I. Hydrometallurgical process of cobalt arsenide concentrate
The wet treatment of arsenic- cobalt concentrate is better with the Sergeino-Kuruman method and the Nobel-wave method of the French Yuqin Cobalt Plant. The process flow is shown in Figure 1.
Figure 1 Process of processing arsenic and cobalt concentrate in France
The Cherno-Kurman method is a condition for accurately controlling boiling roasting, and arsenic is removed by volatilization of As 2 O 3 . The oxidation of arsenide is mainly carried out as follows:
At the same time, some reactions continue to form cobalt arsenate. The high temperature and large gas-solid interface facilitate the volatilization of As 2 O 3 and promote the decomposition of arsenate. Therefore, boiling roasting can in principle be used to promote the arsenic removal of the concentrate by rapid heating. The produced arsenic-depleted slag is chlorinated and leached. The neutralized leachate, purify the noble metal, heavy metals, precipitation of iron remaining in solution, the solution or pressurizing electrolytic cobalt prepared by hydrogen reduction of cobalt powder. Co(OH) 2 may also be precipitated by adding soda and then calcined to Co 2 O 3 .
According to the Nobel-wave method, it is dissolved in a mixture of sulfuric acid and nitric acid, and arsenic can enter the solution. By cooling, most of the arsenic and gangue enter the primary leach residue and are separated from the solution containing most of the cobalt (the primary leaching rate of cobalt is 88% to 92%). 93 ℃ dissolved with water at an As 2 O 3, cooling and crystallization an As 2 O 3, dried and sold. The secondary leaching of the filter residue can make the total leaching rate of cobalt reach 99.5%. When the pH is low, the iron is precipitated with chlorine and limestone , and the arsenic in the solution precipitates together with the iron. The pure cobalt solution is precipitated in a trivalent cobalt state with chlorine and soda, and then Co(OH) 3 is reprocessed into a cobalt salt and cobalt oxide.
2. High pressure hydrometallurgical process of cobalt arsenide ore
In the 1950s, there were many studies on high-pressure hydrometallurgical processes for arsenic-cobalt ore, and China and the United States did more work. The following is a description of the high-pressure acid leaching process at the Garfield Cobalt Refinery, which was once produced in the United States, and the high-pressure alkaline leaching process at the Newbury Cobalt Plant.
(1) High-pressure acid leaching process of cobalt arsenide ore. The Garfield Cobalt Refinery handles arsenic-cobalt deposits in the Black Wu area. At the end of December 1955, it was produced by high-pressure acid leaching and high-pressure hydrogen reduction. When it encountered the anti-corrosion material of acid-immersed autoclave parts, the quality of cobalt powder was also poor. In November 1957, electrolysis was used instead of high-pressure chlorine reduction to produce metal cobalt. The process flow is shown in Figure 2.
Figure 2 High-pressure acid leaching process of cobalt arsenide ore
(2) High pressure alkali leaching process of cobalt arsenide. The Newber Cobalt Plant is a pilot plant built in 1957 that processes 30 to 60 tons of arsenic-cobalt ore and concentrate in Ontario, Canada. Co 2 O 3 powder was produced using high pressure alkaline leaching (Silmethod). The raw material components are (%): Co12, Ni3.0, Cu1.0, As45, Fe19, S20, Ag3000 to 4500 gram tons. The removal of arsenic from Ca 3 (AsO 4 ) 2 from the production process is characteristic.
Third, the arsenic-cobalt concentrate fire method - Niefa joint processing
This process is an old method that is more adaptable. The Godzilla Cobalt plant in West Germany before the Second World War used this method to treat arsenic and cobalt deposits in Morocco, Canada and Myanmar. The Canadian Delano Cobalt Plant is also an old manufacturer that uses this method.
A cobalt plant in China has processed arsenic-cobalt ore imported from Morocco, and its chemical composition is (%): Co9~l4, As40~60, Ni1.3~5, Fe5~10, Cu0.03~1, S1~5, MnO 0.4 to 1. The process of the plant's past treatment of arsenic-cobalt ore in Morocco is shown in Figure 3.
In the production, this process was found to be too long, the cobalt solution was continuously diluted to increase the amount of the treatment solution, the volume of the equipment was large, and more slag and liquid were produced. Therefore, it has been studied to remove impurities by domestic P204 extraction and extract nickel and cobalt, and to extract CoCl 2 solution by hydrochloric acid. The solution is prepared by the general method to obtain pure cobalt oxide powder suitable for cemented carbide.
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