Central South University

Hunan University

Hunan Research Institute for Nonferrous Metals

Wei Sun

Yuehua Hu

Xiang Xiong

Jie Li

Yaonan Wang

Li Zhou

Pan Chen

Zhao Wei

Li Wang

Hai Qin

Siyuan Liu

Chenyang Zhang

Haisheng Han

Rong Wang

Jianjun Wang

Honghu Tang

Songyun Deng

Jianyu Zhu

Mingjun Han

Xiangsong Meng

Yalei Wang

Daixiong Chen

Yanhong Dong

Zhiyong Gao

Wanjia Zhang

Jian Cao

Yuhang Yang

Qingpeng Zhang

Ruolin Wang

Mengfei Liu

Wenjihao Hu

Yue Yang

Zhanjin Deng

Zhaoke Chen

Qiaokang Liang

Wenjuan Sun

Bo Hu

Heng Yu

Yi Zeng

Dini Wang

Qiqi Zhou

Lei Sun

Zheng Peng

A collector 2-cyano-N-(substituted carbamoyl)acetamide compound in flotation of calcium-bearing minerals and a highly selective flotation reagent for the calcium-bearing minerals are provided. The highly selective flotation reagent includes the 2-cyano-N-(substituted carbamoyl)acetamide compound and an auxiliary collector. The 2-cyano-N-(substituted carbamoyl)acetamide compound has an excellent effect on flotation separation of the calcium-bearing minerals and a foaming performance. Dosage is further reduced and a flotation performance is improved by compounding the compound with the auxiliary collector. The flotation reagent can preferably separate fluorite from calcite by flotation, efficiently separates the fluorite and the calcite from scheelite under neutral condition (pH is about 7), effectively purifies rough scheelite concentrate and improves grade of scheelite concentrate. Meanwhile, the neutral flotation reduces influence on the environment.

Carbamoyl)acetamide compound in flotation of calcium-bearing minerals

A collaborative-manipulation robotic arm for kitchen waste and a working method thereof are provided. The robotic arm includes: a base, including a transverse first mounting seat and a second mounting seat connected to the first mounting seat and extending downward; a driving mechanism, disposed at an end of the first mounting seat away from the second mounting seat; a front guide claw, an upper end of the front guide claw being connected to the driving mechanism; a fixed blade, disposed on a side of the second mounting seat facing the front guide claw; and a retractable finger, disposed at a lower end on the side of the second mounting seat facing the front guide claw. The fixed blade, the retractable finger, and the second mounting seat form a rear cutting claw.

Collaborative-manipulation robotic arm for kitchen waste and working method thereof

A method for recycling a copper-containing wastewater from a micro-etching is provided, including: modifying a FeS material with a monomer including both carboxyl and sulfhydryl, a crosslinking agent, and a stabilizing and dispersing agent to obtain a FeS-based pH-responsive material CMC-FeS@HS #SiO#COOH, adding the FeS-based pH-responsive material to weakly-acidic copper-containing wastewater from the micro-etching to allow a reaction, and conducting processes such as sulfide precipitation, exchange, adsorption complexation, and flocculation precipitation to finally obtain a precipitate with CuS as a main component. This method makes full use of the pH responsiveness and abundant surface active sites of the FeS-based pH-responsive material, and can control a recovery rate of copper ions in the wastewater at 99.8% or more merely by adjusting a pH value of the copper-containing wastewater from the micro-etching.

Method for recycling copper-containing wastewater from micro-etching

A hydroxamic acid-metal hydroxide coordination complex and preparation and application thereof are disclosed. The hydroxamic acid-metal hydroxide coordination complex is formed by a coordination of hydroxamic acid with divalent or higher valent metal ions under an alkaline condition. The hydroxamic acid-metal hydroxide coordination complex has a strong selectivity and a strong collection ability for metal oxide minerals such as tungsten-containing minerals, ilmenite, rutile, cassiterite, and rare earth. The preparation method is simple and low in costs, and is beneficial to industrialized production.

Hydroximic acid-metal hydroxide coordination complex and preparation and application thereof

A long-term ablation-resistant nitrogen-containing carbide ultra-high temperature ceramic with an ultra-high melting point is prepared as follows: preparing the HfC powder and the HfN powder according to a mass ratio of HfC:HfN=(1-7):1; uniformly mixing the HfC powder and the HfN powder with the carbon powder and the carbon nitride powder to obtain a mixed powder, wherein the amount of the carbon powder and the amount of the carbon nitride powder do not exceed 8.0 wt. % and 5.0 wt. %, respectively, of the mixed powder mass; and performing spark plasma sintering on the mixed powder to produce the ceramic with the ultra-high melting point, a density ≥98%, and a uniform C/N content distribution. The ultra-high temperature ceramic is suitable for ultra-high temperature ablation-resistant protection at ≥3000° C. The ceramic maintains a close to zero ablation rate and a continuously stable oxidation-resistant protective structure after ablation for 300 s.

Long-term ablation-resistant nitrogen-containing carbide ultra-high temperature ceramic with ultra-high melting point and application thereof

Disclosed are a slow-release inhibitor for high-magnesium sulfide mineral flotation and an application thereof, where the inhibitor is a nano colloidal particle of an alkaline earth fluoride such as CaFand BaFor a highly-reactive natural alkaline earth metal mineral powder. When applied to the flotation separation of a high-magnesium sulfide ore, the inhibitor can slowly release F ions to preferentially form a MgFlayer on the magnesium-containing mineral surface, which provides a structure similar to MgFon a surface of oxidized gangue minerals such as magnesium oxide, changing surface electrical property of the magnesium-containing mineral, inhibiting heterogeneous coagulation of magnesium-containing minerals and sulfide ores due to electrostatic attraction and reducing entrainment, enveloping and agglomeration of gangue minerals to efficiently inhibit the flotation of oxidized gangue minerals such as magnesium oxide.

Slow-release inhibitor for high-magnesium sulfide mineral flotation and application thereof

The disclosure relates to mineral processing, and more particularly to a copper(II)-ammonia complex ion sulfidization activator, and its preparation and application. A molar ratio of NHto Cuin the active ingredient of the copper(II)-ammonia complex ion sulfidization activator is 2:1-4:1. The preparation method includes: dropwise adding an ammonia solution to a copper salt solution; and adjusting the mixture to pH 6-7.2 with dilute sulfuric acid to obtain the copper(II)-ammonia complex ion sulfidization activator. During the sulfidization flotation for the copper oxide ore, the copper(II)-ammonia complex ion sulfidization activator is added and mixed uniformly with the ore slurry prior to the introduction of the sulfidizing agent.

Preparation of copper(II)-ammonia complex ion sulfidization activator and sulfidization flotation method for copper oxide ore

A method for preparing a ceramic-modified carbon-carbon composite material. The method includes preparing and thermally treating a carbon fiber preform, and depositing pyrolytic carbon on the carbon fiber preform in a chemical vapor infiltration furnace, to yield a porous carbon-carbon composite material; placing the carbon-carbon composite material deposited with the pyrolytic carbon on a zirconium-titanium powder mixture, and performing a reactive melt infiltration, to yield a carbon-carbon composite material modified by non-stoichiometric zirconium titanium carbide; and placing the carbon-carbon composite material modified by non-stoichiometric zirconium titanium carbide in a powder mixture including carbon, boron carbide, silicon carbide, silicon, and an infiltration enhancer, and performing an embedding method, to form a ceramic-modified carbon-carbon composite material.

Composite material and method for preparing the same

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Hunan, China

Wei Sun