An industrial technology of using sodium hydroxide solution to absorb hydrogen sulfide generated from barium chloride production to produce sodium sulfide was introduced and its feasibility was discussed from technical and economic perspectives respectively：sodium hydroxide solution with 380~420 g/L absorbed hydrogen sulfide in the packed tower，the reaction was end when mass concentration of sodium sulfide was at 330~350 g/L and the absorption rate of hydrogen sulfide reached at 95%~98%.It not only protects the environment，but also creates benefits for enterprises.

<SPAN lang=EN-US>Microcontents of Cl</SPAN><SPAN lang=EN-US><SUP>-</SUP> and SO</SPAN><SPAN lang=EN-US><SUP>2-</SUP></SPAN><?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="True" SourceValue="4" UnitName="in"><SPAN lang=EN-US><SUB>4</SUB> in</SPAN></st1:chmetcnv><SPAN lang=EN-US> boric acid were determined by photoelectricity turbidimetry with acid as medium.The effects of stabilizer selection,acidity of solution,dosage of precipitant,heating time and temperature as well as measuring time on the turbidity of solution were studied.The optimum experiment parameters were confirmed,which simplified the operation process.In the measurements to determine SO<SPAN lang=EN-US><SUP>2-</SUP></SPAN><st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="True" SourceValue="4" UnitName="in"><SPAN lang=EN-US><SUB>4</SUB></SPAN></st1:chmetcnv></SPAN><st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="True" SourceValue="4" UnitName="in"><SPAN lang=EN-US> in</SPAN></st1:chmetcnv><SPAN lang=EN-US> boric acid,stabilizer was glycerine-ethanol (1</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"">∶</SPAN><SPAN lang=EN-US>4 by volume ratio),precipitant was acidic BaCl</SPAN><SPAN lang=EN-US><SUB>2</SUB> solution.The solution was shaken manually to mix well and heated,as a result,the adding sequence of reagents had no effects on results.The detection limit was 0.10 mg/L,relative standard deviation (RSD) was less than 0.03%,recovery rate was 98.85%~103.00%,and measuring time lasted over 40 min.SO<SPAN lang=EN-US><SUP>2-</SUP></SPAN><st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="True" SourceValue="4" UnitName="in"><SPAN lang=EN-US><SUB>4</SUB></SPAN></st1:chmetcnv></SPAN><SPAN lang=EN-US> concentration in the range of 0.33~</SPAN><SPAN lang=EN-US>0.83 mg/L </SPAN><SPAN lang=EN-US>showed a linear relationship with turbidity.In the measurements of chlorine,the stabilizer was glycerine,measuring time held in 40 min,detection limit was 0.03 mg/L,RSD was less than 0.04%,and recovery rate was 102.2%~106.5%.Cl</SPAN><SPAN lang=EN-US><SUP>-</SUP> concentration in the range of 0.10~0.25 mg/L showed a linear relationship with turbidity.Photoelectricity turbidimetry improved the precision and accuracy of the measurements.The method of turbidimetry to determine Cl</SPAN><SPAN lang=EN-US><SUP>-</SUP> and SO<SPAN lang=EN-US><SUP>2-</SUP></SPAN><st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="True" SourceValue="4" UnitName="in"><SPAN lang=EN-US><SUB>4</SUB></SPAN></st1:chmetcnv></SPAN><st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="True" SourceValue="4" UnitName="in"><SPAN lang=EN-US> in</SPAN></st1:chmetcnv><SPAN lang=EN-US> boric acid is simple,reliable,innocuous,and applicable in practice.<BR></SPAN>

SO<SUP>2-</SUP><SUB>4</SUB>,a common anion in inorganic chemical industry,industrial wastewater,mine drainage,surface water,and drinking water,can result in adverse impact on chemical production,environment and human health.Therefore,it has significant practical sense to explore effective and economic methods of removing SO<SUP>2-</SUP><SUB>4</SUB>&nbsp; from water.Currently,there are many methods for removing SO<SUP>2-</SUP><SUB>4</SUB> from water,but the removal of SO<SUP>2-</SUP><SUB>4</SUB> from water in adsorption methods was mainly summarized,including NDS method,lime and PAC method,calcined hydrotalcite adsorption method,pillared montmorillonite adsorption method,goethite adsorption method and ion exchange method.The principle and the characteristics of each method were pointed out.At the same time,further research direction was also proposed.

