Can natural tin ore be processed into handicrafts?

Can natural tin ore be processed into handicrafts?

(a) the mineral processing method of tin ore and the quality requirements for tin concentrate

Except for the low-impurity tin-rich ore containing more than 40% tin, which can be directly smelted without beneficiation, other tin ores generally need to be enriched with tin concentrate containing more than 40% tin before smelting.

In order to reasonably select the mineral processing method and technological process, it is necessary to find out the occurrence state of tin in the ore, the disseminated particle size of the tin deposit, the composition and content of ore substances, the structure, the mud content and the surrounding rock properties near the ore, and reasonably distinguish the natural types and industrial types of the ore.

Common beneficiation methods for different types of tin ores in China;

1. Easily beneficiated ores: such as oxidized ores, cassiterite-timely ores and tin-bearing granite-type ores, gravity separation or gravity flotation are often used.

2. Refractory ores: such as cassiterite-sulfide skarn ore and cassiterite-sulfide ore, generally, heavy-flotation-heavy, magnetic-flotation-heavy and other beneficiation processes or combined beneficiation and metallurgy processes are adopted.

3. Extremely refractory ores: such as tin-bearing magnetite skarn-type ores, magnetic-flotation-gravity or middling fuming treatment should be adopted.

Under the conditions of fine cassiterite particle size, high iron content, less monomer cassiterite and more iron-tin symbionts, some concentrator in China produce a variety of tin products, that is, some medium-rich ores (tin 3- 10%) and refractory ores (tin 1-2%), which are recovered with the continuous or even improved grade of tin concentrate.

When it is difficult to select qualified tin concentrate from tin-bearing and lead-bearing ores, tin-lead mixed concentrate can be selected and sent to smelter to produce tin-lead solder or other alloys.

Influence of common impurities:

Arsenic: It enters crude tin during smelting and is difficult to concentrate. If the arsenic content in essence is too high, it will affect the quality of tinplate, the non-toxicity of packaging and the hardness, brittleness and plasticity of tin metal. Arsenic evaporates into smoke (arsenic, etc.) ), polluting the environment and seriously endangering human body, animals and crops.

The high content of Bi will affect the tensile strength limit and Brinell hardness of cast tin.

Copper: High content will affect the stability and non-toxicity of tin coating. It affects the hardness, tensile strength and yield point of tin.

Iron: High content makes it difficult to separate iron from tin during smelting, which affects the plasticity, corrosion resistance and hardness of tin.