题干

废旧锂离子电池的正极材料试样(主要含有LiCoO2及少量Al、Fe等)可通过下列实验方法回收钴、锂.

(1)在上述溶解过程中,S2O32ˉ被氧化成SO42ˉ,LiCoO2在溶解过程中反应的离子方程式为 ____ .

沉淀物

开始沉淀pH

沉淀完全pH

Al(OH)3

3.0

5.2

Fe(OH)3

1.5

2.8

Fe(OH)2

7.6

9.7

(2)除杂时通入空气的目的____ ,所得的废渣成分为____ .从废渣中获得Al2O3的部分流程如图甲所示,括号表示加入的试剂,方框表示所得到的物质.则步骤I需要的玻璃仪器有____ ,步骤Ⅱ中反应的离子方程式是

____ 

(3)工业上,将Li2CO3粗品制备成高纯Li2CO3的部分工艺如图乙.

a.将Li2CO3溶于盐酸作电解槽的阳极液,LiOH溶液作阴极液,两者用离子选择透过膜隔开,用惰性电极电解.

b.电解后向LiOH溶液中加入过量NH4HCO3溶液,过滤、烘干得高纯Li2CO3

①a中,阴极的电极反应式是 ____ .

②b中,生成Li2CO3反应的化学方程式是 ____ .

上一题 下一题 0.0难度 选择题 更新时间:2018-03-21 09:24:43

答案(点此获取答案解析)

S2O32\u02c9+8LiCoO2+22H+\u25502SO42\u02c9+8Li++8Co2++11H2O,\u5c06Fe2+\u6c27\u5316\u6210Fe3+,Fe\uff08OH\uf

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How to Age Well

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Lose just a little bit of weight.

    Small changes in body weight can have a big impact on health risks.____While we'd love to lose our extra pounds, it's easier to start with a 5 percent weight loss goal and keep on.

Avoid processed meat.

    ____A number of studies have found associations between eating a lot of processed meats and poor health. Other research has implicated processed meats in a higher risk for cancer. But there was no increase in risk associated with eating unprocessed red meat.

____

    The best eating strategy for aging well is to skip processed foods and drinks. That will immediately reduce added sugars from your diet. Once you cut out packaged foods, you will start eating a lot more fruits and vegetables, lean meats and fish and whole grains.____

    Meanwhile, invest in a new pair of walking shoes, a gym membership or a delicious healthy meal with your family and oilier loved ones. All of those are likely to do much for your emotional and physical health.

A. Skip packaged foods.

B. Save the money you would spend on rich food.

C. And the good news is that it's never too late to get started.

D. This has been shown in numerous studies to be good for you.

E. There's some evidence that vitamin B12 is good for the aging brain.

F. Losing just 5 percent of your body weight has been shown to reduce your risk for diabetes and heart disease.

G. Processed meals like hot dogs and sausages have been salted, cured or smoked to improve preservation.