New process of black and white tungsten separation

Since the wolframite and scheelite have different floating characteristics, the pH values ​​of the flotation agent and flotation medium used in the flotation are different. Hetero-tungsten ore is better in flocculating in weakly acidic medium, while scheelite is better in flotation in alkaline medium. The two flotations are simultaneously floated by a mixed flotation process, so that the choice of the agent and the pH of the medium Both must be balanced, the flotation effect of scheelite and wolframite is not optimal. The ore dressing index of the black tungsten mine is poor, and the recovery rate is low, only 15~20%, which restricts the recovery of the whole tungsten. The recovery rate of scheelite is generally about 65%; the chelate collector chooses black and white tungsten. The dosage of the medicament is large, and the cost of dressing is high. In response to such problems, research on black and white tungsten separation flotation has begun. In recent years, great progress has been made in the study of black and white tungsten separation flotation.

A. Strong magnetic shunting - a new technology for separate flotation of black and white tungsten

The Beijing Research Institute of Mining and Metallurgy proposed and adopted the “strong magnetic shunt—black and white tungsten separation flotation process” (see Figure 1). First, sulphide ore flotation, sulphide ore flotation tailings magnetic separation (using high gradient magnetic separator), strong magnetic separation concentrate for black tungsten flotation, black tungsten concentrate; strong magnetic separation tailings White tungsten flotation, the production of white tungsten coarse concentrate, white tungsten coarse concentrate by heating flotation to produce scheelite concentrate, white tungsten flotation tailings into the fluorite flotation.

Picture 25

In the process flow, the mineral composition of the slurry on both sides after the strong magnetic splitting is simplified. When the hematite and scheelite are floated separately, the interference factors of the beneficiation are relatively reduced. According to the different characteristics of the black and white tungsten minerals, different floats are formulated. The selection conditions, the process technology is mature and reliable; the adaptability to the ore is strong, and it is not affected by the fluctuation of the proportion of black and white tungsten minerals. The tungsten selection index is stable. From April 18th to July 6th, 2009, Beijing Research Institute of Mining and Metallurgy conducted on-site industrial test at the 380 ore dressing test base of Shizhuyuan. Industrial test technical indicators: the recovery rate of raw ore reached 76.52%, which was 10 times higher than the original process. Percentage points. The white tungsten flotation process does not require the addition of a combination inhibitor with strong fluorite inhibition, which creates conditions for fluorite flotation; the separation of weak magnetic minerals such as cassiterite and garnet by magnetic characteristics through high gradient strong magnetic process It creates conditions for the recycling of cassiterite in non-magnetic mineral tailings. In the processing of fine-grained black and white tungsten ore and wolframite with a high proportion of wolframite, a high magnetic separation-flotation process can be used to obtain a higher black tungsten concentrate grade and recovery rate.

B. Floating-magnetic-floating preferential flotation sulphur tungsten beneficiation process

In the "Eleventh Five-Year" key project, the Guangzhou Research Institute of Nonferrous metals proposed and studied "floating - Magnetic - floating process" (see Figure 2). The process flow is: after the demineralization and concentration of the sulfide ore flotation tailings, the white tungsten flotation is first carried out, the white tungsten flotation tailings enters the strong magnetic separation (using a high gradient magnetic separator), and the strong magnetic concentrate is concentrated. Entering the black tungsten flotation, the strong magnetic tailings enter the fluorite flotation. The scheelite and the wolframite are floated under their optimal floatable conditions. In the industrial test of 39 consecutive classes from April 4 to 16, 2009, the recovery rate of raw ore tungsten was 76.82%. The actual recovery of tungsten is 10% higher than the original process (black and white tungsten mixed flotation).

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Due to the difference in floatability between scheelite and wolframite, the optimum flotation conditions vary greatly. Some of the scheelite is iron-bearing scheelite, which has weak magnetic properties and uses float (white tungsten). - Magnetic (black tungsten)-floating (black tungsten) step-by-step beneficiation method, while the white tungsten heated flotation tailings are returned to the high-gradient magnetic separator in the main process, which not only guarantees the white tungsten concentrate The grade and recovery rate, and the increase of the black tungsten flotation to the ore grade, effectively reduce the tail, which is more conducive to the subsequent black tungsten flotation. The development and successful application of high-efficiency white tungsten collector TAB-3 has good selective collection effect on iron-bearing scheelite and less dosage. The use of high-efficiency white tungsten collector TAB-3 in the white tungsten preferential flotation to effectively separate the scheelite and the wolframite is the key to the success of the process. Through the high gradient strong magnetic separation process, the magnetic properties can be used to separate weak magnetic minerals such as cassiterite and wolframite, which is beneficial to the comprehensive recovery of tin metal minerals. "Floating-magnetic-floating" sulphur-leaf preferential flotation process, white tungsten flotation tailings adopts strong magnetic separation, effectively improves the black tungsten flotation grade and recovery under the condition of ensuring the scheelite concentrate grade and recovery rate. rate.

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