A kind of leaching method of extracting vanadium from stone coal
A stone coal and leaching technology, which is applied in the direction of improving process efficiency and can solve problems such as low leaching rate, large pollutant discharge, and complex forms of vanadium
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Embodiment 1
[0089] Embodiment 1: a kind of leaching method of extracting vanadium from stone coal, concrete operations are as follows:
[0090] A stone coal vanadium mine in Huaihua, Hunan, the mass percentage of its chemical composition is:
[0091] Table 1 Raw ore multi-element analysis results / %
[0092]
[0093] After the ore is crushed, water is added to grind the ore to obtain a stone coal slurry with a particle size of -74 μm accounting for more than 85% and a liquid-solid ratio of 2.
[0094]Add the above-mentioned stone coal slurry into the leaching tank, at 300r.min -1 Under stirring, add a leaching agent with a mass concentration of 5% HCl evenly, keep the pH value of the pulp in the range of 3.5-4.0, leaching for 3 hours, and settle the leaching slurry for 1 hour, release the upper leachate, and the bottom is a section of concentrate; test this The leaching rate of step vanadium is 1.2%, and the leaching rate of iron is 2.1%.
[0095] Add water to a section of concentrat...
Embodiment 2
[0100] Embodiment 2: a kind of leaching method of extracting vanadium from stone coal, concrete operations are as follows:
[0101] A leaching test was carried out on a high-calcium stone coal-vanadium mine in Tongshan, Hubei. V in this mineral 2 o 5 The content is 0.86%. The gangue minerals are mainly mica, calcite, dolomite and pyrite. The composition is as follows:
[0102] Table 2 Stone coal mine multi-element analysis results / %
[0103]
[0104] S1: After the ore is crushed, water is added to grind the ore to obtain a stone coal slurry with a particle size of -74 μm accounting for 86.5% and a liquid-solid ratio of 3.
[0105] S2: Add the above-mentioned stone coal slurry into the leaching tank, at 200r·min -1 Under stirring, evenly add a leaching agent with a mass concentration of 6.0% HCl, keep the pH value of the ore slurry in the range of 6-6.8, leaching for 4 hours, press filter the leaching slurry, and obtain a section of leaching solution and a section of con...
Embodiment 3
[0112] Compared with Example 2, the only difference is that in S2, the pH value of the slurry is controlled within the range of 2.0-3.0, leached for 4 hours, and the leached slurry is subjected to pressure filtration to obtain a section of immersion solution and a section of concentrate, and detect the vanadium in this step. The leaching rate of iron is 3.1%, the leaching rate of iron is 3.3%, and the leaching rate of calcium is 98.7%.
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