67results about How to "Reduce sodium oxide content" patented technology

The invention relates to a method for recycling alumina and sodium oxide from bayer process red mud. In the method, by adopting a high molecular ratio and high alkali concentration sodium aluminate solution, aluminum extracting reaction can be rapidly carried out under mild operating conditions, so that the recovery rate of alumina in the red mud reaches more than 85%, and the defects, such as equipment scabbing and the like can be effectively prevented and even eliminated; by implementing an efficient crystallization process of an intermediate product of hydrated sodium aluminate, the cycle efficiency of a dissolution medium is greatly improved; due to complete transformation of a phase in the aluminum extracting reaction, a reaction process of recycling sodium oxide can be performed at low temperature and normal pressure; and after secondary sodium removal reaction, the sodium oxide content in final red mud is not more than 1% and is far less than 6-8% of the bayer process red mud. Therefore, the red mud can be doped in large proportion for preparing cement, brick and roadbed materials, concrete additives, environmental remediation materials and other fillers, and the problems such as resource utilization of the red mud, potential environment hazard and the like are hopefully solved.

A method for modifying an in-situ crystallization type catalytic cracking catalyst. The method is to firstly treat the crystallized product of the in-situ crystallization type FCC catalyst with alkali under hydrothermal conditions, then exchange four times with ammonium ions and rare earth ions, and roast twice to obtain the desired catalyst product. . In the alkali treatment, the amount of alkali added is such that the weight ratio of alkali / crystallized product is 0.01-0.15, the reaction temperature is 70-100° C., and the treatment time is 0.1-3 hours. The method does not increase the modification cost of the catalyst, and greatly reduces the amount of ammonium salt used, thereby reducing the burden and investment in the treatment process of ammonia-nitrogen-polluted primary ammonia-nitrogen wastewater. It is an environmental protection technology in catalyst production; the prepared catalyst has relatively high With low sodium oxide content, the pore volume increases, and the catalyst performance remains basically unchanged or improved.

The invention provides a desulfuration adsorbent for a petrochemical engineering process. The adsorbent is an auxiliary taking a self-prepared mesoporous material as a carrier; titanium and vanadium are taken as main active components; a silicon -phosphate-aluminum gel is taken as a binding agent; the doping amount of vanadium based on V2O5 is 2-6%; the doping amount of titanium based on TiO2 is 10-30%. In the preparation process of the adsorbent provided by the invention, the treated smoke dust generated by a petrochemical enterprise is reasonably utilized as a carrier of the desulfuration adsorbent and two metals, namely titanium and vanadium, are simultaneously introduced into the carrier, so that the petrifaction solid wastes are treated, the desulfuration capacity of the desulfuration adsorbent is enhanced and the adsorbent is economical and environmentally friendly.