<SPAN lang=EN-US>MCM-22 zeolite (molecular sieve) was synthesized by dynamic hydrothermal crystallization method with polyethylene glycol 2000(PEG2000) as organic accessory ingredient and with hexamethyleneimine as template.Effect of PEG2000 on the structure,acidity and catalytic performances of MCM-22 molecular sieve has been investigated.From XRD spectrum,adding proper amount of PEG2000 while synthesizing MCM-22,better MCM-22 crystal could be obtained,but the degree of crystallinity decreased slightly.From the results of nitrogen adsorption-desorption analysis,proper amount of PEG2000 changed the distribution of the most probable pore size,which was increased to 0.587 nm from </SPAN><SPAN lang=EN-US>0.556 nm;</SPAN><SPAN lang=EN-US>additionally,the specific pore volume was increased to <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="True" SourceValue=".59" UnitName="cm">0.59 cm</st1:chmetcnv></SPAN><SPAN lang=EN-US><SUP>3</SUP>/g from <st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="True" SourceValue=".35" UnitName="cm">0.35 cm</st1:chmetcnv></SPAN><SPAN lang=EN-US><SUP>3</SUP>/g and BET specific surface area was increased to <st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="True" SourceValue="456" UnitName="m">456 m</st1:chmetcnv></SPAN><SPAN lang=EN-US><SUP>2</SUP>/g from <st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="True" SourceValue="410" UnitName="m">410 m</st1:chmetcnv></SPAN><SPAN lang=EN-US><SUP>2</SUP>/g.Acidity results tested by NH</SPAN><SPAN lang=EN-US><SUB>3</SUB>-TPD showed that by adding appropriate amount of PEG2000 the strong acid intensity was strengthened.Moreover,the synthesized molecular sieve was used as catalyst in alkylation reaction of benzene and propylene.The activity and selectivity of MCM-22 were investigated and results showed that activity of catalyst has been improved greatly,but its initial selectivity to isopropyl benzene was reduced,however,with the reaction proceeds the selectivity to isopropyl benzene increased soon. <BR></SPAN>

Solubility behavior of sodium triphosphate (STPP) with temperature variation was measured by double indicator-titration method and electrometric titration method.The accuracy of the two methods was also evaluated.The evaluation data indicated that the two methods both had good accuracy and their errors were 2.53% and 1.18%,respectively.Compared with double indicator-titration method,electrometric titration method was more accurate.On the other hand,by comparing the solubility data from experiments with those from literature,it was found that the data from this work were larger than those from literature.However,the experimental error broght by the test methods had been ruled out through the evaluation.Therefore,there were two possible reasons,one was that the sample used in the experiment was an industrial product containing pyrophosphate formed during the triphosphate crystallization,and the another was the time of phase equilibration.The solubility data from this work are helpful for the formulation design and actual production of detergents.

With PbNO<SUB>3</SUB> as raw material and K<SUB>2</SUB>S<SUB>2</SUB>O<SUB>8 </SUB>as strong oxidant,lead dioxide nanosheets were successfully synthesized at the first time by low temperature solid-state redox reaction assisted by the anionic surfactant-sodium dodecyl sulfate (SDS) under the alkali condition.In the reaction,the orange PbO precursor was obtained with the solid-state reaction of the Pb (Ⅱ) compound and NaOH at a low temperature,then the PbO was further oxidized to PbO<SUB>2</SUB> under alkali condition by using K<SUB>2</SUB>S<SUB>2</SUB>O<SUB>8</SUB> as oxidant.The introduced surfactant SDS played a key role for controlling the sheet structure of the PbO<SUB>2</SUB> product. In addition,the crystal form and morphology of PbO<SUB>2</SUB> sample were characterized by means of X-ray diffraction (XRD) and transmission electron microscopy (TEM).The result of XRD showed that sample was PbO<SUB>2</SUB>.TEM test result indicated that the prepared PbO<SUB>2</SUB> displayed irregular sheet morphology,and its average size was about 300 nm×200 nm.<BR>

