33 results about "Iron increased" patented technology

A bearing is manufactured by filling iron-based material powder and copper-based material powder in a filling portion of a mold, compacting those material powder so as to form a green compact, and then sintering the green compact. The copper-based material powder contains flat powder particles, the flat powder particles having a large aspect ratio than particles of the iron-based material powder. The coppers-based powder particles segregate on a sliding surface by vibration. The sliding surface of a bearing is covered with copper, and a ratio of iron increases from the sliding surface toward the inside. Since a rotation shaft slides on the sliding surface covered with copper, a frictional coefficient between the rotation shaft and the sliding surface is reduced, thus enabling a smooth rotation thereof. Simultaneously the usage of iron imparts predetermined strength and durability.

The invention provides a method for controlling the ferrous oxide (FeO) content in a sintering ore. In the method, the sintering ore comprises the following raw materials: titanium-containing iron ore powder, fuel, a flux and blast furnace dust; and a value in formula 1 is controlled within 2.8wt%-2.9wt% so as to control the ferrous oxide content in the sintering ore within 7.2wt%-8.2wt%, wherein, the formula 1 is as follows: (FC) mixture=[Wfuel*(1-Afuel-Vfuel-Sfuel-Hfuel)+R(blast furnace dust)*Wnew material*C(blast furnace dust)] / Wmixture*100%. The method of the invention can control the FeOcontent in the sintering ore accurately and stably to obtain the sintering ore with excellent reducibility and intensity, thus further promoting iron increase and coke reduction during the blast-furnace smelting process, lowering the iron-making cost, reducing the coke powder usage during the sintering process, lowering the solid fuel consumption and saving the cost while realizing recovery and reuse of the blast furnace dust.

The invention particularly relates to a dephosphorization and iron-increasing method of high phosphorus hematite by direct reduction, and the technical scheme comprises the following steps: mixing 60-83wt% of high phosphorus hematite powder, 10-15wt% of carbonaceous reducing agent, 6-15wt% of quicklime and 1-10wt% of additive uniformly, pressing the mixture into blocks, drying, reducing in a hightemperature furnace under 1250-1350 DEG C, and keeping the temperature for 15-30 minutes; carrying out furnace cooling until the temperature is 600-800 DEG C, taking the reduction product out, naturally cooling, grinding and performing the magnetic separation to obtain pig iron particles. The additive is sodium carbonate, or potassium carbonate, or the mixture of the sodium carbonate and the potassium carbonate; drying is carried out under the condition of 110-120 DEG C until the weight of the mixture of raw materials is constant; and the high temperature furnace is a resistance furnace, or arotary kiln, or a rotary hearth furnace, and the atmosphere in the high temperature furnace is neutral or weak-reductive. The invention has the advantages of short reduction time, simple process, high dephosphorization rate, high iron yield, less environmental pollution, recyclable residue and the like.

The invention discloses a refining agent adding device and adding method, which belong to the technical field of alloy smelting and solve the problems of iron increase or poor refining effect in the refining process in the prior art. The adding device of the present invention includes a storage tank, a stirring mechanism and a lifting mechanism for driving the storage tank and the stirring mechanism to lift up and down. The storage tank is provided with a through hole with the notch facing downward, and the storage tank is filled with refining agent. The adding method of the present invention comprises the following steps: start the lifting mechanism, the lifting mechanism drives the storage tank and the stirring mechanism to move towards the direction close to the molten pool, and enter the molten pool, close to the bottom of the molten pool; close the lifting mechanism, open the stirring mechanism, and Under the action of stirring, the refining agent in the storage tank is taken out of the storage tank and dissolved in the melt, thereby completing the addition of the refining agent. The adding device and adding method of the present invention can be used for adding refining agent.

