Poverty Decentralization or Reconcentration: An Empirical Study of the Effects of Collected Public Rental Housing in Changzhou, Jiangsu Province

Based on the supply-side reform objective, it is a great transformation of housing welfare measures in China to collect private unoccupied houses as public rental housing instead of building new ones. Through an empirical study of the Collecting Houses as Public Rental Housing Program in Changzhou, this paper finds that the collected houses is relatively scattered in the city, which is beneficial to avoiding over-centralization and marginalization of the poor families. However, it has resulted in poverty reconcentration in some old communities, probably further leading to spatial solidification of the poor as well as a further decline of old communities. Therefore it may not effectively solve the housing problems of the poor population by providing this alternative public rental housing, which is collected according to economic efficiency. Accordingly, the paper argues that it is necessary to reinforce community development and to renovate the declined communities in time, as an important supplement to housing welfare improvement.

Purification of specularite by centrifugation instead of flotation to produce iron oxide red pigment

This study used specularite, a high-gradient magnetic separation concentrate, as a raw material in reverse flotation.An iron concentrate with a grade of 65.1 wt% and a recovery rate of 75.31% were obtained.A centrifugal concentrator served as the deep purification equipment for the preparation of iron oxide red pigments, and its optimal rotating drum speed, feed concentration, and other conditions were determined.Under optimal conditions, a high-purity iron oxide concentrate with a grade of 69.38 wt% and a recovery rate of 80.89% were obtained and used as a raw material for preparing iron oxide red pigment.Calcining with sulfuric acid produced iron red pigments with different hues.Simultaneously, middlings with a grade of 60.20 wt% and a recovery rate of 17.51% were obtained and could be used in blast furnace ironmaking.High-value utilization of specularite beneficiation products was thus achieved.

Impact energy analysis of turbulent water sprays for continuous centrifugal concentration

A SLon full-scale continuous centrifugal concentrator was used to reconcentrate hematite from a high gradient magnetic separation concentrate to study the effect of impact angle, concentrate mass and drum rotation speed on the impact energy of turbulent water sprays for continuous centrifugal concentration, under conditions of feed volume flow rate around 9 m3/h, feed solid concentration of 25%-35% and reciprocating velocity of water sprays at 0.05 m/s. The results indicate that a minimal critical impact energy is required in the water sprays for achieving continuous concentration of the concentrator; an unfitted impact angle reduces the impact efficiency, and the highest impact efficiency of 0.6416 is found at the mpact angle of 60°; the increase in concentrate mass leads to an increase in impact energy, and the highest impact efficiency is maintained when the concentrate mass varies in the range of 0.44-0.59 kg/s; when the concentrate mass and the pressure of water sprays are kept at around 0.45 kg/s and in the range of 0.4-0.6 MPa respectively, the impact energy increases proportionally with the increase of drum rotation speed.