Method for Comprehensive Recovery of Valuable Minerals from River Tailings

A tailings and river channel technology, applied in chemical instruments and methods, wet separation, solid separation, etc., can solve the problems of comprehensive recovery difficulties, low recovery rate, single element recovery, etc., to save a lot of money and reduce emissions , Optimizing the effect of the ecological environment

Active Publication Date: 2015-07-29
湖南省环境保护科学研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the technical problems that the existing multiple heavy metals in river tailings can only recover a single element, the comprehensive recovery is difficult, and the recovery rate is low, and provides a method for comprehensively recovering valuable minerals from river tailings

Method used

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  • Method for Comprehensive Recovery of Valuable Minerals from River Tailings

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specific Embodiment approach 1

[0015] Specific implementation mode one: the method for comprehensive recovery of valuable minerals from river tailings in this embodiment is carried out according to the following steps:

[0016] 1. The river tailings are pre-selected and thrown by a sawtooth wave jig and / or spiral classifier to obtain river tailings with a particle size d≤2mm, and then ball milled by a ball mill to obtain ore pulp;

[0017] 2. Pass the ore pulp obtained in step 1 through a magnetic separator to obtain iron concentrate and first-grade tailings after magnetic separation;

[0018] 3. The primary tailings are selected by shaking table to obtain the secondary concentrate and secondary tailings;

[0019] 4. Secondary concentrate flotation of arsenic-iron-sulfur ore to obtain arsenic-iron-sulfur ore and third-grade tailings;

[0020] 5. Three-stage tailings flotation lead-zinc concentrate to obtain lead-zinc concentrate and four-stage tailings;

[0021] Sixth, the fourth-grade tailings flotation ...

specific Embodiment approach 2

[0023] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that during the pre-selection of tailings in step 1, the river tailings with a particle size of d are pre-selected and discarded, and the river tailings of 0.45mm≤d≤2mm use sawtooth The wave jig pre-selects the tailings; for the river tailings with a particle size d<0.45mm, the spiral classifier pre-selects the tailings. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0024] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that the particle size d≤0.165mm of the river tailings in the pulp in step one, and the mass percentage of the river tailings in the pulp is 95% to 98%; other It is the same as the specific embodiment 1 or 2.

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Abstract

The invention discloses a method for comprehensively recovering valuable minerals from river course tailings, relates to a method for recovering valuable minerals and aims to solve technical problems that only a single element can be recovered from various heavy metals in existing river course tailings, the comprehensive recovery is difficult and the recovery rate is low. The method comprises the steps as follows: ball milling is performed on the river course tailings after preliminary selection and tailing discarding so as to obtain ore pulp; iron ore concentrates and first-class tailings are obtained after magnetic separation of the ore pulp; concentration is performed on the first-class tailings through a table so as to obtain second-class concentrates and second-class tailings; flotation is performed on the second-class concentrates so as to obtain arsenic-iron-sulfur medium sand and third-class tailings; flotation is performed on the third-class tailings so as to obtain lead-and-zinc concentrates and four-class tailings; flotation is performed on the four-class tailings so as to obtain tin concentrates and fifth-class tailings; and after the second-class tailings and the fifth-class tailings are dried, sand for manufacturing bricks is obtained. The recovery rate of the iron ore concentrates is in a range of 33%-35%, the arsenic-iron-sulfur recovery rate is in a range of 22%-24%, recovery rates of lead and zinc in the lead-and-zinc concentrates are in ranges of 18%-20% and 60%-62% respectively, and the recovery rate of the tin concentrates is in a range of 40%-42%.

Description

technical field [0001] The invention relates to a method for comprehensively recovering valuable minerals from river heavy metal tailings, and belongs to the technical field of tailings comprehensive utilization. Background technique [0002] In the non-ferrous metal beneficiation process, useful minerals are extracted, and other gangue minerals are discarded as tailings. The discarded tailings often contain a certain amount of components that can be comprehensively recycled, and the components vary with the nature of the ore. my country is one of the countries with the largest stock of tailings. According to statistics, my country's annual discharge of tailings is about 300 million tons, and tailings account for 30% of the total solid waste in the country. The annual discharge of tailings not only needs to occupy more than 30,000 mu of arable land, but also pays a stacking cost of up to 1 billion yuan. More importantly, long-term stacking, especially the long-term stacking...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B03B7/00
Inventor 尤翔宇向仁军成应向邱亚群漆燕张青梅姜平红刘湛李二平陈灿
Owner 湖南省环境保护科学研究院
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