The invention discloses a dephosphorization iron-increasing method for high-phosphorus iron ore. The method comprises the following steps that 1, reduction coal is treated to be modified reduction coal powder, wherein a CaCl2 saturate water solution is sprayed to the surface of the reduction coal, the reduction coal is dried and ground, and the modified reduction coal powder is obtained; 2, high-phosphorous iron ore is treated to be modified high-phosphorous iron ore powder, wherein a NaCO3 saturate water solution is sprayed to the surface of the high-phosphorous iron ore, the high-phosphorous iron ore is dried and ground, and modified high-phosphorous iron ore powder is obtained; 3, the modified reduction coal powder and the modified high-phosphorous iron ore powder are mixed to be uniform to be prepared into pellets and dried; 4, the dried pellets are cooled after being roasted to obtain iron beads. The dephosphorization iron-increasing method for the high-phosphorus iron ore has the advantages of being short in flow and good in dephosphorization effect, and is of great significance in effectively improving high-phosphorus iron ore and solving the problem of lack of ore resources.

The invention discloses an iron-increasing and silicon-reducing reselection technique for mixed-type lean iron ore tailings, comprising the following steps of: strong magnetic roughing: putting mixed-type lean iron ore tailings through a strong magnetic separator with the magnetic field intensity of 5000-10000 Oersteds to obtain roughed concentrate and roughed tailings; strong magnetic cleaning: selecting the roughed concentrate in the strong magnetic separator with the magnetic field intensity of 10000-20000 Oersteds to obtain magnetic concentrate and magnetic tailings; centrifugal selecting: putting the magnetic concentrate in a centrifugal concentrating machine with the rotating speed of 150-250r / min to obtain centrifugal concentrate and centrifugal tailings; and table selecting: selecting the centrifugal tailings through a table with the stroke of 8-10mm and the frequency of stroke of 250-300 times / min to obtain table concentrate and table tailings. According to the iron-increasing and silicon-reducing reselection technique, a great quantity of tailings is dropped through rough and concentrate double magnetic selection; the magnetic concentrate is selected by using the centrifugal machine so that irons are increased and silicon is reduced; and then the centrifugal tailings are selected by using the table so that the productivity is increased. The iron-increasing and silicon-reducing reselection technique has the effects of realizing iron increment and silicon reduction of the mixed-type lean iron ore tailings, incrasing the productivity of the iron ore to a great extent at the same time and providing an effective approach to iron increment and silicon reduction of the reselected concentrate for the mixed-type lean iron ore tailings.

The invention discloses a combined use method of an iron ore anion reverse flotation desulfurizing and silicon reducing agent, which comprises the following steps: obtaining iron ore rough concentrates through magnetic selection or magnetogravity combined selection of iron ores achieving base unit dissociation through fine grinding, and adopting anion reverse flotation for the desulfurization andsilicon reduction of the obtained rough concentrates, wherein the agent comprises the components in the following types and dosages (computed according to the flotation feeding dry basis): 80-100g / t of ethyl xanthate, 950-1150g / t of NaOH, 450-600g / t of starch, 320-420g / t of CaO and 600-750g / t of anion reverse flotation collector. The method can remove sulfur as a detrimental impurity in the iron ore concentrates while extracting iron and reducing silicon of the iron ores without considering the influence of numerous foams generated by an oil foamer on an iron separation process, lowers the medicament cost, simplifies the process flow, is easy to implement in production, can be widely used for the iron increase, desulfurization and silicon reduction of magnetite separation plants and hematite separation plants, and can also be used for the desulfurizing and silicon reducing flotation of limonite, martite and semi-martite.

The invention relates to a chloridizing segregation-low-intensity magnetic separation method for reducing phosphorus of a high phosphorus iron ore. A chloridizing segregation-low intensity magnetic separation process is adopted to realize iron increase and phosphorous reduction in the method. A chlorinating agent and a reducing agent coke are added to the high phosphorus iron ore and mixed evenly, then chloridizing segregation roasting is carried out in a roasting furnace; the roasted product is water quenched and ball milled, and then separated by a low-intensity magnetic field magnetic separator, thus being capable of obtaining an iron ore concentrate with the iron grade more than 80%, the iron recovery rate more than 85% and the phosphorous content less than 0.20%. The iron ore concentrate powder can be taken as a raw material for smelting pig iron after being pelletized. Additionally, with regard to high phosphorus iron ores which contain sulfur or contain sulfur and arsenic at the same time, such as hematite, hematite-limonite ore, oolitic hematite-limonite ore, hematite, siderite and the like, the product iron ore concentrate with the sulfur content less than 0.20% and the arsenic content less than 0.04% can also be obtained.