Potassium&nbsp; ion yield which is strongly affected by factors including the raw ore type,water amount,and temperature in the decomposing procedure,is low in the production of potassium chloride with positive flotation technique.On the basis of practical production,with the decomposing procedure as objective,the factors affecting the quality of decomposing products and yield were investigated,and high concentration brine for different raw ores was reused.The results showed:when component of decomposed mother liquid is certain,the larger the ratio of sodium chloride to potassium chloride in raw ore is,the lower the product quality is,the logarithmic relation between them is proposed and the larger the ratio of magnesium chloride to potassium chloride is,the lower the yield is,the relation between them is linear;the yield of K decreases along with the water amount increasing in decomposing procedure;the larger the ratio of magnesium chloride to potassium chloride is,the quicker the yield decreases along with water amount increasing for different raw ores;when high concentration brine was reused,the component of decomposed mother liquid should be controlled differently for different raw ores because they have different ratios of magnesium chloride to potassium chloride and sodium chloride in the case of decomposing completely within 15 min;when water amount is certain,the larger the ratio of magnesium chloride to potassium chloride is,the quicker the yield decreases along with temperature rising for different raw ores.<BR>

<SPAN lang=EN-US>By adopting new techniques,such as continuous vertical kiln carbon-reduction roasting,air isolation cooling,and heat recycling,high-quality manganese sulfate has been produced through the following procedures of grinding,acid-leaching,impurity removing,solid/liquid separation,purification,concentration,and drying etc..Moreover,many good effects,such as high-effective utilization of resources,energy consumption reduction,labor strength decline,production quality improvement,and environment protection have been realized at the same time.Target that the comprehensive utilization rate of low-grade pyrolusite (MnO</SPAN><SPAN lang=EN-US><SUB>2</SUB> mass fraction less than 25%) powder reaches more than 90% was also met.Especially,it has found a new way for high-effectively utilizing low-grade pyrolusite.Many technical problems in the existing manganese sulfate production methods,such as other kiln roasting methods and two-mine acid leaching method,all have been solved.<BR></SPAN>

<FONT face=Verdana>In the existing production of caprolactam，there are some qualitative problems about by-product ammonium sulfate,such as uneven crystal size,bad color and morphology.In order to get better products,the evaporation crystallization process of ammonium sulfate solution obtained by caprolactam synthesis neutralized liquid was studied and optimized systematically .The effects of parameters,such as seeds added,agitation speed,evaporation temperature,and pH of solution,on the crystallization process,product size distribution,and crystal quality were investigated.And the optimal operation conditions of crystallization were determined.The products were improved in terms of crystal size,color,and purity under the optimized operation conditions,which will,give valuable guidance to the industrial process. <BR></FONT>

<P><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; FONT-FAMILY: "Times New Roman"; mso-bidi-font-size: 12.0pt; mso-fareast-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">It is believed that the semiconductor photo-catalysed oxidation technique is the most environmental-friendly deep-oxidation technique.Presently,artificially synthesized photocatalysts difficulty to be applized industrially due to their relatively high cost.However,the low-price and resourceful natural semiconductor minerals excellent photocatalysis performances,because they always contain many kinds of metal ions,which can improve their absorption spectrum.The current research situation of photocatalysis of such natural semiconductor minerals as natural rutil,natural iron oxyhydroxide,natural sphalerite,and natural manganese minerals at home and abroad,was introduced.Furthermore,the future development was prospected.</SPAN></P>

As the main type of the fluorescent powders,rare-earth fluorescent powder with excellent-performance and broad application has mature preparation technology in its industry.It′s mainly used in modern light,traffic light,cars′status indicator,liquid crystal display (LCD) backlight,large-screen display and so on.To get excellent performance of the fluorescent powder,the research of preparation technology is the key process.Introduced various preparation methods of rare earth fluorescent powder at home and abroad,such as high-temperature solid-phase reaction method,soft chemical method,and physical microwave synthesis method etc..The advantages and disadvantages of these methods were also compared,respectively.Finally,the prospect and the development trend for the synthesis of rare earth fluorescent powder were proposed.

