A method for resourceful treatment and comprehensive recycling of electroplating sludge

Abstract

The invention discloses an electroplating-sludge resourceful treatment and comprehensive recycling method. The method mainly includes the steps of pretreatment, acid leaching, copper extracting, nickel and cobalt extracting, chrome taking through precipitating, precipitated zinc neutralizing, manganese taking through adsorbing and sodium salt recycling. According to the method, under the condition of the low pH value, valuable metal such as copper, nickel, cobalt, chrome, zinc, manganese and the like is effectively and sequentially recycled, chrome is deeply removed through one-time chrome precipitating and magnetic fluid flawing growing with a phosphoric acid method, virose hexavalent chromium is not produced in the period, and therefore the chrome is produced in a high-value-added chemical product manner and becomes available resources. After being treated, waste water can be discharged outwards or reused when meeting the national standard, resourceful-and-innocent treatment and comprehensive recycling of electroplating sludge are achieved accordingly, the technological process is short, the adaptability of raw materials is high, and the metal recovery percent can be higher than 90%. In this way, the comprehensive process cost is markedly reduced, and economic benefits and social benefits are obvious.

Description

technical field [0001] The invention relates to a treatment method of electroplating sludge, in particular to a method for resourceful treatment and comprehensive recycling of electroplating sludge. Background technique [0002] The electroplating industry is an indispensable basic industry in the national economy, and it is also one of the three major polluting industries in the world today. The solid waste generated by the electroplating industry is mainly electroplating sludge, which is listed as hazardous waste because of its high mass fraction of heavy metals , In recent years, the number of electroplating enterprises in my country has grown rapidly, and most of the electroplating enterprises are small in scale, outdated in equipment, and low in management level, resulting in a large amount of sludge with complex components, and the disposal methods and resource technology of electroplating sludge. Research has become one of the urgent problems to be solved in our country...

AI Technical Summary

Problems solved by technology

(2) The state controls hexavalent chromium very strictly, and it is difficult to pass the state and government approval in the feasibility study report and environmental impact assessment report

(3) The process is too long, the pH value is increased in stages, iron, nickel, copper, zinc, magnesium and other metals are precipitated and filtered in sequence, and 6 to 8 times of filtration and washing are required, so it is difficult to ensure that the human body does not touch during the production process Hexavalent chromium, there is production safety

(4) The material contains organic matter such as flocculants and brighteners, which will greatly consume oxidants, thereby increasing the amount of oxidants

(2) NH 3 When the concentration is greater than 18%, ammonia is easy to volatilize, which not only causes the loss of ammonia, but also affects the operating environment, so the requirements for the sealing of the device are relatively high

[0011] There are limitations in the above three methods for treating chromium, and it is impossible to achieve large-scale and continuous production automation. Therefore, new ideas and processes are needed to treat electroplating sludge

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