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Technology for extracting scheelite from low-grade scheelite floatation tailing

A low-grade, scheelite technology, used in flotation, solid separation, etc., can solve the problems of poor flotation, fine embedded particle size, large amount of water glass, etc., to meet the requirements of reducing equipment, high removal rate, simple reaction Effect

Inactive Publication Date: 2015-11-04
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] This process is the main process of scheelite production in my country. Due to the poor effect of the inhibitor in the normal temperature roughing section, the content of scheelite in the tailings of this section is relatively high; Cloth, when the temperature is suppressed, the amount of water glass is very large, so the continuous scheelite can easily enter the tailings
At present, the scheelite flotation tailings WO of many mines 3 The content of these tailings has reached more than 0.2%, even as high as 0.4%, and these tailings have poor buoyancy due to the strong suppression of the inhibitor sodium silicate, and the embedded particle size is very fine, so it is very difficult to beneficiate. Recycling of scheelite in China

Method used

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  • Technology for extracting scheelite from low-grade scheelite floatation tailing
  • Technology for extracting scheelite from low-grade scheelite floatation tailing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] This embodiment takes the flotation tailings of scheelite in a certain place in Yunnan as the processing object, wherein WO 3 The content of Fe is 0.16%, the content of Fe is 10%, SiO 2 The content of Al is 43.54%, Al 2 o 3 The content is 5.43%.

[0031] (1) Add water to the flotation tailings of scheelite at a liquid-solid ratio of 4:1 to prepare a slurry, add sodium hydroxide to the slurry at a dosage of 50kg / t, control the stirring and leaching temperature at 75°C, and the leaching time is 30min; after the leachate is filtered and the leach slag is discharged, the leachate is reused for the leaching of scheelite tailings, using the same liquid-solid ratio (liquid-solid ratio of leachate and scheelite tailings) and leaching temperature as in the first leaching test and time, add 12kg / t of sodium hydroxide each time, and the leaching solution can be reused for leaching of scheelite tailings; the leaching solution can be reused 4 times, and the overall leaching rate ...

Embodiment 2

[0035] This embodiment takes scheelite flotation tailings in a certain place in Jiangxi as the processing object, wherein WO 3 The content of Fe is 0.17%, the content of Fe is 10.32%, SiO 2 The content of Al is 43.54%, Al 2 o 3 The content is 5.42%.

[0036] (1) Add water to the flotation tailings of scheelite at a solid-to-liquid ratio of 5:1 to prepare pulp, add sodium hydroxide to the pulp at a dosage of 100kg / t, control the stirring and leaching temperature at 80°C, and the leaching time is 90min; after the leachate is filtered, the leachate is reused for the leaching of fresh scheelite tailings. Under the same liquid-solid ratio (liquid-solid ratio of leachate and scheelite tailings), leaching temperature and time as in the first leaching test, Add 15kg / t of sodium hydroxide each time, and the leaching solution is reused for leaching scheelite tailings; the leaching solution is reused 5 times, and the overall leaching rate can reach 83.2%.

[0037] (2) Desiliconizatio...

Embodiment 3

[0040] This embodiment takes scheelite flotation tailings in a certain place in Yunnan as the processing object, wherein WO 3The content of Fe is 0.21%, the content of Fe is 6.02%, SiO 2 The content of Al is 25.21%, Al 2 o 3 The content is 38.33%.

[0041] (1) Add water to the flotation tailings of scheelite at a solid-to-liquid ratio of 3:1 to prepare pulp, add sodium hydroxide to the pulp at a dosage of 150kg / t, control the stirring and leaching temperature at 60°C, and the leaching time is 120min; after the leachate is filtered, the leachate is reused for the leaching of fresh scheelite tailings. Under the same liquid-solid ratio (liquid-solid ratio of leachate and scheelite tailings), leaching temperature and time as in the first leaching test, Adding 30kg / t of sodium hydroxide each time, repeated use 6 times, the leaching rate reached 87.59%.

[0042] (2) Desiliconization of leaching solution: heat the circulating leaching solution to 40°C, then slowly add hydrochlori...

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Abstract

The invention discloses a technology for extracting scheelite from a low-grade scheelite floatation tailing, and belongs to the technical field of ore separating. The technology comprises the steps of raw ore selecting, alkali liquor circulating leaching, purifying and silica removing, de-magging and scheelite crystallization. In the alkali liquor circulating leaching operation, a scheelite tailing is placed into a sodium hydroxide solution for agitation leach, and leaching liquid can be recycled repeatedly; in the purifying and silica removing operation, hydrochloric acid is added, silicic acid sediments are filtered and removed, a magnesium chloride solution is added, and desiliconizing is further carried out; and in the scheelite crystal operation, calcium chloride and the hydrochloric acid are used as precipitating agents, the scheelite is separated by crystallization again, and a high-grade scheelite concentrate is obtained. Low-grade scheelite floatation tailing resources are reutilized, the high-grade scheelite concentrate is obtained, the technology is simple, the economic value is high, and the technology for extracting the scheelite from the low-grade scheelite floatation tailing is suitable for application and popularization.

Description

technical field [0001] The invention relates to a beneficiation process for extracting scheelite from low-grade scheelite flotation tailings, and belongs to the technical field of beneficiation. Background technique [0002] Tungsten is the metal with the highest melting point and has high hardness, so it is widely used in aerospace, electronics, electrical appliances and chemical industries. According to statistics, in recent years, the world's annual demand for primary tungsten is 62,300 tons. my country is the country with the richest tungsten ore resources in the world. By the end of 2008, tungsten ore (WO 3 ) found a basic reserve of 2.35 million tons, including 460,000 tons of wolframite and 1.71 million tons of scheelite. With the consumption of easy-to-select wolframite resources, scheelite has become the main raw material for tungsten smelting in my country. However, my country's scheelite resources have the characteristics of less rich ore, more lean ore, more co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03D1/00
Inventor 曹沁波文书明张汉平谢峰
Owner KUNMING UNIV OF SCI & TECH