Disposal of titanium-magnesium production industrial effluents

N. Kulenova, Z. Akhmetvalieva, S. Mamyachenkov, O. S. Anisimova
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Abstract

The results of a study on the disposal of waste discharge at the iron and steel works using centrifugation and vacuum sublimation methods are presented. The object of the study was industrial effluents of titanium-magnesium production. The influence of centrifuge rotation speed, duration, temperature and fraction of solid phase on the process of industrial effluent separation into liquid (fugate) and solid (sediment) phases is studied. A complex of studies based on the multifactor experiment design was carried out to evaluate the effect of each of these factors. Optimum centrifugation parameters were established: rotor speed — 3000 rpm and duration — 30 min. The obtained solution (fugate) contained 195 mg/dm 3 of suspended matter, 26500 mg/dm 3 of chlorides, 39750 mg/dm 3 of dry residue, which indicates its high mineralization and the need for further purification. The expediency of a thermal method of fugate demineralization using a rotary vacuum evaporator was demonstrated in laboratory conditions. Optimum process parameters were determined: temperature 70 ° С , residual pressure — less than 50 mbar, duration — 30 min. Residue yield after vacuum sublimation was 6 % of the fugate weight. No suspended substances were found in the obtained condensate, and chloride content was 50 mg/dm 3 . The proposed technology for the disposal of industrial effluents at titanium-magnesium production will facilitate forming a closed water supply cycle at the enterprise. Residue obtained after the fugate vacuum sublimation containing mainly chlorides of alkali and alkaline earth metals can be recommended to use as an additive for the preparation of anti-ice materials, as well as drilling fluids and kill mud.
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钛镁生产工业废水处理
本文介绍了用离心法和真空升华法处理钢铁企业废水的研究结果。以钛镁生产的工业废水为研究对象。研究了离心机转速、持续时间、温度和固相分数对工业废水分离为液(气)相和固(沉淀物)相过程的影响。在多因素实验设计的基础上进行了一系列研究,以评估每个因素的影响。确定了最佳离心参数:转速为3000转/分,离心时间为30分钟。所得溶液(fugate)中悬浮物含量为195 mg/dm 3,氯化物含量为26500 mg/dm 3,干渣含量为39750 mg/dm 3,矿化度高,需进一步提纯。在实验室条件下验证了旋转真空蒸发器热法脱矿的可行性。确定了最佳工艺参数:温度70°С,残余压力-小于50毫巴,持续时间- 30分钟。真空升华后的残余收率为真空箱重量的6%。所得冷凝液中无悬浮物,氯化物含量为50 mg/dm 3。拟议的钛镁生产工业废水处理技术将有助于在企业形成封闭的供水循环。富格特真空升华后得到的残渣主要含有氯化物和碱土金属,可推荐用作制备防冰材料的添加剂,以及钻井液和压井泥浆。
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