Whole process closed circuit beneficiation process for polymetallic ore Henan Hongxing

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Whole process closed circuit beneficiation process for polymetallic ore

The ore characteristics of polymetallic deposits are different from those of Dachang and Mengzi Bainiu deposits. They have the characteristics of uneven distribution of cassiterite, extremely low grade of recoverable metals in sulfide, high content of harmful elements and fine dissemination. In the process of determining the process flow, it is necessary to consider the reduction of arsenic content in copper concentrate during the process of "mixed flotation separation", And in the process of recovering cassiterite by gravity separation, the cassiterite is graded into different particle sizes by screening and grading, so as to improve the total recovery rate of cassiterite. In this paper, through the analysis of the ore dressing influence factors, decided to adopt the whole process closed-circuit beneficiation process.

 Closed circuit beneficiation process

1. Factors affecting mineral processing

The copper, sulfur, arsenic and tin in the deposit are of recyclable value, while cassiterite is unevenly distributed in all particle sizes, so it should be used Ball mill classifier table And other equipment for hierarchical re selection for recycling. Arsenopyrite is the main sulfide mineral with relatively coarse grain size and less relationship with cassiterite metasomatism. The content of copper in the raw ore reaches 0.11%, and it is mainly chalcopyrite which is easy to be floated. Its disseminated particle size is relatively fine, and it is associated with pyrite, arsenopyrite and other sulfide minerals. It can be predicted that the separation process of copper sulfur and copper arsenic will be the difficulty in obtaining qualified copper concentrate.

2. Whole process closed circuit beneficiation process

Based on the determined process flow and reagent system, the whole process closed-circuit process test is carried out. The process is divided into three parts: copper recovery by mixed flotation, tin recovery by gravity separation and cassiterite recovery by flotation. Copper concentrate, sulfur arsenic concentrate, gravity concentration tin concentrate and flotation tin concentrate can be obtained by this process. The copper concentrate contains 18.62% copper, 69.47% copper recovery, and less than 0.5% arsenic content in copper concentrate, which meets the copper concentrate metallurgical standard, indicating that copper and arsenic can be separated efficiently. Meanwhile, the tin content of gravity separation tin concentrate is 63.65%, and the total recovery rate of tin in gravity separation operation and desliming flotation operation reaches 70.61%. The closed-circuit results of the whole process show that the valuable metals can be recovered to a limited extent by using this process and reagent system.

A new type of small molecule inhibitor kn is used in the separation of copper and arsenic, which can inhibit arsenopyrite with less dosage under the synergistic effect of lime. The closed-circuit results of the whole process show that the arsenic content in copper concentrate is less than 0.5%, which is lower than the arsenic content standard of copper concentrate, which indicates the high efficiency and applicability of the inhibitor.

Four products including copper concentrate, arsenic concentrate, gravity concentration tin concentrate and flotation tin concentrate can be obtained by the whole process closed-circuit process. The copper concentrate contains 18.62% copper and 0.46% arsenic, and the copper recovery rate is 69.74%; the arsenic concentrate contains 28.54% arsenic, and the arsenic recovery rate is 49.33%; the gravity concentration tin concentrate contains 63.65% tin; the flotation tin concentrate contains 8.32% tin; the total recovery rate of tin is 70.62%.

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