What Are The Utilization Ways of Sulfuric Acid Residue? Introduction Of Sulfuric Acid Slag Grinding Mill Equipment For Utilization

Sulfuric acid slag refers to pyrite cinder (also known as pyrite cinder) produced in the process of sulfuric acid production, which is one of the main solid wastes produced by the chemical industry. Sulfuric acid slag is a very valuable secondary resource. If pyrite cinder can be used, the shortage of iron ore supply can be greatly alleviated. The comprehensive utilization of pyrite cinder can not only protect the environment, but also avoid the waste of resources, and can also win profits for enterprises. What are the utilization ways of sulfuric acid residue? As a manufacturer of sulfuric acid slag grinding mill, HCMilling(Guilin Hongcheng) will introduce the specific content below.

The first way to use sulfuric acid slag: as building material

1. Brick production after grinding by sulfuric acid slag grinding mill: due to the low content of silica, alumina and other active substances in the sulfuric acid slag, a small amount of coal slag and coal ash must be added, and lime is used as the cementitious material. The sulfuric acid slag is prepared by mixing ingredients, rolling, pressure forming, steam curing and other processes. The use of sulfuric acid slag can not only produce ordinary wall tiles, but also prepare colored wall tiles and colored glazed tiles.

2. Sulfuric acid slag can be used to produce cement flux: Sulfuric acid slag can be used as cement flux, which can not only increase the content of iron oxide and reduce the modulus of bauxite compared with the composition of Portland cement raw material mixture, but also increase the strength of cement, enhance the corrosion resistance of mineral water, and reduce its thermal cracking. In addition, it can also reduce the roasting temperature, which is beneficial to reduce the heat consumption and prolong the service life of the refractory bricks in the furnace. There is no strict requirement for the quality of sulfuric acid slag in cement production, and 30% iron content can be used. The use of sulfuric acid slag instead of iron ore powder as a flux for cement sintering is a direction of its comprehensive utilization, especially suitable for the treatment of sulfuric acid slag with low iron content or high sulfur, arsenic and other impurities.

The second way to utilize sulfuric acid residue: extracting valuable metals

In order to avoid the pollution of sulfuric acid residue to the environment, sulfuric acid residue is used as the raw material, through the addition of active reducing agent (C6H1206), the waste sulfuric acid is used to directly reduce and leach iron and produce iron yellow, and then the ternary extractant with P204 (di-2-ethylphosphoric acid) as the main body is used to extract copper from the leaching solution, and gold and silver are extracted from the leaching residue by the whole slime cyanidation and zinc powder replacement process, so that the valuable metals in the cinder are more economically and effectively recovered and utilized.

The third way to utilize sulfuric acid slag: preparation of iron series products

1. Utilization and recovery of iron from sulfuric acid slag: The method of beneficiation is the most widely used and has achieved remarkable results. Common processes include: magnetic roasting - magnetic separation, gravity separation, gravity separation - magnetic separation, gravity separation - flotation and other combined processes.

2. Preparation of ferrous sulfate from sulfuric acid slag: preparation of ferrous sulfate from pyrite cinder mainly involves sulfuric acid direct acid leaching reduction method and high-temperature reduction method. The high temperature reduction method has the advantage of high recovery rate of iron in the slag, while the disadvantage is that the reaction temperature is as high as 800 "C, the reaction process energy consumption is high and the equipment is expensive; the direct acid leaching reduction method has low reaction temperature and energy consumption, but the recovery rate of iron in the slag is low.

3. Preparation of iron red, iron yellow and iron black from sulfuric acid slag: The main methods of producing iron red from sulfuric acid slag are dry method and iron yellow calcination method. The dry method is to calcine the Fe203 obtained from the green alum (FeSO4 ● 7H2O) prepared from the calcined slag, and then wash, dry and crush it to obtain the iron red product. The dry method of preparing iron red from cinder can also use the principle of reverse flotation, adding ether amine and xanthate to remove silicon and sulfur, then alkali leaching and ammonium salt leaching to remove impurities, and then oxidizing and roasting at 600~700 ° C, and grinding to 300 through sulfuric acid slag using grinding equipment μ M is the product.

Introduction of sulfuric acid slag grinding mill equipment: sulfuric acid slag has great pollution to the environment, but it is also a very valuable secondary resource. It has broad application prospects in building materials, extraction of valuable precious metals, preparation of iron products and other aspects. In recent decades, domestic and foreign researchers have made great progress in the application of pyrite slag in bio-pharmaceuticals. The utilization of sulfuric acid slag is inseparable from the support of sulfuric acid slag grinding mill equipment. Sulfuric acid slag is mostly pyrite sintering slag, which is agglomerated dry slag, suitable for dry grinding. The equipment such as sulfuric acid slag Raymond mill and sulfuric acid slag vertical roller mill for sulfuric acid slag produced by HCMilling(Guilin Hongcheng) are all dry grinding mill equipment that can be beneficial to the utilization of sulfuric acid slag. Machinable 3-380 μ M fine sulfuric acid slag powder, output and equipment model can be selected according to demand. If you have any demand for the utilization of sulfuric acid slag grinding mill, please contact HCM for details of the equipment.