Beneficiation method for high-phosphor oolitic hematite

Abstract

The invention relates to a beneficiation method for high-phosphor oolitic hematite. The beneficiation method is characterized in that reverse-flotation dephosphorization is carried out by use of a mixed collector which consists of a cationic collector, namely dodecyloxy propyl ether amine, an anionic collector, namely oleic acid, and an emulsifier, namely tween-20 in proportion, wherein after ore-grinding, mixing and size-mixing, once rough concentrationroughing and three-time scavenging are carried out to abandon tailings; rough concentration bottom flow and bottom flow obtained by primary scavenging are combined and six-time concentration is carried out; bottom flow obtained by the last three times of concentration is subjected to centralized concentration and scavenging to abandon the tailings; foams obtained by secondary scavenging and tertiary scavenging are returned to last operation; bottom flow obtained by primary concentration and scavenging and bottom flow obtained by tertiary concentration are combined, and four-time concentration, five-time concentration and six-time concentration are carried out; foams obtained by secondary concentration and scavenging and tertiary concentration and scavenging are returned to the last operation; the mixed collector is good in selectivity, the foams are high in quality, and the tailings are abandoned twice in the flotation process, so that the return pressure of the process is reduced, the problem that foams, due to a large quantity, cannot be smoothly returned in an oxidized ore flotation process is solved, and therefore, the process is smooth, the phosphor content in the iron ore concentrate can be effectively reduced, and the qualified iron ore concentrates which meet industrial application are obtained.

Description

technical field [0001] The invention relates to the field of beneficiation of oolitic hematite, in particular to a method for separating high-phosphorus 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, and it is often symbiotic or wrapped with siderite, oolitic chlorite and phosphorus-containing minerals. Especially high-phosphorus oolitic iron ore (phosphorus content above 0.5% (weight)), in the process of ironmaking and steelmaking, phosphorus enters the metal, making the steel brittle when it is cooled, seriously affecting the quality of pig iron and steel . Therefore, dephosphorization of high-phosphorus iron ore is a technical problem that needs to be solved urgently at home and abroad. [0003] For phosphorus-containing iron ores with different properties, the phosphorus reduction methods that have been proposed at thi...

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Problems solved by technology

[0003] For phosphorus-containing iron ores with different properties, the phosphorus reduction methods that have been proposed at this stage mainly include magnetic separation, composite agglomeration separation, microbial methods, smelting methods, and chemical methods. However, most of these methods have complex processes and high costs. , low dephosphorization rate, environmental pollution and other reasons, its application is limited

In particular, the chemical dephosphorization method usually uses nitric acid, hydrochloric acid or sulfuric acid to carry out acid leaching dephosphorization of ores. Although this method has a good dephosphorization effect, the traditional chemical dephosphorization method consumes a lot of acid, has high costs, and is harmful to the environment. And it is easy to cause the soluble iron minerals in the ore to be dissolved, resulting in the loss of iron

[0004] Invention patent application (publication (announcement) No. 102974446A) discloses a "Oolitic hematite beneficiation method", by adding a slime dispersant in the grinding step, the slime dispersant is mixed with minerals during the grinding process. The particles are mixed very fully and evenly, and can quickly exert the effect of inhibiting particle agglomeration during the pulping process; although this invention can overcome the defect that it takes a long time to stir after grinding in the prior art to ensure the dispersion efficiency, it has achieved good separation efficiency. It can improve the grade of iron and reduce the content of elemental phosphorus and silicon, and obtain iron ore that meets the requirements of the smelting process. A single anion collector has poor selectivity, and the quality of foam produced by flotation is not high. During production, the amount of foam will be too large to return to the closed circuit. In addition, magnetic separation is required in the beneficiation process, which is complex and costly

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