氧化铝

Of the late two years,in order to find out a kind of dental implant ing materialwhich would possess both the very good properties of biological compatibility,the chemical compatibility and the mechanical compatibility,an animal experi-mental preselection was accomplished by our research team with six kinds of im-planting material chosen from four main sorts of oral implant ing material(met-al,ceramic,high polymer and carbon),As the result of the Preselection,thematerial……bio-ceramic was chosen by ...

为了寻求生物相容性、化学相容性和力学相容性均好的种植材料，在口腔四大类种植材料(金属、陶瓷、碳素、高分子)中，选用6种材料作了动物实验预选。根据预选结果，选定以生物陶瓷为主攻方向，从而研制成功锆磷灰石陶瓷，以之进行了理化性能、生物学性能、及动物实验考查，合平种植要求。并以考查结果与钛合金、多晶氧化铝、单晶氧化铝、钛合金喷涂氧化铝、低温各向同性碳、聚砜种植作了比较，主要性能均较其它几种比较材料为优。经临床初试，锆磷灰石陶瓷的种植效果也较好，其界面为骨性结合。

The article mainly introduced the type of abradant, production methods, production technics and especially introduced two kinds of abradant, the common aluminum hydroxide by sintering process and spherical aluminum hydroxide with sodium aluminate and carbon dioxide.

主要介绍了牙膏磨擦剂的种类、各类牙膏磨擦剂的生产方法和生产工艺，并重点介绍了两种氢氧化铝牙膏磨擦剂，即以烧结法工艺生产的普通氢氧化铝颗粒和由铝酸钠溶液和二氧化碳气体制备的球形氢氧化铝牙膏磨擦剂，并给出了两种氢氧化铝牙膏磨擦剂的工艺流程图、电镜分析图谱、物化性能和工艺指标。

In the process of producing Alumina, the technical process of transforming the aluminum hydroxide into Alumina by heating is called baking.

在氧化铝的生产过程中，将氢氧化铝通过加热转变为氧化铝的工艺过程称为焙烧。

The leaching rate of alumina is over 88%, and the alkali leaching filter liquor can be used to prepare aluminum hydroxide and alumina.

氧化铝的溶出率大于88%，碱浸滤液为高苛性比铝酸钠溶液，可用于制取氢氧化铝和氧化铝产品。

This article reviews the 200kA aluminum cell uses different aluminum oxide in different periods.

结合200kA铝电解槽在使用不同性能氧化铝期间产生的影响，从理论上、实践上对中间状氧化铝与砂状氧化铝的性能进行对比分析。

Catalysts are made by impregnating a porous transition alumina support with an aqueous solution of a copper ammine carbonate complex, draining off any excess of the impregnating solution, and then heating the impregnated support to a temperature above 80 DEG C to decompose the complex thereby depositing a basic copper carbonate compound on the surfaces of the pores of the transition alumina support.

用作例如催化剂的铜／氧化铝组合物，通过用碳酸铜氨配合物的水溶液浸渍一种多孔氧化铝载体，排出任何多余的浸渍液，然后加热所浸渍的载体到80℃以上的温度来分解所述配合物，从而在所述过渡型氧化铝载体的气孔表面沉积一种碱式碳酸铜来制备。

The results show that: the fillers of SiO_2 based investment consist of SiO_2,Al_2O_3 and MgO,and the binder is NH_4H_2PO_4;for SiO_2 based investment,the bulk density and the compression strength decrease,the apparent porosity and the thermal expansion increase,when the specimens are heated to 900 ℃;the fil.

结果表明：氧化硅系包埋料的骨料是氧化硅、氧化铝、氧化镁，结合剂为磷酸二氢铵，其900℃煅烧后显气孔率增加，体积密度下降，耐压强度降低，热膨胀增大；氧化铝系包埋料的骨料是氧化铝和氧化镁，结合剂为磷酸二氢铵，其900℃烧后显气孔率增加，体积密度下降，热膨胀变化不大；氧化镁系包埋料的骨料是氧化镁和氧化铝，结合剂是铝酸钙水泥，其900℃烧后耐压强度明显降低，热膨胀明显增大。

A process for treating the sludge generated by alumina sewage treating system incldues such steps as pumping the alumina sewage in sand depositing pool then in depositing pool, mixing the bottom sludge, the sewage from sand-water separator, and the regenerated water from filter to obtain backflush water, heating in desilicating heater, washing the secondary red mud to recover Na2O and Al2O3, anjd returning the washing liquid containing Na2O and Al2O3 back to the flow of production of alumina.

本发明公开了一种氧化铝废水处理系统的污泥处置新工艺，它将氧化铝废水先进入沉砂池中进行沉砂处理后才进入沉淀池中，将虹吸泥机从沉淀池中吸出的底流污泥和砂水分离器分离出的污水以及将部分经过滤器过滤后所得的再生水作为反冲洗水一起通过污泥泵送到脱硅加热器中加热得污泥热水，然后将污泥热水用于二赤泥洗涤沉降，以回收赤泥附着的Na2O和Al2O3，将洗涤赤泥后含有Na2O和Al2O3的洗液送到氧化铝生产流程中重新使用。

Three schemes of dealing with AH wash liq uor of high soda concentration were analyzed and compared. The results show th at when the AH wash liquor of total soda concentration 95.06g/L is transferred d irectly to dilution tank, soda concentration in overflow of the 1st mud washer c ould be lowered by about 6g/L and soda loss in red mud attached liquor could be lo we red by 0.25 kg Na2O per ton of alumina and therefore saving cost of about 549 000 RMB per year; moreover, suspension in AH wash liquor could be re-dissolved in to diluted liquor and it is favor not only to rise pregnant liquor R p andimprove precipitation process, but also to avoid alumina loss cost of about 353?000 RMB per year by the suspension settling into red mud.

分析比较了处理高浓度氢氧化铝洗液的3种方案，结果表明：将全碱浓度为95.06g/L的氢氧化铝洗液直接送到稀释槽，可使赤泥一洗槽溢流浓度降低约6g/L ，每吨氧化铝赤泥附碱损失减小0.25kg氧化钠，每年可节省碱耗费约54.9万元；而且还能将氢氧化铝洗液中的浮游物反溶解进入稀释液，有利于精液 R p(氧化铝与苛性氧化钠的质量比)的提高，同时避免了其进入赤泥而被损失，每年可减少氧化铝损失费约35.3万元。

M is, the higher the strength will be, as well as more even particle distribution. The mechanism of additives as discussed revealed that on the surface of Al_3 particles the oleophilic group of surface active agent will form oil films to bind together fine Al_3 particles closely so as to increase both the particle size and strength.

结果表明，氢氧化铝颗粒在 45～105μm的个数百分数越大，氢氧化铝颗粒分布越均匀，强度就越好；探讨了添加剂的作用机理，即表面活性剂分子的亲油基在氢氧化铝粒子表面形成油层，将氢氧化铝细粒子紧密粘结在一起，使氢氧化铝的粒度与强度增大。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。