Process for producing a particulate recyclate from quartz composite
A process for producing a particulate recyclate from quartz composite by comminuting quartz composite moldings composed of a polymer matrix with inorganic and/or organic filler particles embedded therein, wherein precomminuted pieces of molding are comminuted in a hammer mill to form particles that form the recyclate.
1 . A process for producing a particulate recyclate from quartz composite, comprising the steps of: comminuting quartz composite moldings composed of a polymer matrix with inorganic and/or organic filler particles embedded therein, in which precomminuted pieces of molding are comminuted in a hammer mill to form particles that form the recyclate; removing a first particle fraction, using a sieve, having a maximum grain size greater than a target grain size of the particles that form the recyclate from the hammer mill; and then, in a downstream sieving device, removing, from the first particle fraction, a second particle fraction containing particles having a grain size equal to or less than the target grain size that form the recyclate and separating out a third particle fraction containing particles larger than the target grain size.
2 . The process according to claim 1 , wherein a sieve is used to remove a particle fraction comprising particles having a maximum target grain size that form the recyclate.
3 . The process according to claim 2 , wherein the target grain size is 1.0 mm.
4 . The process according to claim 1 , wherein the maximum grain size is 5 mm.
5 . The process according to claim 1 , wherein the sieve for obtaining the first particle fraction is a bar sieve.
6 . The process according to claim 1 , wherein the target grain size is 1.0 mm.
7 . The process according to claim 1 , wherein the third particle fraction is returned to the hammer mill for further comminution.
8 . The process according to claim 1 , wherein the particles of the first particle fraction that are comminuted in the hammer mill are transferred to the sieving device and/or the particles of the third particle fraction from the sieving device are returned to the hammer mill manually or via a transport device.
9 . The process according to claim 1 , wherein, in the sieving device or a further sieving device, a fourth particle fraction having a maximum grain size less than the target grain size is formed from the second particle fraction by sieving and removed, so as to leave a fifth particle fraction containing the particles forming the recyclate which is removed.
10 . The process according to claim 9 , wherein the maximum grain size of the fourth particle fraction is 0.1 mm.
11 . The process according to claim 1 , wherein sieving of the first particle fraction and/or sieving of the second particle fraction is accomplished by using a mesh sieve in each case.
12 . The process according to claim 1 , wherein molding pieces comprising inorganic and/or filler particles embedded in a polymer matrix with a proportion of ≥60% by weight are used.
13 . The process according to claim 1 , wherein the precomminuted molding pieces have a maximum length of 40 cm.
14 . The process according to claim 1 , wherein the moldings for are formation of the molding pieces comminuted manually or by means of a comminution apparatus.
15 . The process according to claim 1 , wherein the molding pieces are fed to the hammer mill manually or by means of a transport device.
16 . The process according to claim 1 , wherein the moldings used are sinks.
17 . The process according to claim 2 , wherein the target grain size is 0.8 mm.