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A method and device for comprehensive utilization of scheelite slag resources

A technology of scheelite and resources, which is applied in the field of recycling tungsten-containing waste, can solve the problems of complex treatment process, environmental pollution and high treatment cost, and achieve the effect of simple decomposition equipment, low production cost and simple process

Active Publication Date: 2020-10-02
XIAMEN TUNGSTEN +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for comprehensive utilization of scheelite slag resources in order to overcome the existing problems of scheelite slag as solid waste polluting the environment, complex treatment process, and high treatment cost. The method uses scheelite slag as solid waste. A raw material of phosphate rock, using sulfuric acid to leach scheelite slag, on the one hand, it can obtain artificial gypsum with good quality, which can be used in building materials and cement industries; on the other hand, it can obtain dilute phosphoric acid solution, which can be directly returned to the leaching step for use. Use does not affect the leaching rate of scheelite

Method used

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  • A method and device for comprehensive utilization of scheelite slag resources

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Experimental program
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Effect test

Embodiment 1

[0048] First put 10m into the reaction tank 3 Washing water (generated by washing the solid phase during filtration) and no brine, slowly add concentrated sulfuric acid 0.8m 3 , the concentration of sulfuric acid after stirring fully is 177.92g / L. Then feed steam to heat, and start to add 1552 kg of scheelite slag after heating to 80 degrees Celsius, and the reaction time is 2 hours. Stop heating after completion of the reaction and start to filter. The vacuum of the vacuum belt filter is -0.04Mpa. The obtained filtrate contains dilute phosphoric acid, in which the concentration of P is 47.74g / L and the concentration of sulfate radical is 5.65g / l, and it is reused in the alkali leaching process of scheelite during the alkali process of scheelite; the solid phase is dihydrate gypsum , and its moisture mass content is 41.73%.

Embodiment 2

[0050] First put 10m into the reaction tank 3 wash water and tap water, slowly add concentrated sulfuric acid 0.7m 3 , the concentration of sulfuric acid after stirring is 154.38g / L. Then feed steam to heat, and start to add 1535kg of scheelite slag after heating to 70 degrees Celsius, and the reaction time is 2 hours. Stop heating after completion of the reaction and start to filter. The vacuum of the vacuum belt filter is -0.04Mpa. The P concentration of the obtained dilute phosphoric acid is 43.88g / l, and the sulfate radical concentration is 4.18g / L, which is recycled to the scheelite alkaline leaching process in the scheelite alkaline process; the solid phase is dihydrate gypsum, and its water quality Content 39.37%.

Embodiment 3

[0052] First put 10m into the reaction tank 3 Wash with water and no salt water, slowly add concentrated sulfuric acid 1.6m 3 , the concentration of sulfuric acid after stirring is 316.61g / L. Then feed steam to heat, and start to add 3055 kg of scheelite slag after heating to 75 degrees Celsius, and the reaction time is 2 hours. Stop heating after completion of the reaction and start to filter. The vacuum of the vacuum belt filter is -0.04Mpa. The P concentration of the obtained dilute phosphoric acid is 81.15g / L, and the sulfate radical concentration is 4.23g / L, which is recycled to the scheelite alkaline leaching process in the scheelite alkaline process; the solid phase is dihydrate gypsum, and its water quality Content 38.65%.

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Abstract

The invention relates to a scheelite slag comprehensive resource utilization method and device. Firstly, a sulfuric acid aqueous solution is heated to obtain a hot sulfuric acid aqueous solution, scheelite slag is added into the hot sulfuric acid aqueous solution for thermal reaction, and then filtering is conducted to obtain plaster and filter liquor B containing phosphoric acid. The device comprises a material bin, a phosphorus leaching tank, a feeding pump, a vacuum belt filter, vacuum tanks, a vacuum pump, a dilute phosphoric acid tank, a washing water tank and a washing water pump. A scheelite slag comprehensive resource utilization technology is simple, the production cost is low, scheelite slag decomposition equipment is simple to connect, operation is convenient, and continuous industrial production is feasible.

Description

technical field [0001] The invention relates to a method for recycling tungsten-containing waste, in particular to a method and a device for the comprehensive utilization of scheelite slag resources. Background technique [0002] As an extremely important strategic reserve resource, tungsten has the highest melting point and boiling point among all metals, and it has excellent properties such as high hardness, wear resistance and corrosion resistance, so it has been widely used in various fields. my country's tungsten ore resources include wolframite and scheelite, among which the reserves of scheelite resources are much higher than wolframite, and wolframite is mostly used in the current tungsten ore smelting process, mainly due to the limitation of development technology, scheelite The ore exists in scattered forms, and has the characteristics of complex components, low grade, associated with other metals, and is not easy to develop and utilize. The smelting slag of scheeli...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/225C01F11/46
CPCC01B25/225C01F11/46C01P2006/82
Inventor 陈杰许圳安吴道奕王海军
Owner XIAMEN TUNGSTEN