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High-valued treatment method for elements in vanadium precipitation wastewater

A technology for vanadium precipitation wastewater and treatment method, applied in chemical instruments and methods, silicon oxide, inorganic chemistry, etc., to achieve the effect of improving recovery rate, reducing agglomeration and small particle size

Pending Publication Date: 2022-04-15
四川省绵阳市华意达化工有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the above-mentioned existing process for treating vanadium precipitation wastewater needs to be continuously improved and explored.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A method for high-value treatment of elements in vanadium precipitation wastewater, comprising the following steps:

[0041]Add 96.2g of calcium oxide to 8L of vanadium precipitation wastewater to adjust the pH of the filtrate to 11, stir for 150min, and then separate the solid from the liquid. The solid is the mixed calcium slag of calcium vanadate, calcium silicate, calcium sulfate and calcium hydroxide, the pH value of the calcium slag slurry can be adjusted to 2.5 by the sulfuric acid solution with a mass fraction of 20%, and the silicon and calcium in the solid form silicic acid and calcium sulfate as solids, separated from solid and liquid, the solid is a mixture of silicic acid and calcium sulfate, the liquid is a pure vanadium-containing solution with a vanadium concentration of 31.8g / L; add 27.8g of sodium carbonate to the filtrate, stir for 10min and then filter. The solid is calcium carbonate, and the filtrate is adjusted to a pH value of 2-3 with sulfuric ac...

Embodiment 2

[0043] A method for high-value treatment of elements in vanadium precipitation wastewater, comprising the following steps:

[0044] Add 73.1g of calcium oxide to 6L of vanadium precipitation wastewater to adjust the pH of the filtrate to 11, stir for 150min, and then separate the solid from the liquid. The solid is the mixed calcium slag of calcium vanadate, calcium silicate, calcium sulfate and calcium hydroxide, the pH value of the calcium slag slurry can be adjusted to 3 by the sulfuric acid solution with a mass fraction of 40%, and the silicon and calcium in the solid form silicic acid and calcium sulfate as solids, separated from solid and liquid. The solid is a mixture of silicic acid and calcium sulfate, and the liquid is a pure vanadium-containing solution with a vanadium concentration of 33.4g / L. Add 21.3g of sodium carbonate to the filtrate, stir for 10 minutes and then filter. The solid is calcium carbonate, and the filtrate is adjusted to a pH value of 2-3 with sul...

Embodiment 3

[0046] A method for high-value treatment of elements in vanadium precipitation wastewater, comprising the following steps:

[0047] Add 84.9g of calcium oxide to 7L of vanadium precipitation wastewater to adjust the pH of the filtrate to 11, stir for 150min, and then separate the solid from the liquid. The solid is the mixed calcium slag of calcium vanadate, calcium silicate, calcium sulfate and calcium hydroxide. The pH value of the calcium slag slurry can be adjusted to 3.5 by sulfuric acid with a mass fraction of 50%. The silicon and calcium in the solid form silicic acid and Calcium sulfate is precipitated as a solid, and the solid and liquid are separated. The solid is a mixture of silicic acid and calcium sulfate, and the liquid is a pure vanadium-containing solution with a vanadium concentration of 32.5g / L. Add 24.2g of sodium carbonate to the filtrate, stir for 10 minutes, and then filter. The solid is calcium carbonate, and the filtrate is adjusted to a pH of 2-3 with...

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Abstract

The treatment method comprises the following steps: adjusting the pH value of the vanadium precipitation wastewater, stirring and heating, and carrying out solid-liquid separation to obtain a solid which is mixed calcium slag and a liquid which is a solution which does not contain ammonium radicals, silicon and vanadium; adding a decalcifying agent into the solution, stirring, and carrying out solid-liquid separation to obtain a solid calcium carbonate and a liquid calcium-free solution; hexavalent chromium in the solution is converted into trivalent chromium; trivalent chromium in the solution is converted into chromic hydroxide, solid-liquid separation is carried out, and chromic oxide is prepared from chromic hydroxide; evaporating and concentrating the solution, separating out sodium sulfate crystals in the solution, carrying out solid-liquid separation, and drying the solid to obtain high-purity anhydrous sodium sulphate; performing acid leaching on the solid mixed calcium slag, enabling vanadium in the solid to enter a solution to form a pure vanadium-containing solution, enabling silicon and calcium in the solid to form silicic acid and calcium sulfate to be separated out, performing solid-liquid separation, and extracting vanadium from the pure vanadium-containing solution. According to the method, the recovery rate of chromium is increased, the high-purity sodium sulfate solution without vanadium and chromium impurities is evaporated to prepare the high-purity anhydrous sodium sulfate, and high-value utilization of elements in the vanadium precipitation wastewater is achieved.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and more specifically, the invention relates to a treatment method for increasing the value of each element in vanadium precipitation wastewater. Background technique [0002] The production process of vanadium pentoxide mainly includes two kinds of vanadium slag sodium roasting and vanadium slag calcification roasting: the vanadium slag after crushing, ball milling and screening is mixed with soda ash or calcium compound and roasted, then soaked in water or acid. The vanadium-containing solution is controlled at a reasonable pH value, and vanadium pentoxide is prepared by sulfuric acid and ammonium sulfate acidic ammonium salt vanadium precipitation. This process will produce a large amount of acidic vanadium precipitation wastewater, whose main components are heavy metal ions vanadium, chromium, ammonium ions, chloride ions, sulfate radicals, sodium ions, and a small amount of silicon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B34/22C22B34/32C01F11/18C01G37/02C01D5/00C01B33/12C01F11/46
CPCY02P10/20
Inventor 黄先东白礼太帖秀梅王方兵王俊朱乐
Owner 四川省绵阳市华意达化工有限公司
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