Siderite beneficiation process

Siderite Gravity Separation Method

Siderite gravity separation is mostly suitable for processing coarse and medium-grained siderite beneficiation. There are two methods: heavy media beneficiation and jig beneficiation.

1. Heavy medium siderite selection

Use fine particles of dense and easy-to-regenerate solids (such as ferrosilicon, magnetite, galena) and water to be mixed. The resuspension liquid with adjustable density is used as the sorting medium. The mineral particles with a density greater than the density of the medium sink, and the mineral particles with a density smaller than the density of the medium float to be sorted. This method has large production capacity, low investment, high separation accuracy according to specific gravity, strong adaptability to the particle size of the selected ore, and is suitable for large-scale production. Commonly used siderite heavy medium mineral processing equipment includes heavy medium vibration tank, heavy medium cyclone and heavy medium vortexer.

2. Jig siderite selection

To sort the ores according to the density difference between the ores, the ore particle mixture is placed into a vertically ascending and descending variable-speed medium flow, and then its separation process. The jig has the characteristics of simple structure, low investment, high sorting efficiency, high recovery rate, and low operating costs. Under suitable conditions, it can remove about 80% of the waste rock in siderite.

Strong Siderite Magnetic Separation Method

Strong Siderite Magnetic Separation is to first subject the ore to weak magnetism, and then select and remove iron minerals with higher magnetic properties to produce tailings. The ore is separated by strong magnetic separation, and the steps can be divided into: crushing, screening, grinding, screening and grinding, desliming, strong magnetic separation and storage.

Crushing: Send the siderite to be selected into the crusher for primary crushing to obtain <10mm particles and powder;

Sifter Points:Put the particles and powder into a screening machine with a strong magnetic field for screening to obtain magnetic siderite particles and powder. The particles and powder that fail the screening are discarded;

Grinding:Put qualified particles and powder into the ball mill for wet ball grinding to obtain slurry;

Screening and grinding:Transport the slurry to The spiral screening machine is used for screening, and particles >100um are re-ball milled;

Desliming:Put <100um siderite ore into the mud clearing box and then into the desliming tank. , carry out desliming treatment, and repeatedly enter the mud clearing box and desliming tank several times to obtain the deslimed siderite ore;

Strong magnetic separation:Put the deslimed siderite ore The siderite ore is sent to the wet strong magnetic separator for selection. The wet strong magnetic separator outputs high-grade magnetic concentrate powder, low-grade magnetic tailings ore powder and medium-grade magnetic mid-mine ore powder in three channels. ;

Storage: Put the concentrate powder into the storage, and transport the medium ore particles and tailings to the tailings field.

Siderite flotation method

This method is mainly suitable for processing fine-grained iron ore, and has two processes: forward flotation and reverse flotation.

Siderite positive flotation:It is divided into acidic positive flotation and alkaline positive flotation. Acidic positive flotation grinds the siderite to the required particle size. The slime is then removed, and the deslimed product is flotated with a fatty acid collector in a neutral or weakly acidic medium to flotate iron minerals. Alkaline positive flotation is to grind the siderite ore to the required particle size without desliming, add soda as a regulator, and use oxidized paraffin soap and Tar oil as collectors in a weakly alkaline medium to perform flotation.

Siderite reverse flotation:It is also divided into two types: anionic collector reverse flotation and cationic collector reverse flotation. Anion collector reverse flotation is to add calcium salt to activated quartz in a strong alkaline medium, mix sodium hydroxide or sodium hydroxide with sodium carbonate, adjust the pH to above 11, and use starch or lignosulfonate as the Iron mineral inhibitors use fatty acids and their modified agents as collectors to flotate quartz and other silicates. Cationic collector reverse flotation uses sodium carbonate to adjust the pH of the slurry to 8-9, uses starch, dextrin, tannin, etc. to inhibit siderite minerals, and uses amine collectors to float quartz gangue and collect The main agent is ether amine, followed by fatty amine.

Magnetized roasting of siderite - weak magnetic separation method

After siderite is roasted in a neutral or weak reducing atmosphere, the carbon dioxide in the ore will be decomposed, and the iron mineral The magnetism is significantly enhanced, while the magnetism of the gangue minerals does not change much, so weak magnetic separation can be used for separation after roasting. The roasting part includes reduction roasting, neutral roasting and oxidative roasting.