<SPAN lang=EN-US>Technology of preparing strontium carbonate by double decomposition from celestite concentrate powder was investigated.Results indicated that the maximal SrSO</SPAN><SPAN lang=EN-US><SUB>4</SUB> conversion rate reached 95.77%,and the average purity of strontium carbonate could reach 99.5% when Na</SPAN><SPAN lang=EN-US><SUB>2</SUB>CO</SPAN><SPAN lang=EN-US><SUB>3</SUB> was used as the converter and NH</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman""></SPAN><SPAN lang=EN-US>3</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"">·</SPAN><SPAN lang=EN-US>H</SPAN><SPAN lang=EN-US><SUB>2</SUB>O-(NH</SPAN><SPAN lang=EN-US><SUB>4</SUB>)</SPAN><SPAN lang=EN-US><SUB>2</SUB>SO</SPAN><SPAN lang=EN-US><SUB>4 </SUB>as buffer solution to adjust pH of reaction system and as inhibitor to inhibit the conversion of Ba</SPAN><SPAN lang=EN-US><SUP>2+</SUP></SPAN><SPAN lang=EN-US>in the system.CO</SPAN><SPAN lang=EN-US><SUP>2-</SUP></SPAN><SPAN lang=EN-US><SUB>3</SUB> was the actual conversion agent in this reaction system.CO<SPAN lang=EN-US><SUP>2-</SUP></SPAN><SPAN lang=EN-US><SUB>3</SUB></SPAN></SPAN><SPAN lang=EN-US> took up the dominate position when pH was higher than 10.5,which favored the conversion of the SrSO</SPAN><SPAN lang=EN-US><SUB>4</SUB>.However,when pH was lowered to 8.5,CO<SPAN lang=EN-US><SUP>2-</SUP></SPAN><SPAN lang=EN-US><SUB>3</SUB></SPAN></SPAN><SPAN lang=EN-US> amount-of-substance fraction in liquor almost decreased to zero and SrSO<SPAN lang=EN-US><SUB>4</SUB></SPAN></SPAN><SPAN lang=EN-US> conversion reaction therefore tended to stop.Experimental results showed that when temperature was </SPAN><?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="True" SourceValue="75" UnitName="℃"><SPAN lang=EN-US>75 </SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"">℃</SPAN></st1:chmetcnv><SPAN lang=EN-US>,</SPAN><SPAN lang=EN-US>Na</SPAN><SPAN lang=EN-US><SUB>2</SUB>CO</SPAN><SPAN lang=EN-US><SUB>3 </SUB>density was 1.2 mol/L,and pH of the solution was kept more than 10.5,it was beneficial to the conversion of the SrSO</SPAN><SPAN lang=EN-US><SUB>4</SUB>.In the experiment,NH</SPAN><SPAN lang=EN-US><SUB>3</SUB></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"">·</SPAN><SPAN lang=EN-US>H</SPAN><SPAN lang=EN-US><SUB>2</SUB>O-(NH</SPAN><SPAN lang=EN-US><SUB>4</SUB>)</SPAN><SPAN lang=EN-US><SUB>2</SUB>SO</SPAN><SPAN lang=EN-US><SUB>4 </SUB>buffer solution has the promoter action to reaction.<BR></SPAN>

