The main products of the roasting equipment, if they are solid materials, should be physicochemically suitable for subsequent operations and provide a suitable physical state. Reverberatory furnace fired with a metal, such as copper material after calcination should be fines. On the contrary, blast furnace lead smelting must be a certain size of agglomerate; the main product of the roasting process, such as gas, has certain requirements in terms of dust and impurity content. The main industrial roasting technologies are furnace roasting, suspension roasting, boiling roasting and sintering roasting.

1. Furnace roasting

It is carried out in a multi-hearth furnace with 8 to 12 layers of hearth. The ore is added from the top and descends from a layer within the furnace, at which point the sulfide ore particles are brought into contact with the ascending gas stream for roasting. The inner wall is lined with refractory bricks, and the rotating cymbal arm is coupled to the shaft on the central axis, and the ore is pushed to the outer edge or the inner edge opening to the next layer. Rotate the arm to cool. Each day, the lump ore charge can be calcined from 100 to 200 tons. Usually, the process is self-heating, and the charge is oxidized enough to provide heat.

2, floating roasting

Improved from multi-cylinder roasters. Studies on multi-cylinder roasting have found that oxidation occurs mainly on the surface of the ore that is in contact with the furnace gas, especially from the moment one layer falls to the other, and the suspension roasting is developed accordingly. The roasting is carried out in a multi-hearth furnace similar to the removal of the middle layers. The concentrate is usually wet; after the upper one and the second layer are dried, it falls through the combustion chamber, and the roasting ore is collected and collected in the bottom layer and discharged from the furnace. . In this process, the amount of combustion is insufficient, and the auxiliary fuel needs to be burned to maintain the calcination temperature.

3, boiling roasting

Also known as fluidized roasting, it is the application of solid fluidization technology in chemical engineering and metallurgy. In the boiling roaster, the ore particles are calcined in a suspended state, and the bed is composed of an ascending air current and a moving group of slag particles, and the gas and the solid particles are vigorously pulsated in the bed, thereby accelerating the gas-solid phase. The transfer process is therefore high in calcination and uniform in bed temperature.

Application of the chemical industry boiling roaster metal sulfides (including a floating or crushed mineral ore, etc.) oxidizing roasting, roasting sulfated magnetization roasting operations, both during the sulfur dioxide gas. With the oxidation of metal sulfides, there is a reaction heat release, and most of the reactions can proceed spontaneously. The resulting slag is used as a metallurgical feedstock, and the sulphur dioxide gas produced is used to make sulphuric acid or to make a cooking liquor from a sulphate paper mill.

Compared with the lump ore multi-hearth furnace, the boiling roaster has the following characteristics: 1 the roasting strength is several tens to hundreds of times higher; 2 the slag residual sulfur is low; 3 the low grade ore can be calcined; 4 the furnace gas has a high SO2 concentration. Low concentration of SO3; 5 In the process of roasting ore roasting, a large amount of heat can be recovered to generate medium-pressure steam, of which 35 to 45% of the vapor is obtained through the cooling pipe in the boiling layer; 6 the temperature of the hearth is uniform; 7 simple structure, no rotating parts , investment province, less maintenance costs; 8 high degree of automation, low operating costs; 9 driving quickly and convenient, less air pollution caused by parking. However, the boiling furnace furnace gas is more dusty, and the air blower power consumption is larger.

Co Rotating Twin Screw Extruder

The barrel of Twin Screw Extruder can be opened in minutes. This makes product changeover, maintenance and research fast and easy. Both screws and barrels are designed using the building block principle. The screw configuration, barrel setup, feeding and venting, screen changing, way of pelletizing and process requirements, in consideration of the machine's versatility in other general applications.