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在氧化铜矿的氨浸湿法冶金中,氨浸出液组分复杂多变,过去采用重量法分析硫酸根,需要时间很长满足不了生产的需要。黎兰馨等提出了用硝酸铅-EDTA间接测定硫酸根,以二甲酚橙为指示剂。该法是为水质分析而制定的.为了适应氨浸液中硫酸根的分析,我们在该法的基础上,增加干扰元素的项目和数量进行了试验。本文报告了干扰元素的限量,以及对滴定终点有影响的干扰离子的消除方法.铜(Ⅱ)50毫克、钴(Ⅱ)5毫克、镍(Ⅱ)10毫克、锰(Ⅱ)5毫克、铝(Ⅲ)30毫克、钙(ⅡI)30毫克、镁(Ⅲ)30毫克、砷(Ⅲ)7毫克、氯离子100毫克无干扰.大量铁(Ⅲ)可用氢氧化铵预先分离.砷酸根在2毫克以下,可用氢氧化铁共沉淀分离。微量铁铝在滴定前加氟化钾和抗坏血酸联合掩蔽,可消除其对终点的影响.本文提出的方法操作简便,分析时间仅一小时左右,可靠性和重量法一致,相对误差在1%左右. 试剂硫酸根标准溶液用硫酸钠按理论量配成1毫升等于2毫克的溶液,并用重量法标化;
Ammonia leaching hydrometallurgy in copper oxide, ammonia leachate composition is complicated and changeable, the past analysis of sulfate by gravimetric method, takes a long time can not meet the needs of production. Li Lanxin et al proposed the use of lead nitrate-EDTA indirect determination of sulfate, xylenol orange as an indicator. The method was developed for the analysis of water quality.In order to adapt to the analysis of sulphate in ammonia leaching solution, we conducted experiments on the basis of this law by adding items and quantities of interfering elements. This article reports the limits of interfering elements and the method of eliminating interfering ions that affect the endpoint of the titration. Copper (II) 50 mg, Cobalt (II) 5 mg, Nickel (II) 10 mg, Manganese (Ⅲ), 30 mg of calcium (Ⅱ I), 30 mg of magnesium (Ⅲ), 7 mg of arsenic (Ⅲ) and 100 mg of chloride ion.A large amount of iron (Ⅲ) Milligrams, available iron hydroxide co-precipitation separation. Trace iron and aluminum before the titration plus potassium fluoride and ascorbic acid combined masking, can eliminate the impact on the end point.The method proposed in this paper is simple and convenient, the analysis time is only about one hour, the reliability and weight are consistent, the relative error is about 1% Reagent sulfate standard solution with sodium sulfate according to the theoretical amount of 1 ml is equal to 2 mg of solution and weight method;