Material utilization method for electroplating sludge

Abstract

The invention provides a material utilization method for electroplating sludge. The method comprises the following steps: (1) pretreatment; (2) preparation of a gypsum material; (3) preparation of a clinker; and (4) preparation of an ultrafine gypsum filling material or anhydrite gelling material. According to the invention, a sulfuric acid leaching method and a biological leaching method belonging to mature wet processes are employed for pretreatment and separation of heavy metals in electroplating sludge, and lime or limestone is used for neutralization, so most valuable metals or heavy metals can be recovered at low cost for preparation of corresponding metal or metal salt materials, high-purity metal or metal salt materials or raw materials can be easily obtained, and waste sludge residues with dihydrate gypsum as a main mineral, i.e., a usable gypsum-based resource, can be easily obtained; and waste residues of electroplating sludge are not discharged, so environmental pollution and hidden troubles caused by the waste residues are thoroughly eliminated and environmental protection is benefited.

Description

technical field [0001] The invention relates to the field of environmental protection and waste utilization, in particular to a material utilization method of electroplating sludge. Background technique [0002] The electroplating industry is one of the three major polluting industries in the world today, and it is also an important basic processing industry in my country. The electroplating sludge generated during the electroplating process enriches almost all the elements in the electroplating wastewater, including harmful heavy metals, and the conventional compound components in the electroplating sludge Mainly include: CaO, SO 3 、Al 2 o 3 , Fe 2 o 3 , CuO , NiO, ZnO, CdO, CrO, SiO 2 、Na 2 O, MgO, Co 2 o 4 , SrO, Nb 2 o 5 , ZrO 2 , PbO, HgO, etc. and some anions, among which copper, nickel, chromium and other heavy metals are mainly hydroxide precipitates. Most electroplating sludge mainly contains chromium, iron, nickel, copper, zinc and other heavy meta...

AI Technical Summary

Problems solved by technology

[0031] In summary, although the resource utilization of electroplating sludge has always been a research hotspot at home and abroad, many scientific research institutions and enterprises have conducted a lot of research on the recycling of valuable metals in electroplating sludge and the harmless resource treatment. However, most of them are in the laboratory stage or demonstration. Although there are relatively mature wet process (hydrometallurgy) and thermochemical (pyrometallurgy) valuable metal recovery technologies, the process of fully recovering valuable metals in electroplating sludge Technically, there are still problems such as high cost, complicated operation, and low purity of the recovered products, and the processing volume is small, the cost is high, and there are problems of ultimate disposal of sludge and waste residue or secondary pollution, resulting in electroplating, one of the three major pollution sources in the world. The problem of industrial pollution has not been solved. For this reason, there is an urgent need for a method that can use electroplating sludge as a raw material, which can not only use existing mature methods, but also extract most of the valuable metals economically, and recycle the electroplating sludge. A New Method of Materialization of All Components of Mud