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A kind of clean conversion method of stone coal

A stone coal and clean technology, applied in the direction of alkaline earth metal silicate, silicate, process efficiency improvement, etc., can solve the problems of low yield and high cost, and achieve the effects of reduced production cost, huge environmental benefits, and elimination of pollution

Active Publication Date: 2011-11-30
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these methods have good effects on the treatment of stone coal roasting flue gas, these methods are generally high-cost and low-effective terminal treatment.

Method used

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  • A kind of clean conversion method of stone coal

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] NaNO containing NaNO recycled back to the reactor 3 The NaOH lye is heated to 150°C to form a high-concentration medium, in which NaOH+NaNO 3 50% by mass, 50% by moisture, NaNO 3 Accounting for NaOH+NaNO 3 2% of the total mass of solute. The stone coal is ball-milled for 36 hours, passed through a 350-mesh sieve, and then oxidized and roasted at 750°C for 5 hours, according to the solute NaOH and NaNO 3 The mass ratio of the total mass of the mixture to the stone coal is 6:1. Add the treated stone coal powder into the reactor under stirring, and mix and react completely at 150°C for 3 hours to obtain the decomposition product. Dilute the decomposition product with water, and after dilution The concentration of NaOH is 556g / L, the temperature is 30°C, the separation contains NaNO 3 Concentrated NaOH lye and solid phase containing sodium vanadate and sodium silicate, containing NaNO 3 The concentrated NaOH lye is evaporated and concentrated, and then returned to the ...

Embodiment 2

[0025] NaNO containing NaNO recycled back to the reactor 3 The NaOH lye is heated to 200°C to form a high-concentration medium, in which NaOH+NaNO 3 The mass concentration is 68%, moisture accounts for 32%, NaNO 3 Accounting for NaOH+NaNO 3 The total mass of solute is 4%. The stone coal is ball-milled for 24 hours, passed through a 350-mesh sieve, and then oxidized and roasted at 800°C for 3 hours, according to the solute NaOH and NaNO 3 The mass ratio of the total mass of the mixture to the stone coal is 5:1. Add the treated stone coal powder into the reactor under stirring, and mix and react completely at 200°C for 2 hours to obtain a decomposition product. Dilute the decomposition product with water, and after dilution The concentration of NaOH is 632g / L, the temperature is 80°C, the separation contains NaNO 3 Concentrated NaOH lye and solid phase containing sodium vanadate and sodium silicate, containing NaNO 3 The concentrated NaOH lye is evaporated and concentrated ...

Embodiment 3

[0027] Circulation back to the reactor containing NaNO 3 The NaOH lye is heated to 250°C to form a high-concentration medium, in which NaOH+NaNO 3 The mass concentration is 75%, moisture accounts for 25%, NaNO 3 Accounting for NaOH+NaNO 3The total mass of solute is 6%. The stone coal was ball-milled for 16 hours, passed through a 350-mesh sieve, and then oxidized and roasted at 850 °C for 1 hour. 3 The mass ratio of the total mass and the stone coal is 3:1. Under stirring, the treated stone coal powder is added to the reaction kettle, and the reaction is completely mixed at 250 ° C for 1.5 hours to obtain a decomposition product, and the decomposition product is diluted with water. After dilution The concentration of NaOH is 746g / L and the temperature is 110℃. 3 The concentrated NaOH lye and the solid phase containing sodium vanadate and sodium silicate, containing NaNO 3 The concentrated NaOH alkaline solution is evaporated and concentrated and returned to the reactor to...

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Abstract

The invention relates to a clean conversion method of stone coal. By the method, vanadium pentoxide and calcium silicate are prepared to serve as intermediates for preparing a series of vanadium products and white carbon black. The method comprises the following steps: carrying out ball milling and high temperature oxidation roasting on the stone coal, and decomposing a roasting material with a high-concentration medium of NaOH and NaNO3 in a reaction kettle; diluting and separating decomposed products to obtain a concentrated NaOH alkaline liquid containing NaNO3 and a solid phase containingsodium silicate and sodium vanadate; evaporating and concentrating the concentrated NaOH alkaline liquid containing NaNO3 and then returning back to the reaction kettle for further decomposition of the stone coal; carrying out hot water leaching and separation on the solid phase containing sodium silicate and sodium vanadate so as to obtain a solution containing sodium silicate and sodium vanadate and a slag phase containing ferrum magnesium calcium; after regulating the pH value of the solution containing sodium silicate and sodium vanadate with an acid, adding ammonium chloride for precipitating vanadium so as to obtain an ammonium metavanadate precipitate and a sodium silicate liquid phase; adding calcium hydroxide in the sodium silicate liquid phase so as to obtain a calcium silicate precipitate and a NaOH solution, and returning the concentrated NaOH solution back to the reaction kettle further decomposition of the stone coal; and calcining ammonium metavanadate so as to obtain aV2O5 product. Compared with the traditional sodium chloride high-temperature roasting process, the clean conversion method in the invention has the advantages that the pollution of chlorine and hydrogen chloride is eliminated; the total recovery rate of vanadium is above 75% and is improved by above 30%; and the recovery rate of silicon is more than 80%.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy, in particular to a vanadium-containing raw material, especially suitable for extracting V from refractory stone coal raw materials. 2 o 5 , and an efficient and clean production method for preparing white carbon black intermediate calcium silicate. Background technique [0002] The traditional stone coal vanadium extraction process is sodium roasting-acid leaching-extraction process, calcification roasting-acid leaching process, stone coal direct acid leaching and alkali leaching process, etc. The sodium roasting-acid leaching-extraction process is simple and low in cost, but the roasting process will cause chlorine and hydrogen chloride pollution, and the yield of vanadium is low, only about 45%, and its use has been gradually banned. Although the calcification roasting-acid leaching process reduces the pollution of roasting flue gas, it consumes a lot of acid, and the follow-up treatment is mor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B34/22C22B3/12C01B33/24
CPCY02P10/20
Inventor 周宏明郑诗礼李荐刘芙蓉郭雁军
Owner CENT SOUTH UNIV
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