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Comprehensive utilization method of gypsum containing tungsten and fluorine

A technology of fluorogypsum and solid-to-liquid ratio, which is applied in the fields of tungsten products, light calcium carbonate, and ammonium sulfate. It can solve the problems of utilization, resource waste, and low impurity content, and achieve simple operation, high recovery rate, and low equipment requirements. Effect

Inactive Publication Date: 2013-03-20
HUNAN SHIZHUYUAN NON FERROUS METAL +1
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Problems solved by technology

[0003] CaSO in tungsten-containing fluorogypsum 4 The grade is higher than that of conventional natural gypsum ore, but the impurity content is relatively small, and it contains a certain amount of tungsten. The existing technology has not made good use of this material, resulting in a waste of resources. If the tungsten-containing fluorogypsum can be comprehensively utilized, it will of great significance

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  • Comprehensive utilization method of gypsum containing tungsten and fluorine

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Embodiment 1

[0030] A comprehensive utilization method of tungsten-containing fluorogypsum, the process flow is as follows figure 1 As shown, the specific steps are:

[0031] (1) Fluorogypsum slag containing tungsten (composition CaSO 4 97.2%, Fe0.23%, Al0.45%, WO 3 0.17%), take 500g, slurry with 1500ml tap water, add 10ml of sulfuric acid with a concentration of 93%, leaching for 3h at 50°C, filter and wash to obtain refined calcium sulfate and impurity removal waste liquid; the iron and aluminum removal rate of the refined calcium sulfate They are: 87.85%, 95.38%, and the tungsten retention rate is 84.66%.

[0032] (2) Add 800ml of water containing 0.1g polyethylene glycol to the refined calcium sulfate to make a slurry, then add 800ml of a solution containing 400g of ammonium carbonate to decompose, after the addition is completed, keep stirring at 40°C for 3 hours, and finally obtain the calcium carbonate product and the solution containing The decomposition liquid of ammonium tungs...

Embodiment 2

[0039] A comprehensive utilization method of tungsten-containing fluorogypsum, the process flow is as follows figure 1 As shown, the specific steps are:

[0040] (1) Fluorogypsum slag containing tungsten (containing CaSO 4 97.2%, Fe0.23%, Al0.45%, WO 3 0.17%), take 500g, slurry with 1200ml tap water, add 15ml of sulfuric acid with a concentration of 93%, leaching at 20°C for 10h, filter and wash to obtain refined calcium sulfate and impurity removal waste liquid; the impurity removal process of the refined calcium sulfate iron, The elution rates of aluminum are 92.85% and 97.38%, respectively, and the retention rate of tungsten is 82.11%.

[0041] (2) Refined calcium sulfate is slurried by adding 500ml of tap water containing 0.1g of sodium dodecylsulfonate, and then adding 600ml of ammonium bicarbonate + ammonia water (containing 325g of ammonium bicarbonate and 360ml of 24% ammonia water) for decomposition , the process was reacted at 35°C for 6h, and the calcium carbonat...

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Abstract

The invention belongs to the field of chemical industrial waste residue comprehensive utilization and discloses a comprehensive utilization method of gypsum containing tungsten and fluorine. The method comprises the following steps: firstly, levigating residue of gypsum containing tungsten and fluorine, secondly, adding concentrated acid to the levigated residue, stirring, washing, removing impurities and obtaining refined calcium sulfate, thirdly, adopting additive agents and water to pulpify the refined calcium sulfate, fourthly, adding a certain amount of decomposing agents, stirring for a period of time under a heat preservation condition, filtering, washing, and obtaining decomposing liquid of light calcium carbonate products and ammonium sulfate containing tungsten, finally, adopting an ion exchange method and a precipitation method to prepare calcium tungstate products from the decomposing liquid and adopting an evaporation crystallization method to prepare ammonium sulfate products. The comprehensive utilization method of gypsum containing tungsten and fluorine has the advantages that the residue of gypsum containing tungsten and fluorine can be comprehensively processed under a mild condition, calcium, sulfur and tungsten resources of the residue can be respectively and sufficiently utilized, the light calcium carbonate products, the ammonium sulfate products and the calcium tungstate products have high additional value and are produced.

Description

technical field [0001] The invention relates to a method for comprehensive utilization of chemical waste residue, in particular to a method for producing light calcium carbonate, ammonium sulfate and tungsten products by utilizing tungsten-containing fluorogypsum. Background technique [0002] About 7% of my country's fluorite is associated with scheelite. The flotation properties of scheelite and fluorite are similar, and the fluorite concentrate obtained by flotation is often accompanied by scheelite. The tungsten-containing fluorite concentrate is obtained through the dry fluorine production process to obtain the tungsten-containing fluorine gypsum. At present, the slag is mainly sold to cement factories at a low price or used to make gypsum boards. The calcium and sulfur in it are only treated as low-end gypsum, and no high value-added products are produced. The tungsten is not used at all, and precious resources are lost in vain. [0003] CaSO in tungsten-containing f...

Claims

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Application Information

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IPC IPC(8): C01G41/00C01C1/24C01F11/18
Inventor 肖超李晓东刘景槐谢大鹏李婕李永华吴海国
Owner HUNAN SHIZHUYUAN NON FERROUS METAL
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