Recovering gold form arsenic bearing gold mine through floatation has always been an important research subject, the gold ore contains 2.40 g/t of gold and content of arsenic was 1.2% in Hebei, cannot achieve good product indexes, in order to improve the efficiency of resource use, lime was adopted to control the pH value of pulp, NaHSO3 was added to inhibit the arsenic, the floatation of gold was carried out priority. The gold concentrate contain 65.63g/t with the recovery was 89.92% and the content of arsenic was only 0.07% after closed-circuit experiment, that results means the product indexes were improved greatly compare the field product now.

The paper researched on hematite’s characteristic of process mineralogy in Fengyang Anhui province. The chemical compositions of the ore were analyzed. The species, components of the hematite are determined, and the grain size and embedded characteristic of the ore are statistical. Some suggestions are proposed to improve the recovery of Fe2O3 according to the result of the process mineralogy study.

Recovering valuable metal from tailings has always been one of national resource comprehensive utilization key research subjects. There are copper-bearing magnetite which contains 43.31% of iron and 0.21% of copper in some places. After grinding-low intensity magnetic separation-flotation process can get 68.87% of iron concentrate with recovery 64.39% and copper concentrate which contain copper 12.67% with recovery of 75.30%. The experiment results will provide an effective way to comprehensive utilize the resource in one area.

Considered the properties of limonite ore at Jiangxi, the raw ore pressing ball - direct reduction - magnetic separation flowsheet have been adopted. the pressing ball conditions, the influence factors and the grinding magnetic separation conditions experiments were carried out. The results shown that: When the dosage of coal was 20%, water was 10%, CMC was 0.5%, pressing ball under the pressure of 190 kN, the calcination temperature was 1100 °C, the roasting time is 50 min, roasted ore were magnetic separated after grinded to 85% through 200 mesh screen. the iron concentrate grade of 92.48% and recovery rate of 93.45% were achieved finally.

As a novel tubular motor, the merits of transverse flux tubular motor different from other traditional linear motors are as follows: there is no competition between the space requirement of flux carrying core irons and the space occupied by armature windings. It can increase the force density due to the magnetic load and the electric load are decoupled. Transverse flux tubular motor seems to be suitable for some fields requiring high force density. This paper investigates the stator core loss of transverse flux tubular motor. The influences on the stator core loss are analyzed in detail, including the speed, load current, and the lead-lag control load current. Besides, the calculation of core loss in a variable speed reciprocating periodic motion mode is given the special attention. It is proposed a method of calculating the variable speed reciprocating periodic motion of the stator core loss in this paper. In order to verify the accuracy of calculation, the core loss measurement is designed and the comparison results are analyzed.