Method for preparing phosphorus iron alloy by utilizing high-phosphorus iron ore and medium and low-grade phosphorus ore

Abstract

The invention discloses a method for preparing a phosphorus iron alloy by utilizing high-phosphorus iron ores and medium and low-grade phosphorus ores, and the method comprises the following steps of: uniformly mixing high-phosphorus oolitic hematites previously crushed into -3mm with the medium and low-grade phosphorus ores according to a certain proportion, and then agglomerating; carrying out reduction roasting on dried blocks by using coal as a reducing agent, wherein the roasting temperature is 1150-1200 DEG C, and the roasting time is 90-120 minutes; and grinding cooled reduction blocks to obtain a phosphorus iron alloy product. The method disclosed by the invention can be used for directly preparing the phosphorus iron alloy by taking poor oolitic hematites which are not effectively utilized at present and in an idle state and medium and low-grade phosphorus ore resources as raw materials, and has the advantages of short process flow, low cost, high product additional value, wide application prospect and easiness for industrialization realization.

Description

technical field [0001] The invention relates to a method for preparing a phosphorus-iron alloy, in particular to a method for preparing a phosphorus-iron alloy by utilizing high-phosphorus iron ore and medium-low grade phosphate ore. Background technique [0002] In recent years, the rapid development of the domestic iron and steel industry has led to an increase in the price of iron ore. However, due to the lack of high-quality iron ore resources in my country and the low utilization rate of complex and refractory ores, most domestic iron and steel enterprises have to import large quantities of high-priced Australia, Brazil, and India. High-grade iron ore from other countries has seriously affected the healthy development of my country's iron and steel industry. It is imperative to develop and utilize complex refractory ores in our country. [0003] my country has a total of more than 30 billion tons of complex and refractory iron ore resources that have not been effectivel...

AI Technical Summary

Problems solved by technology

[0009] Most phosphate rocks must be enriched by ore dressing to meet the production requirements of phosphoric acid and high-concentration phosphate fertilizers. However, there are the following problems in the beneficiation and enrichment of phosphate rocks: on the one hand, phosphate rocks are dominated by sedimentary phospholiths, and there are few easy-to-beneficiation ores. There are many colloidal phosphate rocks that are refractory to separation, and the processing difficulty is high, and the processing cost is high; on the other hand, a considerable amount of phosphorus will be lost in the processing process, and the lower the grade of phosphate rock and the higher the grade of concentrate, the greater the loss of phosphorus in the processing process In addition, if a large number of tailings left by mineral processing are not properly disposed of, there will be a greater environmental risk, which will cause serious pollution to the soil and water environment; in addition, the tailings also contain a large amount of phosphorus, magnesium and other elements. Less than effective use, resulting in a large waste of resources

[0020] In summary, due to the complex nature of high-phosphorus oolitic hematite, although the existing technology can recycle the iron component in it, phosphorus is removed as a harmful element and is not used, and there are also problems such as high processing costs. This resource has not been effectively utilized; however, due to the high cost of beneficiation, medium and low-grade phosphate rocks are likely to cause environmental pollution and other problems. At the same time, the non-beneficiation direct utilization technology of medium and low-grade phosphate rocks is not mature enough to achieve effective industrial applications.

Images