阅读说明：本技术 一种次生铁矿石中的铁回收工艺 (process for recovering iron in secondary iron ore ) 是由 刘允辉 于 2018-05-28 设计创作，主要内容包括：一种次生铁矿石中的铁回收工艺,包括如下步骤：将混合均匀的次生铁矿石和含碳还原剂煤粉放入坩埚中,将坩埚置于温度1200～1300℃的马弗炉内深度还原焙烧120～180min；迅速取出还原物料进行水淬,并冷却至室温；将冷却后的还原物料进行磨矿,磨矿产品进行磁选,所得磁选精矿即为最终产品。本发明获得产品的主要成分是金属铁,金属化率在95％以上、铁品位与铁回收率均在92％以上。本方法为次生铁矿矿石的高效开发与利用提供了新的途径。(A process for recovering iron in secondary iron ores comprises the following steps: putting the uniformly mixed secondary iron ore and carbonaceous reducing agent coal powder into a crucible, and deeply reducing and roasting the crucible in a muffle furnace at the temperature of 1200-1300 ℃ for 120-180 min; quickly taking out the reduced material to carry out water quenching, and cooling to room temperature; and grinding the cooled reduced material, and carrying out magnetic separation on the ground ore product to obtain magnetic concentrate, namely the final product. The main component of the product obtained by the invention is metallic iron, the metallization rate is more than 95%, and the iron grade and the iron recovery rate are both more than 92%. The method provides a new way for the efficient development and utilization of secondary iron ore.)

1. the process for recovering iron in secondary iron ores is characterized by comprising the following steps of:

(1) Crushing: crushing the ore to iron sand smaller than 2mm by using a crusher;

(2) mixing materials: uniformly mixing iron sand obtained by crushing the secondary iron ore and coal dust containing a carbon reducing agent, wherein the using amount of the coal dust is 80-100% of the weight of the secondary iron ore;

(3) deep reduction roasting: placing the material obtained in the step (2) into a crucible, placing the crucible into a roasting furnace, roasting at 1200-1300 ℃ for 120-180 min, and carrying out deep reduction roasting to obtain roasted sand;

(4) water quenching: quickly taking out the calcine obtained in the step (3), performing water quenching, and cooling to room temperature;

(5) Grinding: putting the calcine obtained in the step (4) and cooled to room temperature into a mill for milling, so that the fineness of a milled product-325 meshes accounts for more than 95%;

(6) Magnetic separation: and (5) carrying out magnetic separation on the ground ore product obtained in the step (5), wherein the magnetic field intensity is 60-75 kA/m, and the obtained magnetic concentrate is the final product.

2. the method for recovering iron from a secondary iron ore according to claim 1, wherein: the roasting furnace is a muffle furnace.

Technical Field

The invention belongs to the technical field of mineral processing, and particularly relates to a process for recovering iron in secondary iron ore.

Background

secondary iron ore generally refers to the formation of deposits of various metal sulfide deposits, after undergoing relatively thorough oxidation, weathering, leaching, of oxides, mainly iron, manganese, calcium, silicon, aluminum, etc., hydrous oxides, secondary sulfates, various alums, and clay mixtures, which are generally distributed in the upper or near-by regions of the primary sulfide deposits. The secondary iron ore generally contains high iron, and mainly contains limonite. Limonite also belongs to one of refractory iron ores. The reserves of limonite in China are up to 12.3 hundred million tons, which account for 2.3 percent of the reserves of iron ore in China. Limonite ores generally contain 35 to 40 percent of iron, and sometimes can reach 50 percent. Typical limonite beneficiation processes are: the method comprises a single gravity separation process, a single wet-type strong magnetic separation process, a single flotation process and combined process flows of strong magnetic separation, positive flotation, strong magnetic separation, amine reverse flotation, reduction roasting, magnetic separation, leaching and the like. The research on refractory iron ores is more at home and abroad, but the research on the recovery of iron in secondary iron ores cannot see related reports. Therefore, the development and research of a new technology and a new process for recovering iron in the secondary iron ore have important significance.

disclosure of Invention

the invention aims to provide a process for recovering iron in secondary iron ore, which solves the problem of valuable resource waste and realizes effective recycling of the secondary iron ore resource.

The invention adopts the following technical scheme to realize the purpose, and the process for recovering iron in the secondary iron ore comprises the following steps:

(1) crushing: crushing the ore to iron sand smaller than 2mm by using a crusher;

(2) Mixing materials: uniformly mixing iron sand obtained by crushing the secondary iron ore and coal dust containing a carbon reducing agent, wherein the using amount of the coal dust is 80-100% of the weight of the secondary iron ore;

(3) Deep reduction roasting: placing the material obtained in the step (2) into a crucible, placing the crucible into a roasting furnace, roasting at 1200-1300 ℃ for 120-180 min, and carrying out deep reduction roasting to obtain roasted sand;

(4) water quenching: quickly taking out the calcine obtained in the step (3), performing water quenching, and cooling to room temperature;

(5) Grinding: putting the calcine obtained in the step (4) and cooled to room temperature into a mill for milling, so that the fineness of a milled product-325 meshes accounts for more than 95%;

(6) Magnetic separation: carrying out magnetic separation on the ground ore product obtained in the step (5), wherein the magnetic field intensity is 60-75 kA/m, and the obtained magnetic concentrate is a final product;

The roasting furnace is a muffle furnace.

The invention has the outstanding advantages that:

1. the process flow is simple and reliable, and the operation is convenient.

2. The main component of the obtained product is metallic iron, the metallization rate reaches more than 95%, and the iron grade and the iron recovery rate are both more than 92%.

Detailed Description