Gold-锑 ore beneficiation technology

The gold - niobium ore usually contains not less than 1.5 to 2 g/t of gold, and contains 1% to 10% of niobium. Ore antimony predominantly stibnite (Sb ₂ S ₂₎ the presence of the native; partially oxidized ore further contains antimony China (Sb ₂ O _3), antimony germanium stone (Sb ₂ O _4), senarmontite (Sb ₂ O ₃ ), Huang Qihua (Sb ₃ O ₄ OH) and other oxides. The most common associated minerals are pyrite and arsenopyrite.

The grain size of gold in the ore varies greatly, as is often the case in the pyrite.

The jigging and other re-election methods can recover both gold and ruthenium from the ground material of the gold-bismuth ore, but since the mineral is brittle, excessive pulverization should be avoided during the grinding process.

Priority flotation is the most effective way to handle gold-锑 ore. In many cases, abandoned tailings can be obtained and gold concentrates and antimony concentrates can be selected.

The gold-tantalum ore preferential flotation principle process is shown in Figure 1. Which process is chosen depends mainly on the total content of gold and strontium in the ore; the mineral form of strontium; the distribution of gold in the mineral components; the content of other metal sulphides in the ore; the state of occurrence of gold, and the like.

Figure 1 Principle flow of gold-tantalum ore preferential flotation

Processes I and II are for the mixed flotation of the cerium mineral, and then the mixed concentrate is separated into strontium concentrate and gold concentrate. Process III is a direct priority flotation of the ore; while Process IV is a flotation of the strontium mineral in an acidic medium.

The gold-bismuth concentrate is first roasted in two stages (the first stage temperature is 500-600 ° C, 1 h; the second stage temperature is 1000 ° C, 2 ~ 3 h), the antimony trioxide is collected by a dust collector, and the calcined sand is used first. After the dilute sulfuric acid is leached, the recovered gold is leached by cyanidation.

In some cases, gold-bismuth concentrates that are difficult to handle with wet methods can be sent directly to the smelting plant for smelting.

South Africa's Consorie Jerez-Marzisson gold processing plant handles gold-tantalum ore with a very complex composition. The ore contains Au5.63g/t and Sb11.59%. The plant adopts the process of re-election-flotation and gold concentrate roasting-cyanide and rhodium flotation. The production process is shown in Figure 2. Production indicators are shown in Table 1.

Figure 2 Production process of gold-tantalum ore in a gold selection plant in South Africa

Table 1 Production indicators