Oolitic hematite dressing method

Abstract

The invention provides an oolitic hematite dressing method; slime dispersing agent and mineral grains are mixed fully and uniformly during an ore grinding process by adding the slime dispersing agent in the ore grinding step, so that the effect of suppressing granular poly groups is quickly displayed in a size mixing process, the dispersion capability of the slime dispersing agent in a unit used amount is fully displayed, the dispersion efficiency of the mineral grains is significantly improved, and the defect of the prior art that the dispersion efficiency can be guaranteed by stirring for a longer time after ore grinding is overcome; and according to the oolitic hematite dressing method, the process is simple, the used amount of reagent is small, a process is short, a good dressing effect in treating oolitic hematite which is difficult to dress is achieved, the iron grade can be improved, the content of elements phosphorus and silicon can be reduced, iron ore which meets the requirements of a smelting process and can be directly melt is obtained, and the development and the utilization of the inactive resource oolitic hematite become feasible.

Description

technical field [0001] The invention relates to a beneficiation method of hematite, in particular to a beneficiation method of oolitic hematite. Background technique [0002] Oolitic hematite is currently recognized as one of the most difficult types of iron ore at home and abroad. Because of its extremely fine particle size, it often coexists or wraps with siderite, oolitic chlorite and phosphorus-containing minerals. , Therefore, this type of iron ore resources have basically not been utilized. But it has abundant reserves, and 1 / 9 of my country's iron ore resource reserves is oolitic hematite. Oolitic hematite often forms large-scale mines, such as the Lorraine iron mine in France, the Clinton iron mine in the United States, the Xuanlong iron mine in northern my country, and the Ningxiang iron mine in the south. With the rapid development of my country's iron and steel industry, the reserves of rich iron ore and easy-to-select lean iron ore are becoming increasingly exh...

AI Technical Summary

Problems solved by technology

[0003] In recent years, relevant domestic research units have adopted gravity separation and magnetic separation techniques to improve the grade of iron concentrate, but the dephosphorization effect is not obvious; adopting raw ore roasting-magnetic separation-chemical phosphorus reduction process can obtain iron concentrate with a phosphorus content of about 0.1%. Mineral products, but the process is difficult to engineer; adopting the raw ore flash reduction magnetization roasting-magnetic separation-reverse flotation process can obtain better technical indicators, but the grinding particle size is extremely fine (the grinding fineness is -0.037mm The ore accounts for 95.83wt%), which not only leads to high cost of the process, but also makes it difficult to implement industrially, and the degree of fine grinding is too high, the minerals will produce mud in different degrees, and the muddy material is easy to change from a dispersed state to an agglomeration in water. Harmful effects of the flotation process

[0004] There are prior art reports that in the separation process of oolitic hematite, a slime dispersant is added after grinding to improve the dispersion effect of fine-grained materials in the pulp, but this method has high requirements on the pH of the pulp, and only when alkali High dispersion rate (specifically 70-80%) can be obtained only under the condition of high pH (pH8~11), and the amount of slime dispersant is relatively high, generally not less than 150g slime dispersant / t raw ore. At the same time, When the amount of slime dispersant is small, the mass fraction of ore in the pulp should not be too high, that is, when the ore content in the pulp increases, the viscosity of the pulp will be higher, and the amount of slime dispersant will increase accordingly

On the other hand, adding a slime dispersant to the ore pulp after grinding requires a long stirring time to obtain the ideal dispersion effect due to the agglomeration of fine-grained materials, prolonging the production cycle and increasing energy consumption.

[0005] It can be seen that the previous research results failed to realize industrial application due to unsatisfactory indicators, complicated process, lack of equipment, or high cost, so that the oolitic hematite with huge reserves has not been developed so far. use it as a dull mine