A sulfur reclaiming method from zinc sulfide concentrate leaching residue was introduced.Ammonia sulfide solution was choosed as extracted liquor,and sulfur in zinc sulfide mineral leaching residue can form polysulfide ions,which will dissolve in the solution.The filtrate was separated out through filtration and the thermal decomposition was carried out.The produced gas was led out and absorbed,which can be used in repetition.Also the decomposition liquid can be prepared into the high-purity sulphur products through thermal decomposition.The formation conditions of polysulfide were as follows:ammonium sulfide solution concentration of 4.0 mol/L;and the ratio of liquid to solid was 11 mL/g;leaching time for 45 min at room temperature.Polysulfide decomposition experiment conditions were:reaction temperature was 353 K and decomposition time was 120 min.Selecting ammonium sulfide solution for leaching sulfur from zinc concentrate leaching residue had many advantages,such as equipment,technology and sulfur extracting operation are simple,do no harm to the environment,and leaching conditions are easy to control,the extract liquid can be returned to recycling,the total sulfur yield can reach over 96%.<BR>

TiO2-active carbon composite material with high photocatalytic activity has been prepared by using nano-sized TiO<SUB>2</SUB> powder and epoxide resin as raw materials.The sample was characterized by thermal gravimetry and differential scanning calorimetry analysis (TG-DSC) and X-ray diffraction (XRD) etc..It demonstrated that the TiO<SUB>2</SUB> in composite existed as anatase.The particle diameter of TiO<SUB>2</SUB>-active carbon composite was 100 nm under scanning electronic microscope (SEM).The experiment of photocatalytic oxidation of methyl orange showed that the composite has a high photocatalytic activity.The research results indicated that,photocatalytic decoloration and mineralization process were taken place simultaneously under experimental conditions.And the composite′s photocatalytic activity was much higher than that of single TiO<SUB>2</SUB> powde for the adsorption of active carbon.The composite not only have a good performance in the ultraviolet region,but also have a very good performance in the visible light region,because of its absorption to visible light (black).So,the low solar energy utilization ratio of TiO<SUB>2</SUB> as photocatalytic catalyst can be significantly improved in the practical application.<BR>

There are many methods to extract boric acid from the boron-containing solutions.The ion exchange method is considered the one of the most promising methods.At present,the ion exchange agents are mostly specific boron ion exchange resins,but their heat-resistant ability is not satisfying.A hydrated cerium dioxide with better heat-resistant ability and larger absorption ability was studied.Its absorption and elution ability of boron in the hot brine was investigated and satisfying result was obtained.

<SPAN lang=EN-US style="FONT-SIZE: 10.5pt; FONT-FAMILY: "Times New Roman"; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">According to different chemical properties of the Cu<SUP>2+ </SUP>and Ni<SUP>2+</SUP> in a certain acid leaching solution of electroplating sludge,the separation experiment of Cu<SUP>2+<SPAN style="mso-spacerun: yes">&nbsp; </SPAN></SUP>and Ni<SUP>2+</SUP></SPAN><SPAN style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-bidi-font-family: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; FONT-FAMILY: "Times New Roman"; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">was studied by ammonia fractional precipitation method,sodium sulfide selective precipitation method,and iron replacement method,respectively.Influences of solution pH,sodium sulfide dosage,and iron dosage on the separation effect were investigated.Then the separation principle of Cu<SUP>2+</SUP></SPAN><SPAN style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-bidi-font-family: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; FONT-FAMILY: "Times New Roman"; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">and Ni<SUP>2+</SUP></SPAN><SPAN style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-bidi-font-family: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; FONT-FAMILY: "Times New Roman"; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体"> was briefly introduced based on solubility product theory and electrochemical theory.Results showed that under appropriate conditions sodium sulfide can selectively precipitate Cu<SUP>2+</SUP></SPAN><SPAN style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-bidi-font-family: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; FONT-FAMILY: "Times New Roman"; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">in the mixture solution and iron can also give priority to replace Cu<SUP>2+</SUP> in the mixture solution so as to achieve separation of Cu<SUP>2+</SUP></SPAN><SPAN style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-bidi-font-family: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; FONT-FAMILY: "Times New Roman"; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">and Ni<SUP>2+</SUP></SPAN><SPAN style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-bidi-font-family: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"></SPAN><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; FONT-FAMILY: "Times New Roman"; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">in acid leaching solution of electroplating sludge.</SPAN>