8results about How to "Lower iron levels" patented technology

The present disclosure relates to the technical field of sodium ion battery negative electrode materials, in particular to a preparation and purification process of a biomass hard carbon material for sodium ion battery negative electrodes and application. The preparation and purification process comprises the following steps: providing biomass carbonization material, preparing a first mixed acid solution comprising nitric acid, hydrochloric acid and hydrofluoric acid, and performing first acid washing; then preparing a second mixed acid solution comprising organic acid, chelating agent and surfactant; performing second acid washing; then performing a ball milling process together with the second mixed acid solution; and finally calcining under a nitrogen atmosphere to obtain a biomass hard carbon material for sodium ion battery negative electrodes.

The invention discloses a secondary aluminum iron removal method, and belongs to the technical field of secondary aluminum iron removal, and the method comprises the following steps: adding a refining agent, an Al-3B alloy and an Al-10Sn alloy to act on a secondary aluminum alloy melt, removing impurity elements Fe, B and Sn to promote a Fe-rich phase to settle, so that the Fe-rich phase in secondary aluminum is mainly gathered at the bottom, and then cutting off the bottom. According to the method, the refining agent, the Al-3B alloy and the Al-10Sn alloy are added into the regenerated aluminum melt, so that a Fe-rich phase can be settled to the bottom of the melt, the iron removal effect is achieved, and the highest iron removal rate can reach 44.51%.

The utility model discloses a kind of magnetic separation slag removal tank, including box, the inside of the box is cavity structure, the upper end of the box is provided with powder inlet, the lower end of the box is provided with powder outlet, the inside of the box is equipped with multiple strong magnetic rods, the strong magnetic rod is along the inside diagonal direction of box inclination and equidistant arrangement, the front, rear position in the box is fixed with support, the support is along the inside diagonal direction of box inclination arrangement, the support is uniformly distributed with placing groove along its length direction, long shaft is transversely placed between the placing groove of the front, rear two supports, the strong magnetic rod is fixed on the outer side of long shaft, and the present magnetic separation slag removal tank can greatly reduce the iron content in aluminium oxide powder, ensure the production quality of raw aluminium.

The invention discloses application of a rice iron deficiency tolerance gene OsIDT1 (Oryza sativa L. iron deficiency tolerance gene 1). The sequence of the iron-deficiency tolerance gene OsIDT1 is as shown in SEQ ID NO. 1. The gene can be applied in multiple aspects of promoting the iron element to be transferred from mature tissues to new tissues, improving the iron utilization efficiency of the rice and the like. The biological function of the iron-deficiency tolerance gene OsIDT1 in rice is found through a large number of experiments, and the iron element can be prevented from being transferred from a mature tissue to a new tissue by knocking out the gene, so that the iron utilization efficiency, the yield, the grain iron content and the like of the rice are reduced; the over-expression of the gene can promote the iron element to be transferred from mature tissues to new tissues, so that the iron utilization efficiency, the yield, the grain iron content and the like of the rice are improved.

A kind of process method for recovering iron and zinc from iron-zinc-containing sludge, which is carried out in the following steps: roasting the iron-zinc-containing sludge at 600-800 ℃ in an oxidizing environment, Zn(OH)2 is decomposed into ZnO, and Fe(OH)3 is decomposed into Fe2O3, obtaining an oxidized roasting product; reducing roasting 1 of the oxidized roasting product at 500-700 ℃, obtaining a reduced roasting product; grinding the reduced roasting product to a content of 65%-85% of -0.025 mm; weak magnetic roughing and cleaning of the ground product at a magnetic intensity of 79.62-131.34 kA / m, obtaining a final concentrate with an iron grade of more than 55%; and reducing roasting 2 of the tailings with coke as a reducing agent at 1100-1200 ℃, distillation to obtain elemental zinc, with a zinc recovery rate of more than 90%, a zinc content in the roasting slag of less than 0.5%, and the roasting slag being treated as waste slag. The method is used for treating iron-zinc-containing sludge obtained by chemical precipitation of electroplating zinc wastewater, and recovers iron and zinc by combined beneficiation and smelting, reduces the content of heavy metals in the iron-zinc-containing sludge, recovers valuable metals, solves the problem of environmental pollution, and provides a zinc recovery method for solid waste resources.

The application discloses a pre-treatment method of carbon baking filler for aluminum, aiming at controlling the migration and accumulation of iron impurities from the filler, comprising the following steps: S1, screening the filler to be treated according to the particle size, and separating the filler into at least two different particle size intervals, wherein the particle size of the filler in at least one particle size interval is less than 2 mm; S2, performing air separation purification on the filler with a particle size less than 2 mm to remove iron-containing particles; S3, sequentially performing weak magnetic separation treatment and strong magnetic separation treatment on the filler in each particle size interval obtained in the step S1 to remove iron-containing impurities; S4, performing acid treatment on the filler after the air separation purification and the magnetic separation treatment to remove an iron oxide film attached to the surface of the filler particles; and S5, uniformly mixing the filler in each particle size interval after the treatment according to the original mass proportion before the screening.

This invention discloses a method for the resource recovery and full utilization of Bayer process red mud. First, the red mud undergoes a hydrogen-based mineral phase conversion, causing thermal cracking. Then, iron is recovered from the red mud through magnetic separation. The magnetic separation tailings are leached with phosphoric acid to extract valuable metals, effectively improving the recovery of valuable metals from the red mud while minimizing equipment corrosion. The leaching tailings, due to the decomposition and removal of alkaline components and the formation of phosphates during the leaching process, can be used as a raw material for the production of slow-release mineral fertilizers. The method described in this invention enables the full recovery of valuable metals such as iron, aluminum, and gallium from Bayer process red mud, and allows the leaching residue to be fully utilized in the production of mineral fertilizers. Therefore, this invention, focusing on the resource recovery and full utilization of Bayer process red mud, is of great significance for improving resource security and the treatment of large-scale solid waste, and has promising application prospects.

This invention belongs to the field of metallurgical solid waste resource utilization technology, specifically disclosing a method for the comprehensive recovery of copper and iron from copper slag flotation tailings. The method involves magnetic roughing and magnetic scavenging of the copper slag flotation tailings, merging them to obtain a mixed magnetic concentrate; the mixed magnetic concentrate is regrinded to a final density of -0.038 mm (80%–95%); the regrinded product enters the flotation system, using a combination of dimethyl sulfoxide and dispersant red at a mass ratio of 1:6–8 as collectors, and undergoes two roughing, two cleaning, and two scavenging processes to obtain copper concentrate; the copper-removed tailings from the flotation process undergo two roughing and three cleaning magnetic separations to obtain iron concentrate; the middlings from the three cleaning stages are combined with the magnetic scavenging tailings to form the final tailings. This invention processes copper slag flotation tailings with a copper grade of 0.22%–0.31% and an iron grade of 40%–45%, yielding copper concentrate with a copper grade of 6.8%–8.1% and a recovery rate of 43%–48%, and iron concentrate with an iron grade of 54%–60% and a recovery rate of 69%–79%. This invention eliminates the need for roasting, achieves co-recovery of copper and iron, and features a compact process, strong reagent selectivity, and stable performance indicators.