Sorting method for low-grade wolframite and scheelite

Abstract

The invention discloses a sorting method for low-grade wolframite and scheelite. The sorting method for the low-grade wolframite and scheelite includes the steps that after wolframite and scheelite ore with the particle size being 0.20-0.50 mm is subjected to roughing with a spiral concentrator and concentration with table concentrators, tungsten rough concentrate I is obtained; after wolframite and scheelite ore with the particle size being 0.04-0.20 mm is subjected to roughing with spiral chutes and concentration with table concentrators, tungsten rough concentrate II is obtained; and sulfur flotation tailings are obtained by conducting sulphide ore flotation on wolframite and scheelite ore with the particle size being smaller than 0.04 mm, fine silt tungsten rough concentrate is obtained by conducting wolframite and scheelite mixing floatation on sulfur flotation tailings, a collecting agent for wolframite and scheelite mixing floatation comprises 60-120 g / t of xanthate, 400-600 g / t of a wolframite collecting agent and 30-50 g / t of a scheelite collecting agent, and fine silt tungsten concentrate is obtained by conducting concentration on the fine silt tungsten rough concentrate through a centrifugal separator. According to the sorting method, the overall recovery rate of the obtained tungsten concentrate is high, the utilization rate of mine resources is high, and production cost is low.

Description

technical field [0001] The invention relates to a method for beneficiating tungsten ore, in particular to a method for separating black and white tungsten ore. Background technique [0002] The low average grade of tungsten ore deposits and the semisymbiosis of black and white tungsten make the ore dressing process difficult, which is the main reason restricting the development of tungsten ore. The mineral composition, mineral characteristics and intercalation relationship of the ore are far more complex than the quartz vein type tungsten ore, and there are many types of minerals, which are refractory ores. The grades of tungsten and molybdenum in the raw ore are low, most of the tungsten grades are between 0.1% and 0.3%, the average grade is 0.233%, and the average grade of associated molybdenum is 0.024%, so it is difficult to obtain qualified tungsten concentrates and molybdenum concentrates. Big. The particle size of useful mineral embedding varies from fine to fine, a...

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Problems solved by technology

[0003] CN104128251A discloses a beneficiation method of tungsten fine slime, which aims at the secondary product tungsten fine slime of each operation of the tungsten separation process, first classifies the tungsten fine slime into two grades of greater than 0.074mm and less than 0.074mm, and classifies the tungsten fine slime greater than 0.074mm The tungsten fine slime of mm is beneficiated by shaking table gravity separation. For tungsten fine slime smaller than 0.074mm, multiple flotation methods are used, but only shaking table gravity separation is used. Due to the large area occupied by the shaking table and the small processing capacity, More shakers and manual adjustments are required to achieve the required scale of processing capacity, resulting in increased labor costs and investment; the flotation reagents used in the flotation can only recover scheelite, and cannot simultaneously float black tungsten and scheelite, and The recovery rate of this tungsten fine slime beneficiation method only reaches 61.74-65.64%

[0004] CN105312148A discloses a beneficiation and enrichment method suitable for associated scheelite in molybdenite flotation tailings, which obtains wolframite through magnetic separation, and then obtains scheelite through classification and gravity separation, and its final tungsten concentrate The grade is only 40.83-42.28%, and the recovery rate is 56.35-64.70%. The main reasons for the low grade and recovery rate are as follows: 1. The -0.045mm fine-grained grade in this classification uses a shaker and a centrifuge. Gravity separation treatment, but the gravity separation effect of the shaker on the -0.045mm fine particle grade is poor; 2. In this method, the secondary classification is only for the middle ore obtained after the primary classification, and the grade of the concentrate is low

[0005] The recovery rate of tungsten concentrate obtained by the current separation method of low-grade black and white tungsten is low and mixed flotation of black and white tungsten cannot be realized, and the utilization rate of mine resources is not high enough

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