China University of Geosciences (Wuhan)

Luru Jing

Chunjie Yan

Tao Chen

Zhenhua Wang

Yuting Chen

Chen Liu

Tian Liang

Sen Zhou

Yixia Wang

Youfa Zhu

Yonghan Zhang

Xujian Li

A method for recycling rare earth from a wastewater from rare earth mining or from rare earth smelting, includes the steps of: removing oil from the wastewater to obtain a degreased wastewater; purifying the degreased wastewater to obtain a purified wastewater using a pretreatment system; recycling rare earth from the purified wastewater to obtain a rare earth slurry and a low rare earth wastewater using a rare earth recycling tank; treating the low rare earth wastewater to obtain ammonia gas using an ammonium degassing device; and converting the ammonia gas to obtain aqueous ammonia using an aqueous ammonium preparing system.

System and method for recycling rare earth and ammonia nitrogen from rare earth wastewater

A method for preparing an ultra-light-weight (ULW) proppant usable in the oil and gas industry. The method uses silane coupling agent and organic acid to modify silica fume (SF) to obtain modified SF that is lipophilic and hydrophobic. The modified SF is used as inorganic phase, and the polymerizable monomer is used as organic phase, and the organic-inorganic composite microspheres are obtained through suspension polymerization. The ULW proppant is obtained by drying, screening, and pre-oxidization of the composite microsphere. The ULW proppant has a density of about 1.109 g/cm-1.278 g/cm, which is close to that of water, a crushing rate of &#x3c;5% at 52 Mpa, and a crushing rate of &#x3c;7% at 69 Mpa. In the oil and gas industry application, water or salt water can be used to replace the high viscose guanidine gum as carrier, thus reduced cost of fracturing, and reduced environment pollution.

Method for preparing ultra-light-weight (ULW) proppant applied on oil and gas wells

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Hubei, China

Luru Jing