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Stage grinding method for steel slag and industrial by-product gypsum composite powder

A technology of by-products and composite powder, which is applied in the fields of solid waste removal and grain treatment, can solve problems such as easy adhesion to grinding equipment, high iron content in steel slag, and difficulty in grinding, so as to improve the usable value and ratio The effect of high surface area and low moisture content

Active Publication Date: 2020-01-21
QIANAN WEISHENG SOLID WASTE ENVIRONMENTAL PROTECTION IND CO LTD +1
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Problems solved by technology

[0008] For this reason, an object of the present invention is to propose a stage grinding method of steel slag-industrial by-product gypsum composite powder to solve the problem of high iron content in steel slag and difficulty in grinding, and the industrial by-product gypsum is easy to adhere to grinding alone Grinding equipment, easy over-grinding, and easy agglomeration

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  • Stage grinding method for steel slag and industrial by-product gypsum composite powder

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Embodiment Construction

[0029] The technical solutions in the embodiments of the present invention will be described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0030] The invention provides a steel slag-industrial by-product gypsum composite powder stage grinding method that uses pre-iron removal, two-stage crushing and two-stage grinding to realize the grinding of steel slag and industrial by-product gypsum, achieving steel slag and industrial by-product gypsum The co-utilization of the two types of industrial solid waste is implemented as follows:

[0031] First, after feeding and weighing the large steel slag with a maximum particle size of about 100mm, the large steel slag is pre-...

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Abstract

The invention discloses a stage grinding method for steel slag and industrial by-product gypsum composite powder. Through iron removal in advance, large-particle metallic iron in large-piece steel slag is removed, and the conditions that the large-particle iron enters a crusher and the crushing efficiency is affected are avoided; two-stage crushing is combined with sorting as well as iron removal,so that the problem that the circulation load of a pipe mill is increased if a large amount of metal iron with the poor grinding performance enters the mill is solved; during second-stage grinding, industrial by-product gypsum and the steel slag are mixed and ground, the condition that the industrial by-product gypsum is prone to adhering to equipment, is prone to being excessively ground and isprone to agglomerating during single grinding is avoided, materials are effectively mixed to obtain the steel slag and industrial by-product gypsum composite powder with the low iron content, the highspecific surface area and the low water content, and the coordinated utilization of two industrial solid wastes including the steel slag and the industrial by-product gypsum is promoted.

Description

Technical field [0001] The invention relates to the technical field of comprehensive utilization of industrial solid wastes, and more specifically to a staged grinding method of steel slag-industrial by-product gypsum composite powder. Background technique [0002] Steel slag can be used in concrete, cement, water-stable layer in highway construction, etc. The technical barriers to the utilization of steel slag are: the iron content in steel slag is high, and a single grinding method is not only difficult to achieve the particle size required for large-scale utilization, but also has high grinding energy consumption. Comprehensive utilization of iron removal and stage grinding methods can not only reduce energy consumption. At the same time, fine-grained steel slag powder can be obtained. [0003] The composition of industrial by-product gypsum is the same as natural gypsum, namely calcium sulfate dihydrate. Because it contains a large number of sulfate radicals, it can stimulate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00B02C23/08
CPCB02C23/08B09B3/00
Inventor 巴浩静倪文吴伟王玉峰蔡水生汪坤杜惠惠李颖王雪
Owner QIANAN WEISHENG SOLID WASTE ENVIRONMENTAL PROTECTION IND CO LTD
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