Difficult to choose tin ore dressing technology

The sorting of tin ore is mostly re-election method, and its process is divided into three parts: raw ore processing, ore separation and slime sorting.

Raw ore processing The principle treatment of the tin separation plant is generally composed of one or several items of operations such as washing, de-sludge, crushing, sieving, grading, ore blending, pulping and heavy medium pre-selection. Raw materials with large amount of mud and strong cementation should be washed and de-slued before entering the beneficiation operation; beneficiation can be carried out on the washing sieve in the cylindrical or trough washing machine, or several The equipment consists of a washing process; the equipment commonly used for deliming is a cone classifier (sediment bucket) and a hydrocyclone. The dewatering hydrocyclone is mostly small, and its diameter is 125mm, 75mm, 50mm or even >5mm. Tin ore beneficiation has special requirements for crushing, sieving, grading, etc.: crushing (including grinding) should be achieved but not exceeding the initial beneficiation particle size to ensure that the cassiterite only achieves monomer separation without over-grinding. Avoid over-grinding, usually using multi-stage grinding and multi-stage sorting processes; screening operations are usually prepared for jigging beneficiation; grading operations are prepared for shaker beneficiation; screening and grading are also often used to control crushing size s method. The re-selected pulping operation is completely different from the flotation of the flotation. The re-selected pulping is to provide the required concentration, fineness and suspension state for subsequent operations. Heavy medium pre-selection was developed after the 1970s. China uses heavy medium cyclones as pre-selected equipment. The United Kingdom, Australia and other countries have developed DWP vortex sorters since the 1980s; high media pre-selection has high de-abolization rate. From 20% to 25%, it is economically reasonable.

Mineral sand sorting The equipment used for sorting is mainly jigs and shakers. However, as the resources change, the size of the inlaid tin ore is more and more fine. The shaker has become the main equipment. There are usually four products in the tin shaker, namely concentrate, secondary concentrate, medium mine and tailings. The secondary concentrate in the tin-selecting process has a relatively coarse particle size. In addition to some of the monomeric cassiterite, there is a large amount of iron- tin combined body; the secondary concentrate of the whole plant is usually ground and ground, and then separately sorted. China calls this process "concentration and re-washing of secondary concentrates."

Sludge Separation China's typical process: centrifuge - belt chute - grooved mud shaker or suspended six-layer mud shaker sorting. In the case of smelting requirements of low grade (<10%), this process can even be simplified to a single centrifuge sorting process. The United Kingdom, Australia and other countries have developed four types of equipment for slime treatment, namely small hydrocyclone, cone concentrator, cross-flow belt sorter and rocking turner. The small hydrocyclone is mainly used to remove fine slime (<0.005 or 0.01mm grade) before the cassite flotation; the other three equipments are used for mineral processing.

The flotation of tin mud is a supplement to the re-election. It developed in the 1970s, and some tin-selecting plants in the United Kingdom, Japan, Germany, and Australia successively established flotation plants; China also established a cassite flotation plant in Guangxi Dachang and Yunnan Gejiu. Cassiterite flotation collector mainly organic arsenate, phosphate, and organic acid such as hydrochloric sulfosuccinate. Due to the high cost of sulphur flotation and the advancement of fine-grain re-election technology, cassiterite flotation has not been widely used.

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