matured and leached. It has the role of roasting pretreatment, and has a high requirement for the C content in stone coal raw materials, and the scope of application is not wide
No. CN101260464A Chinese patent literature discloses "a kind of method for decomposing vanadium ore from stone coal", and non-patent literature also discloses "low-temperature sulfate roasting mineral decomposition process for extracting vanadium from stone coal" (Liu Wanli, "Journal of Nonferrous Metals of China" 2009 Year 05, P943~P948), these two literatures have carried out the aging and leaching of raw stone coal ore, but there are also shortcomings such as high roasting temperature and high water immersion temperature.
Both CN101921912A Chinese patent literature and "Ore Leaching Technology" (P536) have proposed a two-stage aging leaching method for stone coal vanadium ore to enhance acid diffusion, but it adds a stage of aging, making the aging process longer, and in the acid mixing process A large amount of heat is released in the medium, and the diffusion process of the acid has been completed enough, so its strengthening effect is not obvious
CN102191388A Chinese patent document proposes a method of two-stage slaking enhanced leaching in "Concentrated Acid Two-stage Slaking Fossil Coal Vanadium Extraction Process", which requires a liquid-solid ratio of at least 0.5, and the slaking operation is difficult to carry out, and two kinds of additives need to be added , increasing the burden of waste treatment
[0005] The concentrated acid aging leaching method of stone coal vanadium ore has the advantages of simple process flow, short operation cycle, and environmental protection. It has been paid more and more attention in the field of vanadium extraction from stone coal, but there are also shortcomings such as high acid consumption and low vanadium leaching rate. Urgent improvement

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  • Method for curing and leaching reinforced stone coal navajoite concentrated acid

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Embodiment 1

[0029] Stone coal vanadium mine in a certain place, the main chemical composition of the raw ore is C 13.20%, SiO 2 66.76%, Al 2 o 3 6.70%, V 2 o 5 0.92%, using as figure 1 Shown method of the present invention handles stone coal vanadium ore, specifically comprises the following steps:

[0030] First crush and finely grind the stone coal vanadium ore until the particle size is below 0.25mm, and the mineral content below 0.15mm accounts for 81%, add 10% of the stone coal vanadium ore quality water and mix well, then add a certain amount of concentrated sulfuric acid and mix well, The initial concentration of sulfuric acid solution in mineral powder is 66% (the change of the amount of concentrated sulfuric acid is shown in Table 1 below), and then the mixture is aged at 120°C for a period of time (the change of curing time is shown in Table 2 below), During the curing process, the pressure in the container is 1.2×10 5 ~1.3×10 5Pa, relative humidity of 60% to 65%, and ...

Embodiment 2

[0037] Stone coal vanadium mine in a certain place, the chemical composition of the raw ore mainly includes C 15.00%, SiO 2 58.46%, Al 2 o 3 8.72%, V 2 o 5 1.00%, using as figure 1 The shown method of the present invention processes this stone coal vanadium ore, specifically comprising the following steps:

[0038] First crush and finely grind the stone coal vanadium ore to less than 0.15mm, add water with 10% mass of stone coal vanadium ore and mix well, then add a certain amount of concentrated sulfuric acid and mix well (the amount of concentrated sulfuric acid changes as shown in Table 3 below), Then the mixture is aged at 140°C for 7 hours, and the pressure in the container is 1.2×10 during the aging process. 5 ~1.3×10 5 Pa, relative humidity of 60% to 63%, and no ventilation, the evaporation of water is 55% to 56% of the added amount. The obtained clinker was leached in water with a liquid-solid ratio of 2:1 for 2 h. After liquid-solid separation, the concentr...

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Abstract

The invention discloses a method for curing and leaching reinforced stone coal navajoite concentrated acid. The method comprises the following steps of: crushing and grinding the stone coal navajoite; adding water and concentrated acid to the obtained mineral powder for uniformly stirring; curing the mixture at a high temperature, and controlling the moisture evaporation amount to be 30%-90% of the adding amount of the moisture during the high-temperature curing process; and leaching the obtained clinker under the normal temperature and the normal pressure, and obtaining a vanadium-containing leaching solution and leaching residue after the liquid-solid separation. The method for curing and leaching reinforced stone coal navajoite concentrated acid has the advantages of being simple in process flow, energy-saving and consumption-reducing, convenient to operate, green and environment-friendly, high in vanadium leaching rate, low in acid consumption and the like.

Description

technical field [0001] The invention belongs to the technical field of ore leaching in the field of hydrometallurgy, in particular to a kind of enhanced leaching V from stone coal minerals. 2 o 5 Methods. Background technique [0002] Vanadium is a very important strategic resource. Vanadium is mainly used in the iron and steel industry and the ceramic industry, and has new applications in the aerospace industry, nuclear industry, biopharmaceuticals, and vanadium batteries. Vanadium-containing stone coal is a unique vanadium resource in my country, and its reserves are huge. The process of extracting vanadium from it is basically sodium salt roasting-solvent extraction-ammonium salt precipitation. The yield of this process is generally only 45% to 50%, and roasting Process produces HCl and Cl 2 and other harmful gases, the environmental pollution is very serious, and has been banned by the state. [0003] For this reason, metallurgists have proposed a variety of roasting...

Claims

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Application Information

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IPC IPC(8): C22B3/08C22B34/22
CPCY02P10/20
Inventor 万洪强宁顺明佘宗华邢学永王文娟吴江华蒙在吉李肇佳陈文勇黄臻高刘建忠封志敏赵强
Owner CHANGSHA RES INST OF MINING & METALLURGY
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